I recently discovered an error in the Lexmark E46x SM. The voltages listed when checking a "dead" machine etc. are incorrect. The problems lie in pins 4 and 7. According to the manual pin 4 & 7 should be 5V. The correct values are - pin 4-24V pin 7-0V.

Hope this helps. The following table are the voltages on CN201 (LVPS/HVPS) and J502 (Controller Board)

Pins Voltage-Measured Voltage-Manual
1 5 5
2 0 0
3 5 5
4 24 5
5 5 5
6 24 24
7 0 5
8 0 0
9 5 5
10 0 0
11 5 5
12 0 0
13 5 5
14 0 0
15 5 5
16 0 0
17 24 24
18 0 0
19 24 24
20 0 0