Sony SLV-999HF / SLV-M11HF / SLV-M91HF Service Manual ▷ View online
6-1
SLV-999HF/M11HF/M91HF
SECTION 6
ADJUSTMENTS
6-1. MECHANICAL ADJUSTMENT
For the mechanical adjustments, please refer to the
“VHS MECHANICAL ADJUSTMENT MANUAL
S MECHANISM ” (9-921-647-11).
“VHS MECHANICAL ADJUSTMENT MANUAL
S MECHANISM ” (9-921-647-11).
6-2. ELECTRICAL ADJUSTMENT
See the adjusting part location diagram from on page 6-8 for the
adjustment.
adjustment.
2-1.
PREPARATION BEFORE ADJUSTMENT
2-1-1.
Equipment Required
The measuring instruments used for this alignment include:
1)
1)
Monitor TV
2)
Oscilloscope, dual-trace, bandwidth above 30 MHz with delay
mode (Unless specified otherwise, use a 10 : 1 probe.)
mode (Unless specified otherwise, use a 10 : 1 probe.)
3)
Frequency counter
4)
NTSC pattern generator
5)
Remote commander
5)
Digital voltmeter
6)
Audio generator
7)
Audio level meter
8)
Audio distortion meter
9)
Audio attenuator
10) Alignment tape
KRV-51N2 (NTSC) Part No.: 8-192-605-32
11) Camcoder with LASER LINK function
2-1-2.
Equipment Connection
Unless specified otherwise, connect the measuring instrument as
shown in the following diagram.
shown in the following diagram.
Fig. 6-2-1
LINE-1 IN VIDEO
LINE OUT
Video output
(75
Ω
)
Pattern generator
VCR
Monitor TV
2-1-3.
Setup for adjustment
Because the video signal obtained from the pattern generator is used
as the adjustment signal for adjustments, the video output signal
must satisfy the given specification.
Connect the oscilloscope to VIDEO LINE-1 IN terminal, and check
that the amplitude of sync signal is approximately 0.286 V, the
amplitude of the video section is approximately 0.714 V and the
amplitude of burst signal is approximately 0.286 V.
The video signal used for adjustments is shown in Fig. 6-2-2.
as the adjustment signal for adjustments, the video output signal
must satisfy the given specification.
Connect the oscilloscope to VIDEO LINE-1 IN terminal, and check
that the amplitude of sync signal is approximately 0.286 V, the
amplitude of the video section is approximately 0.714 V and the
amplitude of burst signal is approximately 0.286 V.
The video signal used for adjustments is shown in Fig. 6-2-2.
Fig. 6-2-2. Color Bar Signal of Pattern Generator
2-1-4.
Alignment Tape
• Contents of KRV-51
1 V
0.714 V
0.286 V
White (75%)
White (100%)
Y
ello
w
Cy
an
Green
Magenta
Red
Blue
Burst signal
0.286 V
Q
I
Horizontal sync signal
1
2
3
4
Mode
SP
LP
Period
7 minuted
3 minuted
7 minuted
3 minuted
Video Signal
Color bar
Monoscope
Color bar
Monoscope
Audio Signal
Hi-Fi
Normal
400 Hz
400 Hz
(L/R)
6-2
2-1-5.
Input/Output Levels and impedance
Video input:
LINE-1 IN/ LINE-2 IN
Input signal: 1 Vp-p, 75 ohms, unbalanced,
sync negative
Input signal: 1 Vp-p, 75 ohms, unbalanced,
sync negative
Video output: LINE OUT
Output signal: 1 Vp-p, 75 ohms, unbalanced,
sync negative
sync negative
Audio input:
LINE-1 IN/ LINE-2 IN
Input level: –7.5 dBs (0 dBs = 0.775 Vrms)
Input impedance: more than 47 kilohms
Input level: –7.5 dBs (0 dBs = 0.775 Vrms)
Input impedance: more than 47 kilohms
Audio output: LINE OUT
Output level: –7.5 dBs at load impedance 47 kilohms
Output impedance: less than 10 kilohms
Output impedance: less than 10 kilohms
2-1-6.
Adjustment Sequence
The adjustments should be performed in the following sequence.
Power Supply Check
↓
Servo System Adjustments
↓
Video system Check
↓
Audio System Adjustments
↓
Laser Link System Adjustments
2-2.
POWER SUPPLY CHECK
2-2-1.
Power Supply Voltage Check (MA-360 board)
Mode
E-E
Measuring instrument
Digital voltmeter
35 V check
Measurement point
CN603 pin
!¡
Specified value
37 ± 1 Vdc
13 V check
Measurement point
CN603 pin
9 or !º
Specified value
13.2 ± 0.5 Vdc
6 V check
Measurement point
CN603 pin
4 or 5
Specified value
5.9 ± 0.15 Vdc
+F, –F check
Measurement point
+ probe: CN603 pin
1
– probe: CN603 pin
2
Specified value
4.5 ± 0.5 Vdc
[Check Method]
1)
1)
Check that each power supply voltage satisfies the specified
value.
value.
