I have a funny story about the Marantz I got in the garbage that is a little newer than this. It was completely dead, no power. It had a tag on it from a repair shop. Apparently there was a TSB that Marantz released for a diode going bad in the power supply. The fix was simply to clip out the diode and replace it with a jumper. It went to a Marantz authorized service center for that repair. I took it apart to check it out, and it turns out that the shop reassembled it incorrectly, and one of the pin headers that connect the boards together was off by 1 pin. I put it back together, works perfect.
@bgray1009
5 жыл бұрын
great video, whether they can be repaired or not it is still a great learning and enjoyable experience for us, love the videos keep them coming. Regards from Bonnie Scotland
@pierluigicroci4692
4 жыл бұрын
Good morning 12voltvids I am very surprised at his skill in finding faults and repairing them very efficiently, I downloaded many of his videos, and I was amazed at the memory he has in inserting all the pieces in their place without advancing anything, including screws. His videos are very descriptive although I don't understand anything about English, I just talk about the video part by themselves. He is also very meticulous in showing all the various steps of dismantling and editing, despite electronics I do not understand much, indeed nothing, but it fascinates me to see his painstaking work. Congratulations on everything and you always keep it that way.
@Lapeerphoto
5 жыл бұрын
*Not only seeing something taken apart. But more importantly, to me, is your troubleshooting process for determining the cause. Speaking for myself, with limited electronics repair knowledge, I can troubleshoot, but not often efficiently or accurately. :) Thanks!
@antraciet
5 жыл бұрын
David: same for me, that is why i am here to learn from people like 12voltvids.
@davidhamm5626
5 жыл бұрын
Yes good troubleshooting is important. ppI learn something every time i watch.
@NunYa953
5 жыл бұрын
Make sure to tip the man! The amount of money I've not only saved but made by being able to repair and flip electronics has been staggering. I didn't realize it until I got the fucking tax bill!
@JohnGotts
5 жыл бұрын
I love my Harmon/Kardon AVR-50. I bought it from Fry's in Silicon Valley back in the summer of 1997. It was a refurbished unit manufactured in 1994 or 1995. Still works perfectly to this very day. I have never opened it. Finally, after 24 years, the display is slightly dim but still acceptable. This unit bears a striking similarity.
@abc-ni9uw
5 жыл бұрын
I've got a pioneer sa-9800 from 1980 and it still works beautifully. 25 years used only with headphones. The rest by myself. It's a truly magical amplifier. 4 yes four 15000uF power capacitors and it's a dual mono block design. With original box
@joblo4216
5 жыл бұрын
make sure you keep that puppy
@jeromewysocki8809
5 жыл бұрын
My favorite receiver is one I built myself as a kit. It is a Heathkit AR-1500 that cost me about $400 (1973 money) back then. It took me 10 evenings to build it, taking my time. It was designed such that the builder could do basic diagnostic trouble shooting using test leads and the actual signal strength meter, built in to the receiver. Basically, you compare meter readings on multiple test points on the various circuit boards, comparing your results to those in the assembly manual. The set worked perfectly since day one. 90 watts, rms per channel, they claim. Sounds superb. Only maintenance was to clean out dust every 10 years. If you can find one of these beasts on eBay, and it was not abused, get it. It will not disappoint!
@DrewskisBrews
5 жыл бұрын
I fixed my in-laws late 90's Sony (2- channel) reciever last winter. Discrete components on the power amplifiers, removable bottom. I fixed it (bad speaker protection relay) , and told them they needed to hang onto it, because they are not built like that any more. Unfortunately, it suffers from 2 general deficiencies: solder joints have not enough solder, and some of the intermediate power transistors are driven really hard, and get hot enough to roast the board (at least need bigger heatsinks) Still working a year later, though
@DrewskisBrews
5 жыл бұрын
Correction: the power amplifier driver transistors have no heat sinks at all
@69eddieD
5 жыл бұрын
@@DrewskisBrews That is the weak link of Sony power amplifiers of that vintage. The driver transistors get so hot that they eventually work themselves loose from the board and this results in sudden catastrophic failure. I speak from experience. They desolder themselves from the board. Best thing you can do is reflow the solder and add a little bit of solder, and then keep an eye on it. Maybe you can fit small clip on heat sinks, but be careful you don't short anything out.
@DrewskisBrews
5 жыл бұрын
@@69eddieD I did reflow them. I wanted to add heatsinks, but the transistor case style requires a small clip-on type, and I couldn't find any in my collection
@bryanbergman4241
3 жыл бұрын
What do you think of late 90s Marantz Receivers? I'm supposed to look at a used one soon, and the guy doesn't have speakers and promises it works
@DrewskisBrews
3 жыл бұрын
@@bryanbergman4241 are you [potentially] buying it, or checking it out for the owner, or some other buyer? I don't have any experience with these, but the same kind of things always apply, and you can tell a lot without even using test equipment. Being able connect speakers, or headphones if you have no other options is kind of a must. Scratchy/noisy controls are pretty common on just about anything, depending on what kind of use and environment it has seen.
