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HP 8935 has false alarm for overvoltage duplex out

J Mcvey All Messages By This Member #1071 opened the I/O module on the underside next to the I/O panel. What are the silk screen number (s) for the detection? diodes? I see some of tht SOT23 packages labeled CR1 to 4 and cr200 and cr201. I sure wish schematics were available for this thing!
J Mcvey All Messages By This Member #1037 On Mon, May 6, 2024 at 11:07 AM, rab@... wrote: BAS70-05? Thansk you very much. I'll get some before I open the beast.
[email protected] All Messages By This Member #1036 开云体育 The Diodes (2) to detect duplex port power were HSMS-2800-TR1 but are no longer available. The replacement is: BAS70-05?? the Mouser elect part is: 771-BAS70-05-T/R Good luck...Rick toggle quoted message Show quoted text _._,_._,_
J Mcvey All Messages By This Member #1035 What kind of diodes are they? I tried putting a load on the duplex port, thinking that might make it happy, but unfortunately it didn't help.
[email protected] All Messages By This Member #1034 Jim, duplex alarm is generally the 2 diodes right at the duplex output (in the input module).? Are leaky/open. Rick On May 3, 2024 2:14 PM, "J Mcvey wrote: toggle quoted message Show quoted text I get the duplex overvoltage message with the alarm sound which drives me nuts.
J Mcvey All Messages By This Member #1033 I get the duplex overvoltage message with the alarm sound which drives me nuts. I am not even using the duplex out!? I mostly use RF I/O for my application. I tried measurement reset, but it continues with the alarm and message with no relief . Is there a way to shut off the alarm? I suppose this problem is telling me the power supply needs attention or something. The test set seems to work otherwise. Any help or insights would be greatly appreciated. thanks, Jim

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