Johnson MC-J6900 Service Manual

JOHNSON
Issue Date

2018/4/23

Edition

01

Doc No.

Revision Date

Edition
Time

2018/1

0/10

Page

47

Johnson Industries (Shanghai) Co., Ltd

MC-J6900 MASSAGE CHAIR

Service Manual

Approval

Review

Editor

Allen Sun

Allen Sun

Hans Kong

FOREWORD

A. When disassembling, unplugging connectors and replacing parts, make sure to unplug or turn

B. As semiconductors (IC, etc.) are prone to being damaged by static electricity, please use human

C. The circuit baseplate mixes high voltage (AC110V, AC220V) and low voltage (12V, 5V), which

Precautions during repairs and faults:

off the power.

body electrostatic discharge ground wire if it is required to directly contact the baseplate when
performing operations, or touch the ground wire (ground wires of fridges, washing machines, etc.)
with bare hands to discharge the static electricity of the human body before carrying out operations.

may cause electric shock accident; so please do not have direct contact without preparations.

Content

CHAPTER 1:PRODUCT SPECIFICATIONS
CHAPTER 2:MAINTENANCE AND STORAGE
CHAPTER 3:ENGINEERING MODE INSTRUCTION

3.1 Key Operation:

3.2 Display Information:

3.3 P1 Mode:

3.4 P2 Mode

3.5 P3 Mode

3.6 P4 Mode

3.7 PU Mode
CHAPTER 4:ERROR CODE
CHAPTER 5:TROUBLESHOOTING

5.1 Wiring Schematic

5.2 Fail To Start

5.3 Fail To Start - Continue

5.4 Pushrod Motor Does Not Work

5.5 Speak Has No Sound

5.6 Individual Air Bag Can Not Be Inflated Or Inflated Sufficiently

5.7 All Air Bags Do Not Work

5.8 Abnormal Warming Function

5.9 Machine Core Motor Does Not Work

5.10 Abnormal Key Function

5.11 Chair Back Reclines Abnormally

5.12 Machine Core Movement Issue

5.13 E5 Error Code
CHAPTER 6:PARTS REPLACEMENT

6.1 Air Pump

6.2 Machine Core

6.3 Master Control Panel

6.4 Footrest

6.5 Software Update

6.6 Machine Breakdown Drawing
CHAPTER 7:PARTS LIST

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1

CHAPTER 1:PRODUCT SPECIFICATIONS

2

CHAPTER 1:PRODUCT SPECIFICATIONS

3

CHAPTER 1:PRODUCT SPECIFICATIONS

4

CHAPTER 2:MAINTENANCE AND STORAGE

 Prior to the maintenance work, make sure to disconnect the power cord. Be careful that hands

 Do not use benzene, thinner or alcohol to clean the choir, nor spray any liquid containing any

 Wipe the coated surface with a dry cloth.

 Do not use benzene, thinner, alcohol solvents or abrasives to avoid scratch, discoloration or

 Never use a wet cloth for cleaning to avoid malfunction.

 Do not iron to prevent damage to the fabric.

 Do not use benzene, thinner, or alcohol for cleaning, nor spray any liquid containing any

 Do not place the unit in areas exposed to direct sunlight, or near heaters, hot air blowers or any

To keep the appliance working and looking its best, please follow these cleaning guidelines

once a week.

Area covered with synthetic leather:

For cleaning, wipe the unit with a dry cloth moistened in diluted neutral detergent and
thoroughly wrung out. and then use a dry cloth to wipe the unit again. Thereafter, allow the unit to
dry naturally.

(Excessive use of detergent may harm the synthetic leather surface).

Keep the unit clean and place it in a location with appropriate temperature and avoid moisture
and dust.

must not be wet to prevent electric shock or injury.

chemical agents to prevent the risk of electric shock or catching fire.

Main body:

Use a dry cloth moistened with diluted neutral detergent and thoroughly wrung out to clean the
plastics or the pipes, and then wipe with a dry cloth to completely remove the residual detergent.

cracks on the surface.

Remote controller:

Use a dry cloth to clean the remote controller.

Back pad,pillow,seat cushion and other fabric parts:

Wipe the parts with a dry cloth moistened in diluted neutral detergent and thoroughly wrung out,
and then use a dry cloth to wipe the parts again. Thereafter, allow the parts to dry naturally.

chemical agents to prevent damage to the fabric.

