Drucker Diagnostics 642M User manual

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642M SERVICE MANUAL
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200 Shadylane Drive
Philipsburg, PA 16866
www.druckerdiagnostics.com
Service Manual
642M CENTRIFUGE

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Contents
1. PREFACE 3
2. GENERAL DESCRIPTION OF MAJOR COMPONENTS 3
3. WARRANTY INFORMATION 3
4. SPECIFICATIONS 3
5. TROUBLESHOOTING 4
6. SERVICE INSTRUCTIONS 5
7. WIRING DIAGRAM 9
8. SPARE PARTS LIST 10

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1. PREFACE
1.1. The purpose of this manual is to provide the service technician with information for
troubleshooting, testing, and repair of laboratory centrifuge model 642M. Only qualified
technically trained personnel should attempt any of the servicing described in this
document. Failure to follow the procedures in this document may result in personal
injury or instrument damage. Drucker Diagnostics will not be held liable for any injury or
damage because of improper servicing.
1.2. Information contained within this manual is subject to change without notice.
2. GENERAL DESCRIPTION OF MAJOR COMPONENTS
2.1. Motor: Brushed DC
2.2. Control Board: The control board is the microcontroller-based control center of the
centrifuge. All control signals are generated in the control board.
2.3. Lid Locking Tray Assembly: The lid tray assembly contains a solenoid and limit switch that
are used to determine the state of the lid (Open or Closed) and to keep the lid locked
during centrifugation cycles.
2.4. Rotor: The centrifuge rotor is the main component that spins in the centrifuge. The rotor
is loaded with tube holders, and the samples are placed into the tube holders for
processing.
3. WARRANTY INFORMATION
3.1. Drucker Diagnostics warrants its centrifuges to be free from defects in workmanship and
parts for two years.
4. SPECIFICATIONS
Nominal Speed
3400 RPM (+/- 175)
Nominal RCF
1650 xg
Nominal Voltage
13.8V
Maximum Capacity
6 Tubes (17 x 100mm)
Dimensions (in)
9.0 (H) x 12.0 (W) x 14 (L)
Environmental Operating Range
2-35 deg C
Typical Noise Level (At Maximum Speed)
< 65 dB A
Electrical Ratings
12 - 24 VDC

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5. TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE
SOLUTION
The lid does not open.
No power
•Check line cord
•Check fuse in end of line cord.
Lid knob is not completely closed
Rotate the lid knob fully clockwise before pressing
the ‘OPEN’ button
Lid lock is active (Unlock timed out)
Press the ‘OPEN’ button to de-activate the lid lock
Lid tray is unplugged from control board or
defective
Check wiring
Control board is damaged
Replace Control board
To gain access to the rotor - Remove the
‘OPEN/CLOSE’ sticker and slide the lid latch lever
toward the front of the centrifuge. This will unlock
the lid.
PROBLEM
POSSIBLE CAUSE
SOLUTION
Excessive vibration
Rotor improperly loaded
Load equally filled tubes symmetrically in the rotor.
All carriers and/or tube holders must be present in
the rotor.
Debris lodged within the rotor or tube
carriers
Carefully inspect all rotor pockets, tube holders and
crevasses for debris, and clean thoroughly.
Centrifuge housing is loose
Tighten or replace screws
Missing/damaged feet
Replace feet
Motor failure
Replace motor
Rotor damaged
Replace rotor
PROBLEM
POSSIBLE CAUSE
SOLUTION
Rotor does not spin
No Power
•Check line cord
•Check fuse in end of line cord.
Lid not properly latched
Press down firmly on lid and rotate lid knob clockwise
until the ‘LATCHED’ light illuminates.
Internal connection failure
Check wiring
Control board failure
Replace control board
Motor Failure
Replace motor
PROBLEM
POSSIBLE CAUSE
SOLUTION
Clicking noise during braking
Rotor is loose
Tighten rotor nut
PROBLEM
POSSIBLE CAUSE
SOLUTION
Whistling noise while running
Debris in air intake / exhaust ports
Remove power before clearing debris.
Damaged gasket
Requires service
PROBLEM
POSSIBLE CAUSE
SOLUTION
Rotor speed is lower than
specified range
Rotor speed is calibrated at 13.8 VDC
Confirm source voltage meets or exceeds this value.
Motor speed will vary according to source voltage.

