Tektronix TDS540 repair help please.....
Hi all...
I have acquired a scrapped TDS540 which has become a bit of a restoration project. It originally failed Acq/Proc Interface, Acquisition and Attn/Acq Interface. Opening it up there was evidence of electrolyte leakage from and subsequent corrosion around the SMT electrolytic caps. Replacing the SMT electrolytic caps on every board plus a thorough degrease and clean reduced the power on errors to just Fail ++ Acquisition. The trigger threshold was not adjustable - always triggered at 0V. This I traced to an open circuit via under a resistor (U1550 Pin 7 to U1552 pin 16) I have repaired the via and the scope now appears to work correctly but still has the Fail ++ Acquisition fault at power on. The entry in the error log is as follows: 181890:23:59 ERROR: diagnostic test failure ctlConfidencDiag, **2.50e-9=exp=1.20e-8 actual=4 I know that this scope is no longer supported and that schematics are not available but If anyone here has experience working on them and knows what this error message means I would greatly appreciate a hint as to which area of the PCB I should be looking at. My reply email address is corrupt to stop the spambots. Please respond here or mail r o b i n b o w d e n (a-t) d i e 4 l a s e r (d-o-t) c o m Thanks & regards, Robin Bowden |
All times are GMT +1. The time now is 06:38 PM. |
Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004 - 2014 DIYbanter