motorola C168 Debug Guide
V1.0
C168
Level 3
Debug Guide
10/31/05
INDEX
1. Debug guide.............................................................................................................................3
1.1 Baseband circuit Debug guide...................................................................................... 3
1.1.1 Phone is Dead ....................................................................................................... 3
1.1.2 SIM Card Detection Error .................................................................................... 4
1.1.3 Audio Fail............................................................................................................. 5
1.1.3.1 Headset Fail..................................................................................................... 5
1.1.3.2 Speaker Fail..................................................................................................... 6
1.1.3.3 Handset Microphone Fail............................................................................... 7
1.1.3.4 Earphone Speaker Fail...................................................................................8
1.1.4 LCM Fail .............................................................................................................. 8
1.1.5 Charger Fail .......................................................................................................... 9
1.1.6 Vibrator Fail........................................................................................................ 10
1.1.7 FM function Fail................................................................................................. 10
1.2 Radio Frequency circuit troubleshooting................................................................... 11
1.2.1 26MHz System clock fail ................................................................................... 11
1.2.2 RF signal diagram in GSM900 Tx mode............................................................ 12
1.2.3 RF signal diagram in DCS1800 TX mode.......................................................... 13
1.2.4 RF signal diagram in GSM900 Rx mode ........................................................... 14
1.2.5 RF signal diagram in DCS1800 RX mode..........................................................15
2
1. Debug guide
1.1 Baseband circuit Debug guide
1.1.1 Phone is Dead
The phone is dead
Voltage at C620 =3.6V
Yes
Voltage at
C210=3.6V
C215=1.5V(VRRTC)
TP211=1.5V(RESPWON)
Yes
Clock at TP210
=~ 32.768KHz
Yes
Press PWON and then we
can detect falling edge at
TP207
Voltage at
C213=1.8V(VRRAM)
C212=1.8V(VRMEM)
C217=1.5V(VRDBB)
C211=2.8V(VRIO)
C216=2.8V(VRABB)
NO
NO
NO
NO
Contact problem
Defective IOTA (U202) or
PCB
Check R205 whether
32768Hz is available
Defective IOTA (U202 ) or PCB
Defective Calypso (U201),
X201 or PCB
Yes
Clock at C201
= 26M Hz
Yes
See section
"Download Failed"
NO
Check status of Pin3 of
U601 is high (TCXOEN).
NO
Yes
Defective CALYPSO
(U201) or PCB
Please refer to RF part
Faulting Finding Chart of “Phone is Dead”
3
1.1.2 SIM Card Detection Error
SIM Card
Detection Error
Check if signal level at
VRSIM=1.8 / 3.0V , SIMRST,
SIMCLK(=3.25MHz), SIMIO
Are correct
YES
Check SIM Card
Type or SIM Card
if well inserted
Fault Finding Chart of “SIM Card Error”
NO
Check SIM socket
Soldering well
YES
Defective IOTA
U202
4
1.1.3 Audio Fail
1.1.3.1 Headset Fail
Earphone doesn't work
Defective J102
YES
Insert Earphone and
check if handset mode
is detected
YES
Measure AC Signal of
L101 ( R ) & L106 ( L )
YES
NO
NO
Check R112 if any level
change
Check U102_PIN6 if
any level change
Check AC signal at
U102 Pin 4?
Check AC signal at
U105 Pin10, 11 (input)
& Pin 14, 15 (output)
Check U104 Pin 4 & 8
if any level change
Check AC signal at U104
Pin3(COM1), 2(NO), 5(NC)
Pin9(COM2), 10(NO), 7(NC)
YES
U105 is OK
YES
Defective J102 or , R112
NO
NO
NO
NO
and R117,R118 are not
well mounted
Defective CALYPSO
NO
NO
U201
Defective U102
Defective U105
Defective U201
Defective U104
Measure Signal
(Microphone) of L102
YES
Measure Signal
(EP_status) of R112
YES
Defective U201
If Pin 5 is abnormal, then Defective U202
If Pin 2 is abnormal, then Defective U702
NO
NO
Check J102 are well
mounted
YES
Check if Earpiece is
plugged in well
Check J102_PIN4 if any
level change
Yes
Defective U201,U202
NO
Defective J102 and L104
Fault Finding Chart of “Headset fail”
Defective J102
are not well mounted
5
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