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HP 3336B blank display

Question asked by daver76 on Jan 8, 2014
Latest reply on Feb 6, 2014 by daver76

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Unit was working fine. Hadn't powered it up in about a month and when I did the led displays (numeric and led) were all blank. Checked +5v, +15v and -15v power supplies for level and ripple and all were fine. Checked that +5v was getting to front panel display and it was. Looks like something on the processor board? Any suggestions where to start?

Edited by: daver76 on Jan 19, 2014 11:50 AM

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daver76 Jan 19, 2014 10:45 AM
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The unit is an HP3336B generator, not an HP3333B. No wonder I didn't get any replies.
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daver76 Feb 6, 2014 3:13 PM
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A signature analysis indicated that all the ICs associated with the HP-IB system had incorrect signatures. It turns out that the HP-IB section uses isolated power and has its own power supply on the A6 board. The bridge rectifier had blown out one leg and insufficient voltage was being generated to run the 5v regulator on the A6 board. This is not the +5v on the power supply board.
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HP 3336B blank display

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