motorola C350, C450 Debug Guide Level 3
C450
Debug Guide Level3
Motorola Confidential Propietary
DEBUG GUIDE
C450
LEVEL 3
No power up............................................................................................pag. 2, 3 y 4
No Tx in GSM.........................................................................................pag. 5
No Tx in DCS..........................................................................................pag. 6
No Rx.......................................................................................................pag. 7
Procedure for flash´s recover…………...................................................pag. 10, 11 y 12
Written by: Juan A. Ortiz / 27-01-04 Versión 1.2
Aproved by: Luis Alberto Lázaro
1
C450
p
Debug Guide Level3
Motorola Confidential Propietary
Connect the phone with battery
from USB port to Radiocomm,
switch on the phone.
Is the phone switch on?
Yes
END
No
Yes
Disassembly the mobile
and see the keypad, ¿is
it dirty or bad
ositioned?
Replace
keypad mylar
No
Measure in C949, is
there voltage:
B+ = 3.6v?
No
Replace
U920
Yes
Make the wachdog,
make a shortcut about
R917´s contacts
Go to “A”
pag.3
NO
POWER UP
Written by: Juan A. Ortiz / 27-01-04 Versión 1.2
2
Aproved by: Luis Alberto Lázaro
C450
Debug Guide Level3
Motorola Confidential Propietary
“A”
Are there that voltages?:
DIG_1.875= 1.8v on C933
AUD 2.65= 2.6v on C921
are ok?
No
Yes
No
Measure
CS0B on the R710,
Is there FLASH´s
signal?(Fig.1)
NO
POWER UP
Replace
U900
Replace
U701
Yes Fig. 1
No
Measure on CS1B(TP5043),
Is there SRAM´s signal?
(Fig. 2)
Replace
U705
Yes
Fig. 2
Go to “B”
pag. 4
Written by: Juan A. Ortiz / 27-01-04 Versión 1.2
3
Aproved by: Luis Alberto Lázaro
C450
Debug Guide Level3
Motorola Confidential Propietary
No
Is there the clock´s signal of
Yes
“B”
Measure on
Y901,
26MHz?(Fig. 3)
Replace
Y901
Fig. 3
No
Is there the clock´s signal of
Measure on
Y900,
32MHz?(Fig. 3)
Replace
Y900
Yes
Replace
PCB
Written by: Juan A. Ortiz / 27-01-04 Versión 1.2
Aproved by: Luis Alberto Lázaro
4
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