Tait TM8100 mobiles - Page 291

TM8100/TM8200 Service Manual Transmitter Fault Finding (>25W) 291
© Tait Electronics Limited November 2007
Figure 11.8 Measurement and test points for diagnosing faults in the biasing of the PAs and PA
driver
PIN
SWITCH
AND LPF
REV PWR FWD PWR
R336R347
DIREC-
TIONAL
COUPLER
PA s
BUFFER AMPLIFIER BUFFER AMPLIFIER
POWER CONTROL
DRIVER
EXCITER
BIAS
LIMITER
SHAPER
AND
LEVEL
SHIFTER
SHAPER
AND
LEVEL
SHIFTER
SHAPING
FILTER
FRE-
QUENCY
SYNTHE-
SIZER
CDC TX DRV BIAS CDC TX FIN BIAS1 CDC TX FIN BIAS2 CDC TX PWR CTL TX FWD PWR TX REV PWR
CODEC
AND AUDIO
CIRCUITRY
SIGNAL TYPES
RF ANALOG
SET PWR
TEST POINT
SET PWR
TEST POINT
DRV
TEST POINT
DRV
TEST POINT
PIN 8 OF
IC303
PIN 8 OF
IC303
PIN 9 OF
IC303
PIN 9 OF
IC303
PIN 10 OF
IC303
PIN 10 OF
IC303
PIN 5 OF
IC303
PIN 5 OF
IC303
PIN 3 OF
IC303
PIN 3 OF
IC303
FIN1
TEST POINT
FIN1
TEST POINT
FIN2
TEST POINT
FIN2
TEST POINT
PWR
TEST POINT
PWR
TEST POINT
PIN 14 OF
IC301
PIN 14 OF
IC301
PIN 8 OF
IC301
PIN 8 OF
IC301
PIN 1 OF
IC301
PIN 1 OF
IC301
GATES OF
Q309, Q310
GATES OF
Q309, Q310
GATE OF
Q306
GATE OF
Q306
R396
(K5 band only)