Toshiba FT-7807R, Руководство по обслуживанию

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ALIGNMENT PROCEDURE
BASE UNIT / TRANSMITTER
Test Equipment Required and Connections
•
Oscilloscope
•
Dummy Load, 50-ohm
•
Frequency Counter
•
AC Power Supply: 120V, 60Hz (With AC Adapter)
•
Digital Voltmeter
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).
Alignment Procedure
Step Adjustment Remarks
1 L10
Connect the oscilloscope across a 50-ohm load to RF test point.
Set the digital voltmeter at the test point of TX VCO.
Adjust L10 to indicate DC 2.8
±
0.05 V (VCO).
2

Connect the frequency counter across a 50-ohm dummy load to RF test
point. Make sure that the frequency is 46.770 MHz
±
1500 Hz.
Alignment Point Location on Main (Base Unit) PCB
−
+
AC Adapter
(120V 60Hz)
Base Unit
J2
DC IN 9V
JACK
RF Test
Point
Dummy Load
(50-ohm)
Frequency Counter
Oscilloscope Digital Voltmeter
TX VCO
Test Point
TX VCO Test Point
DC IN 9V Jack
T/P SW
P
T
J2
S1
L10
RF Test Point
L1