— 6 —
Receiver Section
Connection
Alignment Point Location on Base Main PCB and Base RF PCB
Preset
Place the Base Unit in RX SENS mode (step 4) in accordance with the procedure on page 3.
Alignment Procedure
Step
Preset to
Adjustment
Remarks
1
SG: 1mV
No modulation
L212
(Discriminator
Voltage)
Connect the RF Signal Generator to the RF test point on the Base RF
PCB. Make sure that the frequency is 902.984676 MHz.
Connect the DC Voltmeter to the J1 AF test point. Adjust L212 to indicate
DC 0.95 V.
2
SG: 1 mV
1 kHz
±
8kHz
deviation
RT1
(RX AF
Voltage)
Connect the RF Signal Generator to the RF test point on the Base RF
PCB. Make sure that the frequency is 902.984676 MHz.
Connect the AC Voltmeter across a 600-ohm dummy to the Telephone
Line Jack. Adjust RT1 for a 218 mV reading on the AC voltmeter.
3
SG:
−
7 dB
µ
V
No modulation
VR201
(SQ Point)
Press the “5” key to enter the TEST Mode 5. Make sure that the
frequency of RF SG output is 902.984676 MHz. Adjust VR201 to turn to
the point where the bell rings.
RF SG
−
+
RF
Test Point
BASE RF PCB
J6
TEL Line
Jack
BASE MAIN PCB
AC
Adapter
AC 120V
60Hz
−
+
Dummy Load
(600-ohm)
AC Voltmeter
J1
AF Terminal
DC Voltmeter
J2
DC IN
9V Jack
DC 9V
J6
TEL LINE Jack
J2
DC IN 9V Jack
Base Main PCB
RT1
J202
L212
VR201
AF TEST POINT
RF TEST POINT
J201
Base RF PCB
Содержание FT-8508
Страница 1: ...SERVICE MANUAL PUBLISHED IN JAPAN Jun 1998 FILE NO 2B0 9804 FT 8508 CORDLESS TELEPHONE ...
Страница 3: ... 2 OPERATING CONTROLS BASE UNIT CONTROLS HANDSET CONTROLS RS YZ 1 2 ...
Страница 10: ...Handset Main 9 BLOCK DIAGRAMS ...
Страница 11: ...Handset RF 10 ...
Страница 12: ...Base RF 11 ...
Страница 13: ...Base Main 12 13 ...
Страница 14: ...SCHEMATIC DIAGRAMS Base Main 14 15 ...
Страница 15: ...Base RF 16 17 ...
Страница 16: ...Base Key 18 19 ...
Страница 17: ...Handset Main 20 21 ...
Страница 18: ...Handset RF 22 23 ...
Страница 36: ...Base Main 41 ELECTRICAL PARTS LOCATION ...
Страница 37: ...Base RF 42 ...
Страница 38: ...Base Key 43 ...
Страница 39: ...Handset Main 44 ...
Страница 40: ...Handset RF 45 ...
Страница 41: ...Base 46 WIRING DIAGRAMS ...
Страница 42: ...Handset 47 W501 W 072147 J502 JK 736 9P J601 IC603 PORTABLE RF B501 PE1294DA TOP VIEW SOLDERING ...
Страница 71: ...MECHANICAL PARTS LIST ...