Pentax EG-2990i Instructions For Use Manual page 22

f) Release the air/water feeding valve to determine if the valve freely returns to its
OFF (neutral) position and delivery of water (and air) ceases.
CAUTION:
Before use, make sure that the air/water feeding valve is not clogged or
does not have any other problem that could cause the uninterrupted flow
of air/water. If the endoscope is used in such condition, it will hinder its
capability to clear the debris off the objective lens and the endoscopic
examination might be interrupted.
NOTE:
(EG-1690K)
The EG-1690K have a single, common internal channel, and a single
shared nozzle for air/water delivery. Since these functions occur within
a single channel, the following may be experienced when alternating
between these functions:
• A slight delay in air delivery with subsequent residual water flow
may occur immediately after switching from water to air activation.
This flow of fluid is due to the purging of residual fluid from the
common internal channel.
• A slight delay in water delivery may occur if activated
immediately after air delivery due to filling of the empty common
internal channel occupied by air.
g) If air and/or water do not flow properly, the following steps should be followed.
[1] Disconnect the endoscope from the video processor.
[2] Remove the suction control valve and the air/water feeding valve.
[3] Using a cotton tipped applicator and alcohol, clean the valve recess
(receptacle) in the control body thoroughly to remove any debris. Do NOT
attempt to insert the applicator into the small openings within the valve
receptacle as the cotton or applicator could become lodged within these
openings and cause channel blockage.
[4] • Following the companion Instructions for Use (reprocessing) for chemical
cleaning of the air and water channel with detergent, flush detergent
through both the air and water channels.
Rinse the air and water channel(s) with sterile water.
Then flush the air several times to force any residual solution out of the
channel.
• If the cleaning adapter is being attached, remove the adapters and install
the air/water feeding valve.
(Alternate) By leaving the air/water feeding valve in the cylinder instead of
the OF-B153 adapter, one may direct pressured fluid (or air) independently
to either channel to expel debris from and/or more forcefully flush solution
into either the air or water channel. This should not be attempted on a
completely clogged/blocked air or water channel/nozzle.
[5] Test for normal delivery of air and water. It may be necessary to repeat the
above procedure if normal air and water delivery is still not available.
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