hi,
my ML 38s preamp damage by wrong voltage, i check it the line part is good, problem is on logic control, the logic have three programable ic, if once damage must cant power on, one is cpu(mc68hc11a) one is eprom 27c512, one is peel18cv8, the problem is on peel18cv8 because its very hot, and cannot read data use my universal programmer, 27c512 is ok and have read the data, the cpu i check ref voltage also is ok
now i have new peel18cv8 but have not the inside data, please help me where can get the data, i have ML 332 also use peel18cv8 to logic control, i use 332 18cv8 in 38s, the panel have respond but not proper work, i think 18cv8 is differ version because the label code is differ
please mail me if someone have 38 or 380 18cv8 data code, i can share 38s eprom data and 332 18cv8 data,
thank you vey much
steven
my ML 38s preamp damage by wrong voltage, i check it the line part is good, problem is on logic control, the logic have three programable ic, if once damage must cant power on, one is cpu(mc68hc11a) one is eprom 27c512, one is peel18cv8, the problem is on peel18cv8 because its very hot, and cannot read data use my universal programmer, 27c512 is ok and have read the data, the cpu i check ref voltage also is ok
now i have new peel18cv8 but have not the inside data, please help me where can get the data, i have ML 332 also use peel18cv8 to logic control, i use 332 18cv8 in 38s, the panel have respond but not proper work, i think 18cv8 is differ version because the label code is differ
please mail me if someone have 38 or 380 18cv8 data code, i can share 38s eprom data and 332 18cv8 data,
thank you vey much
steven
Oh!..this goes killing a lot of things
if regulators gone, then a lot of chips and microprocessors gone too.
regards,
Carlos
if regulators gone, then a lot of chips and microprocessors gone too.
regards,
Carlos
Re: Oh!..this goes killing a lot of things
the regulators is ok, all parts seems is ok only 18cv8 damage
destroyer X said:
the regulators is ok, all parts seems is ok only 18cv8 damage
The only way youre going to be able to get this data is to convince someone with the same unit to pull the chip and read it out.
Alternatively see if the manufacturer will help, but their answer will likely be "no".
Alternatively see if the manufacturer will help, but their answer will likely be "no".
The part you're referring too, the 18cv8 is a PAL, not an EPROM or ROM, used to complete the logic interface, it is used to remove data processing from this rather old and slow processor the 68HC11. It is used for example to read the optical encoder uses as volume control interface.
It would be impossible to get this PAL IC, I was never able to fix a damaged PCB that has this problem. I tried on two nice 38S PCB that P.Daniel has but with no luck. Without this PAL IC, the board is useless. Sorry.
SB
It would be impossible to get this PAL IC, I was never able to fix a damaged PCB that has this problem. I tried on two nice 38S PCB that P.Daniel has but with no luck. Without this PAL IC, the board is useless. Sorry.
SB
hi, Algar_emiAlgar_emi said:
as i know, 18cv8 is "PROGRAMMABLE ELECTRICALLY ERASABLE LOGIC DEVICES"
http://hk.mouser.com/Cart/AdditionalProductInfo.aspx?part=5-0505-48
also it can be read write data use my universal programmer, i have test easy my ml332 18cv8 then write it again, its ok, Mr Algar_emi, how do you think if i copy another 38s 18cv8 data in my new 18cv8, will it be work?
thx
oh...i check the 18cv8 datasheet, it have a eeprom security bit, if active will cannot read data, but i can read ture data in my ml332 18cv8, that mean ml332 18cv8 is inactive security bit? Algar_emi, have you try raed the good one ml38 18cv8? may you help me try to read? maybe all ml product not protect the 18cv8
Yes, the security bit. This is why I never tried to unsolder this IC, afraid that I could damage it and/or the PCB (those ML38 PCB are very tricky to work with, the pin's pads are so thin, they can be easily damaged), and not be able to read it at the end.
cmkc said:
In China, We Trust! (i.e. to reverse Engineer anything and ability to copy everything).
But Congrats to you for able to do a good job repairing ML38!
I know this is an old thread but I have a failing 380s that I believe is starting to have a problem with the PEEL 18cv8. Does anyone have the code off of this chip or know if the security bit is set or not?
PM sent. Also have you looked at the 68HC uP? Do you know if there is any custom config in the processor. When I get some time I will investigate. Trying to keep my 380s alive as long as possible.