Midmark M9 - C574

SECTION II
TESTING AND TROUBLESHOOTING
© Midmark Corporation 2002 SF-1803 Page 2-14 Printed in U.S.A.
Code C573. (Continued)
(Error Type: FATAL )
(Continued)
C573: HEATUP MODE
STEAM TEMP OVERLIM
ITEMS NOT STERILE
UNPLUG / RE-PLUG UNIT
Steam temperature
exceeds 284°F (140°C)
during HEAT UP mode.
Tray Plate installed back-
ward in chamber causing
water level sensor short-
ing to plate resulting in
no fill and heaters to
overheat.
Check to assure Tray
Plate is installed cor-
rectly.
Inform operator of correct
position of Tray Plate.
Steam Temperature
Sensor (RTD) malfunc-
tioning.
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).
Pressure line to Pressure
Transducer restricted or
clogged.
Check for restriction in
tubing and chamber
access hole for Pressure
Transducer.
Clear any restriction that could
prevent chamber pressure
from reaching Pressure Trans-
ducer.
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
C574.
(Error Type: FATAL )
C574: STERILIZE MODE
STEAM TEMP OVERLIM
ITEMS NOT STERILE
UNPLUG / RE-PLUG UNIT
Steam temperature
exceeds 284°F (140°C)
during STERILIZE mode.
Water ran out of cham-
ber thru Vent or Fill Valve
resulting in an overheat
condition.
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
Sensor (RTD) malfunc-
tioning.
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).
Pressure line to Pressure
Transducer restricted or
clogged.
Check for restriction in
tubing and chamber
access hole for Pressure
Transducer.
Clear any restriction that could
prevent chamber pressure
from reaching Pressure Trans-
ducer.
Table 2-3. Troubleshooting Guide
Problem Display / Symptom Probable Cause Check Correction
Return To Table of Contents