Sony SLV-E160EE / SLV-E290EE / SLV-E290EG / SLV-E410AP / SLV-E410CP / SLV-E410EE / SLV-E410EX / SLV-E410IT / SLV-E410UX / SLV-E410VP Service Manual ▷ View online
7-1. MECHANICAL ADJUSTMENTS
7-2. ELECTRICAL ADJUSTMENTS
2-1.
PREPARATION BEFORE ADJUSTMENT
2-1-1.
Equipment Required
The measuring instruments used for this alignment include:
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.)
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 tape
MH-2
Part No. : H7099052H
2-1-2.
Equipment Connection
Unless otherwise specified, connect and adjust the measuring
instruments as shown in the following diagram.
Fig. 7-2-1.
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.
Unless otherwise specified, place the switches and controls of this
unit in the following positions:
• switch
……………………………LINE
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. 7-2-2.
Fig. 7-2-2. Color Bar Signals of Pattern Generator
2-1-4.
Alignment Tape
• Contents of MH-2 (H7099052H)
Mode
Period
Video signal
Audio signal
1
10 minutes
Stair step
7kHz
2
SP
5 minutes
—
3kHz
3
10 minutes
Color bar
1kHz
4
3 minutes
RF sweep
—
CHANNEL
SECTION 7
ADJUSTMENTS
7-1
SLV-E160EE/E290EE/E290EG/E410AP/E410CP
E410EE/E410EX/E410IT/E410UX/E410VP
For the mechanical adjustments, please refer to the
"VHS MECHANICAL ADJUSTMENT MANUAL
"VHS MECHANICAL ADJUSTMENT MANUAL
4
(H MECHANISM)" (9-973-623-11).
See the adjusting part location diagram from on page 7-6
for the adjustment.
for the adjustment.
Pattern generator
Video output
(75
Ω
)
VIDEO LINE IN
VCR
VIDEO LINE OUT
Monitor TV
Approx. 0.7 V
Red
Horizontal sync signal
Burst signal
(Should be flat.)
(Should be flat.)
Approx.
0.3 V
0.3 V
White (Approx. 75%)
Approx. 0.3 V
2-1-5.
Input/Output Levels and Impedance
Video input:
LINE IN
(phono jack) (1)
Input signal: 1Vp-p, 75ohms, unbalanced,
sync negative
Video output:
LINE OUT
(phono jack) (1)
Output signal: 1Vp-p, 75ohms, unbalanced,
sync negative
Audio input:
LINE IN
(phono jack) (1)
Input level: -7.5 dBs
(0dBs=0.775Vrms)
Input impedance: more than 47 kilohms
Audio output:
LINE OUT
(phono jack) (1)
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-249 Board)
Mode E-E
Measuring Instrument
Digital voltmeter
SW 12V Check
Measurement point
IC141 pin w
Specified value
12.0 ± 0.3V
MTR12V Check
Measurement point
D131 cathode
Specified value
12.4 ± 0.5V
SW5V Check
Measurement point
Q161 emitter
Specified value
5.1 ± 0.2Vdc
D5V Check
Measurement point
D505 cathode
Specified value
5.1 ± 0.2V
[Check Method]
1) Each of these supply voltages must meet its specified value.
7-2
Power Supply Check
Servo System Adjustments
Video System adjustments
Audio System adjustments
2-3.
SERVO SYSTEM CHECK
Unless otherwise specified, set the switches to the following
positions.
•
Switch ………………………………LINE
•
Switch …………………………………SP
2-3-1.
RF Switching Position Check
(MA-249, RP-196 Boards)
[Adjustment Purpose]
To check 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 terminal
CH2: CN002 pin e (RF SWP)
(RP-196 board)
Measuring instrument
Oscilloscope
Specified value
6.5 ± 0.5H (416 ± 32 µSEC)
[Check Method]
1) Set
switch to MANUAL. (“Auto tracking”
display will disappear on the display window indicator.)
2) Press the tracking buttons
and
and adjust the tracking
position to the center.
3) Confirm the specified value 416 ± 32µSEC (6.5±0.5H)
Fig. 7-2-3.
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. 7-2-2)
Unless otherwise specified, set the switches to the following
positions.
•
Switch ………………………………LINE
•
Switch …………………………………SP
[Checking Sequence]
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-249 Board)
Mode Playback
Signal
Alignment tape: SP Color bar
portion
Measurement point
IC201 pin @3
Measuring instrument
Oscilloscope and Frequency
counter
Specified value
4,433,619 ± 90Hz
Note:
A frequency counter should be connected through
a buffer amplifier (oscilloscope, etc.) having a high
impedance and a low capacitance.
[Check Method]
1) Check that the oscillation frequency satisfies the specified
value and that the oscillation voltage is 450 ± 200mVp-p.
Fig. 7-2-4.
TAPE SPEED
CHANNEL
▲
▼
TRACKING
TAPE SPEED
CHANNEL
7-3
CH1
CH2
(CN002 PIN
e
(RF SWP))
6.5
±
0.5H
(416
±
32
µ
sec)
Vertical sync. signal
enlarrgement
V
CH1
CH2
Approx.
1Vp-p
1Vp-p
Approx.
5Vp-p
5Vp-p
Normal tracking
Moves to the right when the
▲
button is pressed
and to the left when the
▼
button is pressed.
450
±
200mVp-p
4,433,619
±
90Hz
2-4-2.
SYNC AGC Check (MA-249 Board)
Mode E-E
Signal Color
bar
Measurement point
Video LINE OUT terminal
Measuring instrument
Oscilloscope
Specified value
A=1.00 ± 0.05Vp-p
[Check Method]
1) Check that the SYNC AGC level (A) satisfies the specified
value.
Fig. 7-2-5.
2-4-3.
White Clip/Dark Clip Check (MA-249 Board)
Mode E-E
Signal Color
bar
Measurement point
IC201 pin #2
Measuring instrument
Oscilloscope
Specified value
White clip: 190 ± 15%
Dark clip: 52 ± 10%
[Check Method]
1) Check that the white clip level is 190 ± 15% to the white
(100%) level.
2) Check that the dark chip level is 52 ± 10% to the white (100%)
level.
Fig. 7-2-6.
2-4-4.
Recording Y Level Check (MA-249 Board)
Mode E-E
Signal No-signal
Measurement point
Q214 Emitter
Measuring instrument
Oscilloscope
Specified value
A=550 ± 150mVp-p
[Check Method]
1) Check that the recording RF signal satisfies the specified
value.
Fig. 7-2-7.
2-4-5.
Recording Chroma Level Check
(MA-249 Board)
Mode Recording
Signal Color
bar
Measurement point
IC201 pin #0
Measuring instrument
Oscilloscope
Specified value
A=160±28mV
[Check Method]
1) Confirm the amplitude of recording chroma level becomes the
specified value.
Fig. 7-2-8.
7-4
A
H
White (75%)
100%
H
A
B
A
A
Click on the first or last page to see other SLV-E160EE / SLV-E290EE / SLV-E290EG / SLV-E410AP / SLV-E410CP / SLV-E410EE / SLV-E410EX / SLV-E410IT / SLV-E410UX / SLV-E410VP service manuals if exist.