Drucker Diagnostics 842VES User manual

DRUCKER DIAGNOSTICS SM001
MODEL 842VES SERVICE MANUAL REV D 1
200 Shadylane Drive
Philipsburg, PA 16866
Phone: [phone]
Fax: [phone]
www.druckerdiagnostics.com
Service Manual
Model 842VES Centrifuge

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MODEL 842VES SERVICE MANUAL REV D 2
CONTENTS
1PREFACE............................................................................................................................................ 3
2GENERAL DESCRIPTION OF MAJOR COMPONENTS ......................................................................... 3
3WARRANTY INFORMATION .............................................................................................................. 3
4SPECIFICATIONS................................................................................................................................ 3
5TROUBLESHOOTING ......................................................................................................................... 4
6SERVICE INSTRUCTIONS.................................................................................................................... 5
7WIRING DIAGRAM (115V MODEL) ................................................................................................. 12
8WIRING DIAGRAM (230V MODEL) ................................................................................................. 13
9FINAL CENTRIFUGE ASSEMBLY ....................................................................................................... 14
10 CABINET ASSEMBLY ........................................................................................................................ 15
11 LOWER ASSEMBLY .......................................................................................................................... 16
12 BASE ASSEMBLY.............................................................................................................................. 17
13 GUARD BOWL ASSEMBLY ............................................................................................................... 18
14 REVISION HISTORY.......................................................................................................................... 19

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MODEL 842VES SERVICE MANUAL REV D 3
1PREFACE
1.1 The purpose of this manual is to provide the service technician with information for
troubleshooting, testing, and repair of laboratory centrifuge model 842VES. 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 as a result of
improper servicing.
1.2 Information contained within this manual is subject to change without notice.
2GENERAL DESCRIPTION OF MAJOR COMPONENTS
2.1 Motor: Brushless DC Motor
2.2 Printed Circuit Board: The PCB is the microcontroller based control center of the centrifuge. All
control signals are generated in the PCB.
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.
3WARRANTY INFORMATION
3.1 Drucker Diagnostics warrants its centrifuges to be free from defects in workmanship and parts
for two years.
4SPECIFICATIONS
Standard 6-Place Horizontal Rotor (7786061) Performance Plus Rotor (7786017)
Maximum Speed 4,600 RPM 6,500 RPM
Maximum RCF 3,000 x g 5,000 x g
Maximum Capacity Six 13x75/100mm tubes Six 13x75mm Tubes
Dimensions (in) 8.25 (H) x 11.00 (W) x 13.75 (L) 8.25 (H) x 11.00 (W) x 13.75 (L)
Environmental Operating Range 2-40 deg C 2-40 deg C
Typical Noise Level (At Maximum Speed) < 70 dB A < 65 dB A
Electrical Ratings
115VAC Version 115VAC (+/- 10V) 115VAC (+/- 10V)
230VAC Version 230VAC (+/- 20V) 230VAC (+/- 20V)

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5TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE
SOLUTION
The lid does not open.
No Power
Check removable 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 removable 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 screw per section 7.4
PROBLEM
POSSIBLE CAUSE
SOLUTION
Whistling noise while running
Debris in air intake / exhaust ports
Remove power before clearing debris.
Gasket failure
Requires service
PROBLEM
POSSIBLE CAUSE
SOLUTION
Error message is displayed
‘OVRSPD’
Rotor speed is too great - Internal error
Service required
‘SPEED’
Rotor Speed is under set speed for too long.
Check power supply
Rotor Speed is under set speed for too long.
Check rotor – Missing carriers can reduce rotor speed in
some models. All carriers must be installed whether full or
empty.
Rotor Speed is under set speed for too long.
Check the lid and guard bowl gaskets. Voids in the rotor
chamber gaskets change the airflow, resulting in increased
stress on the motor drive.
Rotor speed is over set speed for too long
Service required
‘BALANC’
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.
Rotor damaged
Replacement required
‘ROTOR’
Software selection of rotor is unknown
Service Required – Call Drucker technical service.

