Analog (power supply) board variations in the Mac Classic


Scott Baret wrote in the Mac Classics forum of the 68Kmla.net Web site at http://68kmla.net/forums/

"The Compact Mac CRT Guide", posted by Scott Baret, 29 May 2007


CONNECTOR TYPE A vs CONNECTOR TYPE B

I term them A and B after the analog boards they are used with. Connector Type A is clear and relatively boxy. It fits itself into another clear plastic connector on the analog board. To remove it, one must hold in on a tab on the side of the connector. Connector Type B, on the other hand, is white and significantly smaller. The connector isn't bulky and is slightly rounded around the edges. It has four holes on its end and fits over four pins.

These two display types are NOT INTERCHANGABLE.

[The document says the 128K, 512K, Plus, SE and SE/30 used the "type A" connector, the Classic II the "type B", but the Classic may use EITHER.]

ANALOG BOARDS IN MAC CLASSICS

The analog board design for the Macintosh Classic changed sometime around the spring of 1991. The original is referred to as Revision A on most parts lists. It used Connector Type A.... Sometime around the spring of 1991, Classics began to roll off the assembly line with Revision B boards installed. These persisted throughout the Classic II series and were produced until the demise of the line in 1993.