No Display (Screen Is Blank) - TurboChef encore Service Manual

44 TROublESHOOTInG
Is wiring from the
control board to the
display oK?
YES
Is pin 1 on the J7
connector receiving 5
VDC? (See page 48
for Encore schematic/
page 62 for Encore 2
schematic.)
YES
Is the display area hot
(higher than 120ºF
[49ºC])?
No
replace the display.
Troubleshooting:
no display – Screen is blank
Does the keypad beep when
YES
a key is pressed?
replace the F1 and/or
the F2 fuse.
Correct wiring. If
No
ribbon cable is
damaged, replace the
ribbon cable.
replace the power
supply.
replace the control
No
board.
Check wiring from the
power supply to the
control board. Correct
wiring if necessary.
YES
Go to page 41 for F6: EC
Temp troubleshooting.
replace the keypad.
No
Is the power supply
receiving power? (Is
No
the green light on?)
YES
Is the power supply
output 24 VDC?
No
YES
Is the control board
receiving correct VDC?
No
Verify voltage on pin 2
of the J7 connector is
24 VDC (See page 48
for Encore schematic/
page 62 for Encore 2
schematic).
YES
Is 5 VDC present on pin
1 of the J7 connector? If
not, replace the control
board.
YES
No
replace the control board.