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test_equipment:replacing_rotary_encoder_lamp [2013/01/08 19:00] (current)
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| | ====== Replacing Rotary Encoder Lamp on various HP equipment ====== |
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| | //mikenearlibertymo wrote: // \\ |
| | //> I recently bought a couple units off ebay and one had no manual sweep // \\ |
| | //> or step functions. The problem was a burnt out grain of wheat lamp in // \\ |
| | //> the opto resolver. The lamps are same/similar to what you find in // \\ |
| | //> those "Mag" machined aluminum flashlights. I used a 6.3V unit to fix // \\ |
| | //> it. // \\ |
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| | If you are talking about the rotary encoder used for operator input on the front panel of many HP instruments of this era, the lamp is actually a grain-of-wheat coiled filament lamp rated at 5 volts. The exact replacement lamp is a type 683, available today from all the large supply houses. Failure is common and replacement straightforward, after getting the correct lamp. |
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| | Best wishes, |
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| | Larry McDavid W6FUB \\ |
| | Anaheim, CA (20 miles southeast of Los Angeles, near Disneyland) |
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| | //More information on September 23rd: // |
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| | If your encoder is the type with the removablel back cover its probably repariable. I just finished repairing a couple of them for some HP 8660 sig gens. They used a tungston lamp and a couple photo diodes internally. Just replace the lamp test/adjust outputs, and you're back in business. |
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| | I purchased my lamps from www.KensElectronics.com for about $5. |
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| | Mikenearlibertymo@yahoo.com |
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| | Mike |
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