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3.
Recording bias adjustment (MA-106 board)
Mode
Recording and playback (SP mode)
Signal
400 Hz, -30 dBs
7 kHz, -30 dBs
Measurement Point _ | AUDIO LINE OUT terminal
Measurement
Audio level meter
Equipment
Adjustment Element
| RV301
Specified Value
0£2dB
Note: Tape path adjustment should have been completed.
Adjustment Method:
1) Input signal of 400 Hz, -30 dBs simultaneously to both L
and R channels of AUDIO LINE IN.
2) Make recording.
3)
Set the AUDIO LINE IN signal to 7 kHz, ~30 dBs and make
recording.
4)
Playback a recorded portion and measure output levels at
400 Hz and 7 kHz.
5) Confirm that the 7 kHz playback signal level is within a
range of 0 + 2 dB against the 400 Hz playback signal level .
When beyond this range, adjust RV301 and repeat the steps
(1) through (5).
7-7. TUNER SYSTEM ADJUSTMENT
7-7-1,
RF AGC Adjustment (TU-132 Board)
Signal
Broad cast TV signal
Adjustment Element | RVO02
Adjustment Method:
1) Adjust the monitor TV to a maximum contrast.
2)
Turn the RV002 to make snow noise visible.
3)
Tum the RV0O02 in an opposite direction and set it to the
point where the snow noise disappears.
4)
Receive each channel and confirm that there are no beat
picture or snow noise due to cross modulation.
7-7-2.
Audio Multiple Recorder Adjustment
1.
Stereo filter and VCO adjustment (TU-132 board)
(Connection)
1)
Connect
the audio
generator,
frequency
counter,
10 uF
capacitor (]-124-261-00)
and
600Q
resistor
(1-249-410-11
2pes) as follows.
2)
Tuner should be received no signal.
oO
level
chi
isti
E 16001 ee
ore eek F
4.
Overall
level
characteristic check
C045,
| WIFE
rote
Icoo2
|
=
}
C030.
Mode
Recording and playback (SP mode)
Aude gercictor
+.
:
MPX
Signal
AUDIO LINE OUT terminal
toe
Measurement Point
Audio
level
meter
ea
6002)
1
l
|
pcasurenicat
Playback level:~7.5 + 2 dBs
TU-132 BOARD ;
Equipment
fm
Checking Method:
1) Input audio signal of 400 Hz, -7.5 dBs simultaneously to
both L and R channels of AUDIO LINE IN.
2) Make recording.
3) Playback the recorded portion.
4) Make sure that playback level is -7.5 + 2 dBs.
Frequency
9
courte
Fig. 7-15.
—178—
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