Panasonic PT-LW373 / PT-LW333 / PT-LB423 / PT-LB383 / PT-LB353 / PT-LB303 (serv.man3) Service Manual ▷ View online
ADJ-3
SECTION 3 ADJUSTMENTS
<LW373/LW333/LB423/LB383/LB353/LB303>
2. Optical Adjustment
Before taking optical adjustments, remove the cabinet top following the "Mechanical Disassembly".
Tools: a hex wrench and a slot screwdriver.
Note: Do not disconnect connectors on the main board, because the projector cannot turn on due to operate the
power failure protection.
Tools: a hex wrench and a slot screwdriver.
Note: Do not disconnect connectors on the main board, because the projector cannot turn on due to operate the
power failure protection.
2. 1. Optical center adjustment
[Before]
-
-
Input a 100% white signal.
1. Adjust the condenser lens (OUT) to obtain a completely white screen.
1) In case the shadow appears on the left or right edge of the
screen. Loosen 1 screw A and move the condenser lens unit
right or left to disappear the shadow on the screen. (Fig2-1)
2) In case the shadow appears on the top or bottom edge of the
screen. Loosen 2 screws B and move the condenser lens unit
upper or lower to disappear the shadow on the screen. (Fig.2-2)
2. Tighten screws A and B to fix the condenser lens unit.
Fig. 2-2
Completely
white screen
Completely
white screen
Fig. 2-1
a
b
y
x
x
B
B
y
a
A
b
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SECTION 3 ADJUSTMENTS
<LW373/LW333/LB423/LB383/LB353/LB303>
3. Electrical adjustment
3. 1. Service adjustment menu operation
Enter service mode.
To enter the "Service Mode", press and hold the MENU button and button on the projector for more than 3 seconds or press
and hold the MENU button on the remote control for more than 20 seconds.
The service menu appears on the screen as follows.
To adjust service data
1. Select the adjusting items "Group", "No." or "Data" by pressing the MENU button repeatedly. The red cursor will
move to show the selected item.
2. To change the value of selected item, press the or button repeatedly. Refer to the "Service adjustment
data table" for further information.
move to show the selected item.
2. To change the value of selected item, press the or button repeatedly. Refer to the "Service adjustment
data table" for further information.
Exit service mode.
Press
to exit the service mode.
Service Mode PANASONIC
Input
Input
Computer 1
Image Dynamic
Group
Group
No.
Data
200
1
0
Ver.
1.00 XXXXX
Group No.
F/W version
Item No.
Data value
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SECTION 3 ADJUSTMENTS
<LW373/LW333/LB423/LB383/LB353/LB303>
* Before setting, check which type of Optical block is used by
the projector according to the "Optical block removal"
chapter in Optical Parts Disassembly.
1. Enter the service mode.
2. Optical block type check
Select Group 290 and No. 0 to check the following values;
2. Optical block type check
Select Group 290 and No. 0 to check the following values;
Data "0"
: L-type Optical block
Data "20"
: R-type Optical block
If the installed type of Optical block is different from the
set display mode, perform the following procedures.
3. Optical block type mode setting
set display mode, perform the following procedures.
3. Optical block type mode setting
Select Group 290 and No. 1, set the Data value between
10 and 0 or 20 according to the Optical block type. When
the value reaches 0 or 20, it will return to 10.
3. 2. Circuit adjustment
CAUTION: The each circuit has been made by the fine adjustment at factory. Do not attempt to adjust the following
adjustments except requiring the readjustments in servicing otherwise it may cause loss of performance
and product safety. Before adjustment, please turn on the projector for more than ten minutes.
WARNING: USE UV RADIATION EYE AND SKIN PROTECTION DURING SERVICING
.
CAUTION: To prevent suffer of UV radiation, those adjustments must
be completed within 25 minutes.
1. Fan voltage adjustment
Equipment
Digital voltmeter
1. Enter the service mode.
2. Connect the digital voltmeter to the test points listed
below.
3. Select Group no. 250, No. 0 and change the Data
2. Connect the digital voltmeter to the test points listed
below.
3. Select Group no. 250, No. 0 and change the Data
value to adjust the reading of voltmeter to be
specified value.
4. Adjust the remaining adjustments of the No. 1 to 5
listed below.
listed below.
Group-No.
Test Points
Adjustment value
250 - 0
FAN-A1
4.0 ±0.1Vdc
250 - 1
FAN-A1
12.5 ±0.1Vdc
250 - 2
FAN-B1
4.0 ±0.1Vdc
250 - 3
FAN-B1
12.5 ±0.1Vdc
250 - 4
FAN-C1
4.0 ±0.1Vdc
250 - 5
FAN-C1
12.5 ±0.1Vdc
2. Panel type check and setting
3. Flicker adjustment
Input signal No signal
1. Enter the service mode.
2.
2.
Select Group No.30 and change Data value as follows.
Obtain the minimum screen flickering value by adjusting
the value.
Group-No. Adjustment
30 - 3
Red flickering
30 - 4
Green flickering
30 - 5
Blue flickering
4. Keystone offset correction
Input signal No signal
1.
Put the projector on a horizontal place with the adjust-
able feet being minimum range and then enter the
able feet being minimum range and then enter the
service mode.
2. Select Group 102, No.3 and set data value from 0 to 5.
2. Select Group 102, No.3 and set data value from 0 to 5.
3. By pressing the INPUT/ENTER button, the Keystone
Offset adjustment will start.
4. When it has completed, the "OK" message will appear
on the screen.
5. By pressing any button on the projector or the remote
control, the "OK" message will disappear.
(Data value of Group 102, No.3 will be back to 0 for
initial value.)
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SECTION 3 ADJUSTMENTS
<LW373/LW333/LB423/LB383/LB353/LB303>
3. 3. Test points and locations
MAIN board
FAN_B1
FAN_A1
FAN_C1
(Only for PT-LW373, PT-LW333, PT-LB423, PT-LB383 and PT-LB353)
(Only for PT-LB303)
FAN_B1
FAN_A1
FAN_C1
IC3501
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