https://www.newhavendisplay.com/nhd0216k1znsrgbfbwrev1-p-2844.html*Characters ain't trully white in my pics but RGB. Its the close up brightness that throws the phone's color balance off.
Hi Jan,
thank you! Too bad I did not think to make pics during the bending of the pins....
and it indeed it was a chore to solder the LTC chip - even using chipquick and hot air.
i havent managed to actually test it yet, last thing is finding a BNC that can fit the hole of the pin jack socket for SE operation, the AR just turns on and displays ... well something, i will post a pic once I get back home ad I am traveling for work , so maybe you can tell me if everything is OK.
for now I’m satisfied!
basically yes all this values with no input, just stand alone. if i short the bnc input nothing happens values stay the same
There's no calibration. Do you have the User Guide?
I'll send you some test points later today.
Edit I'll do it right now. With the 0dB 1V situation as above, please measure the AC signal at pin 1 of U2, the AD635.
Be careful not to short any pins.
Also measure DC voltage at test point VP10 as shown.
You can use TP4 as the ground pin for your meter.
Jan
I'll send you some test points later today.
Edit I'll do it right now. With the 0dB 1V situation as above, please measure the AC signal at pin 1 of U2, the AD635.
Be careful not to short any pins.
Also measure DC voltage at test point VP10 as shown.
You can use TP4 as the ground pin for your meter.
Jan
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These values are correct, so that part works.
With the signal input at 1V and 1V out at 0dB, if you change the setting to -6dB, does the output drop to about 0.5V?
Jan
Yes, that's how it looks, that there's an issue with a relay. The software works, the analog chain works, the RMS to DC converter works.
I can think of two possible issues: the -6dB relay K2 is inserted wrong way around, or the flat cable between the two boards has an issue.
Let's try another relay, K3. With 1V in, 0dB and 1V out, switch the setting to -12dB. If K3 works (and the flat cable is OK) the output should drop to about 0.25V.
It's anyway a good idea to check polarity of the relays and the seating of the flat cable.
Jan
I can think of two possible issues: the -6dB relay K2 is inserted wrong way around, or the flat cable between the two boards has an issue.
Let's try another relay, K3. With 1V in, 0dB and 1V out, switch the setting to -12dB. If K3 works (and the flat cable is OK) the output should drop to about 0.25V.
It's anyway a good idea to check polarity of the relays and the seating of the flat cable.
Jan
yes at -12, correct seems k3 works as voltage drops to 0.25v.
Cable seems to be pushed all the way down and in. Orientation of relay seems fine?
Yes correct seems k3 works as voltage drops to 0.25v.
Cable seems to be pushed all the way down and in. Orientation of relay seems fine?
Cable seems to be pushed all the way down and in. Orientation of relay seems fine?
Yes correct seems k3 works as voltage drops to 0.25v.
Cable seems to be pushed all the way down and in. Orientation of relay seems fine?
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Yes seems fine. Can you verify that the command to relay K4 switches when you go from 0dB to -6dB, pin 16 of U1 (the relay driver).
If that works, it might be the K4 relay or possibly a forgotten solder pin on K4, happens to the best of us.
If that doesn't work it might be a wire of the flat cable not correctly connected.
In that case, check that the relay command switches at pin 11 of the processor chip, this is not easy to test that, be careful of shorts.
You can also check this at pin 2 of the header if you remove the cable from the display board.
Jan
If that works, it might be the K4 relay or possibly a forgotten solder pin on K4, happens to the best of us.
If that doesn't work it might be a wire of the flat cable not correctly connected.
In that case, check that the relay command switches at pin 11 of the processor chip, this is not easy to test that, be careful of shorts.
You can also check this at pin 2 of the header if you remove the cable from the display board.
Jan
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So use tp4 as before with my DMM and measure at pin 16 of U1 in DC?
How do I check the rely command?
Checked soldering and it's all there.
Thanks
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