Tait TB8100 Service Manual page 154

Table 8.1 Test point voltages on the control board
Test
Point Pin Pin Name
SK101 1 & 4 GND
2 & 3 +28V-FILT-CONTROL
SK102 1 POWER-CONTROL
2 RF-DET
3 PA-KEY-COAX
4 DRIVER-TEMP
SK103 1 STANDBY
2 DRIVER-CURRENT-MICRO <0.05V
3 DRIVER-BIAS-MICRO
4 +10V-SWITCHED
SK104 1 FINALX-CURRENT-
SK105 MICRO
SK106
2 FINALX-BIAS-MICRO
SK107
3 FINALX-TEMP
4 GND
SK108 1 FWD-PWR-DC
2 REV-PWR-DC
3 +10V-LPF
4 GND
TP100 +5V-DIG
TP102 +10V
TP103 –3V
TP204 POWER-LEVEL
TP206 scaled voltage supply
TP211 KEY-CONT
a. Measured when the PA is set to its rated RF output power (i.e. 5W, 50W, or 100W according to model).
b. X = final 1 or final 2.
154 Power Amplifier Fault Finding
Tx Off
Voltage
26V to 30V
<0.5V
>6.0V
>4.0V
digital
<0.5V
<0.05V
0.05V
<0.05V
b
b
<0.05V
b
digital
0.27V
0.27V
10V
5V
10V
–3V
<0.05V
1.96V typical
<0.05V
Tx On
a
Voltage Notes
ground
26V to 30V filtered supply
1.5V to 6V analogue voltage
<0.8V RF drive present, +11dBm
<0.5V logic level
digital digital signal, 0V and 5V
<0.5V logic level
>0.5V <1.1V current =
measured voltage ÷ 2
3.37V typical analogue voltage
10V 10V regulated supply to
6W board
2V typical current =
measured voltage × 2
4V typical typical analogue voltage
digital digital signal, 0V and 5V
signal ground
2.5V Analogue, proportional to
forward power
<0.6V Analogue, proportional to
reverse power
10V 10V regulated
ground
5V regulated supply
10V regulated supply
–3V regulated supply
>0V <4.5V analogue, will vary with set
power
1.96V typical analogue, 1.5V to 2.45V
>4V digital
© Tait Electronics Limited September 2006
TB8100 Service Manual