Sharp VC-M522HM (serv.man8) Service Manual ▷ View online
45
VC-M522HM
VC-MH722HM
VC-MH732HM
VC-MH722HM
VC-MH732HM
FLOW CHART NO.20 PLAYBACK MODE TROUBLESHOOTING
Playback picture does not appear. (E-E mode is possible.)
Is there FM signal inputted at pin(78) of
IC201?
YES
NO
Is there luminance signal input output at pins
(13),(14) and (17) of IC201?
YES
NO
Is there luminance signal inputted at pin(19)
of IC201?
YES
NO
Is there luminance signal inputted at pin(42)
of IC201?
YES
NO
Is there luminance signal inputted at pin(26)
of IC201?
YES
YES
Is there luminance signal outputted at pin(39)
of IC201?
YES
NO
Check line between pins(79) and (78) of IC201.
Check peripheral circuit of pins(13), (14) and
(17) of IC201.
Check line between pins(18) and (19) of IC201.
(C206)
Is there luminance signal outputted at pin(79)
of IC201?
YES
Is the supply V-H.SW.P. signal fed to pin(81)
of IC201?
YES
Check V-H.SW.P. line.
YES
Althouth picture playback is possible, colour does not appear.(E-E mode is possible).
Is voltage of 5V applied to the chroma power
terminal pin(61) of IC201?
YES
YES
NO
Is there chroma signal inputted at pin(46) of
IC201?
YES
NO
Is there chroma signal inputted at pin(58) of
IC201?
Is there chroma signal outputted at pin(55) of
IC201?
YES
YES
Is there chroma signal inputted at pin(54) of
IC201?
Check line between circuit of pins(55) and
(54) of IC201.
NO
NO
Check peripheral circuit pin(61) of IC201 and
PC 5V line.
Check line between pin(60) and pin(46) of
IC201.(C512)
YES
Is CCD control voltate approx. 5V applied normally to the pin(37) from pin(57) of IC201?
Is clock signal (approx. 8.86MHz/0.5Vp-p) for CCD applied normally to the pin(44) from (69) of IC 201?
Check whether the pins(73) and (75) of IC201
oscillate 4.43MHz.
Check parts around of X501.
Is there chroma signal outputted at pin(35)
and IC201?
NO
Check line between circuit of pins (58) and
(35) of IC201.
YES
YES
Check line between pins(21) and (24) of IC201.
(C208)
Check line between circuit of pins(39) and (26)
of IC201.(C212)
Is there luminance signal inputted at pin(23)
of IC201?
YES
NO
Is there luminance signal outputted at pin(52)
of IC201?
NO
Check line between circuit of pins(24) and (23)
of IC201.(C210)
Replace IC201.
Is voltage 5V applied to the CCD section power terminal at pin(36) of IC201?
46
VC-M522HM
VC-MH722HM
VC-MH732HM
VC-MH722HM
VC-MH732HM
FLOW CHART NO.21 Hi-Fi SOUND MODE TROUBLESHOOTING(1) (For VC-MH722HM/MH732HM)
No Hi-Fi E-E sound heard.
Decoder signal input terminal.
L-ch pin(15)
R-ch pin(10)
YES
NO
Front A/V signal input terminal.
L-ch pin(4)
R-ch pin(2)
NO
Are there the serial data and clock at pins(43)
and (42) of IC6301?
YES
NO
Is the supply voltage of 5V fed to pin(40) and
9V fed to pin(58) of IC6301?
YES
NO
RF output : Is there audio signal outputted at pin(59) of IC6301?
NO
YES
YES
NO
Check peripheral circuit of IC6301.
Check line ranging from pins(31),(30) of
IC2501(DECODER), to the each input terminal
of IC6301.
Check line between pins(43),(42) of IC6301
and pins(27),(28) of IC701.
Check PC 5V and PC 9V lines.
Check line ranging from front audio input
terminal of IC6301.(J2102/2103)
Is there audio signal inputted at each input terminal of IC6301 as shown in table?
YES
YES
YES
Is there audio signal outputted at pin(11) of
IC201.
Does fh trap circuit operate normally?
YES
YES
Is there audio signal inputted at pin(62) of
IC6301.
RF output : Is there audio signal outputted at pin(59) of IC6301 to the audio input terminal of tuner
(TU1551).
NO
Check the AUDIO MUTE (H) line between pin(36) of IC6301 and pin(21) of IC701.
NO
NO
NO
Check PC 5V lines.
Is there "L" level at pin(99) of IC201?
Check fh trap circuit.(Q601,Q602)
Check line between pin(11) of IC201 and pin
(62) of IC6301.(Q601,Q602)
Check AUDIO MUTE (H) line between pin(99)
of IC201 and pin(21) of IC701.
NO
Is the supply voltage of 5V fed to pin (96) of
IC201?.
YES
Is there "L" level at pin(36) of IC6301?
Is there audio signal outputted at pins(35),(29)and (32),(28) of IC2501?
YES
Check the line between IC2501 peripheral and output terminl periphery.
NO
Check peripheral circuit of IC2501.
((For Hi-Fi audio mode))
Tuner signal input terminal(U/V mono)
pin(8).
NO
AUX. signal input terminal pin(9).
NO
Check line ranging from pin(10) of IC1602.
