Troubleshooting
!
WARNING
To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit, unless test
procedures require power to be connected. Discharge capacitor through a resistor before attempting to service.
Ensure all ground wires are connected before certifying unit as repaired and/or operational.
4
16022983 Rev. 0
©2004 Maytag Appliances Company
DISABLE SWITCHES and DOOR TEST
1. Apply power to the SKYBOX.
2. Verify that the door lights work properly, they can be
turned on and off.
Possible causes malfunction:
· Cable between the door and cabinet missing, not
wired correctly, or not plugged in fully.
· Light switch mounted upside-down.
· Incorrect wiring, wires crossed from each starter.
· Wire not pushed into socket or contamination on
wire.
· Starter or lamp missing or not installed properly.
· 120VAC wiring error.
· 120VAC not working at test outlet.
3. Move all DISABLE switches down (turn OFF the
bins).
4. Hold the MAIN DOOR switch closed, leaving the door
open.
5. All 4 LED on the door should be ON. If not, fail.
Possible causes:
· The LED that is OFF might have the DISABLE
switch assembled upside down, along with a bad
LOW PRODUCT switch circuit.
· If all of the LED flash slowly, there is a bad
connection between the door and the MAIN PCB.
(Loss of communications between the MAIN and
FPP PCBs).
· If the LED are all OFF, there is a bad connection
between the door and the MAIN PCB (no power).
· If the LED are all OFF, there is a bad connection
between the bin set and the MAIN PCB (ribbon
cable unplugged or bad).
· If the LED are all OFF, there is no power to the
MAIN PCB: verify that the 12VAC transformer is
connected to 120VAC between the bin set and the
MAIN PCB (ribbon cable unplugged). There are 2
LED on the MAIN PCB. The top LED indicates
communications TO the FPP (located in the door);
the bottom LED indicates communications FROM
the FPP.
· MAIN DOOR switch circuit not wired correctly:
wrong connection at switch or connector not
plugged into the MAIN PCB. When the MAIN
DOOR switch is first held closed, the LED should
flicker off for a very brief time.
6. Push SELECT pushbutton 1. Only LED1 should turn
off while the pushbutton is pushed. If not, fail.
· If multiple LED turn OFF, there is a problem with
the door electronics.
· If all 4 LED fast flash only while the SELECT
pushbutton is pushed, the FLIPPER DOOR is
open (or other problem in FLIPPER door sensor)
· If the wrong LED turns OFF, there is a problem
with the door electronics.
· If no LED turn OFF, there is a problem with the
door electronics.
· MAIN DOOR switch circuit not wired correctly:
wrong connection at switch or connector not
plugged into the MAIN PCB. When the MAIN
DOOR switch is first held closed, the LED should
flicker off for a very brief time.
7. Push SELECT pushbutton 2. Only LED 2 should turn
off while the pushbutton is pushed. If not, fail.
· If multiple LED turn OFF, there is a problem with
the door electronics.
· If all 4 LED fast flash only while the SELECT
pushbutton is pushed, the FLIPPER DOOR is
open (or other problem in FLIPPER door sensor)
· If the wrong LED turns OFF, there is a problem
with the door electronics.
· If no LED turn OFF, there is a problem with the
door electronics.
· MAIN DOOR switch circuit not wired correctly:
wrong connection at switch or connector not
plugged into the MAIN PCB. When the MAIN
DOOR switch is first held closed, the LED should
flicker off for a very brief time.
8. Push SELECT pushbutton 3. Only LED3 should turn
off while the pushbutton is pushed. If not, fail.
· If multiple LED turn OFF, there is a problem with
the door electronics.
· If all 4 LED fast flash only while the SELECT
pushbutton is pushed, the FLIPPER DOOR is
open (or other problem in FLIPPER door sensor).
· If the wrong LED turns OFF, there is a problem
with the door electronics.
· If no LED turn OFF, there is a problem with the
door electronics.
· MAIN DOOR switch circuit not wired correctly:
wrong connection at switch or connector not
plugged into the MAIN PCB. When the MAIN
DOOR switch is first held closed, the LED should
flicker off for a very brief time.
Summary of Contents for Skybox MBS1976AAB
Page 11: ...A 1 Appendix A...
Page 28: ...B 1 Appendix B...
