Sony SLV-LX80S Service Manual ▷ View online
6-2
2-1-5.
Input/Output Levels and Impedance
Video input: LINE IN
Input signal: 1 Vp-p, 75 ohms, unbalanced,
sync negative
sync negative
Video output: LINE OUT
Output signal: 1 Vp-p, 75 ohms, unbalanced,
sync negative
sync negative
Audio input: LINE IN
Input level: –7.5 dBs
(0 dBs= 0.775 Vrms)
Input impedance: more than 47 kilohms
(0 dBs= 0.775 Vrms)
Input impedance: more than 47 kilohms
Audio output:LINE OUT
Standard level: –7.5 dBs at load impedance 47
kilohms
Output impedance: less than 10 kilohms
kilohms
Output impedance: less than 10 kilohms
2-1-6.
Adjustment Sequence
The adjustments should be performed in the following sequence.
2-2.
POWER SUPPLY CHECK
2-2-1.
Output Voltage Check (MA-397 Board)
Mode
STANDBY
+30 V Check
Measurement point
C671 3
Specified value
31.0 to 39.0 V
–11 V Check
Measurement point
Anode of D420
Specified value
–12.5 to – 9.5 V
D+6 V Check
Measurement point
Collector of Q674
Specified value
5.56 to 6.25 V
Mode
E-E
Measuring Instrument
Digital voltmeter
SW+12 V Check
Measurement point
IC660 pin 2
Specified value
11.7 to 12.3 V
SW+5 V Check
Measurement point
Emitter of Q662
Specified value
4.8 to 5.4 V
MTR12 V Check
Measurement point
Collector of Q600
Specified value
12.5 to 14.5 V
F Check
Measurement point
ND420 e; to 1
Specified value
2.0 to 5.0V
[Check Method]
1)
1)
Each of these supply voltages must meet its specified value.
Power Supply Check
Servo/Video System Adjustments
Audio System Adjustments
6-3
2-3.
SERVO SYSTEM CHECK
2-3-1.
RF Switching Position Adjustment
(MA-397 Board)
(MA-397 Board)
[Adjustment Purpose]
To adjust the link of the A-ch and B-ch of the tape playback outputs.
To make the unit compatible with other tapes and units. If this
specification is not satisfied, the link will appear on the screen and
the screen will be disrupted, etc.
To adjust the link of the A-ch and B-ch of the tape playback outputs.
To make the unit compatible with other tapes and units. If this
specification is not satisfied, the link will appear on the screen and
the screen will be disrupted, etc.
Mode
Playback
Signal
Alignment tape: SP color bar portion
Measurement point
CH1: CN270 pin 2 (PB RF)
CH2: CN270 pin 3 (RF SWP)
CH2: CN270 pin 3 (RF SWP)
Measuring instrument
Oscilloscope
Adjusting element
Remote Commander CH+/–
Specified value
A=minimize
[Adjustment Method]
1)
1)
Playback the alignment tape.
2)
Short JS401 to Ground.
3)
Check that “A P” is indicated on FL display.
4)
Adjust so that part A becomes minimized at CH +/–.
5)
Write data in EEPROM by pressing PAUSE button.
Monoral model:
6)
6)
The display “A P” disappears and then the Adjustment mode
terminates.
terminates.
Hi-Fi model:
6)
6)
The display changes to “A H” and the mode goes to the HiFi
switching position Adjustment.(2-4-2.)
switching position Adjustment.(2-4-2.)
Fig. 6-2-3
2-4.
AUDIO SYSTEM ADJUSTMENT
• Adjust both L ch and R ch.
[Connecting Instruments]
[Connecting Instruments]
Fig. 6-2-4
2-4-1.
Hi-Fi Audio System Adjustment
(Hi-Fi model only)
(Hi-Fi model only)
• Perform the adjustment setting the switch on the following
positions.
• AUDIO MONITOR
STEREO
[Adjustment Method]
1.
1.
ACE head adjustment.....Refer to the VHS mechanical
adjustment manual (S MECHANISM)(9-921-647-11).
adjustment manual (S MECHANISM)(9-921-647-11).
2.
E-E output level check
3.
“Recording Bias Adjustment”
Audio line OUTPUT L/R
Audio line INPUT L/R
Audio oscillator
Attenuator
600
Ω
Audio level meter
or distortion meter
or distortion meter
47 k
Ω
VTR
CH1
PB RF
CH2
RF SWP
A
6-4
2-4-3.
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.
2-4-4.
Audio Level and Distortion Check
[Adjustment purpose]
Confirm that the audio level and distortion is within the specification.
Mode
REC and PB (SP mode)
Signal
400 Hz, –7.5 dBs
Measurement point
Audio output terminal
Measuring instrument
Audio level meter and distortion
meter
meter
Specified value
PB level
: –7.5
±
2dBs (HIFI)
PB level
: –7.5
±
3dBs (MONO)
Distortion
: less than 1% (HIFI)
Distortion
: less than 4% (MONO)
[Confirmation Method]
1)
1)
Supply a signal of 400 Hz, –7.5 dBs to both L and R channels
of Audio Line Input.
of Audio Line Input.
