Af Switching Position Adjustment (Ma-336 Board); Normal Audio System Adjustment; Ace Head Adjustment; E-E Output Level Check - Sony SLV-GA30 Service Manual

QQ
3 7 63 1515 0
1. AF 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
CH1: Pin 3 of CN101
Measurement point
CH2: Pin 1 of CN101
Measuring instrument Oscilloscope
Adjusting element RV201
Specified value Fig. 6-2-5
[Adjustment Method]
1) Playback the alignment tape.
2) Short-circuit between pins 1 and 2 of CN210.
3) Adjust RV201 to minimize a chipped portion. At this time,
confirm that a noisy sound is not heard.
CH2
RF SWP
OK
CH1
TE
REC AFM
L 13942296513
NG
Should be minimized
Fig. 6-2-5
www
.
http://www.xiaoyu163.com
RF signal dropout
x ao
y
i
http://www.xiaoyu163.com
8
2-4-2.

Normal Audio System Adjustment

• Make adjustment in the SP mode unless otherwise specified. Use
a normal VHS cassette for an adjustment tape.
• Set AUDIO MONITOR to normal.

1. ACE Head Adjustment

Refer to the VHS mechanical adjustment manual
MECHANISM) (9-921-647-11).

2. E-E Output Level Check

[Adjustment purpose]
Confirm that the output level adjust the reference input is within the
specification.
Mode
Signal
Measurement point
Measuring instrument
Specified value
[Check Method]
1) Input signal of 400 Hz and –7.5 dBs to the CJ461 L/R.
2) Check that the audio output level is –7.5 ± 2 dBs.

3. Recording Bias Check

[Adjustment purpose]
Confirm that the frequency characteristic is within the specification.
Mode
Signal

Q Q

3 6 7 1 3
Measurement point
Measuring instrument
Specified value
Note: Tape path adjustment must have been completed.
[Confirmation Method]
1) Supply a signal of 400 Hz, –27.5 dBs to both L and R channels
of Audio Line Input.
2) Connect the audio level meter to the Audio Line Output.
3) Adjust the attenuator so that the audio level meter will indicate
–27.5 dBs.
4) Make recording in the SP mode.
5) Set an audio line input signal to 7 kHz and make recording.
6) Playback a recorded portion, and measure output levels at 400
Hz and 7 kHz.
7) Confirm that the 7 kHz playback output level within a range of
the 400 Hz playback output level 0 ± 3 dB.
u163
.
6-4
2 9 9 4 2 8
E-E
400 Hz, –7.5 dBs
CJ461 L/R
Audio level meter
–7.5 ± 2 dBs
REC and PB (SP mode)
400 Hz, –27.5 dBs
7 kHz, –27.5 dBs
1 5 0 5 8 2 9 9 4
Audio output terminal
Audio level meter
0 ± 3 dB
m
co
9 9
(S
2 8 9 9