Read Sony DTC-A8 / PCM-2600 / PCM-2800 Service Manual online
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SECTION 10
TROUBLESHOOTING FLOW
The following shows the general TROUBLESHOOTING flow of this unit. It can be applied to other models as well.
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(Symptom)
(Possible Cause)
(Check points, Correction)
(8)
Power does not turn on.
FL display does not light up
FL display is faulty
Does not eject, load
Tape does not run
Tape overruns
Does not playback
Stops immediately during
playback
(9)
Sound is cut or jumps,
noises during playback
Fuse, fuse resistor has been cut
Stabilized IC, Tr is open
FL power (DC value 10V, AC value V) NG
Faulty microprocessor communication
FL power (bias value V) NG
Faulty microprocessor communication
Cassette, cassette compartment detection NG
Loading, cassette compartment motor NG
Reel brake does not release
Reel motor NG
Pinch roller is not adhered
Capstan does not rotate
Drum does not rotate
No playback RF output
Small playback RF output
Playback RF waveform is not square
Playback RF waveform is unstable
Mutes continuously
Audio system power NG
D/A converter NG
Analog circuit NG (D/A converter, etc.)
End sensor error operation
Faulty tape path
Torque, tension NG
Reel system NG
Playback RF waveform partially dropped out
Head clog
Playback RF waveform unstable
Tape shifted up or down
ATF deviated
Audio system NG (D/A, analog system)
Noise in playback RF signal
Secondary voltage check
Parts replacement
FL power check
Clock system check
Bias Zener Di replacement
Clock system check
Detection SW, wiring check
Motor driver check
Brake plunger check
Reel servo periphery check
Pinch roller adhering circuit check
Capstan servo check
Drum servo periphery check
RF amplifier check
Drum cleaning
Path, torque, BT adjustment
ATF servo periphery check
Microprocessor mute signal check
Audio power check
D/A, clock system check
Line, headphone circuit check
End sensor periphery check
Path readjustment
Torque, B.T. readjustment
Reel servo periphery check
Tape scratches, recording abnormality
Drum cleaning
Path, torque, B.T. readjustment
Pinch roller compression check
ATF servo periphery check
Earth rising check, etc.
RF shield case, earth rising
Level
meter of
normal
Level meter
needle does
not move
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