Motorola C168 User manual

C168
Level 3
Debug Guide
10/31/05
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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
Voltage at C620 =3.6V
Voltage at
C210=3.6V
C215=1.5V(VRRTC)
TP211=1.5V(RESPWON)
Defective IOTA (U202) or
PCB
NO
NO
Press PWON and then we
can detect falling edge at
TP207
Defective IOTA (U202 ) or PCB
NO
Defective CALYPSO
(U201) or PCB
Check status of Pin3 of
U601 is high (TCXOEN).
Clock at C201
= 26M Hz
NO
Please refer to RF part
Yes
See section
"Download Failed"
Yes
Yes
Yes
Yes
The phone is dead
Voltage at
C213=1.8V(VRRAM)
C212=1.8V(VRMEM)
C217=1.5V(VRDBB)
C211=2.8V(VRIO)
C216=2.8V(VRABB)
Clock at TP210
=~ 32.768KHz
Check R205 whether
32768Hz is available
Defective Calypso (U201),
X201 or PCB
Contact problem
Yes
NO
NO
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
Check SIM socket
Soldering well
Defective IOTA
U202
Check SIM Card
Type or SIM Card
if well inserted
YES
YES
NO
Fault Finding Chart of “SIM Card Error”
4

1.1.3 Audio Fail
1.1.3.1 Headset Fail
Earphone doesn't work
Insert Earphone and
check if handset mode
is detected
Check R112 if any level
change
Defective J102 or , R112
and R117,R118 are not
well mounted
Measure AC Signal of
L101 ( R ) & L106 ( L )
Measure Signal
(Microphone) of L102
Measure Signal
(EP_status) of R112
Defective U201
YES
YES
YES
NO
NO
NO
NO
YES
NO
Check U102_PIN6 if
any level change
Defective CALYPSO
U201
NO
Check AC signal at
U102 Pin 4?
YES
Check J102 are well
mounted
Check J102_PIN4 if any
level change
NO
Yes
Defective U201,U202
Defective J102 and L104
are not well mounted
Defective J102
Check AC signal at
U105 Pin10, 11 (input)
& Pin 14, 15 (output)
Defective U102
Defective U105
NO
Check U104 Pin 4 & 8
if any level change Defective U201
NO
U105 is OK
Check AC signal at U104
Pin3(COM1), 2(NO), 5(NC)
Pin9(COM2), 10(NO), 7(NC)
Defective U104
NO
YES
If Pin 5 is abnormal, then Defective U202
If Pin 2 is abnormal, then Defective U702
YES
NO
Check if Earpiece is
plugged in well
YES
Defective J102
Fault Finding Chart of “Headset fail”
5

1.1.3.2 Speaker Fail
Speaker doesn't work
Defective U101, U201,
L31
YES
NO
Check mechanical
fabrication
Measure speaker
signal on L31, C308,
C309
Check if speaker is
well contacted
Check CN401 Pin12,
14, 16 and 18
Defective CN401 B2B
connector
NO
Defective Speaker
NO
YES
YES
Faulting Finding Chart of “Speaker fail”
6

1.1.3.3 Handset Microphone Fail
Microphone doesn't work
Check if MIC FPC pad TP1,
TP2 solder well
Defective MIC
Measure L105, C111 and
C112 any AC signal
Yes
Yes
Check MIC FPC
Solder process
No
Defective U202
No
Check if CN401 contact well
Yes
Defective CN401
No
Faulting Finding Chart of “Microphone fail”
7

1.1.3.4 Earphone Speaker Fail
YES
Check Earphone
Impendence is
32 Ohm
Earphone doesn't
work
YES
Check R315, R316 If
any AC signal change
NO Check R315, R316
solderring
Check L32 If any AC signal
change Defective L32
NO
YES
Defective Earphone
Faulting Finding Chart of “Receiver fail”
1.1.4 LCM Fail
LCD does not work
Check if CN301 is well
mounted
Defective connector
CON301
Defective U202
Measure Signal of
CON301 Pin 4, 14 is 1.8V ?
NO
YES NO
Measure Signal of
CON301 Pin5 ~ Pin12 any
signal wave ? Defective U201
YES
Faulting Finding Chart of “LCD fail”
8

