Avery Dennison 686 HT, User Manual

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Users Manual Model 686 / 686 HT Appendix B
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Thermal Control Board P/N 371105NE
U 36
U 23 U 21 U 4 U 3
U 18 U 19 U 20
U 22
THERMAL CONTROL BOARD , Upgradeable software I.C.'s include U3, U4, U18 - U23, U36.
PLCC CHIPS align angled corner of chip with angled corner of socket that is counter clockwise to the arrow.
DIP CHIPS align notch on chip with the notch on the socket (U3 & U4 chips are four pins smaller than U3 & U4 sockets, position chips towards top of socket so
that the unused socket pins are at the bottom closest to the notch.
(Use chip removal tool p/n. 351156 for square I.C.'s)