Service manual

ITCB-DV HV Training
24
Test Switches
Press any of the input buttons on the membrane switch, the display will show which button is being pressed.
Test Frequency
The funnel sensing circuit is tuned to 125 kHz. If the circuit is not tuned correctly, then the funnel information will not
be transferred to the brewer. Therefore, the microprocessor is constantly ne tuning to get as close as possible to
125 kHz. It has eight possible tuning steps numbered 0 - 7. When you look at the “TEST FREQUENCY” screen you
see something like (124.7 KHZ .5) The 124.7 is the frequency, and the 5 is the tuning step. The decimal point next to
the 5 indicates the funnel is being detected; if the funnel is removed the decimal point should turn off.
Service Fault Messages
The brewer features several error messages for problems occurring within the machine. These error messages will
show up on the display.
This message will be shown if the control board does not see the programmed water
temperature with 60 minutes.
This message will be shown if the control board does not see the tank ll within
30 minutes.
This message will be shown if the control board loses contact with the temperature
sensor or senses a short in the connection.
This message will be shown if the thermistor under the top hood panel senses
ambient air temperatures exceeding 158°F/70°C. ( below 1,753 Ohms)
In the event that a Check Fan message appears on the display:
1. Check for any obstructions on top of the hood vent.
- If hood vent checks ok, proceed to next step.
2. Take a digital thermometer and place it in one of the top hood vents. Record the temperature.
Note: Do not remove the top hood prior to recording the ambient temperature within the hood. Doing so will
dissipate heat, which will affect the temperature being monitored by the thermistor.
- Proceed to next step.
3. Remove the top hood panel. Check the 120VAC fan and ensure this component is working properly.
Note: by removing the top hood panel, the Check Fan message may or may not be on the display.
- If fan checks ok, proceed to next step.
TEST SWITCHES?
NO YES
TEST FREQUENCY?
NO YES
HEATING TIME
TOO LONG
FILL TIME TOO
LONG
TEMP SENSOR
OUT OF RANGE
BREW
A
BREW
B
BREW
C
®
ENABLE
ON / OFF
BREW
HALF
FULL
BREW
A
BREW
B
BREW
C
®
ENABLE
ON / OFF
BREW
Right Hidden Switch
CHECK FAN