background image
SERVICE MANUAL
PUBLISHED IN JAPAN, Jan., 2000
FILE NO. 2B0-9913
SG-1000
CORDLESS TELEPHONE


background image
-- 1 --
CONTENTS
SAFETY PRECAUTIONS ...................................................................................................................... 1
OPERATING CONTROLS ..................................................................................................................... 2
ALIGNMENT PROCEDURE .................................................................................................................. 3
BLOCK DIAGRAMS ............................................................................................................................... 6
SCHEMATIC DIAGRAMS ...................................................................................................................... 8
TROUBLESHOOTING HINTS ............................................................................................................. 16
IC AND TRANSISTOR VOLTAGE CHART ......................................................................................... 22
SEMICONDUCTOR LEAD IDENTIFICATION ..................................................................................... 31
ELECTRICAL PARTS LOCATION ...................................................................................................... 37
WIRING DIAGRAMS ............................................................................................................................ 41
EXPLODED VIEW AND MECHANICAL PARTS LIST ........................................................................ 43
PARTS LIST......................................................................................................................................... 47
ASSEMBLY PARTS LIST .................................................................................................................... 68
SPECIFICATIONS ............................................................................................................................... 69
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 manufacturer
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.


background image
-- 2 --
OPERATING CONTROLS
BASE UNIT CONTROLS
HANDSET CONTROLS
(
) button (down arrow button)
(
) button (up arrow button)
0-9, ,
Dial buttons
TONE button
Battery compartment
VOL/RING button
FUNC (Function) button
CID (Caller ID) button
TALK button
Liquid Crystal Display (LCD)
Antenna
Charging contacts
Number 1 ( ) button, Number 3 ( ) button
DELETE button
FLASH button
MEM (Memory) button
PAUSE button
SELECT
button
RDL (Redial) button
IN USE
CHARGE
POWER
PAGE
IN USE LED
CHARGE LED
POWER LED
PAGE button
Cradle
LINE modular jack
DC IN 9V jack
Tone/Pulse switch
Base antenna
Dot matrix display
16 digits by 3 lines dot matrix LCD. Shows the time, caller
ID, memory location, instructions, error messages, and
other information.
The back light of the LCD operates in the following manner:
Turns on during an incoming CID call.
Turns on for 5 seconds and then off when a button is
pressed (except in battery low status).
Date
Time
Number of calls
Caller
¢ s telephone number
Caller
¢ s name


background image
-- 3 --
ALIGNMENT PROCEDURE
Base Unit
Transmitter Section
Connections
Preset
a) Connect the "TXPWR0" and "TXPWR1" to "GND" using wires.
b) Remove the antenna wire from the J302.
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
Adjustment
Remarks
1RT301
Connect the Power Meter to RF test point(J302) on the BASE RF PCB.
Adjust RT301 for 12 dBm
±0.5 dB reading on the Power Meter.
2CT1
Connect the Frequency counter to REF CLK test point on the Base Main
PCB.
Adjust CT1 for 9.6MHz
±10Hz reading on the Frequency counter.
Alignment Point Location on Base Main PCB and RF PCB
Power
Meter
J3
DC IN
DC 9V
AC
Adapter
AC 120V
60Hz
J302
RF Test
Point
Base Main PCB
RF
PCB
Frequency
Counter
TP1
REF CLK
Test Point
J2
TEL
JACK
J3
DC IN
CT1
Base Main PCB
J302
RT301
GND
TXPWR1
Base RF PCB
TXPWR0
RF Test
Point
REF CLK
Test Point


background image
-- 4 --
HANDSET UNIT / TRANSMITTER
Connections
Preset
a) Connect the "TXPWR0" and "TXPWR1" to "GND" using wires.
b) Supply the DC Power to HANDSET Main PCB (Battery terminals).
c) Press the TALK button on Handset unit to link Base with Handset unit.
Alignment Point Location on HANDSET Main PCB and RF PCB
Alignment Procedure
Step
Adjustment
Remarks
1RT501
Connect the Power Meter to RF test point(J502) on the HANDSET RF PCB.
Adjust RT501 for 12 dBm
±0.5 dB reading on the Power Meter.
2CT601
Connect the Frequency counter to REF CLK test point on the HANDSET
MAIN PCB.
Adjust CT601 for 9.6 MHz
±10Hz reading on the Frequency counter.
Power
Meter
Battery terminal
DC IN
DC 3.8V
DC PWR
Supply
J502
RF Test
Point
HANDSET Main PCB
RF
PCB
Frequency
Counter
REF CLK
Test Point
Handset Main PCB (Bottom)
CT601
RF PCB
BAT+
Terminal
RF
Test Point
RT501
J502
GND
TXPWR1
TXPWR0
REF CLK
Test Point
BAT-
Terminal