Sony SLV-E830B, Service Manual

Page: 57 / 129

2-6. ADJUSTMENT PARTS LOCATION DIAGRAM
RP-231 BOARD (Conductor side)
MA-316 BOARD (Conductor side)
6-6E
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 (75
Ω
terminated)
[Check Method]
1)
Check that the playback level satisfies the specified value.
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]
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 ” (9-921-647-
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
Measurement point CN500 (LINE 1) Pin
3
(L), Pin
1
(R)
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)
Measurement point CN500 (LINE 1) Pin
3
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
A
H
(CN500 or J500)
Audio line OUTPUT L/R
(J480)
Audio line
INPUT L/R
Audio
oscillator
Attenuator
600
Ω
VTR
47 k
Ω
Audio level meter
or distortion meter
1 5
CN261
1
2
CN341
RF/AF
Switching Position
J500
AUDIO OUT
CN500
LINE 1
VCC 12V
IC530
4 1
D702
Tuner
30V
SYNC AGC
White/Dark Clips
REC Y Level
REC C Level
25 24
1
80
65
64
41
40
Q211
E
X'tal OSC
IC160
D160
D5V
20
21
2
1
IC201