Sony SLV-E830B / SLV-E830NP / SLV-E830VC1 / SLV-E830VC2 Service Manual ▷ View online
6-1
SECTION 6
ADJUSTMENTS
SLV-E830B/E830NP/E830VC1/E830VC2
6-1. MECHANICAL ADJUSTMENTS
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 ADJUSTMENTS
See the adjustment parts location diagram on page 6-6
for the adjustment.
for the 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 of 30MHz or more, with
delay mode (A probe 10:1 should be used unless otherwise
specified.)
delay mode (A probe 10:1 should be used unless otherwise
specified.)
3)
Frequency counter
4)
Pattern generator
5)
Digital voltmeter
6)
Audio generator
7)
Audio level meter
8)
Audio distortion meter
9)
Audio attenuator
10) Alignment tapes
KRV-51P
Part No. : 8-192-605-36
2-1-2.
Equipment Connection
Unless otherwise specified, connect and adjust the measuring
instruments as shown in the following diagram.
instruments as shown in the following diagram.
Fig. 6-2-1
2-1-3.
Input Signal Check
Video signal produced by a pattern generator is used as an adjustment
signal to perform electrical alignment for this unit. This video signal
must satisfy the specification.
signal to perform electrical alignment for this unit. This video signal
must satisfy the specification.
Unless otherwise specified, place the switches and controls of this
unit in the following positions:
• INPUT SELECT switch ................................................. LINE 1
unit in the following positions:
• INPUT SELECT switch ................................................. LINE 1
Connect an oscilloscope to the Video Input terminal. Check that the
synchronizing signal of the Y signal has an amplitude of
approximately 0.7V and that the burst signal has an amplitude of
approximately 0.3V and its waveform is flat. And check that the
level ratio of burst signal to “red” signal is 0.30 : 0.66. The video
signal (color bar) used for electrical aligning this unit is shown in
Fig. 6-2-2.
synchronizing signal of the Y signal has an amplitude of
approximately 0.7V and that the burst signal has an amplitude of
approximately 0.3V and its waveform is flat. And check that the
level ratio of burst signal to “red” signal is 0.30 : 0.66. The video
signal (color bar) used for electrical aligning this unit is shown in
Fig. 6-2-2.
Fig. 6-2-2 Color Bar Signals of Pattern Generator
2-1-4.
Alignment Tape
• Contents of KRV-51P
1
2
3
4
Mode
SP
LP
Period
7 minutes
3 minutes
7 minutes
3 minutes
Video signal
Color bar
Monoscope
Color bar
Monoscope
Audio signal
Hi-Fi
400Hz
(L/R)
Normal
400Hz
EURO : CN540
VIDEO LINE IN
VIDEO LINE IN
EURO : CN540
VIDEO LINE OUT
VIDEO LINE OUT
Video output
(75
Ω
)
Pattern generator
VCR
Monitor TV
Red
White (Approx. 75%)
Approx. 0.7 V
Approx. 0.3 V
Horizontal sync signal
Approx.
0.3 V
0.3 V
Burst signal
(Should be flat)
(Should be flat)
6-2
2-1-5.
Input/Output Levels and Impedance
Video input:
LINE IN
EURO
Input signal: 1Vp-p, 75ohms, unbalanced,
sync negative
EURO
Input signal: 1Vp-p, 75ohms, unbalanced,
sync negative
Video output: LINE OUT
EURO
Output signal: 1Vp-p, 75ohms, unbalanced,
sync negative
Output signal: 1Vp-p, 75ohms, unbalanced,
sync negative
Audio input:
LINE IN
EURO
Input level: –7.5 dBs
(0dBs= 0.775Vrms)
Input impedance: more than 47 kilohms
EURO
Input level: –7.5 dBs
(0dBs= 0.775Vrms)
Input impedance: more than 47 kilohms
Audio output: LINE OUT
EURO
Standard level: –7.5dBs at load impedance 47
kilohms
Output impedance: less than 10 kilohms
Standard level: –7.5dBs at load impedance 47
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-316 Board)
Mode
E-E
Measuring Instrument
Digital voltmeter
TUNER 30V Check
Measurement point
D702 Cathode
Specified value
33 ± 2V
VCC 12V Check
Measurement point
IC530 Pin 2
Specified value
12.0 ± 0.3V
D 5V Check
Measurement point
D160 Cathode
Specified value
5.2 ± 0.3V
[Check Method]
1)
1)
Each of these supply voltages must meet its specified value.
