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— 7 —
Preset
a) Connect DC power supply to battery connector on the handset unit.
b) Turn the DC power supply ON while pressing “
∗
” and “ # ” keys, and keep pressing the keys continuously for
approximate 2 seconds.
c) Release keys when entering TEST mode 1 with TALK LED lighting and beep.
Alignment Point Location on Handset Main PCB
AC Voltmeter
HANDSET Unit
AF
Test Point
Dummy Load
(150-ohm)
RF SG
DC 3.8V
J601
Battery
Connector
BLK
RF
Test Point
SP
Terminal
DC Power Supply
DC Voltmeter
WHT
+
-
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 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 Terminal of RT603. Adjust L615 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 SP Terminal.
Press the 5 key to enter the TEST Mode 5. Make sure that the frequency
of RF SG output is 926.997467 MHz. Adjust RT603 to turn to the point
where the indication is just vibrated.
Adjustment
L615
(Discriminator
Voltage)
RT604
(RX AF
Voltage)
RT603
(SQ Point)
Adjust RT604 for a -19.0 dBV reading on the AC Voltmeter.
HAND Main PCB
J601
RF Test Point
AF Test Point
L615
RT604
RT603
Содержание FT-8901A
Страница 1: ...SERVICE MANUAL PUBLISHED IN JAPAN Oct 2001 FILE NO 2BO 200113 FT 8901A CORDLESS TELEPHONE ...
Страница 9: ...BLOCK DIAGRAMS Base Unit 8 ...
Страница 10: ... 9 Handset Unit ...
Страница 11: ...RF Section SCHEMATIC DIAGRAMS Base Unit 10 11 FT8901A Sche p65 01 10 15 10 42 Page 8 Adobe PageMaker 6 5J Win ...
Страница 12: ...Base Key Unit 12 13 FT8901A Sche p65 01 10 15 10 42 Page 9 Adobe PageMaker 6 5J Win ...
Страница 13: ...Handset Unit 14 15 RF Section FT8901A Sche p65 01 10 15 10 42 Page 10 Adobe PageMaker 6 5J Win ...
Страница 26: ... 28 Unit V Ref No Pin STBY TALK Note Note 61 2 9 2 9 IC608 62 2 9 2 9 63 2 9 2 9 64 2 9 2 9 ...
Страница 29: ... 31 ELECTRICAL PARTS LOCATION Base Unit Main PCB ...
Страница 30: ... 32 Base Unit Key PCB ...
Страница 31: ... 33 Handset Unit Main PCB ...
Страница 32: ... 34 WIRING DIAGRAMS Base Unit ...
Страница 33: ... 35 Handset Unit ...