zener in HP 6111A D.C. power supply
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zener in HP 6111A D.C. power supply

 
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Joe L.
Guest
Posted: Fri Sep 02, 2005 12:35 am    Post subject: zener in HP 6111A D.C. power supply Reply with quote
Hi. I'm repairing a H.P. 6111A D.C. power supply and need to replace a
shorted diode. It is CR32. If anyone out there has the service manual,
could you please tell me what this part is? It seems to be marked
GE1-3.2Z so it's not a stretch to think that it's a 3.2V zener, but I'd
like to know for sure. Thanks.

--
Joe

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Robert Baer
Guest
Posted: Fri Sep 02, 2005 2:16 pm    Post subject: Re: zener in HP 6111A D.C. power supply Reply with quote
Joe L. wrote:

Quote:
Hi. I'm repairing a H.P. 6111A D.C. power supply and need to replace a
shorted diode. It is CR32. If anyone out there has the service manual,
could you please tell me what this part is? It seems to be marked
GE1-3.2Z so it's not a stretch to think that it's a 3.2V zener, but I'd
like to know for sure. Thanks.

--
Joe
However, as the zener voltage goes down, their abruptness degrades as

well,and a 3.2V zener is not much better than a forward biased diode.
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Dave
Guest
Posted: Mon Sep 05, 2005 8:35 am    Post subject: Re: zener in HP 6111A D.C. power supply Reply with quote
Robert Baer wrote:
Quote:
Joe L. wrote:

Hi. I'm repairing a H.P. 6111A D.C. power supply and need to replace a
shorted diode. It is CR32. If anyone out there has the service manual,
could you please tell me what this part is? It seems to be marked
GE1-3.2Z so it's not a stretch to think that it's a 3.2V zener, but
I'd like to know for sure. Thanks.

--
Joe

However, as the zener voltage goes down, their abruptness degrades as
well,and a 3.2V zener is not much better than a forward biased diode.

Is that because the low-voltage ones use the zener process, whereas the
high voltages ones use an avalanche process? I'm just interested. Sorry
I can't help the OP about that diode.

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Jules
Guest
Posted: Fri Sep 09, 2005 9:48 pm    Post subject: Re: zener in HP 6111A D.C. power supply Reply with quote
Joe - CR32 is to protect against application of reverse polarity from any
external source. It is spec'd as "200V 500mA" so any fat rectifier type
would do. There is some virtue in using a device with a smallish current
rating, 1N4001 etc, as these should fail 'short' as yours did, providing
permanent protection!
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Joe L.
Guest
Posted: Sat Sep 17, 2005 12:35 am    Post subject: Re: zener in HP 6111A D.C. power supply Reply with quote
In article <4321e488$1@news.greennet.net>,
"Jules" <jx.omegxa@memxbers.v21.cxo.uk> wrote:

Quote:
Joe - CR32 is to protect against application of reverse polarity from any
external source. It is spec'd as "200V 500mA" so any fat rectifier type
would do. There is some virtue in using a device with a smallish current
rating, 1N4001 etc, as these should fail 'short' as yours did, providing
permanent protection!



Jules,

Thanks for the info. I installed a 1N4003 and the power supply is back
to normal. I appreciate the help.

--
Joe
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