DOWNLOAD Sharp VC-M314 (serv.man2) Service Manual ↓ Size: 140.29 KB | Pages: 24 in PDF or view online for FREE

Model
VC-M314 (serv.man2)
Pages
24
Size
140.29 KB
Type
PDF
Document
Service Manual
Brand
Device
VCR / Service Manual Chapter 6-7 Troubleshooting (35-58)
File
vc-m314-sm2.pdf
Date
PREV: Sharp VC-M314 Service Manual

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47
VC-M314HM
VC-MH834HM
FLOW CHART NO.18 E-E MODE TROUBLESHOOTING
No picture E-E signal.
NO
NO
NO
NO
NO
YES
YES
YES
YES
Is there picture signal inputted
in the pins(28),(30) and (31) 
of IC201?
Check line between rear video input terminal and pin(30) and
Check line front video input terminal and pin(28) of IC201.
Is the supply voltage of 5V
(Y
-Vcc) fed to pin(12) of 
IC201?
Check PC 5V line.
YES
Is there a picture signal 
outputted in the emitter of
Q201?
NO
Check the line between pin 
(52) of IC201 and Q201
Is there 
Y/C serial data and 
Y/C clock signal applied to 
pins(63) and (62) of IC201?
Check line between pins(63),
(62) of IC201 and pins(56),
(57) of IC701.
Replace IC201.
Is there a picture signal 
inputted in the pin(49) of
IC701?
YES
NO
Check peripheral circuit of 
Q708. 
YES
Is there a picture signal 
outputted in the pin(47) of
IC701?
Is there a picture signal 
outputted in the pin(52) of 
IC201?
See FLOW CHAR
T
 NO.28 DECODER 
TROUBLESHOOTING.
Is there a picture signal 
outputted in the emitter of
Q708?
Check the line between pin 
(52) of IC201 and  pin (49)
of IC701
Is the supply voltage of 5V 
(OSD Vcc) fed to pin (51)
of IC701?
NO
Check PC 5V line.
YES
 Line output : Is there picture
signal inputted at pin (7) of
IC2501 
NO
YES
Is there a picture signal 
outputted at pins(25), (26) of
IC2501?
Check line between Q708 and IC2501.
NO
Check peripheral circuit of 
IC2501.
YES
Check the line between IC2501
peripheral and output terminal
periphery.
 (31) of IC201. 
48
VC-M314HM
VC-MH834HM
YES
YES
YES
YES
YES
YES
NO
NO
NO
YES
NO
NO
YES
NO
NO
NO
NO
FLOW CHART NO.19 RECORDING MODE TROUBLESHOOTING
Is there luminance signal (approx.0.5Vp-p) 
inputting at pin (19) of IC201?
Is voltage 5V applied to the CCD section 
power terminal at pin(36) of IC201?
Check whether the pin(73) and (75) of IC201  
oscillate 4.43MHz.
Is there audio signal outputted at  
pin(1
1) of IC201?
Check line between pin(60)  and pin (46) of
 IC201. (C512)
Check line between pin(58) and (35)
 of IC201 .
Is there chroma signal inputted at  
pin(58) of IC201?
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?: 
Is CCD control voltage approx 0V applied
normally to the pin (37) from pin (57) of 
IC201? Is the clock signal (approx. 
8.86MHz/0.5Vp-p) for the CCD applied 
normally to the pin(44)from (69) of IC201?
Check line between pins(24), (23) of IC201 
(C210).
Check peripherial circuit of pins(13) and (14) 
of IC201. (R201, R202, C203, C225)
Is there luminance signal (approx. 0.5Vp-p), 
input and output at pins (13) and (14)
of IC201, respectively?
NO
NO
Check parts around of X501.
Athough picture record is possible, colour does not appear
.  (E-E mode is possible.)
Is there luminance signal (approx.0.3Vp-p) 
inputting at pin (42) of IC201?
YES
Is there luminance signal (approx.0.5Vp-p) 
inputting at pin (26) of IC201?
Check line between pins (18)  and (19) 
of IC201.
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) 
outputting at pin (39) of IC201?
YES
Is there luminance signal (approx.0.5Vp-p) 
inputting at pin (23) of IC201?
Is voltage of 5V applied to the chroma  
section power terminal at pin(61) of IC201?
Check peripheral circuit pin(61) of IC201 and 
PC 5V line.
Is there chroma signal inputted at pin(35) of 
IC201?
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)
(EP1)) and pins (92), (91)((EP2)) of IC201?: 
Check  or replace the cylinder
.
YES
YES
Is the supply voltage of 5V(PRE/REC 
Vcc) fed to pin (90) of IC201?
NO
Replace the IC201.
Picture (Luminance) record is impossible. (E-E mode is possible.)
49
VC-M314HM
VC-MH834HM
YES
YES
YES
NO
NO
Check line between pins(79) and (78) of IC201.
Is there luminance signal (approx. 200mVp-p)
Check V
-H.SW
.P
. line.
FLOW CHART NO.20 PLA
YBACK MODE TROUBLESHOOTING
Playback picture does not appear
. (E-E mode is possible)
Is the supply V
-H. SW
.P
. signal fed to pin 
(81) of IC201?.
