IBM 4247 Maintenance Information page 397

For an SCS-only printer: An SCS-only printer is identified by a label on the microcode module S1 that reads
KxTSAvvv. If you are installing a new level (short) attachment card [182 mm (7.2 in.) long] which is at an
attachment microcode level below 4.03 (that is, the label on microcode module S1 reads KxTSA402 or lower),
you must install a complete, new microcode kit. This kit includes modules U2 and U54 on the main logic
board, and module S1 on the attachment card.
Attention: When using module extractor PN 73G5523, follow these steps to avoid cracking or damaging the
plastic sockets.
a. Insert the C-shaped end of the tool into one of the module socket extraction slots.
b. Hold the tool perpendicular to the module and pull upward to loosen it from the socket.
c. Repeat the previous 2 steps, using the extraction slot in the opposite corner, until the module lifts out of
the socket.
7. When re-installing, verify that the microcode module S1 is properly oriented and plugged into the socket. Use
Figure 129 on page 398 as a guide.
- or -
For the Level 2 (short) attachment card, use the orientation marks to help you position the microcode module
S1 in the module socket. See Figure 130 on page 398.
Attention: Incorrect orientation will damage the attachment module and can damage the card!
Note: Some module sockets are deeper than the module. To ensure proper contact, insert the module into
the socket only until it is flush (level) with the top of the socket.
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Chapter 5. Removals and Adjustments