Sony DTC-A8 / PCM-2600 / PCM-2800 Service Manual ▷ View online
— 94 —
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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(19)
(18)
(17)
(16)
(15)
(14)
(13)
(12)
(11)
A/D converter NG
Analog circuit NG
Recording data waveform NG
Recording amplifier NG
Does not PLL lock
Large PLL jitter
Large input fs deviation
Format is different
Receiver side is faulty
Transmission fs deviation, large jitter
Measure operation NG
Reel FG waveform is abnormal
Using tape longer than 120 min.
Key inputs (A/D) are abnormal
Microprocessor communication error
Selected song RF waveform NG
Reel system NG
Start ID is short, overlapping
Playback start-up operation NG
Start ID position is at back
Start ID is short, overlapping
Drum, capstan (half-speed) NG
fs is 48k, 44,1k in digital input
No between songs portion (unrecorded portion)
Between songs portion is short
Time from previous start ID is short
Start ID AUTO display does not light up
After recording switching signal NG
Cassette rec-proof tab is open
A/D, clock system check
Input VOL, line amplifier
Signal processing vicinity check
RF amplifier check
D-IN PLL vicinity check
Source jitter check
fs frequency check
Transmitter format check
Receiver PLL, format check
Clock system, TX signal check
Capstan servo vicinity check
FG circuit vicinity check
Use tape less than 120 min.
Display microprocessor vicinity check
Clock system check
Drum servo vicinity check
Reel servo vicinity check
Erase and then rewrite ID
ATF, capstan vicinity check
ID rewriting
Erase and then rewrite ID
Drum, capstan servo check
Only fs 32k is recordable
High source noise level
Source problem
More than 18 sec. (LP:36 sec.) required
Turn on AUTO display
Signal processing vicinity check
Close rec-proof tab
Does no analog-record
Meter needle
does not move
does not move
Meter is
normal
normal
No digital input
No digital output
Does not receive panel keys
Does not select songs
Remaining time display of
counter is abnormal
Cut off of at start of song
during playback after song is
selected
Does not LP-record only
Does no after-record
Does not perform start ID
automatic-recording
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(10)
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— 95 —
(19)
(18)
(17)
(16)
(15)
(14)
(13)
(12)
(11)
A/D converter NG
Analog circuit NG
Recording data waveform NG
Recording amplifier NG
Does not PLL lock
Large PLL jitter
Large input fs deviation
Format is different
Receiver side is faulty
Transmission fs deviation, large jitter
Measure operation NG
Reel FG waveform is abnormal
Using tape longer than 120 min.
Key inputs (A/D) are abnormal
Microprocessor communication error
Selected song RF waveform NG
Reel system NG
Start ID is short, overlapping
Playback start-up operation NG
Start ID position is at back
Start ID is short, overlapping
Drum, capstan (half-speed) NG
fs is 48k, 44,1k in digital input
No between songs portion (unrecorded portion)
Between songs portion is short
Time from previous start ID is short
Start ID AUTO display does not light up
After recording switching signal NG
Cassette rec-proof tab is open
A/D, clock system check
Input VOL, line amplifier
Signal processing vicinity check
RF amplifier check
D-IN PLL vicinity check
Source jitter check
fs frequency check
Transmitter format check
Receiver PLL, format check
Clock system, TX signal check
Capstan servo vicinity check
FG circuit vicinity check
Use tape less than 120 min.
Display microprocessor vicinity check
Clock system check
Drum servo vicinity check
Reel servo vicinity check
Erase and then rewrite ID
ATF, capstan vicinity check
ID rewriting
Erase and then rewrite ID
Drum, capstan servo check
Only fs 32k is recordable
High source noise level
Source problem
More than 18 sec. (LP:36 sec.) required
Turn on AUTO display
Signal processing vicinity check
Close rec-proof tab
Does no analog-record
Meter needle
does not move
does not move
Meter is
normal
normal
No digital input
No digital output
Does not receive panel keys
Does not select songs
Remaining time display of
counter is abnormal
Cut off of at start of song
during playback after song is
selected
Does not LP-record only
Does no after-record
Does not perform start ID
automatic-recording
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(10)
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— 95 —
(19)
(18)
(17)
(16)
(15)
(14)
(13)
(12)
(11)
A/D converter NG
Analog circuit NG
Recording data waveform NG
Recording amplifier NG
Does not PLL lock
Large PLL jitter
Large input fs deviation
Format is different
Receiver side is faulty
Transmission fs deviation, large jitter
Measure operation NG
Reel FG waveform is abnormal
Using tape longer than 120 min.
Key inputs (A/D) are abnormal
Microprocessor communication error
Selected song RF waveform NG
Reel system NG
Start ID is short, overlapping
Playback start-up operation NG
Start ID position is at back
Start ID is short, overlapping
Drum, capstan (half-speed) NG
fs is 48k, 44,1k in digital input
No between songs portion (unrecorded portion)
Between songs portion is short
Time from previous start ID is short
Start ID AUTO display does not light up
After recording switching signal NG
Cassette rec-proof tab is open
A/D, clock system check
Input VOL, line amplifier
Signal processing vicinity check
RF amplifier check
D-IN PLL vicinity check
Source jitter check
fs frequency check
Transmitter format check
Receiver PLL, format check
Clock system, TX signal check
Capstan servo vicinity check
FG circuit vicinity check
Use tape less than 120 min.
Display microprocessor vicinity check
Clock system check
Drum servo vicinity check
Reel servo vicinity check
Erase and then rewrite ID
ATF, capstan vicinity check
ID rewriting
Erase and then rewrite ID
Drum, capstan servo check
Only fs 32k is recordable
High source noise level
Source problem
More than 18 sec. (LP:36 sec.) required
Turn on AUTO display
Signal processing vicinity check
Close rec-proof tab
Does no analog-record
Meter needle
does not move
does not move
Meter is
normal
normal
No digital input
No digital output
Does not receive panel keys
Does not select songs
Remaining time display of
counter is abnormal
Cut off of at start of song
during playback after song is
selected
Does not LP-record only
Does no after-record
Does not perform start ID
automatic-recording
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(10)
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