6
Receiver Section
Connections
Alignment Point Location on Handset Main PCB and Handset RF PCB
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 1 second.
d) Release keys when entering TEST mode 1 with TALK LED and LINE2 LED lighting and beep.
Alignment Procedure
step
1
2
3
Preset to
SG: 1mV
No modulation
SG: 1mV
1 kHz ±8kHz
deviation
SG: -7.0 dB
µµµµµ
V
1kHz ±8kHz
Deviation
Remarks
Press the “4” key to enter the TEST Mode 4. Connect the RF Singal
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 AF test point. Adjust L603 to indicate
DC 0.85V.
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 SP Connector.
Adjust RT602 for a 150 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 LINE1 LED just turns on.
Adjustment
L603
(Discriminator
Voltage)
RT602
(RX AF
Voltage)
RT601
(SQ Point)
AC Voltmeter
HANDSET Unit
AF
Test Point
Dummy Load
(150-ohm)
RF SG
DC 3.8V
J603
Battery
Connector
+
RF
Test Point
SP
Terminal
DC Power Supply
DC Voltmeter
-
+
-
RF PCB
RF Test Point
AF Test Point
Handset PCB
Summary of Contents for FT-8259
Page 1: ...CORDLESS TELEPHONE PUBLISHED IN JAPAN Sep 1999 SERVICE MANUAL FILE NO 2B0 9906 FT 8259 ...
Page 8: ...7 BLOCK DIAGRAMS Base Unit ...
Page 9: ...8 Handset ...
Page 10: ...9 10 SCHEMATIC DIAGRAMS Base Unit Main ...
Page 11: ...11 Base Unit Key ...
Page 12: ...12 13 Handset ...
Page 31: ...32 ELECTRICAL PARTS LOCATION Base Unit Main PCB ...
Page 32: ...33 Base Unit Key PCB ...
Page 33: ...34 Handset Main PCB ...
Page 34: ...35 36 WIRING DIAGRAMS Base Unit ...
Page 35: ...37 Handset ...
Page 38: ...40 Handset 7 8 4 1 16 17 17 5 10 15 11 12 2 9 6 13 14 3 17 MAIN PCB ASSY RF MODULE HANDSET ...
Page 60: ......