Check whether there is voltage on the magnetic valves during their period
of
operation.
If
there is no voltage a wire is broken or the PC board is damaged.
Lid does not open
at
the end
of
the cycle; air enters, but there is still 20 - 40% vacuum
in chamber. Vacuum valve does not close.
4.5 MC40 Control board failure
NOTE: Refer to menu structure on page 9.
This board software is allowi
ng
access to a "Diagnostics Menu". Only qualified service
technicians are authorized to access this menu by entering a security password.
By acceding either the "01 input test" feature
or
the
"02
output test" feature, a trained
technician will be able to quickly know the origin
of
the problem: pump,
sealing system, pneumatic problem, security
sw
itches problem, etc
..
.
Keep in mind that in most cases trouble is due to a leakage, loose electrical Keynesian
or
evident damage to the main component: vacuum pump, valves
..
. , electrical
· contactors, thermal overload, fuses holder
or
tr
ansformer.
For assistance do not hesitate to contact your local service technicians.
5. Regular maintenance:
Routine controls to be made
at
regular intervals:
Check Teflon for wear.
Check silicone rubber for burnt spots and smooth even position.
Check pressure bar for jamming.
Check lid sealing for damage and hardened spots.
Check switch-point
of
micro switch, adjust
if
necessary.
Check evacuation hose for damage (contraction
of
diameter, or abrasions).
Check vacuum connections
for
tightness.
Check oil in pump (oil level in view glass; add
if
necessary. Regul
ar
change
of
oil - necessity
indicated
by
change
of
color).
Check vacuum in chamber with precision vacuumeter.
Check function
of
cycle with various settings
of
timers.
18
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