Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 789)

Section 15B
Replacement Procedures
15B-33
7. Remove the 8 mounting screws along the top and bottom edges of the
rotary MTB panel.
+12 V DC
GND CN51 CN52
OP11
(out)
OP12
(in)
I/O ring fault indicator
JP1
JP2
C26 C27
8. Replace the rotary MTB panel with a new rotary MTB panel.
To replace the push-button MTB panel:
1. Turn OFF all power to the control.
ATTENTION: To guard against electrical shock hazards, never
make connections or disconnections at the AC distribution
network unless the main AC disconnect switch is open and
locked.
2. Disconnect the cable running from the operator panel power supply to
the power supply terminals on the push-button MTB panel I/O
module.
3. Disconnect the I/O interface cable running from the connector
(CN16F) on the sub processor board to the push-button MTB panel.
4. Disconnect the cable running from the E-Stop terminals of terminal
block BT-20 to the E-Stop terminal block BT01 on the motherboard.
5. Disconnect the cable running from the power ON/OFF terminals of
terminal block BT-20 to the ON SW/OFF SW terminals on the main
power supply.
6. Disconnect the fiber optic cables from the MTB panel I/O module.
15B.19
Replacing the Push-button
MTB Panel