Page 15
- MOTOROLA CONFIDENTIAL PROPRIETARY -
GSM Krunch - Level 3 Procedure vers.1.1
03/05/1999
7
Is the
signal ok
902.4MHz
ok at Q303
base
Check bias Q303 DRIVER and
NOTE 1
Q303
driver
B=0.6V
E=0V
C=B+
Is the
signal ok
902.4MHz
ok at C304
terminals
Check TX_Attenuator and CR390 and bias of the PAC IC
and NOTE 1
Remenber you can check the signals below with:
11062#, 1205, 310#(time slot random)
( see page 34 35)
PAC IC
U310
1
7
14
8
GND
RF feedback
GND
TX_EN 2.65V
from Q501
236mV
239mV
EXC. 920mV
(NO TX = about 1.9V)
TX_EN 2.65V
from Q501
237mV
TX_KEY 2.75
0.012V
( NO TX= about 2.2V)
AOC 240mV
from SMOC
check L501
on this line
( NO TX= about 850 mV)
Check
R354(dry joint or missing)
Check
R354
8
yes
no
yes
no
DET_DECT 923mV
PWR step 12-15= 1V
PWR step 11-05= 0V
SAT_DECT 2.68V
feedback to SMOC
from
A
page14
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