CORDLESS TELEPHONE
SERVICE MANUAL
FILE NO. 2B0-9912
SX-2809
PUBLISHED IN JAPAN, Dec., 1999
1
CONTENTS
SAFETY PRECAUTIONS ...................................................................................................................... 1
OPERATING CONTROLS ..................................................................................................................... 2
ALIGNMENT PROCEDURE .................................................................................................................. 3
BLOCK DIAGRAMS .............................................................................................................................. 6
SCHEMATIC DIAGRAMS ...................................................................................................................... 8
TROUBLESHOOTING HINTS ............................................................................................................. 12
IC AND TRANSISTOR VOLTAGE CHART ........................................................................................... 18
SEMICONDUCTOR LEAD IDENTIFICATION ..................................................................................... 23
ELECTRICAL PARTS LOCATION .......................................................................................................25
WIRING DIAGRAMS ........................................................................................................................... 27
EXPLODED VIEW AND MECHANICAL PARTS LIST .......................................................................... 29
PARTS LIST ........................................................................................................................................ 33
ASSEMBLY PARTS LIST ..................................................................................................................... 44
SPECIFICATIONS ............................................................................................................................... 45
SAFETY PRECAUTIONS
Before returning any models to the customer, a safety check of the entire instrument should be made.
The service technician must be sure that no protective device built into the instrument by the manufacture
has become defective or inadvertently degraded during servicing.
1.WARNING:
Alterations of the design or circuitry of these models should not be made.
Any design changes or additions such as, but not limited to, circuit modifications, auxiliary speaker
jacks, switches, grounding, active or passive circuitry, etc. may alter the safety characteristics of these
models and potentially create a hazardous situation for the user.
Any design alterations or additions will void the manufacturer's warranty and will further relieve the
manufacturer of responsibility for personal injury or property damage resulting therefrom.
2.PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special characteristics. These characteristics
often pass unnoticed and the protection afforded by them cannot necessarily be obtained by using
replacement components rated for higher voltage, wattage, etc. Replacement parts that have these
special safety characteristics are identified in this manual and its supplements; electrical components
having such features are identified by a
in the schematic diagram and the parts list. Before replacing
any of these components, read the parts list in this manual carefully. The use of substitute replacement
parts that do not have the same safety characteristics as specified in the parts list may create shock, fire
or other hazards.
2
SPREAD SPECTRUM CALLER ID
SPREAD SPECTRUM
ALL DIGITAL
CALLER ID
CORDLESS
TELEPHONE
SX-2809
Liquid Crystal Display (LCD)
REDIAL Button
TALK Button
(TONE) Button
MEM (Memory) Button
PAUSE Button
FUNC (Function)Button
DELETE Button
Charging contacts
TONE/PULSE Switch
DC in 9V Jack
LINE Modular Jack
Base Antenna
Number of calls
Caller ID indication example
Cradle
IN USE/CHARGE LED
PAGE Button
Charging contacts
Dialpad
Dot matrix display
Date
Time
Caller's telephone number
Caller's name
Battery compartment
CID (Caller ID) Button
SELECT Button
FLASH Button
VOL/RING Button
Antenna
OPERATING CONTROLS
HANDSET CONTROLS AND FUNCTIONS
BASE UNIT CONTROLS
LCD
3
ALIGNMENT PROCEDURE
Base Unit
Transmitter Section
Connections
Preset
a) Connect the "TXPWR0 (TP312)" and "TXPWR1 (TP324)" to "G (TP322)" with using wires.
b) Remove the plug J8 from the J7.
c) Supply the DC Power to Base Main PCB (J3).
d) Press the TALK button on Handset unit to link Base with Handset unit.
Alignment Procedure
step
1
Alignment Point Location on Base Main PCB and Base RF PCB
Power
Meter
J7
RF Test
Point
BASE Main Unit
RF
PCB
J3
DC IN
DC9V
AC 120V
60Hz
AC
Adapter
Adjutment
RT301
Remarks
Connect the Power Meter to RF test point on the Base Main PCB.
Adjust RT301 for 11 dBm ±0.5 dB reading on the Power Meter.
RF PCB
Base Main PCB
J3
DC IN
RF TEST POINT
J7
RT301
TXPWR1(TP324)
TXPWR0(TP312)
G(TP322)
4
Handset Unit
Transmitter Section
Connection
Preset
a) Connect the "TXPWR0 (TP512)" and "TXPWR1 (TP524)" to "G (TP522)" with using wires.
b) Remove the plug J606 from the J604.
c) Supply the DC Power to HANDSET Main PCB (J605).
d) Press the TALK button on Handset unit to link Base with Handset unit.
Alignment Procedure
Alignment Point Location on Handset Main PCB and Handset RF PCB
Power
Meter
J604
RF Test
Point
HANDSET Main Unit
RF
PCB
J605
DC IN
DC3.8V
DC
PWR
Supply
step
1
Adjutment
RT501
Remarks
Connect the Power Meter to RF test point on the HANDSET Main PCB.
Adjust RT501 for 11 dBm ±0.5 dB reading on the Power Meter.
J604
RF PCB
J605
RT501
Handset Main PCB
TXPWR1
(TP524)
G(TP522)
TXPWR0
(TP215)
RF TEST POINT