Toshiba FT 7007LBR Service Manual
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FT-7007LR
FT-7007LBR
PUBLISHED IN JAPAN, Nov., 1998
CONTENTS
SAFETY PRECAUTIONS ............................................................................................................ 1
OPERATING CONTROLS........................................................................................................... 2
ALIGNMENT PROCEDURE ........................................................................................................ 3
BLOCK DIAGRAMS.....................................................................................................................7
SCHEMATIC DIAGRAMS............................................................................................................9
TROUBLESHOOTING HINTS ................................................................................................... 13
IC AND TRANSISTOR VOLTAGE CHART ............................................................................... 20
SEMICONDUCTOR LEAD IDENTIFICATION........................................................................... 24
ELECTRICAL PARTS LOCATION............................................................................................. 26
WIRING DIAGRAM.................................................................................................................... 27
EXPLODED VIEW AND MECHANICAL PARTS LIST............................................................... 28
PARTS LIST............................................................................................................................... 32
ASSEMBLY PARTS LIST .......................................................................................................... 40
SPECIFICATIONS ..................................................................................................................... 41
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 indentified 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.
1
OPERATING CONTROLS
HANDSET CONTROLS AND FUNCTIONS
Speed Dial Index Card(back)
Write all your memorized telephone
numbers.
TALK Button
0-9, æ, # Buttons
TONE
MEM Button
FLASH Button
GHI
PQ
RS
TONE
MEM
1
4
7
TALK
CHANNEL
ABC3DEF
2
JKL6MNO
5
TUV
8
OPER
0
FLASH RDL/P
25
CHANNEL
WX
YZ
/BATT
9
#
Helical Antenna
TALK/BATT.LOW LED
CHANNEL Button
REDIAL/PAUSE Button
Rechargeable Battery Pack
(back)
BASE UNIT CONTROLS AND FUNCTIONS
DC in 9V Jack
Telephone Modular Jack
Charging Contacts
T-P(T ONE-PULSE) Switch
CHARGE
POWER
PAGE
25CHANNEL
COMPANDOR
NOISE
REDUCTION
SYSTEM
FT-7007
TOSHIBA
Charging Contacts
Base Antenna
CHARGE LED
POWER LED
PAGE Button
2
ALIGNMENT PROCEDURE
Base Unit / Transmitter
Test Equipment Required and Connections
• Oscilloscope • Dummy Load, 50-ohm
• Frequency Counter • AC Power Supply : 120V, 60Hz (With AC Adapter)
AC Adapter
(120V 60Hz)
BASE Unit
RF Test
Point
Dummy Load
(50-ohm)
Oscilloscope
Frequency Counter
TX VCO
Test Point
Digital Voltmeter
Preset
a) Set T/P SW to Pulse Mode.
b) Turn on AC power while the Page key is being depressed.
c) Release the Page key 2 seconds later, then the TX Mode is entered (CH21).
Alignment Procedure
Step Adjustment Remarks
Connect the oscilloscope across a 50-ohm load to RF test point.
1L8
Set the digital voltmeter at the test point of TX VCO.
Adjust L8 to indicate DC 2.8V ±0.05V.
2
!
Connect the frequenc y counter across a 50-ohm dummy load to RF test point. Make
sure that the frequency is 46.770 MHz ±1500Hz.
Alignment Point Location on Main PCB
RF Test Point TX VCO Test Point
L8
P
S1
T
T/P SW
3
Receiver
Test Equipment Required and Connections
• SG: RF Signal Generator, 49.830MHz • Dummy Load, 600-ohm
• Digital Voltmeter • AF SSVM
• SINAD Meter
Preset
SG
MOD=1kHz
DEV=±3kHz
BASE Unit
RF Test
Point
TEL Jack
AC Adapter
(120V 60Hz)
Dummy Load
(600-ohm)
a) Set T/P SW to Pulse Mode.
b) Turn on AC power while the Page key is being depressed.
c) Release the Page key 2 second later, then the TX Mode is entered (CH21).
d) Press the Page key 4 times, then the DUPLEX Mode is entered (CH21).
Alignment Procedure
Step Preset to Adjustment Remarks
AF SSVM
SINAD
Meter
Digital Voltmeter
Connect the SG to the RF test point.
Connect the digital voltmeter to the test point of the RX VCO.
Adjust L4 to indicate DC 3.3V ±0.05V.
Set the digital voltmeter at the test point of DISCRI.
Adjust L2 to indicate 2.0V ±0.05V.
Connect the AF SSVM to the TEL LINE through a 600- ohm dummy
load, then adjust RT2 to indicate AC -6dBm ±0.5dBm.
1
No modulation
2
No modulation
3
SG: 1mV
SG: 1mV
SG: 1mV
1kHz ±3kHz
deviation
L4
L2
RT2
Press the Page key 2 tim es. Turn RT1 to fully clockwise and co nfir m
4
No modulation
SG: 0.2"V
RT1
the STATUS LED turns off.
