Samsung SPR5150 Troubleshooting

7

°ÿBlind Slot : The Slot Before The Active Slot.
°ÿREF CLK : In case of Baseset, It is oscillated continuously.

Blind Slot

-

-

-

Low

-

High

PLL Data

PLL CLK

Low

CLK

-

High

-

-

High

Level Low

STATUS

. Trouble Shooting

1

. Trouble Shooting of RF Module

Check Points
of U10 for
H/S and B/S

Idle Slot

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)

-

-

-

Low

-

Low

-

-

High

-

-

High

-

-

High

Level

Low

Rx

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

-

-

-

-

-

Samsung Electronics

19

Trouble Shooting

20

Samsung Electronics

2

. Base/Remote connections between RF Module and U

10

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

21

Samsung Electronics

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

22

Samsung Electronics

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

23

Samsung Electronics

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

24

Samsung Electronics

1. REPLACE LCD

2. CHECK SDA AND SCL PATTERNS