Electrical Adjustments - Toshiba MD13Q42 Service Manual

1. BEFORE MAKING ELECTRICAL
ADJUSTMENTS
Read and perform these adjustments when repairing the
circuits or replacing electrical parts or PCB assemblies.
CAUTION
• 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).
Prepare the following measurement tools for

electrical adjustments.

1. Oscilloscope
2. Digital Voltmeter
3. AC Voltmeter
4. Pattern Generator
5. Multi-Sound Signal Generator
On-Screen Display Adjustment
1. Set the VOLUME to minimum.
2. Press the VOL. DOWN button on the set and the
Channel button (9) on the remote control for more than
2 seconds to appear the adjustment mode on the screen
as shown in Fig. 1-1.
Function
01 OSD
Step No.
3. Use the Channel UP/DOWN button or Channel button
(1-0) on the remote control to select the options shown
in Fig. 1-2.
4. Press the MENU button on the remote control to end the
adjustments.
ELECTRICAL ADJUSTMENTS
17
Fig. 1-1
NO. FUNCTION
01 OSD H
02 CUT OFF
03 H VCO
04 H PHASE
05 V SIZE
06 V POSITION
07 R DRIVE
08 B DRIVE
09 R CUT OFF
10 G CUT OFF
11 B CUT OFF
12 BRIGHTNESS(CENT.)
13 BRIGHTNESS(MAX)
14 BRIGHTNESS(MIN)
15 CONTRAST(CENT.)
16 CONTRAST(MAX)
17 CONTRAST(MIN)
18 COLOR(CENT.)
19 COLOR(MAX)
20 COLOR(MIN)
21 TINT
22 SHARPNESS
23 BRI. AV(CENT.)
24 BRI. AV(MAX)
25 BRI. AV(MIN)
26 CONT. AV(CENT.)
27 CONT. AV(MAX)
2. BASIC ADJUSTMENTS
2-1: CONSTANT VOLTAGE
1. Place the set in AV MODE without signal.
2. Using the remote control, set the brightness and contrast
to normal position.
3. Connect the digital voltmeter to TP401.
4. Adjust the VR3800 until the digital voltmeter is 132
2-2: FOCUS
1. Receive the monoscope pattern.
2. Turn the Focus Volume fully counterclockwise once.
3. Adjust the Focus Volume until picture is distinct.
2-3: CUT OFF
1. Adjust the unit to the following settings.
R CUT OFF=7F, G CUT OFF=7F, B CUT OFF=7F,
R DRIVE=3F, B DRIVE=3F
2. Set condition is Aging Test for more than 15 minutes.
3. Set condition is AV MODE without signal.
4. Using the remote control, set the brightness and
contrast to normal position.
5. Activate the adjustment mode display of Fig. 1-1 and
press the channel button (02) on the remote control to
select "CUT OFF".
6. Adjust the Screen Volume until a dim raster is obtained.
D-1
NO FUNCTION
.
28 CONT. AV(MIN)
29 COL. AV(CENT.)
30 COL. AV(MAX)
31 COL. AV(MIN)
32 TINT AV
33 SHARPNESS AV
34 BRI. DVD(CENT.)
35 BRI. DVD(MAX)
36 BRI. DVD(MIN)
37 CONT. DVD(CENT.)
38 CONT. DVD(MAX)
39 CONT. DVD(MIN)
40 COL. DVD(CENT.)
41 COL. DVD(MAX)
42 COL. DVD(MIN)
43 TINT DVD
44 SHARPNESS DVD
45 BRI. GAME(CENT)
46 BRI. GAME(MAX)
47 BRI. GAME(MIN)
48 CONT. GAME(CENT)
49 CONT. GAME(MAX)
50 CONT. GAME(MIN)
51 TUNING V MUTE
52 POWER ON V MUTE
53 INPUT LEVEL
54 SEPARATION L
Fig. 1-2
55 SEPARATION H
0.5V.