
— 7 —
Preset
a) Connect the handset RF unit to the handset main unit.
b) Connect DC power supply to battery connector on the handset unit.
c) Turn the DC power supply on while pressing “
∗
” and “ # ” keys, and keep pressing the keys continuously for
approximate 2 seconds.
d) Release keys when entering TEST mode 1 with beep.
Alignment Point Location on Handset Main PCB and Handset RF PCB
AC Voltmeter
HANDSET Unit
AF
Terminal
Dummy Load
(150-ohm)
RF SG
DC 3.8V
J603
Battery
Connector
+
RF
Test Point
SP
Connector
DC Power Supply
DC Voltmeter
-
+
-
Receiver Section
Connections
Alignment Procedure
Step
1
2
3
Preset to
SG: 1mV
No modulation
SG: 1mV
1 kHz
±
8kHz
Deviation
SG: -6.0 dB
µ
V
1kHz
±
8kHz
Deviation
Remarks
Press the 4 key to enter the TEST Mode 4. Connect the RF Signal
Generator to the RF test point on the handset MAIN PCB. Make sure that
the frequency is 926.997467 MHz.
Connect the DC Voltmeter to the Discriminator test point. Adjust L603 to
indicate DC 0.85 V.
Connect the RF Signal Generator to the RF test point on the handset MAIN
PCB. Make sure that the frequency is 926.997467 MHz.
Connect the AC Voltmeter across a 150-ohm dummy to the MIC Connector.
Adjust RT602 for a 80 mV reading on the AC Voltmeter.
Press the 5 key to enter the TEST Mode 5. Make sure that the frequency
of RF SG output is 926.997467 MHz. Adjust RT601 to turn to the point
where the Ringer just beeps.
Adjustment
L603
(Discriminator
Voltage)
RT602
(RX AF
Voltage)
RT601
(SQ Point)
L603
RT601
RF PCB
RT602
J603
RF Test Point
Handset PCB
Discriminator Test Point
Содержание FT-8981
Страница 1: ...SERVICE MANUAL PUBLISHED IN JAPAN May 2001 FILE NO 2B0 200104 FT 8981 CORDLESS TELEPHONE ...
Страница 9: ... 8 BLOCK DIAGRAMS Base Unit ...
Страница 10: ... 9 Handset ...
Страница 11: ...SCHEMATIC DIAGRAMS Base Unit 10 11 FT8981 Sche p65 01 05 25 13 21 Page 8 Adobe PageMaker 6 5J Win ...
Страница 12: ...Handset 12 13 FT8981 Sche p65 01 05 25 13 21 Page 9 Adobe PageMaker 6 5J Win ...
Страница 27: ... 28 ELECTRICAL PARTS LOCATION Base Unit Main PCB ...
Страница 28: ... 29 Handset Main PCB ...
Страница 29: ... 30 WIRING DIAGRAMS Base Unit ...
Страница 30: ... 31 Handset ...