Storage:

After cleaning, keep the unit away from humidity. When the unit is not being used for a long
period of time, place a cover over the unit to protect it from dust.

other heating devices to avoid discoloration or deterioration on the surface of the holster.

5

CHAPTER 3:ENGINEERING MODE INSTRUCTION

A. When the power is on and manual controller is not yet activated(before enter the main

3.1 Key operation:

interface), press point and heat on the manual controller at the same time for 5 seconds and the
controller will display “ - - ”

+ =

6

CHAPTER 3:ENGINEERING MODE INSTRUCTION

B.Then press full back key to enter engineering mode

C.In the engineering mode,“ P0 ” will be displayed

D.Use up and down to select 8 modes, including P0~P4+P7+P8+PU

&

E.In mode selection state, press OK to enter the mode to operate the massage chair

F.After mode selection, use up and down again to select the element to be controlled, such as
A0~A5

G.After element selection, use massage intensity strong and weak to adjust the element speed,
and the intensity will be displayed as the air pressure strength, with one to three representing from
weak to strong

7

CHAPTER 3:ENGINEERING MODE INSTRUCTION

H.strong or weak air pressure strength will make the selected element forward or reverse (if
such element has no forward and reverse states, it will be in motion state)

I.After entering the mode, press stop key to return to the previous layer of menu; this key has
the same function as the ESC key of the computer keyboard

3.2 Display information:

8

Mode list:

CHAPTER 3:ENGINEERING MODE INSTRUCTION

3.3 P1 Mode:

Motor test mode is mainly used to test if each motor works normally and to adjust chair angle
when replacing elements.

9

Upper limit is

triggered.

Tens and ones of

returned values

Hundreds of

returned value

Current speed of

motor motion

CHAPTER 3:ENGINEERING MODE INSTRUCTION

The left figure shows that the upper limit

is reached when the selected machine core

(C0) rises.

When the upper limit light is, it means

that the machine core is unable to move

upward; when the lower limit light is on, the

machine core is unable to move downward.

The lamp signal 1 of massage intensity

represents 100, 2 represents 200, and so on.

We can tell by the above rules that the

returned value on the left figure is time

window (49) + motion menu lamp signal

(200) =249.

3.4 P2 Mode

Sensor testing is mainly used to test and indicate limits and counts. When operating motor in
this mode, LCD time window will display the digit returned by the sensor. When the digit exceeds
100, the carrying digit will display “massage intensity” (100~500) and “motion menu”.

LCD sensing position display window will indicate whether the limit switch is triggered.

10

CHAPTER 3:ENGINEERING MODE INSTRUCTION

3.5 P3 Mode

Current testing is mainly used to test if the motor current is too high.

When the returned number exceeds 100, the carrying digit will display “massage intensity”
(100~500).

D3 is a major test item; if the intensity is set to medium (air bag strength 2) and machine core
forward value is greater than 50, it is likely to generate error code D0 because the current is too
high to lower the sensitivity of induction mechanism.

11

CHAPTER 3:ENGINEERING MODE INSTRUCTION

3.6 P4 Mode

Air bag testing is mainly used to test if the air bag works normally, the inflation rate is normal,
there is leakage, etc.

It can also distinguish the position of the air bag to be tested via the pattern on the manual
controller.

12

CHAPTER 3:ENGINEERING MODE INSTRUCTION

a. Press “up” or “down” key to make the time window display “PU” to enter software version

b. Press “OK” function, and the time window displays “U0” to enter manual controller software

c. Press “air pressure strength” key, and the time window displays in a jumping loop of

d. Press “up” or “down” key to make the time window display “U1” to enter lower control panel

e. Press “air pressure strength” key, and the time window displays in a jumping loop of

f. Then, the software version is 104105

3.7 PU Mode

Software version check mode is generally used to confirm current version of massage chair
and confirm again if the update is successful after updating software

check function

version check function

“v1”-“04”-“v1”-“04”...... indicating that the manual controller software version is v104

software version check function

“v1”-“05”-“v1”-“05”...... indicating that the lower control panel software version is v105

13

CHAPTER 4:ERROR CODE

Error code
area.

The error code will appear on the machine’s manual controller and the machine will stop.

Maintenance personnel can judge the fault conditions and anticipate maintenance materials
based on the error code reported by the customer.

