GPRS Tri Band T260 Level 3 procedure Rev.1
mercoledì, gennaio 24, 2001
- MOTOROLA Level3 Authorized -
T260:
NO RX GSM
mode
Is it only GSM RX
problem ?
START
YES
NO
Is present the
RX__VCO signal
(1347,4Mhz) on
C2456 ?
GO TO
Q
on pg.7
(no RX_VCO)
Is there the correct
signal on Output of
FL400 ?
(947,4 Mhz)
Check FL400
NOTE1
or Faulty.
If OK check U150,
U151 NOTE1 or
Faulty.
Is there the correct
signal on C405 ?
Check the presence of
RX275 _GSM on
collector of Q400.
If NOT OK go to
P
on pg.6
If OK check Q400
NOTE1 or Faulty.
Is there the correct
signal on output of
C453 ?
Check FL401 NOTE1
or Faulty.
Is there the correct
signal (400Mhz)
on C460 ?
Check for intermittent
problem.
Check the presence of RX275 on pin1
of Q450 and the RX275_GSM (about
1,2 Volt) on L450.
If NOT OK go to
P
on pg.6
If OK check Q450 NOTE1 or Faulty.
Is there 400Mhz
on C460 ?
Check Q450, U150
and U151 NOTE1
or Faulty.
Is correct the
400Mhz on C480
?
Is correct the
400Mhz on C481
?
Check FL457.
Check Q480
NOTE1 or Faulty.
Check
Q201,Q202,U200
then U800 NOTE1
or Faulty.
NOTE1 : check if any components mentioned are
correctly positioned , have not dry joint and aren't
not phisically damaged .
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
R
For most of Signals Use a
Test PCB as reference.
Connect on J600 Ext_Conn. a RF
generator.
Set frequency of 947,4 Mhz,
Level -30 dBm, Put Pcb in Test
mode and digit 9821#, 450062#
pag.4