Midmark M9 - Page 29

SECTION II
TESTING AND TROUBLESHOOTING
© Midmark Corporation 2002 SF-1803 Page 2-17 Printed in U.S.A.
Code C645. (Continued)
(Error Type: RESTART )
(Continued)
C645: VENT MODE
PRESSURE HIGH
ITEMS NOT STERILE
PUSH STOP TO RESTART
Absolute pressure inside
chamber is greater than
0.7 PSIg (5 kPa) for longer
than 5 minutes (i.e., Vent
mode not complete).
Pressure Transducer or
Main P.C. Board Malfunc-
tioning.
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
C647.
(Error Type: RESTART )
C647: DRY MODE
PRESSURE HIGH
PUSH STOP TO RESTART
Gauge pressure inside
chamber is equal to or
greater than 2.18 PSIg
(15 kPa) during DRY mode
or 0.7 PSIg (5 kPa) during
DOOR mode.
Door did not fully open
even though latch
released allowing cham-
ber to retain a slight
pressure.
Door Gasket may have
stuck due to abnormally
high temperatures at
Start-up (230° F [110° C]
or above) due to running
back-to-back cycles over
a period of time.
Run Service Diagnostics
to check component
operation. Check amount
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 4.8).
Inform Operator that problem
could occur when back-to-
back cycles have been ran
and Start-up temperature is
230° F [110° C] or above.
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).
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
C660.
(Error Type: FATAL )
Note: When a Code ends in
“0” it means unit had a sup-
ply power interruption.
The operator could have
unplugged the unit when a
previous Code was dis-
played.
Always go to Service Diag-
nostics and check previous 5
codes that are displayed.
C660: POWER UP MODE
PRESSURE HARDWARE
UNPLUG / RE-PLUG UNIT
Pressure A / D converter
reports an average value
outside the limits for nor-
mal operation during
POWER UP mode.
May be due to a malfunc-
tion that occurred previ-
ously to Code displayed.
Go to Service Diagnos-
tics and check previous 5
displayed codes.
Refer to Code Numbers in
Troubleshooting Guide to
determine correction.
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).
Table 2-3. Troubleshooting Guide
Problem Display / Symptom Probable Cause Check Correction
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