Finally I got some time
I made some tests.
1) volts on pin 11 of TEA2000 is 11,4V. I also gave my self 12+ and nothing change.
2) Pins 12 / 13 have correct MHz.
3) Taking directly video signal from pin 6 didn’t change anything. No color.
4) Pin 14 is High.
I am lost……..
Search found 119 matches
- Fri Nov 05, 2021 9:52 am
- Forum: Hardware
- Topic: Zx spectrum 128 +2 iss3 Z70500, problem with tr9
- Replies: 14
- Views: 812
- Tue Oct 05, 2021 8:25 am
- Forum: Hardware
- Topic: Zx spectrum 128 +2 iss3 Z70500, problem with tr9
- Replies: 14
- Views: 812
Re: Zx spectrum 128 +2 iss3 Z70500, problem with tr9
Thank you so much for your help! I have this pdf already printed. Just no much free time. I will post when I have news!
- Wed Sep 29, 2021 4:07 pm
- Forum: Hardware
- Topic: Zx spectrum 128 +2 iss3 Z70500, problem with tr9
- Replies: 14
- Views: 812
Re: Zx spectrum 128 +2 iss3 Z70500, problem with tr9
Yes. Two monitors. Monitors that working great with other spectrum computers.
- Wed Sep 29, 2021 2:50 pm
- Forum: Hardware
- Topic: Zx spectrum 128 +2 iss3 Z70500, problem with tr9
- Replies: 14
- Views: 812
Re: Zx spectrum 128 +2 iss3 Z70500, problem with tr9
I have the same scope with you! Also all my measurements are about the same with you. I don’t understand why I don’t have a color. I have made an av mod by get the signal from rgb connector. Everything is good but black and white picture only… I have test also 2 more tea2000. Same results.
- Mon Sep 27, 2021 9:53 pm
- Forum: Hardware
- Topic: Zx spectrum 128 +2 iss3 Z70500, problem with tr9
- Replies: 14
- Views: 812
Re: Zx spectrum 128 +2 iss3 Z70500, problem with tr9
Thank you so much!!!
I will report back!
I will report back!
- Sun Sep 26, 2021 7:04 am
- Forum: Hardware
- Topic: Zx spectrum 128 +2 iss3 Z70500, problem with tr9
- Replies: 14
- Views: 812
Re: Zx spectrum 128 +2 iss3 Z70500, problem with tr9
Hello and thank you for your answer. If it is no problem i want for all (not the voltage pins ofc) cause I want to compare with my results.
Thank you very much.
Thank you very much.
- Fri Sep 17, 2021 12:15 pm
- Forum: Hardware
- Topic: Zx spectrum 128 +2 iss3 Z70500, problem with tr9
- Replies: 14
- Views: 812
Re: Zx spectrum 128 +2 iss3 Z70500, problem with tr9
Hello all.
Anyone have measurements of TEA2000 ic with oscilloscope?
With new ic still have no colors.
Anyone have measurements of TEA2000 ic with oscilloscope?
With new ic still have no colors.
- Thu Sep 16, 2021 9:18 am
- Forum: Hardware
- Topic: Zx spectrum 128 +2 iss3 Z70500, problem with tr9
- Replies: 14
- Views: 812
Re: Zx spectrum 128 +2 iss3 Z70500, problem with tr9
The problem was in 12v rail, that was short to ground and blows TR9. The solution made by replacing capacitors C6 and C41. Measurements on this two capacitors shows the one as resistor and the other one as diode. After that replacements voltages are ok. The only problem now is that TEA2000 color enc...
- Mon Sep 06, 2021 6:16 pm
- Forum: Hardware
- Topic: Zx spectrum 128 +2 iss3 Z70500, problem with tr9
- Replies: 14
- Views: 812
Zx spectrum 128 +2 iss3 Z70500, problem with tr9
Hello all!
I have here a zx 128 +2 Issue3 Z70500 motherboard that didn’t have 12v. I measure TR9 ztx650 and it was faulty. I replace it with ztx651 but keeps burn it. I see in my desk power supply that pulls almost 2A when i connect the motherboard. I replace also tr8 with ztx751.
Any help please?
I have here a zx 128 +2 Issue3 Z70500 motherboard that didn’t have 12v. I measure TR9 ztx650 and it was faulty. I replace it with ztx651 but keeps burn it. I see in my desk power supply that pulls almost 2A when i connect the motherboard. I replace also tr8 with ztx751.
Any help please?
- Mon Dec 21, 2020 10:42 am
- Forum: Hardware
- Topic: Arduino 4116 tester FINAL! Free Gerbers.
- Replies: 2
- Views: 5794
- Thu Nov 26, 2020 7:54 am
- Forum: Hardware
- Topic: Arduino 4116 tester FINAL! Free Gerbers.
- Replies: 2
- Views: 5794
- Wed Nov 25, 2020 11:40 am
- Forum: Hardware
- Topic: Arduino 4116 Dram tester with an extrenal help.
- Replies: 20
- Views: 14242
- Wed Nov 25, 2020 11:39 am
- Forum: Hardware
- Topic: Arduino 4116 tester FINAL! Free Gerbers.
- Replies: 2
- Views: 5794
Arduino 4116 tester FINAL! Free Gerbers.
