Read Sharp VC-M321HM (serv.man5) Service Manual online
46
VC-M321HM
VC-M331HM
VC-M331HM
YES
YES
YES
YES
NO
NO
NO
FLOW CHART NO.21 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?
Check fh trap circuit. (Q601)
Does fh trap circuit operate
normally? (Q601)
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 (TU1551).
NO
NO
NO
Is there audio signal inputted at
each input terminal of IC201 as
shown in table?
Beeper input terminal.
U/V tuner audio input
terminal.
Normal audio input
terminal.
pin(7)
pin(8)
pin(9)
Check line ranging from pin(97) of
IC701.
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.
YES
YES
NO
NO
NO
NO
FLOW CHART NO.22 LINEAR SOUND MODE TROUBLESHOOTING(2)
Check the AUDIO MUTE (H) line
between pin(99) of
IC201 and
pin(21) of IC701.
Is there "L" level at pin(99) of IC201?
Is there a signal at pin(4) of IC201?
Replace IC201.
YES
YES
YES
NO
Check the bias oscillation circuit
(T651,Q651,Q652) and A-ERASE
BIAS CTL line.
Is there a signal(Bias+Audio sig.)
at pin(6) of T651?
Check the MH-AA harness and A/C
head.
Is the supply voltage of 12V fed to
pin(2) of T651?
Is there a signal(Bias) at pin(5) of
T651?
Check AT 12V line.
Check peripheral circuit of T651.
No linear sound recording
YES
YES
YES
YES
NO
NO
NO
NO
NO
FLOW CHART NO.23 LINEAR SOUND MODE TROUBLESHOOTING(3)
Are the MH-AA harness and the PB
AMP peripheral parts normal?
Check the AUDIO MUTE (H) line
between pin(99) of
IC6301 and
pin(21) of IC701.
Check fh trap circuit. (Q601)
Does fh trap circuit operate
normally? (Q601)
Clean A/C head.
YES
Is azimuth height of A/C head
properly adjusted?
YES
Replace A/C head.
Readjust azimuth hight.
Replace IC201.
Is there a signal at pin(100) of
IC201?
Is there "L" level at pin(99) of
IC201?
Is there a signal at pin(11) of
IC201?
YES
Check line ranging from ext. audio
output terminal.
No linear sound playback
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