Honeywell C7076A Operating Instructions Manual page 12

14.2 Replacing the Plug-In electronics chassis
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Replacing the plug-in electronics chassis
1 Rear cover
2 4 x Captive screws
3 4 x Standoffs
4 Plug-in electronics chassis
5 Slot
6 Key
1 Open the master switch to interrupt all power to the detector.
2 Loosen the four captive screws in the rear cover plate and remove
the plate.
3 Remove the four standoffs that hold the plug-in electronics chas-
sis and pull the chassis out of the housing.
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Make sure the part number and the voltage rating of the new
chassis are correct.
4 Insert the new chassis in the housing.
5 Align the slot in the top of the new chassis with the key in the
housing
6 Firmly push the chassis all the way in the housing. Make sure the
octal plug on the chassis is securely seated in the socket in the
housing.
7 Insert the four standoffs that hold the chassis and tighten them
securely.
8 Close the master switch and perform the Adjustments and Check-
out (see page 8 (11 Adjustments and checkout).)
9 Put the rear cover plate back on and tighten the four screws
securely.
14.3 Replacing the ultraviolet sensing tube
Replacing the ultraviolet sensing tube
1 Sensing tube
2 Alignment guide
3 Tab
4 Socket
1 Open the master switch to interrupt all power to the detector.
2 Remove the plug-in electronics chassis as specified above in
page 12 (14.2 Replacing the Plug-In electronics chassis).
3 Locate the sensing tube near the top of the chassis.
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4 Gently push the alignment guide away from the tube until the tip
of the tube is free.
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5 While holding the alignment guide away from the tube tip, grasp
the tab on the tube bracket and swing the tube out from the
chassis.
6 Pull the tube out of its socket.
7 Align the three pins on the new tube with the holes in the socket.
8 Push the new tube firmly into the socket. Make sure it is seated
securely.
9 Swing the tube back into place in the chassis. The alignment
guide will snap into place around the tip of the tube.
10 Reinstall the plug-in electronics chassis as specified above in
page 12 (14.2 Replacing the Plug-In electronics chassis).
11 Close the master switch and perform the Adjustments and Check-
out (see page 8 (11 Adjustments and checkout).
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Be very careful not to kink or otherwise damage the shutter.
14.4 Replacing the coil and shutter assembly
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Location of the coil and shutter assembly
1 Coil
2 Alignment guide
3 2 x Withe coil wires
4 Transformer leadwires
5 Sensing tube
6 3 x Mounting screws
7 Octul plug
1 Open the master switch to interrupt all power to the detector.
2 Remove the plug-in electronics chassis as specified above in
page 12 (14.2 Replacing the Plug-In electronics chassis).
3 Locate the coil near the bottom of the chassis.
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