Tait TM9100 - Page 325

TM9100 Service Manual Transmitter Fault Finding (25W Radios) 325
© Tait Electronics Limited August 2005
Figure 12.5 Measurement and test points for diagnosing faults concerning the transmitter
RF power
REV PWR
TEST POINT
REV PWR
TEST POINT
FWD PWR
TEST POINT
FWD PWR
TEST POINT
LEAD TO
TEST SET
LEAD TO
TEST SET
TX INH
TEST POINT
TX INH
TEST POINT
50 TEST LEAD
TO TEST SET
Ω
50 TEST LEAD
TO TEST SET
Ω
D TX INH
TEST POINT
D TX INH
TEST POINT
RF CON-
NECTOR
RECEIVER
LPF
DIREC-
TIONAL
COUPLER
PA s
BUFFER AMPLIFIER BUFFER AMPLIFIER
POWER CONTROL
PIN SWITCH
DRIVER EXCITER
BIAS
LIMITER
SHAPER
AND
LEVEL
SHIFTER
SHAPER
AND
LEVEL
SHIFTER
SHAPING
FILTER
DIGITAL
BOARD
OR GATE
DIG TX INH DIG SYN EN SYN LOCK
SYN TX LO
FRE-
QUENCY
SYNTHE-
SIZER
TX FWD PWR TX REV PWR
CODEC
AND AUDIO
CIRCUITRY
SIGNAL TYPES
RF ANALOG CLOCK DIGITAL
CDC TX DRV BIAS CDC TX FIN BIAS1 CDC TX FIN BIAS2 CDC TX PWR CTL
AND