Is there luminance signal input output 
at pins (13) and (14) of IC201?.
Is there luminance signal (approx. 0.5Vp-p)
input output at pin (19) of IC201?.
Is there luminance signal (approx. 0.3Vp-p)
input output at pins (42) of IC201?.
Is there luminance signal (approx. 0.5Vp-p)
input output at pins (26) of IC201?.
Check peripheral circuit of pins (13) and (14) 
of IC201?.
Check line between pins (18) and (19) 
of IC201. 
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)
input output at pin (39) of IC201?.
Is there luminance signal (approx. 0.5Vp-p)
inputted at pins (23) of IC201?.
Is voltage 5V applied to the CCD section power terminal at pin (36) of IC201?.
Although picture playback picture is possible, colour  does not appear in P
A
L
 mode.(E-E mode is possible)
Is voltage of 5V applied to the chroma power
terminal pin(61) of IC201?
Is there chroma signal (approx. 156mVp-p/
burst) inputted at pin (46) of IC201?.
Is there chroma signal (approx. 197mVp-p/
bust) inputted at pin (58) of IC201?.
YES
YES
YES
Is there luminance signal (approx. 0.5Vp-p)
outputted at pins (52) of IC201?.
Check line between circuit of pins (24)and(23) 
of IC201. (C210).
See FLOW CHAR
T
 NO.18 E-E MODE 
TROUBLESHOOTING..
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Replace IC201.
NO
Check peripherial circuit pin (61) of IC201 and
PC 5V line
Check line between pin (60)and pin (46)
 of IC201.(C512).
NO
Check whether the pins (73) and (75)of IC201
oscillate 4.43MHz at P
AL/SECAM mode.
Check parts around of X501.
Check line between circuit of pins (58)and 
(35) of IC201.
Is there chroma signal (approx. 197mVp-p/
burst) outputted at pin (35) of IC201?.
Is there chroma signal (approx. 300mVp-p) 
outputted at pin (55) of IC201?.
Is there chroma signal (approx. 300mVp-p/
bust) inputted at pin (54) of IC201?.
Check line between circuit of pins (55)and 
(54) of IC201.
Replace IC201
YES
NO
YES
YES
YES
YES
YES
YES
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?
NO
Is there FM signal (approx. 200mVp-p)
inputted at pin(78) of IC201?
outputted at pin(78) of IC201?
50
VC-M314HM
VC-MH834HM
YES
YES
YES
NO
NO
Check line between pins(79) and (78) of IC201.
Is there luminance signal (approx. 200mVp-p)
Check V
-H.SW
.P
. line.
FLOW CHART NO.20 PLA
YBACK MODE TROUBLESHOOTING
Playback picture does not appear
. (E-E mode is possible)
Is the supply V
-H. SW
.P
. signal fed to pin 
(81) of IC201?.
Is there luminance signal input output 
at pins (13) and (14) of IC201?.
Is there luminance signal (approx. 0.5Vp-p)
input output at pin (19) of IC201?.
Is there luminance signal (approx. 0.3Vp-p)
input output at pins (42) of IC201?.
Is there luminance signal (approx. 0.5Vp-p)
input output at pins (26) of IC201?.
Check peripheral circuit of pins (13) and (14) 
of IC201?.
Check line between pins (18) and (19) 
of IC201. 
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)
input output at pin (39) of IC201?.
Is there luminance signal (approx. 0.5Vp-p)
inputted at pins (23) of IC201?.
Is voltage 5V applied to the CCD section power terminal at pin (36) of IC201?.
Although picture playback picture is possible, colour  does not appear in P
A
L
 mode.(E-E mode is possible)
Is voltage of 5V applied to the chroma power
terminal pin(61) of IC201?
Is there chroma signal (approx. 156mVp-p/
burst) inputted at pin (46) of IC201?.
Is there chroma signal (approx. 197mVp-p/
bust) inputted at pin (58) of IC201?.
YES
YES
YES
Is there luminance signal (approx. 0.5Vp-p)
outputted at pins (52) of IC201?.
Check line between circuit of pins (24)and(23) 
of IC201. (C210).
See FLOW CHAR
T
 NO.18 E-E MODE 
TROUBLESHOOTING..
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Replace IC201.
NO
Check peripherial circuit pin (61) of IC201 and
PC 5V line
Check line between pin (60)and pin (46)
 of IC201.(C512).
NO
Check whether the pins (73) and (75)of IC201
oscillate 4.43MHz at P
AL/SECAM mode.
Check parts around of X501.
Check line between circuit of pins (58)and 
(35) of IC201.
Is there chroma signal (approx. 197mVp-p/
burst) outputted at pin (35) of IC201?.
Is there chroma signal (approx. 300mVp-p) 
outputted at pin (55) of IC201?.
Is there chroma signal (approx. 300mVp-p/
bust) inputted at pin (54) of IC201?.
Check line between circuit of pins (55)and 
(54) of IC201.
Replace IC201
YES
NO
YES
YES
YES
YES
YES
YES
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?
NO
Is there FM signal (approx. 200mVp-p)
inputted at pin(78) of IC201?
outputted at pin(78) of IC201?
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