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6SERVICE INSTRUCTIONS
6.1 Cleaning
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.
6.2 Removing the Rotor
a) Use a 1/8” hex key 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. Take care to align the hub spines
and/or shaft cross pin with the rotor hub. Tighten the rotor screw to 3.5 Nm.
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.
6.4 Rotor Screw
a) If the rotor screw needs to be tightened, use a 1/8” hex key and tighten to 3.5 Nm.
6.5 Speed Calibration
a) Check the centrifuge speed periodically, we recommend every two years.
b) Important: When verifying rotor speed, make certain that all carriers are installed in the
rotor.
c) No calibration adjustment of speed can be made, only a verification of rotor speed.
6.6 Line Leakage
a) Check the centrifuge’s line leakage periodically, we recommend every two years.
b) All Drucker centrifuges currently manufactured are classified as “laboratory equipment”,
per the requirements of UL 61010-1 Electrical Equipment for Measurement, Control and
Laboratory Use; Part 1: General Requirements. This standard specifies that the
maximum current levels between any accessible parts are as follows:
c) In normal condition the maximum current flow between accessible parts is 0.5mA RMS
for sinusoidal waveforms, 0.7mA peak for non-sinusoidal waveforms or mixed
frequencies, or 2mA DC.

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d) In single fault condition the maximum current flow between accessible parts is 3.5mA
RMS for sinusoidal waveforms, 5mA peak for non-sinusoidal waveforms or mixed
frequencies, or 15mA DC.
6.7 Ground continuity
a) Check the centrifuge’s ground continuity periodically, we recommend every two years.
b) Disconnect the manufacturer’s supplied power cord from the power supply.
c) Measure the resistance between the ground tab of the line cord and an exposed, clean,
unpainted metal surface contiguous to the chassis main frame.
d) The maximum acceptable ground resistance is 0.1 Ohms.
6.8 Removing the Cabinet (Upper Housing)
a) There are eight screws that fasten the centrifuge cabinet to the base.
b) Begin by unplugging the centrifuge, and waiting 10 minutes for internal voltages to
dissipate.
c) Use a #2 Phillips screwdriver to remove the cabinet screws (three on left and right sides,
two in the rear)
d) The cabinet control panel is attached to the base internally with cable harnesses. Be
careful not to stress the cables when removing the cabinet.
e) Stand directly in front of the centrifuge and lift the cabinet straight up and off the base,
setting it down on its right side.
f) Gently remove the power supply and motor harnesses from the PCB.
a) Use a Volt meter to measure the DC voltage across the power supply capacitor.
IMPORTANT: Do not continue until the voltage is below 0.5 V DC. See fig 4
Fig 4
b) Once the voltage is below 0.5 V DC short the capacitor with a screwdriver. See fig 5

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Fig 5
c) Service may continue once the capacitor is drained.
6.9 Replacing the Lid Tray Assembly
a) The lid tray assembly is accessible once the cabinet has been removed.
b) Gently remove the lid tray wire harness from the PCB.
c) 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.
d) Early models used a plastic spacer between the tray assembly and the metal cabinet. A
spacer is no longer needed. IMPORTANT: Remove any plastic spacer that may be
present.
e) To install the lid tray, slide it onto the studs, and secure it with two #6 Nylok nuts, hand
tight.
f) Complete the installation by gently plugging the wire harness into the PCB header ‘J4’.
The header and connector are keyed for proper orientation.
6.10 Replacing the PCB
a) The PCB is accessible once the cabinet has been removed. Make certain that all wire
harnesses have been disconnected. Use standard precautions for handling static
sensitive components.
b) The PCB is held in place with nine #6 Nylok nuts and plastic insulator washers. Use a
5/16” nut driver to remove the nuts. The PCB and washers are now free to slide off the
threaded studs.
c) Beneath the PCB are seven plastic standoffs. If they are crushed, replace them before
reassembly.
d) To install the PCB, make certain that seven plastic standoffs and two rubber spacers are
present on the control panel studs.

