VC-V50S
VC-V80T
VC-V91T
45
No linear sound playback
Are MH-AA harness and the PB AMP.
peripheral parts normal?
Is the A/C head surface clean?
Is A/C head height adjusted properly?
Replace A/C head.
Check A-MUTE (H) line.
Readjust A/C head height.
Is audio signal output to the pin(11) of
IC201?
YES
YES
YES
YES
YES
YES
NO
NO
NO
Is it possible to confirm the audio signal
(PB EQ) on the pin(100) of IC201?
Check peripheral parts of Q605.
Is the pin(99) of IC201 in "L" level?
Does fh trap circuit operate normally?
(Q605)
FLOW CHART NO.22 LINEAR SOUND MODE TROUBLESHOOTING(3)
Replace IC201.
NO
NO
YES
1
Line output terminal : Check line ranging from fh trap circuit to the audio output terminal.
2
RF output terminal : Check line ranging from fh trap circuit to the audio input terminal of
RF converter(CNV201).
NO
NO
YES
NO
NO
NO
NO
YES
YES
YES
YES
YES
FLOW CHART NO.20 LINEAR SOUND MODE TROUBLESHOOTING(1)
No E-E sound heard.
Check the line between external audio input
terminal (J203) and pin(9) of IC201.
Is supply voltage of 5V(A-Vcc) fed to
the pin(96) of IC201?
Replace IC201.
Is there Y/C serial data and Y/C signal clock
applied to the pins(63) and(62) of IC201?
Check the line between pins(63) and (62)
of IC201 and all the way up to pins(53) and
(54) of IC801.
Is "L" level applied at pin(99)
of IC201?
Check peripheral parts of Q605.
Does fh trap circuit operate normally? (Q605)
Check A-MUTE (H) line.
Check PC 5V line.
1
Line output terminal : Check line ranging from fh trap circuit to the audio output terminal.
2
RF output terminal : Check line ranging from fh trap circuit to the audio input terminal of
RF converter(CNV201).
Is audio signal input into the pin(9) of
IC201?
Is audio signal outputted to the pin(11)
of IC201?
No linear sound recording
(E-E mode is possible).
Check A-MUTE (H) line.
Is the operation of IC201 normal?
Replace IC201.
Does the bias oscillation circuit operate
normally?
YES
YES
YES
NO
NO
NO
Is "L" level applied at pin(99) of IC201?
Is audio signal on which bias signal is
superposed output to pin(6) of T601?
Is the supply voltage of 12V fed to pin(2)
of T601?
Check the bias oscillation circuit.
(T601, Q602~3 and their peripheral parts.)
Check the MH-AA harness and A/C head.
FLOW CHART NO.21 LINEAR SOUND MODE TROUBLESHOOTING(2)
Check M 12V line.
Check BIAS CTL (L) line.
YES
Is audio signal output to the pin(4) of IC201?
YES
NO
YES
YES
