MEDLINK USA, INC.

The World's Most Advanced Reconstructive Surgical Microscopes!

table of contents

DZ801 Reconstructive Surgical Microscope

Diagnostic Manual

Features

Specifications

Diagnostic Manual

Operating Instructions

Replacement Parts

INDEX:

• Power Check
• Illumination Systems Check
• Speed Control Check
• Fine Focus Check
• Zoom Check (A-Side)
• Zoom Check (B-Side)
• X-Y Check
• Focusing the Microscope
• Motorized Column Check

This troubleshooting guide will aid in determining the nature and severity of any 800 series microscope malfunction. This procedure is followed after build, repair, or service to evaluate the functional status of the instrument. It is the final check to ensure the instrument operates as designed and covers all mechanical motion and illumination. Check all functions and follow through all procedures, regardless of the reported problem. As the functional check is performed, record any remarks or results.

These checks and remedies will assist you in solving relatively minor problems, minimizing critical downtime and saving the expense of a service call. If, after completing the recommended diagnostics the problem persists, call the Medlink USA Service Department (800-762-7921) for assistance. Be near the microscope when calling so that any additional information can be tried immediately.

Figure 1 provides an overview of the microscope assemblies.

Power Check

Verify that the power cord is plugged into a wall outlet.

Check that the foot switches are connected to the power supply. Looking at the back cover on the Horizontal Arm, the center and right connections are for the foot switches. A or B can be plugged in either spot.

Turn on the power switch. Refer to Figure 2. The green pilot lamp should light. If not:

1. The circuit breaker feeding the outlet is in the "OFF" or "Tripped" position. Turn on or reset the circuit breaker.
2. The "L" or "N" fuse in the power supply is open. Turn off the microscope.
   1. Remove four Phillips screws from the back cover with a #2 Phillips screwdriver.
   2. Replace the fuse with one of EQUAL VALUE. Consult Fuse Legend for the correct value (fuse kits are available from Medlink USA).
   3. Replace the back cover.
3. If the microscope functions but the pilot light does not come on, then the power switch pilot light bulb is burned out. Although the microscope will function perfectly without it, the switch may be replaced so it lights up again.

1. X-Y Speed Control Knob
2. X-Y Center Button
3. X-Y Orientation Selector
4. Zoom Speed Control Knob
5. Focus Center Button
6. Focus Speed Control Knob
7. Column Up and Down Buttons
8. Power Switch with Indicator Light
9. Light Intensity Control Knob

Figure 2

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Verify that the Light Intensity control (Refer to Figure 2) varies the lamp brightness, and that the brightness plateaus at a dial setting higher than 4. This verifies the lamp driver adjustment. If the fiber optic light source (Refer to Figure 3) fails to light:

1. The bulb is burned out. Replace the bulb (available through the Customer Service Department, Catalog Number 937001).
   1. Remove slide-in lamp module from housing.
   2. Slide spare lamp module into housing for immediate use.
   3. Wait 15 minutes for the bulb to cool before handling.
   4. Pull bulb away from bulb holder. Do not touch inner bulb surface with bare hands since skin oils will shorten bulb life.
   5. Unplug bulb from socket and plug new bulb into socket.
   6. Put bulb into holder aligning tab with slot in holder.
   7. Re-install slide-in lamp module into housing or put spare module aside for future use.
2. Fuse #3 in the power supply is open. Turn off the microscope.
   1. Remove four Phillips screws from the back cover with a #2 Phillips screwdriver.
   2. Replace the fuse with one of EQUAL VALUE. Consult Fuse Legend for the correct value (fuse kits are available from Medlink USA).
   3. Replace the back cover.

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Speed Control Check

1. Using the foot switch, initiate an X-Y motion. As it moves, vary the speed control. The X-Y should slow down and speed up. Leave speed control on high for the remainder of the procedure.

2. Using the foot switch, initiate a Fine Focus motion. As the focus moves, vary the speed control. The Focus should slow down and speed up. Leave speed control on high for the remainder of the procedure.

3. Using a foot switch, initiate a Zoom motion. As it moves, vary the speed control. The Zoom should slow down and speed up. Leave speed control on high for the remainder of the procedure.

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Fine Focus Check

Using the foot switch, initiate a motion on the Fine Focus control. Run the focus to the end of travel. You should hear the motor stop promptly as the limit switch clicks.

If the microscope head fails to move up or down and the motor cannot be heard:

1. Depress foot switch several times in order to free a mechanical bind that may be present in the motor drive assembly.
2. Fuse #1 in the power supply is open. Turn off the microscope.
   1. Remove four Phillips screws from the back cover with a #2 Phillips screwdriver.
   2. Replace the fuse with one of EQUAL VALUE. Consult Fuse Legend for the correct value (fuse kits are available from Medlink USA).
   3. Replace the back cover.
3. Check foot switch cable for visible signs of trouble, i.e. broken or badly twisted insulating sheathing, both of which may indicate a broken conductor in the cable. Replace foot switch cable.
4. Faulty foot switch. We suggest that the foot switch be sent in for repair.

If the microscope head fails to move up or down and the motor can be heard, contact the Service Department for assistance.

Press Focus Center on the Control Panel. The carriage should return to center. Nudge it off center in the same direction again, but only for a second. Press Center again. It should return to center. Repeat this procedure in the other direction.

Check that the fine focus works on the foot switch, as well. The left control should move the carriage up, and the right control should move the carriage down.

