Toshiba FT-8800, Service Manual

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4
Receiver Section
Connections
Alignment Point Location on Base Main PCB and Base RF PCB
Preset
a) Connect the base RF unit to the base main unit.
b) Set the “TONE/PULSE” switch to PULSE.
c) Connect the AC adapter to the base unit while pressing the “PAGE” key, and keep pressing it continuously for
approximate 2 seconds.
d) Release the “PAGE” key when entering TEST mode 1 with IN USE LED lighting.
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 “PAGE” key for 3 times to enter the TEST Mode 4. Connect the
RF Signal Generator to the RF test point on the Base MAIN PCB. Make
sure that the frequency is 902.952467 MHz.
Connect the DC Voltmeter to the Discriminator test point. Adjust L3 to
indicate DC 0.95 V.
Connect the AC Voltmeter across a 600-ohm dummy to the Telephone Line
Jack. Adjust RT2 for a -11dBm reading on the AC voltmeter.
Press the “PAGE” key to enter the TEST Mode 5. Make sure that the
frequency of RF SG output is 902.952467 MHz. Adjust RT1 to turn to the
point where the CHG LED just turns on.
Adjustment
L3
(Discriminator
Voltage)
RT2
(RX AF
Voltage)
RT1
(SQ Point)
Base Main PCB
AC Voltmeter BASE Unit
AF
Terminal
Dummy Load
(600-ohm)
RF SG
AC 120V
60Hz
J2
DC IN 9V Jack
+
RF
Test Point
J1
TEL Line
Jack
AC
Adapter
DC Voltmeter
-
+
-
RT1
RT2
J1
TEL LINE Jack
J2
DC IN 9V Jack
S2
TONE/PULSE Switch
T
P
L3
RF Test Point Discriminator Test Point