14

CHAPTER 5:TROUBLESHOOTING

5.1 Wiring Schematic

15

Wiring Schematic

1

Machine Core Motor

2

Back chair motor

3

Foot motor

4

Foot heat

5

Power

6

Back chair heat

7

Air pump

8

12 ways air valve

9

5 ways air valve

10

Right speaker

11

Left speaker

12

Audio sub

13

Bluetooth board

14

Remote controller

15

Armrest buttons

16

Engineering test

17

Software input

18

Machine core signal

CHAPTER 5:TROUBLESHOOTING

16

CHAPTER 5:TROUBLESHOOTING

2) Turn on the switch.

3) Press the button on the remote controller.

4) Select a massage function.

1) After reset, the power led turns on,so it may be motor overload, keep on observing.

2) After reset, the power led turns on and then off immediately,so the circuit system may be

1.turn on the power supply.

2.Press the protector to reset.

5.2 Fail to start

Check points: 1) Check whether there is poor connection between the power plug and the

receptacle.

2) Check whether the switch has been turned on.

3) Check whether the on the remote controller has been pressed.

4) Check whether any massage function has been selected.

Solutions: 1) Ensure good connection between power plug and the receptacle.

If the above mentioned make no effects,reset the machine.

short circuited and requires attention. It is recommended to ask the personnel with electronic
background to check and repair. There may be broken covered wires, short circuits or breakdown
of electronic devices.

17

CHAPTER 5:TROUBLESHOOTING

1.Turn on the power supply.

2.Remove screws and cover.

Put the probe on
the power supply
input end.

Switch to AC on
the power on the
power supply to
conform voltage.

Test if the output
end voltage
conforms to the
input end.

Turn off the
power,measure
if the fuse is
damaged.

5.3 Fail to start - Continue

Check points: 1) EMC board issue.

2) Transformer issue.

3) Software issue.

4) Controller issue.

Solution: 1) Confirm if the power supply and EMC filter board are normal. Measure if AC110V
(AC220V in mainland China) power supply of output end of EMC board is normal.

Possible cause: EMC board fuse damage, EMC board damage or poor contact of connecting
line.

The main purpose is to measure if the input end voltage has output voltage (AC110V or
AC220V) after passing through the filter; if there is no voltage, check if the fuse is burned (The
power must be off when measuring the fuse).

When the fuse is not burned, and there is still no output voltage, replace the filter.

18

CHAPTER 5:TROUBLESHOOTING

3) Record the software for the master control panel and manual controller again and observe if

4) Change to the spare manual controller for operation. If it operates normally, replace the

2) Confirm if the transformer power supply is normal. Measure transformer output end voltage:

no load AC24-28V, AC12-15V, AC15-18V.

Possible cause: the fuse inside the transformer is damaged; replace the
transformer(1000347562).

the indicator light of the master control flashes normally.

manual controller; if not so, replace the master control panel(1000391515).

19

CHAPTER 5:TROUBLESHOOTING

 If pushrod motor still can’t work,replace master control panel(1000391515).

 If motor works normally,replace the pushrod motor(1000347555/1000394189).

1) Rule out that the internal thermal protection of air pump is caused by long-time.

2) Judge whether the air pump works or not by listening to its sound.

3) Check if the solenoid valve works normally. If not,check air valve connecting line or

5.4 Pushrod Motor does not work

Solution :

Unplug the power line of the electric pushrod motor which does not work, and replace with
spare pushrod motor (or replace with the electric pushrod which works normally on the machine) for
testing.

5.5 Speaker Has No Sound

Check points:

audio connecting line are poorly connected; speaker is damaged; stereo headphone line is

damaged;incompatible headphone specification.

Solution:

Replace with operational board for testing,replace the MCB(1000391515) or the
speaker(1000394190).

5.6 Individual Air Bag Can Not Be Inflated Or Inflated Sufficiently

Solution :

Use engineering mode:P4 to detect,and refer to the air bag location diagram.Check if the
solenoid valve works normally.Check if each air channel connector leaks or air pipes are
compressed and shut off.

According to the check,replace the valve(1000392761) or air pipes(1000408290).

5.7 All Air Bags Do Not Work

Solution:

operation,stop the machine for a while and try again.

