Adjusting Sequence; Power Supply Adjustment; Power Supply Check; Servo System Adjustment - Sony SLV-ED212 Service Manual

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

Mode
Measuring Instrument
+F, –F check
Measurement Point
Specified Value
–13 V check
Measurement Point
Specified Value
+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.
Tuner system
adjustment
E-E
Digital voltmeter
Between JL 615 (IF) and JL 614 (-F)
3.0 ± 1.0 V
JL 625
–11.0 ± 1.5 V
JL 611
5.95 ± 0.3 V
JL 604
13.5 ± 1.0 V
JL 618
32.0 ± 4.0 V
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
Signal
Measurement Point
Measuring Instrument
Specified Value
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.
CH1
CH2
CH1
CH2
Fig. 7-2-3.
7-2
PB
Alignment tape SP mode
color bar
CH1: Pin 2 of CN202
CH2: Pin 3 of CN202
(RF SWP)
Oscilloscope
6.5 ± 0.5 H (410 ± 32 µsec)
NTSC
Approx. 1 Vp-p
Approx. 5 Vp-p
V
enlargement
Vertical sync. signal
6.5 ± 0.5 H
(410 ± 32 µsec) NTSC