Toshiba FT-7800A Service Manual page 6

Handset Unit
Transmitter Section
Connections
Frequency
Counter
Deviation
Preset
a) Connect DC power supply to battery connector on the handset unit.
b) Turn the DC power supply ON while pressing " " and "#" keys, and keep pressing the keys continuously for
approximate 2 seconds.
c) Release keys when entering TEST mode 1 with TALK LED lighting and beep.
Alignment Procedure
Step Adjustment
RT604
1
(TX Power)
CT601
2
(TX Frequency)
RT603
3
(TX Modulation)
Alignment Point Location on Handset Main PCB and Handset RF PCB
RF
Test Point
Power
Meter
RF
Test Point
Meter
Connect the RF power Meter to the RF test point on the handset MAIN PCB.
Adjust RT604 for a −5.0 dBm reading on the Power Meter.
Connect the Frequency Counter to the RF test point on the handset MAIN
PCB. Adjust CT 601 to make sure that the frequency is 903.636249 MHz.
Press the "2" key to enter the TEST Mode 2. Connect the AF Generator to
the MIC Connector. Make sure that the output is 1 kHz 9 mV from the AF
Generator.
Connect the Deviation Meter to the RF test point on the handset MAIN PCB.
Adjust RT603 to indicate ±20kHz Dev.
CT601
HANDSET Unit
J601
Battery 1kHz 9mV
MIC + Pin
Connector
DC 3.8V
Remarks
RT603
RF PCB
— 5 —
AF GEN.
DC Power Supply
RT604
RF
TEST POINT