Merco MHU63SST2N, Руководство по обслуживанию

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4-6
Maintenance Section 4
INSTRUCTIONS FOR REPLACING AN IO BOARD
1. Disconnect power.
2. Remove the top of the cabinet.
3. Mark wires and harnesses locations for easy reassembly.
4. Disconnect wires and harnesses.
5. Remove the existing IO board.
6. Service boards come with the DIP switch and jumper set
to default positions. They must be repositioned to reflect
the board being replaced. Reposition the settings on
new IO board on J5 and SW 1 the same as the removed
IO board (see illustrations to the right and below and the
on the following page).
7. Carefully reattach all wires and harnesses.
8. Replace the cabinet top and reconnect to power to
return to service.
SW1 and J5 settings together define the system
address.
I/O Board Switch and Jumper Settings
J5 Jumper
Setting
SW1 Setting
ON
1 2
3
ON
1 2 3
ON
1 2 3
32
1
32
1
32
1
SW1
SW1
SW1
J5
J5
J5
Master IO
Slave 1
Slave 2
ON
1 2
J5 Slave 3
32
1
ON
1 2
32
1
SW1 J5 Slave 4
3
3
SW1
,
Caution
Ensure SW1 dip switches and J5 jumper
match the old I/O Board upon replacement.
When the jumper is in the wrong position, zones will
not display when checking temperature.