
NM2B
REPLACEMENT PROCEDURES (continued)
4.21
Alarm Channel (without oxygen supply pressure alarm switch)
Replacement of the alarm channel requires removal of the upper flowmeter
front cover plate. (On later models the vapor box cover plate is extended to also
cover the flowmeter shield and alarm channel.) The alarm channel assembly
is held in place by two screws from the back. Figure 4-21 shows a rear view of
the assembly and its connections.
4.21.1
Disconnect the pipeline hoses and close all cylinder valves.
4.21.2
Press the O
2
Flush valve to drain oxygen pressure from the system.
4.21.3
Set the System Power switch to
STANDBY
and remove AC power
from the machine.
4.21.4
Remove the screws holding the rear cover, and remove the cover.
4.21.5
Remove the screws holding the table top, and lift out the table top.
CAUTION: The circuit board contains static sensitive devices. Use
ESD protection when handling this assembly.
4.21.6
Disconnect the cables from J1, J2, J3 and J4 on the alarm circuit
board.
WARNING:
Ensure that AC power is removed from the
machine before disconnecting the cables. Failure
to observe this precaution may cause injury by
electric shock.
4.21.7
Disconnect the two compression fittings at the system power switch
valve.
4.21.8A Early models: Remove the two screws (from the back) holding the
angled cover plate at the top of the channel. Hold the cover plate as
the screws are removed from the back.
4.21.8B Later models (without the O
2
/N
2
O ratio alarm lamp): Remove the six
screws holding the flowmeter shield and vapor box cover, and remove
the panel.
4.21.9
Feed the flowmeter lights wire harness through the hole at the top of
the alarm channel.
Rev. J
4-73
Содержание Narkomed 2B
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