Assembly Removal and Replacement, MS203xC 7-11 Replacing Main Keypad Components – 3-61362,
MS20xxC MM PN: 10580-00307 Rev. D 7-15
Removing Main Keypad Rubber Membrane
9. Protecting the Speaker wires, start at the bottom of the Main Keypad Rubber Membrane and lift it up.
10. Hold the edge of the Speaker with one hand and remove the Membrane from one side and then remove
the Membrane from the other side.
11. Again starting at the bottom, lay in the replacement Membrane starting at the top of the keypad area.
12. At the top, lift up the left edge of the Speaker and lay in the Membrane.
13. Again at the top, lift up the right edge of the Speaker and lay in the Membrane.
14. When complete, the Speaker should sit ON TOP of the Membrane.
15. Make sure that the Main Menu Keypad ribbon cable is still securely connected.
16. If you are not replacing the Main Keypad PCB, then skip ahead to “Installing Main Keypad Bezel:”
on page 7-15 and replace the Keypad Bezel.
Removing Main Keypad PCB:
17. At the bottom left corner of the Main Keypad PCB, remove the drop of silicon sealant holding the ZIF
SMT Flip Door connector (J2) shut. The narrow ribbon cable in the connector is the Main Menu Keypad
Flex PCB.
18. Lift the connector cover open, and gently lift out the Main Menu Keypad Flex PCB. The Flex PCB stays
in the case, but must be protected and kept out of the way for the following operations .
19. Note that a 16-pin header connector is between the Main Keypad PCB (connector J1) and the
Mother Board (Main PCB) inside the case at connector J5006. The header pin connector is shown as
item 4 in Figure 7-30 on page 7-62.
20. Protecting the speaker and its connections on the PCB, gently pry up the PCB as the header pins
disconnect from the underlying the Main PCB Assembly.
21. Set the Main Keypad PCB aside and install the replacement PCB. The replacement unit should come
with an installed 16-pin header connector. The longer pins on the header go into the Main Keypad PCB.
The short pins will ultimately connect through the front cover mounting slot into the Main PCB
Assembly. Inspect the header pins to make sure that they are straight and evenly spaced.
If the 16-pin header connector is not included with the replacement PCB, then remove the existing
16-pin header from the old PCB and install it into the replacement unit. As stated, the long pins go into
the Main Keypad PCB, and the short pins go through the case slot into the Main PCB.
22. Carefully position the replacement Main Keypad PCB on the case with the 16-pin header going into the
case slot.
23. When the position is verified, and you are sure that the header is correctly located, gently press the PCB
into place, making full contact with the Main PCB Assembly.
24. Open the connector Flip Latch in the lower left corner of the PCB and insert the Main Menu Keypad Flex
PCB into the connector (J2). Push the connector Flip Latch down and add a drop of RTV (Room
Temperature Vulcanizing silicon sealant) to hold the door shut. Allow ample time for the sealant to set.
Anritsu Part Number: 3-783-1102 − RTV Silicon Sealant
25. Either replace or reinstall the Main Keypad Rubber Membrane by following Step 11 on page 7-15 to
Step 15 on page 7-15.
Installing Main Keypad Bezel:
26. Replace Main Keypad Bezel by first centering it on the key membrane and the Speaker.
27. Carefully align the speaker mounting pins of the bezel with the holes in the speaker assembly.
Note Do not crimp, fold, or puncture the Main Menu Keypad Flex PCB.
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