Electrical Adjustments; Adjustment Procedure; Basic Adjustments - Toshiba 32DF46 Service Manual

1. ADJUSTMENT PROCEDURE

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. Multi-sound Generator
4. Pattern Generator
On-Screen Display Adjustment
1. In the condition of NO indication on the screen.
Press the UP/ 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.
00 OSD H
2. Use the Channel UP/DOWN button or Channel button
(0-9) on the remote control to select the options shown
in Fig. 1-2.
3. Press the MENU button on the remote control to end the
adjustments.
4. To display the adjustment screen for AV, CS and
DIGITAL mode, press the TV/VIDEO button on the
remote control to set to the AV, CS and DIGITAL mode.
Press the VOL.DOWN button on the set and the
channel (9) on the remote control for more than 2
seconds.

ELECTRICAL ADJUSTMENTS

TV-A
0
Fig. 1-1
NO. FUNCTION
00 OSD H
01 OSD C
02 CUT OFF
03 H.POSI
04 H BLK L
05 H BLK R
06 V. SIZE
07 V POSI
08 V.LIN
09 VS CORR
10 V COMP
11 R.BIAS
12 G.BIAS
13 B.BIAS
14 R.DRV
15 G.DRV
16 B.DRV
17 BRI.CENT
18 BRI.MAX
19 BRI.MIN

2. BASIC ADJUSTMENTS

2-1: CONSTANT VOLTAGE
1. Place the set in AV MODE without signal.
2. Connect the digital voltmeter to the TP003.
Adjust the VR502 until the digital voltmeter is 130 ± 0.5V.
3.
2-2: CUT OFF
1. Place the set in Aging Test for more than 15 minutes.
2. Place the set in AV MODE without signal.
3. Using the remote control, set the brightness and
contrast to normal position.
4. Activate the adjustment mode display of Fig. 1-1 and
press the channel button (02) on the remote control to
select "CUT OFF".
5. Adjust the Screen Volume until a dim raster is obtained.
2-3: FOCUS
1. Receive the monoscope pattern.
2. Turn the Focus Volume fully counterclockwise once.
3. Adjust the Focus Volume until picture is distinct.
2-4: WHITE BALANCE
NOTE: Adjust after performing CUT OFF adjustment.
1. Place the set in Aging Test for more than 15 minutes.
2. Receive the white 100% signal from the Pattern
Generator.
3. Using the adjustment control, set the brightness and
contrast to normal position.
4. Activate the adjustment mode display of Fig. 1-1 and
press the channel button (11) on the remote control to
select "R.BIAS".
5. Using the CH. UP/DOWN button on the remote control,
adjust the R.BIAS.
6. Press the CH. UP/DOWN button on the remote control to
select the "R.DRIVE", "B.DRIVE", "G.BIAS" or "B.BIAS".
7. Using the CH. UP/DOWN button on the remote control,
adjust the R.DRIVE, B.DRIVE, G.BIAS or B.BIAS.
8. Perform the above adjustments 6 and 7 until the white
color is achieved.
D-1
NO. FUNCTION
20
CONT.CENT
21 CONT.MAX
22
CONT.MIN
23
COL.CENT
24 COL.MAX
25
COL.MIN
26 TINT CENT
27
SHARP.CENT
28
SHARP.MAX
29 SHARP.MIN
30
SUB BIAS
31 H.SIZE
32
PARABOLA
33 TRAPEZIUM
34
COR TOP
35
COR BTM
36 TEST STEREO
37
TEST AUDIO
38 H FREQ
Fig. 1-2