7-2
2-1-6. Adjusting Sequence
Make the electrical adjustment in the following sequence.
2-3. SERVO SYSTEM ADJUSTMENT
2-3-1. RF Switching Position Adjustment
(MA-402 BOARD)
Purpose:
Adjust the interval between A ch and B ch of tape playback output.
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: Pin 2 of CN202
CH2: Pin 3 of CN202
(RF SWP)
Measuring Instrument Oscilloscope
Specified Value 6.5 ± 0.5 H (416 ± 32 µsec)
PAL
6.5 ± 0.5 H (410 ± 32 µsec)
NTSC
Adjusting Method:
1) Connect MA-402 board JS401 to the GND for about 1 second
to activate the RF switching position adjustment mode.
2) Check appear “A P” on FL display.
3) Using the channel + and – buttons, adjust to 6.5 ± 0.5 H.
4) Press the pause button.
Fig. 7-2-3.
Mode E-E
Measuring Instrument Digital voltmeter
+F, –F check
Measurement Point
Between JL 615 (IF) and JL 614 (-F)
Specified Value 3.0 ± 1.0 V
–13 V check
Measurement Point JL 625
Specified Value –11.0 ± 1.5 V
+6 V check
Measurement Point JL 611
Specified Value 5.95 ± 0.3 V
+13 V check
Measurement Point JL 604
Specified Value 13.5 ± 1.0 V
+38 V check
Measurement Point JL 618
Specified Value 32.0 ± 4.0 V
2-2. POWER SUPPLY ADJUSTMENT
2-2-1. Power Supply Check
Checking Method:
1) Confirm that each voltage meets its specified value.
Power supply adjustment
Servo system adjustment
Audio system
adjustment
Tuner system
adjustment
Approx. 1 Vp-p
Approx. 5 Vp-p
V
enlargement
CH2
CH1
CH2
CH1
Vertical sync. signal
6.5 ± 0.5 H
(416 ± 32 µsec) PAL
(410 ± 32 µsec) NTSC
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