Toshiba FT-8981A Service Manual page 8

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Receiver Section
Connections
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 beep.
Alignment Procedure
Step
Preset to
Adjustment
SG: 1mV
1
(Discriminator
No modulation
SG: 1mV
1 kHz ±8kHz
2
Deviation
SG: -6.0 dBµV
1kHz ±8kHz
3
(SQ Point)
Deviation
Alignment Point Location on Handset Main PCB
HAND Main PCB
J601
HANDSET Unit
RF SG
RF
-
Test Point
+
DC Power Supply
J601
Battery
Connector
DC 3.8V
Press the "4" key to enter the TEST Mode 4. Connect the RF Signal
L615
Generator to the RF test point on the handset MAIN PCB. Make sure that
the frequency is 926.997467 MHz.
Voltage)
Connect the DC Voltmeter to the Discriminator test point. Adjust L615 to
indicate DC 0.85 V.
Connect the RF Signal Generator to the RF test point on the handset MAIN
RT604
PCB. Make sure that the frequency is 926.997467 MHz.
(RX AF
Connect the AC Voltmeter across a 150-ohm dummy to the MIC Connector.
Voltage)
Adjust RT604 for a -18.0 dBV reading on the AC Voltmeter.
Press the "5" key to enter the TEST Mode 5. Make sure that the frequency
RT603
of RF SG output is 926.997467 MHz. Adjust RT603 to turn to the point
where the Ringer just beeps.
Discriminator Test Point
RT604
Dummy Load
(150-ohm)
SP
-
Connector
+
DC Voltmeter
AF
Terminal
Remarks
RT603
L615
— 7 —
AC Voltmeter
RF Test Point

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