SHARP VC-A423M
Manual de Servicio

NO.20 FLOW CHART NO.21

VC-A423M VC-H823M

Playback Although picture played back, color does not appear (E-E mode is possible). FM signal (approx. 0.4 Vp-p) NO between pins(79) and Is voltage 5V applied to chroma Check the periphery pin(61) of

input to the pin(78) (78) IC201. power terminal pin(61) of IC201? IC201 and PC 5V line.

YES

Is chroma signal (approx. 403 Vp-p) input to the pin(79) IC201? pin(46) of IC201. (Check C512.) mVp-p/Burst) input into the
YES YES Is V-H.SW.P. applied to Check whether the pin(71) and pin(73)

NO Is luminance signal (approx. 0.4 Check between the pin(60) and

pin(46) of IC201? NO

pin(81) IC201? of IC201 oscillate (3.58 MHz)?
NO

V-H.SW.P. line. Check between the pin(58) and pin(35)
NO

Is chroma signal (approx. 508 of IC201. (Check C515.) mVp-p/Burst) input into the

pin(58) of IC201? YES
NO YES YES 286 Is chroma signal (approx. 508

Is luminance signal (approx. 0.25 Check the periphery of pins(13), Vp-p) input output to the pins(13), (14) and (16) of IC201. (Check (14) and (16) of IC201, respectively? C203, R201-2, L201, C205, R203.) pin(54) pin(35) of IC201? NO

YES output to mVp-p/Burst) input into the

Is luminance signal (approx. 0.5 Check between the pin(18) and

Vp-p) input to the IC201? pin(19) of IC201. (Check C206.) NO NO pin(54) of IC201. (Check C514.) Is luminance signal (approx. 0.5 NO Check between the pin(21) and

46
YES

YES Check between the pin(55) and

Vp-p) input to the IC201? pin(42) of IC201. (Check C208.)

YES Replace IC201.

Is luminance signal (approx. 0.5 NO Check between the pin(39) and Vp-p) input to the IC201? pin(26) of IC201. (Check C212.)

Is luminance signal (approx. 0.5 Vp-p) input to the pin(39) of IC201?
NO

Is voltage 5V applied to the CCD section power terminal pin(36) of IC201?
YES

control voltage approx. 5V applied normally to pin(37) from the pin(57) of IC201? Is CCD clock signal (approx. 7.16 MHz/0.5 Vp-p) applied to pin(44) from the pin(69) of IC201?
NO Vp-p) input to the pin(23) of IC201?

Is luminance signal (approx. 0.5 Check between the pins(24) and (23) of IC201. (Check C210.)

YES

Replace IC201.