Yamaha PDM-4210 Service Manual page 24

PDM-4210
Troubleshooting (PICTURE)
[VIDEO PWB Circuit]
No picture, no color or dark
Single picture or Main picture
Are waveforms at pin1(Y),
Pin3(CB) and pin5(CR)
of PYM?
No
Are waveforms at pin 37(Y), 36(CB)
and 35(CR) of I202?
No
Component Input
Are waveforms at pin9(Y), 11(CB)
and 13(CR) of I202?
No
Check Input terminal
PAL/SECAM
Are waveforms at pin44 (Y)
and 43 (C) of I501?
No
Are waveforms at pin25 (Y)
and 27 (C) of I301?
No
Are waveforms at pin7
of I301?
No
24
Sub picture
Yes
Check Formatter PWB
Yes
Check Q205, Q206, Q207 etc.
Yes Yes
Check I202
Yes
Check I501
Check Q322 Q327
Yes
X304 or X305, etc.
Yes
Check I301
Are waveforms at pin44
of I201?
No
Check I201, etc.
Trouble of Sub picture
Video Input
Are waveforms at pin39(Y), 41(CB)
and 43(CR) of I202?
No
Are waveforms at pin21(Y), 22(CB)
and 23(CR) of I501?
No
NTSC
Yes
Are waveforms at pin5 (Y)
and 7 (C) of I501?
No
Are waveforms at pin89 (Y)
and 88 (C) of I302?
No
Are waveforms at pin93
of I302?
No
Yes
Check Q203, Q301 Q307 etc.
Check Q508, Q509,
Yes
and Q510
Yes
Check Q317 Q324,
Q328, X302 or X303, etc.
Yes
Check I3A1