Then adjust RT1 to turn to counterclockwise slowly where the STATUS
LED just turns on.
Alignment Point Location on Main PCB
RT2
RT1
L2
DISCRI Test Point RX VCO Test Point
L4
RF Test Point
P
S1
T
T/P SW
4
Portable / Transmitter
Test Equipment Required and Connections
• Oscilloscope, 100MHz • Dummy Load, 50-ohm
• Frequency Counter • DC Power Supply, 2.4V
Frequency Counter
Digital Voltmeter
DC Power Supply
2.4V
PORTABLE
Batt Terminal
RF Test
Point
Dummy Load
(50-ohm)
Oscilloscope
Preset
Turn Power On (Connect battery) while depressing " æ" and " # " keys. A beep will be heard. Press the " 1 " key,
then the TX Mode is entered (CH1).
Alignment Procedure
Step Adjustment Remarks
1 L506
2
!
Set the digital voltm eter at the test point of TX VCO, then adjust L50 6 to indicate DC
0.8V ±0.05V.
Connect the frequenc y counter across a 50-ohm dummy load to RF test point. (See
page 25) Make sure that the frequency is 48.760 MHz ±1500Hz.
Alignment Point Location on Main PCB
TX VCO Test PointRF Test Point
L506
5
Receiver
Test Equipment Required and Connections
• SG: RF Signal Generator, 46.770MHz • Dummy Load, 150-ohm
• Noise Meter • DC Power Supply: 2.4 V
• Digital Voltmeter • SINAD Meter
SG
MOD=1kHz
DEV=±3kHz
DC Power Supply
2.4V
PORTABLE
RF Test
Point
Batt Terminal
SP
Terminal
Digital Voltmeter
Dummy Load
(150-ohm)
NOISE METER
Balance Input
SINAD
Meter
Preset
Turn Power On (Connect Battery) while depressing "
" and " # " keys. A beep will be heard.
æ
Alignment Procedure
Step Preset to Adjustment Remarks
Press the " 1 " key, then the TX Mode is entered.
Set the digital voltm eter at the test point of RX VCO ( See page 25),
then adjust L503 to indicate DC 2.0 V ±0.05V.
Press the “ 4 ” key, then the RX Adjust Mode is entered.
Connect SG to RF Test Point. Set the digital voltmeter to the DISCRI
Test Point. Adjust L502 to indicate DC 0.9V ±0.05V.
1
No modulation
2
No modulation
SG: 1mV
SG: 1mV
L503
L502
SG: 1mV
3
1kHz ±3kHz
RT502
deviation
Connect the NOISE MET ER to the SP Terminal thr ough a 150-ohm
dummy load, then adjust RT502 to indicate 140 ±5 mV.
Press the “MEMO” key, then the SQ Adjust Mode is entered.
SG: 0.09"V
4
1kHz ±3kHz
RT501
deviation
Connect SG to RF Test Point. Turn RT501 to fully clockwise and
confirm the Ringer SP501 does not r ing.
Adjust RT501 to turn to counter clockwise slowly where the ringer
SP501 rings.
Alignment Point Location Main PCB
DISCRI Test Point
RT502
L502
RT501
RX VCO Test PointRF Test Point
L503
6
Base Unit
BLOCK DIAGRAMS
7
Handset
8
DISCRI
TEST POINT
SCHEMATIC DIAGRAMS
10
Base Unit
TX VCO TEST POINT
9
RX VCO
TEST POINT
RF TEST POINT
DISCRI
TEST POINT
12
Handset
TX VCO
TEST POINT
11
RX VCO
TEST POINT
RF TEST POINT
TROUBLESHOOTING HINTS
1. The bell does not ring.
When the PAGE SW of the
base is pressed, does the
ringer on the handset ring?
OK
When the TEL SG is joined
with the base to make bell
signal, is there pulse wave on
Pin 4 of IC2?
OK
Then, is there pulse wave
on Pin 24 of IC3?
OK
By using voltage chart,
check IC3.
OK
NG
NG
NG
NG
By using voltage chart, check
IC2.
OK
Check TEL network primary
circuit.
Check IC3, C85, R45 and
R44.
IC3 is defective.
NG
See 2. The bell does not ring
& page does not ring.
IC2 is defective.
Check the surrounding
circuit where the voltage is
incorrect.
13
2. The bell does not ring & page does not ring.
Can the base and handset be
connected?
OK
Press handset DIAL key
while in TALK MODE,
can key touch sound be
heard from the ringer?
OK
When the PAGE SW S2 of
the base is pressed, does
pin22 of IC3 change from
high to low?
NG
NG
NG
See 3. The base and handset
cannot be connected.
When the key of the handset is
pressed, can the pulse output
at pin 38 of IC502 be seen?
OK
At the Q505 collector, can the
pulse wave be seen?
OK
Check RINGER SP501.
Check S2, R58 and R73.
NG
NG
Check IC502.
Check R565, R586 and Q505.
OK
Check IC3 and its peripheral
circuit.
14
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