HEIDENHAIN TNC 407 (243 020) Service Manual - Manual (Page 108)

SERVICE MANUAL TNC
Issue:
01.09.1995
P a g e 8 9
19.
19.1
19.1.1
Exchange Instructions
General Remarks
Equipment Required
I external data medium, e.g. FE or personal computer with connecting cable
1 tool set (screwdriver, socket wrench etc.)
1 MOS protection device (only required for exchanging boards or EPROMs)
19.12 MOS Protection
If the processor board, the PLC and graphics board, the CLP boards or EPROMs are to be exchanged, a MOS
protection is definitely required, as otherwise MOS components on the boards or EPROMs may be destroyed.
Note:
Avoid any unprotected handling or contact of the boards or EPROMs with statically charged objects
(packaging material, storage etc.).
MOS Protection
Potential compensating line
with protective
mat lays on the machine table
Bracelet
Software Compatibility
Exchange units (complete logic unit) are generally supplied with the latest software version. Exchange boards
however, are always supplied without software and without software protection module.
For this reason, the EPROMs and the software enable module of the defective board must be inserted into
the exchange board at site (see sec. 19.9). Before sending us exchange boards for repair, always remove the
EPROMs and the software enable module.