Adjusting Sequence; Power Supply Adjustment; Power Supply Check; Adjustment - Sony SLV-ED8ME 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 ADJUSTMENT

2-2-1.

Power Supply Check

(SR-718 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
(SR-718 BOARD)
Mode
Measuring Instrument
Measurement Point
Adjusting Element
Specified Value
Video system adjustment
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
5.9 ± 0.2 V
2-3. SERVO SYSTEM Adjustment
2-3-1.

RF Switching Position Adjustment

(MA-325 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-325 board JS161 to the GND for about 1 second
to activate the RF switching position adjustment mode.
2) Check appear "rFxx" on FL display.
3) Using the PROGRAM + 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: Pin 2 of CN501
CH2: Pin 3 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.