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7-2
2-1-6.
Adjusting Sequence
Make the electrical adjustment in the following sequence.
Checking power supply
Servo system adjustment
Audio system
adjustment
Tuner system
adjustment
2-3.
SERVO SYSTEM Adjustment
2-3-1.
RF Switching Position Adjustment
(MA-323 Board)
(MA-323 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 2 of CN501
(RF SWP)
CH2: Pin 2 of CN501
(RF SWP)
Measuring Instrument
Oscilloscope
Specified Value
6.5 ± 0.5 H (410 ± 32 µsec)
Adjusting Method:
1) Connect MA-323 board JS140 to the GND for about 1 secont
1) Connect MA-323 board JS140 to the GND for about 1 secont
to activate the RF switching position adjustment mode.
2) Check appear “A P” on FL display.
3) Using the channel + and – buttons, adjust to 6.5 ± 0.5 H.
4) Press the pause button.
3) Using the channel + and – buttons, adjust to 6.5 ± 0.5 H.
4) Press the pause button.
Fig. 7-2-3.
Mode
E-E
Measuring Instrument
Digital voltmeter
–10 V check
Measurement Point
Pin 9 of CN600
Specified Value
–10.3 ±0.8 V
+6 V check
Measurement Point
Pin 7, 8 of CN600
Specified Value
5.9 ± 0.2 V
+13 V check
Measurement Point
Pin 2, 3 of CN600
Specified Value
13.3 ± 0.5 V
+35 V check
Measurement Point
Pin 1 of CN600
Specified Value
38.0 ± 3.0 V
2-2.
POWER SUPPLY ADJUSTMENT
2-2-1.
Power Supply Check
HS-921SF/921SF1 BOARD,
SR-708 BOARD
HS-921SF/921SF1 BOARD,
SR-708 BOARD
Checking Method:
1) Confirm that each voltage meets its specified value.
1) Confirm that each voltage meets its specified value.
2-2-2.
+6 V Adjustment
HS-921SF/921SF1 BOARD,
SR-708 BOARD
HS-921SF/921SF1 BOARD,
SR-708 BOARD
Approx. 1 Vp-p
Approx. 5 Vp-p
V
enargement
CH2
CH1
CH2
CH1
Vertical sync. signal
6.5
±
0.5 H
(410
±
32
µ
sec)
Mode
REC or PB
Measuring Instrument
Digital voltmeter
Measurement Point
Pin 7, 8 of CN201
Adjusting Element
RV201
Specified Value
5.9 ± 0.2 V
(
)
(
)
7-3
2-4.
AUDIO SYSTEM ADJUSTMENTS
• Adjust both Lch and Rch.
[Connection]
Fig. 7-2-4.
2-4-1.
Hi-Fi Audio System Adjustment
(SLV-ED7/ED8)
(SLV-ED7/ED8)
• Set switches and knobs to the following positions to make ad-
justment unless otherwise specified.
INPUT SELECT switch ................... LINE
AUDIO MONITOR .......................... STEREO
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
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-323 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.
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
PB
Signal
Alignment tape SP mode
color bar
color bar
Measurement point
CH1: Pin 2 of CN501
CH2: Pin 1 of CN341
CH2: Pin 1 of CN341
Measuring Instrument
Oscilloscope
Specified Value
Fig. 7-2-5
Adjusting Method:
1) Connect MA-323 board JS140 to the GND for about 1 secont
to activate the RF switching position adjustment mode.
2) Press the record button to activate the AF switching position
adjustment mode.
3) Check appear “A H” on FL display.
4) Using the channels + and – buttons, minimize a chipped por-
4) Using the channels + and – buttons, minimize a chipped por-
tion. At this time, confirm that a noisy sound is not heard.
5) Press the pause button.
Fig. 7-2-5.
2.
Frequency Responce Check
Purpose:
Confirm that the frequency characteristic is within the specifica-
tion.
Confirm that the frequency characteristic is within the specifica-
tion.
Mode
REC and PB (SP mode)
Signal
400 Hz, –7.5 dBs
20 Hz, –7.5 dBs
20 kHz, –7.5 dBs
20 Hz, –7.5 dBs
20 kHz, –7.5 dBs
Measurement point
Audio output terminal
Measurement equipment
Audio level meter
Specified value
0 ± 2 dB
Note:
Tape path adjustment must have been completed.
Confirmation Method:
1) Supply a signal of 400 Hz, –7.5 dBs to both L and R channels
1) Supply a signal of 400 Hz, –7.5 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 indi-
3) Adjust the attenuator so that the audio level meter will indi-
cate –7.5 dBs.
4) Make recording.
5) Set an audio line input signal to 20 Hz and make recording.
6) Set an audio line input signal to 20 kHz and make recording.
7) Playback a recorded portion, and measure output levels at 400
5) Set an audio line input signal to 20 Hz and make recording.
6) Set an audio line input signal to 20 kHz and make recording.
7) Playback a recorded portion, and measure output levels at 400
Hz and 20 Hz and 20 kHz.
8) Confirm that the 20 Hz and 20 kHz playback output level within
a range of the 400 Hz playback output level 0 ± 2 dB.
Audio
generator
generator
Attenuator
600
Ω
47 k
Ω
VCR
Audiolevel 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
7-4
3. Overall Level Characteristic and Distortion Factor
Check
Purpose:
Check the record level, play level, and distortion factor against the
reference input.
Check the record level, play level, and distortion factor against the
reference input.
