Base Unit - Toshiba FT-8908 Service Manual

Base Unit

Transmitter Section
Connection
Power
Meter
Frequency
Counter
Deviation
Meter
Preset
Place the Base Unit in VCO/TX FREQ ADJ mode in accordance with the procedure on page 3.
Alignment Procedure
Step Adjustment
VR202
1
(TX Power)
CT201
2
(TX Frequency)
RT2
3
(TX Modulation)
Alignment Point Location on Base Main PCB and Base RF PCB
RF
BASE RF PCB
Test Point
RF
Test Point
RF
Test Point
Connect the Power Meter to the RF test point on the Base RF PCB. Adjust
VR202 for a −6.5 dBm reading on the Power Meter.
Connect the Frequency Counter to the RF test point on the Base RF PCB.
Adjust CT201 to make sure that the frequency is 926.893873 MHz.
Press the "PAGE" key to enter the TEST Mode 2. Connect the AF
Generator to the TEL Line Jack on the Base Main PCB. Make sure that the
output is 1 kHz 77.5 mV from the AF Generator.
Connect the Deviation Meter to the RF test point on the Base RF PCB.
Adjust RT2 to indicate ±8 kHz Dev.
Base Main PCB
RT2
— 5 —
BASE MAIN PCB
J3 J1
DC IN TEL Line 1kHz 77.5mV
9V Jack Jack
DC 9V
Remarks
Base RF PCB
J201
CT201 VR202
AF GEN.
AC
AC 120V
Adapter
60Hz
J1
TEL LINE Jack
J3
DC IN 9V Jack
T
S1
T/P Switch
P
RF TEST POINT