Sharp VC-H992U, Service Manual

Page: 46 / 82

VC-H992U
VC-H992U(A)
46
Picture (luminance) record is impossible (E-E mode is possible).
Although picture record is possible, color does not appear (E-E
mode is possible).
NO NO NO NO NO
NO
NO
NO
NO NO NO
Is luminance signal (approx. 0.5 Vp-p) input to the pin(19) of IC201?
Is luminance signal (approx. 0.3 Vp-p) input to the pin(42) of IC201?
Is luminance signal (approx. 0.5 Vp-p) input to the pin(26) of IC201?
Is luminance signal (approx. 0.5 Vp-p) input to the pin(39) of IC201?
Is luminance signal (approx. 0.5 Vp-p) input to the pin(23) of IC201?
YES YES YES YES YES
YES
YES
YES YES
YES
YES
YES
YES
Is the luminance signal (approx. 0.5 Vp-p) input and output to the pins(13) and (14) of IC201, respectively?
Check between the pins(18) and (19) of IC201. (Check C206.) Check between the pins(21) and (42) of IC201. (Check C208.)
Check between the pins(60) and (46) of IC201. (Check C512.)
Check between the pins(58) and (35) of IC201. (Check R505, C512.)
Check between the pins(39) and (26) of IC201. (Check C212.) Check between the pins(24) and (23) of IC201. (Check C210.)
Is voltage 5V applied to the CCD section power terminal pin(36) of IC201?
Is CCD control voltage approx. 5V applied normally to the pin(37) from the pin(57) of IC201? Is clock signal (approx. 7.16 MHz/0.5 Vp-p) for CCD applied normally to the pin(44) from the pin(69) of IC201?
Check the pins(13) and (14) of IC201 peripheral circuit. (R201, R202, C203)
SP mode: Is record FM signal (approx. 20 mAp-p) output to the pins(88) and (89) (SP1) and pins(86) and (87) (SP2) of IC201? EP mode: Is record FM signal (approx. 20 mAp-p) output to the IC201 pins(93) and (94) (EP1) and pins(92) and (91) (EP2) of IC20
1?
Check or replace the cylinder.
Is PRE/REC Vcc 5V applied to the pin(90) of IC201?
Is voltage 5V applied to the chroma power terminal pin(61) of IC201?
Is chroma signal (approx. 143 mVp-p/Burst) input into the pin(46) of IC201? Is chroma signal (approx. 180 mVp-p/Burst) input into the pin(58) of IC201?
Check the periphery of pin(61) of IC201 and YC 5V line.
Check whether the pins(71) and (73) of IC201 oscillate (3.58 MHz)?
Is chroma signal (approx. 180 mVp-p/Burst) output to the pin(35) of IC201?
FLOW CHART NO.19
FLOW CHART NO.20