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MRC88 / MRAUDIO8X8 QUICK START GUIDE
08905142A
11
Test the cable connections using a proper CAT5 cable tester or use a
multimeter to check pin to pin continuity and for possible shorts. Using
either method, it is advisable to measure pins 3 and 6 to verify proper
voltage. A 12VDC measurement should be read when the positive probe is
on pin 6 and the negative probe is on pin 3. See Figure 7.
AC POWER
It is recommended, but not required, that the MRC88 Controller and head-end
source components be powered by a dedicated 20-amp circuit with an isolated
ground.
Whole-house system components turning on/off at various times (head-
end/common sources that may time out or local zone sources and amplifiers
turning on/off), lighting systems and other household appliances, can introduce
undesirable conditions (surges, ground hum, EMI, RFI, clicks and pops) on the
AC line that can adversely affect overall system performance.
An AC line conditioner can also be incorporated to protect components from
unstable AC and improve system performance by filtering AC line noise.
GROUNING SCREW
Connect to earth ground or other A/V components to aid in the
reduction of system noise such as an audible hum created by the
difference in ground potential between devices, if needed.