Toshiba FT-8006A BK, Service Manual

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— 5 —
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 TALK LED lighting and beep.
Alignment Procedure
Step Preset to Adjustment Remarks
1
SG: 1 mV
No modulation
L512
(Discriminator
Voltage)
Press the “4” key to enter the TEST Mode 4. Connect the RF Signal
Generator to the RF test point on the handset RF PCB. Make sure that
the frequency is 926.994344 MHz.
Connect the DC Voltmeter to the J601 AF test point. Adjust L512 to
indicate DC 0.85 V.
2
SG: 1 mV
1 kHz
±
8 kHz
deviation
VR602
(RX AF
Output)
Connect the RF Signal Generator to the RF test point on the handset RF
PCB. Make sure that the frequency is 926.994344 MHz.
Connect the AC Voltmeter across a 150-ohm dummy to the MIC
Connector. Adjust VR602 for a 155 mV reading on the AC Voltmeter.
3
SG:
−
6.5 dB
µ
V
1 kHz
±
8 kHz
deviation
VR501
(SQ Point)
Press the “5” key to enter the TEST Mode 5. Make sure that the
frequency of RF SG output is 926.994344 MHz. Adjust VR501 to turn to
the point where the indication is just vibrated.
Alignment Point Location on Handset Main PCB and Handset RF PCB
RF SG
−
+
RF
Test Point
HANDSET RF PCB
J602
SP
Connector
HANDSET MAIN PCB
−
+
Dummy Load
(150-ohm)
AC Voltmeter
J1
AF Terminal
DC Voltmeter
J603
Battery
Connector
DC Power Supply
DC 3.8V
Handset Main PCB RF PCB
AF TEST POINT
RF TEST POINT
J603
Battery
Connector
VR602
J502
VR501
L512
J602
SP
Connector
J501