Tait TB7100, Руководство по обслуживанию

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298 Transmitter Fault Finding (50W/40W) TB7100 Service Manual
© Tait Electronics Limited October 2005
Figure 14.10 Measurement and test points for diagnosing faults in the biasing of the PAs and PA
driver
PIN
SWITCH
AND
LPF
REV
PWR
FWD
PWR
R336
R347
DIREC-
TIONAL
COUPLER
PA
s
BUFFER AMPLIFIER BUFFER AMPLIFIER
POWER CONTROL
DRIVER
EXCITER
BIAS
LIMITER
SHAPER
AND
LEVEL
SHIFTER
SHAPER
AND
LEVEL
SHIFTER
SHAPING
FIL
TER
FRE-
QUENCY SYNTHE-
SIZER
CDC
TX
DR
V
B
IAS
CDC
TX
FIN
B
IAS1
CDC
TX
FIN
B
IAS2
CDC
TX
PWR
CTL
TX
FWD
PWR
TX
REV
PWR
CODEC
AND
AUDIO
CIRCUITR
Y
SIGNA
L
TYPES
RF ANALOG
SET
PWR
TEST
POINT
SET
PWR
TEST
POINT
DR
V
TEST
POINT
DR
V
TEST
POINT
P
IN8O
F
IC303
PIN
8
OF
IC303
P
IN9O
F
IC303
PIN
9
OF
IC303
P
IN1
0O
F
IC303
PIN
10
OF
IC303
P
IN5O
F
IC303
PIN
5
OF
IC303
P
IN3O
F
IC303
PIN
3
OF
IC303
FIN1
TEST
POINT
FIN1
TEST
POINT
FIN2
TEST
POINT
FIN2
TEST
POINT
PWR
TEST
POINT
PWR
TEST
POINT
P
IN1
4O
F
IC301
PIN
14
OF
IC301
P
IN8O
F
IC301
PIN
8
OF
IC301
P
IN1O
F
IC301
PIN
1
OF
IC301
GA
TES
OF
Q309,
Q310
GA
TES
OF
Q309,
Q310
GA
TE
OF
Q306
GA
TE
OF
Q306
R396