Electrical Adjustments; Deck Section - Sony CMT-A70 Service Manual

CMT-A50/A70

DECK SECTION

0 dB = 0.775 V
• Precaution
1. The adjustment should be performed with the rated power
supply voltage.
2. The adjustments should be performed for both L-ch and R-ch.
REC BIAS ADJUSTMENT
Procedure:
1. Record mode
MAIN board
LINE IN jack (J301)

1) 315 Hz

2) 10 kHz

AF OSC
600 Ω
attenuator
2. Mode: Playback
recorded
portion
set
3. Confirm playback the signal recorded in step 1 become
adjustment level as follows.
4. If these levels do not adjustment level, adjustment the RV101
(L-ch) and RV201 (R-ch) to repeat steps 1 and 4.
Adjustment level: Playback output of 315 Hz to playback output
of 10 kHz: 0 ± 1.0 dB (0 ± 4.5mV).
18
SECTION 5

ELECTRICAL ADJUSTMENTS

50 mV (–23.8 dB)
blank tape
CN-123
set
level meter
+
–
SUB board
CN312 (pin 4 : L-CH)
(pin 3 : R-CH)
Adjustment Location:
– MAIN BOARD (Component Side) –
– SUB BOARD (Conductor Side) –
16 15
CN312
2 1
RV201
RV101