Setting voltages on a 08BH188AT processor

How to set voltages on a 188 processor with M1 terminal strip

Note: For this version of the 188 processor, 12.80V DC is necessary. The 5V DC can be roughly 5V.  The board creates the 5 VDC from the 12 volt supply.  So, you don't have to worry about setting the 5 volt supply at the power supply.   Always check voltage at the processor board. Go to terminal strip M1 & put your red meter led on terminal 6 & black meter led on terminal 4. You should read 12.80V DC between terminals 6 and 4 (Fig1). If your voltage is not correct, adjust the power supply. Move your red meter lead to pin 3. You should read about 5V DC between terminals 3 and 4 (Fig2). After all voltages have been checked turn the machine off, wait 10 seconds, then power back on. If you cannot produce proper voltage from the power supply, replace the power supply. This document is for processors with the part numbers of 08BH188AT, 08BH188BT, 08BH188AXT, & 08BH188BXT.

Fig1 - Measuring for 12.30V DC Fig2 - Measuring for 5V DC

How to set voltages on a 188 processor with M1 terminal plug

Note: For this version of the 188 processor, 5.10V DC is supplied by the power supply necessary and the setting on the power supply is critical for 5VDC.  The 12V DC can be roughly 12V.   Always check voltage at the processor board. Go to plug M1 & put your red meter lead on pin 3 & your black meter lead on pin 4. You should read 5.10V DC between pins 3 and 4 (Fig3). If your voltage is not correct, adjust the power supply. Move your red meter lead to pin 6. You should read about 12V DC between pins 6 and 4 (Fig4). After all voltages have been checked turn the machine off, wait 10 seconds, then power back on. If you cannot produce proper voltage from the power supply, replace the power supply. This document is for processors with the part numbers of 08BH18EPDT, 08BH18EPT, 08BH18EP1T & 08BH18EPYT.

Fig3 - Measuring for 5.10V DC Fig4 - Measuring for 12V DC

Voltage Settings: Why 12.80V and 5.10V?

Milnor sets voltages high to account for voltage drop from the on-board protection circuitry which requires 12.80V or  5.10V on its respective boards.