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-350 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: Pin 2 of CN203
CH2: Pin 3 of CN203
(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-350 board JS450 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
–10 V check
Measurement Point Pin 9 of CN201
Specified Value –9.5 ±0.8 V
+6 V check
Measurement Point Pin 7, 8 of CN201
Specified Value 5.9 ± 0.2 V
+13 V check
Measurement Point Pin 2, 3 of CN201
Specified Value 13.8 ± 1.2 V
+35 V check
Measurement Point Pin 1 of CN201
Specified Value 35.0 ± 3.0 V
2-2. POWER SUPPLY ADJUSTMENTS
2-2-1. Power Supply Check
HS-921SF/921SF1 BOARD,
SR-708/718 BOARD
Checking Method:
1) Confirm that each voltage meets its specified value.
2-2-2. +6 V Adjustment
HS-921SF/921SF1 BOARD,
SR-708/718 BOARD
Mode REC or PB
Measuring Instrument Digital voltmeter
Measurement Point Pin 7, 8 of CN201
Adjusting Element RV201 (HS-921SF/921SF1
BOARD)
VR201 (SR-708/718
BOARD)
Specified Value 5.9 ± 0.2 V
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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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
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