Servo System Check; Rf Switching Position Adjustment; (Ma-341 Board); Audio System Adjustment - Sony slv-779hf Service Manual

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2-3.

SERVO SYSTEM CHECK

2-3-1.

RF Switching Position Adjustment

(MA-341 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
Signal
Measurement point
Measuring instrument
Adjusting element
Specified value
[Adjustment Method]
1) Playback the alignment tape.
2) Short JS401 to Ground.
3) Check that "A P" is indicated on FL display.
4) Adjust so that part A becomes minimized at CH +/–.
5) Write data in EEPROM by pressing PAUSE button.
Monoral model:
6) The display "A P" disappears and then the Adjustment mode
terminates.
Hi-Fi model:
6) The display changes to "A H" and the mode goes to the HiFi
TE
L 13942296513 switching position Adjustment.
CH1
PB RF
CH2
RF SWP
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Playback
Alignment tape: SP color bar portion
CH1: CN270 pin 2
(PB RF)
CH2: CN270 pin 3 (RF SWP)
Oscilloscope
REMOCON CH+/–
A=minimize
A
Fig. 6-2-3
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2-4.

AUDIO SYSTEM ADJUSTMENT

• Adjust both L ch and R ch.
[Connecting Instruments]
Audio oscillator
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"
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Audio line OUTPUT L/R
Audio line INPUT L/R
Audio level meter
or distortion meter
47 k Ω
600 Ω
VTR
Fig. 6-2-4
(S MECHANISM)(9-921-647-11).
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