user manual

MVME177 Module Installation Instructions

2-17

the polyswitch. When using the MVME712M module, the yellow

LED (DS1) on the MVME712M front panel lights when LAN power

is available, indicating that the polyswitch is good.

The MVME177 provides SCSI terminator power through a diode

and a 1 amp polyswitch F1 located on the P2 Adapter Board. If the

polyswitch is blown (i.e., open), the SCSI devices may not operate

or may function erratically. When the P2 Adapter Board is used

with an MVME712M and the SCSI bus is connected to the

MVME712M, the green LED (DS2) on the MVME712M front panel

lights when there is SCSI terminator power. If the LED flickers

during SCSI bus operation, the polyswitch should be checked.