LG CED-8081B Service Manual page 25

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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.

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