— 8 —
Receiver Section
Connection
Alignment Procedure
Step
Preset to
Adjustment
Remarks
1
SG: 1 mV
No modulation
L512
(Discriminator
Voltage)
Connect the RF Signal Generator to the RF test point on the handset RF
PCB. Make sure that the frequency is 927.000602 MHz.
Connect the DC Voltmeter to the J601 AF test point. Adjust L512 to
indicate DC 0.95 V.
2
SG: 1 mV
1 kHz
±
8 kHz
deviation
VR602
(RX AF
Output)
Connect the RF Signal Generator to the RF test point on the handset RF
PCB. Make sure that the frequency is 927.000602 MHz.
Connect the AC Voltmeter across a 150-ohm dummy to the SP
Connector. Adjust VR602 for a 60 mV reading on the AC Voltmeter.
3
SG:
−
7 dB
µ
V
1 kHz
±
8 kHz
deviation
VR501
(SQ Point)
Press the “5” key to enter the TEST Mode 5. Make sure that the
frequency of RF SG output is 927.000602 MHz. Adjust VR501 to turn to
the point where the LINE 1 LED just turns on.
Alignment Point Location on Handset Main PCB and Handset RF PCB
RF SG
−
+
RF
Test Point
HANDSET RF PCB
J602
SP
Connector
HANDSET MAIN PCB
−
+
Dummy Load
(150-ohm)
AC Voltmeter
J601
AF Terminal
DC Voltmeter
Battery
Terminals
DC Power Supply
DC 3.8V
Preset
Place the Handset in RX SENS mode (step 4) in accordance with the procedure on page 4.
J501
Handset Main PCB
RF TEST POINT
Battery Terminals
−
+
VR501
VR602
J602
SP
Connector
AF TEST POINT
RF PCB
J601
L512
Содержание FT-8258
Страница 1: ...SERVICE MANUAL PUBLISHED IN JAPAN Jun 1998 FILE NO 2B0 9801 FT 8258 CORDLESS TELEPHONE ...
Страница 10: ...BLOCK DIAGRAMS Handset Main 9 ...
Страница 11: ...Handset RF 10 ...
Страница 12: ...Base RF 11 ...
Страница 13: ...Base Main 12 13 ...
Страница 14: ... 14 15 SCHEMATIC DIAGRAMS ...
Страница 15: ... 16 17 Base RF ...
Страница 16: ...Base Key 18 19 ...
Страница 17: ... 20 21 Handset Main ...
Страница 18: ... 22 23 Handset RF ...
Страница 37: ...ELECTRICAL PARTS LOCATIONS Base Main 42 ...
Страница 38: ...Base RF 43 ...
Страница 39: ...Base Key 44 ...
Страница 40: ...Handset Main 45 ...
Страница 41: ...Handset RF 46 ...
Страница 42: ...WIRING DIAGRAMS Base 47 ...
Страница 43: ...Handset 48 ...
Страница 75: ...MECHANICAL PARTS LIST ...