Toshiba FT-8859, Service Manual

Page: 10 / 57

8
Receiver Section
Connection
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
Alignment Point Location on Handset Main PCB and Handset RF PCB
step Preset to Adjustment Remarks
1
SG: 1mV
No modulation
L603
(Discriminator
Voltage)
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.
2
SG: 1mV
1kHz ±8kHz
deviation
RT602
(RX AF
Voltage)
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 44.7 mV reading on the AC Voltmeter.
3
SG: -6.0 dB
µ
V
1kHz ±8kHz
Deviation
RT601
(SQ Point)
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.
RF
Test Point
HANDSET Unit
RF SG
DC Power Supply
DC 3.8V
Dummy Load
(150-ohm)
AC Voltmeter
DC Voltmeter
AF
Terminal J603
Battery
Connector
SP
Connector
-
+
-
+
Handset PCB
RF Test Point
L603
J603
RF PCB RT601
RT602
Discriminator Test Point