Sony SLV-M10HF Service Manual ▷ View online
6-3
2-3.
SERVO SYSTEM CHECK
Unless otherwise specified, set the switches to the following
positions.
positions.
•
INPUT SELECT switch ........................................... LINE 1
•
TAPE SPEED
switch ..................... SP (Remote commander)
2-3-1. RF Switching Position/
AF Switching Position Adjustments
(MA-335 Board)
(MA-335 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: Video LINE OUT
(RF switching position)
CN341 pin 1 (HF ADJ)
(AF switching position)
CN341 pin 1 (HF ADJ)
(AF switching position)
CH2: CN261 pin 3 (RF SWP)
Measuring instrument
Oscilloscope
Specified value
6.5 ± 0.5H (410 ± 32
µ
sec)
[Adjustment Method]
1)
1)
Short-circuit between JS161 and ground for about 1 second to
activate the RF switching position adjustment mode.
activate the RF switching position adjustment mode.
2)
Check that “AP” is indicated on FL display.
3)
Using the channel + and – buttons, adjust to 410 ± 32
µ
sec (6.5
± 0.5H).
4)
Press the PAUSE button. (Adjustment is over for mono models.)
5)
The set goes to the AF switching position adjustment mode.
Fig. 6-2-3.
6)
Check that “AH” is indicated on FL display.
7)
Using the channel + and – buttons, minimize a chipped portion.
At this time, confirm that a noisy sound is not heard.
At this time, confirm that a noisy sound is not heard.
8)
Press the PAUSE button.
9)
Check that “AH” indication is disappeared. When it is not
disappeared, repeat from the item 1).
disappeared, repeat from the item 1).
10) Press the STOP button.
11) Press the EJECT button.
11) Press the EJECT button.
Fig. 6-2-4.
CN261 pin
3
6.5
±
0.5H
CH1
CH2
CH1
CH2
Enlarrgement
Vertical sync. signal
Approx.
5Vp-p
5Vp-p
Approx.
1Vp-p
1Vp-p
V
CH2
RF SWP
CN261 pin
RF SWP
CN261 pin
3
CH1
REC AFM
CN341
pin
REC AFM
CN341
pin
1
OK
NG
Should be minimized
RF signal dropout
6-4
2-4-2. SYNC AGC Check (MA-335 Board)
Mode
E-E
Signal
Color bar
Measurement point
IC201 pin #•
Measuring instrument
Oscilloscope
Specified value
A=2.10 ± 0.10Vp-p
[Check Method]
1)
1)
Check that the Video signal level (A) satisfies the specified
value.
value.
Fig. 6-2-6.
2-4-3. Recording Y Level Check (MA-335 Board)
Mode
E-E (SP)
Signal
No-signal
Measurement point
IC201 pin !•
Measuring instrument
Oscilloscope
Specified value
A=290 ± 70mVp-p
[Check Method]
1)
1)
Check that the recording RF signal satisfies the specified value.
Fig. 6-2-8.
2-4.
VIDEO SYSTEM CHECKS
For the video system checks, follow the checking procedures given
below as a rule. The color bar video signal supplied from the pattern
generator is used as the video input signal for the video system
adjustment of the recording mode. Check that the signal satisfies
the specified value designated in the “Check of input signal” (Fig.
6-2-2)
Unless otherwise specified, set the switches to the following
positions.
below as a rule. The color bar video signal supplied from the pattern
generator is used as the video input signal for the video system
adjustment of the recording mode. Check that the signal satisfies
the specified value designated in the “Check of input signal” (Fig.
6-2-2)
Unless otherwise specified, set the switches to the following
positions.
