1

MC624 Monitor Controller / Re: Remote unit not communicating with MC624

« on: March 04, 2025, 01:26:58 AM »

I decided to reflow the entire remote unit just in case, but alas, no change.
Maybe you could explain how to check the signal across R 5, please.
Not sure how to send pics in this forum, don't understand the Url setup.
(I guess I'll have to email them directly to JPK/SS)

2

MC624 Monitor Controller / Re: Remote unit not communicating with MC624

« on: March 02, 2025, 11:28:43 PM »

The voltages are right on, (not sure what you mean about the signal being seen across R5),
I will reflow  some joints and see, and get back some pics to you if nothing changes.

3

MC624 Monitor Controller / Re: Remote unit not communicating with MC624

« on: March 01, 2025, 11:46:49 PM »

I went through the remote unit, and it all looks decent, lifted and reseated the two IC's, double checked the transistors, the solder joints look good, don't feel like reheating the whole board yet, is there not anymore "troubleshooting/testing" that can be done, how do we know that the 20' usb cable is passing anything more than just power?

4

MC624 Monitor Controller / Re: Remote unit not communicating with MC624

« on: February 28, 2025, 07:16:17 PM »

I'm not sure what's different today, but the 12V pin measures 11.25v now- with or without the Rem hooked up, the 12v adapter does read 12 V, the unit has been in Master mode.

5

MC624 Monitor Controller / Re: Remote unit not communicating with MC624

« on: February 27, 2025, 04:16:58 PM »

The Remote is totally non responsive, the display (-63) comes on immediately and stays, with no correlation with the main unit, and the first input and output light up as well.
The main unit works well, and programs fine, whether it's plugged in to the remote or not.
the V pins are spot on for the 3.3, 5, 16 and -16, but the +12 V pin reads + 6 V.
the TP pins read -5V.

6

MC624 Monitor Controller / Remote unit not communicating with MC624

« on: February 26, 2025, 06:23:16 PM »

My newly built MC 624 seems to be working well, but when I attempted to connect the Remote unit, it only displays  -63 and lights up the first input and output only, and not responsive to any controls. I put a jumper on +12, since the PC board is V1.4, both microcontroller chips are V1.8.
Suggestions?