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6. SERVICE INSTRUCTIONS
6.1. Cleaning
•The cabinet, rotor and accessories can be cleaned using soap and water, isopropyl
alcohol, or a 10% (5500 PPM) bleach solution
•Apply cleaning solutions with a towel or cloth. Do not submerge the centrifuge in
water or other cleaning solutions as this will cause damage and void the warranty.
•Under no circumstances should any of the following be used: TBQ Germicidal
Products, Fully/Partially Halogenated Hydrocarbons, Ketones or Esters.
•Use of any chemicals not prescribed by the manufacturer may cause damage to the
rotor and tube carriers and shall not be used.
6.2. Removing the Rotor
•Use a 1/2” nut driver to loosen the center rotor screw (turn counter-clockwise).
•Lift the rotor straight up and out of the rotor chamber.
•To install the rotor, reverse steps A and B above.
•Take care to align the hub spines with the rotor hub.
•Tighten the rotor nut by hand with a ½” nut driver until snug. A good rule of thumb
is one full thread showing above the nut is a good indicator of proper installation.
6.3. Maintaining the Rotor
•Keep the rotor clean, any corrosive materials must not be allowed contact with the
rotor and should be cleaned immediately.
•The rotor should be checked periodically for signs of wear.
•Remove the rotor from service if any of the following are found: cracks, deep
scratches, corrosion or discoloring.
6.4. Rotor Nut
•If the rotor nut needs to be tightened, use a ½” nut driver and tighten it by hand
until snug.
•Rule of thumb: One full thread showing above the nut is a good indicator of proper
installation.
6.5. Speed Calibration
•Check the centrifuge speed periodically, every two years is recommended.
•Important: When verifying rotor speed, make certain that all carriers are installed
in the rotor.
•No calibration adjustment of speed can be made, only a verification of rotor speed.
6.6. Removing the Cabinet (Upper Housing)
•There are nine screws that fasten the centrifuge cabinet to the base.
•Begin by unplugging the centrifuge and waiting 10 minutes for internal voltages to
dissipate.
•Use a #2 Phillips screwdriver to remove the cabinet screws (six on the bottom,
three in the rear)

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•The centrifuge control panel is attached to the base internally with cable
harnesses. Be careful not to stress the cables when removing the cabinet.
•Lift the cabinet straight up and off the base, setting it down on its front side.
•Gently remove the combination power supply / motor harness from the control
board.
6.7. Replacing the Lid Lock Assembly
•The lid locking tray assembly is accessible once the cabinet has been removed.
•Gently remove the lid tray wire harness from the PCB.
•The lid tray assembly is held in place with two #6 Nylok nuts. Use a 5/16” nut driver
to remove the nuts. The tray will slide off the threaded studs.
•To install the lid tray, slide it onto the studs, and secure it with two #6 Nylok nuts,
hand tight.
•Complete the installation by gently plugging the wire harness into the PCB header
‘J1’.
6.8. Replacing the Control Board
•The control board is part of the front panel assembly and is accessible once the
cabinet has been removed. Make certain that all wire harnesses have been
disconnected.
•The control board has capacitors that will remain charged for a period after the
centrifuge is unplugged. Make certain to use standard precautions for handling
potentially charged capacitors when working with the control board.
•The front panel assembly is held in place with ten locking tabs (fig 1).
•Push the tabs inward to release the assembly.
•To install the front panel assembly, push it into the opening in the cabinet until it
snaps into place.
Figure 1

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6.9. Removing the motor
•Remove the cabinet assembly as previously described.
•Flip the base assembly up‐side down and remove the six screws that hold the
guard bowl
•Lift the base assembly off the guard bowl and set it aside
•Cut the motor wires at the crimp connectors (where the motor connects to the
wire harness 02-006-1-0050).
•Flip the guard bowl.
•The motor is held in place with four #8 Nylok nuts. Remove them with an 11/32”
nut driver.
•Slide the motor out of the guard bowl’s motor well.
6.10. Replacing the motor
•Flip the guard bowl upside down and locate the notch on the bottom.
•Install the motor into the guard bowl with the wires facing in the same direction as
the notch.
•Holding the motor in place, flip the bowl on its side and drive 4 #8 Nylok nuts onto
the motor studs with an 11/32” nut driver.
•Turn the guard bowl assembly upside down and position the bowl so the notch is in
an 8 o’clock position.
•Place the base assembly onto the guard bowl –make sure the orientation of the
motor wires is the same as the image below.
•Make certain that the motor wires are in the notch, and that no wires are pinched
between the guard bowl and base.
•Fasten the guard bowl to the base with the six screws and connect the wires as
shown in the wiring diagram.

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6.11. Power Connections and Final Assembly
•Connect all wiring harnesses to the control board as shown in the wiring diagram.
•Carefully place the cabinet onto the base taking care not to pinch any wires
between the two.
•Complete the assembly by replacing the six screws in the bottom and three in the
rear.

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7. WIRING DIAGRAM

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8. SPARE PARTS LIST