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6-2
2-1-6.
Adjusting Sequence
Make the electrical adjustment in the following sequence.
Checking power supply
Servo system adjustment
Audio system adjustment
2-3.
SERVO SYSTEM ADJUSTMENTS
2-3-1.
RF Switching Position Adjustment
(MA-366 Board)
(MA-366 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.
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
PB
Signal
Alignment tape SP mode
color bar
color bar
Measurement Point
CH1: VIDEO LINE OUT
CH2: Pin 3 of CN202
(V SWP)
CH2: Pin 3 of CN202
(V SWP)
Measuring Instrument
Oscilloscope
Adjusting Element
RV101
Specified Value
6.5 ± 1.0 H (416 ± 60 µsec)
PAL
PAL
6.5 ± 1.0 H (413 ± 60 µsec)
NTSC
NTSC
Adjusting Method:
1) Connect MA-366 board JS401 to the GND for about 1 second
1) Connect MA-366 board JS401 to the GND for about 1 second
to activate the RF switching position adjustment mode.
2) Check that D403 and D405 mutually flash on and off quickly.
3) Check that switching position is 6.5 ± 1.0 H.
4) If not meet the specified value, turn RV101 and repeat steps 3
3) Check that switching position is 6.5 ± 1.0 H.
4) If not meet the specified value, turn RV101 and repeat steps 3
to 4.
Fig. 6-2-3.
Mode
E-E
Measuring Instrument
Digital voltmeter
+12 V check
Measurement Point
Collector of Q604
Specified Value
12.0 ± 0.3 V
+5 V check
Measurement Point
Pin 7 of CN001
Specified Value
5.0 ± 0.25 V
+9 V check
Measurement Point
Emitter of Q604
Specified Value
9.0 ± 0.3 V
MTR12 V check
Measurement Point
Pin 4 of CN001
Specified Value
12.0 ± 0.3 V
2-2.
POWER SUPPLY ADJUSTMENTS
2-2-1.
Power Supply Check
(MA-366 Board)
(MA-366 Board)
Checking Method:
1) Confirm that each voltage meets its specified value.
1) Confirm that each voltage meets its specified value.
Approx. 1 Vp-p
Approx. 5 Vp-p
V
enargement
CH2
CH1
CH2
CH1
Vertical sync. signal
6.5
±
1.0 H
(416
±
60
µ
sec) PAL
(413
±
60
µ
sec) NTSC
6-3
6-4 E
2-4.
AUDIO SYSTEM ADJUSTMENTS
• Adjust both Lch and Rch.
[Connection]
Fig. 6-2-4.
2-4-1.
Hi-Fi Audio System Adjustment
(SLV-GF85/SP100)
(SLV-GF85/SP100)
• Set switches and knobs to the following positions to make ad-
justment unless otherwise specified.
AUDIO MONITOR .......................... STEREO
AUDIO MONITOR .......................... STEREO
1.
AF Switching Position Adjustment (MA-366 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, noisy sound is increased and big noise is
heard.
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, noisy sound is increased and big noise is
heard.
Mode
PB
Signal
Alignment tape SP mode color
bar
Measurement point
CH1: Pin 3 of CN202
CH2: Pin 1 of CN202
CH2: Pin 1 of CN202
Measuring Instrument
Oscilloscope
Adjusting Element
RV102
Specified Value
Fig. 6-2-5
Adjusting Method:
1) Connect MA-366 board JS401 to the GND for about 1 second
1) Connect MA-366 board JS401 to the GND for about 1 second
to activate the RF switching position adjustment mode.
2) Check that D403 and D405 mutually flash on and off quickly.
3) Adjust RV102 to minimize a chipped portion.
3) Adjust RV102 to minimize a chipped portion.
At the time, confirm that a noisy sound is not heard.
Audio
generator
generator
Attenuator
600
Ω
47 k
Ω
VCR
Audio level meter or
distortion meter
AUDIO LINE OUT
AUDIO LINE IN
Feed signal both
channelssimultaneously.
Feed signal both
channelssimultaneously.
CH2
CH1
RF SWP
RF SWP
OK
NG
Fig. 6-2-5.
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.
[Adjustment Sequence]
1. ACE Head Adjustment
2. E-E Output Level Check
1. ACE Head Adjustment
2. E-E Output Level Check
1. ACE Head Adjustment
Refer to the service manual of VHS MECHANICAL
ADJUSTMENT
ADJUSTMENT
VI
.
2. E-E Output Level Check
Purpose:
Confirm that the output level against the reference input is within
the specification.
Confirm that the output level against the reference input is within
the specification.
Mode
E-E
Signal
L, R: 400 Hz, –7.5 dBs
Measurement point
Audio output terminal
Measurement equipment
Audio level meter
Specified value
–7.5 ± 2 dBs
Confirmation Method:
1) Simultaneously input a signal of 400 Hz, –7.5 dBs to both L
1) Simultaneously input a signal of 400 Hz, –7.5 dBs to both L
and R channels of Audio Line Input.
2) Confirm that the audio output level is –7.5 ± 2 dBs.
2-5.
PARTS ARRANGEMENT DIAGRAM FOR ADJUSTMENTS
MA-366 BOARD (side A)
Q604
E
C
B
CN001
1
7
CN202
4
1
RV101
RF SWP
RV102
AF SWP
JS401
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