BETA Measurement Circuit Check.
After inserting Test Disc
(TCD-784), 1x play.
IC401 Pin 89(RRF) : 2.5V+/-1.0V?
YES
IC301 Pin 23(CDR/RW) : 'H'?
YES
IC401 Pin 85 (RRFIN2) :
2+/-1.0V??
YES
IC301 Pin 36(ASYM1) :
Peak of IC401 Pin 85
(RRFIN2)?
YES
IC301 pin 37(ASYM2):
Bottom of IC401 Pin
85(RRFIN2)?
YES
Normal
66
NO
•
Check the connection of IC401 pin 89.
•
Check and replace the IC401(OTI9071).
NO
•
Check and replace the IC301 (MICOM).
NO
•
Check the connection of IC401 pin 85.
•
Check and replace the IC401.
NO
•
Check the connection of IC401 pin
77, 78.
•
Check and replace the IC401.