Midmark M9 - Page 32

SECTION II
TESTING AND TROUBLESHOOTING
© Midmark Corporation 2002 SF-1803 Page 2-20 Printed in U.S.A.
Code C675 VENT
(Error Type: FATAL )
(Refer to column on left for
codes and description)
C67X: XXXXXX MODE
PRESSURE OVERLIM
ITEMS NOT STERILE
UNPLUG / RE-PLUG UNIT
Gauge pressure inside
chamber is greater than
34.8 PSIG (240 kPa) dur-
ing specific mode.
Filter screen in chamber
restricted.
Remove filter screen and
check condition.
Clean or replace filter screen.
Vent Valve malfunction-
ing or related lines or fit-
tings restricted.
•Run Service Diagnostics
and check Vent Valve
Operation. Check for
debris in lines and valve.
•If Vent Valve does not
operate check for line
voltage at terminals of
valve.
•If line voltage is present
but valve does not oper-
ate, disconnect power
from unit.
Disconnect leads from
Vent Valve coil and check
continuity.
115 VAC = 0.4 MOhms
230 VAC = 3.2 MOhms
(cold readings +/- 10 %)
If no continuity replace
valve.
Clean or replace Vent Valve,
related lines and fittings (Refer
to para 4.18).
Pressure Transducer or
Main P.C. Board Mal-
functioning.
Check for 5.0 VDC
between TP2 & TP4 &
pins of Pressure Trans-
ducer. (Refer to Sche-
matic in Section 5).
Voltage should be apprx.
4.5 VDC at all times with
unit plugged in. Also, run
Service Diagnostics.
If voltage is not present or Ser-
vice Diagnostics reveals a
problem replace P.C. Board
(Refer to para 4.13).
Code
C677.
(Error Type: FATAL )
C677: DRY MODE
PRESSURE OVERLIM
UNPLUG / RE-PLUG UNIT
Gauge pressure inside
chamber is greater than
34.8 PSIG (240 kPa) dur-
ing DRY mode.
Door did not fully open
even though latch
released allowing cham-
ber to retain a slight
pressure.
Run Service Diagnostics
to check component
operation. Check number
of cycles (back-to-back)
Operator ran before
problem occurred. Check
condition of door gasket.
If door gasket is worn or dirty
clean or replace gasket (Refer
to para 4.XX).
Inform Operator that problem
could occur when back-to-
back cycles have been run
and Start-up temperature is
230° F [110° C] or above.
Vent Valve malfunction-
ing or related lines or fit-
tings restricted.
•Run Service Diagnostics
and check Vent Valve
Operation. Check for
debris in lines and valve.
•If Vent Valve does not
operate check for line
voltage at terminals of
valve.
•If line voltage is present
but valve does not oper-
ate, disconnect power
from unit.
Disconnect leads from
Vent Valve coil and
check continuity.
115 VAC = 0.4 MOhms
230 VAC = 3.2 MOhms
(cold readings +/- 10 %)
If no continuity replace
valve.
Clean or replace Vent Valve,
related lines and fittings (Refer
to para 4.18).
Table 2-3. Troubleshooting Guide
Problem Display / Symptom Probable Cause Check Correction
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