2)
Record the tape.
3)
Playback a recorded portion of the tape.
4)
Confirm that the playback output level of audio level meter is
within of range –7.5
within of range –7.5
±
2dBs for HIFI and –7.5
±
3dBs for MONO.
5)
Confirm that the output of distortion meter is less than 1% for
HIFI and 4% for MONO.
HIFI and 4% for MONO.
2-4-2.
HiFi Switching Position Adjustment
(MA-397 Board)
(MA-397 Board)
[Adjustment Purpose]
To adjust the link of the A-ch and B-ch of the tape playback outputs.
To make the unit compatible with other tapes and units. If this
specification is not satisfied, the link will appear on the screen and
the screen will be disrupted, etc.
To adjust the link of the A-ch and B-ch of the tape playback outputs.
To make the unit compatible with other tapes and units. If this
specification is not satisfied, the link will appear on the screen and
the screen will be disrupted, etc.
Mode
Playback
Signal
Alignment tape: SP color bar portion
Measurement point
CH1: Pin 1 of CN270 (HF ADJ)
CH2: Pin 3 of CN270 (RF SWP)
CH2: Pin 3 of CN270 (RF SWP)
Measuring instrument
Oscilloscope
Adjusting element
Remote Commander CH +/–
Specified value
B=minimize
[Adjustment Method]
1)
1)
Check that “A H” is indicated on FL display.
2)
Adjust so that part B becomes minimized at CH +/–.
3)
Write data EEPROM by pressing PAUSE button.
4)
Check that “A H” indicator turns off.
5)
If “A H” indicator is still on, restart RF switching position
Adjustment from the beginning.
Adjustment from the beginning.
Fig. 6-2-5
CH1
HFADJ
CH2
RF SWP
B
2-4-5.
Audio Noise Check
[Adjustment purpose]
Confirm that the noise level is within the specification.
Confirm that the noise level is within the specification.
Mode
REC and PB (SP mode)
Signal
No signal input
Measurement point
Audio output terminal
Measuring instrument
Audio level meter
Specified value
Less than –67,5dBs (HIFI)
Less than –45.5dBs (MONO)
Less than –45.5dBs (MONO)
[Confirmation method]
1)
1)
Audio line input L and R channels are shorted to the ground.
2)
Record the tape.
3)
Playback a recorded portion of the tape.
4)
Confirm that the output level is less than –67.5dBs for HIFI
and –45.5dBs for MONO.
and –45.5dBs for MONO.
2-4-6.
ACE Head Adjustment
Refer to the VHS mechanical adjustment manual
(S
MECHANISM) (9-921-647-11).
2-4-7.
E-E Output Level Check
[Adjustment purpose]
Confirm that the output level adjust the reference input is within the
specification.
Confirm that the output level adjust the reference input is within the
specification.
Mode
E-E
Signal
400 Hz, –7.5 dBs
Measurement point
CNJ561 L/R
Measuring instrument
Audio level meter
Specified value
–7.5
±
2 dBs
[Check Method]
1)
1)
Input signal of 400 Hz and –7.5 dBs to the CNJ561 L/R.
2)
Check that the audio output level is –7.5
±
2 dBs.
2-4-8.
Frequency Response Check
[Adjustment purpose]
Confirm that the frequency characteristic is within the specification.
Confirm that the frequency characteristic is within the specification.
Mode
REC and PB (SP mode)
Signal
400 Hz, –17.5 dBs
7 kHz, –17.5 dBs
7 kHz, –17.5 dBs
Measurement point
CNJ561 L/R
Measuring instrument
Audio level meter
Specified value
0
±
3 dB
Note:
Tape path adjustment must have been completed.
[Confirmation Method]
1)
1)
Supply a signal of 400 Hz, –17.5 dBs to CNJ561 L/R.
2)
Connect the audio level meter to CNJ561 L/R.
3)
Adjust the attenuator so that the audio level meter will indicate
–17.5 dBs.
–17.5 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
Hz and 7 kHz.
Hz and 7 kHz.
7)
Confirm that the 7 kHz playback output level within a range of
the 400 Hz playback output level 0
the 400 Hz playback output level 0
±
3 dB.
SLV-LX80S
2-5.
ADJUSTING PARTS LOCATION DIAGRAM
MA-397 BOARD
(CONDUCTOR SIDE)
(CONDUCTOR SIDE)
CNJ561
VIDEO/AUDIO LINE
IN/OUT
CN270
RF/HF SWP
4
1
Q600
Q674
C671
+30 V
+12V
D420
-11V
+6V
SW5V
MTR12 V
B
E
B
E
+
1
4
IC660
JS401
ADJ
1
30
ND420
6-5E
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