So I opened both of them up.
The PB-770 only had one screw to remove, then just gently prising open each clip around the sides. I sprayed some contact cleaner onto the contrast control which fixed its jitteriness.
The FA-11 had some screws to remove and then gently prising open each clip as well.
I discovered the FA-11 has a five cell NiCd battery pack (P-17N-5A28) rated at 6V and 1650mAh. In Japanese it also states ... 5時間率 ... jikan-ritsu ... which translates as "five hour rate". After the small amount of charging last night it measured at 5V this morning ... after charging all day it measured at 7V. Incredibly it is date-stamped 1983, yet seems to still a good amount of charge.
Although, it might start to rapidly deteriorate now that it's being used again (??).
The docking port connector appears to have two pins that are connected to the PB-770's batteries (both 4xAA and the CR1220) ... but no ground ... so I'm still not sure if the PB-770 is supposed to draw any power from the charger/NiCd ... more manual reading required?
I discovered the SYSTEM command that confirmed it had 16KB available - this was after I had moved the RAM module from bay 3 (left) to bay 1 (right).
I didn't have any luck loading software from the tape - the programs seem to VERIFY okay, but I kept getting an "OM error" almost immediately ... out of memory ... weird.
The built-in tape deck needs some TLC - suspecting the belts. So I'll be opening the FA-11 up again and removing the tape deck circuit board to have a look. But using the Texas Instruments Program Recorder seemed to be working okay ... apart from the errors 😵💫
Негізгі бет 🇯🇵 Casio PB-770 & FA-11: Part 2 [TCE
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