46
VC-A422U
VC-H822U
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 the luminance signal (approx. 0.5
Vp-p) input into pin(19) of IC201?
Is the luminance signal (approx. 0.3
Vp-p) input into pin(42) of IC201?
Is the luminance signal (approx. 0.5
Vp-p) input into pin(26) of IC201?
Is the luminance signal (approx. 0.5
Vp-p) input into pin(39) of IC201?
Is the luminance signal (approx. 0.5
Vp-p) input into 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 pins(13)
and (14) of IC201, respectively?
Check between pins(18) and (19)
of IC201. (Check C206.)
Check between pins(21) and (42)
of IC201. (Check C208.)
Check between pins(60) and (46)
of IC201. (Check C512.)
Check between pins(58) and (35) of
IC201. (Check R505, C512.)
Check between pins(39) and (26)
of IC201. (Check C212.)
Check between pins(24) and (23)
of IC201. (Check C210.)
Is 5V applied to the CCD section power
terminal pin(36) of IC201?
Is the CCD control voltage approx.
5V applied normally to the pin(37)
from the pin(57) of IC201? Is the
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 pins(13) and (14) of IC201
peripheral circuit. (R201, R202, C203)
SP mode: Is the 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 the record FM signal (approx. 20 mAp-p) output to the IC201 pins(93) and (94) (EP1) and pins(92) and (91) (EP2) of
IC201?
Check or replace the cylinder.
Is PRE/REC Vcc 5V applied to pin(90) of IC201?
Is 5V applied to the chroma power
terminal pin(61) of IC201?
Is the chroma signal (approx.
143 mVp-p/Burst) input into
pin(46) of IC201?
Is the chroma signal (approx.
180 mVp-p/Burst) input into
pin(58) of IC201?
Check the periphery of pin(61) of
IC201 and PC 5V line.
Check whether pins(71) and (73) of
IC201 oscillate (3.58 MHz)?
Is the chroma signal (approx. 180
mVp-p/Burst) output from pin(35)
of IC201?
FLOW CHART NO.18
FLOW CHART NO.19
Summary of Contents for VC-A422U
Page 51: ...VC A422U VC H822U VC A422U VC H822U 52 53 SIGNAL FLOW BLOCK DIAGRAM VC A422U ...
Page 52: ...VC A422U VC H822U VC A422U VC H822U 54 55 SIGNAL FLOW BLOCK DIAGRAM VC H822U ...
Page 53: ...56 VC A422U VC H822U POWER CIRCUIT BLOCK DIAGRAM ...
Page 63: ...72 VC A422U VC H822U M E M O ...
Page 76: ...85 VC A422U VC H822U M E M O ...
