KM-602｜24V Power Supply Inspection and Replacement Guide

1. Printer Power Module Overview

The printer uses several power modules. Each power module supplies a different system. The 24V Power Supply is the independent power supply for the white ink system. It provides a DC output of 24 V.

1-Location-Of-The-Power-Modules

1.1 Other Independent Power Modules (Not Covered in This Guide)

This guide applies only to the 24V Power Supply. The Multi-Output Power Module supplies the mainboard, the carriage board, the X-axis motor, the Y-axis motor, the screen driver board and the cooling fan. For the Multi-Output Power Module, refer to the KM-602｜Multi-Output Power Module Inspection and Replacement Guide.

2. 24V Power Supply Wiring Diagram

2-24V-Power-Supply-Wiring-Diagram

In this guide, ①–⑤ always refer to the numbers in Fig. 2.

3. Fault Inspection Procedure (Check AC First, Then DC)

⚠ Important: If the external AC input (①②) has no power, the DC output of the 24V Power Supply (④⑤) reads 0 V. This reading is normal. This reading does not mean that the 24V Power Supply has failed. Always check the AC input first. Check the DC output after that.

3.1 Safety Instructions

• Measure the voltages with the printer powered on.
• Disconnect all power before you replace the 24V Power Supply.
• Wait 1 minute after you unplug the power cord. Then start to disconnect the cables.
• Wear insulated gloves. Do not touch exposed circuits with your hands.

3.1-Turning-On-The-MAIN-POWER-Switch

3.2 AC Input Check (①–②)

Multimeter mode: ACV 600 V. On an auto-ranging multimeter, select ACV.

Measurement method:

• Red probe → ① live
• Black probe → ② neutral

3.2-Measuring-The-AC-Input-Of-The-24V-Power-Supply

Normal value: AC 200–240 V

The 24V Power Supply receives AC power. Go to 3.3 and check the DC output.

Abnormal value: 0 V, or the reading is unstable

This is not a 24V Power Supply fault. Check the following items in the given order:

1. No power at the wall socket
2. PROTECTION SWITCH tripped
3. MAIN POWER switch not turned on
4. Top power switch not turned on
5. Loose AC cable
6. Loose or oxidized terminals
7. Broken AC cable

3.3 DC Output Check of the 24V Power Supply (④–⑤)

Multimeter mode: DCV 200 V. On an auto-ranging multimeter, select DCV.

Measurement method:

• Black probe → ④ 24 V negative
• Red probe → ⑤ 24 V positive

3.3-Measuring-The-DC-Output-Of-The-24V-Power-Supply

3.3.1 DC Output Evaluation and Actions

3.3-2-Normal-DC-Output-Of-The-24V-Power-Supply

3.3-3-Abnormal-DC-Output-Of-The-24V-Power-Supply

3.3.2 Input Voltage Check at the White Ink Circulation Pump / White Ink Stirring Motor

Multimeter mode: DCV 200 V. On an auto-ranging multimeter, select DCV.

Measurement method:

• Black probe → negative input terminal of the pump or the stirring motor
• Red probe → positive input terminal of the pump or the stirring motor

3.3-4-Measuring-The-Input-Voltage-At-The-Pump-And-Motor

Do not replace the 24V Power Supply if the fault is in the cable, or in the pump, or in the stirring motor. The task in this guide is complete.

4. 24V Power Supply Replacement

Precondition: Perform this section only after 3.3.1 shows that the 24V Power Supply has an internal fault.

4.1 Power Off

1. Press the top power switch to turn off the printer. （See Fig. 4.1-1）
2. Turn off the MAIN POWER switch at the rear of the printer. （See Fig. 4.1-2）
3. Unplug the power cord.
4. Wait 1 minute. Then start to disconnect the cables.

4.1-1-Top-Power-Switch-Of-The-Printer

4.1-2-Turning-Off-The-MAIN-POWER-Switch

4.2 Remove the Old 24V Power Supply

4.2.1 Remove the Back Panel

1. Gently pry out the white plastic cover plugs on both sides of the back panel.
2. Unplug the network cable.（See Fig. 4.2-1）
3. Remove the screws of the back panel. （See Fig. 4.2-2）
4. Disconnect the cooling fan cable. Remove the back panel. （See Fig. 4.2-3）

4.2-1-Removing-The-Plastic-Cover-Plugs-And-The-Network-Cable

4.2-2-Removing-The-Screws-Of-The-Back-Panel

4.2-3-Disconnecting-The-Cooling-Fan-Cable

4.2.2 Disconnect the Cables

1. Photograph the wiring while every cable is still connected. Use the photograph to reconnect each cable correctly. （See Fig. 4.2-4）
2. Loosen the terminal screws ①–⑤ in order. Follow Fig. 2.
3. Pull out the cables one by one.

4.2-4-Wiring-Record-Of-The-24V-Power-Supply

4.2.3 Remove the Fixing Screws

1. Remove the fixing screw ①.
2. Loosen the locating screw ②. See Fig. 4.2-5.
3. Remove the old 24V Power Supply. See Fig. 4.2-6.

4.2-5-Removing-The-Fixing-Screw-And-Locating-Screw

4.2-6-The-Removed-24V-Power-Supply

4.3 Install the New 24V Power Supply

4.3.1 Confirm the Model

Compare the model labels on the new and old 24V Power Supplies. Confirm that both models are the same.

4.3.2 Mount the 24V Power Supply

1. Align the mounting holes. Fit the 24V Power Supply onto the fixing screw positions.
2. Tighten the fixing screw and the locating screw. （See Fig. 4.2-5）

4.3.3 Connect the Cables

1. Connect the cables ①–⑤ in order. Follow Fig. 2.
2. Confirm that every cable is pushed fully into place.
3. Compare the wiring with the photograph from 4.2.2. Confirm that every cable is in the correct position. Confirm that no cable is loose.
4. Tighten all terminal screws.

4.3.4 Reinstall the Back Panel

1. Connect the cooling fan cable. （See Fig. 4.2-3）
2. Align the back panel. Install the back panel. Tighten the screws. （See Fig. 4.2-2）
3. Plug in the network cable. （See Fig. 4.2-1）
4. Install the white plastic cover plugs on both sides.

5. Power-On Check

5.1 Check all cables again for loose connections and for reversed connections.

5.2 Plug in the power cord. Turn on the MAIN POWER switch at the rear of the printer. (See Fig. 3.1)

5.3 Press the top power switch. The indicator light turns on. (See Fig. 5.3)

5.3-Pressing-The-Top-Power-Switch-Top-View

5.4 Final Status Confirmation

After all cables are connected and the printer is powered on, confirm the following three items:

1. The indicator light of the 24V Power Supply stays on.
2. The reading at ④–⑤ is 23–25V. Use the multimeter in DCV 200 V mode.
3. The white ink circulation pump and the white ink stirring motor run again.

✅ Normal: All three items are met. The replacement is complete. (See Fig. 5.4-1)

5.4-1-Normal-Status-After-Replacement

❌  Abnormal: The indicator light is off, or the indicator light flashes abnormally, or the reading is 0.0 V. （See Fig. 5.4-2）

5.4-2-Abnormal-Status-After-Replacement

Check the wiring again. If the wiring is correct and the reading is still abnormal, contact LINKO technical support.

⚠ The voltage is normal, but the pump or the stirring motor still does not work: the fault is not in the 24V Power Supply. Return to 3.3.2 and measure the input voltage at the pump and the stirring motor.

LINKO Technical Support
Email: support@dtflinko.com
Website: www.dtflinko.com

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