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2-1-6.
Adjusting Sequence
Make the electrical adjustment in the following sequence.
Power supply adjustment
Servo system adjustment
Audio system
adjustment
2-2.
POWER SUPPLY ADJUSTMENT
2-2-1.
Power Supply Check
(PSM17-501 BOARD)
Mode
Measuring Instrument
+F, –F check
Measurement Point
Specified Value
–13 V check
Measurement Point
Specified Value
TE
L 13942296513
+6 V check
Measurement Point
Specified Value
+13 V check
Measurement Point
Specified Value
+38 V check
Measurement Point
Specified Value
Checking Method:
1) Confirm that each voltage meets its specified value.
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Tuner system
adjustment
E-E
Digital voltmeter
Pin qf (+F), Pin qh (–F) of CN102
2.5 ± 0.4 V
Pin qk of CN102
–11.75 ± 1.25 V
Pin 3, 4 of CN102
5.9 ± 0.2 V
Pin 5, 6 of CN102
13.8 ± 1.2 V
Pin 1, 2 of CN102
Max 40 V
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2-3.
SERVO SYSTEM ADJUSTMENT
2-3-1.
RF Switching Position Adjustment
(MA-377 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-377 board JS401 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.
Q Q
3
6 7
1 3
CH1
CH2
enargement
CH1
CH2
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7-2
2 9
9 4
2 8
PB
Alignment tape SP mode color
bar
CH1: VIDEO LINE OUT
CH2: Pin 3 of CN202
(RF SWP)
Oscilloscope
6.5 ± 0.5 H (416 ± 32 µsec) PAL
6.5 ± 0.5 H (410 ± 32 µsec)
NTSC
1 5
0 5
8
2 9
9 4
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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co
9 9
2 8
9 9
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