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e) Slide the board onto the studs
f) Install seven plastic washers onto the studs securing the circuit card.
g) Install two conventional #6 washers onto the heat sink studs.
h) Important: Secure the heat sink side of the PCB first, and tighten the Nylok nuts until the
stud protrudes past the Nylok Nut by only one thread.
i) Important: over tightening the PCB nuts will cause malfunction – Each nut sets the
height of a separate control panel switch. Too low, and they cannot be actuated, too
high and they jam against the front panel label, and are always in the ‘ON’ state.
j) The remaining 7 nuts should be tightened only until the buttons on the control panel
click when pressed – do not over tighten. Each nut sets the height of a separate control
panel button. Tighten each nut a ¼ turn in succession, trying each corresponding button
as you go.
k) Once each control panel button clicks when pressed, installation is complete.
IMPORTANT: Do not connect the power supply to the PCB yet. Follow the instructions
in section 6.13
6.11 Removing the motor
a) Remove the cabinet assembly by following 6.8
b) Cut and remove all wire harness zip ties.
c) Flip the base assembly up-side down and remove the three exhaust air channel screws
with a #2 Phillips driver.
d) Set the exhaust cover aside
e) The guard bowl is held in place with six #8 screws. Remove them with a #2 Phillips
driver.
f) Lift the base assembly off of the guard bowl and set it aside.
g) Flip the guard bowl.
h) The motor is held in place with 4 #8 Nylok nuts. Remove them with an 11/32” nut
driver.
i) Slide the motor and motor gasket out of the guard bowl’s motor well.
6.12 Replacing the motor
a) Make certain that a new gasket is used when installing a motor.
b) Locate the seam on the inside of the guard bowl wall.
c) Position the motor so its wires exit approx 180 deg away from the guard bowl seam.
d) Install the motor and gasket into the guard bowl with the wire harness positioned as
described above.

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e) Drive 4 #8 Nylok nuts onto the motor studs with an 11/32” nut driver.
f) Turn the guard bowl assembly upside down with the guard bowl seam facing you.
g) Place the base assembly (with transformers facing you) onto the guard bowl.
h) IMPORTANT: Make certain that no wires are pinched between the guard bowl and
base!
i) IMPORTANT: Tuck a portion of the motor wire harness into the rectangular cutout in
the base. See fig 1.
Figure 1
j) IMPORTANT: Make certain that the base assembly wires are routed between the base
and the threaded screw inserts. See fig 2.
Figure 2

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MODEL 842VES SERVICE MANUAL REV D 10
k) Fasten the guard bowl to the base with six each #8 screw, washer and lock washers.
l) Install the exhaust air cover with 3 each #8 screw, washer and lock washers. Make
certain that the motor wire harness is contained within the cover’s wire channel. See fig
3.
Fig 3
m) Replace the zip tie removed in 6.11
n) The lower assembly is complete.
6.13 Power Connections and Final Assembly
IMPORTANT: These steps must be followed to avoid personal harm and to avoid
damaging the PCB.
d) Make certain that the lower assembly has been unplugged from the mains supply for at
least 10 minutes.
e) Use a Volt meter to measure the DC voltage across the power supply capacitor.
IMPORTANT: Do not continue until the voltage is below 0.5 V DC. See fig 4
Fig 4

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f) Once the voltage is below 0.5 V DC short the capacitor with a screwdriver. See fig 5
Fig 5
g) Connect the power leads to the PCB. The positive lead (red) goes to ‘J10’ Negative
(black) lead goes to ‘J11’
h) Connect the two motor connectors to ‘J2’ and ‘J12’ on the PCB.
IMPORTANT: Remove the screwdriver before continuing
i) Carefully place the cabinet onto the base taking care not to pinch any wires between the
two.
j) Complete the assembly by replacing the eight #8 screws, washers and lock washers with
a #2 Phillips driver.

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7WIRING DIAGRAM (115V MODEL)

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8WIRING DIAGRAM (230V MODEL)

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9FINAL CENTRIFUGE ASSEMBLY

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10 CABINET ASSEMBLY
ITEM NO.
PART NUMBER
DESCRIPTION
QTY.
1
7710179
842VES CABINET, POWDER COATED
1
2
3023001
NUT INSERT, 8-32 THREAD
4
3
3051001
STUD, 6-32 x 7/8
4
4
3051003
STUD, 6.32 x 0.625
7
5
7732018
MOTOR WELL GASKET
1
6
7745017
LID TRAY ASSEMBLY
1
7
3022002
NUT, 6-32, NYLOK, SILVER
9
8
3003002
STANDOFF, 0.320 x 0.203, 642 BOARD MOUNT
7
9
7728102
755 GROMMET, HEAT SINK MOUNT
2
10
3033002
WASHER, # 6 FLAT NYLON, WHITE
7
11
7713007
0.062" KYDEX HINGE SPACER
2
12
7713003
HINGE SPACER
2
13
7724071
FRICTION HINGE
2
14
3012009
SCREW, 8-32 x 1.00, PAN HEAD, PHILLIPS, SILVER
4
15
02-002-1-0002
842 LID ASSEMBLY
1
16
3012004
SCREW, #6 x 0.375, PH/PHIL, SELF TAP, BLUNT, SILVER
4
17
OEM SPECIFIC
LABEL, STOP
1
18
OEM SPECIFIC
LABEL, OPEN/CLOSE, FRENCH/ENGLISH
1
19
OEM SPECIFIC
UNLOCKING INSTRUCTION LABEL
1
20
3033003
WASHER #8, FLAT, SILVER
2
21
3022003
8/32 NYLOCK NUT
2
22
7717041
VES PCB ASSEMBLY
1

