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5. Troubleshooting
Symptom Possible Cause Solution
MRKP2 does not power
up or resets itself
randomly
1. RJ-45 plug crimped
incorrectly; or wiring pin-
out of RJ-45 reversed.
2. Break or intermittent
connection in CAT-5
between Zone and “Head-
End”.
3. CAT5 cable length
exceeds specification, or
more than one keypad is
used in a zone.
Verify wiring pin-out and RJ-
45 crimp. Correct by re-
crimping RJ-45 to CAT-5
cable.
Check RJ-45 to RJ-45
connections with cable tester
or voltmeter. +12V terminal
on back of MRKP2 should
read +9V DC or higher with
the keypad on.
Use MRC44CB1 and
782ERGPS 12V High Current
AC Adaptor at keypad side,
prior to the first keypad.
The Next button on
touchscreen or any
other virtual button in
top right corner of the
screen is not
operational
Protect switch on
MX88/MRC88m is left in
Off position. Protect Off
setting is only to be used
during the QuickConfig
setup.
Return the Protect switch to
On position and reset the
MX88/MRC88m system
No control of IR
sources
1. Wiring: Incorrect wiring
between MRKP2 and
MRC88m.
2. IR emitter defective at
source.
3. IR Enable jumper is set
incorrectly
Verify and correct wiring.
Replace IR emitter.
Make sure IR Sensor Enable
jumper is properly configured.
(See Section 3 and Figure
3.1)
Intermittent IR source
control
IR flooding
Check to see if ambient light
is shining on built in IR
receiver or in direct line with
plasma TV noise. If the IR
emitter is flashing when IR is
not being sent, IR flooding is
likely cause. Disable the built-
in IR Receiver. Consider use
of an external IR Receiver
(see Fig 2.2 and 3.2).
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6. Specifications
MRKP2 basic dimensions and cable lengths
Front panel dimensions
4-1/2” (114mm) wide x 4-5/8” (117mm) high x 1/4”
(6mm) deep
Wall cutout
Depends on electrical back-box used – see below
Mounting depth
2-1/4” (57mm) for unit and wiring
– actual
mounting depth will depend on electrical back-box
used
Max length Cat-5
Cable* with 1 keypad
per zone
250 feet (75 meters) total per zone* If this
distance is exceeded, a MRC44CB1 and
782ERGPS should be placed right before the
keypad.
Max length Cat-5
cable* with 1 keypad
and 1, 2, or 3
expansion keypads
Must use MRC44CB1 connecting block and
782ERGPS 12V High Current AC adaptor at
and before the first keypad. After the first
keypad, each time a cable run exceeds 250
feet (75 meters) total, another MRC44CB1
and 782ERGPS will need to be added before
the next keypad.
Operating Temperature
& Humidity
32-104°F (0-40° C)
0-90% Relative Humidity
Compatible Electrical back-boxes
North American
standard two gang
electrical back boxes
Carlon® BH235A, B232A-UPC, B225R-UPC,
or BH234R
* CAT5/5e/6/7 may be used. Cable quality may reduce this maximum length.
Extending external IR receiver
connection with 3-wire cable
Size (AWG)
Maximum allowable
length (feet)
Extending external IR
receiver connection
with Cat-5 cable using all 8
conductors
24 150 Use 4 striped wires for GND
22 300 Use 2 solid wires for IR signal
20 1000 Use 2 solid wires for +12V
18 2000