HEIDENHAIN TNC 407 (243 020) Service Manual - Manual (Page 16)

HEIDENHAIN
31-O
Kundendienst
SERVICE MANUAL TNC
01.09.1995
Page 10
-NC 407:
I A CRC-sum main processor EPROM CHIP
CRC-sum main processor EPROM CHIP
I D CRC-sum PLC chip
I X Check sum calculation
-NC
YA CRC-sum main processor EPROM CHIP
CRC-sum main processor EPROM CHIP
YD CRC-sum PLC chip
YE CRC-sum Gem chip CHIP 7
YR CRC-sum CLP boot chip
I X Check sum calculation
‘NC TNC 425:
YA CRC-sum main processor EPROM CHIP
YB CRC-sum main processor EPROM CHIP
CRC-sum geometry processor EPROM CHIP
YD CRC-sum PLC chip
YE CRC-sum Gem chip CHIP 7
YR CRC-sum CLP boot chip
I X Check sum calculation
Y CPU number
1 main processor
2 geometry processor
3 =
processor
CRC Cyclic Redundancy Check
If the message “CHECK SUM ERROR comes up repeatedly, send the
complete LOGIC
UNIT to
for repair. Please
indicate the check sum error.