Check line ranging from pin(61) of IC6301.
Is there audio signal inputted at each input terminal of IC201 as shown in table?
((For linear audio mode))
Line output : Is there audio signal outputted at pins(53)and(57) of IC6301?
47
VC-M522HM
VC-MH722HM
VC-MH732HM
VC-MH722HM
VC-MH732HM
FLOW CHART NO.22 Hi-Fi SOUND MODE TROUBLESHOOTING(2) (For VC-MH722HM/MH732HM)
No Hi-Fi sound recording(E-E mode is possible)
Check peripheral circuit of IC6301 as
shown in table.
Replace IC6301.
Check PC 5V lines.
YES
YES
NO
NO
NO
YES
YES
NO
NO
Is there REC FM signal outputted at the
IC6301 pins (21) to (24)(CH-1)/pins(21)
to (22)(CH-2).
Is the supply voltage of 5V fed to pin(25) of
IC6301?
Check AH-MZ harness.
Is there "L" level at pin(29) of IC6301?
Check or replace the cylinder.
Check the Hi-Fi CTL line between pin(29)
or IC6301 and pin(20) of IC701.
YES
Check the record current setting resistor
R6318 at pin(37) of IC6301.
L-ch pins(16),(17),(18),(19)
R-ch pins(35),(34),(33),(32)
FLOW CHART NO.23 Hi-Fi SOUND MODE TROUBLESHOOTING(3) (For VC-MH722HM/MH732HM)
NO Hi-Fi sound playback(E-E mode is possible).
Check peripheral circuit of IC6301 as
shown in table.
Replace IC6301.
YES
NO
YES
Check PC 5V lines.
YES
YES
NO
NO
Is there playback envelope signal out-
putted at pins (29),(30) of IC6301?
Is the supply voltage of 5V fed to pin(25) of
IC6301?
Is there A-H.SW.P. signal at pin(27) of
IC6301?
Check the A-H.SW.P. line between pin(27)
of IC6301 and pin(26) of IC701.
L-ch pins(16),(17),(18),(19)
R-ch pins(35),(34),(33),(32)
FLOW CHART NO.24 LINEAR SOUND MODE TROUBLESHOOTING(1) (For VC-MH722HM/MH732HM)
No linear sound recording(E-E mode is possible)
Is there "L" level at pin(99) of
IC201?
Check the AUDIO MUTE (H) line between pin
(99) of IC201 and pin(21) of IC701.
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Is there signal at pin(4) of IC201?
Is the supply voltage of 12V fed to
pin(2) of T651 and T652?
Check M 12V line.
Is there signal(Bias) at pin(5) of T651?
Check the Bias oscillation circuit(T651,T652,
Q651,Q652,Q654,Q655) and NORMAL BIAS
CTL, FULL ERASE BIAS CTL line.
Is there signal(Bias + Audio sig.) at
pin(6) of T651?
Check peripheral circuits of T651.
Check the MH-AA harness and A/C
head.
Replace IC201.
48
VC-M522HM
VC-MH722HM
VC-MH732HM
VC-MH722HM
VC-MH732HM
FLOW CHART NO.25 LINEAR SOUND MODE TROUBLESHOOTING(2) (For VC-MH722HM/MH732HM)
No linear sound playback(E-E mode is possible)
Is there signal at pin(100) of IC201?
Are the MH-AA harness and the PB AMP
peripheral parts normal?
YES
YES
YES
YES
YES
NO
Is there "L" level at pin(99) of IC201?
Check the AUDIO MUTE (H) line between pin
(99) of IC201 and pin(21) of IC701.
YES
NO
Is there audio signal inputted at pin
(62) of IC6651?
Check line between pin(11) of IC201 and pin
(62) of IC6651.
NO
Is there signal at pin(11) of IC201?
Replace IC201.
YES
NO
NO
Clean A/C head.
Readjust azimuth
Is the azimuth hight of A/C head properly
adjusted?
Replace A/C head.
Replace IC201.
FLOW CHART NO.26 LINEAR SOUND MODE TROUBLESHOOTING(1) (For VC-M522HM)
No E-E sound.
Is there audio signal inputted at each
input terminal of IC201 as shown in table?
Check PC 5V lines.
YES
YES
NO
YES
NO
NO
Is there audio signal outputted at pin(11)
of IC201?
Is the supply voltage of 5V fed to pin(96) of
IC201?
YES
NO
Does fh trap circuit operate normally?
Check fh trap circuit.(Q601,Q602)
Is there "L" level at pin(99) of IC201?
YES
Check AUDIO MUTE (H) line between pin(99) of
IC201 and pin(21) of IC701.
Decoder signal input terminal.
Pin(9) of IC201.
Front A/V signal input terminal.
Pin(7) of IC201.
Check line ranging from pin(31) of IC2501
(DECODER), to the each input terminal of IC6651.
Check line ranging from Front A/V input terminal of
IC6651.
YES
NO
RF output : Is there audio signal inputted
at pin(2) of TU1551?
Line output : Is there audio signal inputted
at pin(36) of IC2501?
Check line between fh trap circuit and pin(2) of
TU1551.
NO
Check peripheral circuit of IC2501.
YES
Is there audio signal outputted at pins
(35) and (29) of IC2501?
Check the line between IC2501 peri-
pheral and output terminal periphery.
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