1.1.5 Charger Fail
Charger does not work
Measure CON303
Pin 3 have voltage
> 4.0V ?
Measure U304 Pin 1 & 3
is 0V ?
Defective CON303
Defective U304
YES
NO
YES
NO
Measure U308 Pin 7, 8 have
voltage > 4.0V ?
Measure
U310 Pin 2 and Pin 3 > 4.0V
& U306 Pin 3, Pin 4, Pin 5 > 4.0V
& U302 in/out put > 4.0V
Defective U308
Defective U310
or U306 or U302
Measure U308 Pin 5, 6 have
voltage > 4.0V ? Defective U308
YES
YES
Maybe R303 bad solderMeasure R303 voltage > 4.0 V
Defective U301Measure U301 Pin 2 = 0V
YES
YES
NO
NO
NO
NO
NO
Faulting Finding Chart of “Charger fail”
9

1.1.6 Vibrator Fail
Vibrator does not work
Measure the signal
of Vibrator_on at R406
> 2.8V
Defective U41
Defective U202
NO
YES
Faulting Finding Chart of “Vibrator failed”
1.1.7 FM function Fail
FM function Failed
Check C703, C707, R708
is well mounted
Defective solder
C706, C707, R703
YES
NO
Check I2C Signal at
R705, R706 Defective U201
YES
NO
Check U702 Pin 15 AFR
& Pin 16 AFL
Is AC Signal
Defective U702
YES
NO
Check Audio path
Faulting Finding Chart of “FM function faults”
10

1.2 Radio Frequency circuit troubleshooting
1.2.1 26MHz System clock fail
No 26MHz clock
Check if U601 Pin 5 is
2.8V Check if U601 Pin 1 > 3.2V
Check U606 Pin 1
or U606 Pin 3 If
26MHz Sine wave
exists
Check if U601 Pin 3
> 2.8V
Check Battery Cell is
empty ?
Defective U602
(voltage regulator)
Defective U201 or
U202
Yes
No
Yes
Yes
No
No
Yes
Check U604 Pin 8 If
26MHz Sine wave
exists No Replace U604
Defective U606No
Fault Finding chart of 26MHz clock part
11

1.2.2 RF signal diagram in GSM900 Tx mode
GSM900 Tx fail
(BB lives)
Check if R603, C611
has modulaed RF signal
Check if C613 has
amplified RF signal
Yes
No Check if
TP605~608
have Sine wave
Defective U201
or U202
Defective U604
Check if C617 has
amplified RF signal
Defective CON601
Check if
TP614 has
ramp signal
Defective U607
(T/R switch)
Yes
Yes
No
Yes
Defective U608
or U201
No Defective
U605 (PA)
Defective
U202 or
U201
No
Yes
Yes
No
Check if U607 Pin
10 > 2.8V & U607
Pin 2 = 0V
NO
Fault Finding chart of GSM900 Tx part
12

1.2.3 RF signal diagram in DCS1800 TX mode
DCS1800 Tx fail
(BB lives)
Check if R602, C612
has modulated RF
signal
Check if C623 has
amplified RF signal
Yes
No
Check if
TP605~608
have TxIQ sin
wave
Defective U201
or U202
Defective U604
Check if C617 has
amplified RF signal
Defective CON601
Check if
TP614 has
ramp signal
Defective U607
Yes
Yes
No
Yes
Defective U608
or U201
No
Defective
U605 (PA) Defective U202
No
Yes
Yes
No
Check if U607 Pin
10 = 0V & U607 Pin
2 > 2.8V
NO
Fault Finding chart of DCS1800 Tx part
13

1.2.4 RF signal diagram in GSM900 Rx mode
GSM900 Rx fail
(BB Lives)
Check if C617
has input RF
signal
Defective
CON601
Check if C609,
C610 has input
RF signal
No
Check
TP605~608 if
RxIQ waveform
is correct
Defective U202
Defective
U602 or L606
Defective U604
Yes
Yes
No
Check if U604
Pin 1, Pin2 and
Pin3 has correct
waveform
Yes
No Defective
U201
No
Check if L606
has input RF
signal
Defective U607
No No
Yes
Yes Yes
Check if
U607 Pin 10 = 0V
& U607 Pin 2 = 0V
Defective U608
or U201
Fault Finding chart of GSM900 Rx part
14

1.2.5 RF signal diagram in DCS1800 RX mode
DCS1800 Rx fail
(BB Lives)
Check if C617
has input RF
signal
Defective
CON601
Check if C607,
C608 has input
RF signal
No
Check
TP605~608 if
RxIQ waveform
is correct
Defective U202
Defective U603 or
L607
Defective U604
Yes
Yes
No
Check if U604
Pin 1, Pin2 and
Pin3 has correct
waveform
Yes
No Defective
U201
No
Check if L607
has input RF
signal
Defective U607
No No
Yes
Yes Yes
Check if U607 Pin
10 = 0V& U607 Pin
2 = 0V
Defective U608 or
U201
Fault Finding chart of DCS1800 Rx part
15