Sony TC-RX370 - Bias and Record Level Adjustments

Bias Consumption Current Adjustment
This adjustment should be perfomed when replacing the head
assy or the bias oscillating transformer (T81, T91).
Procedure:
( ): R-CH
digital
voltmeter
blank tape
CS-413
set —_
LINE IN
no signal
Connect the digital voltmeter to test point TP81.
Set RV81 (RV91) to mechanical center.
Set to FWD record mode.
Adjust T81(T91) so that the digital voltmeter reading
becomes minimum.
ee Co Se
Adjustment Location: AUDIO board
Record Bias Adjustment
Setting :
REC LEVEL control: standard record position (Refer to
page 6.)
Procedure:
1. Record Mode
etek blank tape
CS-123
EE 5}
1) 315Hz
2) l1OkHz
LINE IN
} 31.6mV (—27.8dB)
2. Playback Mode
LINE OUT
Playbck the signal recorded in step 1.
Confirm that the 10kHz playback output is 0+0.5dB relative
to the 315Hz output. If necessary, adjust RV81 (L-CH), RV91
(R-CH) and repeat the steps given above.
Adjustment Location: AUDIO board
Record Level Adjustment
Setting:
REC LEVEL control: standard record position (Refer to
page 6. )
Procedure:
1. Record Mode
AF OSC
2) attenuator
oneee)
Wpaekenend
O-——-O O
Ld ENDL J
blank tape
CS$-123
LINE IN
315Hz, 31.6mV (—27.8dB)
2. Playback Mode
recorded
portion
LINE OUT
Confirm playback the tape recorded become adjustment level
as follows.
If necessary, adjust RV101 (L-CH), RV201 (R-CH) and repeat
steps 1 and 2.
Adjustment Value :
LINE OUT level: —27.8+0.5dB (29 to 33.4mV)
Adjustment Location: PANEL Board
—Adjustment Parts Location Diagrams—
{PANEL BOARD] (COMPONENT SIDE)
I
4
RV502
|_|
RV503 RV50I
| ie
L J
RVIO!
(L-CH)
RV201
(R-CH)
Record Level