Lexicon 960L Service Manual page 19

NOTE: The following voltage tests are to insure that the connectors are plugged into the NLX
backplane and that power is being properly distributed to the other devices. This may also help in
determining whether or not the devices themselves are defective.
To gain easier access to the test points called out in the following tests, you will want to turn over the
mainframe of the 960L so the bottom faces up or rest it on its side.
All power connections to the backplane, Hard Drive, CD ROM Drive and 3.5" Floppy Drive have the same
colored wiring code.
Color Voltage Range
Yellow + 12. volts DC ±.6
Black Ground
Red + 5 volts DC ±.25
NLX Backplane Connector J9 Voltage Level Test:
1. Locate the power connector J9 on the rear backplane.
2. Measure the voltages on the connector with your DMM leads.
3. Place the DMM ground lead on the Black wire connector and the DMM plus lead on the Yellow wire
connector and verify the voltage is +12 VDC (± .6 VDC).
4. Place the DMM ground lead on the Black wire connector and the DMM plus lead on the Red wire
connector and verify the voltage is + 5 VDC (± .25 VDC).
3.5" Floppy Drive Connector:
1. Locate the power connector on the back of 3.5" Floppy Drive.
2. With your DMM leads measure the voltages on the connector.
Lexicon
4-3