XR-20S (serv.man14). Trouble shooting - Sharp Projector Service Manual (repair manual). Page 3

Check P2501 for breakage 
and solder crack and 
peripheral resistance for 
solder crack.

Check SC9101 for 
breakage and solder crack.

Is there any vertical stripe 
(block noise) on the 

Is the screen all black?

Is approx. 7 V applied to 
TL9303?

Is 3.27 V applied to IC2231 
pin(1) and 1.8 V to TL2231?

Is 400 MHz on IC2241 pin 
(20)?

Is approx. 26 V applied to 
TL9301?

Is approx. -26 V applied to 
TL9302?

Check IC2231, IC2201, 
and their peripheral 
circuits.

The main PWB and DMD 
PWB are in poor contact. 
Check the contact surface 
for dirt and smear.
Check the DMD connector 
for breakage.
Reassemble the DMD, 
optical mechanism, and 
DMD PWB.

Check IC2241 and 
peripheral circuits.

Check IC9301 and 
peripheral circuits.