— 4 —
RECEIVER
Test Equipment Required and Connections
•
SG: RF Signal Generator, 49.830 MHz, 49.160 MHz
•
Dummy Load, 600-ohm
•
Digital Voltmeter
•
AF SSVM
•
SINAD Meter
Alignment Procedure
Step
Preset to
Adjustment
Remarks
1
SG: 1 mV
No modulation
L7
Connect the SG to the RF test point.
Connect the digital voltmeter to the test point of the RX VCO.
Adjust L7 to indicate DC 1.4
±
0.05 V.
2
SG: 1 mV
1 kHz
±
3kHz
deviation
L3
Connect the digital voltmeter to the test point of Discriminator.
Adjust L3 to indicate DC 2.0
±
0.05V.
3
SG: 1 mV
1 kHz
±
3 kHz
deviation
RT1
Adjust RT1 to make AF SSVM value
−
5 dBm
±
0.5 dB.
4
SG: 1 mV
1 kHz
±
3 kHz
deviation
L6
Set T/P SW to TONE Mode. Press the Page key once, then CH
changes to CH 8.
Connect the AF SSVM to the TEL LINE across a 600-ohm dummy
load.
Keep the SINAD reading at 12 dB by adjusting the SG output. Adjust
L6 for maximum SINAD reading.
Preset
a) Set T/P SW to Pulse Mode.
b) Turn on AC power while the Page key is being depressed.
c) Release the Page key about 2 seconds later, then the TX Mode is entered (CH21).
d) Press the Page key 4 times, then the RX Mode is entered (CH21).
Alignment Point Location on Main (Base Unit) PCB
-
+
SG
Base Unit
AF SSVM
Digital Voltmeter
SINAD
Meter
MOD = 1KHz
DEV = ±3kHz
AC Adapter
(120V 60HZ)
Dummy Load
(600-ohm)
RX VCO
Test Point
RF Test
Point
TEL Jack
RT1
L3
L7 L6
RX VCO
Test Point
Discriminator
Test Point
DC IN 9V Jack
T/P SW
J2
S1
RF Test Point
L1
P
T
Содержание FT-7807R
Страница 1: ...CORDLESS TELEPHONE SERVICE MANUAL PUBLISHED IN JAPAN Jun 1998 FT 7807R FILE NO 2B0 9803 ...
Страница 8: ... 7 ...
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Страница 10: ... 9 10 SCHEMATIC DIAGRAMS TEST POINT RF TEST POINT RX VCO TEST POINT TX VCO TEST POINT Discriminator ...
Страница 11: ... 11 12 TEST POINT RF TEST POINT RX VCO TEST POINT Discriminator TEST POINT TX VCO ...
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Страница 29: ... 30 EXPLODED VIEW AND MECHANICAL PARTS LIST Base Unit ...
Страница 31: ... 32 Handset ...
Страница 52: ...MECHANICAL PARTS LIST ...