[2019-12-15 19:54:44 CET] * Heinz joined [2019-12-15 19:55:04 CET] * rune joined [2019-12-15 19:55:13 CET] heinz [2019-12-15 19:55:20 CET] hello heinz [2019-12-15 19:57:15 CET] Hello Dave [2019-12-15 19:57:49 CET] you want to show me something. [2019-12-15 19:57:54 CET] Hi, I have my scope connectec [2019-12-15 19:58:05 CET] Does it work? [2019-12-15 19:58:09 CET] Yes [2019-12-15 19:58:22 CET] Just too many windows open at the start. [2019-12-15 19:58:29 CET] The ACE doesnt work though [2019-12-15 19:58:38 CET] Are the scans you have sent taken with this scope? [2019-12-15 19:58:50 CET] yes [2019-12-15 19:59:07 CET] What about the high voltage? [2019-12-15 19:59:34 CET] I cant explain it, all top-right (vcc) pins are 5V [2019-12-15 19:59:54 CET] The scans are taken with AC input. [2019-12-15 20:00:05 CET] Can you switch to DC? [2019-12-15 20:00:47 CET] i just took a screen shot again. 5V at pin 6, but that fuuny wave [2019-12-15 20:01:31 CET] at z9 most pins give a square wave [2019-12-15 20:02:05 CET] You have to start scanning at Z23/8, followed by Z9/3,4,5. [2019-12-15 20:02:16 CET] I have no seen such scans. [2019-12-15 20:02:24 CET] Please, send it. [2019-12-15 20:02:50 CET] not seen [2019-12-15 20:03:15 CET] I have not seen scans from the video jack. [2019-12-15 20:03:41 CET] Ok give me 2 minutes [2019-12-15 20:04:10 CET] Are there non square scans at some pins of Z9? [2019-12-15 20:04:24 CET] Cause you wrote "most pins" [2019-12-15 20:04:35 CET] If there are, I think 0v [2019-12-15 20:05:26 CET] 8=5v [2019-12-15 20:05:53 CET] 8=Vcc, o.k. [2019-12-15 20:06:03 CET] Eith [2019-12-15 20:06:13 CET] Either square, 0 or 5 V [2019-12-15 20:06:47 CET] And the frequencies? [2019-12-15 20:06:56 CET] Are they divided? [2019-12-15 20:07:09 CET] smaller and smaler, divided by two? [2019-12-15 20:07:46 CET] Show me the video signal. 1. timebase 10ms and 2. timebase 10µs [2019-12-15 20:08:18 CET] difficult to say, in sitting on the edge of my bed and mpouse etc keep falling off [2019-12-15 20:09:30 CET] mpouse? [2019-12-15 20:09:43 CET] pins 2, 3, 4 are roughly 2.5, 5, 8 divisions [2019-12-15 20:10:33 CET] 6 is 10? [2019-12-15 20:11:53 CET] Pin1 should be 3.5MHz (half of crystal frq), pin3 half of pin1, pin4 half of pin 3 etc. [2019-12-15 20:12:13 CET] What amplitude? [2019-12-15 20:12:30 CET] and are they squarelike? [2019-12-15 20:13:31 CET] Squaris, pin 1 is 4.4 divisions and about 4.2 volts [2019-12-15 20:13:32 CET] check the video signal. [2019-12-15 20:13:43 CET] How does it look like? [2019-12-15 20:14:16 CET] no back porch [2019-12-15 20:14:42 CET] at what frequency you don't see the backporche? [2019-12-15 20:15:14 CET] Send me picture of the video signal tomorrow. 10ms and 10µs. [2019-12-15 20:15:19 CET] 5 u/s division [2019-12-15 20:15:34 CET] 1 screen is 50 us [2019-12-15 20:16:09 CET] There should negative pulses fior 50µs [2019-12-15 20:16:22 CET] This would be the horizontal synchr. [2019-12-15 20:16:43 CET] i saw that on original board [2019-12-15 20:17:05 CET] What signals do you have at CPU/6? [2019-12-15 20:18:11 CET] i'll send what i SAW TONIGHT. There may be a back porch, but it is very small. [2019-12-15 20:19:01 CET] sent [2019-12-15 20:20:20 CET] Let me have a look, wait. [2019-12-15 20:21:14 CET] Signal at CPU/6 is unusuable. Could be the main reason for your faulty ACE. [2019-12-15 20:21:51 CET] And the signal goes to -2V. Impossible, if the scope inout is switched to DC. [2019-12-15 20:22:17 CET] scope is dc [2019-12-15 20:22:56 CET] remeber that 10v signal. pin 6 switches between that and the one tonight [2019-12-15 20:24:05 CET] Maybe its the electricity here. I get similar shape on the ZX81 with Farnell [2019-12-15 20:25:10 CET] Z9/3 looks crazy, I would expect a complete symmetry. [2019-12-15 20:26:09 CET] Wait til you see the signal on the ZX NU [2019-12-15 20:26:10 CET] You should