manual em português tektronix 2710
Hi!
Guess so i will be first to fix our Problem .-)
Mine shows strange characters on the left side of screen ("F"). The NVRAM seems not to work correct. Can not be intialized and the Address and Data line tests fail. As i try to normalize the rig, most of the tests fail... The "File System" of the NVRAM is defect and can not be repaired by the rigs software. Strange files (about 60) named "SSSSSS" that can not be deleted. Only to tell you what mine does...
I figured out that the NVRAM is a 32kx8 SRAM chip on the "Display Storage" board. The Battery (probably 3.6V) on the Display storage Boad had only 2.5V. So i replaced it by a new one (while battery was disconnected, i did short circuit the cap to bring the voltage on the SRAM completely down), but that didn't fix the Problem. The rig stills shows the same problems as before, even without the battery
So my guess is that the low VCC voltage to the SRAM, over time, kill it. Maybe the SRAM or the Bus drivers. Maybe the SRAM has only a slight fault due to the low voltage. As is disconnected the CEnot pin from the system an tied it to VCC, the display did only show dots, but no characters at all. Strange, maybe the SRAM is used as display storage, too. But that way, at least part of the RAM has to work correct. Strange thing.... I will do a bit of testing with my Scope as i get time.
If you know something new what the problems root cause is, tell me.
About the Service guide. I bought a scanned Copy as PDF for 19 Bugs :-( Best i could get... I will send you a private mail...
Jay