Adjusting Sequence; Power Supply Adjustments; Power Supply Check; Servo System Adjustments - Sony SLV-CA30 Service Manual

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 ADJUSTMENTS

2-2-1.

Power Supply Check

(MA-366 Board)
Mode
Measuring Instrument
+12 V check
Measurement Point
Specified Value
+5 V check
Measurement Point
Specified Value
+9 V check
Measurement Point
Specified Value
MTR12 V check
Measurement Point
Specified Value
Checking Method:
1) Confirm that each voltage meets its specified value.
E-E
Digital voltmeter
Collector of Q604
12.0 ± 0.3 V
Pin 7 of CN001
5.0 ± 0.25 V
Emitter of Q604
9.0 ± 0.3 V
Pin 4 of CN001
12.0 ± 0.3 V
2-3.

SERVO SYSTEM ADJUSTMENTS

2-3-1.

RF Switching Position Adjustment

(MA-366 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
Adjusting Element
Specified Value
Adjusting Method:
1) Connect MA-366 board JS401 to the GND for about 1 second
to activate the RF switching position adjustment mode.
2) Check that D403 and D405 mutually flash on and off quickly.
3) Check that switching position is 6.5 ± 1.0 H.
4) If not meet the specified value, turn RV101 and repeat steps 3
to 4.
CH1
CH2
enargement
CH1
6.5 ± 1.0 H
(416 ± 60 µsec) PAL
CH2
(413 ± 60 µsec) NTSC
6-2
PB
Alignment tape SP mode
color bar
CH1: VIDEO LINE OUT
CH2: Pin 3 of CN202
(V SWP)
Oscilloscope
RV101
6.5 ± 1.0 H (416 ± 60 µsec)
PAL
6.5 ± 1.0 H (413 ± 60 µsec)
NTSC
Approx. 1 Vp-p
Approx. 5 Vp-p
V
Vertical sync. signal
Fig. 6-2-3.