XG-P20XE (serv.man5). Service Manual Part 2 - Troubleshooting, Block and overall diagrams - p36-87 - Sharp Projector Service Manual (repair manual)

xg-p20xe (serv.man5) service manual
Model
XG-P20XE (serv.man5)
Pages
11
Size
792.61 KB
Type
PDF
Document
Service Manual
Brand
Device
Projector / Service Manual Part 2 - Troubleshooting, Block and overall diagrams - p36-87
File
xg-p20xe-sm5.pdf
Date

Read Sharp XG-P20XE (serv.man5) Service Manual online

36
XG-P20XU
XG-P20XE
XG-P20XD
TROUBLE SHOOTING TABLE
Checking the PWB performance
RGB input in trouble
Feed test pattern signal from 
PC.
Yes
No
Use specified cable.
Is specified cable connected 
between PC and projector?
Yes
No
Power circuit in trouble.
Is supply voltage as specified?
Yes
No
Check the connectors, starting 
from the PC input  circuit.
Does image appear?
Video input in trouble
Go to "Checking the video unit 
circuit".
Through-output in trouble
Through-output circuit in 
trouble.
Remote control in trouble
Go to "Checking the remote 
control".
Check the PC I/F unit.
37
XG-P20XU
XG-P20XE
XG-P20XD
TROUBLE SHOOTING TABLE 
(Continued)
Checking the video unit circuit    
Yes
No
Check the IC5555 selector switch, 
terminal voltage and input circuit.
Yes
No
Is there video signal input at pins
 (76) and (88) of IC4502?
Check the low-pass and buffer 
circuits of Q4501,Q4502,and 
Q4508,Q4509.
Yes
No
Are there signal outputs at pins (83) 
and (84) of IC4502?
Check IC4502,IC4503 and their 
peripheral circuits (bias).
Yes
No
Check the buffer circuits of Q4503 
thru Q4504. Is the signal as 
specified?
Check IC4501,IC4311and their 
peripheral circuits.
(Go to "Checking the output 
PWB unit".)
Is there video signal output at P401 
pin (9).
Check Q4503 thru Q4504 and their 
peripheral circuits.
Checking the video system
Yes
No
Go to "Lamp fails to light-up".
Yes
No
Is specified voltage fed to EA  
connectors?
Check the power circuit and its parts.
Yes
No
Are there signal inputs at pins (9), 
(19) and (21) of SC401?
Are there signals at pin (7) of IC5555?
Are there signal outputs at pins 
(1),(12) and (14) of SC4303?
No
Check the IC5555 and its 
peripheral circuits.
Yes
Check SC4303,P4303 and 
their peripheral circuits.
(Go to "Checking the output 
PWB unit".)
No
Check IC4311, IC4502, 
IC4501and their peripheral 
circuits.
Is the lamp on?
38
XG-P20XU
XG-P20XE
XG-P20XD
TROUBLE SHOOTING TABLE 
(Continued)
Checking RGB signal output circuit
Yes
No
Check the IC3302 of input unit 
and its peripheral circuits.
Yes
No
Are there output waveforms at pins 
(16), (18), (20) of IC4301?
Check the IC4301 selector switch, 
terminal voltage and  peripheral 
circuits.
Are there RGB input waveforms at 
pins (1), (3) and (5) of IC4301?
Checking the 480P, 720P signals.
Yes
No
Go to "Checking the signal unit 
circuit". (signal unit-3/3)
Yes
No
Check the IC4301 selector switch 
terminal voltage and peripheral circuits?
Check SC4301,P4301 and their 
peripheral circuits.
Go to "Checking the output PWB 
unit".
Are there signal inputs at pins (8), 
(10) and (12) of SC4301?
Are there output waveforms at pins 
(16) (18) (20) of IC4301 (RGB signal)?
Check SC4301,P4301 and their 
peripheral circuits.
Go to"Checking the output PWB unit".
39
XG-P20XU
XG-P20XE
XG-P20XD
TROUBLE SHOOTING TABLE 
(Continued)
No or unusual Y signal
Yes
No
Check IC4502 and its peripheral 
circuits.
No
Check IC4501 and its peripheral 
circuits.
Yes
No
Check IC4311 and its peripheral 
circuits.
Yes
Check SC4303 and its peripheral 
circuits.
Is there Y signal output at pin (5) of 
IC4311?
Is there Y signal output at pin (7) of 
IC4501?
Is there Y signal input at pin (84) of 
IC4502?
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Here you can read online and download Sharp XG-P20XE (serv.man5) Service Manual in PDF. XG-P20XE (serv.man5) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp XG-P20XE (serv.man5) Projector. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.