DOWNLOAD Panasonic PT-LW375 / PT-LW335 / PT-LB425 / PT-LB385 / PT-LB355 / PT-LB305 (serv.man3) Service Manual ↓ Size: 20.3 MB | Pages: 70 in PDF or view online for FREE

Model
PT-LW375 PT-LW335 PT-LB425 PT-LB385 PT-LB355 PT-LB305 (serv.man3)
Pages
70
Size
20.3 MB
Type
PDF
Document
Service Manual
Brand
Device
Projector / LCD PROJECTOR
File
pt-lw375-pt-lw335-pt-lb425-pt-lb385-pt-lb355-pt-lb.pdf
Date

Panasonic PT-LW375 / PT-LW335 / PT-LB425 / PT-LB385 / PT-LB355 / PT-LB305 (serv.man3) Service Manual ▷ View online

5
PREFACE
<LW375/LW335/LB425/LB385/LB355/LB305>
For the block diagrams, schematic diagrams and parts list, refer to each separated booklet "Block and Schematic 
diagrams" and "Parts List" respectively.
CONTENTS
1. Safety Precautions
2. Specifications
SECTION 1 SERVICE INFORMATION
1. Circuits Protection
2. Maintenance/Replacement
3. Notes on service
4. Troubleshooting
SECTION 2 DISASSEMBLY PROCEDURES
1. Mechanical & Electrical Parts Disassembly
2. Optical Parts Disassembly
SECTION 3 ADJUSTMENTS
1. Adjustments Items and Procedures
2. Optical Adjustment
3. Electrical adjustment
4. Firmware Update Procedure
6
PREFACE
<LW375/LW335/LB425/LB385/LB355/LB305>
1. Safety Precautions
1.1. General Guidelines
  - For continued safety, no modification of any circuit must be attempted.
  - Unplug the power cord from the power outlet before disassembling this projector.
  - Use correctly the supplied power cord and must ground it.
  - It is advisable to use an isolation transformer in the AC power line before the service.
  -  Be careful not to touch the rotation part (cooling fan, etc.) of this projector when you service with the upper case removed 
and the power supply turned on.
  -  Observe the original lead dress during the service. If a short circuit is found, replace all the parts overheated or damaged 
by the short circuit.
  -  After the service, all the protective devices such as insulation barriers, insulation papers, shields, and isolation R-C combi-
nations must be properly installed.
  - After the service, check the leakage current to prevent the customer from getting an electric shock.
1.2. Leakage Current Check
  1. Prepare the measuring circuit as shown in Fig.1.
    Be sure to use a voltmeter having the performance described in Table 1.
  2. Assemble the circuit as shown in Fig. 2. Plug the power cord in a power outlet.
  3. Connect M1 to T1 according to Fig. 2 and measure the voltage.
  4. Change the connection of M1 from T1 to T2 and measure the voltage again.
  5.  The voltmeter must read 0.375 V or lower in both of steps 3 and 4. This means that the current must be 0.75mA or  less.
  6.  If the reading is out of the above standard, the projector must be repaired and rechecked before returning to the customer 
because of a possibility of an electric shock.
 
 
 
  
  
