6-2
2-1-6.
Adjusting Sequence
Make the electrical adjustment in the following sequence.
Checking power supply
Servo system adjustment
Audio system adjustment
2-3.
SERVO SYSTEM ADJUSTMENT
2-3-1.
RF Switching Position Adjustment
(MA-370 Board)
Purpose:
Adjust the interval between A ch and B ch of tape playback out-
put.
Improve the interchangeability with other tapes and sets.
When it is out of order, the interval appears on the screen, the
screen is disturbed.
Mode
PB
Signal
Alignment tape SP mode
color bar
Measurement Point
CH1: VIDEO LINE OUT
CH2: Pin
3
of CN270
(RF SWP)
Measuring Instrument
Oscilloscope
Adjusting Element
Remote commander (Note)
Specified Value
6.5 ± 0.5 H (410 ± 32 µsec)
Note: RMT-V266A (1-418-694-11) or
RMT-V266B (1-418-695-11)
Adjusting Method:
1) Connect MA-370 board JS401 to the GND for about 1 second
to activate the RF switching position adjustment mode.
2) Check that the Power LED flash on and off.
3) Using the c and – buttons on the remote commander,
adjust to 6.5 ± 0.5 H.
4) Press the pause button.
Fig. 6-2-3.
Mode
STANDBY
Measuring Instrument
Digital voltmeter
D +6 V check
Measurement Point
Corrector of Q607
Specified Value
5.56 to 6.25 V
2-2.
POWER SUPPLY ADJUSTMENT
2-2-1.
Power Supply Check
(MA-370 Board)
Approx. 1 Vp-p
Approx. 5 Vp-p
V
enargement
CH2
CH1
CH2
CH1
Vertical sync. signal
6.5
±
0.5 H
(410
±
32
µ
sec)
Mode
E-E
Measuring Instrument
Digital voltmeter
SW +12 V check
Measurement Point
Pin
2
of IC601
Specified Value
11.7 to 12.3 V
SW +5 V check
Measurement Point
Emitter of Q607
Specified Value
4.8 to 5.4 V
MTR 12 V check
Measurement Point
Corrector of Q605
Specified Value
12.5 to 14.5 V
Checking Method:
1) Confirm that each voltage meets its specified value.