@DrCassette
5 жыл бұрын
Audio equipment without removable bottom panels is really a pain to work on... I had the entry-level stereo only version of this series of Marantz receivers. Not very good. Lots of noise in the phono preamp and the tuner was very insensitive so I could never get good reception of FM stations. A few years after I got it the rotary encoder for the volume control went bad. Thankfully I was able to fix that. I ended up selling the receiver.
@user-ee4ts8qx3q
5 жыл бұрын
Отлично работает..такой же..до сих пор..без ремонта
@Jojo-qb5sp
5 жыл бұрын
9:43 What's going on in the top right corner? I see melted solder/flux.
@dhpbear2
5 жыл бұрын
That 'motherboard' design reminds me of the Southwest Technical Products Preamp (1975). They employed Molex power connectors for signal and power to the daughter boards! The daughter boards were op-amps built with discrete transistors.
@robertroskopf8483
3 жыл бұрын
I’m all for removable bottom covers. The only thing bad about them is that it’s possible to loose them if a repair drags on, possibly getting passed around to multiple techs, even a large cover can get lost. In my early 20s, when they started making unit without removable bottom covers; I got so frustrated with one that I took the dremel tool and cut the bottom. The shop I fixed the unit for wasn’t pleased, but they still had me fix stuff for them. What is so costly about a few extra screws, or even a cutout where I can add my own screws after a repair (?) I enjoy you videos, thank you.
@int53185
4 жыл бұрын
I had a Onkyo surround sound receiver with a BGA main chip with no heat sink on it. After a few years (warranty expired) the solder cracked and the receiver went intermittent. I re flowed the solder with a heat gun and glued a heat sink to the chip. 2 years later it's still working. They must have saved 15 cents not installing that heat sink.
@RegiPavan
5 жыл бұрын
I have a dead pioneer multichannel receiver that has power all over the connections, stand by lights up, but will never turn on. Technician told me it has an issue with the microprocessor, and that's where the road ends for most of these crappy digital receivers... Thanks for the video, please keep sharing even if it's not a succesfull fix... Thanks!
@12voltvids
5 жыл бұрын
When the micro goes bad it is time to move on.
@antraciet
5 жыл бұрын
Regi: months ago i bought a Pioneer VSX450; i thought i could repair it in 5 minutes. But the same crap as in the vid: not service-friendly. At least on the Marantz there are connectors: on the Pioneer is everything soldered. And at the end i did more damage: end of the story, like 12voltvids says: time to move on but i will never buy something defective anymore with a display, or younger then the eighties, is not worth repairing for a hobbyist like me.
@12voltvids
5 жыл бұрын
@@voltare2amstereo I did this first before and after resoldering that regulator. A/D u +dimmer.
@RegiPavan
5 жыл бұрын
@@antraciet That's not worth the trouble, I would rather expend my time changing caps and transistors, instead of messing with digital.
@Dillisive
5 жыл бұрын
I'm glad I found your channel. Its not only interesting but its informative. I never repaired anything in my life. But its good to watch just in case I get a hold of something I actually want to keep.Like a S-VHS VCR or a Minidisk deck ( which I already have,Still working) . You have a subscriber for life.
@12voltvids
5 жыл бұрын
There are a few of us still working on electronics Many work only on the vintage stuff because it is easier to work on. Most of the modern stuff is very difficult if not impossible to work on these days.
@pvb9964
5 жыл бұрын
early 80's Akai....awesome amps with the pulsed power supplies. Clean and stable sound with excellent dynamic range.
@Starphot
5 жыл бұрын
When I last repaired these similar units in 2001, these failed out of the box. I went to the regulator clusters and resoldered the connections as some of these failures were visible. That usually cured the problem. It had to do with the wave soldering problems, decreased QC on the factory floors and going to China. The regulators were heat-sinked and were prone to cold solder joints if these boards went through the wave solder process too quickly. The clocks on the micros had RC, resonator or quartz crystals attached to them. Some of these micros had a clock enable pin on them. Certain power supply failures would disable the clock on some of these.
@MustermannAnybody
5 жыл бұрын
This was interesting even though it was a no-fix. Learned something, thanks for uploading.
@12voltvids
5 жыл бұрын
I showed it mainly to show where a problem area is, those regulators. Likely connections on the regulators failed and caused voltage surge that popped the CPU.
@umajunkcollector
5 жыл бұрын
Beats Consumer Reports bull, this is real world, why to avoid buying crap because...
@jime386
5 жыл бұрын
I once ...1978.... paid a buttload of money for a Marantz 4400.Coulda bought a car. The thing was AWESOME. Hooked up to pair of Klipsch Heresy speaks. A whole can of Coca Cola was poured in it. Knocked out the AM section. The rest lived. Superscope did not have time to kill Marantz yet
@danvanlandingham3854
5 жыл бұрын
I've never seen a repair job yet where the customer told the tech that money was no object:I repaired TVs for years until 1990.They wanted a working TV for next to nothing.More like a set that worked like new for around $10 or less.I did it off and on for about twenty years.
