Citizen COMPACT CT-S310II Service Manual page 13

Remove "SCREW, BHT (ST), M3.0  6" that fastens "FRAME, BOTTOM-03" and "PLATE, IF-03".
Remove two "LOCK SCREW" from the right and left of the serial connector.
Turn "PLATE, IF-03" toward you and pull it out upwardly.
Remove three "SCREW, TP (ST), M3.0  5" that fasten "SA, MAIN PCB".
Note that one of those screws is secured with "COVER, DR CONNECTOR-03".
SCREW, BHT (ST), M3.0  6
BOSS
DK LOCK SCREW
<Precaution at reassembly>
When attaching "PLATE, IF-03", align the bosses at "FRAME,
BOTTOM-03" with the holes at "PLATE, IF-03".
Check the positions of the serial, DK and USB connectors.
Remove two "SCREW, FHT (ST), M3.0  8" that fasten "FRAME, BOTTOM-03" and the AC inlet on
"PWB (MAIN_PCB30)". Move the AC inlet outwardly to detach it from "FRAME, BOTTOM-03".
USB
SCREW, FHT (ST), M3.0  8
AC inlet
PLATE, IF-03
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CT-S310II Series Service Manual
COVER, DR
CONNECTOR-03
SCREW, TP (ST), M3.0  5