KM-602｜Multi-Output Power Module Inspection and Replacement Guide

Applicable Model: LINKO KM-602 DTF Printer

When to Use This Guide: Use this guide in either of the following cases:

  • The printer does not power on at all.
  • One of the following components does not work: X-axis motor, Y-axis motor, cooling fan, screen, carriage board, mainboard.

This guide shows whether the fault comes from the Multi-Output Power Module. This guide also shows how to replace the Multi-Output Power Module.

1. Printer Power Module Overview

The printer uses several power modules. Each power module supplies a different system. The Multi-Output Power Module is the main power unit of the printer. It provides DC outputs of 24 V, 36 V and 42 V.

Power Module Components Powered Related Document
Multi-Output Power Module Mainboard, carriage board, X-axis motor, Y-axis motor, screen driver board, cooling fan This guide
24V Power Supply White ink circulation pump, white ink stirring motor KM-602｜24V Power Supply Inspection and Replacement Guide
1 Location Of The Power Modules

1-Location-Of-The-Power-Modules

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

This guide applies only to the Multi-Output Power Module. The 24V Power Supply supplies the white ink circulation pump and the white ink stirring motor. For the 24V Power Supply, refer to the KM-602｜24V Power Supply Inspection and Replacement Guide.

 

2. Multi-Output Power Module Wiring Diagram

2-1 Multi Output Power Module Wiring Diagram

2-1-Multi-Output-Power-Module-Wiring-Diagram
2-2 Multi Output Power Module Wiring Diagram Chinese

2-2-Multi-Output-Power-Module-Wiring-Diagram-Chinese
Category No. Voltage / Wire Color Description
AC Input ① AC 200–240 V
N (blue) / L (red)		 External AC power input
DC Output ② DC 36 V Output to the Y-axis motor
DC Output ③ DC 36 V Output to the X-axis motor
DC Output ④ DC 24 V Output to the cooling fan
DC Output ⑤ DC 24 V Output to the screen driver board
DC Output ⑥ DC 42 V Output to the carriage board
DC Output ⑦ DC 24 V Output to the carriage board and the mainboard
Ground ⑧ GND Protective grounding

In this guide, ①–⑧ always refer to the numbers in Fig. 2-1.

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

Inspection order:

  • Step 1: Check the external AC input (①).
  • Step 2: Check the DC outputs (②–⑦).
  • Step 3: Check the input voltage at the component. Perform Step 3 only after all DC outputs are normal.

⚠ Important: If the external AC input (①) has no power, all DC outputs (②–⑦) read 0 V. This reading is normal. This reading does not mean that the Multi-Output Power Module has failed. Always check the AC input first. Check the DC outputs after that.

3.1 Safety Instructions and Required Tools

  • Measure the voltages with the printer powered on. Wear insulated gloves. Touch the measurement points with the probes only. Do not touch exposed circuits with your hands.
  • Disconnect all power before you replace the power module. Turn off the machine power switch. Turn off the main power switch. Unplug the power cord.
  • Wait 1 minute after you Unplug the power cord. Then start to disconnect the cables.

Required tools: multimeter, Phillips screwdriver, phone or camera for photographs of the wiring, insulated gloves.

3.2 Opening the Back Panel

Open the back panel before inspection. Open the back panel before replacement.

⚠ Important: Photograph the wiring before you disconnect any cable. Use the photographs to reconnect each cable in its original position.

  1. Press the top power switch to turn off the printer. （See Fig. 3.2-1）
  2. Turn off the MAIN POWER switch. Unplug the power cord. （See Fig. 3.2-2）
  3. Gently pry out the white plastic cover plugs on both sides of the back panel. Unplug the network cable. （See Fig. 3.2-3）
  4. Remove the screws of the back panel. （See Fig. 3.2-4）
  5. Disconnect the cooling fan cable. Remove the back panel. （See Fig. 3.2-5）
3.2-1 Turning Off The Machine Power Switch

3.2-1-Turning-Off-The-Machine-Power-Switch
3.2-2 Turning Off The Main Power Switch And Disconnecting The Power Cord