6-3
2-3.
SERVO SYSTEM ADJUSTMENT
2-3-1.
RF Switching Position Adjustment
(MA-360 Board)
(MA-360 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 mode color bar portion
SP mode color bar portion
Measurement Point
CH1: VIDEO LINE OUT terminal
CH2: CN270 pin
CH2: CN270 pin
3 (RF SWP)
Measuring Instrument
Oscilloscope
Specified Value
t = 413 ± 32
µ
sec (6.5 ± 0.5 H)
[Adjustment method]
1)
1)
Connect JS161 (IC161 pin
%§ ) (SW POS ADJ) and GND with
a jumper wire.
2)
Check that “AP” indicator on the display window turns on.
3)
Remove the jumper wire.
3)
Press CHANNEL+ and CHANNEL– buttons and adjust the
switching position (t) to the specified value.
switching position (t) to the specified value.
4)
Press PAUSE button to write the data in EEPROM.
5)
Check that the display changes to “AH” and mode goes to the
Hi-Fi switching position adjustment.
Hi-Fi switching position adjustment.
6)
Perform “Hi-Fi Switching Position Adjustment”.
Fig. 6-2-3
2 V
CH1
CH2
Magnified
V sync
CH1
CH2
t
2-3-2.
Hi-Fi Switching Position Adjustment
(MA-360 Board)
(MA-360 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 switching noise will be heard, 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 switching noise will be heard, etc.
Mode
Playback
Signal
Alignment tape:
SP mode color bar portion
SP mode color bar portion
Measurement Point
CH1: CN270 pin
1 (HF ADJ)
CH2: CN270 pin
3 (RF SWP)
Measuring Instrument
Oscilloscope
Specified Value
A = minimum
Note:
Perform “RF Switching Position Adjustment” before this adjustment.
[Adjustment method]
1)
1)
Check that “AH” indicator on the display window turns on.
2)
Press CHANNEL+ and CHANNEL– buttons and minimize
the part A of PB AF RF signal.
the part A of PB AF RF signal.
3)
Press PAUSE button to write the data in EEPROM.
4)
Check that the “AH” indicator turns off.
Fig. 6-2-4
A
A
2 V
CH1
CH2
6-4
2-4.
VIDEO SYSTEM CHECK
2-4-1.
Playback Level Check (MA-360 board)
[Adjustment purpose]
Confirm that the playback video signal level is within the
specification.
Confirm that the playback video signal level is within the
specification.
Mode
Playback
Signal
Alignment tape: SP mode color bar
portion
portion
Measurement Point
CN261
!º pin (VIDEO IN)
(CN501
!º pin of VD-29 board)
Measuring Instrument
Oscilloscope
Specified Value
A = 2.10 ± 0.14 V
[Check method]
1)
1)
Check that the video signal level (A) satisfies the specified
value.
value.
Fig. 6-2-5
2-4-2.
Sync AGC Check (MA-360 board)
[Adjustment purpose]
Confirm that the E-E video output level is within the specification.
Confirm that the E-E video output level is within the specification.
Mode
E-E
Signal
Color bar
Measurement Point
CN261
!º pin (VIDEO IN)
(CN501
!º pin of VD-29 board)
Measuring Instrument
Oscilloscope
Specified Value
A = 2.10 ± 0.14 V
Switch setting:
INPUT SELECT ........................................................................ L1
[Check method]
1)
INPUT SELECT ........................................................................ L1
[Check method]
1)
Input a color bar signal to VIDEO LINE-1 terminal.
2)
Check that the video signal level (A) satisfies the specified
value.
value.
Fig. 6-2-6
White (100%)
A
H
2-4-3.
Deviation Check
[Adjustment purpose]
Confirm that the YFM signal deviation is within the specification.
Confirm that the YFM signal deviation is within the specification.
Mode
Recording and playback (SP mode)
Signal
Color bar
Measurement Point
CN261
!º pin (VIDEO IN)
(CN501
!º pin of VD-29 board)
Measuring Instrument
Oscilloscope
Specified Value
A = 2.10 ± 0.14 V
Note:
This check should be carried out upon completion of “Playback
Level Check” and “Sync AGC Check”.
Level Check” and “Sync AGC Check”.
Switch setting:
INPUT SELECT ........................................................................ L1
INPUT SELECT ........................................................................ L1
[Check method]
1)
1)
Record the color bar signal.
2)
Playback the recorded section.
3)
Check that the video signal level (A) satisfies the specified
value.
value.
Fig. 6-2-7
White (100%)
A
H
White (100%)
A
H
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