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Some A3000s were shipped from Commodore with the termination power
diode soldered on backwards. To complicate the matter, the diode
silkscreen may also be done incorrectly. As a result, you may experience
troubles with terminating the bus properly.
One way to check for termination power is to use a voltmeter or
DMM to read the voltage off of pin 25 on the external SCSI port using the
shield for ground. There should be 5V there.
The correct orientation for the diode is with the cathode of D800 (stripe
side) to be connected to pin 25 of the external SCSI port. The anode
(non-stripe side) should be connected to the system 5V supply.