Sony SLV-AV100B / SLV-AV100NP / SLV-AV100UX / SLV-AV100VC Service Manual ▷ View online
8-9
2-7. AUDIO SYSTEM ADJUSTMENTS
• For the adjustment of the audio system, perform in the SP mode if
there is no special notes. Use the alignment tape.
• Adjust both LCH and RCH.
[Connecting Instruments]
[Connecting Instruments]
2-7-1. AF Switching Position Adjustment (RP-213 Board)
[Adjustment Object]
To adjust the link of the Ach and Bch of the tape playback outputs.
If this specification is not satisfied, the noise will increase and cracking
sounds will be produced.
To adjust the link of the Ach and Bch of the tape playback outputs.
If this specification is not satisfied, the noise will increase and cracking
sounds will be produced.
Mode
Playback
Signal
Alignment tape
Measurement
CH1 : JL707(RP-213 board)
point
CH2 : CN502 pin3(RP SWP)(RP-213 board)
Measuring
Oscilloscope
instrument
Adjustment
PROGRAM +/– button
element
Specified
No dropouts in the RF signal
value
[Adjusting Method]
1) Playback the alignment tape. short the adjustment land JL207
1) Playback the alignment tape. short the adjustment land JL207
(MA-283 board) to the ground for 300 msec or more to enter the
RF SWP adjustment mode.
RF SWP adjustment mode.
2) Verify that "AD RF xx (xx : data value)" are indicated on the
display tube.
3) Press REC button.
4) Verify that "AD HF xx (xx : data value)" are indicated on the
4) Verify that "AD HF xx (xx : data value)" are indicated on the
display tube.
5) Use PROGRAM +/– buttons to adjust so that the portion A is
minimized.
6) Press PAUSE and write the data.
Fig. 8-2-14.
RF signal dropout (Should be minimized)
A
A
OK
NG
Note :
The RF SWP adjustment should be completed before
performing this adjustment.
performing this adjustment.
CH1
JL 707
JL 707
CH2
CN502 pin
CN502 pin
3
(RF SWP)
Audio
Oscillator
Oscillator
Attenuator
AUDIO
LINE IN
LINE IN
AUDIO
TAPE/MD
REC OUT
TAPE/MD
REC OUT
47k
Ω
VCR
Audio Level Meter
or Distortion Meter
or Distortion Meter
Fig. 8-2-13.
•
Hi-Fi Audio System Adjustment
Perform the adjustment setting the switches and controls on the
following positions if there is no special indications.
•
following positions if there is no special indications.
•
AUDIO
switch ............................................................... LINE
•
AUDIO MONITOR
switch * ....................................... Stereo
* : Remote commander
600
Ω
8-10
2-7-2. VCO f
0
Adjustment (MA-283 Board)
[Adjustment Object]
To attain Hi-Fi audio compatibility.
If this apecification is not satisfied, the sound will be distorted.
To attain Hi-Fi audio compatibility.
If this apecification is not satisfied, the sound will be distorted.
Mode
Recording
Signal
No-signal
Measuring
Frequency counter
instrument
Measurement
CN503 pin1
point
1.4MHz adjustment
Adjustment
RV521 (Lch)
element
Specified
1400±1kHz
value
1.8MHz adjustment
Adjustment
RV531 (Rch)
element
Specified
1800±1kHz
value
Note :
Connect the frequency counter through the buffer amplifier
(oscilloscope, etc) with high input resistance (1MΩ or more)
and low capacity (10pF or less).
(oscilloscope, etc) with high input resistance (1MΩ or more)
and low capacity (10pF or less).
[Adjusting Method]
1) Connect pin4 of CN503 to the ground.
2) Set TRACKING button on the remote commander to AUTO.
3) Adjust RV521 so as to obtain 1400±1kHz.
4) Set TRACKING button on the remote commander to MANUAL.
5) Adjust RV531 so as to obtain 1800±1kHz.
1) Connect pin4 of CN503 to the ground.
2) Set TRACKING button on the remote commander to AUTO.
3) Adjust RV521 so as to obtain 1400±1kHz.
4) Set TRACKING button on the remote commander to MANUAL.
5) Adjust RV531 so as to obtain 1800±1kHz.
2-7-3. Deviation Check (MA-283 Board)
Mode
Recording
Signal
400Hz, –7.5dBs : CN502 pin!£!∞
Measurement
CN503 pin1
point
Measuring
Modulation Analyzer
instrument
Specified
50±50kHz
value
[Check Method]
1) Connect pin4 of CN503 to the ground.
2) Set TRACKING button on the remote commander to AUTO.
3) Verify that the output signal satisfies the specification.
4) Set TRACKING button on the remote commander to MANUAL.
5) Verify that the output signal satisfies the specification.
1) Connect pin4 of CN503 to the ground.
2) Set TRACKING button on the remote commander to AUTO.
3) Verify that the output signal satisfies the specification.
4) Set TRACKING button on the remote commander to MANUAL.
5) Verify that the output signal satisfies the specification.
2-7-4. Band Pass Filter f
0
Adjustment (MA-283 Board)
[Adjustment Object]
To separate the carrier accurately and ensure that the filter for cutting
the video signal functions normally.
