The information on this page is meant to help you troubleshoot encountered problems. Please try if the
items below do solve your problem. Always make sure you have the latest software version installed
on your PC. The latest software can be downloaded from this website in the
EPP-3 software section.
1. I always get error messages when the PC program starts
2. Any action (read, check, write, etc.) to the programmer fails
The PC software can only be used when the EPP-3 USB interface has completely been detected and installed
by the operating system. Therefor the start up sequence is as follows:
|Q:||I keep getting the message "Error 49 USB <any action> Command Fail"|
|A:||It is not needed to turn off the power of the programmer to change a component in the ZIF socket. When the Busy LED is OFF, and the PC software is not communicating with the programmer, any IC in the ZIF socket can safely be removed or replaced.|
|Q:||I want to program a 27Cxxx device but I can't find it in the device list|
|A:||Select 27C General Type as brand in the device selection menu. After this select the device which matches the size and the programming voltage of your component. The programming voltage (Vpp) can be found in the datasheet of the IC.|
|Q:||What is the basic operation of the EPP-3 PC software?|
Basically operation is reasonably simple. If you look well you will notice a line with arrows
in the "Source" part of the screen. In this screen you have to perform your first series of
The lower part of the screen has controls the several programming process and options which may vary depending per device type:
You can also perform a sequence of actions by clicking the Play [>] icon. All programming actions of which the select box have been enabled will be performed.
|Q:||The above items do not solve my problem, what should I do now?|
If the above does not solve your problem, please send an e-mail to
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