M1
M2
Rs
Cs
Rb
10KΩ ±0.1%
0.022µF
±1.0%
Vb
(V) V
Rs: 1500 Ω±0.1%
Cs: 0.22 µF±1.0%
Rb: 500 Ω±0.1%
to T1
or T2
in FIg.2
Weighted leakage current=Vb / 500 (A)
Fig. 1
Isolation transformer
T1
T2
connection
to power outlet
M1
M2
Fig.2
Projector
Measuring
Circuit (Fig.1)
Performance
Voltmeter
(rms reading)
Accurancy: 
≤ 2%
Input resistance: 
≥ 1 MΩ
Input capacitance:  ≤ 200 pF
Frequency range:  15 Hz to 1 MHz
Table 1
1.3. UV Precaution and UHM Lamp Precautions
  - Be sure to unplug the power cord from the power outlet when replacing the lamp.
  -  Because the lamp reaches a very high temperature during its operation, wait until it cools completely when replacing the 
Lamp Unit.
  -  The lamp emits small amounts of UV-radiation, avoid direct-eye contact with the light.
  -  The lamp unit has high internal pressure. If improperly handled, explosion might result.
  - Because the high pressure lamp involves a risk of failure, never touch the lamp wire lead during the service.
7
PREFACE
<LW375/LW335/LB425/LB385/LB355/LB305>
2. Specifications
Power supply
100 V - 240 V 
 (100 V - 240 V alternating current), 50 Hz/60 Hz
Power consumption
3.5 A - 1.5 A, 300 W
In standby mode (when [Standby mode] is set to [Eco]): 0.5 W
In standby mode (when [Standby mode] is set to [Normal]): 6 W
LCD 
panel
Panel size
PT-LW375, PT-LW335
1.5 cm (0.59") (aspect ratio 16 : 10)
PT-LB425, PT-LB385, PT-LB355, 
PT-LB305
1.6 cm (0.63") (aspect ratio 4 : 3)
Display method
Translucent screen LCD panel 3 panels, 3 primary color system
Drive method
Active matrix method
Pixels
PT-LW375, PT-LW335
1 024 000 pixels (1 280 x 800 dots) x 3 panels
PT-LB425, PT-LB385, PT-LB355, 
PT-LB305
786 432 pixels (1 024 x 768 dots) x 3 panels
Lens
Manual zoom
1.2 x
Manual focus
PT-LW375, PT-LB425, PT-LB385, 
PT-LB355
F = 1.6 ~ 1.76, f = 19.16 mm ~ 23.02 mm
PT-LW335, PT-LB305
F = 2.1 ~ 2.25, f = 19.11 mm ~ 22.94 mm
Luminous lamp
230 W UHM lamp 
Light output *
1
PT-LW375
3 600 lm
PT-LW335, PT-LB305
3 100 lm
PT-LB425
4 100 lm
PT-LB385
3 800 lm
PT-LB355
3 300 lm
Contrast ratio *
1
16 000 : 1 (When [Lamp control] is set to [   (Normal)], [Image mode] is set to [Dynamic] 
and [Iris] is set to [On].)
Color system
7 (NTSC, NTSC4.43, PAL, PAL-N, PAL-M, SECAM, PAL60)
Projection size
0.76 m - 7.62 m (30" - 300")
Screen aspect ratio
PT-LW375, PT-LW335
16 : 10
PT-LB425, PT-LB385, PT-LB355, 
PT-LB305
4 : 3
Projection scheme
[Front], [Rear], [Ceiling/Front], [Ceiling/Rear] (Menu setting system)
Built-in speaker
PT-LW375, PT-LW335, PT-LB425,  
PT-LB385, PT-LB355
10 W (monaural) x 1
PT-LB305
2 W (monaural) x 1
Power cable length
1.8 m (70-7/8") 
Cabinet
Molded plastic
Dimensions
Width: 335 mm (13-3/16")
Height: 96 mm (3-25/32") (when adjustable foot shortened)
Depth: 252 mm (9-29/32") 
Weight
PT-LW375, PT-LW335, PT-LB425,  
PT-LB385, PT-LB355
Approx. 2.9 kg (6.39 lbs.) *
2
PT-LB305
Approx. 2.8 kg (6.17 lbs.) *
2
Noise level *
1
When set to [   (Normal)] in [Lamp control] : 39 dB
When set to [   (Eco)] in [Lamp control] : 35 dB
When set to [   (Quiet)] in [Lamp control] : 30 dB
Operating 
environ-
ment
Operating  
environment 
temperature *
3
5 °C (41 °F) to 40 °C (104 °F) (Elevation: below 1 400 m (4 593'))
5 °C (41 °F) to 35 °C (95 °F) (Elevation: 1 400 m (4 593') ~ 2 700 m (8 858'))
Operating  
environment 
humidity
20 % to 80 % (no condensation)
8
PREFACE
<LW375/LW335/LB425/LB385/LB355/LB305>
Remote 
control
Power supply
DC 3 V (AAA/R03/LR03 battery x 2)
Operating range Approx. 5 m (16'4-13/16") (when operated directly in front of receptor)
Weight
63 g (2.22 ozs.) (including batteries)
Dimensions
Width : 44 mm (1-23/32"), Length : 105 mm (4-1/8"), Height : 20.5 mm (13/16")
*1  Measurement, measuring conditions and method of notation all comply with ISO/IEC 21118:2012 international standards.
*2  This is an average value. It may differ depending on individual product. 
*3  When the projector is operated at an elevation of 1 400 m (4 593') or less, if the ambient temperature exceeds 35 °C, 
[Lamp control] will be switched to [  (Eco)] automatically to protect the projector; When the projector is operated at an 
elevation between 1 400 m (4 593') and 2 700 m (8 858'), if the ambient temperature exceeds 30 °C, [Lamp control] will be 
switched to [  (Eco)] automatically to protect the projector.
Note
 
