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2-1-6.
Adjusting Sequence
Make the electrical adjustment in the following sequence.
Checking power supply
Servo system adjustment
Audio system adjustment
2-2.
POWER SUPPLY ADJUSTMENT
2-2-1.
Power Supply Check
HS-921SF1 BOARD,
SR-708 BOARD
Mode
Measuring Instrument
–10 V check
Measurement Point
Specified Value
+6 V check
Measurement Point
Specified Value
+13 V check
Measurement Point
Specified Value
+35 V check
Measurement Point
Specified Value
Checking Method:
1) Confirm that each voltage meets its specified value.
2-2-2.
+6 V Adjustment
HS-921SF1 BOARD,
SR-708 BOARD
Mode
Measuring Instrument
Measurement Point
Adjusting Element
Specified Value
E-E
Digital voltmeter
Pin 9 of CN600
–10.3 ±0.8 V
Pin 7, 8 of CN600
5.9 ± 0.2 V
Pin 2, 3 of CN600
13.3 ± 0.5 V
Pin 1 of CN600
38.0 ± 3.0 V
REC or PB
Digital voltmeter
Pin 7, 8 of CN201
RV201 (HS-921SF1 BOARD)
VR201 (SR-708 BOARD)
5.9 ± 0.2 V
2-3.
SERVO SYSTEM ADJUSTMENT
2-3-1.
RF Switching Position Adjustment
(MA-323 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
Signal
Measurement Point
Measuring Instrument
Specified Value
Adjusting Method:
1) Connect MA-323 board JS140 to the GND for about 1 secont
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.
CH1
CH2
enargement
CH1
CH2
7-2
PB
Alignment tape SP mode color
bar
CH1: VIDEO LINE OUT
CH2: Pin 2 of CN501
(RF SWP)
Oscilloscope
6.5 ± 0.5 H (416 ± 32 µsec) PAL
6.5 ± 0.5 H (410 ± 32 µsec)
NTSC
Approx. 1 Vp-p
Approx. 5 Vp-p
V
Vertical sync. signal
6.5 ± 0.5 H
(416 ± 32 µsec) PAL
(410 ± 32 µsec) NTSC
Fig. 7-2-3.
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