Ares Communications Technology . , INC
.
2051P Service manual 1~3 V3.0- .doc
DB-2051P Service Manual
2004/12/17 Page 35 of 90
Confidential Document
SYMPTOM 8
LED is not bright:
Check whether backlighting is
at a “on” state
in the function setting.
Set the backlighting
to “on” state.
Pressing the key, check whether
check whether a high voltage trigger
signal in T8_
2
is sent from IC7.
Check whether IC7 and
R44 are not well soldered;
if any, then re-solder or
replace the relevant part(s)
in worst case.
Check whether
T8 is driven.
Check whether T8 is not well
soldered; if any, then re-solder or
replace the relevant part(s) in
worst case.
Check whether
LED is bright.
Check whether R55, R54,
R135, R137, D6, D7, D8, D14,
D17, D20, D21, and D22 are
not well soldered; if any, then
re-solder or replace the relevant
part(s) in worst case.
END
N
N
N
N
After the phone is
switched on
Y
Y
Y
Y
Y
