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46
VC SA350/350W
VC-SA355
VC-SA550/550W
YES
YES
YES
YES
NO
NO
NO
FLOW CHART NO.24 LINEAR SOUND MODE TROUBLESHOOTING(1)
Check line between pin(99) of IC201 and
pin(21) of IC701.
Is there audio signal outputted at pin(11) of
IC201?
Does fh trap circuit operate normally?
(Q604)
Line output terminal :
Check line ranging from fh trap circuit to the audio output terminal.
RF output terminal :
Check line ranging from fh trap circuit to the audio input terminal of tuner (TU101).
NO
NO
Is there audio signal inputted at each input
terminal of IC201 as shown in table?
U/V tuner audio input terminal.
Normal audio input terminal.
pin(8)
pin(9)
Check line ranging from IF circuit.
Check line ranging from EXT. audio input
terminal
Replace IC201.
Is there "L" level at pin(99) of IC201?
No E-E sound heard.
Check fh trap circuit.(Q604)
NO
NO
NO
FLOW CHART NO.25 LINEAR SOUND MODE TROUBLESHOOTING (1)
Is there "L" level at pin (99) of IC201?
Is there a signal at pin(4) of IC201?
YES
YES
No linear sound recording
Is the supply voltage of 12V fed to pin(2) of
T601?
Check the AUDIO MUTE (H) line between pin
(99) of IC651 and pin (21) of IC701.
Replace IC201.
Check PC 12V line.
NO
YES
YES
Is there signal (Bias) at pin (5) of T601?
Check the Bias oscillation circuit (T601,Q602,
Q603) and FE BIAS CTL line.
NO
Is there signal (Bias + Audio sig.) at pin (6)
of T601?
YES
Check the MH-AM harness and A/C head.
Check peripheral circuits of T601.
YES
NO
NO
NO
NO
NO
FLOW CHART NO.26 LINEAR SOUND MODE TROUBLESHOOTING (2)
YES
YES
Clean A/C Head.
Is the azimuth hight of A/C head properly
adjusted?
Replace A/C head.
Is there "L" level at pin (99) of IC201?
Is there a signal at pin(11) of IC201?
YES
YES
Are the MH-AA harness and the PB AMP
peripheral parts normal?
Readjust azimuth hight.
YES
No linear sound playback
Is there a signal at pin(100) of IC201?
Does fh trap circuit operate normally?
(Q604)
YES
Check line ranging from EXT. terminal to
audio output terminal.
Check the AUDIO MUTE (H) line between pin
(99) of IC201 and pin (21) of IC701.
Replace IC201.
Check fh trap circuit. (Q604)