Sony HCD-D170 Service Manual page 11

Record Bias Current Adjustment | DECK B
Procedure :
1. Mode : record
VIDEO IN
1) 315Hz C
>) 10kHz }51.2mv (-23.6dB)
AF OSC -
'blank tape
2. Mode : Playback
recorded
portion level meter
—|
main board Pin @ (L-CH)
CN307 Pin @ (R-CH).
Confirm playback the signal recorded in step 1 become
adjustment level as follows.
If these levels do not adjustment level, adjustment the RV304
(L-CH) and Ses (R-CH) on the main board to repeat steps 1
and 2.
Adjustment level: Playback output of 315 Hz to playback
output of 10 kHz : 040.5 dB
Adjustment Location : main board
Record Level Adjustment | DECK B
Procedure :
1. Mode: record
VIDEO IN
315kHz 51.2mvV (-23.6dB)
AF OSC
blank tape
CS-123
ue | se 6002
2. Mode: Playback
recorded
portion level meter
—— set
mainboard Pin @ (L-CH)
CN307 Pin @ (R-CH)
Confirm playback the signal recorded in step 1 become
adjustment level as follows.
If these levels do not adjustment level, adjustment the RV303
(L-CH) and RV403 (R- CH) on the main board to repeat steps 1
and 2.
Adjustment level :
CN307 PB level : 47.3 to 53.1 mV (—24.3 to -23.3 dB)
Adjustment Location :
[MAIN BOARD] (Component Side)
(J CN307
RV303
RV403
RV302
Aav4oi @) 8, 22
RV304 iO}
RV380
©
RV404