Products > Test Equipment
Agilent 54835A scope (4 channel 1GHz / 4Gs/s) repair & uphack
nctnico:
Too bad the scope won't work with the flatcable disconnected.
The OKI M5416283 are DRAMs with fast serial ports for video purposes. Basically you can write data while the video data is being output at a constant rate. I'd check the address lines on these chips and see if any one of them is out of the ordinary (doesn't change at all or has levels half way the power supply).
analogRF:
yes, I will do that but I need extender cables to arrive because I have no access to the boards to do any measurements...
for now I will check the basics such as pull up resistor arrays and also tantalum caps...
analogRF:
took the boards out. checked the resistor arrays and they are all ok....so are the caps but it is hard to tell inside the circuit...the battery still has 3.2V after 20 years
nctnico:
--- Quote from: analogRF on October 02, 2018, 09:39:17 pm ---took the boards out. checked the resistor arrays and they are all ok....so are the caps but it is hard to tell inside the circuit...the battery still has 3.2V after 20 years
--- End quote ---
It doesn't hurt to get a magnifier and check the solder joints.
analogRF:
of course. I did that...cleaned the contacts and put them back in and of course no change... :-//
the scope is well calibrated and works so beautifully except that glitch when the graphic display is off
even measurements in that mode are all ok and spot on just the way that the points are drawn in the display is wrong and only in the graticule area
i wonder how it passes all those video memory tests...i will be waiting for the extender cables to come and and have another crack at it with a scope.
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