@12voltvids
5 жыл бұрын
I have a lux a3400 preamp that will be costing the owner a pretty penny. I am working on that now, and it started it's life in 1973 as a kit that looks like a jr high school student assembled as his first project. Wait for it, you will get a good laugh. You won't laugh when I tell you the guy paid almost a grand for this piece of junk that he will be paying me dearly to fix.
@12voltvids
5 жыл бұрын
Its no different today. I get people say if you can fix it for 50 or less go ahead, otherwise toss it.
@7ngaf
4 жыл бұрын
I enjoy seeing you take things apart and the guts of the system but mostly when you fix the problem
@FeCr3
5 жыл бұрын
That's a reason why i still use my 25-30 year old stereo equipment. Needs just cleaning from time to time thats all....
@12voltvids
5 жыл бұрын
The old stuff keeps on going, and is easy to service because it is not microprocessor controlled.
@minuteman2012
5 жыл бұрын
I'm running a fisher 800c right now.....early 60s....all tubes.....
@12voltvids
5 жыл бұрын
@DataStorm WHen it takes 2 people to lift your amp, you know you got a good one.
@thomasnew8606
5 жыл бұрын
agreed - I use a Denon AVR 3805 (from 2005 no HDMI) for my media room and works great and 2 Denon DRA825 and 1 Denon DRA 545 stereo units for the remaining speakers. They all sound great and I enjoy your channel ! I have a few older Denon cd players in use because of your older fixes
@wendellporter4875
5 жыл бұрын
I have a all tube 1965 pioneer sx-800
@vrvretro
5 жыл бұрын
Yes I agree, this was a good one. Component we are more likely to see these days.
@DeadKoby
5 жыл бұрын
I got an Onkyo into my shop... I found the problem, but it was such a nightmare to remove the board, the price would be ugly to fix it.
@waltschannel7465
5 жыл бұрын
On some of the Onkyo units, there is a manufacturers extended warranty as the result of a settlement Onkyo reached several years ago. Not sure if it's still in force or not.
@int53185
5 жыл бұрын
@@waltschannel7465 It was only on the high end models. Re flow the solder on the main chip and install a heatsink on it for a permanent fix.
@Oufg103f
5 жыл бұрын
great video, don't have to fix everything to make it a good video. keep it up!
@THEtechknight
5 жыл бұрын
Yep. Gotta know when to walk away. I have seen weird instances on these newer microprocessor software controlled monstrosities where the CPU is still good, but a glitch triggered the internal flash erase. and poof. braindead. For my own learning curiosity, I did some differential power analysis on the CPU to see if it was looking at and running any instructions, it would sit in an infinite loop and halt, as if the FLASH is corrupt or blank. I had a JVC one time that the ROM had suffered some sort of bitrot internally, I could use the wet finger trick and "clock glitch" the CPU and it would run again! until the next reboot/power cycle.
@Chupacabras222
5 жыл бұрын
It's very kind that customer didn't bother you with that non-relevant stuff about 240V in the beginning...
@seabee460
5 жыл бұрын
People do this to me all the time. I can do less troubleshooting with the correct info the first time!
@kozkoz7776
5 жыл бұрын
That was an honest to goodness video I'm glad you called it as you sees it GOOD ON YOU some things are not worth saving PS I too own Harmon Kardon and I fixed mine it was the circuit in behind the volume knob I JUST GOT LUCKY
@whathahk
3 жыл бұрын
Agree with Chris and Barry. It is great to see the good the bad and the ugly!
@EastAngliaUK
5 жыл бұрын
surprised its not good the transformer is big I just bought 2 amps from ebay lucky they work OK but they are from 2011 they are pioneer sc-lx73 & yamaha rx-v2065 the yamaha rx-v2065 runs the coolest which I think is the one will have to use when the room gets to hot.
@WooferCooker
Жыл бұрын
The fuses are always good
@iLLusiveMan82
5 жыл бұрын
Hi, I was just wondering what role does that big copper plate have? (The one that is around the main transformer) Is it shielding from EMI or something else?
@12voltvids
5 жыл бұрын
Probably to reduce induction from getting into other circuits
@soumitradas7785
5 жыл бұрын
Is this kind of chip replaceable? I had same problm in my pioneer receiver. I bought chips from ebay but it didnt work.
@TECHNDJ
4 жыл бұрын
What model avr?
@arindamdas936
3 жыл бұрын
If you are talking about the microcontroller than yes it is replaceable but no point just buying the physical chip as it would not have the firmware without which it’s pretty much useless.
@larrypierce2777
5 жыл бұрын
I loved the Marantz I had in the seventies. Such great sound. I guess that chip would've cost a pretty penny plus the trouble of installing it. Do you keep the Unit for parts or do you send it to salvage?
