Page 1
7
. Trouble Shooting
1
. Trouble Shooting of RF Module
Check Points
of U10 for
H/S and B/S
T_ENABLE
(PIN4)
T_PWR_RMP
(PIN5)
T_GMSK
(PIN7)
VCO_BND_SW
(PIN8)
SYNTH_LOCK
(PIN9)
S_ENABLE
(PIN10)
S_DATA
(PIN11)
S_CLK
(PIN12)
S_PWR
(PIN13)
REF_CLK
(PIN14)
VDD_RF
(PIN16)
SLICE_CTRL
(PIN18)
R_DATAP
(PIN20)
R_DATAM
(PIN21)
R_ENABLE
(PIN22)
RSSI_AN
(PIN23)
Idle Slot
-
-
-
Low
-
Low
-
-
High
-
-
High
-
-
High
Level
Low
Rx
Blind Slot
-
-
-
Low
-
High
PLL Data
PLL CLK
Low
CLK
-
High
-
-
High
Level Low
STATUS
Active Slot
-
-
-
Low
2.9 V
Low
-
-
Low
CLK
2.9 V
Low For
Short Time
Demodulated
Output Signal
Approximately
1.4 V
Low
Level High
(Over 1 V)
Idle Slot
High
Low
High
High
-
Low
-
-
Low
-
-
-
-
-
-
-
Tx
Blind Slot
High
Low
High
High
-
High
PLL Data
PLL CLK
Low
CLK
-
-
-
-
-
-
Active Slot
High
High
Transmit
Data
High
2.9 V
Low
-
-
Low
CLK
2.9 V
-
-
-
-
-
Blind Slot : The Slot Before The Active Slot.
REF CLK : In case of Baseset, It is oscillated continuously.
17
Samsung Electronics
Page 2
Trouble Shooting
18
Samsung Electronics
2
. Base/Remote connections between RF Module and U
10
Page 3
3
. Trouble Shooting of Handset Logic
3-1
. Power Problem
HL1
NO WORKING
POWER PROBLEM
Trouble Shooting
BATT
VOLTAGE
> 3.4 V
Y E S
PIN 4 of
U14 is 3.3 V
Y E S
U10 WORKS
Y E S
OK
N O
N O
N O
CHARGE FULLY
CHECK U14,Q15 and U11
U10 PROBLEM
19
Samsung Electronics
Page 4
Trouble Shooting
3-2. No RX Audio
LOGIC/HARDWARE
HL2
NO AUDIO (RX)
PROBLEM
AF SIGNAL
is FOUND AT PIN45,46
of U10
Y E S
AF SIGNAL
is FOUND THROUGH
THE RECEIVER
UNIT
Y E S
OK
N O
N O
GOTO RF MODULE
1. CHECK THE RECEIVER UNIT
2. CHECK COMPONENTS
AND PATTERNS
20
Samsung Electronics
Page 5
3-3. No TX Audio
Trouble Shooting
HL3
NO AUDIO (TX)
LOGIC/HARDWARE
PROBLEM
AF SIGNAL is
FOUND AT PIN39,40
of U10
Y E S
AUDIO DATA
is FOUND AT
PIN 70 OF U10
Y E S
OK
N O
N O
RF MODULE PROBLEM
1. CHECK MIC PERFORMANCE
2. CHECK MIC BIAS
3. CHECK COMPONENTS AND
PATTERNS
CHECK U10
21
Samsung Electronics
Page 6
Trouble Shooting
3-4. No Key Action
HL4
NO KEY ACTION
KEY-SCAN is OK
AT EACH MATRIX
Y E S
N O
1. CHECK EACH CONNECTION
2. CHECK KEY-SCAN STATUS
FROM U10
3. CHECK THE RUBBER is OK
OK
3-5. No Display
HL5
NO DISPLAY
CONNECTIONS of
VDD, SDA, SCL
AND C131 AROUND
LCD
Y E S
N O
MAKE THE CONNECTIONS CORRECT
LCD is OK
OK
N O
22
Samsung Electronics
1. REPLACE LCD
2. CHECK SDA AND SCL PATTERNS
Page 7
3-6. No Beeptone / No Ring
HL6
NO BEEPTONE, BELL
Trouble Shooting
U10 GENERATES
SIGNAL AT
PIN61,62
Y E S
BUZZER is OK
OK
N O
N O
CHECK U10
1. REPLACE BUZZER
2. CHECK PATTERNS AND
AROUND COMPONENTS
23
Samsung Electronics
Page 8
Trouble Shooting
3-7. Charge Failure
HL7
NO CHARGE
THE
VOLTAGE
OF CONTACT
TERMINALS
>4 V
N O
GO TO BL4
Y E S
Q20
TURNS
ON
N O
Q18
TURNS
ON
N O
CHECK Q18, R126, R125
AND U10
Y E S
Y E S
CHECK D1, BATTERY AND
BATTERY SPRING
CHECK R124, R123 AND Q20
24
Samsung Electronics
Page 9
4
. Trouble Shooting of Baseset Logic
4-1
. Power Problem
BL1
POWER PROBLEM
Trouble Shooting
INPUT
VOLTAGE of
C83 > 9 V
Y E S
DC
OUTPUT
VOLTAGE of
U2=5 V
U3=3.3 V
