Fault 1
Amplifier in protection Mode
Right channel failure.
Fault 2
Input selection erratic.
Fault 3 Brown corrosive / conductive Glue issue.
Fault 4 Rear speaker binding posts damaged.
Fault 1
Right channel Audio Output Transistors short circuit.
Other components checked and found to be defective.
Components Replaced
Resistors
R622 47 Ohm ¼ Watt
R628 220 Ohm ¼ Watt
R630, R632 0.22 Ohm 3 Watt
Transistors
Q612 2SC1941
Q618 2SB631K
Q614, Q616 2SD600K
Q620 2SD1057 Sanyo
Q622 2SB817 Sanyo
Bias for each channel set to 4 millivolts.
Fault 2
Input selection switch / encoder removed and taken apart.
Contacts cleaned with a fibre glass pencil and De-Oxit to remove all dried grease and oxidisation, fixing the erratic input selection issue.
Fault 3
Brown Glue from the plus / minus 18V power supply section removed and
2 x 18V 500mW Zener Diodes replaced.
Glue also removed from other power sections of the Amplifier.
Fault 4
Damaged speaker Binding posts replaced.
User controls and switches cleaned with De-Oxit to ensure noise free operation.
Speaker protection relays 3 x 24 V DC Coil DP/ST replaced to avoid any future issues of low-level distortion or intermittent sound loss due to worn and oxidised switching contacts.
DC off set checked on both channels low at 6 -7 millivolts.
Amplifier fully tested working correctly.
Bulb current limiter / Dim Bulb tester.
• Light Bulb Current Lim...
Rotel RA-1062 Repair
• Rotel RA1062 Amplifier...
Негізгі бет Ғылым және технология Rotel RA-02 Amplifier Repair (With Audio Tutorial)
Пікірлер: 6