@DhakaMusicOmar
4 ай бұрын
hello brother, I have an issue on a technics svi 3205 , 4.2 millivolts on one channel, all the parts are hopefully okay , what do I do now to get rid of the 4.2 millivolts, and the sound is also a bit distorted at high volume
@mrmoon7484
5 жыл бұрын
Please tell me what is your soldering iron power (watt)?. Mine is 60 watt but it is not enough for me. should i use higher wattage iron?
@WorkinDuck
5 жыл бұрын
60 watts is plenty for 90% of electronics. What kind of work do you want to do and what iron are you using right now?
@mrmoon7484
5 жыл бұрын
@@WorkinDuck hi I do not think my iron has 60 watt full power (as rated). because it is non brand chinese $5 crap. I should upgrade it with a reputable brand
@ytSuns26
5 жыл бұрын
I have always said engineers should have to work on there designs, before they build the damn things!
@1pcfred
5 жыл бұрын
I had an old Marantz quadrophonic receiver I blew a power transistor in. The way it was put together I just scrapped the whole unit for parts. Those transistors were buried right in the middle of it. It wasn't a great stereo in the first place.
@whodatdere1
5 жыл бұрын
This is why I hate working on most consumer electronics and try to stick with industrial stuff when I can.. Most customers don't know or understand how a solid half hour can easily be burned up just by disassembly and reassembly long before any actual work is completed on the unit.
5 жыл бұрын
Can I request a video about what kind of scope to buy in today's market that is fully functional, not too expensive, but a good quality unit mid range ?
@HABS1HABS1
5 жыл бұрын
Like you're videos . Santa get you a cordless screwdriver?
@12voltvids
5 жыл бұрын
I was sent that to review months ago. Came with a 240v charger cord.
@THEtechknight
5 жыл бұрын
240V? Yeap... pretty much tell where that came from....
@12voltvids
5 жыл бұрын
@@THEtechknight Shipped the wrong version, has a UK plug on it.
@swinde
5 жыл бұрын
14:26 I normally remove the old solder with a wick or pump before applying new solder. The solder flows much better and makes a stronger joint.
@NunYa953
5 жыл бұрын
Just saw a.pristine one of these at Goodwill today. Half price Saturday! Could've bought it for $12.50.
@lloydparks4974
5 жыл бұрын
Dave id like to see all your videos of stuff that you tried to fix and didn't post ! all though you wouldn't have many....lol I think we all learn from things you fix and even if you cant fix be it cost to a customer or maybe its not worth fixing its all good . thank you keep em coming :))
@station240
5 жыл бұрын
Had much the same issues with a Onkyo TX-DS787 and more. Such a nightmare to dismantle to work on, same PCB mass, same exact transformer. I had to physically rip wires out of connectors to dismantle it, they had run short wires into quick release connectors that take bare wires, and there was no way to get in to release the wires. When you have to replace wire and connectors just to reassemble something, it's a bad design. Having actually release the mainboard for the amplifier, I found it had quite a few burn marks where components had been running hot. Also the 4 main capacitors had gotten hot enough to cause the outer sleeve to move and distort. The good points about the DS787 ? Well you can salvage the rotary encoders, transformer, aux supply, casing, rear binding posts and ducted heatsink for other projects. The amp/preamp is complete junk, the rest is either project parts or valuable scrap metal.
@expiridionrodriguez8618
4 жыл бұрын
My Marantz SR8000 5.1 Channel 105 Watt Surround Home Theater Receiver is on but don't have sound. Can you tell me what is wrong?
@CW-pu4yb
5 жыл бұрын
Nice soldering...just like me, waiting for the tip to heat up with it touching the part. Yeah the surge could gave smoked any random small component or internal circuit. Time to upgrade to 4k.
@12voltvids
5 жыл бұрын
This doesn't even support HDMI, just Svideo. Pretty old.
@SingapuraTreasure
5 жыл бұрын
you are the best. always enjoy watching all your vids
@amazoidal
5 жыл бұрын
The RCA jacks are mounted on the boards. Big problem potential.
@amazoidal
3 жыл бұрын
I have had many break off and had to replace them with jacks that mount on the panel. Parts Express has great jacks. You may have to drill a hole in the panel. And you need soldering skills. But they won't break off again.
@robertgaines-tulsa
5 жыл бұрын
I've lost interest in surround sound systems. I bought an RCA Dolby Digital system that had a DVD player in it some years back, and the thing only worked for one year. I went back to using the RCA integrated stereo amplifier that I've had since the early 2000s. I am still using that. The stupid chips they put in these complex electronics aren't worth dirt!
@PhuckHue2
5 жыл бұрын
the disassembly wasn't bad. I had to replace a leaky capacitor on an Onkyo and it was like a jigsaw puzzle. It took me all day
@michaelturner4457
5 жыл бұрын
So unlike that Weller soldering station, 240V didn't blow-up the transformer in this?
@12voltvids
5 жыл бұрын
Apparantly not. Going by what owner said. Was working power went out in wind storm. Power returned some appliances blown and stereo dead.