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11 LOWER ASSEMBLY
ITEM NO.
PART NUMBER
DESCRIPTION
QTY
1
02-006-1-0025
842VES GUARD BOWL & MOTOR ASSEMBLY
1
2
7732019
642/842 GASKET, ROTOR CHAMBER
1
3
OEM SPECIFIC
842VES BASE ASSEMBLY
1
4
3033003
WASHER #8, FLAT, SILVER
9
5
3033001
#8 SPLIT LOCK WASHER
3
6
3012007
SCREW, PHILLIPS, 8-32, 0.50 LONG
9
7
7732009
EXHAUST GASKET
2
8
7713027
614/642/643/755 EXHAUST AIR DEFLECTOR
1
9
3081016
DISCONNECT, 0.25", FEMALE, YELLOW
4
10
3081011
TERMINAL, RING, 12-10 AWG
4
11
3081002
DISCONNECT, 0.25", FEMALE, RED
7
12
03-1-0005-0017
TERMINAL, RING, 14 16 AWG, #6
3
13
3033005
WASHER, #6, INTERNAL TOOTH
1
14
3021001
NUT, 6-32 HEX SILVER
1

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12 BASE ASSEMBLY
ITEM NO.
PART NUMBER
DESCRIPTION
QTY
1
03-1-0002-0034
842 BASE, FLANGED
1
2
3023001
NUT INSERT, 8-32 THREAD
19
3
3051003
STUD, 6.32 x .625
4
4
3003007
SPACER, LINE FILTER, ALUMINUM
2
5*
7751041*
642/755 LINE FILTER*
1
5**
7751042**
642/755 LINE FILTER 230V**
1
6
3022002
NUT, 6.32, NYLOK, SILVER
3
7
7729003
842VES/853VES/755VES BRIDGE RECTIFIER
1
8
7724177
SUCTION FOOT, BLACK NITRILE
4
9
3033017
Washer, Shoulder
4
10
3012032
Screw, 8.32 SLHCS x 1/2" Long Black
4
11
7729004
842VES/853VES/755VES POWER SUPPLY CAPACITOR
1
12
7751043
BREAKER, 4A
1
13
3022005
NUT, M8, NYLOK, SILVER
1
14*
3056001*
755/842 TRANSFORMER, 115V TO 12V*
2
14**
3056003**
755/842 TRANSFORMER, 115V TO 12V**
2
15
3033003
WASHER #8, FLAT, SILVER
4
16
3033001
#8 SPLIT LOCK WASHER
4
17
3012006
SCREW, 8-32 x 0.375, PAN HEAD PHILIPS, SILVER
4
18
7724002
LABEL, GROUND
1
* ONLY USED IN 115V CENTRIFUGES
** ONLY USED IN 230 V CENTRIFUGES

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13 GUARD BOWL ASSEMBLY
ITEM NO.
PART NUMBER
DESCRIPTION
QTY.
1 7710175 842VES GUARD BOWL, POWDER COATED 1
2
3023001
NUT INSERT, 8-32 THREAD
6
3
7735013
842VES MOTOR, BRUSHLESS DC, STAT
1
4
3051006
MOTOR STUD, 8-32 X .75 CRIMPED
4
5
03-1-0012-0016
ROLL PIN, 0.1875 X 0.75
1
6
7786006
ROTOR CONE
1
7
7728050
755 MOTOR GASKET
1
8
3022003
8/32 NYLOCK NUT
4

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14 REVISION HISTORY
Revision #
Date
Details of Change
Original
06/27/2013
Original Issue - DR-2944.
A
07/18/2013
Added 230V wiring diagram - DR-2958
B
09/22/2015
Updated hex key size and final assembly drawing