Midmark M11 - Page 4

English-4
004-1032-00
TP210 Rev. A
© 2012 Midmark Corp. | 60 Vista Drive Versailles, OH 45380 USA | 1-800-643-6275 | 1-937-526-3662 |
[Revised: 8/15/17]
Troubleshooting Chart - continued
Problem Display / Symptom Cause Check Action
Display shows all blocks
Display shows all blocks. Contrast out of adjustment. Check contrast adjustment. Perform LCD Contrast adjustment.
Ribbon harness from touch pad to
display panel (J2) is disconnected or
damaged.
Check ribbon harness connections. Secure ribbon harness connections.
Check continuity of ribbon harness. Replace ribbon harness.
Build up or corrosion on Display PC
connection pins & harness.
Clean Display PC connection pins.
Replace Display PC board.
Display malfunctioning
Touch pad is working
Display panel shows undefined
characters and emits intermittent beeps.
Contrast out of adjustment. Check contrast adjustment. Perform LCD Contrast adjustment.
Ribbon harness from touch pad to
display panel (J2) is disconnected or
damaged.
Check ribbon harness connections. Secure ribbon harness connections.
Check continuity of ribbon harness. Replace ribbon harness.
Build up or corrosion on Display PC
connection pins & harness.
Clean Display PC connection pins.
Replace Display PC board.
Door not closing
Door not closing. Door spring missing / damaged. If the door motor releases the latch,
but the door remains closed, Inspect
door spring for damage.
Replace door springs.
Verify if door is at the vented position.
(Push in on door with out lifting handle)
Verify the QTY of door springs.
(M11- QTY 2, M9-QTY 1)
Verify door springs are at a 45 degree
angle.
Place door spring at a 45 degree angle.
Door / Dam gasket(s). Inspect door / dam gaskets for proper
installation and any signs of sticking.
Install door / dam gaskets properly.
If new gasket, check if wire ring in
gasket is preventing gasket from fully
being seated.
Temporarily remove wire ring.
Re-install wire ring after gasket is fully seated.
Trays not pushed in properly. Be sure trays slide in properly. Remove obstructions that prevent the
trays from sliding in completely.
Door pins / latch binding. With door open, door handle should
move Up / Down freely.
Clean door pins / latch mechanism.
(Clean with Synthetic Dry Protectant - Aerosol /
Spray on)
Inspect latch mechanism for
wear / damage.
Replace worn / damaged components.
Door motor system / latch
“hanging up”.
Remove the door cover and RH side panel. With
the door closed, run the
‘Door Open Test’. Watch for any
mechanical issues that may prevent the
door from opening. Refer to:
Service Diagnostics (I/O Test)
Replace worn / damaged components.
Verify Door Motor is angled as close to
PC board as possible.
Adjust door motor angle.
Remove the door cover and RH side panel. With
the door closed, run the
‘Door Open Test’. Watch for any
mechanical issues that may prevent the
door from opening. Refer to:
Service Diagnostics (I/O Test)
Replace door motor.
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