find the same signal (as Z9/3) at R7 close to transistor 2 [2019-12-15 20:26:36 CET] Check the signal at the base of transistor 2. [2019-12-15 20:26:56 CET] And the signal at the collector (R8). [2019-12-15 20:27:50 CET] * Heinz quit (CGI:IRC 0.5.12) [2019-12-15 20:28:04 CET] * Heinz joined [2019-12-15 20:28:10 CET] I am back. [2019-12-15 20:28:17 CET] R 8 is thye same as Pin 6 [2019-12-15 20:28:26 CET] Signals at transistor2? [2019-12-15 20:29:24 CET] Right side of R7 is recognisable as a sine wave [2019-12-15 20:30:22 CET] Maybe transistor 2 is out of spec. I can use a ZX313? [2019-12-15 20:32:01 CET] Yes, you could and I did it. ZXT313. [2019-12-15 20:32:20 CET] I have sent you a picture with the clk signals, [2019-12-15 20:32:30 CET] inparticularly Z9/3. [2019-12-15 20:32:39 CET] looks completely symmetric. [2019-12-15 20:32:56 CET] I've lost the video now. Thanks, I'll look at it on Tuesday - got to go to work tomorrow [2019-12-15 20:33:14 CET] And also the clk signal of your NU does't look good. [2019-12-15 20:33:27 CET] faultyy probes? [2019-12-15 20:33:40 CET] no frequency compensatuion? [2019-12-15 20:33:46 CET] compensation [2019-12-15 20:34:16 CET] No, no, Z9/4 looks good. [2019-12-15 20:35:00 CET] maybe cheap probes? They are supposed to be 100Mhz [2019-12-15 20:35:43 CET] I have always had weird pin 6 waves. So yes, probably the probes [2019-12-15 20:35:59 CET] The signal Z9/4 is good. [2019-12-15 20:36:42 CET] The sigjnal Z9/5 seems to be good, but the time base is to short to measure the frequency. [2019-12-15 20:36:51 CET] Please, send it again. [2019-12-15 20:37:44 CET] I will measure Z9/3. Wait. [2019-12-15 20:41:21 CET] I kept the time base the same and the frequecy halves as I move down the pins [2019-12-15 20:42:04 CET] The signal is not symmetric. [2019-12-15 20:42:29 CET] Pleas show the signal at Z9/1 [2019-12-15 20:42:35 CET] Those thin waves? Every second time [2019-12-15 20:44:25 CET] now at 2 us [2019-12-15 20:45:00 CET] Very good signal. Vpp>4V, good. [2019-12-15 20:45:55 CET] I seem to get very thin spikes at pin 1 [2019-12-15 20:46:21 CET] Frequency = 1/5µs = 2MHz? Should be 3.5MHz. [2019-12-15 20:46:26 CET] sorry pin 1 [2019-12-15 20:46:39 CET] F*&^ Pin 2, i mean pin 2 [2019-12-15 20:47:01 CET] Pin 3 is similar to pin 1 except lower freq [2019-12-15 20:47:03 CET] Z9/2 = GND. [2019-12-15 20:47:18 CET] ok [2019-12-15 20:48:54 CET] pin 14 should be 5v? [2019-12-15 20:49:18 CET] Yes. [2019-12-15 20:49:42 CET] Multi meter says 5. Earth had slipped on scope [2019-12-15 20:50:11 CET] Shall we leave tonight and I'll change to ZX313 for tr2 tomorrow [2019-12-15 20:50:54 CET] Yes, I suppose that tr2 doesn't work properly. I had the same problem, hence I changed to ZXT313. [2019-12-15 20:51:22 CET] Good luck tomorrow. But also the pulses at Z9/3 look not o.k. [2019-12-15 20:51:23 CET] And you dont want a second edge connector now :) [2019-12-15 20:51:37 CET] Might be you should replace that chip. [2019-12-15 20:51:53 CET] OK, I have a spare [2019-12-15 20:52:02 CET] If you want I could send you the scans of all pins of Z9. [2019-12-15 20:52:25 CET] Fuirst try another transistor and have a look to CPU/6. [2019-12-15 20:52:28 CET] Please, it would help a lot [2019-12-15 20:52:38 CET] Cpmpare with my picture. [2019-12-15 20:52:43 CET] Im way out of my depth now. Drowning fast [2019-12-15 20:53:35 CET] compare [2019-12-15 20:53:44 CET] Y [2019-12-15 20:53:56 CET] Next Sunsda I will not be here. [2019-12-15 20:54:08 CET] OK, have a good time [2019-12-15 20:54:19 CET] Next chat Dec29th? [2019-12-15 20:54:23 CET] And a great christmas and new year [2019-12-15 20:54:36 CET] Yes, I'll be here [2019-12-15 20:54:36 CET] Same for you! [2019-12-15 20:54:40 CET] bye [2019-12-15 20:54:42 CET] Bye [2019-12-15 20:54:46 CET] * Heinz quit (CGI:IRC 0.5.12) [2019-12-15 20:54:49 CET] * rune quit (Leaving)