Electrical Adjustments; Beforem Aking Electrical Adjustments; Basic Adjustments - Panasonic CT-13R18B 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 for a heat sink,
•
apply the silicon grease (YG6260M) 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.)
The adjustments are needed for each mode, RF mode
•
and AV mode. Perform the adjustments refering each
adjustment items.
Prepare the following measurement tools for electrical
adjustments.
1. Oscilloscope
2. Digital Voltmeter
3. Pattern Generator
On-Screen Display Adjustment
1. In the condition of NO indication on the screen.
Press the VOL. DOWN button on the set and the Channel
button (9) on the remote control for more than 1 second to
appear the adjustment mode on the screen as shown in
Fig. 1-1.
00 OSD
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 ACTION button on the remote control to end
the adjustments.
NO. FUNCTION
00 OSD H
01 CUT OFF
04 H.VCO
05 H.PHASE
06 V.SIZE
07 V.SHIFT
08 R.DRIVE
09 B.DRIVE
10 R.BIAS
11 G.BIAS
12 B.BIAS
13 BRIGHT CENT

ELECTRICAL ADJUSTMENTS

TV
15
Fig. 1-1
NO. FUNCTION
14 BRIGHT MAX
15 BRIGHT MIN
16 CONTRAST CENT
17 CONTRAST MAX
18 CONTRAST MIN
19 COLOR CENT
20 COLOR MAX
21 COLOR MIN
22 TINT
23 SHARPNESS
28 TEST MONO
Fig. 1-2

2. BASIC ADJUSTMENTS

2-1: CUT OFF (RF)
1.
Adjust the unit to the following settings.
R.DRIVE=10, B.DRIVE=10, R.BIAS=64, G.BIAS=64,
B.BIAS=64, BRIGHTNESS=120, CONTRAST=40.
2.
Place the set with Aging Test for more than 15 minutes.
3. Activate the adjustment mode display of Fig. 1-1 and
press the channel button (01) on the remote control to
select "CUT OFF".
4. Adjust the Screen Volume until a dim raster is obtained.
2-2: WHITE BALANCE (RF)
NOTE: Adjust after performing CUT OFF adjustment.
1. Place the set with Aging Test for more than 10 minutes.
2. Receive the gray scale pattern from the Pattern Generator.
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 (10) on the remote control to
select "R. BIAS".
5. Press the CH. UP/DOWN button on the remote control to
select the "R. BIAS", "G. BIAS", "B. BIAS", "R. DRIVE" or
"B. DRIVE".
6. Adjust the VOL. UP/DOWN button on the remote control
to whiten the R. BIAS, G. BIAS, B. BIAS, R. DRIVE, and
B. DRIVE at each step tone sections equally.
7. Perform the above adjustments 5 and 6 until the white
color is looked like a white.
2-3: FOCUS (RF)
1. Receive a broadcast.
2. Turn the Focus Volume fully counterclockwise once.
3. Adjust the Focus Volume until picture is distinct.
2-4: HORIZONTAL PHASE (RF)
1. Receive the center cross signal from the Pattern
Generator.
2. Activate the adjustment mode display of Fig. 1-1 and
press the channel button (05) on the remote control to
select "H.PHAS".
3. Press the VOL. UP/DOWN button on the remote
control until the right and left screen size of the vertical
line becomes the same.
2-5: VERTICAL SIZE (RF)
1. Receive the cross hatch signal from the Pattern Genera-
tor.
2. Using the adjustment control, set the brightness and
contrast to normal position.
3. Activate the adjustment mode display of Fig. 1-1 and
press the channel button (06) on the remote control to
select "V.SIZE".
4. Press the VOL. UP/DOWN button on the remote control
until the rectangle on the center of the screen becomes
square.
5. Receive a broadcast and check if the picture is normal.
D-1