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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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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 |
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