Samsung MM-28 Service Manual page 25

Troubleshooting
6-2 Cassette Deck
Block
TAPE IC JIC1
(KA22291)
AMPS IC JIC2
(LA2010)
BIAS OSC
6-4
Main Function
Convert of P/B & P/B SIGNAL &
DECK OUTPUT OF IC
AMPS
Oscillate RECORD BIAS (85KHz)
Check Point
Check for voltage at pin5
1 P/B Deck : H
2 R/P Deck : L
Check for voltage at pin6
When between songs : High (Normal)
When playing song :Low (Normal)
Osc Frequency : 85KHz
When inoperative : JQ5, JQ6 check
Samsung Electronics