Sony SLV-E420CP / SLV-E420VC / SLV-E520CP / SLV-E520UX / SLV-E520VC Service Manual ▷ View online
6-4
2. ELECTRICAL ADJUSTMENT
VCR PRESETTING
This VCR need three basic presetting by using the menus displayed on-screen. After all connection have been made, then
follow steps 1 to 3 to preset the VCR.
The three presetting steps will be displayed in sequence on TV screen. The setting are entered with the remote control.
follow steps 1 to 3 to preset the VCR.
The three presetting steps will be displayed in sequence on TV screen. The setting are entered with the remote control.
Turn on the VCR
1. Adjusting the TV receiver to the video channel: The AUTO SET-UP screen will appear. When the video channel has
1. Adjusting the TV receiver to the video channel: The AUTO SET-UP screen will appear. When the video channel has
been preset, press the EXECUTE button on the remote control.
2. Country selection: Using the numeric button, select the country of use.
3. Language selection: When the desired language has been select, press the MENU button directly before prevent auto
3. Language selection: When the desired language has been select, press the MENU button directly before prevent auto
tuning will start.
When steps 1 to 3 have been finish, ready to operate the all operating mode.
2-1. SERVO CIRCUIT ADJUSTMENT
• These adjustments should be done upon completion of the tape transport adjustments.
• If the tape transport adjustments (except the tilt adjustment) are done after these adjustments, follow the procedures
• If the tape transport adjustments (except the tilt adjustment) are done after these adjustments, follow the procedures
again in section 2-1-3, “switching position adj.”
• When a cassette tape is loaded, auto-tracking will be set immediately after starting the first playback. To adjust servo
circuit, set back to the manual tracking condition, and set the tracking to the center position.
2-1-1 . TEST EQUIPMENT AND STANDARDS REQUIRED
Color Bar Signal Generator
PAL Color bar signal with 100% white level (EBU color bar signal)
Oscilloscope
Vertical sensitivity
: 5 mV/DIV, external trigger
Bandwidth
: more than 10 MHz
Alignment Tape
VHJ-0009 or VHJ-0023
: SP mode, monoscope. 6 KHz
Blank Tape
VHS-type cassette tape
Monitor TV
2-1-2. LOCATION OF ADJUSTMENT POINTS
CP-1 PWB (Foil side)
VR351
TP101
Fig. 2-1-1
6-5
VP-1 PWB Assembly
TP183
(SW-P)
(SW-P)
TP182
(ENV.)
(ENV.)
Fig. 2-1-2
Note:
• Self-recording means “Record any broadcasting or video
signal and play back the just-recorded portion.”
2-1-3. SWITCHING POSITION ADJ.
Measuring Point
Measuring Equipment
Adj. Condition
TPIO1
Oscilloscope
PLAY mode
(VIDEO OUT)
Alignment tape
TP183 (SW-P)
(VHJ-0009 or
VHJ-0023)
VHJ-0023)
Adj. Location
Adj. Value
VR351 (SW-P)
6.5 H
±
0.5 H
1. After ejecting the cassette tape, load the alignment
tape.
2. Within two seconds after the playback screen is
displayed. press the remote control tracking buttons (
4
)
once, and cheak that the ATR display goes off.
3. Press the remote control tracking button (
$
) once and
set the tracking to the center.
Note: Do not press the tracking buttons (
4
) and (
$
)
continuosly.
