After Installing The New Power Amplifier; Power Supply; Physical Replacement Of The Power Supply - Motorola PDR 3500 Basic Service Manual

After Installing the New
Power Amplifier

Power Supply

Physical Replacement of
the Power Supply
68P81093C75-O
5. Reconnect all four cables removed in Step 4. The ribbon cable
connector is keyed so it cannot be attached incorrectly.
Remember to reattach the metal clip over the ribbon cable
connector.
6. Take the sheet of black thermal conductive film that was
between the old PA and the chassis and place it on the new PA.
7. Place the PA in the chassis and line up the screw holes in the PA
and the thermal film with the holes in the top panel of the
chassis. (It may be useful to insert a pencil, pen, or small
screwdriver through the screw holes in the top panel to aid in
aligning the holes in the conductive film with those in the PA.)
8. While holding the PA with one hand, start two or more Phillips
screws in the top panel to hold the PA in place. Insert the
remaining screws and tighten all four.
9. Place the chassis back in the case and secure it with the eight
Phillips screws around the top panel.
Perform the following alignment procedures as described in the RSS
User's Guide (part number 68P81085E35), or the Setup and
Connections section of this manual, or both.
• Power Output
1. Turn off the station's power by unplugging the AC and DC
power cords from the top panel.
2. Detach the backplane from the chassis as described in Steps 1
through 7 of the Backplane subsection of "Module
Replacement."
3. Remove the four Phillips screws holding the Power Supply to
the top panel of the chassis. Pull the PS out of the chassis.
4. Disconnect all five wires from the Power Supply.
5. Reconnect the wires to the new Power Supply as follows:
• Green to GND
• Orange to the "H" INPUT
• Brown to the "N" INPUT
• White to the "POS" OUTPUT
• Black to the "NEG" OUTPUT.
6. While holding the PS with one hand, start two or more Phillips
screws in the top panel to hold the Power Supply in place. Insert
the remaining screws and tighten all four.
September 27, 2000 9-33