Sony TC-WR445 - Electrical Adjustments (Bias & Level); Bias Consumption Current Adjustment; Record Level Adjustment; Record Bias Adjustment

Bias Consumption Current Adjustment
This adjustment should be performed when replacing the head assy
or the bias oscillating transformer (T341, T441).
Procedure :
():R-CH
digital
blank tape voltmeter
CS-413 ;
L=+¢
Zt
a
LINE IN ACH
no signal a ae
1. Connect the digital voltmeter to test point TP341.
2. Set RV341 (RV441) to mechanical center.
3. Set to FWD record mode.
4, Adjust T341 (T1441) so that the digital voltmeter reading becomes
minimum.
Adjustment Value : Maximum 220mV
Adjustment Location : AUDIO board
Record Bias Adjustment |DECK-B
Setting :
REC LEVEL control : standard record position (Refer to page 7.)
Procedure :
1. Record Mode
AF OSC
“al
blank tape
CS-123
3}
} 50mV( ~ 23.8dB)
attenuator
LINE IN
1) 315Hz
2) 10KHz
2. Playback Mode
recorded VTVM
portion
fs
Confirm that the 10kHz playback output is O + 0.5dB relative to the
315Hz output. If necessary, adjust RV341(L-CH), RV441(R-CH)
and repeat the steps given above.
LINE OUT
Adjustment Location : AUDIO board
Record Level Adjustment
Setting :
REC LEVEL control : standard record position (Refer to page 7.)
Procedure :
1. Record Mode
AF OSC
blank tape
10k Q CS-123
*) attenuator
(e)
o—o
H set —_
LINE IN
315Hz 0.5V( — 3,8dB)
2. Playback Mode
recorded VIVM
portion
LINE OUT
Confirm playback the tape recorded become adjustment level as
follows.
If necessary, adjust RV101(L-CH), RV201(R-CH) and repeat the
steps | and 2.
Adjustment Value :
LINE OUT level : — 3.8 + 0.5dB (0.47 to 0.53V)
Adjustment Location : MAIN board