Samsung SP-R5100 Service Manual
Cordless Telephone
Manual
SP-R5100
S E C R E T
SERVICE
Cordless Telephone
1.
Safety Precautions
2.
Specification
3. Function Structures
4. Test Mode
5.
Component Pin Array
6. Alignment & Adjustment
7.
Trouble Shooting
8.
PCB Views
CONTENTS
9.
Electrical Parts List
10.
Exploded Views and Parts List
11. Block Diagram
12. Schematic Description and Diagrams
1 2
. Schematic Description and Diagram
1
. CIRCUIT DESCRIPTIONS OF HANDSET RF
1-1
I N T R O D U C T I O N
The system uses the T.D.D.method that the system receives RX signals and transmits TX signals through
only one antenna and carrier frequency. The system also uses the TDMA method using one slot among
The frequency range of TX and RX is from
The equipment uses DECT RF module.
1-2
D E S C R I P T I O N
1
) A N T E N N A
The system uses the antenna of •Î/4herical type to communicate with the microwave signal.
2
) RF module
The operating voltage of this module is 3.6Vdc normally and supplied by BATT directly.
The clock of module uses
DEMODE OUT,VCC REFand RSSI siginal.
This RF module°Øs pin assignments are as follows.
1 3.8 2 4
1 8 8 1.7 9 2
MHz. The outgoing siginals of module are SLICE OUT,
MHz to
1 8 9 7.3 4 4
M H z .
2 4
slots.
A) Vcc : 9and
B) GND : 1,3,5,6,7,
C) TX PA RAMP : It controls transmit power AMP.(pin number : 8)
D) SLICE OUT The reference voltage of data comparator (pin number :
E) DEMODE OUT : This pin presents demodulated signal (pin number :
F) SLICE CTRL : It controls the tracking or holding of data slice (pin number :
G) PLL CTRL : This pin controls PLL power (pin number :
H) PLL ENABLE : This pin is synthesizer enable input(pin number :
I) BATT. SAVE : This controls the main power of RF module (pin number :
J) PLL DATA : This is synthesizer data input pin binary (pin number :
K) TX ENABLE : This controls the power of transimitting circuit(pin number :
L) PLL CLOCK : This is synthesizer clock input for serial registers(pin number :
M) RX ENABLE : This controls RX path and antenna switch(pin number :
N) VCO BND S/W : This is the input of VCO band switch (pin number :
O) VCC REF : This is 2.9Vdc reference output for BMC interface (pin number :
P) TX DATA : This is transmit data input(pin number :
Q) SYS CLOCK : This is RF module clock input pin(pin number :
R) RSSI : This is RSSI output pin(pin number :
1 0
are TX POWER SUPPLY.
2 8
is the supply voltage for other circuits within RF Module.
1 5,3 0,3 1
In case of
In case of
Its pin number is
In case of
In case of
In case of
In case of
In case of
In case of
In case of
In case of
In case of
high impedance state
° ∞H°±
° ∞L°±
° ∞H°±
° ∞L°±
° ∞H°±
° ∞L°±
° ∞H°±
° ∞L°±
° ∞L°±
° ∞H°±
° ∞L°±
3 2
and
.
state, it turns on the TX power AMP.
state, it turns off the TX power AMP.
5
state, it holds reference voltage.
state, it is S-field tracking mode.
1 8
) .
state, it keeps data slice.
state, it is tracking mode.
2 0
). This pin is active
2 1
) .
state, the RF module°Øs power is supplied.
2 2
, the power is to supply TX circuit.
, the RX path turn on.
2 7
) .
, it selects transmitting ferquency.
, it selects receiving frequency.
2 6
). When it is not active this pin goes to
2 4
) and its frequency is
1 9
) and its voltage level is related to signal level.
1 6
) .
1 4
2 5
) .
).
1 3
1 7
) .
) .
° ∞L°±
) .
2 3
2 9
) .
) .
s t a t e .
1 3.8 2 4
M H z .
48
Samsung Electronics
Schematic Description and Diagrams
2
.CIRCUIT DESCRIPTIONS OF HANDSET LOGIC
2-1
I N T R O D U C T I O N
The HANDSET LOGIC B°ØD controls its RF part and TX & RX AUDIO signals, and controls charging
current and performs lots of user oriented functions by sensing the keys, and controls LCD displays,
MIC and buzzer.
2-2
KEY PA D
3
The KEY PAD consists of
usually controls these ports to keep its level high. Respectively, the
the CPU and the CPU usually controls these ports to keep its level low. If a certain key is pressed,
the column and the row are short- circuited and the column
The CPU senses the change of the voltage condition, then changes all row
pulse(strobe) signal to 6rows in order. At this moment, there is no signal on the unpressed column, but the
strobe signal is detected on the pressed column. That indicates the key is pressed.
6
matrix key. The 6rows are connected with 6ports of CPU and the CPU
°ø
3
columns are connected with 3ports of
s voltage become high.
°Ø
s level low and generates
°Ø
2-3
E E P R O M
The EEPROM used in the HANDSET is PCF
The EEPROM stores the initial data, it°Øs ID number, telephone numbers for the memory dial function and
country adaptation value including volume data.
2-4
RSSI DETECT O R
The RF module outputs DC voltage in proportion to the RF input level through the internal RSSI circuit and
the MPU checks the point of the DC voltage level. This pin is used for channel and slot scanning.
2-5
POWER SUPPLY CIRCUIT
The power used in HANDSET is a rechargeable BATTERY(
batteries of 1.2V Ni-MH in serial.
2-6
TX & RX AUDIO CIRCUITS
The TX audio signal from the CONDENSER MIC goes to the MPU whose reference level is
The MPU converts this audio signal to digital using internal DSP. These digital voice signals are transmitted to
BASE SET by HAND SET RF.
The RX digital signal from the BASE RF inputs the HAND SET RF module and then that digital siginal is
converted into analog audio by the MPU. These audio signals go to the ear piece directly.
8 5 9 4
C which is made by PHILIPS.
3.6
VDC,
5 3 0
mAH) which is combined with
4
mVrms.
3
2-7
CURRENT CHARGE CIRCUIT
0.1
This equipment°Øs charging method uses normal and trickle charge. Normal charge is
after full discharge and then this equipment goes to trickle charge mode continuously.
Normal or trickle mode is selected by the MPU pin xx. In case of normal charge mode, the MPU goes to
H I G H°±state and turns on Q
° ∞
1 8
2 0
. The Q
is controlled by Q
Samsung Electronics
49
1 8
.
c for
1 5
hours
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