QRO Technologies HF-3KDX, Инструкция по эксплуатации

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14
USING THE FRONT PANEL ALC CONTROL TO ADJUST
AMPLIFIER OUTPUT POWER.
You may want to utilize an alternative to adjusting the drive power at the transceiver. The Front
Panel ALC Adjustment Control allows you to adjust the ALC for the amount of output power you
desire. Using this procedure, you would set the ALC Control to minimum (fully counter-clockwise).
Tune the amplifier for maximum output. Then advance the ALC Control (clockwise) for the amount
of output power you want. The ALC circuit of the amplifier supplies negative feedback voltage to
the transceiver which reduces the amount of drive coming into the amplifier.
Only use this
feature after your Amplifier has been properly tuned.
PERIODIC MAINTENANCE
Before you do any maintenance, make sure the amplifier has been disconnected for the
A.C. power source and the high voltage filter capacitors have bleed down to zero.
Remove the top cover from the Amplifier at least once a year and remove any dust accumulation
on the blades of the blower. Any large accumulation of dust on the blades will impede proper
cooling air to the tube.
TROUBLESHOOTING CHART
The following charts lists specific difficulties that could occur in your Linear Amplifier. Several
possible causes may be listed for each difficulty. Refer to the Printed Circuit Board diagrams
(PCB) and the Schematic Diagrams to locate and identify the parts listed in this chart. If a
particular part is mentioned as a possible cause, check that part and other components connected
to it to see if they are defective.
AS ALWAYS, BE SURE THE AMPLIFIER POWER CORD HAS
BEEN REMOVED FROM THE AC LINE RECEPTACLE AND THE HIGH VOLTAGE FILTER
CAPACITORS HAVE BLED DOWN TO ZERO VOLTS BEFORE REMOVING THE TOP COVER
FOR YOUR INSPECTION.
DIFFICULTY POSSIBLE CAUSE
No AC power
1. Fuse F1 or F2 rear panel
2. Jumpers missing on Terminal Block TB1
3. Transformer T1
4. On/Off Switch SW2A or SW2B
5. Interlock Safety Switch SW1
6. Solid State Relays SR1 or SR2 or related
circuitry
Multi-meter inoperative in High Voltage
Function
1. Resistors R101
– R 109 High Voltage Diode
PCB
2. Multi-meter Switch SW1 Meter Switch PCB
3. M-1 Multi-meter
4. Transformer T-1 Secondary