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VIL. AMPLIFIER
ADJUSTMENT
No
|
i
VR-l02
2k8
VR-101
20kB
RIGHT
REC
RIGHT
PLAYBACK
LEVER
ADJUST
LEVER
ADJUST
1. PLAYBACK OUTPUT LEVEL
(PRE-AMPLIFIER) ADJUSTMENT
a) Connect a high sensitivity V.T.V.M. to the Line
Output Jack.
b) Set the Tape Speed Selector Switch to the "7-1/2"
position.
c) 'Playback at 250 Hz pre-recorded tape.
d) Adjust the VR
101 (semi-fixed resistor 20 K-B,
Fig. 7-1) of the pre-amplifier so that Line Output
Voltage indicates 1.228 V (+ 4 dbm).
|
VR-102 2kB
VR-IOL
20kB
LEFT
REC
LEFT
PLAYBACK
LEVER ADJUST
LEVER
ADJUST
Fig. 7-1
2.
ADJUSTMENT OF RECORDING
LEVEL
Recording Amplifier Adjustment should be made only
after
Head
Adjustment
(vertical
and
horizonatal
azimuth) and Playback Amplifier Adjustments have been
made.
1) As shown in Fig. 7-2, connect an Audio Oscillator
and
Attenuator
to the Line
Input.
Connect
a
High-sensitivity V.T.V.M. to the Line Output.
.
2) Set Equalizer Switch and Tape Speed Selector to
"7-1/2.
3)
Load a blank test tape (Scotch No. 150) on the tape
recorder and set the Rec/Playback Knob to "Rec"
position.
4)
Supply a 1000 Hz signal from the audio oscillator to
the Line Input, and adjust the volume control so
that the VU Meter indicates "O'? VU (intermediate
between red and black).
5)
Record the tape and check playback to see whether
the- VU Meter indicates "O"' VU.
6) If the pointer of the VU Meter fails to register "0"
VU, repeat recording and playback by adjusting the
semi-fixed resistor VR 102 (2 KB) on the recording
pre-amplifier until the "0" VU reading is obtained
both on recording and playback.
Line
Line
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