Advanced Instruments OsmoTECH PRO Manuel utilisateur

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222104PM Rev 0

Replacement Procedure 222104PM

OsmoTECH®PRO Sample Probe

Motor

Scope

This document describes how to replace the sample

probe motor (p/n 222104R) on the OsmoTECH® PRO

Multi‑Sample Micro‑Osmometer. It is intended for use in

conjunction with service procedures that require access

to the OsmoTECH PRO interior.

Tools required

• #1 and #2 Phillips screwdrivers

• 1/4“ and 5/16” nut driver

• 0.050”, 3/32”, and 9/64” Allen wrenches

• 30 µL sample tube

• Static grounding wrist strap

Parts and materials required

Replacement part 222104R

Related documents

• OsmoTECH PRO Disassembly and Reassembly

(p/n 222202PM)

• OsmoTECH PRO Service Guide (p/n 222006EN)

Safety notices

WARNING: Hazardous Voltage. Power cord must

be disconnected to prevent electrical shock.

NOTICE: Internal components may be damaged

by static electricity. A static grounding wrist

strap must be worn during this procedure.

NOTICE: Improper connections may cause

damage to the instrument.

Disconnecting the control PCB

1. Disassemble the instrument by performing the

disassembly instructions in OsmoTECH PRO

Disassembly and Reassembly.

2. Remove the cable clamp [A] that secures the C10

sample probe cable and the C11 block probe cable

to the side of the power supply and controls

assembly.

3. Unplug the C10 and C11 connectors from the control

PCB.

4. Unplug the B1, B2, B3, B4, B6, B7, B8, B9, and B10

connectors on the motor/sensor cable harness from

their mating connectors.

5. Disconnect the A1, A2, A3, and A4 connectors on

the cooling system harness from their mating

connectors.

Replacement Procedure

OsmoTECH® PRO Sample Probe Motor

Page 2 222104PM Rev 0

Removing the power supply and controls

assembly

1. Rest the instrument on its back side.

2. Remove the two screws [B] that secure the power

supply and controls assembly to the bottom of the

chassis.

3. Place the instrument in the upright position.

4. Remove the two screws that secure the power

supply and controls assembly to the rear of the

chassis.

5. Slide the power supply and controls assembly out

of the base assembly.

Removing the osmometer module

1. Remove the four socket head cap screws and

washers [D] that mount the osmometer module

mounting bracket to the chassis.

2. Carefully slide the module out of the instrument.

3. Remove the hex nut and washer [E] that secures

the SPG and BPG ring terminals to the side of the

osmometer module mounting bracket.

4. Remove the four socket head cap screws and

washers [F] that mount the osmometer module to

the osmometer module mounting bracket (which

is secured to the chassis).

5. Lift the osmometer module o of the osmometer

module mounting bracket.

Replacement Procedure

OsmoTECH® PRO Sample Probe Motor

Page 3 222104PM Rev 0

Removing the sample probe motor

1. Remove the sample probe motor’s wire leads from

the two cable clamps [E] and the three cable clips

[F].

2. Remove the hex nut and washer [G] that secure the

sample probe motor’s lead‑screw to the top of the

osmometer module top plate.

3. Hold the movable plate that secures the body of the

sample probe motor and remove the set‑screw [H]

from each side of the osmometer module top plate.

Keep hold of the movable plate once the set‑screws

are removed to prevent the plate from dropping.

4. Gently lower the movable plate until it rests on top

of the stripper bracket.

5. Remove the two socket head cap screws [I] and

washers that mount the sample probe motor to the

movable plate.

Replacing the sample probe motor

Refer to Removing the sample probe motor for images

and callouts.

1. Secure the replacement sample probe motor to the

movable plate using the two socket head cap

screws and washers [I].

2. Lift the movable plate until the adapter on the end

of the sample probe motor’s lead‑screw enters the

osmometer module top plate and the adapter’s

threads are extending beyond the top of the plate.

3. Secure—but do not fully tighten—the adapter

threads with the hex nut and washers [G].

4. Partially thread the two set‑screws [H] into the

sides of the osmometer module top plate.

5. Lift the movable plate that secures the sample

probe motor until the lead‑screw’s adapter is

properly positioned inside the osmometer module

top plate.

6. Hold the movable plate and tighten the two set‑

screws [H].

7. Tighten the hex nut to secure the adapter’s threads

[G].

If the sample probe motor’s lead‑screw turns as the

nut is being tightened, then the two sets‑screws are

not tight enough.

Replacement Procedure

OsmoTECH® PRO Sample Probe Motor

Page 4 222104PM Rev 0

8. Lift and lower the movable plate several times to

make sure that there is no binding, etc.

9. Secure the sample probe motor’s wire leads with

the two cable clamps [E] and the three cable clips

[F].

Make sure that there is a service loop [L] between

the body of the motor and the ﬁrst cable clamp.

Replacing the osmometer module

Refer to Removing the osmometer module for images

and callouts.

1. Slide the osmometer module into the instrument.

2. Secure the osmometer module to the mounting

bracket using the four socket head cap screws and

washers [D].

Replacing the power supply and controls

assembly

Refer to Removing the power supply and controls

assembly for images and callouts.

1. Slide the power supply and controls assembly into

the base assembly.

2. Secure the power supply and controls assembly to

the rear of the chassis with the two screws [C].

3. Place the instrument on its back side.

4. Secure the power supply and controls assembly to

the bottom of the chassis with the two screws [B].

Reconnecting the control PCB

1. Place the instrument in an upright position.

2. Plug the A1, A2, A3, and A4 connectors on the

cooling system harness into their mating

connectors.

3. Plug the B1, B2, B3, B4, B6, B7, B8, B9, and B10

connectors on the motor/sensor cable harness into

their mating connectors.

4. Plug the C10 and C11 connectors into the control

PCB.

5. Secure the C10 sample probe cable and the C11

block probe cable to the side of the power supply

and controls assembly with the cable clamp and

screw [A].

6. Reassemble the instrument by performing the

reassembly instructions in OsmoTECH PRO

Disassembly and Reassembly.

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