Someone asked me about these oscilloscopes. Apparently he has a dozen
of them that do not power up. No display or backlight on the LCD. Yes,
AC power is set correctly. I haven't seen them so don't really have any
more info.

Anything common with these?

Thanks!

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(Samuel M. Goldwasser) writes:

Someone asked me about these oscilloscopes. Apparently he has a dozen
of them that do not power up. No display or backlight on the LCD. Yes,
AC power is set correctly. I haven't seen them so don't really have any
more info.

Anything common with these?

Should have mentioned that these are Philips analog scopes in case
the model is ambiguous.

--
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On 18 Oct 2009 13:15:00 -0400, (Samuel M.
Goldwasser) wrote:

Someone asked me about these oscilloscopes. Apparently he has a dozen
of them that do not power up. No display or backlight on the LCD. Yes,
AC power is set correctly. I haven't seen them so don't really have any
more info.

Anything common with these?

Thanks!

It appears the schematic can be found here. NOTE: Three parts.
http://www.eserviceinfo.com/download...ps_PM3055.html

PlainBill

Samuel M. Goldwasser wrote:
Someone asked me about these oscilloscopes. Apparently he has a dozen
of them that do not power up. No display or backlight on the LCD. Yes,
AC power is set correctly. I haven't seen them so don't really have any
more info.

Anything common with these?

Thanks!

--
sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
Electrolytics, almost always on these, throughout the PSU, input
attenuator board, XYZ board. Usually all will need replacing, can total
30-40 caps. Tedious job for a 50/60MHz scope. Couple of unavailable
IC's in the preamplifier fail regularly causing offset traces.
Backlights usually fail on the LCD but you won't know until you get the
scope up and running, its just a mini filament lamp, available from
www.jetecnet.com

JC

writes:

On 18 Oct 2009 13:15:00 -0400, (Samuel M.
Goldwasser) wrote:

Someone asked me about these oscilloscopes. Apparently he has a dozen
of them that do not power up. No display or backlight on the LCD. Yes,
AC power is set correctly. I haven't seen them so don't really have any
more info.

Anything common with these?

Thanks!

It appears the schematic can be found here. NOTE: Three parts.
http://www.eserviceinfo.com/download...ps_PM3055.html

Yes, thanks, I had already found that. Unfortunately, I don't have them
in my possession and I doubt that the person who does would be able to
do any serious troubleshooting.

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Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
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Important: Anything sent to the email address in the message header above is
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Archon writes:

Samuel M. Goldwasser wrote:
Someone asked me about these oscilloscopes. Apparently he has a dozen
of them that do not power up. No display or backlight on the LCD. Yes,
AC power is set correctly. I haven't seen them so don't really have any
more info.
Anything common with these?
Thanks!
--
sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/

Electrolytics, almost always on these, throughout the PSU, input
attenuator board, XYZ board. Usually all will need replacing, can
total 30-40 caps. Tedious job for a 50/60MHz scope. Couple of
unavailable IC's in the preamplifier fail regularly causing offset
traces. Backlights usually fail on the LCD but you won't know until
you get the scope up and running, its just a mini filament lamp,
available from www.jetecnet.com

Thanks! That's exactly the type of information I was looking for.
The owner won't be happy.

--
sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.