M&R 12 COLOR, Manual

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Troubleshooting Procedure
M&R Printing Equipment, Inc. - Glen Ellyn, Illinois
124
PROBLEM PROBABLE CAUSE/SOLUTION
(Cont.)
Electrical power is indicated to con-
trols, but nothing operates.
During the set-up procedure a print
station start push button is activat-
ed, however the carousel does not
lift to the print position.
The indexer does not raise fully into
the print position.
The index table lifts and lowers too
fast or too slow.
4. Index “ON” proximity switch has failed or is mis-adjusted. Check to see if the small
L.E.D. on the side of the proximity switch illuminates when the index cam follower
locates in front of the switch. If the L.E.D. does not illuminate, adjust the switch using
two 11/16” open-end wrenches until the L.E.D. illuminates.
5. A short circuit exists in the 24 VDC power supply on the press. Check the 1 amp fuse
with a continuity tester. The fuse holder will have wires #4 and #18 on it. Check for
24 volts DC with a volt meter across wires #3 and #4 in control box.
6. A print station proximity switch may have failed or may be shorted. Check for any
physical damage done to any of the proximity switches and their cable on the print
stations and replace as needed. Also look for any indication that the switch wire or
control cables may have been pinched in any way.
1. One or more print stations are selected for either “SINGLE” or “DOUBLE” print open
ation. Check to be sure all print station stroke switches are selected to the “OFF”
position.
2. The Emergency Stop push button has been activated. Pull “out” the red Emergency
Stop push button, and press the green “Reset” push button to resume operation.
3. There may be insufficient air pressure to the equipment (100 lbs. minimum per
square inch). Check to be sure that your compressor is turned “ON” and the shut-off
valve is open. Adjust the main air regulator to at least 100 lbs. minimum per square
inch.
4. The lift valve solenoid coil on the Mac valve may have failed. Remove the base
access cover on the indexer and manually activate the valve by pushing the white
over-ride/test button. If the indexer goes up and down the valve is fine. Locate wires
#2 and #Y42 and inspect the wires from the control box. Using a volt meter, they
should read 110 volts AC. If voltage is present, trace for broken or open/loose con-
nections. The test should be taken after pressing the print station start button.
1. The air cushion adjustments on the lift cylinders are mis-adjusted. To adjust the
cylinder cushions, remove the index base access covers and locate the allen screws
on the top of both lift cylinders. Insert Allen Wrench and turn both screws counter-
clockwise 1/4 turn or less to adjust the cushion.
2. The off-contact is set too low, or one or more screen frame holders may be striking
the pallets when the index table rises. Re-adjust the off-contact setting. The screen
frame should be adjusted so that there is at least 1/16” off-contact between the
frame and the material being printed. (On models equipped with the central off-con-
tact lever, set the lever for the required off-contact distance.)
1. The lift cylinder flow-controls may be mis-adjusted. Remove the index base access
cover and locate the lift cylinder Mac valve. The left flow control valve controls the
lifting of the indexer, the right controls the lowering. To increase the speed, turn the
knob counterclockwise. To slow the movement, turn the control knob clockwise.
2. The air pressure to the equipment is insufficient. Check to be sure you are getting
110 PSI to the equipment by checking the air regulator. As you operate the equip-
ment you should not see a pressure drop any greater than 5 PSI. If you do, check
your compressed air supply for restrictions or blockages.