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Zoom Check (A-Side)

Using a foot switch, run a zoom and watch the zoom ring rotate. The ring should move evenly, and not catch anywhere. At the end of travel, the motor should slow down audibly, but not stop or click. Run zoom to the other end of travel, and look for the same results. If it stops before end of travel, it must be readjusted by a trained technician in order to regain full range.

Verify that the zoom control of each A-side foot switch operates the A zoom. Verify that the left zoom control moves the ring to a higher number (zoom in). Verify that the right zoom control moves the ring to a lower number (zoom out).

1. If the zoom ring (Figure 5-D) fails to move and the zoom motor cannot be heard fuse #1 is open. Turn off the microscope.
   1. Remove four Phillips screws from the back cover with a #2 Phillips screwdriver.
   2. Replace the fuse with one of EQUAL VALUE. Consult Fuse Legend for the correct value (fuse kits are available from Medlink USA).
   3. Replace the back cover.
2. If the zoom ring (Figure 5-D) fails to move and the zoom motor can be heard: Contact the Service Department for assistance.

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Zoom Check (B-Side)

Repeat the Zoom Check (A-Side) procedure with Head B (Refer to Figure 5).

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X-Y Check

During this procedure, take care that X-Y rotation does not stretch the cables and fiber optics.

Using a foot switch, initiate a motion on the X-Y control. Run the X-Y to the end of travel. You should hear the motor stop promptly as the limit switch clicks.

Press X-Y Center on the Control Panel. The carriage should return to center. Nudge it off center in the same direction again, but only for a second. Press Center again. It should return to center. Repeat this procedure in the other direction. Repeat this procedure with each axis of the X-Y.

1. Set Selector switch to "N," and turn Carrier Arm so Praeger handle hole points down the short axis of the X-Y. Stand at the A side of the scope, and operate the X-Y with the foot switch. The upward control should move the carriage away. The downward control should move carriage closer. Left and right controls should operate intuitively. On some older models, the "N" position has the Praeger handle hole pointing away from the short axis. If all the X-Y controls work backwards, try pointing the carriage 180° from the normal position.
2. Set Selector to "L," and rotate Carrier so the Praeger handle hole points to the left as you look down the short axis. Repeat the tests of step 1 and verify intuitive operation for applicable X-Y controls.
3. Set Selector to "R," and rotate Carrier so Praeger handle hole points to the right as you look down the short axis. Repeat the tests of step 1, and verify intuitive operation for applicable X-Y controls.

If either X or Y function fails to operate and no motor noise is heard,

1. Check the electrical connections from the X-Y, the arm assemblies and from the foot switch to the power supply.
2. If the X-Y fails to move and the motor cannot be heard fuse #1 is open. Turn off the microscope.
   1. Remove four Phillips screws from the back cover with a #2 Phillips screwdriver.
   2. Replace the fuse with one of EQUAL VALUE. Consult Fuse Legend for the correct value (fuse kits are available from Medlink USA).
   3. Replace the back cover.

If either X or Y function fails to operate and motor noise is heard, there is a mechanical failure in the system. Because of the complicated nature of the X-Y, it is best at this point to contact the Service Department and report your findings.

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Focusing the Microscope

1. Set the Diopter Control rings to the "Zero" position (Refer to Figure 6-B).
2. Depress the zoom in switch until the highest magnification is achieved.
3. Now use the focus up or focus down switch until the object that you are focusing on is in sharp focus at center of field.
4. Once you have the object in sharp focus, depress the zoom out switch until the extreme low point of magnification is achieved.
5. Look through the eyepieces and adjust the diopter rings one at a time for sharp focus, if necessary to correct for any eye problems.
6. Once the microscope is properly focused, it will remain in focus throughout the entire range of zoom.

NOTE: If the user has to wear glasses to correct an astigmatism, it is suggested that they operate the microscope while wearing their glasses and using the high point eyepieces. Return to the highest point of magnification and refocus micorscope if necessary.

Due to the delicate nature of the microscope body itself, there are relatively few adjustments that can be performed in the field. Extreme care should be used when transporting this equipment, as the microscope is a delicate instrument.

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Motorized Column Check

With either column control, raise column until it stops. It should stop before top of column tube becomes visible below shroud. Run column down until it stops again. Motor should stop cleanly and be able to go back up easily from the lower limit. If a rattling or squeaking sound is heard, run the column up and down to the limits 5 times to spread the grease. If this does not solve the problem, column needs to be rebuilt by a trained technician. Use the other column control briefly to verify that it works.

If the column does not move:

1. Check the microscope cables for a loose connection at the Swivel Arm or cracked or broken wires.
2. If the column does not move but the head controls do work, check fuse #2 in the power supply which controls the column motor. Turn off the microscope.
   1. Remove four Phillips screws from the back cover with a #2 Phillips screwdriver.
   2. Replace the fuse with one of EQUAL VALUE. Consult Fuse Legend for the correct value Fuse kits are available from Medlink USA.
   3. Replace the back cover.
3. If the column does not move and the head controls do not work, check fuse #1 in the power supply. The column controls are on fuse #1 as are the head controls. Turn off the microscope.
   1. Remove four Phillips screws from the back cover with a #2 Phillips screwdriver.
   2. Replace the fuse with one of EQUAL VALUE. Consult Fuse Legend for the correct value. Fuse kits are available from Medlink USA.
   3. Replace the back cover.
4. If all fuses are O.K. and the microscope still does not move up or down, contact the Service Department for assistance.

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