Hello! Here is my final 4116 tester. You can have all files from the link bellow. Including: Part List, gerber files, arduino code, driver for clone arduino Testing time: 11sec~ You can power the arduino from 9v dc power supply or from arduino usb (9v dc from power supply preferred) Download: http:/...
- Thu Sep 03, 2020 1:43 pm
- Forum: Hardware
- Topic: Arduino 4116 Dram tester with an extrenal help.
- Replies: 20
- Views: 14242
Re: Arduino 4116 Dram tester with an extrenal help.
There was some errors in the prototype PCB. I did some emergency cable jumpers to solve the problem. Now it is ready and 100% in working order. Sadly I need to order some new pcb’s for the final test. This tester work also with 5 volts, through the Arduino usb plug. This future make it a bit portabl...
- Sun Jul 26, 2020 2:33 am
- Forum: Hardware
- Topic: Arduino 4116 Dram tester with an extrenal help.
- Replies: 20
- Views: 14242
Re: Arduino 4116 Dram tester with an extrenal help.
Waiting the damn inductors to arrive....
- Mon Jul 06, 2020 10:16 pm
- Forum: Hardware
- Topic: Arduino 4116 Dram tester with an extrenal help.
- Replies: 20
- Views: 14242
Re: Arduino 4116 Dram tester with an extrenal help.
Almost done!
I am waiting some more components to arrive.
I am waiting some more components to arrive.
- Sat Jun 27, 2020 7:51 pm
- Forum: Hardware
- Topic: The Startek DT-90 Project.
- Replies: 14
- Views: 2360
Re: The Startek DT-90 Project.
Here are the two Pal's i need to find or replace with Gal's: AMD 16L8B-2 PAL & AMD 16R4A-4 PAL.
If anyone have them in stock or can help with replacement ones, please post here.
Thank you
If anyone have them in stock or can help with replacement ones, please post here.
Thank you
- Fri Jun 26, 2020 12:00 pm
- Forum: Hardware
- Topic: The Startek DT-90 Project.
- Replies: 14
- Views: 2360
Re: The Startek DT-90 Project.
The first PCB’s just arrived. A long trip just started till the end. Need to check the board compared to schematic and get the components.
Anyone have a PAL programmer?
Anyone have a PAL programmer?
- Sun May 31, 2020 8:41 am
- Forum: Hardware
- Topic: Arduino 4116 Dram tester with an extrenal help.
- Replies: 20
- Views: 14242
Re: Arduino 4116 Dram tester with an extrenal help.
The prototype pcb's has not yet arrived, but i decided to do some changes for the final version. I reduced the board size. From 12cm x 11cm it was, it came to be a little less than 10cm x 10cm. This is because the cost of its construction is significantly reduced, but also for reasons of space savin...
- Sat May 16, 2020 10:07 pm
- Forum: Hardware
- Topic: The Startek DT-90 Project.
- Replies: 14
- Views: 2360
Re: The Startek DT-90 Project.
Τhe actual photos are found but are from a later version. https://i.postimg.cc/YL0bCDX2/image1.jpg https://i.postimg.cc/wy0wHYQb/image0.jpg From my research, the only person i know who has one Startek DT-90, is one guy from the USA who repairs arcade machines. Is the same guy if i am not mistaken wh...
- Fri May 15, 2020 12:35 pm
- Forum: Hardware
- Topic: The Startek DT-90 Project.
- Replies: 14
- Views: 2360
Re: The Startek DT-90 Project.
I always check the schematic but keep in mind that do checks on a copy pcb from the "pcb design program" and the schematic it is a pain. I am about 99% sure that the board i make is a good copy and i order some to check them. When they come i put the pcb and schematic front of me and i che...
- Fri May 15, 2020 6:54 am
- Forum: Hardware
- Topic: The Startek DT-90 Project.
- Replies: 14
- Views: 2360
Re: The Startek DT-90 Project.
Good morning.
The purple pic it is the top view and only.
More later cause I am at work and from mobile.
The purple pic it is the top view and only.
More later cause I am at work and from mobile.
- Thu May 14, 2020 10:33 am
- Forum: Hardware
- Topic: The Startek DT-90 Project.
- Replies: 14
- Views: 2360
Re: The Startek DT-90 Project.
Board now finished.
I need to do double checks before the printing process. It is not really matter if this try fail. We always have a second chance.
It was a pleasure for me to recreate that board.
We will see...
I need to do double checks before the printing process. It is not really matter if this try fail. We always have a second chance.
It was a pleasure for me to recreate that board.
We will see...
- Wed May 13, 2020 10:26 pm
- Forum: Hardware
- Topic: The Startek DT-90 Project.
- Replies: 14
- Views: 2360
Re: The Startek DT-90 Project.
I would be very happy if somehow find a clear photo from both pcb sides, even with the components. That old and not so well pcb prints from the magazine makes my project a bit tricky. What i mean by that? If you look at the pcb mask, the one that have the components layout, LED4 (green/red) with the...
- Wed May 13, 2020 4:57 am
- Forum: Hardware
- Topic: The Startek DT-90 Project.
- Replies: 14
- Views: 2360
Re: The Startek DT-90 Project.
Thank you for your great tutorial’s. I use Kicad. To be honest I start using Kicad in my 4116 tester, I don’t know if you saw it in hardware section. About Pal’s the code is available too and this ic’s can be found. I don’t have Pal programmer but when this time come and all I need is that, I ask fo...