Electronics > Repair
CF7000 coin changer control board
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brauliochi:
Hi, my name is Braulio, I repair http://www.meigroup.com/australia_nz/vending/vending_products/coin_mechs/mei-cashflow-cf7000/, and have a questions, they control board sometimes burn's, and discover that quit the flash chip fixit, dont burn a transistor pnp protection, my questions is... if I change the flash chip from another control board, they should works? they have a id protections?
the MCU is M308B8SGP
the flash chip is M29W800DT
the RAM is CY62146EV30
MEI's dont provide the squematics
I read succesfull a flash chip with a TNM5000 programmer, but i dont sure if a buy a new one flash chip and flashed, will work with this, i never work with a renesas mcu

thm_w:
This is just a guess, but I doubt they would secure it in that way. M308B8SGP has no storage memory, must run off the flash only. A new flash chip is $1, so it seems worth the time.
I don't have a flash programmer.

Whats the pnp protection? Does it seem like the MCU and RAM is not damaged by whatever burned the flash?
brauliochi:
Hi thm_w sorry for my late reply, I was sick with hepatitis A, apparently very commun in my third world country  ;) , I was out 1 month, but now i fine, the pnp protection is a transistor located in the second power supply (3.3V output) of the board, if there is a short circuit in the IC's powered with 3.3V, this transistor blowout, working like fuse, if i desolder the flash, and change the transistor, turn on ok, the short circuit is gone, but now dont do it anything obviously, I already change the flash and turn on all ok, but a error a new error appear, "error in sensor coin"
I think that need a new calibration with the software, but dont communicated with the computer!! now i'm stuck, I share a squematic that i try to do, only following traces and searching google ic's marks
you need install circuit maker
http://circuitmaker.com/Projects/ProjectAccessDenied/braulio-chi/Control-Board-CF-7000
send me a request permission
thm_w:
Heres a larger photo if anyone is curious about the parts. Since sticker is on the flash they probably pre-program it at an earlier stage.
Will send board soon.
brauliochi:
Thanks for the photo, much much better, I do not know that it can be causing the flash to burn, since the other components have no fault, it is often only the flash
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