f
The part numbers of accessories and separately sold components are subject to change without notice.
 
r
Connecting terminal
<COMPUTER 1 IN> terminal
1 (High-density D-sub 15 pin female)
RGB signal 
0.7 V [p-p] 75 Ω 
 
HD/SYNC TTL high impedance, automatic positive/negative polarity compatible
 
VD TTL high impedance, automatic positive/negative polarity compatible 
 
(HD/SYNC and VD do not support 3 value SYNC.)
YP
B
P
R
 signal  Y: 1.0 V [p-p] including synchronization signal, P
B
P
R
: 0.7 V [p-p] 75 Ω
Y/C signal 
Y: 1.0 V [p-p] C: 0.286 V [p-p] 75 Ω S1 signal compatible
<COMPUTER 2 IN>
*1
 terminal
1 (High-density D-sub 15 pin female)
RGB signal 
0.7 V [p-p] 75 Ω 
 
HD/SYNC TTL high impedance, automatic positive/negative polarity compatible
 
VD TTL high impedance, automatic positive/negative polarity compatible
 
(HD/SYNC and VD do not support 3 value SYNC.)
<MONITOR OUT> terminal
1 (High-density D-sub 15 pin female)
RGB signal 
0.7 V [p-p] 75 Ω 
 
HD/SYNC TTL high impedance, positive/negative polarity compatible
 
VD TTL high impedance, positive/negative polarity compatible
<VIDEO IN> terminal
1 (Pin jack 1.0 V [p-p] 75 Ω)
<HDMI IN> terminal
1 (HDMI 19 pin, HDCP and Deep color compatible)
Audio signals: Linear PCM (Sampling frequency: 48 kHz/44.1 kHz/32 kHz)
<AUDIO IN> terminal
1 (M3 stereo mini jack, 0.5 V [rms], input impedance 22 kΩ and more)
1 (Pin jack x 2 (L-R), 0.5 V [rms], input impedance 22 kΩ and more)
<VARIABLE AUDIO OUT> 
terminal
1 (M3 stereo mini jack, stereo monitor output compatible,
0 V [rms] to 2.0 V [rms] variable, output impedance 2.2 kΩ and less)
<USB A (VIEWER/WIRELESS)>
*1
 
terminal
USB connector (type A x 1, output DC 5 V, 500 mA maximum)
Memory Viewer / Wireless module (Model No.: ET-WML100) compatible
<USB B (DISPLAY)> terminal PT-LW375, PT-LW335, PT-LB425,  
PT-LB385, PT-LB355
USB connector (type B x 1), only for USB Display 
<USB B > terminal
PT-LB305
USB connector (type B x 1)
<SERIAL IN> terminal
1 (D-sub 9 pin, RS-232C compliant, for computer control use)
<LAN>
*1 
terminal
1 (for RJ-45 network connection, PJLink compatible, 10Base-T/100Base-TX)
*1  Only for PT-LW375, PT-LW335, PT-LB425, PT-LB385 and PT-LB355
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