Recent content by Chris Lawrence

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...

No mod was done No mod has been done. Shouldn’t be looking at the channel selector?

Various channels are off by 40kHz, if my math is right. This is the 690011D board like the dx959 and 98vhp, not like the old 99v 3600 board. The following channels read 40,000hz high. Example: 36=27.4050 instead of 27.3650 1.5,6,7,12,13,18,19,20,23,26,27,28,33,34,35,36. The only channels that...

All aligned. Opened clarifier. Yes, Frequency display matches. The vr on the display always takes about a 1/4 turn clockwise to read correctly. Like to see it flip from 4 to 5 right when the clarifier moves right on frequency. Not a fan of the big slide as they’re already touchy. The 10 turn is...

Found it! Turns out the trace between D50 and L20 was pulled up. It was almost unnoticeable until I put on my magnifying head set. SMH Undoubtedly that was my fault. The original problem was the lead from the mode switch. I got ahead of myself when diagnosing; reflowed solder joints and...

I’ll tackle this section first because it may change further instructions. I’ll log my process here while testing. *TP3 = 16.5288xx on all of the following: -BK 1856D -BK1823A linked to 10mHz oscillator-if that helps at all. *RF Output on ch20 = 27.2238xx on: -Both BK’s -Rigol spectrum...

Copy that. As mentioned, edited previous reply for clarity. Other info I can provide for you?

Correct. TP5 is the test point and L23 is working. Aligned to 10.695 in TX. I should have typed a bullet point * at the beginning of the next sentence stating that L20 is not effecting TP3. Will edit.

8v wire at Mode Switch was torn at plug. Looks like it was holding on by a strand or two and finally broke loose. New radio smh. *Once 8v was restored at mode switch, AM now has RF power out. [edit] *L23 does adjust TX @TP5 on TX [edit] *L20 does NOT adjust frequency @TP3. *8v to d85, d95...

Copy that, Doc. Makes perfect sense. I’ll go through it.m hopefully tomorrow. With regard to VR7, I’ll be opening the clarifier anyway. Step one is just to resolve this issue in stock condition. Thanks.

Will do. It will be tomorrow hopefully. Thank you.

I’m following the alignment procedures on cbtricks (ch 20). *PLL Alignment Tp2 2.8v good Pin 8 IC3 10.2400 good TP3 adjust L15 for max on scope. Done TP3 USB 16.5125 good TP3 LSB 16.5075 good Tap3 AM 16.5100 fail. Actual 16.51240 ish (L20 adjust only about 30Hz or so). *TX alignment: TP3 LSB...

Will do thanks. When I said 4K, that was at the display. 27.205-27.201. Will test shortly. Thanks again