Servo System Adjustment; Rf Switching Position Adjustment; Audio System Adjustments; Hi-Fi Audio System Adjustment - Sony SLV-ED8KR Service Manual

3-3.

SERVO SYSTEM ADJUSTMENT

3-3-1.

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 CHANNEL + and – buttons, adjust to 6.5 ± 0.5 H.
4) Press the PAUSE button.
CH1
CH2
enargement
CH1
6.5 ± 0.5 H
CH2
(410 ± 32 µsec)
Fig. 7-3-3.
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 (410 ± 32 µsec)
Approx. 1 Vp-p
Approx. 5 Vp-p
V
Vertical sync. signal
3-4.

AUDIO SYSTEM ADJUSTMENTS

• Adjust both Lch and Rch.
[Connection]
Audio
generator
600 Ω
Attenuator
AUDIO LINE IN
Feed signal both
channelssimultaneously.
3-4-1.

Hi-Fi Audio System Adjustment

• Set switches and knobs to the following positions to make ad-
justment unless otherwise specified.
INPUT SELECT switch ..................... LINE
AUDIO MONITOR ............................ STEREO
[Adjustment Sequence]

1. AF Switching Position Adjustment

2. Frequency Responce Check
3. Overall Level Characteristic and Distortion Factor
Check
4. Overall S/N Check
1. AF Switching Position Adjustment (MA-325 Board)
Purpose:
Adjust the interval between A CH and B CH of tape playback
output. Improve the interchangeability with other tapes and sets.
When it is out of order, noisy sound is increased and big noise is
heard.
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) Press the PAUSE button to activate the AF switching position
adjustment mode.
3) Check appear "HFxx" on FL display.
4) Using the CHANNEL + and – buttons, minimize a chipped
portion. At this time, confirm that a noisy sound is not heard.
5) Press the PAUSE button.
6) Press the EJECT button.
7-3
Audiolevel meter or
distortion meter
47 kΩ
VCR
AUDIO LINE OUT
Fig. 7-3-4.
PB
Alignment tape SP mode
color bar
CH2: Pin 1 of CN341
CH1: Pin 3 of CN501
Oscilloscope
Fig. 7-3-5