Toshiba FT-8800, Руководство по обслуживанию

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6
L603
RT601
RF PCB
RT602
J603
Receiver Section
Connections
Alignment Point Location on Handset Main PCB and Handset RF PCB
Preset
a) Connect the handset RF unit to the handset main unit.
b) Connect DC power supply to battery connector on the handset unit.
c) Turn the DC power supply ON while pressing “
*
” and “ # ” keys, and keep pressing the keys continuously for
approximate 2 seconds.
d) Release keys when entering TEST mode 1 with beep.
Alignment Procedure
step
1
2
3
Preset to
SG: 1mV
No modulation
SG: 1mV
1 kHz ±8kHz
deviation
SG: -6.0 dB
µµµµµ
V
1kHz ±8kHz
Deviation
Remarks
Press the “4” key to enter the TEST Mode 4. 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 100 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)
RF Test Point
Handset PCB
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
-
+
-
Discriminator Test Point