Sharp VC-S2000 (serv.man2) Service Manual ▷ View online
41
VC-S2000HM
FLOW CHART NO.16 DRUM SERVO TROUBLESHOOTING
Drum servo does not function.
Check peripheral circuit of X701.
Is there 14.318MHz oscillation at
pins(37) and (38) of IC701?
NO
In PB mode
YES
In REC mode
Is there drum FG signal at pin(65)
of IC701 present?
Is the V-SYNC signal(reference) at
pin(50) of IC701?
YES
NO
NO
Check peripheral circuit of pin(50) of
IC701, C746, C747 and R745.
Check drum FG signal line.
Is the head switching pulse at pin(23)
of IC701 present?
NO
See FLOW CHART NO.15
(HEAD SWITCHING PULSE
TROUBLESHOOTING.)
YES
YES
Is the drum APC output at pin(34) of
IC701 and drum AFC output at
pin(32) of IC701 present?
NO
Replace IC701.
YES
YES
Is the drum control voltage applied
to pin(2) of IC702?
YES
Is pin(58) of IC701 in high
impedance?
NO
YES
NO
Check line between pins(34) and
(32) of IC701 and pin(2) of IC702.
Does the IC702 operate normally?
Replace IC701.
Replace drum motor.
42
VC-S2000HM
1
2
FLOW CHART NO.17 CAPSTAN SERVO TROUBLESHOOTING
Capstan servo does not function.
Only PB mode inoperative
YES
YES
Only REC mode inoperative
YES
YES
NO
YES
NO
NO
NO
NO
NO
Check peripheral
circuit of pin(50) of
IC701, C746, C747
and R745.
Is there 14.318MHz
oscillation at pins
(37) and (38) of
IC701?
Check peripheral
circuit of X701.
YES
YES
Dose pin(59) of
IC701 operate
normally?
Check "
1
"
Check "
2
"
Check capstan
motor unit and/or
replace.
Is there capstan
AFC and APC
at pins(31) and (33)
of IC701?
Replace IC701.
Replace A/C head.
YES
YES
YES
NO
NO
NO
Is there capstan
AFC signal at pin
(31) of IC701?
NO
NO
NO
Is there capstan
APC signal at pin
(33) of IC701?
YES
NO
Replace IC701.
Does PB CTL
signal appear at
pin (76) of IC701?
Replace IC701.
Is there REC CTL
signal output at
pins(75) and (74)
of IC701?
Does PB CTL
signal appear at
pin(76) of IC701?
Does A/C head
operate normally?
Adjust the height
of the A/C head.
Does the capstan
FG signal appear
at pin (67) of IC-
701?
Check the capstan
FG signal line bet-
ween pin(6) of AC
connector and pin
(67) of IC701.
Check peripheral
circuit of AC
connector.
Is the V-SYNC
signal(reference) at
pin(50) of IC701?
Are REC and/or PB
mode inoperative?
43
VC-S2000HM
Is there picture signal inputted
at pin(52) of IC2001?
Is there picture signal outputted
at pin(23) of IC2001?
*Check line between rear terminal PWB and pin(52) of IC2001.
See FLOW CHART NO.28 DECODER TROUBLESHOOTING.
Check PC 5V line.
FLOW CHART NO.18 E-E MODE TROUBLESHOOTING
No picture E-E signal.
Is there picture signal inputted
at pin(49) of IC701?
Is there picture signal outputted
at pin(47) of IC701?
Is there picture signal outputted
at emitter of Q708?
(1)RF output : Is there picture
signal inputted at RF video in-
put terminal of tuner?
(2)Line output : Is there picture
signal inputted at pin(3) of
IC2504?
Is there picture signal outputted
at pins(7) of IC2504?
Is the supply voltage of 5V fed
to pins(34) and (49)of IC2001?
Is there serial data and clock
signal applied to pins
(13) and (14) of IC2001?
Is there Y signal inputted at
pin(37) of IC2001?
Check line between pin(23) of
IC2001 and pin(49) of IC701.
Is the supply voltage of 5V
(OSD Vcc) fed to pin(51) of
IC701?
Check peripheral circuit of
Q708.
RF output : Check the line between Q708 peripheral and RF
video input terminal of tuner(TU1401) periphery.
Check line between Q708 and IC2504.
Check the voltage of pin(2) of IC2504.
Check line between pins
(13),(14) of IC2001 and pins
(56),(57) of IC701.
Check line between pin (39)
of IC2001 and pin(82) of
IC2401.
Check line between pin (73)
of IC2401 and pin(37) of
IC2001.
Check PC 5V line.
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
Is there picture signal inputted
at pin(82) of IC2401?
Replace IC2001.
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
Is there picture signal outputted
at pins(25),(26) of IC2501?
Check the line between IC2501 peripheral and output terminal periphery.
Check peripheral circuit of
IC2501.
YES
YES
COMPOSITE
VIDEO
Is there Y signal outputted
at pin(21) of IC2001?
