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1. 8.2 2. 4 3. 4 4. 4 5. 4 6. 8.2 7. 2.5 8. 8.2 9. 8.2 10. 0 11. 0 12. 0 13. 8.2 14. 0 15. 0 16. 8.2 17. 8.2 18. 0

SHOOT! Channel selector was on 36. ‍♂️ brb

Looking at the scheme and the photo I posted, I believe I counted Pin1 as Pin18 then proceeded in a counter clockwise fashion. These ic chips don’t have a marking for a starting point. Sorry about that. Please confirm I it correctly, or that I did it backwards. I can do them again or just read...

PLL: MC145106P 1) 8.2 2) 4 3) 4 4) 4 5) 4 6) 8.2 7) 2.9 8) 8.2 9) 7.6 10) 0 11) 0 12) 8.2 13) 8.2 14) 8.2 15) 0 16) 8.2 17)8.2 18) 0

Well, it is labeled a resistor array on the board but it’s a capacitor array. Right?

D40 is good. I think I’ve tested about every diode in the area, which probably means nothing because there’s always more.

Here’s a better pic. I replaced it after it didn’t result in a fix.

We Well, not exactly. When the CA is removed, it doesn’t matter what channel it’s on. The frequency becomes unstable. Did we at least resolve that the CA isn’t what’s causing some channels to be 4K off frequency? If so, what would be the next thing to check. If not, I’m not sure how to...

-IC4-IC5 1) 8-0 2) 7-0 3) 7-8 4) 0-7 5) 8-0 6) 0-7 7) 8-8 8) 0-0 9) 0-8 10) 8-8 11) 8-0 12) 0-0 13) 0-0 14) 8-8 15) 0-7 16) 8-8

I removed the CA. The frequency went to 26.9mHz and started climbing about 1k per second. So, it didn’t fix the problem but it did change the frequency. I replaced it and read voltage on the adder pins, which I’ll post below in a few minutes.

So, I should switch to Band E channel 1, not 20, and check those voltages and learn them here. Before getting those, I should remove the capacitor array to see if that resolves the issue. Sound right?

Should I provide other details?

Yes, it is a bit confusing for me. And I didn’t see this until after I got the voltages on channel 20 (which incorrectly reads 27.445). I’m going to post this. I hope the columns match up so it’s legible. [edit ic labels—now correct] IC4————-IC5 1- 0—————-0 2- 7.7—————-0 3- 7.2—————-8.2 4-...

Input voltage or voltages of every pin? If all pins, does it matter which channel I’m on? https://www.alldatasheet.com/datasheet-pdf/view/11937/ONSEMI/MC14008BCP.html

Replaced both adder chips today. No change. Assuming these chips are correct - and based on the pin-outs, it appears it should do the job, it must be something else.

Found the part on eBay. ebay.com/itm/273991136288. Bought 4 @ $4ea combined shipping. Should have in a week or so.

https://www.digikey.com/htmldatasheets/production/100088/0/0/1/mc14008b-series.html

I appreciate the work you’ve done. It’s a bit over my understanding. Essentially, it sounds like I need to test or replace the “added” but until to know what they are. Are you referring to a diode? (Ie1n4008)? [edit] I responded prematurely from my lazy boy. When I get back to the bench, it’ll...