@zx8401ztv
5 жыл бұрын
I've always thought that all power supply circuits should be on a seperate board. I like the trapdoor designs as well, it just makes sense.
@swinde
4 жыл бұрын
Back in the day, anything with a Marantz logo had a construction style that resembled Mil-Spec quality. They maintained this into the early 1970s, then fell into the "manufacture cheap", screw serviceability that the majority of companies do today. An excellent era has ended with very few companies making their equipment serviceable.
@12voltvids
4 жыл бұрын
When Marantz was built by Saul Marantz in Kew Gardens New York they were top notch. Not these days. It is just a name now.
@terryduncan5718
Жыл бұрын
My Marantz 4270 quad receiver is built like a tank..bought it in 75...still.plays fine..
@rollyavecilla
10 ай бұрын
Hello. I admire your patience. Let me ask you, I have Marantz SR73, it becomes mute on its own for a few seconds. All control is working it is just that no sound is coming out of the speakers. Sometimes after a few seconds sounds come back, and sometimes it doesn't until the next day. Where should I start looking?
@12voltvids
10 ай бұрын
No idea
@rollyavecilla
10 ай бұрын
Alright, thank you.
@faithless8888
5 жыл бұрын
You would think that a brand like Marantz would let there equipment to be much more easily be serviceable. I think it's a shame they don't even find the 'budget' to install a hatch on the bottom of the unit... :-/ anyway, nice video! I learn a lot from you! :-)
@12voltvids
5 жыл бұрын
When they were made in the states yes. Even japan, but these were made in china where they made them as cheap as possible.
@Loganlion42
5 жыл бұрын
When you had the board upside down re-soldering the power converters look to the right at the giant ark path that is shorting to circuits together bet that is the problem can be seen at 11:35
@DrCassette
5 жыл бұрын
Are you sure? An arc path would be burnt black, all I can see is what looks like flux residue from the production of the board.
@AThreeDogNight
5 жыл бұрын
I have watched that several times, that's the lighting from where he presses down on the board & moving his hand shows a little light right there, or that is what it looks like to me.
@Loganlion42
5 жыл бұрын
@@DrCassette On my screen it appeared to have a thin black line but perhaps that is just the lighting
@TheFlyingBusman
5 жыл бұрын
I spotted this one too. Pretty damned obvious. Why he chose not to look there is beyond me. There’s a good chance it’s spiked a few other more sensitive components though so this thing was probably going to be toast anyhow. Had an old Technics receiver do pretty much the same. Took out the processor so became bin fodder.
@TheFlyingBusman
5 жыл бұрын
Once over, Marantz did some very nice gear. Still have a CD 63 mk2 KI signature and besides a new laser it has been a fantastic CD player. Newer stuff far less impressive. They do not build units to be worked on, they do not want you to work on it, they want you to buy a new one. Poor design but then that could apply to any number of modern electronic devices.
@johnb5519
5 жыл бұрын
Really thought you had it fixed after finding those bad connections. It seems any time I have something that is not working, I never find any bad connections.
@12voltvids
5 жыл бұрын
Me too. Thought it would fire right up after finding those, but nooooo more problems.
@russellhltn1396
5 жыл бұрын
Given that it was hit by 240V, I'd think it would be a supply cap or the regulator itself I wouldn't think it would get downstream of the regulator. I assume you checked that the output voltage was correct and no ripple. The input voltage seems a bit low for a 7805. I wonder if a rectifier diode went. The ripple is keeping the cpu reset.
@Inflec
4 жыл бұрын
As you stated at the start of the video, you were under limits from the owner of this thing. Had he been more generous though I would have tried new components in that clock circuit. I have seen crystals go flaky about starting up and the caps that usually are on both legs sometimes go bad in unusual ways--neither shorting or going open (the Q degrading I think). Many years ago I used to repair Atari home game consoles and this problem would sometimes occur with their CPU clocks. The fix was to replace the caps on the xtal with different types which were polystyrene if memory serves.
@LifeBeginsAtForty
2 жыл бұрын
If shorted at amplifier module, the display also unable to turn-on.
@tacticalAV
5 жыл бұрын
Wonderful great video, I wish more were like this... is that marantz a class AB circuit topology? Looks to be class D SMPS...
@mrman7453
Жыл бұрын
A doctor works on 2 types bodies. A master mechanic work on them all
@joeldoxtator9804
5 жыл бұрын
This is why I use separates for multi-channel. Get good serviceable amps then buy throw away processors with the required channel count and outputs. Edit: Looked up the SR5300.... 2003 line-up, I'd say he got his monies worth from the device.
@davidnguyen5028
2 жыл бұрын
Too bad for me, I have the same unit and the same problem, I would have liked to see you fix it or at least find out what the problem was.
@bishoppolycarp9684
4 жыл бұрын
I have a Marantz SR4300. It goes into standby when the volume is turned up a little, like -25. Any clues?
