QRO Technologies HF-2000 Instruction Manual
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15PERIODIC MAINTENANCEMake sure the Amplifier has been disconnected for the AC power source and the highvoltage filter capacitors have bleed down to zero.Remove the top cover from the Amplifier at least once a year and remove the dust. Dustaccumulation can help cause the variable capacitors to arc between plates. Use the blowerconnection on a vacuum cleaner or a soft bristle brush. Also, remove the tube from its socket andcheck to see if any tarnish buildup has developed on the tube socket contacts. If so, use a Q Tipand Tarn-X solution, and clean each of the socket contacts.TROUBLESHOOTING CHARTThe following charts lists specific difficulties that could occur in your Linear Amplifier. Severalpossible 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 aparticular part is mentioned as a possible cause, check that part and other componentsconnected to it to see if they are defective. AS ALWAYS, BE SURE THE AMPLIFIER POWERCORD HAS BEEN REMOVED FROM THE AC LINE RECEPTACLE AND THE HIGH VOLTAGEFILTER CAPACITORS HAVE BLED DOWN TO ZERO VOLTS BEFORE REMOVING THE TOPCOVER FOR YOUR INSPECTION.TROUBLESHOOTING CHARTDIFFICULTY POSSIBLE CAUSENo AC power 1. Fuse F1 or F2 rear panel2. Jumpers missing on Terminal Block TB13. Transformer T14. On/Off Switch SW2A or SW2B5. Interlock Safety Switch SW16. Step Start Relay K1 or related circuitryMultimeter inoperative in High VoltageFunction1. Resistors R301, R302, R303, R304, HighVoltage PCB-1102. Multimeter Switch SW401A or SW401BMeter Switch PCB-5103. M-2 MultimeterMultimeter inoperative in Plate CurrentFunction1. Resistors R308 - R310 LV & Bias PCB-2602. Switch SW401A&B Meter Switch PCB-5103. M-2 Multimeter |
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