HEIDENHAIN TNC 415 (259 9x0) Service Manual - Manual (Page 153)

SERVICE MANUAL TNC 415B/425
Page 148
Issue: 20.08.95
21. Exchange Instructions
21.1 Important Notes
*
Observe the safety instructions!
21.1.1 Required Equipment
1 external data medium, e.g. FE 401/B or PC with connecting cable
1 tool set (screw driver, socket wrench etc.)
1 MOS protection device (only required for exchanging boards or EPROMs)
21.1.2 MOS Protection
If the processor board, the PLC graphics board, the CLP boards or EPROMs are to be exchanged, a MOS
protection is definitely required, since otherwise MOS components on the boards or the EPROMs may be
destroyed.
*
Caution!
Avoid any unprotected handling of the boards or EPROMs with statically charged objects
(packaging material, storage etc.).
MOS Protection
21.1.3 Software Compatibility
Exchange units (LOGIC UNIT) are always supplied with the most recent software version. Exchange boards,
however, are delivered without software and without software enable module. Therefore, the EPROMs
and the software enable module of the defective board must be inserted into the exchange board at site.
Always remove the EPROMs and the software enable module before sending us boards for repair!)
MOS
protection mat
bracelet
GROUND
(e.g. protective wire socket)
not required, if the MOS protection
mat lays on the machine table
potential compensating line
with protective resistor
R = 1 M
Ω