Maintenance
20220596G 111
Figure 5-3 AP21 PCB, component layout
• Remove the PROM from the socket by means
of the special extraction tool (p/n 44139806).
• Insert the tool by pressing the two grip pins
down into the two slots in the corners of the
socket.
• Squeeze the tool and pull out the PROM.
• When inserting new PROMS, make sure the
cut-off corner matches with the one in the
socket. Press it gently into the socket.
AP21 Control
Unit PROM
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