Tait TM9100 Service Manual

318 Transmitter Fault Finding (25W Radios) TM9100 Service Manual
© Tait Electronics Limited August 2005
12.1 Power Supplies
Introduction First check that a power supply is not the cause of the fault. There are two
power supplies and a switch circuit for the transmitter:
■ Task 1: 13.8V DC supply from power connector (+13V8 BATT)
■ Task 2: switch circuit for 13.8V DC supply
■ Task 3: 9V DC supply from 9V regulator in PSU module (+9V0 TX)
The measurement and test points for diagnosing faults in the power supplies
are summarized in Figure 12.1.
Figure 12.1 Measurement and test points for diagnosing faults involving the power supplies for
the transmitter
GND
TEST POINT
GND
TEST POINT
9V0 TX
TEST POINT
9V0 TX
TEST POINT
SIGNAL TYPES
RF
ANALOG
EXCITER
PA s
FRE-
QUENCY
SYNTHE-
SIZER
OTHER
TRANS-
MITTER
CIRCUITRY
TRANSMITTER
INTERFACE
CIRCUITRY
DRIVER
+13.8 V DC SUPPLY
TO PA DRIVER
+13.8 V DC SUPPLY
TO PA DRIVER
+13.8 V DC
SUPPLY TO PAs
+13.8 V DC
SUPPLY TO PAs
L310
POWER
SUPPLY
AGND
+9V0 TX
+13V8 BATT
SWITCH
L306

Tait TM9100 Specifications

General

Brand	Tait
Model	TM9100
Category	Radio
Language	English