Mode
REC and PB (SP mode)
Signal
400 Hz, –7.5 dBs
Measurement point
Audio output terminal
Measurement equipment
Audio level meter and
distortion factor meter
distortion factor meter
Specified value
Playback level: –7.5 ± 2 dBs
Distortion factor: 1% or less
Distortion factor: 1% or less
Confirmation Method:
1) Supply an audio signal of 400 Hz, –7.5 dBs simultaneously to
1) Supply an audio signal of 400 Hz, –7.5 dBs simultaneously to
both L and R channels of Audio Line Input.
2) Make recording
3) Play back a recorded portion.
4) Confirm that a playback level is –7.5 ±2 dBs.
5) Confirm that a distortion factor is within 1%.
3) Play back a recorded portion.
4) Confirm that a playback level is –7.5 ±2 dBs.
5) Confirm that a distortion factor is within 1%.
4. Overall S/N Check
Purpose:
Confirm that the S/N is within the specification.
Confirm that the S/N is within the specification.
Mode
REC and PB (SP mode)
Signal
Short
Measurement point
Audio output terminal
Measurement equipment
Audio noise meter
Specified value
–67.5 dBs or less
Confirmation Method:
1) Connect both L and R channels of audio line input to the GND.
2) Start recording.
3) Play the recorded part to confirm that the noise is below –67.5
1) Connect both L and R channels of audio line input to the GND.
2) Start recording.
3) Play the recorded part to confirm that the noise is below –67.5
dBs.
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. (ED7/ED8)
[Adjustment Sequence]
1. ACE Head Adjustment
2. E-E Output Level Check
3. Frequency Responce Check
4. Overall Level Characteristic and Distortion Factor
1. ACE Head Adjustment
2. E-E Output Level Check
3. Frequency Responce Check
4. Overall Level Characteristic and Distortion Factor
Check
5. Overall S/N 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 ± 3 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 ± 3 dBs.
3. Frequency Responce Check
Purpose:
Confirm that the frequency characteristic is within the specifica-
tion.
Confirm that the frequency characteristic is within the specifica-
tion.
Mode
REC and PB (SP mode)
Signal
400 Hz, –30.0 dBs
7 kHz, –30.0 dBs
7 kHz, –30.0 dBs
Measurement point
Audio output terminal
Measurement equipment
Audio level meter
Specified value
1 ± 4 dB
Tape path adjustment must have been completed.
Confirmation Method:
1) Supply a signal of 400 Hz, –30.0 dBs to both L and R chan-
1) Supply a signal of 400 Hz, –30.0 dBs to both L and R chan-
nels 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 indi-
3) Adjust the attenuator so that the audio level meter will indi-
cate –30.0 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
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 1 ± 4 dB.
7-5
7-6 E
4. Overall Level Characteristic and Distortion Factor
Check
Purpose:
Check the record level, play level, and distortion factor against the
reference input.
Check the record level, play level, and distortion factor against the
reference input.
Mode
REC and PB (SP mode)
Signal
400 Hz, –7.5 dBs
Measurement point
Audio output terminal
Measurement equipment
Audio level meter and
distortion factor meter
distortion factor meter
Specified value
Playback level: –7.5 ± 4 dBs
Distortion factor: 4% or less
Distortion factor: 4% or less
Confirmation Method:
1) Supply an audio signal of 400 Hz, –7.5 dBs simultaneously to
1) Supply an audio signal of 400 Hz, –7.5 dBs simultaneously to
both L and R channels of Audio Line Input.
2) Make recording
3) Play back a recorded portion.
4) Confirm that a playback level is –7.5 ± 4 dBs.
5) Confirm that a distortion factor is within 4%.
3) Play back a recorded portion.
4) Confirm that a playback level is –7.5 ± 4 dBs.
5) Confirm that a distortion factor is within 4%.
5. Overall S/N Check
Purpose:
Confirm that the S/N is within the specification.
Confirm that the S/N is within the specification.
Mode
REC and PB (SP mode)
Signal
Short
Measurement point
Audio output terminal
Measurement equipment
Audio noise meter
Specified value
–46.0 dBs or less
Confirmation Method:
1) Connect both L and R channels of audio line input to the GND.
2) Start recording.
3) Play the recorded part to confirm that the noise is below –46.0
1) Connect both L and R channels of audio line input to the GND.
2) Start recording.
3) Play the recorded part to confirm that the noise is below –46.0
dBs.
2-6.
PARTS ARRANGEMENT DIAGRAM FOR ADJUSTMENTS
MA-323 BOARD (Side A)
HS-921SF/921SF1 BOARD (Side A)
SR-708 BOARD (Side A)
RV201
CN201
6V ADJ
1
9
CN501
CN431
1
4
2
1
JS140
RV750
IC750
13
1
US MPX SEP
2-5.
TUNER SYSTEM ADJUSTMENT
[Connection]
Fig. 7-2-6
2-5-1.
Separation Adjustment (SLV-ED8)
Purpose:
Mixed audio signal separate Lch and Rch.
Mixed audio signal separate Lch and Rch.
Mode
E-E
Signal
VIDEO:
color bar
(87.5% modulation)
AUDIO:
L 1 kHz 100% modulation
R no signal
ELECTRIC FIELD:
60–80 dBs/75 W Tem
Measurement point
Pin !™ of IC750
Measurement equipment
Audio level meter
Adjusting Element
RV750
Specified value
–9.9 ± 0.2 dBm
(700 ± 14 mVp-p)
(700 ± 14 mVp-p)
47 k
VTR
Audio level
meter
meter
Up channel
convertor
convertor
RF IN
RV201
CN201
6V ADJ
1
9
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