Thermo Electron 8600 Series, Troubleshooting Service Manual

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4 - 1
Section 4 - Hidden Functions
4.1 Hidden Test
The Hidden Test Mode is used for testing freezer
components. The test functions are listed and described
below. To enter Hidden Test mode, press the left and
right arrow keys simultaneously. Press the right or left
arrow until the appropriate function appears in the
message center.
a. High Stage Compressor
To test the high stage compressor:
1. Press the right arrow until HS COMPRESR ON is
displayed in the message center.
2. Press up/down arrow to toggle to OFF.
3. Press enter to initiate the test.
High Stage compressor will manually be turned ON as
used in normal operation. To deactivate an on-going test
press up/down to toggle to OFF and then press Enter.
To exit test mode, press the mode key and the freezer
will resume normal operation. If no keys are pressed
within a one hour interval, the freezer will return to
Run mode.
b. Low Stage Compressor
The low stage compressor is manually turned ON/OFF
as used in normal operation.
c. Fan 1
Fan 1 is manually turned ON/OFF as used in normal
operation.
d. Fan 2
Fan 2 is manually turned ON/OFF as used in normal
operation.
e. Heaters
The freezer heaters are manually turned ON/OFF as
used in normal operation.
f. High Stage Heat Exchange Temperature
Displays the temperature.
g. High Stage Condenser Temperature
Displays the temperature.
h. Toggle Remote Alarm Contacts
The remote alarm contacts are toggled ON/OFF. ON
places the contacts in alarm condition, OFF represents
no alarm condition. Press enter.
i. Serial Port Data Burst
The freezer transmits a 2 second data stream from the
RS-232/RS-485 port.
j. EEPROM Initialize
This function is used for field software updates. All
settings will be reset to factory default settings upon
initialization.
1. Press the right arrow until EEPROM INIT is
displayed in the message center.
2. Press enter.
3. OK EE INIT? will be displayed in the message center.
4. Press enter to begin initialization.
k. Refrigeration Tank Solenoid
The refrigeration tank solenoid is manually
opened/closed, OPN/CLS as used in normal operation.