Midmark M9 - C544

SECTION II
TESTING AND TROUBLESHOOTING
© Midmark Corporation 2002 SF-1803 Page 2-11 Printed in U.S.A.
Code C534. (Continued)
(Error Type: FATAL )
(Continued)
C534: STERILIZE MODE
STEAM TEMP LOW
ITEMS NOT STERILE
UNPLUG / RE-PLUG UNIT
During the Sterilization
Mode of the particular
cycle, the chamber temp.
drops below the cycle’s
designated sterilization
temp.
Steam leakage from
chamber.
Check door gasket, all fit-
tings and valves for leak-
age.
Repair or replace leaking com-
ponent(s).
Steam Temperature sen-
sor (RTD) is malfunction-
ing.
Remove plug connector
at J12 on P.C. Board and
check resistance value
(ohms) of RTD between
white and red leads.
Resistance values
should be between the
following:
75°F (23°C) = 1090
ohms.
545°F (285°C) = 2066
ohms.
Above values +/- 10
Ohms
If Steam Temperature probe
shows open or values outside
resistance ranges replace
probe (Refer to para 4.10).
Main P.C. Board Mal-
functioning.
Check for 5.0 VDC
between TP2 & TP4.
Remove plug connector
at J12 on P.C. Board and
check voltage on pins 1 &
2.
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
C544.
(Error Type: FATAL )
C544: STERILIZE MODE
STEAM TEMP HIGH
ITEMS NOT STERILE
UNPLUG / RE-PLUG UNIT
During the Sterilization
Mode of the particular
cycle, the chamber temp.
increases (+6°F) above
the cycle’s designated
sterilization temp.
Water dissipated or
leaked out thru Vent or
Fill Valve causing tem-
perature in chamber to
fluctuate over Steriliza-
tion temperature.
Check condition of Vent
and Fill Valves to assure
they are not leaking thru
valve.
Replace malfunctioning valve
if required. Refer to para 4.18.
Steam Temperature sen-
sor (RTD) is malfunction-
ing.
Remove plug connector
at J12 on P.C. Board and
check resistance value
(ohms) of RTD between
white and red leads.
Resistance values
should be between the
following:
75°F (23°C) = 1090
ohms.
545°F (285°C) = 2066
ohms.
Above values +/- 10
Ohms
If Steam Temperature probe
shows open or values outside
resistance ranges replace
probe (Refer to para 4.10).
Main P.C. Board Mal-
functioning.
Check for 5.0 VDC
between TP2 & TP4.
Remove plug connector
at J12 on P.C. Board
and check voltage on
pins 1 & 2.
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).
Table 2-3. Troubleshooting Guide
Problem Display / Symptom Probable Cause Check Correction
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