•
INPUT SELECT switch ........................................... LINE 1
•
TAPE SPEED
switch ..................... SP (Remote commander)
[Checking Sequence]
1)
1)
X’tal OSC Check
2)
SYNC AGC Check
3)
Recording Y Level Check
4)
Recording Chroma Level Check
5)
Playback Level Check
2-4-1. X’tal OSC Check (MA-335 Board)
Mode
Playback
Signal
Alignment tape: SP Color bar portion
Measurement point
IC201 pin %§
Measuring instrument
Oscilloscope and Frequency counter
Specified value
3,579,545 ± 70Hz
Note:
A frequency counter should be connected through a buffer
amplifier (oscilloscope, etc.) having a high impedance and
a low capacitance.
a low capacitance.
[Check Method]
1)
1)
Check that the oscillation frequency satisfies the specified value
and that the oscillation voltage is 500 ± 200mVp-p.
and that the oscillation voltage is 500 ± 200mVp-p.
Fig. 6-2-5.
500
±
200mVp-p
3,579,545
±
70Hz
White (100%)
H
A
A
6-5
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
• Perform the adjustment setting the switch on the following
positions.
•
INPUT SELECT switch ............................................ LINE 1
[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.
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
(S
MECHANISM)(9-921-647-11).
2-5-2. E-E Output Level Check
Mode
E-E
Signal
400Hz, –7.5dBs : CJ570
Measurement point
CJ570
Measuring instrument
Audio level meter
Specified value
–7.5 ± 2dBs
[Check Method]
1)
1)
Input signal of 400Hz and –7.5dBs to the CJ461 L/R.
2)
Check that the audio output level is –7.5 ± 3dBs.
2-4-4. Recording Chroma Level Check
(MA-335 Board)
Mode
Recording (SP)
Signal
Color bar
Measurement point
IC201 pin !¢
Measuring instrument
Oscilloscope
Specified value
A=450 ± 70mVp-p
[Check Method]
1)
1)
Confirm the amplitude of recording chroma level becomes the
specified value.
specified value.
Fig. 6-2-9.
2-4-5. Playback Level Check (MA-335 Board)
Mode
Playback
Signal Alignment
Alignment tape : SP mode color bar
portion
portion
Measurement point
Video LINE OUT terminal
Measuring instrument
Oscilloscope
Specified value
A=1.0 ± 0.1Vp-p (75
Ω
terminated)
[Check Method]
1)
1)
Check that the playback level satisfies the specified value.
Fig. 6-2-10.
A
White (100%)
H
A
VTR
Audio line OUTPUT L/R
Audio line INPUT L/R
Audio
oscillator
Attenuator
600
Ω
Audio level
meter
or
distortion
meter
47 k
Ω
6-6
2-5-3. Overall Output Level and Distortion Factor
Check
Mode
Self-record playback
Signal
400Hz, –7.5dBs : CJ570
Measurement point
CJ570
Measuring instrument
Audio level meter and Distortion
meter
meter
Specified value
Playback Level: –7.5 ± 3dBs
Distortion: 4.0% or less
Distortion: 4.0% or less
[Check Method]
1)
1)
Input signal of 400Hz and –7.5dBs to the audio input.
2)
Record signal.
3)
Playback the recorded portion.
4)
Check that the output level is –7.5 ± 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)
the Audio LINE IN terminal)
Measurement point
CJ570
Measuring instrument
Audio level meter
Specified value
– 45.5dBs or less
[Check Method]
1)
1)
Record.
2)
Playback recorded portion.
3)
Check that noise level is – 45.5dBs or less.
2-6.
TUNER SYSTEM ADJUSTMENT
2-6-1. Separation Adjustment (MA-335 Board)
Mode
E-E
Signal
RF signal
Video : Color bar
Video : Color bar
white (100%) modulation
Audio : L: 400Hz, R: 2kHz
30% modulation
Electrical field:
60-80dBm/75
Ω
terminated
Measuring instrument
Audio level meter
Measuring point
LINE OUT L
Adjusting element
RV731
Specified value
2kHz component minimum
[Adjustment Method]
1)
1)
Connect an audio level meter to LINE OUT L channel via HPF.
2)
Feed the RF signal from RF IN terminal.
3)
Adjust with RV731 so that the output level satisfies the specified
value.
value.
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