3M C1060 Manual page 58

Instructions for replacing the C960 Inner Case
The C960 Inner Case Assembly is now available as a spare part (78-8095-0559-3). Be sure to transfer the serial
number sticker to the new case to continue the warranty, and it is a good idea to write the serial number on the
case with an indelible marker. Use this procedure if you want to re-use the speaker assembly. This procedure
should work 90% of the time. Occasionally you may need to disassemble the Speaker Assembly to gain access
to the Ear Cup Joint and finish the job.
Refer to Figures 3-1 through 3-4 which are included in this bulletin and located on pages 3-8 through 3-10 in
the "Model C960 Headset Intercom System" Service Information Manual (78-6912-0673-0).
1. Refer to Figure 3-2. Remove two screws in the battery compartment and separate the case halves. Be
careful not to lose the battery release button and leaf spring.
2. Refer to Figure 3-3. Remove the mic and speaker plugs by forcing the tweezers under the lips of the
plugs.
3. Refer to Figure 3-4. Remove the speaker connector terminals from the connector housing by prying the
retaining tab up with the tip of the razor knife.
4. Refer to Figure 3-1. Rotate the ear cup joint clockwise in the two slots in the inner case. This can be
done by pushing the two feet with a pair of tweezers or a small screwdriver.
5. Remove the speaker assembly and leads from the inner case.
6. Transfer the small rectangular foam pad from the old inner case to the new inner case.
7. Feed the speaker leads through the hole in the new case.
8. Pre-twist the ear cup joint feet clockwise. They should remain slightly past the halfway point of the
slots in the speaker assembly.
9. Align the two feet of the joint with the slots in the case.
10. Push down hard on the speaker assembly and twist clockwise while rocking it side to side until the two
feet come through the slots in the case. The tweezers or screwdriver will help this process.
11. Rotate the feet fully counterclockwise in the slots to lock the speaker assembly in place. The tweezers
or screwdriver will help this process.
Figure 3-1.
2