@umajunkcollector
5 жыл бұрын
I got the same Marantz at a junk store for 20$, works fine, but not like "MARANTZ" when they were good stuff. Is there some connection with Sony? I like the "fail vids", the information is important in making decisions. Someone may scrap a good unit over a blown fuse. This is about when it is OK to scrap crap, if it goes beyond fuses, connections or old caps.
@PileOfEmptyTapes
5 жыл бұрын
Not surprised standby power checked out OK. If the standby xfmr has survived, the rest of the standby ckt is unlikely to have gotten damaged. There's a 25V rated filter cap and a 7806, and I doubt normal unregulated is more than 10-11 V. (Xfmr is shared with Denon AVR1603, D&M at work right there.) Now let me look at how the power on is supposed to work. No xtal action could mean (a) no power (AVDD, IC107 pin 54), (b) IC stuck in reset, or (c) a duff chip. I'd swap out C149 (4.7µ) in the reset circuit for the heck of it. It's worth a try. These are not bad little units when they do work, at least they've got some decently low noise floor. H/Ks were stuck with really hissy PGAs for way longer than they should have been.
@12voltvids
5 жыл бұрын
Customer had a limit on what he was prepared to pay as he had already replaced it and just wanted to sell it, so obviously he didn't want to spend a ton on it. It could be anything. Bad CPU, is one possibility. With the way these are built they are not easy to test when apart. Have to disconnect connectors to get the board out. Need extender cables to work on board out of unit.
@DrDroogkloot
5 жыл бұрын
To bad it couldn’t be repaired but now it can be used for parts. I’m gonna buy an onkyo wich has no display but does work. See if i can fix it.
@DrDroogkloot
5 жыл бұрын
Hi, i bought it. Received it 3 days ago and today i started working on it. Resistor R9010 failed. It was open. It needs to be 2,2 ohms. I have put in 2 resistors in series wich makes it 2,6 ohms. It works great again.
@jasielunzueta5391
3 жыл бұрын
I have Marantz Sr5300 receiver. I am loooking for boards-DWP 585- CXP-740010. 160 240 CO1E or COOE. Were can I find a parts store for this receiver? Please and thank you.
@12voltvids
3 жыл бұрын
I have absolutely no idea.
@samt4202
5 жыл бұрын
Just wondering if you still have the amp. I am looking for the 2 audio DACs for a SR-5200 amp (CS4228A and CS4391) and am wondering if this amp may have them. If it does what would the cost of parts and shipping to Calgary?
@jamesplotkin4674
5 жыл бұрын
That's a mighty LONG time applying heat to those connections. What's the temperature of the tip? I use a 700 tip and wouldn't dream of holding it to a part for 5 seconds.
@12voltvids
5 жыл бұрын
700f
@123clis321
4 жыл бұрын
I have a Phillips version of this unit with a bad display. Any insight on the display driver?
@abc-ni9uw
5 жыл бұрын
What was his limit Mr 12 volt ?
@gerardjurgens2670
3 жыл бұрын
A lot of more plástico then my 1976 Marantz 1030 amplifier
@aegisofhonor
3 жыл бұрын
this is why you should use a voltage regulator with your good audio gear, it would instantly detect the spike in voltage and go into protection.
@flyguille
5 жыл бұрын
You checked the 60 / 50hz sync for timers events for the microcontroller? that can be it to act as dead, but not dead, the software maybe is waiting for the timer event to enable the standby led. If the customer plugged it in 240v when it is 120v, that can be, it is justs resistors and capacitors going from the standby supply power board to the microcontroller board. And also the filament circuitry of the display also received the impact.
@12voltvids
5 жыл бұрын
Didn't get that far.Limit as to how much they wanted to spend. Bad design, can't test with board out because plugs have to be undone to get board out. It was hit with a power surge, that is all I know.
@flyguille
5 жыл бұрын
@@12voltvids I am curious, how are the method which you charge $, based on hours? how much?
@12voltvids
5 жыл бұрын
@@flyguille I don't charge by the hour. Nobody would be able to afford me. I charge by the job. Flat rate plus parts. No fix no charge. There are some things where people bring them in and say 50 limit or 100 limit. I generally know within a few minutes if I will be able to fix in those limits. Some things are worth putting more into than others. When you get something like this, where the owner has a pretty severe limit on it, qnexa it is one that is difficult to service I check the obvious things then wash my hands on it pretty quick.
@flyguille
5 жыл бұрын
@@12voltvids Just, I feel you didn't all the basic checks, that is all.
@12voltvids
5 жыл бұрын
@@flyguille Kind of tough to do that without extension cables. With the board out connectors are disconnected. Can't power it up with the connectors unplugged. Had it been a proper design with a removable bottom then I would have put more effort into testing but with limit on what I could do I wasn't going to waste any more time on it. Not being paid to estimate it.
@uwtitanfan
5 жыл бұрын
I worked in cable tv for a number of years. I know that intro music!