4. Adjust VR351 (SW-P) so that the width of “ T ” be-
comes 6.5 H
±
0.5 H as shown in Fig. 2-1-3.
T = 6.5H
±
0.5H
0.5H
1H
Rise
RF. SW. PULSE
Front edge of
vertical sync signal
vertical sync signal
Fig. 2-1-3
6-6
2-2. VIDEO CIRCUIT RELAY JIG
2-2-1 .TEST EQUIPMENT AND STANDARDS REQUIRED
Color Bar Signal Generator
PAL Color bar signel with 100% white level (EBU color bar signel)
Oscilloscope
Vertical sensitivity
: 5 mV/DIV, external trigger
Bandwidth
: more than 10 MHz
Oscilloscope Probe
Input capacity
: less than 25 pF (10:1)
less than 40 pF (1:1)
less than 40 pF (1:1)
Covering frequency
: DC ~ 40 MHz (10:1)
DC ~30 MHz (1:1)
DC ~30 MHz (1:1)
Digital Voltmeter
DC range
Alignment Tape
VHJ-0008 or VHJ-0023
: SP mode, color bar. 1 kHz
(Color bar signal waveform is described below. Refer to Fig. 2-2-1)
Relay Jig
VHJ-0065
: 5-wire flat cable for VP-1 PWB assembly (2 head model)
VHJ-0066
: 7-wire flat cable for VP-1 PWB assembly (4 head model)
RELAY JIG
Connect the flat cable end from the cylinder assembly to
the VP-1 PWB assembly using the relay jig to provide
simple repairing of the VP-1 PWB assembly, as shown in
Fig. 2-2-3. Further, when adjusting the VP-1 PWB assem-
bly, be sure to make contact an end of shield case with
bracket of the VP-1 PWB assembly to maintain the shield
effect. If the VP-1 PWB assembly does not contact, there
is insufficient ground and no proper play back image can
be obtained.
the VP-1 PWB assembly using the relay jig to provide
simple repairing of the VP-1 PWB assembly, as shown in
Fig. 2-2-3. Further, when adjusting the VP-1 PWB assem-
bly, be sure to make contact an end of shield case with
bracket of the VP-1 PWB assembly to maintain the shield
effect. If the VP-1 PWB assembly does not contact, there
is insufficient ground and no proper play back image can
be obtained.
ALIGNMENT TAPE COLOR BAR SIGNAL
Color bar signal waveform (VHJ-0008)
Color bar pattern (VHJ-0008) on monitor TV
Cy
an
Green
Ma
g
enta
Red
Blue
1Vp-p
0.7Vp-p
0.3Vp-p
V U
Black
0.3Vp-p
100% White
100%
White
White
Burst signal
H. Sync signal
75%
White
Y
ello
w
Cy
an
Green
Ma
g
enta
Red
Blue
(75%)
White
Y
ello
w
Fig. 2-2-1
Fig. 2-2-2
Relay Jig
VHJ-0065
or
VHJ-0066
VHJ-0065
or
VHJ-0066
Fig. 2-2-3
VP-1 PWB Assembly
Flat Cable
Cylinder
Assembly
Assembly
6-7
2-3. IF CIRCUIT ADJUSTMENT
• In this model, the circuits of the TUNER, IF, and RF
converter have been made into one. Therefore, should
one circuit malfunction, the whole unit must be replaced.
one circuit malfunction, the whole unit must be replaced.
• The adjustments for the IF (RF AGC) circuit of the 3 in 1
tuner are described below.
Note:
The 3 in tuner dose not need any adjustments,
because precise adjustments were down before
shipment.
because precise adjustments were down before
shipment.
2-3-1. TEST EQUIPMENT AND STANDARD REQUIRED
Monitor TV
2-3-2. LOCATION OF ADJUSTMENT POINT
3 in 1 Tuner
Rear Panel
3 in 1 Tuner
CP-1 PWB
Assembly
Assembly
Fig. 2-3-1
VR RF AGC
2-3-3. RF AGC ADJ.
1. Connect the monitor TV to the VHF/UHF antenna
output terminal.
2. Connect the VHF or UHF antenna to the VHF/UHF
antenna input terminal.
3. Receive the middle electrical field (70 dB
µ
~90 dB
µ
) of
the VHF or UHF channel, and slowly turn the VR (RF
AGC) from the point where snow-noise is present to the
point where it just disappears from the monitor TV.
AGC) from the point where snow-noise is present to the
point where it just disappears from the monitor TV.
4. Confirm by monitor TV that there is no beat and
saturation (S/N is best point) when receiving any TV
channel.
channel.
Measuring Point
Measuring Equipment
Adj. Condition
Picture of
Monitor TV
E-E mode
monitor TV
Adj. Location
Adj. Value
VR (RF AGC)
S/N is best point
(on the 3 in 1 tuner)
3. TEST POINTS FOR TAPE PATH ADJUSTMENT
Test points TP182 (ENV) and TP183 (SW-P) for tape path adjustment are shown in figure below.
VP-1 PWB Assembly
TP182
(ENV.)
(ENV.)
TP183
(SW-P)
(SW-P)
Fig. 3-1
E
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