200 Shadylane Drive
Philipsburg, PA 16866
Phone: (814) 342-6205
Fax: (814) 342-4510
www.druckerdiagnostics
Service Manual
Model 642E Centrifuge
CONTENTS
1PREFACE (3)
2GENERAL DESCRIPTION OF MAJOR COMPONENTS (3)
3WARRANTY INFORMATION (3)
4SPECIFICATIONS (3)
5TROUBLESHOOTING (4)
6SERVICE INSTRUCTIONS (5)
7WIRING DIAGRAM (10)
8FINAL CENTRIFUGE ASSEMBLY (11)
9CABINET ASSEMBLY (12)
10LOWER ASSEMBLY (13)
11BASE ASSEMBLY (14)
12MOTOR ASSEMBLY (15)
13REVISION HISTORY (16)
1PREFACE
1.1The purpose of this manual is to provide the service technician with information for
troubleshooting, testing, and repair of laboratory centrifuge model 642E. 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. The Drucker Company will not be held liable for any injury or damage as a result of
improper servicing.
1.2Information contained within this manual is subject to change without notice.
2GENERAL DESCRIPTION OF MAJOR COMPONENTS
2.1Motor: Permanent Split Capacitor AC Motor
2.2Printed Circuit Board: The PCB is the microcontroller based control center of the centrifuge. All
control signals are generated in the PCB.
2.3Lid 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.
2.4Rotor: 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.
3WARRANTY INFORMATION
3.1The Drucker Company warrants its centrifuges to be free from defects in workmanship and parts
for two years.
4SPECIFICATIONS
Maximum Speed  3380 RPM
Maximum RCF 1590 xg
Maximum Capacity    6 Tubes (17 x 100mm)
Dimensions (in) 9.0 (H) x 11.0 (W) x 12.5 (L)
Environmental Operating Range 2-40 deg C
Typical Noise Level (At Maximum Speed) < 65 dB A
Electrical Ratings 115VAC (+/- 10V)
5 TROUBLESHOOTING  PROBLEM POSSIBLE CAUSE SOLUTION The lid does not open. No Power Check line cord No Power Check circuit breaker on underside of centrifuge. No Power
Check wall outlet Lid knob is ajar
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 Lid tray is unplugged from PCB or defective Requires service PCB is damaged
Requires service
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, whether loaded, or empty. Debris lodged within the rotor or tube carriers Carefully inspect all rotor pockets, tube holders and crevasses for debris.  Centrifuge housing is loose Requires service Missing/damaged feet Requires service Motor failure Requires service Rotor damaged Replacement required    PROBLEM POSSIBLE CAUSE SOLUTION Rotor does not spin No Power Check line cord No Power Check circuit breaker on underside of centrifuge. No Power
Check wall outlet Lid not properly latched
Press down firmly on lid and rotate lid knob clockwise until the ‘LATCHED’ light illuminates. Internal connection failure Requires service PCB failure Requires service  Motor Failure Requires service    PROBLEM POSSIBLE CAUSE SOLUTION Clicking noise during braking Rotor is loose Tighten rotor nut per section 7-2    PROBLEM POSSIBLE CAUSE SOLUTION Whistling noise while running
Debris in air intake / exhaust ports  Remove power before clearing debris. Gasket failure Requires service Gasket failure Requires service
6SERVICE INSTRUCTIONS
6.1Cleaning
a)The cabinet, rotor top and accessories shall be thoroughly cleaned using soap and
water, isopropyl alcohol, or a mild bleach solution.
b)Under no circumstances should any of the following be used: Fully/Partially
Halogenated Hydrocarbons, Ketones and Esters.
c)Use of any chemicals not prescribed by the manufacturer may cause damage to the
rotor and tube carriers / holders and shall not be used.
6.2Removing the Rotor
a)Use a 1/2” nut driver to loosen the center rotor screw (turn counter-clockwise).
b)Lift the rotor straight up and out of the rotor chamber.
c)To install the rotor, reverse steps A and B above.
d)Take care to align the hub spines with the rotor hub.
e)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
a)Keep the rotor clean, any corrosive materials must not be allowed contact with the
rotor and should be cleaned immediately.
b)The rotor should be checked periodically for signs of wear.
c)Remove the rotor from service if any of the following are found: cracks, deep scratches,
corrosion or discoloring.
6.4Rotor Nut
a)If the rotor screw needs to be tightened, use a ½” nut driver and tighten it by hand until
snug.
b)Rule of thumb: One full thread showing above the nut is a good indicator of proper
installation.
6.5Speed Calibration
a)Check the centrifuge speed periodically, we recommend every two years.
b)Important: When verifying rotor speed, make certain that all tube holders are installed
service faultin the rotor.
c)No calibration adjustment of speed can be made, only a verification of rotor speed.
6.6Line Leakage
a)Check the centrifuge’s line leakage periodically, we recommend every two years.

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