Sony LX70S, RMT-V293A, RMT-V294A, LX60S, LX40, LX50 Servo System Check, Audio System Adjustment, Vtr

2-3. SERVO SYSTEM CHECK

2-3-1. RF Switching Position Adjustment (MA-405 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: CN270 pin 2 (PB RF)
	CH2: CN270 pin 3 (RF SWP)
Measuring instrument	Oscilloscope
Adjusting element	Remote Commander CH+/–
Specified value	A=minimize

[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 switching position Adjustment.(2-4-2.)

2-4. AUDIO SYSTEM ADJUSTMENT

•Adjust both L ch and R ch.

[Connecting Instruments]
Audio line OUTPUT L/R
Audio line INPUT L/R	Audio level meter
Audio oscillator	or distortion meter
	47 kΩ
600 Ω
Attenuator
VTR
Fig. 6-2-4

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 (S MECHANISM)(9-921-647-11).

2.E-E output level check

3.“Recording Bias Adjustment”

A

CH1

PB RF

CH2

RF SWP

Fig. 6-2-3

6-3