HP Forum Archive 13

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HP41C: successful transplantation (no more high consumption) Message #1 Posted by Vieira, Luiz C. (Brazil) on 8 June 2003, 9:56 p.m. Latest news: after receiving a donated RAY-xxxxx LCD driver, an HP41C with high-current consumption shows signs of full rehabilitation. Life signals are fine and current consumption lies under expected low values. Thank you all, WAG mostly, for your support and interest. May these news help others, too. If you want to know more, former thread is: HP41C: High current consumption Best regards. Luiz C. Vieira - Brazil Edited: 8 June 2003, 10:08 p.m.

Re: HP41C: successful transplantation (no more high consumption) Message #2 Posted by David Smith on 9 June 2003, 10:43 a.m., in response to message #1 by Vieira, Luiz C. (Brazil) The RAY-xxxx chip is the DC-DC converter/power supply chip. It was manufactured by Raytheon. It is apparently a bipolar (NPN/PNP transistor) technology and not CMOS.

Any possible replacement? Internal design? Message #3 Posted by Vieira, Luiz C. (Brazil) on 9 June 2003, 12:01 p.m., in response to message #2 by David Smith Hi, David; bipolar technology was supposed to be harder to toast than CMOS under certain circumstances... Anyway, bipolar components may drift and cause instability, too. Thank you for your information. Have you ever heard about RAY-converter internals or equivalent? Even if it is not pin-compatible? Best regards. Luiz C. Vieira - Brazil

Re: Any possible replacement? Internal design? Message #4 Posted by David Smith on 9 June 2003, 3:50 p.m., in response to message #3 by Vieira, Luiz C. (Brazil) No, the chip is an HP custom chip. Only source would be another machine.

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