Toshiba VTW2887, Руководство по обслуживанию

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ELECTRICAL ADJUSTMENTS
D3-1
1. ADJUSTMENT PROCEDURE
Read and perform these adjustments when repairing the
circuits or replacing electrical parts or PCB assemblies.
CAUTION
On-Screen Display Adjustment
1.
2.
Unplug the AC plug for more than 30 minutes to set the
clock to the non-setting state. (To release the Back-Up
immediately, take the short circuit between C1003 and
GND at the Power Off.) Then, set the volume level to
minimum.
Press the VOL. DOWN button on the set and the
channel button (9) on the remote control for more than
2 seconds to display adjustment mode on the screen as
shown in Fig. 1-1.
Fig. 1-1
01 RF AGC 40
TV
3.
4.
Use the Channel UP/DOWN button or Channel button
(0-9) on the remote control to select the options shown
in Fig. 1-2.
Press the MENU button on the remote control to end
the adjustments.
FUNCTION
CUT OFF
RF AGC
AGC GAIN
R DRIVE
R CUTOFF
G DRIVE
G CUTOFF
B DRIVE
H POSI
V POSI
---
V SIZE
---
VCO COARSE
VCO FINE
VCO COARSE L1
VCO FINE L1
BRIGHT CENT
BRIGHT MAX
BRIGHT MIN
CONTRAST CENT
CONTRAST MAX
CONTRAST MIN
COLOR CENT
COLOR MAX
COLOR MIN
---
SHARP
M R CUT OFF NO.
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
•
•
•
•
Use an isolation transformer when performing any
service on this chassis.
Before removing the anode cap, discharge electricity
because it contains high voltage.
When removing a PCB or related component, after
unfastening or changing a wire, be sure to put the wire
back in its original position.
When you exchange IC and Transistor with a heat sink,
apply silicon grease on the contact section of the heat
sink. Before applying new silicon grease, remove all the
old silicon grease. (Old grease may cause damages to
the IC and Transistor.)
NO.
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57 FUNCTION
M G CUT OFF
M B CUT OFF
H POS OSD
---
---
---
CVBS OUT
APR THRESHOLD
BELL FILTER
BANDPASS
REC AGC
VS 4:3
HS 4:3
PC 4:3
CC 4:3
S CORR
E/W SHAPE
TRAPEZIUM
VS FULL
HS FULL
PC FULL
CC FULL
V POSI
---
---
VS CINEMA
HS CINEMA
PC CINEMA
CC CINEMA
Fig. 1-2
2. BASIC ADJUSTMENTS
(VCR SECTION)
2-1: PG SHIFTER
1.
2.
3.
Playback the alignment tape.
Press and hold the Tracking-Auto button on the remote
control more than 2 seconds to set tracking to center.
Press the VOL. DOWN button on the set and the
channel button (3) on the remote control simultaneously
until the indicator REC disappears. If the indicator REC
disappears, adjustment is completed.
(If the above adjustments doesn't work well:)
4.
5.
6.
7.
Connect CH-1 on the oscilloscope to TP4502 and CH-2
to TP4501.
Press the VOL. DOWN button on the set and the
channel button (3) on the remote control simultaneously
until the indicator REC disappears.
When the REC indicator is blinking, press both VOL.
DOWN button on the set and the channel button (4) on
the remote control simultaneously and adjust the
Tr/- button until the arising to the down of Head
Switching Pulse becomes 6.5
±
0.5H.
(Refer to Fig. 2-1-A, B)
Stop the alignment tape.
CH-1
CH-2
6.5H
Fig. 2-1-A
CH-2
CH-1
6.5H
Fig. 2-1-B
2-2: VCO
1.
2.
3.
4.
5.
6.
Place the set in Aging Test for more than 10 minutes.
Connect the oscillator (39.5MHz) to TP601.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (13) on the remote control to
select "VCO COARSE".
Press the LEFT/RIGHT button on the remote control
until the "OK" appear on the screen. If the "OK" is not
displayed, select the "-" side on the changed from "+" to
"-".
Press the channel button (14) to set to "VCO FINE"
mode.
Press the LEFT/RIGHT button on the remote control to
select the 5 step down point from the upper limit on the
"OK".
(Example: In case of the "OK" point 41, select 36.)
(MONITOR TUNER)
NO.
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72 FUNCTION
ZM CINEMA
S CORR CINEMA
---
VS 16:9
HS 16:9
PC 16:9
CC 16:9
ZM 16:9
---
---
VS 14:9
HS 14:9
PC 14:9
CC 14:9
ZM 14:9