Model 125W1000A
34
Rev A
4.
If the Interlock Fault will not clear, check for continuity in the External Interlock Circuit (Pin 1 to Pin 8 in
the connector, which mate with J3 in the rear panel).
5.
Check the voltage on A7 J5, pin 30; it should be < 0.01V.
6.
If the voltage on A7 J5, pin 30 is high, check the interlock line to ground.
4.3.5
Amplifier Faults (Diagram 10052988)
1.
The fault output of the A2 AMP Fault #1 and #2 modules is sensed on A7, J5, pins 9 and 10.
2.
Verify the correct voltages to the modules. Troubleshoot any incorrect voltages.
J5-8 = -8V
±
0.3 V
J5-4, J5-5 = +27 ± 0.2V
4.3.6
Low or No Power Output (DC Tests) (Diagram 10052988)
All indicators are normal, the front panel display reads
Power On
, and the cooling fans (B1, B2 and B3) are
operating.
1.
Check the position of the RF Gain control—is it set to maximum gain?
2.
Check the RF input to the unit—is it the correct amplitude and frequency?
3.
Check the RF output connection from the unit—is it correctly connected to the load? Is the coaxial cable
okay?
4.
Check the following voltages on the Power Supply. If any of the voltages are out of tolerance, correct them
before further troubleshooting.
PS1 V+
+24 V
±
0.5 V
PS2 V+
+27V
±
0.5 V
PS3 V+
+5V
±
0.5 V
PS3 V+
-15V
±
0.5 V
5.
Check the voltage on the feed thru caps of the A1 Pre-Amp, with the RF gain control at maximum gain.
Troubleshoot any incorrect voltages.
J1-1
+5 V
±
0.5 V (Gain Control @ 100%)
J1-2
-15 V
±0.5 V
J1-3
+23 V
±
0.5 V
6.
Check the voltages on the feed-thru caps of A2 Dual W-modules.
J5-4
+23V
±
0.3 V
J5-5
+23V
±
0.3 V
J5-8
-8V
±
0.3 V
Summary of Contents for 10052381
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