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1502: Difference between revisions
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→Repair issues
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and the unit will appear dead. The pack is rebuildable with NiCd battery cells. To operate without | and the unit will appear dead. The pack is rebuildable with NiCd battery cells. To operate without | ||
a battery in place use a 200 to 270 Ω / 10 W power resistor in parallel with a 2200 μF cap (> 25 V); this | a battery in place use a 200 to 270 Ω / 10 W power resistor in parallel with a 2200 μF cap (> 25 V); this | ||
will fool the power supply protection circuit into thinking that it's charging a valid battery. | will fool the power supply protection circuit into thinking that it's charging a valid battery. THe current drawn from the batteries is approx. 200 mA. Original batteries can be replaced by e.g. AA NiMH batteries with 2000 mAh for similar operating time. | ||
Another common failure is a defective DISTANCE dial. Operators expect the numerical readout of this dial to go from zero to 999 and it is not designed to do that. Often, the internal plastic stops get broken from operators forcing the dial past its intended stop, rendering the part useless. | Another common failure is a defective DISTANCE dial. Operators expect the numerical readout of this dial to go from zero to 999 and it is not designed to do that. Often, the internal plastic stops get broken from operators forcing the dial past its intended stop, rendering the part useless. | ||