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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.

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.

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

No, the chip is an HP custom chip. Only source would be another machine.