Page 5
lunedµ 20 dicembre 1999
- MOTOROLA CONFIDENTIAL PROPRIETARY -
Dual band Modulus 3 level 3 debug rev 1.0
NO RX
GSM/DCS
Connect on J300 connector an RF
generator , set frequency equal to
947,4 MHz level -30dBm . Set pcb
in test mode and digit RX test
command 450062#
Is IF at 400 MHz
frequency present
on C498 at
correct level ?
Go to "
A " on
pag .06
Is RX_LO at
800 MHz
frequency present
on CR249 ?
Check Q203 for correct bias
:base = 1,7 V;collector= 2,7 V;
emitter = GND .check also for
any faulty on CR 249 and
components surround it
With PCB in stand by
check for data presence
on SPI BUS:
TP 205
TP 206
Problem could be
U800,try to
resolder it,after
replace
component.
Check
U200 for
faulty
Check for data presence on:
- R299 BDR
- R299 BFSR
- R287 BCLKR
Note: digit 450062# for every
point of measure
Does RX ACQ signal
works correct whenever
you digit 450062# test
command , check this on
TP "RX_ACQ"?
See receiver timing below
NO
YES
NO
YES
YES
YES
NO
NO
NOTE: check if any components mentioned is correctly
positioned , has not dry joint and is not damaged . If all is ok
replace it . If problem is still the same send BOARD IN htc.
note: all the signal & voltage present
in this procedure has to be clear and
at correct level ; compare them with a
good pcb
YES
NO