@12voltvids
5 жыл бұрын
Musicbakery
@terrywilson4118
5 жыл бұрын
Recently had a sony SS receiver. Was going into protection mode, and can probably guess what the problem was..lol. Wouldn't spend money on these if they dont atleast have HDMI switching...
@efmvii
5 жыл бұрын
I saw the title of the video and before it loaded, I prayed that it wasn't the same Marantz receiver I have... and sure enough... it pretty much is :'( mine is the 4200 model, no problems yet... but good to know what to expect
@EddieJazzFan
5 жыл бұрын
I saw one of these at my local electronics recycling place. Probably has the same problem. Now I'm glad I didn't lug it home.
@Swenser
5 жыл бұрын
i ordered a cpu for my pioneer receiver. took some chasing around. but i think its worth doing the google dance. but if they dont wanna pay want can you do, right.
@Synthematix
4 жыл бұрын
Amazing to think now we have stereo amplifiers that can fit in your hand with twice the power, technology has come a very long way.
@atariandre5014
3 жыл бұрын
And you think you have the same sound quality ?
@evertdewit4037
2 жыл бұрын
Enjoy your Sonos! Crapp.
@Synthematix
2 жыл бұрын
@@atariandre5014 Actually better
@Synthematix
2 жыл бұрын
@@evertdewit4037 Dude ive got car stereos better than this
@Synthematix
2 жыл бұрын
@@evertdewit4037 And by the way, listening to music on an av amp is the worst thing you can do.
5 жыл бұрын
All these types of receivers are interchangeable garbage.. what happened to the industry? They all look slick on the outside but so many issues - piles of these in the recycling all the time and they have real bad sound quality when doing normal 2 channel. At least in my experience, there are probably standouts. I notice Sony Receivers changed for the worse around 1993ish. They were pretty cool before that, very complex though. Hahah - and right when I'm typinig this you say @7:20 ! Good point about not being able to open from the bottom, first time I saw that I smashed the thing on the ground and walked away from it.
@peteb2
5 жыл бұрын
Even though i zoomed to full 23" of my screen i couldn't see the trouble on the board soldering. The image just couldn't resolve above more that a blurred soft presentation. You're probably far too busy to listen to anyone but it might be time to consider a better resolution above 360 for your excellent videos. That might include camera (camera settings) and how ever you edit the footage.
@TmanUtube
4 жыл бұрын
If he'd told you that he'd lost their neutral in the 1st place, would you have even bothered to work on this. I love it when customers do this kind of stuff to me, & I'm just an elevator mechanic.
@SangramVID
3 жыл бұрын
Sir Which company manufacturing long life av receiver plz
@karolferet8198
5 жыл бұрын
I got a Marantz reciever dated '87 for repair. There is on connectors inside - just wires wound onto poles and you can't remove *any* of the three boards without unwinding like 15 wires. Infuriating stuff
@LifeSized101
5 жыл бұрын
Would a power conditioner/ protection power board have saved the amplifier?
@12voltvids
5 жыл бұрын
Likely yes. I had a call a few years ago to a house that had the service drop damaged by a tree. Many thing in the house were blown. All the light bulbs, the furnace, and refrigerator all toast. I got a call because the internet was down. I went there and all that was wrong was the Tripp-Lite power bar had blown. Modem, PVR, ,TV and mac computer plugged into the power bar were fine. Customer was upset that power bar was blown and they had to spend 15.00 to buy a new one. My response was "Powerbar did it's job by taking the hit and blowing internal fuses"
@12voltvids
5 жыл бұрын
@lee lee I have had many things saved by protected power strips. Also no need to spend hundreds on a "Monster" or other boutique brand. They are no better than the run of the mill Tripp lite or other 15-20 strips. As long as they have actual surge protection in them. The good ones have usually a red or green light that says protected. As long as that light is lit then the protection devices are working. If the protection devices, usually a series of MOVs and capacitors fails for any reason the light will go out. The power bar will still work but will provide no protection.
@12voltvids
5 жыл бұрын
@lee lee Yes they are the cheapest, and most expensive you can buy. Cheapest as in quality, and most expensive as in the profit to the dealer.
@LifeSized101
4 жыл бұрын
On to my SR5500 ,dead channel - any ideas?
@alokdadb734
2 жыл бұрын
14:00 it didnt turn on because u had not put the back plate on. many parts use the back plate for grounding and if thats not installed the unit stays off
@user-ml3lh1yq5l
5 жыл бұрын
I repaired the pioneer receiver, its output transistors burned, the processor showed no signs of life even after replacing the transistors, the receiver did not turn on, it was necessary to reset it using the power and band keys to reset it.
@mjouwbuis
5 жыл бұрын
Should have checked the reset signal if you didn't. The processor is unlikely to have died from overvoltage, since there's a voltage regulator in front of it.
@knottreel
5 жыл бұрын
In regards to hard-to-service products, my wake-up call came when I first tried to change the oil in my new car. What's wrong with engineers. Why do I have to remove 8 bolts to reach the oil plug? I think manufacturers do that on purpose to make the consumer dependent on their techs.
