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Bias Consumption Current Adjustment
This adjustment should be performed when replacing the head assy
or the bias oscillating transformer (T81, T91).
Procedure :
( ): R-CH
digital
blank tape
voltmeter
CS-413
no signal
1. Connect the digital voltmeter to test point TP81.
2. Set RV81 (RV91) to mechanical center.
3. Set to FWD record mode.
4, Adjust T81 (T91) so that the digital voltmeter reading becomes
minimum.
Adjustment Value : Maximum 220mV
Adjustment Location
: AUDIO board. (See page 10)
Record Bias Adjustment
Setting :
REC LEVEL control : standard record position (Refer to page 7.)
Procedure :
1. Record Mode
AF OSC
blank tape
y 2
CS-123
o—o
r
H
set
——
LINE IN
Wot Sne } 50.1mV ( - 23.8dB)
2) 10KHz
2. Playback Mode
recorded
portion
=
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. (See page 10)
Record Level Adjustment
Setting :
REC LEVEL control : standard record position (Refer to page 7.)
Procedure :
1. Record Mode
AF OSC
blank tape
ae
ra
CS-123
(e)
o—o
.
5
:
Oo-—0
"
315HZ
50.1mV ( — 23.8dB)
2. Playback Mode
recorded
VITVM
portion
ie
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 : — 23.8 + 0.5dB (47.2 to 53mV)
Adjustment Location : SYSTEM CONTROL board.
(See page 10)
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