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– 13 –
Bias Consumption Current Adjustment
DECK A DECK B
This adjustment should be performed when replacing the head assy
or the bias oscillator transformer (T131, T141),(T231, T241).
or the bias oscillator transformer (T131, T141),(T231, T241).
Setting:
REC LEVEL knob : standard recording position (See page 11.)
REC LEVEL knob : standard recording position (See page 11.)
Procedure:
1. Connect the digital voltmeter to test point TP331 ( DECK A)
and TP441 (DECK B).
2. Set DECK A: RV131 (L-CH), RV231 (R-CH) and DECK B:
RV141 (L-CH), RV241 (R-CH) to mechanical center.
3. Press the
· button to playback.
4. Adjust DECK A: T131 (L-CH), T231 (R-CH) and DECK B:
T141 (L-CH), T241 (R-CH) so that the digital voltmeter
reading becomes minimum.
reading becomes minimum.
Adjustment Value: Maximum 220 mV
Adjustment Location: MAIN board (See page 14.)
Record Bias Adjustment DECK A DECK B
Setting:
REC LEVEL knob : standard record position (See page 11.)
REC LEVEL knob : standard record position (See page 11.)
Procedure:
1. Set to test mode (See page 11.)
2. Insert a tape into deck B, press the REC
1. Set to test mode (See page 11.)
2. Insert a tape into deck B, press the REC
r button and then
press the
· button to start recording.
Adjustment level:
The palyback output of 10 kHz level difference against 315 Hz ref-
erence should be ± 0.5 dB.
The palyback output of 10 kHz level difference against 315 Hz ref-
erence should be ± 0.5 dB.
Adjustment Location: MAIN board (See page 14.)
Record Level Adjustment DECK A DECK B
Setting:
REC LEVEL knob : standard record position (See page 11.)
REC LEVEL knob : standard record position (See page 11.)
Procedure:
1. Set to test mode (See page 11.)
2. Insert a tspe into deck B, press the REC
1. Set to test mode (See page 11.)
2. Insert a tspe into deck B, press the REC
r button and then
press the
· button to start recording.
3. Record Mode
4. Playback Mode
set
AF OSC
attenuator
10 k
Ω
600
Ω
LINE IN
1) 315 Hz
2) 10 kHz
1) 315 Hz
2) 10 kHz
50 mV (–23.8 dB)
blank tape
CS-123
CS-123
3. Record Mode
set
recorded
portion
portion
level meter
LINE OUT
47 k
Ω
4. Playback Mode
5. Confirm playback the signal recorded in step 2 become adjust-
5. Confirm playback the signal recorded in step 2 become adjust-
ment level as follows.
If the selevels do not adjustment level, adjust DECK A: RV131
(L-CH), RV231 (R-CH) and DECK B: RV141 (L-CH), RV241
(R-CH) to repeat steps 3 and 4.
If the selevels do not adjustment level, adjust DECK A: RV131
(L-CH), RV231 (R-CH) and DECK B: RV141 (L-CH), RV241
(R-CH) to repeat steps 3 and 4.
set
AF OSC
attenuator
10 k
Ω
600
Ω
LINE IN
blank tape
CS-123
CS-123
315 Hz, 50 mV (–23.8 dB)
set
recorded
portion
portion
level meter
LINE OUT
47 k
Ω
5. Confirm playback the signal recorded in step 2 become adjust-
ment level as follows.
If the selevels do not adjustment level, adjust the RV101 (L-CH)
and RV201 (R-CH) to repeat steps 3 and 4.
If the selevels do not adjustment level, adjust the RV101 (L-CH)
and RV201 (R-CH) to repeat steps 3 and 4.
Adjustment Value:
LINE OUT level : –23.8 ± 0.5 dB (47.2 to 53.0 mV)
Adjustment Location: MAIN board (See page 14.)
set
3
2
1
blank tape
CS-413
CS-413
TP331 (DECK A)
TP441 (DECK B)
TP441 (DECK B)
L-CH
R-CH
digital
voltmeter
voltmeter
LINE IN
no signal
no signal
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