DOWNLOAD Sharp XG-NV21SE (serv.man4) Service Manual ↓ Size: 147.96 KB | Pages: 29 in PDF or view online for FREE

Model
XG-NV21SE (serv.man4)
Pages
29
Size
147.96 KB
Type
PDF
Document
Service Manual
Brand
Device
Projector / Resetting the total lamp timer, The optical unit outline, Covergence and focus adjustment, Electrical adjustment, Adjusting the PC board, Troubleshooting table - Page 15-43
File
xg-nv21se-sm4.pdf
Date
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31
XG-NV21SE
XG-NV21SM
XG-NV21SA
TROUBLE SHOOTING TABLE 
(Continued)
Checking IC806 (3-D noise reduction circuit)
and its peripheral circuits
Yes
No
Check the buffer circuit of Q814 thru 
Q816, Q905 and Q906.
Yes
No
Are there signal outputs at pins (55)
(Y signal) and (51)(chroma signal) of 
IC806?
Check IC806, IC807 (memory) and 
their peripheral circuits. 
Yes
No
Are there signal outputs at the 
emitters of Q817 (Y signal) and Q910 
(chroma signal)?
Check the low-pass circuit around 
Q817, Q907 and Q910.
Check IC816 and IC801 (RGB signal 
output circuit).
Are there signal inputs at pins (40)
(Y signal) and (45)(chroma signal) of 
IC806?
No colour or unusual tone (NTSC, PAL)
Yes
No
Go back to the signal processing 
block.
Yes
No
Check the oscillation of X801 and 
X802, and their peripheral circuits. 
Check IC803, IC814 and their 
peripheral circuits.
Are there signal outputs at pins 
(46)(R-Y) and (45)(B-Y) of IC801?
Is there chroma signal input at pin 
(20) of IC801?
No colour or unusual tone (SECAM)
Yes
No
Go back to the signal processing 
block.
Yes
No
Check the X802 oscillation, IC801 
and their peripheral circuits. 
Check IC801, IC814 and their 
peripheral circuits.
Is there chroma signal input at pin 
(29) of IC801?
Are there signal outputs at pins 
(46)(R-Y) and  (45)(B-Y) of IC801?
32
XG-NV21SE
XG-NV21SM
XG-NV21SA
TROUBLE SHOOTING TABLE 
(Continued)
No or unusual Y signal
Yes
No
Go back to the signal processing 
block.
No
Check IC801 and its peripheral 
circuits.
Yes
No
Check IC811 and its peripheral 
circuits as well as IC805 (AGC).
Yes
Check IC803 and its peripheral 
circuits.
Is there Y signal output at pin (17) of 
IC811?
Is there Y signal output at pin (40) of 
IC801?
Is there Y signal input at pin (21) of 
IC801?
No or unusual horizontal sync
Yes
No
Check IC801 and its peripheral 
circuits.
Yes
No
Is there horizontal sync pulse output 
at pin (9) of IC603?
Check the pulse shaping circuit of 
IC602 and IC603.
Check IC604 and its peripheral 
circuits, and go to "Trouble shooting 
table for PC I/F unit".
Is there horizontal sync pulse output 
at pin (56) of IC801?
No or unusual vertical sync
No
Check IC801 and its peripheral 
circuits.
Yes
Check IC604 and its peripheral 
circuits, and go to "Trouble shooting 
table for PC I/F unit".
Is there vertical sync pulse output at 
pin (4) of IC801?
33
XG-NV21SE
XG-NV21SM
XG-NV21SA
TROUBLE SHOOTING TABLE 
(Continued)
Yes
Checking the output PWB unit
Are there signal inputs at 
P1404, P1405, SC1501 and 
SC1502? 
Are voltages applied to EA 
connectors?
Yes
No
No
No
Check IC1109, IC1209, 
IC1309 and their peripheral 
circuits.
Are there signal outputs at pins 
(30) and (40) of  IC1109, 
IC1209 and IC1309?
Yes
No
Check the switching circuit of 
IC1104, IC1204, IC1304 and 
their peripheral circuits, as well 
as the amplifier circuit of 
IC1102, IC1202 and IC1302 
and their peripheral circuits.
Are there signal inputs at pin 
(16) of IC1111, IC1211 and 
IC1311?
Yes
No
Check the input and output 
signals at IC1106, IC1206 and 
IC1306. Check also IC1111, 
IC1211, IC1311 and their 
peripheral circuits.
Are there signal outputs at pins 
(23), (25), (27), (33), (35) and 
(37) of IC1111, IC1211 and 
IC1311?
Yes
Yes
Yes
No
If there is no signal input at 
pins (8) and (23) of  
SC1101, SC1201 and 
SC1301, check IC5509 
and their peripheral 
circuits.
No
No
If there is no signal input at 
pins (1) and (24) of  SC1101, 
SC1201 and SC1301, check 
the switching circuit and 
amplifier circuit of  IC1113, 
IC1213 and IC1313, and their 
peripheral circuits.
Are there signal inputs at 
SC1101, SC1201 and 
SC1301?
Check IC1406, IC1408 
and their peripheral 
circuits.
Is the R.G.B. panel signal fed?
Check the R.G.B. panel.
Check the circuit of R.G.B. 
panel before feeding.
If there is no signal at EA 
connector, go to "Checking 
the power unit block.
If there is no signal at P1404 
and P1405, go to "Trouble 
shooting table for PC I/F unit".
If there is no signal at SC1501 
and SC1502, go to the video 
system block. 
34
XG-NV21SE
XG-NV21SM
XG-NV21SA
TROUBLE SHOOTING TABLE 
(Continued)
No audio output
Yes
No
Check the input, the video-unit 
switching circuit of IC6001 and IC  
6002, and their peripheral circuits.
Are there audio signal outputs at pins 
(5) and (27) of SC6001?
Yes
No
Check the amplifier of IC305 and 
IC306 and their peripheral circuits, 
the IC1409 control voltage, the P1501 
connectors, etc.
Are there audio signal outputs at pins 
(1) and (2) of P1403?
Yes
No
Check IC7301 and its peripheral 
circuits.
Are there audio signal outputs at pins 
(4) and (6) of IC7301?
Check IC7301 and its peripheral 
circuits, and the SP connectors and 
speakers.
If the voltage at pin (7) of IC7301 is 
not as specified, check Q5501, 
Q5502 and their peripheral circuits.
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