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Vintage Computers Any vintage computer systems, calculators, video games etc., but with an emphasis on 1980s and earlier equipment. |
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Thread Tools |
8th Sep 2013, 12:11 pm | #1 |
Heptode
Join Date: Aug 2009
Location: Worthing, Sussex, UK.
Posts: 661
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Epson PX8 Printer Problem.
I have an epson PX8 that has died. I have checked the voltage rails and also the CPU clocks and they appear in order, address and data lines are moving.
When I power it on it does not display anything on the lcd screen, but the CAPS lock light comes on sometimes. Any ideas? |
19th Sep 2013, 2:48 pm | #2 | |
Dekatron
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,553
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Re: Epson PX8 Printer Problem.
Quote:
Unlike modern alphanumeric LCD displays, first generation LCDs often needed a negative bias voltage for the contrast circuit, with the -Ve supply possibly generated by a dedicated negative output from the main PSU, or an ICL7660 voltage inverter IC, or a switched-mode power supply using a general purpose switchmode IC or a discrete oscillator circuit. Could this be your problem? (By the way, did you really mean 'printer' in your subject heading? Or did you mean 'computer'? I know that there was actually a printer for the PX8 but I've never seen one with a caps lock light). Last edited by SiriusHardware; 19th Sep 2013 at 2:57 pm. |
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