Thermo Scientific 7450, Operating And Maintenance Manual

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3. Service
This menu is for use by qualified service personnel. Entry into this
menu has a required service access code.
Warning This area may be accessed by qualified service personnel only. ▲
A. Manual Control
Individually or in any combination, turns on fan, heater, Cool
solenoid and Cool+ solenoid for diagnostic or troubleshooting
purposes and displays the status of each component. Upon
entering the menu, the Enter and Back keys position a cursor over
the item to control. The up arrow turns On the selected item and
the down arrow turns it Off. When the menu is exited (Back key),
any function that has been turned On will be turned Off and the
unit reverts to Idle Mode.
Note Fan will run whenever the heater is energized. The solenoid closest to
the front of the unit will be energized when Cool is activated. ▲
B. Print Error Logs
This menu item prints and resets the diagnostic error logs that are
stored in battery RAM. Each error log consists of the alarm
message and the time/date of occurrence. A maximum of 20 alarms
for each alarm type are stored in the log. Older entries are
discarded when more than 20 alarms are accumulated.
The following is a list of alarm types stored.
• Chamber/Sample probe failure during a run
• Chamber/Sample over/under temperature limit
• Power failure (also stores power failure duration)
• Heater error
• Check LN2 supply
• RS-232 communication error
C. Reset Error Logs
This menu item is used to clear the Error Log entries. When the
log is empty, this item reads “Error Log Empty”.
7007452 CryoMed Freezer 3-5 Thermo Scientific
Section 3
Configuration/Calibration
Menu Entry
Definitions (cont.)