Toshiba FT-8989, Service Manual

Page: 10 / 66

8
Receiver Section
Connections
Alignment Point Location on Handset Main PCB and Handset RF PCB
Preset
Place the Handset in RX SENS mode (step 4) in accordance with the procedure on page 4.
Alignment Procedure
step
1
2
3
Preset to
SG: 1mV
No modulation
SG: 1mV
1 kHz ±8kHz
deviation
SG: -6.0 dB
µµµµµ
V
No moduration
Remarks
Connect the RF Singal Generator to the RF test point on the handset MAIN
PCB. Make sure that the frequency is 926.997467 MHz.
Connect the DC Voltmeter to the Discriminator test point. Adjust L603 to
indicate DC 0.85 V.
Connect the RF Signal Generator to the RF test point on the handset MAIN
PCB. Make sure that the frequency is 926.997467 MHz.
Connect the AC Voltmeter across a 150-ohm dummy to the MIC Connector.
Adjust RT602 for a 35 mV reading on the AC Voltmeter.
Press the “5” key to enter the TEST Mode 5. Make sure that the frequency
of RF SG output is 926.997467 MHz. Adjust RT601 to turn to the point
where the Ringer just beeps.
Adjustment
L603
(Discriminator
Voltage)
RT602
(RX AF
Voltage)
RT601
(SQ Point)
AC Voltmeter HANDSET Unit
AF
Terminal
Dummy Load
(150-ohm)
RF SG
DC 3.8V
J603
Battery
Connector
+
RF
Test Point SP
Connector
DC Power Supply
DC Voltmeter
-
+
-
RF PCB
RF Test Point
L603
RT602
J603
Handset PCB
RT601
Discriminator Test Point