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6-5.
BIAS OSCILLATOR
CHECK
Test Point:
TP-801
Check for:
90 to 110V rms
Adjustment:
None
Signal source:
No signal
Procedure:
1.
Set
up
record
mode
with
no
input
signal.
2.
Connect
VTVM
to TP-801.
3.
Check for 90 to 110V rms reading on VTVM.
6-6.
RECORD
BIAS SETTING
Test Point:
Across head terminals
Adjust for:
36 V rms + 0.5 V rms
Adjustment:
C829 (normal record mode)
L803
(audio dub mode)
Signal source:
No input signal
Fig. 6-3
Bias setting
6-2
Procedure:
1.
Connect VTVM
across head terminals.
2.
Set up record mode with no signal.
3.
Adjust
C829
for 36V rms reading on VTVM.
4.
Set up then audio dub mode.
5.
Adjust
L803
for the
same
36V rms
reading
on VTVM.
6-7.
BIAS TRAP ADJUSTMENT
Test Point:
EARPHONE
jack
(audio
output)
Adjust for:
Minimum
bias leakage
Adjustment:
L801
Signal source:
No signal
Procedure:
1.
Connect VTVM
as shown in Fig. 6-1.
2.
Set up record mode.
3.
Adjust for minimum
reading on VTVM.
6-8.
RECORD
LEVEL ADJUSTMENT
Test Point:
EARPHONE
jack = (audio
output)
Adjust for:
0.50V (-4 dB)
Adjustment:
R826
Signal source:
1kHz, -65 dB
Procedure:
1.
Connect
audio
oscillator
and
attenuator
to
MIC
input
jack
to
provide
1 kHz
signal at
-65 dB.
2.
Connect
VTVM
as shown in Fig. 6-1.
3.
Adjust
R826
for
0.50V (-4dB)
reading
on
VTVM.
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