Y E S
DC
DC
VCC of U10 is 3.3 V
Y E S
DC
N O
N O
N O
1. CHECK PERFORMANCE of
ADAPTOR
2. CHECK ISOLATION BETWEEN
VCC AND GND
CHECK U2,U3 AND ITS
CONCERNED COMPONENTS
CHECK PATTERNS BETWEEN MPU
(U10) AND REGULATORS(U2,U3)
OK
25
Samsung Electronics
Page 10
Trouble Shooting
4-2. No Work
BL2
NO WORK
RING LED
TURNS ON FOR A
MOMENT
N O
CLOCK CIRCUIT
WORKS
Y E S
RESET
PULSE CAN BE
FOUND AT THE PIN99
OF U10
Y E S
POWER is
SUPPLIED TO
U10
Y E S
Y E S
N O
N O
Y E S
N O
Y E S
OK
CHECK X1, C92 AND VCC of U10
CHECK C39,Q13,Q14,R79 AND U3
GO TO BL1
DATA AND
ADDRESS BUS is
ACTIVE
Y E S
OK
N O
26
Samsung Electronics
CHECK U11 AND CONCERNED
COMPONENTS
Page 11
4-3. No Ring
BL3
NO RING
Trouble Shooting
SQUARE
WAVE IN THE
PIN4 OF U4
Y E S
SQUARE
WAVE IN THE PIN 57
OF U10
Y E S
CHECK U10
4-4. Charge Failure
N O
N O
GO TO HL6
CHECK LINE CONNECTION
CIRCUIT, ZD3, U4 AND
CONNECTED COMPONENTS
CHECK PATTERN
BL4
IN PUT
VOLTAGE OF
C84 > 9 V
Y E S
DC
CHECK R5, CN1 AND
CONTACT SPRING
N O
CHECK POWER ADAPTOR,
CN30 AND PATTERN
GO TO HL7
27
Samsung Electronics
Page 12
Trouble Shooting
4-5. Failure of Hook-off
FAILURE of HOOK-OFF
BL5
48 V
DC
is FED TO TIP AND
RING
Y E S
DOES RELAY WORK?
Y E S
IN THE OFF
HOOK MODE,
VOLTAGE AT PIN1
OF U502 > 6
Y E S
OK
N O
N O
N O
1. CHECK TEL-LINE CONNECTION
2. CHECK ISOLATION BETWEEN
TIP AND RING
3. CHECK MODULAR JACK(CN50)
1. CHECK VCC of RELAY AND
PERFORMANCE of RELAY
2. CHECK Q3,Q5 AND PIN71 of U10
1. CHECK Q9,Q10 AND ZD4
2. CHECK U502 WORKS AND
PERFORMANCE of COMPONENTS
28
Samsung Electronics
Page 13
4-6. Failure of Tone Dialing
BL6
FAILURE of
TONE DIALING
Trouble Shooting
CHECK
THE DIALING MODE
is TONE
Y E S
DTMF CAN
BE FOUND AT PIN5
of U422
Y E S
DTMF CAN
BE FOUND AT TIP
AND RING
Y E S
OK
N O
N O
N O
CHANGE DIALING MODE
TO TONE MODE
CHECK R68 AND PIN46 of U10
CHECK ALL COMPONENTS
CONCERNED WITH HOOK-OFF
FAILURE
29
Samsung Electronics
Page 14
Trouble Shooting
4-7. Failure of Pulse Dialing
FAILURE of PULSE DIALING
BL7
CHECK
THE DIALING MODE
is PULSE
Y E S
PULSE
is DERIVED TO Q12
of BASESET
Y E S
Q9, Q10 AND Q12
WORKS
Y E S
PULSE
CAN BE FOUND AT TIP
AND RING
Y E S
N O
N O
N O
N O
CHANGE TO PULSE MODE
CHECK PATTERNS
of CONTROL PORT
1. CHECK ITS BIAS
2. CHECK PERFORMANCE of Q12
CHECK ALL COMPONENTS
CONCERNED TO HOOK-OFF
FAILURE
OK
30
Samsung Electronics
Page 15
4-8. TX Audio Failure
BL8
TX AUDIO FAILURE
Trouble Shooting
AF SIGNAL
CAN BE FOUND
AT PIN45 AND
46 of U10
Y E S
AF SIGNAL
is FOUND AT PIN1 of
U422
N O
PIN6 of U422 is HIGH
Y E S
CHECK U422
Y E S
N O
Y E S
N O
CHECK U10 AND IT’S ARROUND
PATTERNS
CHECK TEL-LINE CONNECTION
CHECK THE PIN55 OF U10 AND R99
GO TO HL3
31
Samsung Electronics
Page 16
Trouble Shooting
4-9. RX Audio Failure
RX AUDIO FAILURE
BL9
AF SIGNAL
CAN BE FOUND AT PIN7
of U422
Y E S
AF SIGNAL
CAN BE FOUND AT
PIN12 of U422
Y E S
AF SIGNAL
CAN BE FOUND AT
PIN36 ,37OF U10
Y E S
GO TO HL2
N O
N O
N O
GO TO BL5
CHECK PERFORMANCE of U422
CHECK PATTERNS AND
SOLDERING AROUND
U422 AND U10
32
Samsung Electronics
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