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7.3.1
Removing the CPU, PS, User Interface Assembly
Once Technical Support has determined that a problem exists with either the CPU, Power Supply, or the
User Interface, use the following procedure to remove the assembly and return it to Honeywell for repair.
1. Disconnect AC power Cable.
2. Disconnect the backup battery. (See Figure 3–14.)
3. Remove the front plate by unscrewing the front plate retaining screws. (See Figure 3–1 for locations of
front plate retaining screws.)
4. On the back of the receiver remove the four screws that hold the CPU, PS, User Interface Assembly to
the chassis. (See Figure 7–1 for screw locations.)
Figure 7–1: User CPU, PS, User Interface Assembly retaining Screw Locations
5. From the front of the receiver, pull the CPU, PS, User Interface Assembly out of the receiver chassis.
7.3.2
Replacing the CPU, PS, User Interface Assembly
1. From the front of the receiver, slide the replacement CPU, PS, User Interface Assembly back into the
receiver chassis.
2. On the back of the receiver, replace the four screws that hold the CPU, PS, User Interface Assembly in
place. (See Figure 7–1.)
3. Reconnect the AC power cable.
Note: Make sure to plug the AC power cable into a grounded outlet. (See Section 3.11.2 for procedure on
how to verify earth ground.)
4. Reconnect the back-up battery. (See Figure 3–14.)
5. Replace the front plate by screwing in the front plate retaining screws. (See Figure 3–1.)
7.4
Safe Mode
Safe mode can be used to reset User #01 access code back to default of MX8000 regardless of its present
setting.
For Example, if the code for the installer (User #01) is lost and additional programming is required the
receiver can be restarted in safe mode to return User #01 to an access code of 8000.
Follow these steps to initiate Safe Mode and default User code #01:
1. Follow the steps in Section 4.6.7 to restart the receiver.
Note: All messages must be acknowledged before a system restart procedure can be performed. If all
messages are not acknowledged, cycle the receiver's power to restart the system. If the power is cycled all
unacknowledged messages will be lost.
2. When the display Shows
120 VAC ± 10%
240 VAC ± 10%
50-60 Hz
100 VA
WARNING!
REPLACE ONLY
HIGH VOLTAGE PRESENT
DISCONNECT AC LINE AND
OF SAME TYPE
ALL OTHER CONNECTORS
PROIR TO SERVICING
RELAY RATING
2.5A 48VAC/VDC
COM 1
BATT-
BATT+
RLY NC
PARALLEL
COM 2
Model MX8000 Receiver
ADEMCO
FUSE
2.5A
SLOW BLOW
WITH A FUSE
Screw
UNUSED
RLY NO
Locations
RLY COM
Section 7 – Troubleshooting
7–5
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Table of Contents
Troubleshooting