Check PC 5V line.
Is the supply voltage of 5V fed
to pins(34) and (49)of IC2001?
Is there serial data and clock
signal applied to pins
(13) and (14) of IC2001?
Check line between pins
(13),(14) of IC2001 and pins
(56),(57) of IC701.
YES
Y VIDEO
YES
YES
NO
NO
NO
Replace IC2001.
YES
HIGH
LOW
Replace IC2504.
Check MENU picture on TV.
Choose L1 out from Y/C to COMP.
Is there picture signal inputted
at pins(7) of IC2501?
Check line between pin(7) of
IC2504 and pin(7) of IC2501.
NO
Check Q2503 and Q2501.
YES
S TERMINAL
Is there Y signal inputted at
base of Q2503?
Check line between pin(21) of
IC2001 and base of Q2503.
NO
YES
SCART TERMINAL
Is there Y signal inputted at pin
(1) of IC2504?
Check line between pin(21) of
IC2001 and pin(1) of IC2504.
NO
Is there Y signal outputted at
pins(7) of IC2504?
Check the voltage at pin(2) of IC2504.
YES
NO
NO
Is there picture signal outputted
at pin(25) of IC2501?
Check the line between IC2501 peripheral and output terminal periphery.
Check peripheral circuit of
IC2501.
YES
YES
HIGH
LOW
Replace IC2504.
Check MENU picture on TV.
Choose L1 out from COMP. to Y/C.
Is there Y signal inputted at
pins(7) of IC2501?
Check line between pin(7) of
IC2504 and pin(7) of IC2501.
NO
44
VC-S2000HM
FLOW CHART NO.19 RECORDING MODE TROUBLESHOOTING
Picture(Luminance) record is impossible.(E-E mode is possible.)
Is there luminance signal (approx.0.5Vp-p)
inputted at pin(19) of IC201?
YES
YES
YES
NO
Is there luminance signal (approx.0.3Vp-p)
inputted at pin(42) of IC201?
YES
NO
Is there luminance signal (approx.0.5Vp-p)
inputted at pin(26) of IC201?
YES
NO
Is there luminance signal (approx.0.5Vp-p)
inputted at pin(23) of IC201?
YES
NO
Is there luminance signal (approx.0.5Vp-p)
input and output at pins(13) and (14) of IC201,
respectively?
Check or replace the cylinder.
YES
NO
SP mode : Is there record FM signal(approx.20mVp-p) output at pins(88),(89)((SP1)) and pins(86),(87)
((SP2)) of IC201?
LP mode : Is there record FM signal(approx.20mVp-p) output at pins(93),(94)((LP1)) and pins(92),(91)
((LP2)) of IC201?
YES
Check line between pin(19) of IC201 and pin
(56) of IC2001.
Check line between pins(21) and (42) of
IC201.(C208)
Check line between pins(39) and (26) of
IC201.(C212)
Is there luminance signal (approx.0.5Vp-p)
outputted at pin(39) of IC201?
NO
Is voltage 5V applied to the CCD section
power terminal at pin(36) of IC201?
YES
Is CCD control voltage 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 IC201?
YES
Although picture record is possible, colour does not appear. (E-E mode is possible.)
Is voltage of 5V applied to the chroma section
power terminal pin(61) of IC201?
YES
YES
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?
YES
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 the supply voltage of 5V(PRE/REC Vcc) fed to pin(90) of IC201?
NO
Replace IC201.
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) of
IC201?
YES
Check line between pins(58) and (35) of
IC201.
YES
YES
Check line betwen pins(24) and (23) of IC201.
(C210)
Check peripherlal circuit of pins(13) and (14)
of IC201.(R201,R202,C203,C225)
SP mode : Is there chroma ingredient included signal(approx.20mVp-p) output at pins(88),(89)((SP1))
and pins(86),(87)((SP2)) of IC201?
LP mode : Is there chroma ingredient included signal(approx.20mVp-p) output at pins(93),(94)((LP1))
and pins(92),(91)((LP2)) of IC201?
Is there luminance signal (approx.0.4Vp-p)
inputted at pin(1) of IC2002?
NO
Is there luminance signal (approx.0.4Vp-p)
inputted at pin(1) of IC2001?
NO
Check line between pins(3) of IC2001 and pin
(1) of IC2002.
Check the voltage of pin(2) of IC2002 on
recording mode.
Check peripheral
circuit of IC2002.
Is there chrominance signal inputted at pin(6)
of IC2006?
Is there chrominance signal inputted at pin(3)
of IC501?
Is there chrominance signal inputted at pin(78)
of IC201?
NO
NO
NO
Check line between pins(28) of IC2001 and
pin(6) of IC2006.
Check line between pin(4) of IC2006 and pin
(3) 0f IC501.
Check the voltage of pin(4) of IC501.
Check line between pin(4) of
IC501 and pin(97) 0f IC701.
HIGH
Replace IC501.
LOW
LOW
Replace IC2001.
HIGH
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