PG-A20X (serv.man12). Troubleshooting tables - Sharp Projector Service Manual (repair manual). Page 3

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33
PG-A20X
YES
YES
YES
YES
YES
NO
Checking the 
microprocessor 
peripherals
Is a voltage of about 3.3V 
DC applied to pins (3) and 
(5) of IC1703?
Check IC1703 and its 
peripheral circuits, or IC1702 
and its peripheral circuits.
Is the lamp access lid 
open? Is the P2006 (LF) 
tight in the socket? 
Check IC2002 and its 
peripheral circuits.
Check IC8202, IC8203, 
IC2601 and their 
peripheral circuits.
Check IC1704 and its 
peripheral circuits.
NO
Is about DC 2.5V applied 
between pins (5) and (8) of 
IC1704?
NO
Check IC8009 and its 
peripheral circuits.
NO
See if the fan is running as 
specified. Or check IC8003 
and its peripheral circuits.
NO
Is about DC 2.5V applied 
between pins (4) and (3) of 
IC8009?
Is there about DC3V 
applied at pin (21) of 
IC2002? Do the D0 thru D7 
signals appear as pulse 
signals on the oscilloscope 
screen?
Fully close the lamp access 
lid. Or insert the P2006 (LF) 
tightly in the socket.
YES
Check IC8010, IC8011 and 
their peripheral circuits.
NO
Is there 133-MHz clock 
output at pin (6) of IC8010? 
Is there 75-MHz clock 
output at pin (6) of IC8011?
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