3.2-2-Turning-Off-The-Main-Power-Switch-And-Disconnecting-The-Power-Cord
3.2-3 Removing The Plastic Cover Plugs And The Network Cable

3.2-3-Removing-The-Plastic-Cover-Plugs-And-The-Network-Cable
3.2-4 Removing The Screws Of The Back Panel

3.2-4-Removing-The-Screws-Of-The-Back-Panel
3.2-5 Disconnecting The Cooling Fan Cable

3.2-5-Disconnecting-The-Cooling-Fan-Cable

3.3 External AC Input Check (Test Point ①)

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

Measurement method:

  • Black probe → AC-N1 (neutral)
  • Red probe → AC-L1 (live)

Plug in the power cord before measurement. Turn on the MAIN POWER switch. Press the top power switch. （See Fig. 3.3-1 and Fig. 3.3-2）

3.3-1 Turning On The Main Power Switch

3.3-1-Turning-On-The-Main-Power-Switch
3.3-2 Measuring The External AC Input

3.3-2-Measuring-The-External-AC-Input
Measurement Result Status Action
AC 200–240 V The external AC input is normal. Go to 3.4.
0 V, or the reading is unstable The external AC input is abnormal. The Multi-Output Power Module is not the cause. given order. Measure ① again after you find the cause.
1. Power at the wall socket
2. PROTECTION SWITCH tripped
3. MAIN POWER switch turned on
4. Top power switch turned on
5. Loose or oxidized AC cable and terminals
6. Broken AC cable

3.4 DC Output Inspection (Test Points ②–⑦)

This step shows whether the DC outputs of the Multi-Output Power Module are normal. This step also shows whether the Multi-Output Power Module must be replaced.

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

Measurement method:

  • Red probe → positive terminal of the output
  • Black probe → negative terminal (return line) of the same output
  • Measurement condition: the printer is powered on and idle. Do not print during the measurement.

3.4.1 DC Output Measurement Points (Measure in Order)

Measure the DC outputs of the Multi-Output Power Module in the following order:

  • ② Y-axis motor output (36 V)
  • ③ X-axis motor output (36 V)
  • ④ Cooling fan output (24 V)
  • ⑤ Screen driver board output (24 V)
  • ⑥ Carriage board output (42 V)
  • ⑦ Carriage board and mainboard output (24 V)

(See Fig. 3.4-1 to Fig. 3.4-6)

3.4-1 Measuring The Y Axis Motor Output At Test Point 2

3.4-1-Measuring-The-Y-Axis-Motor-Output-At-Test-Point-2

3.4-2 Measuring The X Axis Motor Output At Test Point 3

3.4-2-Measuring-The-X-Axis-Motor-Output-At-Test-Point-3（
3.4-3 Measuring The Cooling Fan Output At Test Point 4

3.4-3-Measuring-The-Cooling-Fan-Output-At-Test-Point-4
3.4-4 Measuring The Screen Driver Board Output At Test Point 5

3.4-4-Measuring-The-Screen-Driver-Board-Output-At-Test-Point-5
3.4-5 Measuring The Carriage Board Output At Test Point 6

3.4-5-Measuring-The-Carriage-Board-Output-At-Test-Point-6
3.4-6 Measuring The Carriage Board And Mainboard Output At Test Point 7

3.4-6-Measuring-The-Carriage-Board-And-Mainboard-Output-At-Test-Point-7

3.4.2 Normal Voltage Ranges (Evaluation Criteria)

The measured voltage may fluctuate slightly. The output is normal if the reading stays within the range below (rated value ±10%).

Rated Voltage Test Points Normal Range (rated value ±10%)
24 V ④ ⑤ ⑦ 23 – 25 V
36 V ② ③ 35 – 37 V
42 V ⑥ 41– 43 V

Normal readings are shown in Fig. 3.4-7 to Fig. 3.4-9. An abnormal reading is shown in Fig. 3.4-10.

