Hi,
WD40 is better than the alcohol to remove acid action from the electrolytics! WD40 don't cause any problem in the board with fiberglass epoxy clad. The A5 board don't suffer this problem wits "HF", don't have enough to capacitance to act in low frequebcy pulses.
The microprocessor clock is 20MHz, and working very well after all!
Hi,
WD40 is better than the alcohol to remove acid action from the electrolytics! WD40 don't cause any problem in the board with fiberglass epoxy clad. The A5 board don't suffer this problem wits "HF", don't have enough to capacitance to act in low frequebcy pulses.
The microprocessor clock is 20MHz, and working very well after all!
Hi,
Has anybody come across this issue - readout display is shifted too far to the right, see photo. The problem is that if you look at the display not directly but from an angle, some characters covered by CRT frame and not visible.
Service manual offers no adjustment to shift readout display horizontally. But must be something in readout schematic to tweak it?
Mark
I wouldn't use Water Displacement 40 on a digital PCB. The nearest I use is Craig DeOxit, and I'm careful to use that only on contacts.
I wouldn't use Water Displacement 40 on a digital PCB. The nearest I use is Craig DeOxit, and I'm careful to use that only on contacts.
There is a WD40 branded contact cleaner which is probably much the same as any other contact cleaner, Servisol etc. That may be the source of confusion here. As for classic WD40, used for cars and lawnmowers etc, it's absolutely the wrong thing thing to use on electronics.
Yes it does. Section 5-13 of the 2465B Service Manual. Read the entire section carefully. It adjusts the horizontal centering which should fix the readout offset.
Yes it does. Section 5-13 of the 2465B Service Manual. Read the entire section carefully. It adjusts the horizontal centering which should fix the readout offset.
That's it! This is what I was needed. Thank you. It's a R801 if somebody will be looking for it.
The battery read 3.2V, but just touching the DMM with the fingers dropped to 2.7V, so go figure if only the capacitive kick when touching the + terminal with the earthed iron (Battery not earthed though) was enough to kill the data.
...
About the DS1225Y NVRAM, do we know what else is stored there?
I know cal data is @ 0x1FE00 - 0x1FFFF, but the scope displays a lot of interrogation signs when not programmed properly.
From now I'll use the EXER 02 procedure to manually extract the cal data on still working scopes, before touching anything, hand-copying 512bytes will take 10 minutes, but way less than running a full calibration!
But some 2465B have extra boards on them (I.E. GPIB, TV(?) modules), I have no idea if they're recognized automatically or they need to me added manually in the diagnostic menu?