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.
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
Specified value Playback level: –7.5 ± 4.0 dBs
Distortion factor: 4% or less
Confirmation Method:
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 ± 4.0 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.
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
dBs.
2-6. PARTS ARRANGEMENT DIAGRAM FOR ADJUSTMENTS
MA-350 BOARD (Side A)
HS-921SF/921SF1 BOARD (Side A) GK-12 BOARD (Side A)
SR-708/718 BOARD (Side A)
2-5. TUNER SYSTEM ADJUSTMENT
[Connection]
Fig. 7-2-6
2-5-1. Separation Adjustment (SLV-EZ70:AS)
Purpose:
Mixed audio signal separate Lch and Rch.
Mode E-E
Signal VIDEO:
color bar
(White 100% modulation)
AUDIO:
L NONE
R 1 kHz 60% modulation
ELECTRIC FIELD:
60–80 dBs/75 Ω Term
Measurement point Audio output terminal
Measurement equipment Audio level meter
Adjusting Element RV001
Specified value minimum
47 kΩ
VCR
Audio level
meter
Up channel
convertor
RF IN
AUDIO LINE OUT
L
R
CN203
4
1
JS450
RV201
CN201
6V ADJ
1
9
VR201
CN201
6V ADJ
19
RV001
IC001
1
11
33
34
44
22
12
23
SEPARATION ADJ
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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