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577/Repairs: Difference between revisions
→SYMPTOM: Power Indicator Light does not come on.
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Next step is adjust and calibrate per the Service Manual. | Next step is adjust and calibrate per the Service Manual. | ||
== | ==Symptom: Power Indicator Light does not come on.== | ||
Found Power indicator lamp holder dangling inside the chassis. | |||
Obvious why the indicator was dark. | |||
This is a 5V 60 mA incandescent lamp. Smaller than a grain of rice. No replacement on hand, but I have a ton of LED's of a similar size and shape. | |||
Unsolder the wires and remove the dead lamp from the holder base. | |||
Fit a suitable LED to the base and select a current limiting resistor to keep the 5V high current supply from burning out the LED. | |||
I have 5V and 15.4 mA going to the LED. It seems to work just fine. | |||
Solder this holder base to the wire harness. | |||
Plug it in, being careful to observe proper polarity. Brown is 5V Red is Ground (strange choice of colors, but no one asked me.) | |||
Attach the holder base to the front panel indicator lamp holder. | |||
Turn on and we now have a working power indicator. | |||
Color is yellow instead of green, but that is of no consequence to me. | |||