Textronix AM503B codes

davidsrsb · 11th February 2006, 02:04 AM

My current probe amplifier has died.
Does anybody know what code 355 means on an AM503B current probe amplifier?

davidsrsb · 11th February 2006, 10:10 AM

I had a quick look inside and there are two +5, -5, +15 and -15 regulators, all working.
There is a 1.5V battery that has gone flat and leaked.
No sign of dry joints or burning.

poobah · 11th February 2006, 02:06 PM

Dave,

I have plenty of the old style (pure analog) AM503's if that would help. Can't help you fixing the digital unit though.

I'll bet that battery was there to maintain calibration coefficients in RAM as this was designed before FLASH memories came into being.

davidsrsb · 13th February 2006, 03:04 PM

I fitted a new battery and the error code went away. Now the degauss and probe open warning do not work. I don't think the probe is being detected

poobah · 13th February 2006, 04:03 PM

Does it measure now? I'll bet your out of calibration...

Probably have to send it back to TEK...

There might be a couple of pins somewhere you can connect to force the unit to reload it's bios and default calibration coefficients from ROM.

Can you find a schem?

anatech · 13th February 2006, 04:16 PM

Well, if it goes back to Tek, at least it'll be calibrated properly. That should last you a while.

-Chris

11th February 2006, 02:04 AM	#1
davidsrsb diyAudio Member Join Date: Dec 2005 Location: Kuala Lumpur	Textronix AM503B codes My current probe amplifier has died. Does anybody know what code 355 means on an AM503B current probe amplifier?

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
About tube codes	Devius	Tubes / Valves	10	4th September 2011 12:13 AM
Siemens codes	parrot	Tubes / Valves	0	21st January 2008 06:02 AM
understanding transformer codes	Nanook	Tubes / Valves	2	7th March 2006 04:00 AM
jp1 Remote codes	cyberdemon1	Everything Else	0	28th February 2006 02:14 AM
GEC date codes	EC8010	Tubes / Valves	5	23rd June 2003 10:48 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

11th February 2006, 10:10 AM	#2
davidsrsb diyAudio Member Join Date: Dec 2005 Location: Kuala Lumpur	I had a quick look inside and there are two +5, -5, +15 and -15 regulators, all working. There is a 1.5V battery that has gone flat and leaked. No sign of dry joints or burning.

11th February 2006, 02:06 PM	#3
poobah diyAudio Member Join Date: Nov 2005	Dave, I have plenty of the old style (pure analog) AM503's if that would help. Can't help you fixing the digital unit though. I'll bet that battery was there to maintain calibration coefficients in RAM as this was designed before FLASH memories came into being.

13th February 2006, 03:04 PM	#4
davidsrsb diyAudio Member Join Date: Dec 2005 Location: Kuala Lumpur	I fitted a new battery and the error code went away. Now the degauss and probe open warning do not work. I don't think the probe is being detected

13th February 2006, 04:03 PM	#5
poobah diyAudio Member Join Date: Nov 2005	Does it measure now? I'll bet your out of calibration... Probably have to send it back to TEK... There might be a couple of pins somewhere you can connect to force the unit to reload it's bios and default calibration coefficients from ROM. Can you find a schem?

13th February 2006, 04:16 PM	#6
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Well, if it goes back to Tek, at least it'll be calibrated properly. That should last you a while. -Chris