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OK?..manual is complet and helpfull... for repairing such a old and rare boombox like JVC PCM it is necessary...
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TROUBLESHOOTING GUIDE
NO COLOR DURING SELF RECORDING AND PLAYBACK
Is there CHROMA signal at pin 15, 17, 21 of IC101.
NO
Check TU301, J8001, circuit around it.
YES
Is there CHROMA signal at pin 26 of IC101. YES
NO Change IC101.
Refer to "AT PLAYBACK, THE COLOR DOES NOT APPEAR".
AT PLAY, AUDIO DOES NOT APPEAR
At E-E, does audio appear?
NO
Refer to section "AT E-E NO SOUND".
YES
Is the voltage at pin 96 of IC101 about 2.5V ?
NO
Check A/C HEAD.
YES
Is there audio signal at pin 6 of IC101?
NO
Change IC101 and check peripheral circuit of pin 6 of IC101.
YES
Check whether there are not a damage, dirt in AUDIO HEAD and peripheral circuit of pin 24, 27 of IC701. E-13
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