If this specification is not satisfied, the sound will be distored.
To separate the carrier accurately and ensure that the filter for cutting
the video signal functions normally.
If this specification is not satisfied, the sound will be distored.
Mode
Playback
Signal
1,608MHz, 200mVp-p : CN503 pin3
Measurement
CN503 pin1
point
Measuring
Oscilloscope
instrument
Adjustment
RV541
element
Specified
Adjust the A and B amplitudes to the same level.
value
(A–B=±2mVp-p)
[Adjusting Method]
1) Connect pin4 of CN503 to the ground.
2) Set TRACKING button on the remote commander to AUTO.
1) Connect pin4 of CN503 to the ground.
2) Set TRACKING button on the remote commander to AUTO.
(Lch signal output)
3) Assume the output value at this time as A.
4) Set TRACKING button on the remote commander to MANUAL.
4) Set TRACKING button on the remote commander to MANUAL.
(Rch signal output)
5) Assume the output value at this time as B. Adjust RV541 so that A
is equal to B.
8-11
2-7-7. E-E Output Level Check
Mode
E-E
Signal
400Hz, – 7.5dBs : Audio line in
Measurement
Audio tape/MD REC out terminal
point
Measuring
Audio level meter
instrument
Specified
– 7.5±2dBs
value
[Check Method]
1) Input signal of 400Hz and –7.5dBs to the L and R channel of the
1) Input signal of 400Hz and –7.5dBs to the L and R channel of the
audio input at the same time.
2) Check that the audio output level is –7.5±2dBs.
2-7-8. Overall Output Level and Distortion Factor Check
Mode
Self-record playback
Signal
400Hz, –7.5dBs : Audio Line Input
terminals, left and right
Measurement
Audio tape/MD REC out terminal
point
Measuring
Audio level meter and Distortion meter
instrument
Specified
Playback Level : –7.5±3dBs
value
Distortion : 4.0% or less
[Check Method]
1) Record signal.
2) Playback the recorded portion.
3) Check that the output level is –7.5±3dBs.
4) Check that the distortion factor is 4.0% or less on the left and
1) Record signal.
2) Playback the recorded portion.
3) Check that the output level is –7.5±3dBs.
4) Check that the distortion factor is 4.0% or less on the left and
right side.
2-7-9. Overall Noise Level Check
Mode
Self-record playback
Signal
No signal (Insert a shorting plug into the
Audio Line Input jacks, left and right.)
Measurement
Audio tape/MD REC out terminal
point
Measuring
Audio level meter
instrument
Specified
–46dBs or less
value
[Check Method]
1) Record.
2) Playback recorded portion.
3) Check that noise level is –46dBs or less on the left and right side.
1) Record.
2) Playback recorded portion.
3) Check that noise level is –46dBs or less on the left and right side.
•
Normal Audio System Adjustment
• Adjust in the SP mode if there is no special indications.
• Perform the adjustment setting the switch on the following positions.
•
• Perform the adjustment setting the switch on the following positions.
•
AUDIO
switch ............................................................... LINE
•
AUDIO MONITOR
switch * ............................ NORMAL*
1
*1 : No indicates on the display window indicator and monitor TV.
[Adjustment Sequence]
1) ACE head adjustment ....... Refer to the VHS mechanical part
1) ACE head adjustment ....... Refer to the VHS mechanical part
adjustment manual IV
2) Recording bias check
3) E-E output level check
4) Overall output level and distortion factor check.
5) Overall noise level check.
3) E-E output level check
4) Overall output level and distortion factor check.
5) Overall noise level check.
2-7-5. ACE Head Adjustment
Refer to the "VHS Mechanical adjustment manual IV"
(9-973-623-11).
(9-973-623-11).
2-7-6. Recording Bias Check (MA-283 Board)
Mode
Self-record playback
Signal
400Hz, – 27.5dBs Audio line in
7kHz, – 27.5dBs (L or R)
Measurement
Audio tape/MD REC out terminal
point
Measuring
Audio level meter
instrument
Specified
0±3dBs
value
[Adjusting Method]
1) Supply a signal of 400Hz, –27.5dBs to 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 indicate
1) Supply a signal of 400Hz, –27.5dBs to 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 indicate
–27.5dBs.
4) Make recording in the SP mode.
5) Set an audio line input signal to 7kHz and make recording.
6) Playback a recorded portion, and measure output levels at 400Hz
5) Set an audio line input signal to 7kHz and make recording.
6) Playback a recorded portion, and measure output levels at 400Hz
and 7kHz.
7) Confirm that the 7kHz playback output levels within a range of
the 400Hz playback output level 0±3dB.
8-12
2-8. ADJUSTMENT PARTS LOCATION DIAGRAMS
E
4
1
CN503
E
Q352
IC301
1
17
34
18
RV521 RV531 RV541
VCO fo
( L )
( L )
VCO fo
( R )
( R )
BPF fo
IC151
24
25
40
80
65
1
1
4
1
4
41
64
JL207
CN907
CN502
JL707
MA-283 BOARD
RP-213 BOARD
: Parts on conductor side.
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