351804-1 Rev. 100
COM5000-8 TECHNICAL MANUAL
46
Measure resistance between:
Verify values:
Adjust:
U29 pin 3 and GND
2.2
– 2.4 K ohm
VR6 for 2300 Ohm
U29 pin 5 and GND
2.2
– 2.4 K ohm
VR7 for 2300 Ohm
U30 pin 1 and 2
2.6
– 2.8 K ohm
VR8 for 2700 Ohm
U30 pin 6 and 7
1.7
– 1.9 K ohm
VR9 for 1800 Ohm
U41 pin 1 and 2
1.6
– 1.8 K ohm
VR4 for 1700 Ohm
U41 pin 6 and 7
1.6
– 1.8 K ohm
VR3 for 1700 Ohm
U41 pin 10 and GND
4.3 - 4.7 K ohm
VR5 for 4500 Ohm
U41 pin 12 and GND
1.5
– 1.7 K ohm
VR2 for 1600 Ohm
To perform operational adjustment of the System Controller Module it is necessary to operate the
Transmitter as follows:
The System Controller Module is pulled out of the Transmitter rack cabinet to gain access to
subassemblies.
All Control connections and the RF drive signal connection from the T-4180 are in place to permit
normal operation of the Transmitter.
The Transmitter is terminated in a 50 Ohm Load/Attenuator with a wattmeter inserted between the
RF output connector and the load.
A variable attenuator (0.1 dB resolution) is inserted in the RF drive input connection between the
T-4180 and the System Controller.
