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C168
Level 3
Debug Guide
10/31/05
V1.0
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
NO
Voltage at C620 =3.6V Contact problem
Yes
Voltage at
C210=3.6V NO Defective IOTA (U202) or
C215=1.5V(VRRTC) PCB
TP211=1.5V(RESPWON)
Yes
Clock at TP210 NO Check R205 whether Defective Calypso (U201),
=~ 32.768KHz 32768Hz is available X201 or PCB
Yes
Press PWON and then we
can detect falling edge at
TP207
Voltage at
C213=1.8V(VRRAM)
C212=1.8V(VRMEM) NO
Defective IOTA (U202 ) or PCB
C217=1.5V(VRDBB)
C211=2.8V(VRIO)
C216=2.8V(VRABB)
Yes NO Defective CALYPSO
(U201) or PCB
Clock at C201 NO Check status of Pin3 of
= 26M Hz U601 is high (TCXOEN).
Yes
Please refer to RF part
Yes
See section
"Download Failed"
Faulting Finding Chart of "Phone is Dead"
3
1.1.2 SIM Card Detection Error
SIM Card
Detection Error
Check if signal level at
NO
VRSIM=1.8 / 3.0V , SIMRST, Check SIM socket
SIMCLK(=3.25MHz), SIMIO Soldering well
Are correct
YES YES
Check SIM Card
Defective IOTA
Type or SIM Card
U202
if well inserted
Fault Finding Chart of "SIM Card Error"
4
1.1.3 Audio Fail
1.1.3.1 Headset Fail
Earphone doesn't work
Defective J102
YES
Insert Earphone and NO NO Defective J102 or , R112
Check R112 if any level
check if handset mode and R117,R118 are not
change
is detected well mounted
YES
Measure AC Signal of NO Check U102_PIN6 if NO Defective CALYPSO
L101 ( R ) & L106 ( L ) any level change U201
YES
Check AC signal at NO
Defective U102
U102 Pin 4?
YES
Check AC signal at NO
U105 Pin10, 11 (input) Defective U105
& Pin 14, 15 (output)
U105 is OK
NO
Check U104 Pin 4 & 8
Defective U201
if any level change
YES
Check AC signal at U104 NO
Pin3(COM1), 2(NO), 5(NC) Defective U104
Pin9(COM2), 10(NO), 7(NC)
If Pin 5 is abnormal, then Defective U202
If Pin 2 is abnormal, then Defective U702
Measure Signal NO Check J102 are well
Defective J102
(Microphone) of L102 mounted
YES
YES
Check if Earpiece is
plugged in well
NO
Measure Signal NO Check J102_PIN4 if any Defective J102 and L104
(EP_status) of R112 level change are not well mounted
YES
Yes
Defective U201 Defective U201,U202
Fault Finding Chart of "Headset fail"
5
1.1.3.2 Speaker Fail
Speaker doesn't work
Check if speaker is NO
Defective Speaker
well contacted
YES
Check CN401 Pin12, NO Defective CN401 B2B
14, 16 and 18 connector
YES
Measure speaker NO Defective U101, U201,
signal on L31, C308,
L31
C309
YES
Check mechanical
fabrication
Faulting Finding Chart of "Speaker fail"
6
1.1.3.3 Handset Microphone Fail
Microphone doesn't work
Measure L105, C111 and No
Defective U202
C112 any AC signal
Yes
No
Check if CN401 contact well Defective CN401
Yes
Check if MIC FPC pad TP1, No Check MIC FPC
TP2 solder well Solder process
Yes
Defective MIC
Faulting Finding Chart of "Microphone fail"
7
1.1.3.4 Earphone Speaker Fail
Earphone doesn't
work
NO
Check R315, R316 If Check R315, R316
YES
any AC signal change solderring
YES
NO
Check L32 If any AC signal
Defective L32
change
YES
Check Earphone
Impendence is Defective Earphone
32 Ohm
Faulting Finding Chart of "Receiver fail"
1.1.4 LCM Fail
LCD does not work
Check if CN301 is well NO Defective connector
mounted CON301
YES
NO
Measure Signal of
CON301 Pin 4, 14 is 1.8V ? Defective U202
YES
Measure Signal of
CON301 Pin5 ~ Pin12 any Defective U201
signal wave ?
