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Repair
Replace MZLP
Disassembly:
1. Turn main power switch OFF.
2. Remove electrical enclosure front access door (10).
3. Disconnect heated hose electrical connectors from
outside of MZLP (112).
4. Note location of each cable, then unplug all cables
from the MZLP (112) that will be replaced. See F
47.
5. Remove four screws (114) securing MZLP (112) to
electrical enclosure (1) then carefully remove MZLP
from electrical enclosure. See F
MZLP
#1
112
114
F
. 47
IG
6. Replace MZLP. See F
and MZLP #3 identification.
a. To replace MZLP #1, remove the daughter card
and standoffs, and re-install them on the new
MZLP #1.
b. To replace MZLP #3, remove the jumper (135)
from MZLP #3 J5 connector and reinstall it on
the new MZLP #3 J5 connector.
Reassembly:
1. Set MZLP rotary switch to "1" on MZLP with
daughter card. Set MZLP rotary switch to "2" or "3"
on MZLP without daughter card, based on location.
See F
. 48 for rotary switch location.
IG
68
. 47.
IG
MZLP
#3
MZLP
#2
. 47 for MZLP #1, MZLP #2,
IG
2. Apply channel label stickers to new MZLP. See F
47.
3. Use four screws (114) to install MZLP (112) to elec-
trical enclosure (1).
4. Reconnect cables to MZLP (112).
NOTE: Do not force the electrical connection. Minimal
force is required to seat the connector. If resistance is
felt, stop and verify the connector orientation.
NOTE: If unable to determine connector location, see
Electrical Schematics on page 78.
.
IG
5. Install electrical enclosure front access door (10).
6. Connect heated hose electrical connectors to new
MZLP.
NOTE: MZLP may need updated software. See Soft-
ware Update Procedure on page 77.
Replace MZLP Daughter Card
Disassembly:
1. Turn main power switch OFF.
2. Remove electrical enclosure front access door (10).
3. Note location of each cable then unplug all cables
from MZLP daughter card (112a).
4. Remove four mounting screws (112b) from daugh-
ter card (112a) and set aside.
112b
112a
112
F
. 48
IG
5. Unplug daughter card (112a) from the MZLP
#1 (112).
.
IG
ti20342a
Rotary Switch
333347F
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Table of Contents
Troubleshooting