3.4-7 Normal Reading Of The 24V Output

3.4-7-Normal-Reading-Of-The-24V-Output
3.4-8 Normal Reading Of The 36V Output

3.4-8-Normal-Reading-Of-The-36V-Output
3.4-9 Normal Reading Of The 42V Output

3.4-9-Normal-Reading-Of-The-42V-Output
3.4-10 Abnormal Reading Of The Output

3.4-10-Abnormal-Reading-Of-The-Output

3.4.3 Evaluation and Actions

Measurement Result Status Action
All outputs ②–⑦ are within the normal range. The Multi-Output Power Module is normal. If the fault is gone, the task is complete.
If a component still does not work, go to 3.5.
All outputs ②–⑦ read 0 V, and ① is confirmed normal. The Multi-Output Power Module is faulty. Replace the Multi-Output Power Module. Go to Section 4.
One output reads 0 V, or one output is below the lower limit. This output of the Multi-Output Power Module may be faulty. A short circuit in the downstream circuit may also pull this output down. Rule out the downstream circuit first.
1. Disconnect all power. Unplug the connector of this output.
2. Turn on the power. Measure again at the output terminal of the Multi-Output Power Module.
3. If the voltage returns to the normal range, the fault is in the downstream cable or in the downstream component. Do not replace the Multi-Output Power Module. Check the cable and the component of this circuit.
4. If the voltage is still 0 V or still low, the Multi-Output Power Module is faulty. Go to Section 4.

⚠ Important: Go to 3.5 only after all outputs ②–⑦ are normal. If any DC output is abnormal, do not continue to check the components. A wrong conclusion is possible.

3.5 Component Input Voltage Inspection (Only After All DC Outputs Are Normal)

This step answers one question. Does the power reach the component that does not work?

Check only the component that does not work. Measurement of every component is not required.

3.5.1 Select the Measurement Point by Symptom

Component That Does Not Work Measurement Position Rated Voltage Figure
Y-axis motor Power input terminal of the Y-axis motor 36 V Fig. 3.5-1
X-axis motor Power input terminal of the X-axis motor 36 V Fig. 3.5-2
Cooling fan Power input terminal of the cooling fan 24 V Fig. 3.5-3
Screen Power input terminal of the screen driver board 24 V Fig. 3.5-4
Carriage board 42 V power input terminal of the carriage board 42 V Fig. 3.5-5
Carriage board 24 V power input terminal of the carriage board 24 V Fig. 3.5-6
Mainboard Power input terminal of the mainboard 24 V Fig. 3.5-7

3.5.2 Measurement Method

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

  • Red probe → positive terminal of the power connector of the component
  • Black probe → negative terminal (return line) of the same connector
  • Measurement condition: the printer is powered on
3.5-1 Measuring The Input Voltage At The Y Axis Motor

3.5-1-Measuring-The-Input-Voltage-At-The-Y-Axis-Motor
3.5-2 Measuring The Input Voltage At The X Axis Motor

3.5-2-Measuring-The-Input-Voltage-At-The-X-Axis-Motor
3.5-3 Measuring The Input Voltage At The Cooling Fan

3.5-3-Measuring-The-Input-Voltage-At-The-Cooling-Fan
3.5-4 Measuring The Input Voltage At The Screen Driver Board

3.5-4-Measuring-The-Input-Voltage-At-The-Screen-Driver-Board
3.5-5 Measuring The 42V Input Voltage At The Carriage Board

3.5-5-Measuring-The-42V-Input-Voltage-At-The-Carriage-Board
3.5-6 Measuring The 24V Input Voltage At The Carriage Board

3.5-6-Measuring-The-24V-Input-Voltage-At-The-Carriage-Board
3.5-7 Measuring The Input Voltage At The Mainboard

3.5-7-Measuring-The-Input-Voltage-At-The-Mainboard

3.5.3 Evaluation and Actions

Input Voltage at the Component Status Action
Within the normal range The power supply path is normal. The fault is not in the Multi-Output Power Module. The task in this guide is complete. Go to the troubleshooting guide for that component.
0 V The power does not reach the component. 1. Disconnect all power. Reconnect the connectors at both ends of this circuit. Push each connector fully into place. Check the connectors for oxidation.
2. Turn on the power. Measure again.
3. If the reading is still 0 V, the power cable of this circuit is broken. Replace the power cable.
Clearly below the normal range, or the reading is unstable The contact in the power supply circuit is poor. Repeat the steps in the row above. If the reading is still abnormal, replace the power cable of this circuit.

