Midmark M9 - Page 27

SECTION II
TESTING AND TROUBLESHOOTING
© Midmark Corporation 2002 SF-1803 Page 2-15 Printed in U.S.A.
Code C574.(Continued)
(Error Type: FATAL )
(Continued)
C574: STERILIZE MODE
STEAM TEMP OVERLIM
ITEMS NOT STERILE
UNPLUG / RE-PLUG UNIT
Steam temperature
exceeds 284°F (140°C)
during STERILIZE mode.
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
C575.
(Error Type: FATAL )
C575: VENT MODE
STEAM TEMP OVERLIM
ITEMS NOT STERILE *
UNPLUG / RE-PLUG UNIT
Steam temperature
exceeds 284°F (140°C)
during VENT 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 and check for
debris in Valve and
related lines and fittings.
Clean or replace Vent Valve,
related lines and fittings (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).
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
C577.
(Error Type: FATAL )
C577: DRY MODE
STEAM TEMP OVERLIM
UNPLUG / RE-PLUG UNIT
Steam temperature
exceeds 284°F (140°C)
during DRY OPEN mode.
Steam Temperature Sen-
sor (RTD), located in rear
of chamber, 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).
Table 2-3. Troubleshooting Guide
Problem Display / Symptom Probable Cause Check Correction
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