Faulting Finding Chart of "LCD fail"
8
1.1.5 Charger Fail
Charger does not work
Measure CON303 NO
Pin 3 have voltage Defective CON303
> 4.0V ?
YES
Measure U304 Pin 1 & 3 NO
Defective U304
is 0V ?
YES
Measure U308 Pin 7, 8 have NO
Defective U308
voltage > 4.0V ?
YES
Measure
U310 Pin 2 and Pin 3 > 4.0V NO Defective U310
& U306 Pin 3, Pin 4, Pin 5 > 4.0V or U306 or U302
& U302 in/out put > 4.0V
YES
Measure U308 Pin 5, 6 have NO
Defective U308
voltage > 4.0V ?
YES
NO
Measure R303 voltage > 4.0 V Maybe R303 bad solder
YES
NO
Measure U301 Pin 2 = 0V Defective U301
Faulting Finding Chart of "Charger fail"
9
1.1.6 Vibrator Fail
Vibrator does not work
Measure the signal NO
of Vibrator_on at R406 Defective U202
> 2.8V
YES
Defective U41
Faulting Finding Chart of "Vibrator failed"
1.1.7 FM function Fail
FM function Failed
Check C703, C707, R708 NO Defective solder
is well mounted C706, C707, R703
YES
Check I2C Signal at NO
Defective U201
R705, R706
YES
Check U702 Pin 15 AFR NO
& Pin 16 AFL Defective U702
Is AC Signal
YES
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 Check if U601 Pin 1 Check Battery Cell is
No No
2.8V > 3.2V empty ?
Yes Yes
Check U606 Pin 1
or U606 Pin 3 If Check if U601 Pin 3 Defective U201 or
No Defective U606 No
26MHz Sine wave > 2.8V U202
exists
Yes Yes
Check U604 Pin 8 If
Defective U602
26MHz Sine wave No Replace U604
(voltage regulator)
exists
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 Defective U201
Check if R603, C611
No TP605~608 No
has modulaed RF signal or U202
have Sine wave
Yes
Yes
Check if
Check if C613 has TP614 has Defective U604
No
amplified RF signal
ramp signal
No
Yes Yes
Check if U607 Pin Defective
Check if C617 has Defective U608 Defective
NO 10 > 2.8V & U607 No U202 or
amplified RF signal or U201 U605 (PA)
Pin 2 = 0V U201
Yes Yes
Defective U607
Defective CON601 (T/R switch)
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
Check if R602, C612
TP605~608 Defective U201
has modulated RF No No
have TxIQ sin or U202
signal
wave
Yes
Yes
Check if
Check if C623 has
No TP614 has Defective U604
amplified RF signal
ramp signal
No
Yes Yes
Check if U607 Pin Defective Defective
Check if C617 has
NO 10 = 0V & U607 Pin
amplified RF signal U605 (PA) U202
2 > 2.8V
Yes Yes No
Defective U608
Defective CON601 Defective U607
or U201
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
Defective
has input RF No
CON601
signal
Yes
Check if L606 Check if
Defective U608
has input RF No U607 Pin 10 = 0V No
or U201
signal & U607 Pin 2 = 0V
Yes Yes
Check if C609,
Defective Defective U607
C610 has input No
U602 or L606
RF signal
Yes
Check Check if U604
TP605~608 if Pin 1, Pin2 and Defective
No No
RxIQ waveform Pin3 has correct U201
is correct waveform
Yes Yes
Defective U202 Defective U604
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
Defective
has input RF No
CON601
signal
Yes
Check if L607 Check if U607 Pin
Defective U608 or
has input RF No 10 = 0V& U607 Pin No
U201
signal 2 = 0V
Yes Yes
Check if C607,
Defective U603 or Defective U607
C608 has input No
L607
RF signal
Yes
Check Check if U604
TP605~608 if Pin 1, Pin2 and Defective
No No
RxIQ waveform Pin3 has correct U201
is correct waveform
Yes Yes
Defective U202 Defective U604
Fault Finding chart of DCS1800 Rx part
15
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