Food Service Trade Department
3M Commercial Care Division
3M Center, Building 551-1E-02
St. Paul, MN 55144-1000 19981104
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C-Series Intercom Systems
Model C5000
Technical Bulletin 11/4/98
• If a Heavy Duty Security Handset (78-6911-2379-4) is to be used with a C5000 system, the trigger
pulse from the handset needs to be lengthened. Replace the 1 microFarad capacitor and 100k Ohm
resistor on the terminal block with a 10 microFarad capacitor and 20k ohm resistor. All handsets from
our stock received after July, 1998 have these updates. They can be recognized by a “07/98 Rev. C”
sticker on the outside of the shipping box and inside the stainless cradle switch cover. This
modification is compatible with all D-Series intercoms.
• If a C5000 Station Selector occasionally resets itself (shuts off, then comes back on with a series of
beeps), the RS-485 buss wiring may be too small. We recommend that the RS-485 buss wiring from
the Controller to the Selectors be 18 gauge. Another solution is to use an additional 9 VDC power
supply on the offending Station Selector.
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