Revox G 36, Service Manual

Page: 23 / 52

Wow and flutter Damaged or dirty pinch roller,
pinch roller pressure
insufficient, left side brake
maladjusted, jammed turntable
motor. Replace pinch roller.
Clean capstan and pinch
roller, adjust pinch roller
arm (2.1.4.) adjust brake
(2.1.2.) clean and lubricate
motor-bearings
Fast rewind or forward
too slow Brake maladjusted
Dirty brake solenoid
Open-circuit winding in the
Turn-table-motor
Defective motor-condenser Adjust brakes (2.1.2.)
Clean solenoid (2.2.3.)
Replace turntable-motor
Replace motor-condenser
4.2 Electronic troubleshooting
Trouble Cause How to repair
Playback hum Disconnection in the playback
head
Front shielding of the playback
head out of adjustment Replace playback head
Adjust front shielding
(3.1.8.)
Playback hiss Faulty tube in the playback
amplifier
Magnetised playback head Replace tube
De-magnetising the head
(3.1.2.)
Bad treble response Dirty head
Heads out of alignment
Worn out heads
Tape wrongly threaded
Bias incorrect Clean the heads (2.2.1.)
Adjust the heads (3.1.3.)
Replace heads
Thread tape as explained
in the instruction manual
Adjust bias (3.1.6.)
Absence of recording
or insufficient
recording Dirty recording-head
Defective recording-head
Dirty contact of recording
push-button
Incorrect bias adjustment
Defective bias-oscillator Clean the head
Replace the head
Clean and adjust contact
Adjust bias (3.1.6.)
Check bias-oscillator tube,
coil and erase head
Insufficient erasure Erase head soiled
Erase head defective
Bias-oscillator defective Clean heads (2.2.1.)
Replace erase head
Check bias-oscillator tube,
coil and erase head
No indication on the
VU-meter VU- meter defective
Indicator amplifier valve
defective
Maladjusted potentiometer Replace VU-meter
Replace valve
Adjust level control
(3.1.7.)
Short circuit in the
power supply Speed switch of capstan-motor
burned out Replace wafer