Date
1 - 6 of 6
Orientation of EEPROM on QDX ver 4
|
Doug Kaye (K6DRK)
It's a long story, but I need to replace the EEPROM (IC6) on my version 4 QDX. The only problem is that I can't tell the proper orientation of the chip. Does the small notch on one end face the ARM processor or does it face the edge of the PCB? Thanks.
…doug
Doug, K6DRK
|
|
|
|
Hans Summers
Hello Doug Pin 1 is nearest the edge of the PCB. Pin 1 could be indicated by a notch, or sometimes they make an indentation on the chip package next to pin 1. On Wed, Nov 23, 2022 at 9:51 AM Doug Kaye <doug@...> wrote: It's a long story, but I need to replace the EEPROM (IC6) on my version 4 QDX. The only problem is that I can't tell the proper orientation of the chip. Does the small notch on one end face the ARM processor or does it face the edge of the PCB? Thanks. |
|
|
|
Doug Kaye (K6DRK)
Thanks, Hans! I'm so impressed with QRP Labs support. So much better than for products that cost 20x as much. I'm a fan!
…doug, K6DRK
|
|
|
|
Doug Kaye (K6DRK)
Well, I was wrong about the notch. Turns out there are two notches, one on each end. The thing is entirely symmetrical! The only other clue is the printing on the case. Should that printing be right-side-up with the BNC connector at the "top"? Or is that not a reliable way to know?
...doug, K6DRK |
|
|
|
Hans Summers
Hello Doug What a silly chip! The orientation of the text printing (part number printing) IS a reliable way to know. The printing will be "right way up", when the BNC connector is at the "bottom". So you install the EEPROM chip, when holding the PCB with the BNC connector DOWNward, so that the text printed on the EEPROM chip reads correctly, right way up. Hopefully you can see the attached photo I just took, and hopefully it is clear from that. On Wed, Nov 23, 2022 at 10:13 AM Doug Kaye <doug@...> wrote: Well, I was wrong about the notch. Turns out there are two notches, one on each end. The thing is entirely symmetrical! The only other clue is the printing on the case. Should that printing be right-side-up with the BNC connector at the "top"? Or is that not a reliable way to know? |
|
|
|
Doug Kaye (K6DRK)
Good news, Hans! I think the replacement EEPROM solved the problem. It was a little tricky soldering a SMD by hand, but I got it. Telnet stuff all works and the default values appear as expected. It's midnight here, so testing with WSJT-X will have to wait for the morning. But at least I didn't make anything worse. Thanks again.
...doug K6DRK |
|
|