Vulcan-Hart ML-126743 Service Manual page 33

VC4E & VC6E Series Full Size Electric Convection Ovens - SERVICE PROCEDURES AND ADJUSTMENTS
#8 - Electronic beeper (external)
sounds.
B. If the output tests are completed
successfully, proceed to step 4.
C. If the output tests are not completed
successfully, find the source of the problem.
If the problem cannot be repaired, replace
the component and check for proper
operation.
4. Press the Rack 1 key twice to advance past the
"LI" (Logic Inputs test) and reach the "HEY"
(keyboard) test.
A. Press the desired key to display the
corresponding hexadecimal code. This
code is used internally by the control to
identify the key being pressed. See table
below.
KEY CODE
Up Arrow 40
Down Arrow 80
½ menu 800
3/4 menu 4000
5/6 menu 2
Set 200
Time 1000
Roast & Hold 8000
* Displays 10 momentarily then alternates
between Hey and 0. If pressed again, advances to
the next test.
B. If the code displayed is not correct for the
key pressed, then the keyboard is
malfunctioning.
1) Turn the power switch OFF.
electrical power to the machine and
follow lockout / tagout procedures.
There may be multiple circuits. Be sure
all circuits are disconnected.
C. Replace the computer control and check for
proper operation.
5. Press the Rack 1 key to advance the display
menu to the "dISP" (display) test. A test
sequence automatically runs on the display and
control LEDs for a visual verification that all
segments in the LED display and the internal
LEDs are functioning.
KEY CODE
Start/Stop 4
Temp 20
Rack 1 10 *
Rack 2 400
Rack 3 2000
Rack 4 1
Rack 5 8
Disconnect the
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6. At the end of the test, the control exits the
calibration mode and returns to the Operation
Mode.
Restore Factory Settings
NOTE: If the computer control does not appear
to be functioning properly, do not restore factory
settings until verifying the control is configured
properly as outlined in SETUP MODE under
COMPUTER CONTROL and performing the
COMPUTER CONTROL OPERATIONAL TEST
as outlined in the above section.
1. Enter the "Calibration Mode" by using the key
sequence stated in step 1 under COMPUTER
CONTROL OPERATIONAL TEST.
A. The computer control outputs are turned
OFF.
B. The display will alternate between "CALY"
and "no".
2. Press the up or down arrow key until the "rESt"
parameter displays.
3. Press the Rack 1 key and "no" displays.
4. Press the up or down arrow key to change the
display to "YES".
5. Press the Rack 1 key to select this data option
and then advance the menu to the "LgOt" (logic
output test).
NOTE: The "g" in LgOt displays as a "9".
6. Press the Rack 1 key twice to advance past the
"LI" (Logic Inputs test) and the "HEY" (keyboard)
test.
7. The "dISP" (display) test sequence automatically
runs.
8. At the end of the test, the control exits the
calibration mode and returns to the Operation
Mode.
9. Enter the "SETUP MODE" as outlined under
COMPUTER CONTROL and perform the
procedure.
F25105 Rev. B (0217)