8
Receiver Section
Connections
Alignment Point Location on Handset Main PCB and Handset RF PCB
Preset
Place the Handset in RX SENS mode (step 4) in accordance with the procedure on page 4.
Alignment Procedure
step
1
2
3
Preset to
SG: 1mV
No modulation
SG: 1mV
1 kHz ±8kHz
deviation
SG: -6.0 dB
µµµµµ
V
1kHz ±8kHz
Deviation
Remarks
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 L402 to indicate
DC 1.00 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 SP Connector.
Adjust RT402 for a 128 mV (Medium) 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 RT401 to turn to the point
where the indication is just vibrated.
Adjustment
L402
(Discriminator
Voltage)
RT402
(RX AF
Voltage)
RT401
(SQ Point)
RF PCB
RF Test Point
L402
RT402
J401
RT401
AF Test Point
Handset PCB
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
-
+
-
(-)
(+)
SP Terminal
Summary of Contents for FT-8939
Page 2: ...CORDLESS TELEPHONE SERVICE MANUAL FILE NO 2B0 9904 FT 8939 PUBLISHED IN JAPAN Sep 1999 ...
Page 11: ...9 BLOCK DIAGRAMS Base Unit Main ...
Page 12: ...10 Base Unit DSP ...
Page 13: ...11 Handset ...
Page 14: ...12 13 SCHEMATIC DIAGRAMS Base Unit Main ...
Page 15: ...14 15 Base Unit Key ...
Page 16: ...16 17 Handset ...
Page 33: ...34 ELECTRICAL PARTS LOCATION Base Unit Main PCB ...
Page 34: ...35 Base Unit Key PCB ...
Page 35: ...36 Handset Main PCB ...
Page 36: ...37 38 WIRING DIAGRAMS Base Unit ...
Page 37: ...39 Handset ...
Page 40: ...42 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 62: ......