Shure U4D, Service Manual

Page: 16 / 47

Shure U4D Dual Diversity UHF Receiver
15 25D1062 (AG)
Disassembly and Assembly
Printed Circuit Board (PCB) Removal
Rf-Audio Board Removal
1. Tag and disconnect the cables attached to the pcbs. Standard
cable connections are shown in Figure 3.
2. Remove the screws and washers that secure the rf-audio pcb
to the receiver chassis, then lift the board out.
Display Board Removal
1. Remove the rf shield brace inside the receiver by removing
the three screws and washers securing it to the bottom of the
chassis.
2. Remove each display pcb by removing the two screws securing
the board to the back of the front chassis. Then pull the board
away from the chassis and lift the board out.
Monitor Board Removal
1. Perform the following steps after removing the front panel.
2. Remove the hexnuts that secure the stem of the monitor volume
control and the monitor output connector to the front chassis.
3. Pull the monitor board away from the chassis.
Power Supply Removal
1. Tag and disconnect the cables attached to the power supply.
2. Remove the screws and washers that secure the power supply to
the receiver chassis, then lift the power supply out.
U4D Assembly
1. Reinstall the rf–audio circuit boards and secure them with the
previously removed screws and washers.
2. Reinstall the power supply and secure it with the previously
removed screws and washers.
3. Reinstall the display pcbs and secure them with the previously
removed hexnuts and washers.
4. Reinstall the monitor circuit board and secure it to the chassis by
reinstalling the previously removed hexnuts and washers over
the volume control pot and output connector.
5. Reinstall the front panel and secure it to the front chassis with
the previously removed hexnuts and washers.
6. Reinstall the steel brace and secure it with the previously
removed screws and washers.
7. Reconnect all tagged wires and cables. Standard cable
connections are shown in Figure 3.
8. Reinstall the top cover, and secure it with the previously
removed screws and washers.