Tait T2000 II Series Service Manual page 109

M2000-00
T2000-200/ -300/ -400/ -500/ -600/ -700
Is RF voltage at
driver base
≥ ≥ ≥ ≥
T2000-200 1.0V?
≥ ≥ ≥ ≥
T2000-300 3.0V?
≥ ≥ ≥ ≥
T2000-400 2.2V?
T2000-500/ -600/ -700
≥ ≥ ≥ ≥
8.0V?
Y
Is RF voltage at
driver collector ...
≥ ≥ ≥ ≥
T2000-200 17V?
≥ ≥ ≥ ≥
T2000-300 22V?
≥ ≥ ≥ ≥
T2000-400 25V?
T2000-500/ -600/ -700
Do not measure.
Y
Is RF voltage at
final base ...
≥ ≥ ≥ ≥
T2000-200 2.0V?
≥ ≥ ≥ ≥
T2000-300 2.0V?
≥ ≥ ≥ ≥
T2000-400 4.7V?
T2000-500/ -600/ -700
≥ ≥ ≥ ≥
20V?
Y
Is RF power into
50 Ohm dump load at
junction between
collector matching &
≥ ≥ ≥ ≥
PIN switch 40W?
Note exact power level.
Y
Is DC feed voltage
for PIN switch
1.5-2V on transmit?
Y
Is power output
approx. 30-35W?
Y
Copyright TEL
Continued
N
Check interstage
components
N Is driver collector
voltage 13-14VDC
approx.?
N
Check interstage
components
Replace Module
Is final collector
N
voltage 13-14V?
Check collector
matching components.
N Check feed
components to PIN
switch diode
Check components
N in low pass filter.
filter loss <1dB
approx.?
i.e. 40-32W
Success
Fault Finding
T2000-800
N Is R.F. Voltage at
module input
DC Voltages correct
on module pins?
N
Pin 2:
Pin 3:
Pin 4:
(Pin 1 is I/P, Pin2 is O/P)
Is RF power into
N 50 Ohm dump load
on module output
Note exact power level.
N Is DC feed voltage
for PIN switch
1.5-2V on transmit?
N
Is power output
approx. 25-20W?
5.29
0.7V?
Y
≥ ≥ ≥ ≥
12.7V
≥ ≥ ≥ ≥
13.5V
≥ ≥ ≥ ≥
13.2V
Y
≥ ≥ ≥ ≥
25W?
Y
Y
Y
31/10/96