djustment of the APC
Measuring
instrument
I
Frequency counter
Mode
Playback
Tape used
Alignment tape (VROATSV)
(stair-case waveform)
Test point
TP504
Adjusting point
18
control)
Specification
1. Insert the alignment tape and
unit to
the playback mode.
2. Connect the frequency counter to TP504. Adjust
C518
control) so that the counter reading
be
n
ADJUSTMENT OF
CIRCUIT
Figure 2-13.
PWB
Figure 2-14.
playback level
Measuring
instrument
VTVM
Mode
Playback
Input signal
Alignment tape
(VROATSV)
(1
level control signal)
Test point
Audio output signal
Adjusting point
R610 (playback level control)
Specification
- 9 t l d B s
1. Play back the alignment tape
level control
signal).
2. Hook up the VTVM to the audio output terminal.
3. Adjust R610 (playback level control) so that the
output level be 9 1
C h e c k i n g o f e r a s e v o l t a g e a n d o s c i l l a t i o n
frequency
Measuring
instrument
Mode
Input signal
Oscilloscope
Recording
Test point
ends of the full-erase head
Adjusting point
Specification
Erase voltage; Over 40
Oscillation frequency; 70 5
1. Place the unit to the record mode.
2. Hook up the oscilloscope to both ends of the
erase head.
3. Make sure the erase voltage is over 40 Vp-p.
4 . B e s u r e t h a t t h e o s c i l l a t i o n f r e q u e n c y i s
70 5kHz.
5
Adjustment of bias current
Measuring
instrument
VTVM
Mode
Recording
Input signal
Test point
TP601 (SIG), TP602 (GND)
Adjusting point
R630 (bias current control)
Specification
260 1
0.1
1. Place the unit to the record mode.
2. Connect the VTVM to TP601 (SIG) and TP602
(GND).
3. Adjust R630 (bias current control)
that the bias
current be 260 1
(2.6 0.1
Содержание 14VT10X1
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