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2-4-6.
Playback Level Check (MA-316 Board)
Mode
Playback
Signal Alignment
Alignment tape : SP mode color bar
portion
Measurement point
Video LINE OUT terminal
Measuring instrument
Oscilloscope
Specified value
A=1.0 ± 0.1Vp-p (75Ω terminated)
[Check Method]
1) Check that the playback level satisfies the specified value.
A
H
Fig. 6-2-10
2-5.
AUDIO SYSTEM ADJUSTMENT
• For the adjustment of the audio system, perform in the SP mode
if there is no special notes. Use the alignment tape.
[Connecting Instruments]
(CN500 or J500)
Audio line OUTPUT L/R
(J480)
Audio line
INPUT L/R
Audio level meter
Audio
or distortion meter
oscillator
47 k Ω
600 Ω
Attenuator
VTR
Fig. 6-2-11
• Adjust in the SP mode if there is no special indications.
• Perform the adjustment setting the switch on the following
positions.
• INPUT SELECT switch ........................................... LINE IN 2
[Adjustment Method]
1.
ACE head adjustment.....Refer to the VHS mechanical
adjustment manual
.
2.
E-E output level check
3.
Overall Output level and distortion factor check
4.
Overall noise level check.
2-5-1.
ACE Head Adjustment
Refer to the "VHS mechanical adjustment manual
11).
2-5-2.
E-E Output Level Check
Mode
E-E
Signal
400Hz, –7.5dBs : J480 (LINE IN 2)
on FR-128 board
Measurement point
J500 (AUDIO OUT), CN500 (LINE 1)
Measuring instrument
Audio level meter
Specified value
J500 : –7.5 ± 2.0dBs,
CN500 : –6.3 ± 2.0dBs
[Check Method]
1)
Input signal of 400Hz and –7.5dBs to J480 (LINE IN 2).
2)
Check that the audio output level is the specified value.
2-5-3.
Overall Output Level and Distortion Factor
Check
Mode
Self-record playback
Signal
400Hz, –7.5dBs : J480 (LINE IN 2)
on FR-128 board
CN500 (LINE 1) Pin 3 (L), Pin 1 (R)
Measurement point
Measuring instrument
Audio level meter and Distortion
meter
Specified value
Playback Level: –6.3 ± 3dBs
Distortion: 4.0% or less
[Check Method]
1)
Input signal of 400Hz and –7.5dBs to J480 (LINE IN 2).
2)
Record signal.
3)
Playback the recorded portion.
4)
Check that the output level is –6.3 ± 3dBs.
5)
Check that the distortion factor is 4.0% or less.
2-5-4.
Overall Noise Level Check
Mode
Self-record playback
Signal
No signal (Insert a shorting plug into
the Audio LINE IN terminal)
CN500 (LINE 1) Pin 3
Measurement point
Measuring instrument
Audio level meter (IHF-A weighing
filter is used)
Specified value
– 45.5dBs or less
[Check Method]
1)
Record.
2)
Playback recorded portion.
3)
Check that noise level is – 45.5dBs or less.
6-5
2-6.
ADJUSTMENT PARTS LOCATION DIAGRAM
" (9-921-647-
RP-231 BOARD (Conductor side)
1
CN261
MA-316 BOARD (Conductor side)
J500
AUDIO OUT
25
24
40
IC201
41
64
65
Q211
E
X'tal OSC
5
2
1
CN341
RF/AF
Switching Position
2
20
1
21
CN500
LINE 1
SYNC AGC
White/Dark Clips
1
REC Y Level
REC C Level
80
IC160
D160
D5V
6-6E
D702
IC530
VCC 12V
4
1
Tuner
30V
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