Alpha 8410 Linear Amplifier User Manual
RKR Designs LLC
Diagnosing Faults and Troubleshooting
DOCNUMBER 8410
Document Issue 1.1
Page 7–4
August 2015
77
7
the amplifier back on. Doing so is likely to result in severe
damage to amplifier components.
2. If the plate current again starts to rise while the amplifier is warming
up, investigate and resolve the problem before attempting to turn the
amplifier on again.
3. Fix any problems in the bias-control circuitry.
4. When you are certain that you have taken care of the problem that
caused the fault, turn the amplifier back on.
7.2 Troubleshoot Problems
Amplifier does not turn on;
nothing happens when the
ON switch is pushed
1. External AC wiring, a fuse, or a circuit breaker may be open. Check
and correct wiring, replace fuse, or reset circuit breaker.
2. The amplifier cover may not be in place or properly secured or the
cover safety interlock may be open. Ensure that the cover is in place
and all screws are securely inserted.
3. One or more connectors may be loose. Check that all of the
transformer connectors are securely attached, that the 3x3 molex
connector at the back of the amplifier is fully engaged, and that the
two connectors between the transformer and the HV power supply
boards are firmly inserted.
4. Fuse F1–F3 may be open or missing. Check fuses with an ohmmeter.
Replace any blown fuses with fuses of the same size.
5. The step-start resistor may be open. Check the resistor. If it is
damaged, replace it.
Amplifier turns on but no HV
is indicated by the multimeter
LED bargraph
1. The multimeter selector switch may be in the wrong position
(example: Ip). Set the switch to the correct position.
2. The transformer may be plugged into the power supply incorrectly.
Check the power-supply wiring and connectors to ensure that the
input and output connectors and the voltage taps are set properly.
3. An HV circuit fault may exist. Check the line voltage.
4. The HV sampling resistor in the power supply may be damaged.
Contact RKR Designs technical support.