@12voltvids
5 жыл бұрын
Was that a German car by chance?
@knottreel
5 жыл бұрын
@@12voltvids My car is a Ford Escape, about 3 years old now. Actually there are nine torx bolts which secure a shroud covering everything underneath the front end of the car. I think the purpose was to improve aerodynamics. A little access hatch would be nice but I guess that wouldn't solve the problem of reaching the oil filter. By the way, everything under the hood is also under some kind of shield. When I first opened the hood, I was shocked not being able to readily find parts like the battery.
@12voltvids
5 жыл бұрын
@@knottreel I have a 2006 escape hybrid and a 2012 volt (hence the channel name, as my first videos were about the volt and the name stuck) Both of these are fun to work on. Basically dealer only, as they use specialized tools, and both have 360 volts in addition to 12, so you don't want to go poking around in there unless you know exactly what you are doing. Minor stuff like oil changes are not too bad, front half shafts replaced ect at the local wrench, but the more specialized stuff it is dealer hands on only. You think yours is tough, try a BMW on for size. You can't even check the oil on those because they do not have a dip stick.
@knottreel
5 жыл бұрын
@@12voltvids Thanks for the background on your handle. I wondered where that came from. The BMW sounds like fun. I probably won't ever afford one. My first car was a 60 Chevy. I loved that car. Everything was accessible, built like a tank, but not the most economical. One good thing was that I could do most of my mechanical repairs on it. Thanks for the heads up on the 360 volts. That would certainly be a surprise that I will avoid.
@RapperBC
5 жыл бұрын
@@12voltvids -- ha! There must be a bit of an electronics tech in many Volt owners: so far your channel has not only helped me with my decision to buy my 2013 Volt a few years ago, but also with my decision to dive in and repair my old Sony DAT machine. (A little turbine oil on a few of the gear spindles in the loading mechanism, and it's as good as new now.) Came for the Volt; stayed for the volts. Thanks for a great channel!
@AThreeDogNight
5 жыл бұрын
A power surge? No way, do not like those repairs, unless only a fuse, which is hardly ever. LOL!!!!
@uxwbill
5 жыл бұрын
That looks more than a little like a Sherwood design.
@Barbarapape
2 жыл бұрын
240v into a 110v receiver is going to take an unknown number of chips out. I used to refurbish Japanese 100v and USA 110v gear only for someone to fit a UK mains plug and wipeout the item. Old gear like this one are only worth a quick look, the time required to get to and replace parts renders them beyond economical repair.
@Paul-gz5dp
5 жыл бұрын
I fixed a TV with the same problem once. It involved replacing one 1/2w resistor.
@alexispieltin9379
5 жыл бұрын
Hello, nice job! That system looks like most computerized amps with surround sound issued since the early 90's. It could have been a Yamaha or Denon or Sony or whatever... Always a nightmare for the simple accessibility and number of screws: it was not designed to be serviced at any moment. A good tip is the number of test points on the board: if there is none, it's a junk! And if you have a look at the way it is soldered, it's clearly a systemic issue on these poorly designed and manufactured boards. Another classic issue is bad electrolytic caps, that pops or shorts for many reasons, including heat problems and low technical clearance (a 16V caps on a 15V circuit is an economic choice, a 25V gives more life expectancy, and a 63V could also be overachiever, as to ESR lower ratings...) If this 7905 is gone loose, you can suppose the surrounding filtering caps are dead, but many others also, as each IC or part on the -5V circuit can be concerned. A general replacement of these is an economical deadend, and you're not even sure of another defect on these boards or connectors... Hard to guess and troubleshoot even with the proper documentation (again, no test points, keep clear from the bench...!) As you said in the first moments, direct to the recycle bin... Alas, even with far more sophisticated design, it's direct modern replacement won't probably do much better. In consumer electronics, it's no more a quality competition like in the 70's where they built things like tanks. It was generally a good job to service an amp from Sony, Kenwood, Marantz, Sansui and many others brands issued then ( with exceptions however like Yamaha and Luxman?), many were designed for accessibility with tests points, removable back covers, separable modules... and quality components. A good rule of thumb in such maintenance job is to bet for a positive result when you can clearly identify any function of an apparatus within the first minute. And when the apparatus was conceived in that prospect... Of course, it's always possible to get an over sophisticated concept like early "digital tuners", quadraphonic decoders... I've also stumbled upon nightmarish early class D amplifiers, fought for replacement of Soviet germanium components in Thomson French top brand (made in Poland!) and many more. Another trick is to count reference or test points on the board: if there is none, it's been designed not to be fixed or with low life expectancy, so it's generally a waste of time for the technician and the client, and a good candidate for the recycle bin!
@OPTIONALWATCH
5 жыл бұрын
I think I saw an area across the long running traces that looked burned. That was probably doing the short and you missed it.
@12voltvids
5 жыл бұрын
Where was this? Time?
@maxfactor4209
4 жыл бұрын
I was expected to see a big ass toroidal transformer inside
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