Measure input and output voltage. it should have 5v output voltage. Try to lift from pcb littlebit. I had similar problem, and problem was bad pcb design.
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15th August, 2014, 10:00 AM #16Member
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The Following User Says Thank You to pecirepi For This Useful Post:
Fec001 (15th August, 2014)
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15th August, 2014, 11:46 AM #17DK Veteran
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Max232 was getting hotter with the regulator too. Now change regulator and max232 it seems ok now, no hot units but pc still not found programmer. I read something about serial cable problem. I tried with standard cable where pin 1 go to pin 1 and so on. Should I use another pinout?
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15th August, 2014, 12:00 PM #18DK Veteran
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I think U10 is fine.
Originally Posted by ecupro
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15th August, 2014, 02:09 PM #19DK Veteran
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That in red circle is resistor. Originally Posted by Fec001
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15th August, 2014, 02:14 PM #20DK Veteran
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I mean about this ic, it seems burned.
1.jpg
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15th August, 2014, 02:36 PM #21DK Veteran
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No, it looks fine. Just bad picture quality
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16th August, 2014, 05:42 PM #22DK Veteran
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Finally Pc recognize programmer. It was RS232 cable fault. Other problem I still cannot write flash memory. It writes eprom content perfectly.
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16th August, 2014, 08:57 PM #23Banned
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chek your cable first see at etl port com you can see where is the prob you must swap pin in com port cable
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16th August, 2014, 11:34 PM #24DK Veteran
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But it can write eeprom content of MCU. Don't believe it's still cable problem. Monday will post pictures abou problem
Last edited by Fec001; 16th August, 2014 at 11:37 PM.
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18th August, 2014, 11:44 AM #25DK Veteran
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is the 4J74Y exchangeable with 2J74Y? Becuase I have 2J74Y what can be programable flash/eprom with ETL. 4J74Y flash cannot program with ETL. Maybe MCU is faulty....
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18th August, 2014, 02:07 PM #26Banned
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yes can do, 2j74y always giving problem.
try heating up the mcu and read
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10th December, 2015, 10:01 PM #27Top Poster
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Hey guys, where can I purchase this programmer?
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27th February, 2016, 08:43 AM #28Top Poster
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I finally got ETL 908 Clone and I have problem with 4J74Y too. Programmer can't read it. With other masks everything is fine. maybe its a hardware problem? maybe faulty resistor or condensator?
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27th February, 2016, 12:51 PM #29DK Veteran
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4J74Y no problem...
https://www.youtube.com/watch?v=WYRB_2EcpWYYou'll need pictures from all sides mate ....
? PremierD
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22nd September, 2016, 12:38 PM #30Top Poster
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Hey guys so I bought exactly same ETL programmer and now I get same error on both programmers:
"Reset line must be in high state"
Both programmers say this.
on two same chips(2J74Y and 4J74Y) other chips are read perfectly.
tried on other PCs.
tried with different cables.
any solution?
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