Troubleshooting Of Messenger Dispenser - Amana 22, 24, & 26 Cu. Ft. Side by Side Refrigerators Service Manual

Ice 'N Water Systems
Troubleshooting of Amana Messenger Ice 'N Water dispenser
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Power Board: This PCB is attached to the freezer door cavity. A wire harness from the door hinge runs
through the door and terminates in the cavity. The power board receives its power from this harness.
This PCB has 4 relays and a triac onboard that control the water valve, the night-light, the ice chute solenoid
as well as the auger motor for crushed and cubed ice.
Control Board: This PCB is attached to the dispenser fa£ade by 2 screws. All of the LCD Modules graphic
information, message center voice information and the microcontroller logic are onboard. There is also a
breakaway PCB with a microphone for the message center and a light sensor for automatic night-light
operation. The breakaway PCB attaches to the fa£ade by 2 snaps and a couple of alignment rails. This PCB
sends command signals to the power board to energize the relays and triac on the power board. The control
board receives its power from the power board through the 10-pin jumper harness. The voltage signals on
this board do not exceed 5 VDC when the refrigerator is operating.
LCD Module: This PCB is attached to the dispenser facade insert-molded, clear polycarbonate lens by 4
screws. It receives its power and information from a 20-pin ribbon cable that attaches to the control board.
It is a 288x96 FSTN liquid crystal graphic display utilizing 2 TAB drivers.
It also has 7 ultra-bright blue colored LEDs positioned along the top of the module that together form a
backlight so that graphic information is easily read in low ambient light oonditions.
Keyboard: This component has 6 switches and is attached to the front of the fagade. The switch circuits
attach to the control PCB via a tail through the back of the fagade.
Speaker: This component is attached to the ice chute extension by slidhg into a slot. A speaker cap is
pushed into place to hold the speaker in place. It couples the speaker energy into the surrounding plastic ant
prevents the speaker from rattling during high volume playback. The speaker will distort at high volume
message playback levels but it should not rattle. The speaker wires attach to the control board just under th_
keyboard connector.
RS1300005 Rev. 0 40