Servo System Check; Rf Switching Position Adjustment (Ma-336 Board); Audio System Adjustment; Hi-Fi Audio System Adjustment (Hi-Fi Model Only) - Sony SLV-GA30 Service Manual

2-3.

SERVO SYSTEM CHECK

2-3-1. RF Switching Position Adjustment
(MA-336 Board)
[Adjustment Purpose]
To adjust the link of the A-ch and B-ch of the tape playback outputs.
To make the unit compatible with other tapes and units. If this
specification is not satisfied, the link will appear on the screen and
the screen will be disrupted, etc.
Mode Playback
Signal Alignment tape: SP color bar portion
Measurement point CH1: Video LINE OUT
CH2: CN101 pin 3 (V SWP)
Measuring instrument Oscilloscope
Adjusting element RV202
6.5 ± 1 H (413 ± 60 µσεχ): ΝΤΣΧ
Specified value
6.5 ± 1 H (416 ± 32 µsec): PAL
[Adjustment Method]
1) Playback the alignment tape.
Short-circuit between pins 1 and 2 of CN210.
2)
3) Check that "RF" is indicated on FL display.
4) Check that switching position is 6.5 ± 1 H.
5) If not meet the specified value, turn RV202 and repeat steps 1)
to 3).
CH1
CH2
Enlargement
CH1
CH2
CN202 pin 3
Fig. 6-2-3
(75 Ω terminated)
(AF switching position)
Approx.
1Vp-p
Approx.
5Vp-p
V
Vertical sync. signal
6.5 ± 1 H
(413 ± 60 µ sec): NTSC
(416 ± 32 µ sec): PAL
2-4.

AUDIO SYSTEM ADJUSTMENT

• Adjust both L ch and R ch.
[Connecting Instruments]
Audio line INPUT L/R
Audio oscillator
600 Ω
Attenuator
2-4-1. Hi-Fi Audio System Adjustment
(Hi-Fi model only)
• Perform the adjustment setting the switch on the following
positions.
• AUDIO MONITOR ..................................................... STEREO
[Adjustment Method]
1. ACE head adjustment.....Refer to the VHS mechanical
adjustment manual
2. E-E output level check
3. "Recording Bias Adjustment"
6-3
Audio line OUTPUT L/R
Audio level meter
or distortion meter
47 k Ω
VTR
Fig. 6-2-4
(S MECHANISM)(9-921-647-11).