-
You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
-
Retevis is giving away Radios for the New Year and Every Member is Eligible. Click Here to see the details!
Max 100 frequency counter
- Thread starter kaos513
- Start date
I did not notice this until today, but the LED display looks odd to me. The (+) signs are kind of mixed up.
I tested the 2 protection diodes by the gray cap i get low reading on 1 and a high reading on the next.
Eliminated the power adapter jack I put the 10 volt adapter direct seems like the power supply needs work as it still has that dot and no zeros still on front panel digit display,I have a feeling its the 2 diodes will report back with an update thanks.
If you can find the schematic for it and then check voltages in and signal out, you would probably nail where the problem is. You got into this thread with both eyes wide open wanting to fix this; but it just might be over your head if you cannot come up with the schematic - at least.
This counter is not test equipment grade, just a five place counter of little value except for monitoring.
The dots tell me that there is signal present; if it had no display at all would be just a power issue. So, most of the IC's are working, with the likelihood that one IC took a dump. Could be a driver IC; or the input IC was hit with too much input power. Hard to say from here.
Is it worth it to you - to fix it? Fixing something and understanding at least a little bit about what was wrong with it is more valuable - IMO - that just getting it fixed by someone else in the long run . . .
This counter is not test equipment grade, just a five place counter of little value except for monitoring.
The dots tell me that there is signal present; if it had no display at all would be just a power issue. So, most of the IC's are working, with the likelihood that one IC took a dump. Could be a driver IC; or the input IC was hit with too much input power. Hard to say from here.
Is it worth it to you - to fix it? Fixing something and understanding at least a little bit about what was wrong with it is more valuable - IMO - that just getting it fixed by someone else in the long run . . .
Last edited:
Replaced the diodes and still had same issue,as one diode had broken apart when I took it out like you said seemed someone injected to much power to it .
i reflowed the board now the lcd counter does flicker so maybe there is a bad chip
I read in one post that you were going to post Pin Voltages. Do you have that data? You should have 5.0 volts on all of the chips Vcc pin. You can look the chips up by typing the part number in the search bar of Bing, google or whichever search engine you use. It will show the pin in and out Vcc and ground. Do you have a scope? Or do you have a radio that will tune to 10 Mhz?
- No one is chatting at the moment.
-
-
@ BJ radionut:list'n 50.125 USB...working in shop...also 2m FM Simplex freq's 6.52...6.46 ... 6.55 etc..
-
-
@ BJ radionut:I was look'n your way Evan...was working on some lighting in the garage...you were just "Thr" but w/ fade...you were gone...so did not fire the heater and call+1
-