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
• TAPE SPEED switch ............................................................ SP
2-3-1.
RF Switching Position/
AF Switching Position Adjustments
(MA-316, RP-231 Boards)
AF Switching Position Adjustments
(MA-316, RP-231 Boards)
[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)
(RP-231 board)
CN341 pin 1 (HF ADJ)
(AF switching position)
(RP-231 board)
CH2: CN261 pin 3 (RF SWP)
(RP-231 board)
Measuring instrument
Oscilloscope
Specified value
6.5 ± 0.5H (416 ± 32
µ
sec)
Power Supply Check
Servo System Adjustments
Video System Adjustments
Audio System Adjustments
6-3
[Adjustment Method]
1)
1)
Short-circuit between pin 5 (AV ADJ) and 3 (GND) of CN261
for about 1 second to activate the RF switching position
adjustment mode.
for about 1 second to activate the RF switching position
adjustment mode.
2)
Check that “AF” is indicated on FL display.
3)
Using the program + and – buttons, adjust to 416 ± 32
µ
sec
(6.5 ± 0.5H).
4)
Press the PAUSE button.
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 program + 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)
Press the EJECT button.
Fig. 6-2-4
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
• TAPE SPEED switch ............................................................ SP
[Checking Sequence]
1)
1)
X’tal OSC Check
2)
SYNC AGC Check
3)
White clip/Dark clip Check
4)
Recording Y Level Check
5)
Recording Chroma Level Check
6)
Playback Level Check
2-4-1.
X’tal OSC Check (MA-316 Board)
Mode
Playback
Signal
Alignment tape: SP Color bar portion
Measurement point
Q211 Emitter
Measuring instrument
Oscilloscope and Frequency counter
Specified value
4,433,619 ± 96Hz
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
(CN261 PIN
2
(RF SWP))
(RP-231)
(RP-231)
6.5
±
0.5H
(416
±
32
µ
sec)
Approx.
1Vp-p
1Vp-p
Approx.
5Vp-p
5Vp-p
V
CH1
CH2
Enlargement
Vertical sync. signal
CH1
CH2
CH2
RF SWP
(CN261 PIN
RF SWP
(CN261 PIN
2
)
(RP-231)
CH1
HF ADJ
(CN341
PIN
HF ADJ
(CN341
PIN
1
)
(RP-231)
OK
NG
Should be minimized
RF signal dropout
500
±
200mVp-p
4,443,619
±
96Hz
6-4
2-4-2.
SYNC AGC Check (MA-316 Board)
Mode
E-E
Signal
Color bar
Measurement point
IC201 pin #•
Measuring instrument
Oscilloscope
Specified value
A=2.1 ± 0.1Vp-p
[Check Method]
1)
1)
Check that the Video signal level (A) satisfies the specified
value.
value.
Fig. 6-2-6
2-4-3.
White Clip/Dark Clip Check (MA-316 Board)
Mode
E-E
Signal
Color bar
Measurement point
IC201 pin #¶
Measuring instrument
Oscilloscope
Specified value
White clip : 190 ± 15%
Dark clip : 58.5 ± 5%
Dark clip : 58.5 ± 5%
Connect a resistor of 3.3k
Ω
between IC201 pin $™ and GND.
[Check Method]
1)
1)
Check that the white clip level is 190 ± 15% to the white (100%)
level.
level.
2)
Check that the dark chip level is 58.5 ± 5% to the white (100%)
level.
level.
Fig. 6-2-7
2-4-4.
Recording Y Level Check (MA-316 Board)
Mode
E-E
Signal
No-signal
Measurement point
IC201 pin !•
Measuring instrument
Oscilloscope
Specified value
A=307 ± 50mVp-p
[Check Method]
1)
1)
Check that the recording RF signal satisfies the specified value.
Fig. 6-2-8
2-4-5.
Recording Chroma Level Check
(MA-316 Board)
(MA-316 Board)
Mode
Recording
Signal
Color bar
Measurement point
IC201 pin !¢
Measuring instrument
Oscilloscope
Specified value
A=350 ± 40mV
[Check Method]
1)
1)
Confirm the amplitude of recording chroma level becomes the
specified value.
specified value.
Fig. 6-2-9
A
H
A
B
White (100%)
100%
H
A
A
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