4. Multi-Output Power Module Replacement

4.1 Power Off

  1. Press the top power switch to turn off the printer. （See Fig. 3.2-1）
  2. Turn off the MAIN POWER switch. Unplug the power cord.（See Fig. 3.2-2）
  3. Wait 1 minute. Then start to disconnect the cables.

The back panel was removed in 3.2. Removal of the back panel again is not required.

4.2 Remove the Old Power Module

⚠ Important: Photograph the wiring before you disconnect any cable.

  1. Disconnect the DC output cables ②–⑦ in order. Follow Fig. 2-1.
  2. Disconnect the AC input cable ①.
  3. Disconnect the protective grounding cable ⑧ last.
  4. Remove the fixing screws. Then remove the old power module. （See Fig. 4.2-1 and Fig. 4.2-2）
4.2-1 Removing The Fixing Screws And The Cables

4.2-1-Removing-The-Fixing-Screws-And-The-Cables
4.2-2 The Removed Multi Output Power Module

4.2-2-The-Removed-Multi-Output-Power-Module

4.3 Install the New Power Module

  1. Confirm that the new power module is the same model as the old power module.
  2. Place the new power module in the original position. Tighten the fixing screws.
  3. Connect the protective groundg cable ⑧ first. Connect the AC input cable ① next. Connect the DC output cables ②–⑦ last.
  4. Compare the wiring with the photographs from 4.2. Confirm that every cable is in the correct position. Confirm that every cable is pushed fully into place. Confirm that no cable is loose.

5. Power-On Check

5.1 Power On and Measure the Outputs Again

  1. Plug in the power cord. Turn on the MAIN POWER switch. （See Fig. 3.3-1）
  2. Press the top power switch. Check the indicator light of the power module. （See Fig. 5.1）
  3. Measure the DC outputs ②–⑦ again. Use the method in 3.4.
5.1-1 Turning On The Machine Power Switch

5.1-Turning-On-The-Machine-Power-Switch

5.2 Evaluation and Actions

Result Action
The indicator light is on. All outputs ②–⑦ are within the normal range. See Fig. 5.2-1. Go to 5.3 and reinstall the back panel.
The indicator light is off or flashes abnormally, or one output from ② to ⑦ is still abnormal. See Fig. 5.2-2. 1. Press the top power switch immediately. Turn off the MAIN POWER switch. Unplug the power cord.
2. Check every cable again. Use the steps in 4.3.
3. If the reading is still abnormal, stop the use of the printer. Request service as described in Section 6. Do not replace any other component.
5.2-1 Normal Indicator Light Of The Power Module

5.2-1-Normal-Indicator-Light-Of-The-Power-Module
5.2-2 Abnormal Indicator Light Of The Power Module

5.2-2-Abnormal-Indicator-Light-Of-The-Power-Module

5.3 Reinstall the Back Panel

  1. Press the top power switch. Turn off the MAIN POWER switch. Unplug the power cord.
  2. Connect the cooling fan cable. Install the back panel. Tighten the screws.
  3. Plug in the network cable. Install the white plastic cover plugs on both sides.
  4. Plug in the power cord. Turn on the MAIN POWER switch. Press the top power switch.

6. Final Confirmation

Situation Conclusion
The outputs are normal. The original fault is gone. The task is complete.
The outputs are normal. The original fault remains. The Multi-Output Power Module is not the cause of the fault. Return to 3.5 and measure the input voltage at the component. You can also go to the troubleshooting guide for that component.
One output is still abnormal, or the indicator light is abnormal. Stop the use of the printer. Disconnect all power. Check the wiring again. If the reading is still abnormal, request service as described in 6.1.

6.1 Information to Provide When You Request Service

  • The measured AC voltage at ①.
  • The measured DC voltage at each output from ② to ⑦.
  • The name of the component that does not work.
  • Photographs of the measurement points and of the power module wiring.

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