If no sounds,check air pump power supply.
If power supply is good(AC 24V-28V),replace air pump(1000392758).
If power supply has problem,replace master control panel(1000391515).

replace master control panel.

20

CHAPTER 5:TROUBLESHOOTING

1)

Check if the connecting line terminal connection is normal.

2) Check warming piece’s resistance value:

5.8 Abnormal warming function

Solution :

– Back chair warming piece: normally about 17Ω, and about 34Ω in case of unilateral damage.
Check connecting line/replace warming piece.

restored.

It is recommended to connect the spare directly and then observe if the warming function is

21

CHAPTER 5:TROUBLESHOOTING

3)

Measure if the master control panel has DC24V-30V output; if not, replace the master

– Footrest warming piece: normally about 48Ω, and about 96Ω in case of unilateral damage.

Check connecting line/replace warming piece(1000373418/1000405385).

control panel(1000391515).

22

CHAPTER 5:TROUBLESHOOTING

1) First, rule out that the internal thermal protection of motor is caused by long-time operation

2) Use manual mode to force the motor to start, checking if it can be started.

3) Enter P2 (refer to2-2) to check if the sensor corresponding to the poor motor triggers the

5.9 Machine Core Motor Does Not Work

Solution :

limit.

For example, when the front and back machine core motors cannot move forward, it is required
to note that if the front limit lamp signal is triggered; when the front limit lamp is on, it represents that
the lower control panel thinks that the machine core is at its foremost position and cannot go more
forward.

If the front limit light is triggered when the motor position does not touch the front limit, sensor
might be damaged, the sensor piece position is poor, or connecting line contact is poor.

23

CHAPTER 5:TROUBLESHOOTING

4) When using the engineering mode P1 to drive the poor motor, use the electric meter to

1) Check if the master control panel software is normal; try to update the software and

2) Check if the connecting line is normal.

3) Check if the armrest’s shortcut keys and manual controller’s rubber keys are normal. Clean

measure if the motor corresponding plug on the machine core signal adapter board has DC24V
output.

If no,check motor power line→ power line PASS→replace master control panel(1000391515).

If yes,replace machine core(1000382973).

5.10 Abnormal Key Function

Solution:

then confirm.

or replace them(1000405065).

24

CHAPTER 5:TROUBLESHOOTING

1) Check if the armrest’s shortcut keys are seized.

2) Check if the manual controller’s keys are seized.

1) Check the appearance of upper and lower limit switches for any damages.

5.11 Chair Back Reclines Abnormally

Solution :

If the frequency is high, replace the shortcut key board(1000228108).

If the frequency is low, press the keys to return to the original state and then observe.

5.12 Machine Core Movement Issue

Symptom :

Normally it can come down but cannot go up; the condition also includes that it can go up but
cannot come down.

Solution :

25

CHAPTER 5:TROUBLESHOOTING

2) Enter engineering mode P2 , and see if the upper (lower) limit lamp signal is triggered; if the

limit lamp signal is triggered when the machine core does not touch the upper (lower) limit, it
represents sensor anomaly or poor contact of the signal line(1000306155).

Note :When the machine core’s old connector is matched with a new signal line, or when the

connector is plugged inversely, this phenomenon will also occur.

26

Re-connector , make
sure the connector is
surely connected.

CHAPTER 5:TROUBLESHOOTING

5.13 E5 ERROR CODE

Check point: 1) U/D disk check

Open back upper cover ,uninstall 4 screws.

The encoder disk can’t touch the sensor , it must have 1~3mm gap between disk and sensor.

Find out the U/D sensor , and check.

Make sure the disk is clear ,no dust cover ,and in the middle position .

27

CHAPTER 5:TROUBLESHOOTING

Check point: 2) Motor check

Select auto course ,after execute , the machine core will going down.If the machine core goes

down ,the U/D motor is good .

If not,disconnect the connector of U/D motor , and take the connector of Tap motor to connect.

Take the terminal off.

28

CHAPTER 5:TROUBLESHOOTING

After execute auto course , the tapping function will active

If the tapping function is active> replace machine core(1000382973)

If the tapping function is not active > replace MCB(1000391515)

Check point: 3) U/D limit switch module check

Use engineer mode A0 to makes the machine core goes down.

Remove the 2 screws in red circle , and loose the 2 screws in blue circle.

29

CHAPTER 5:TROUBLESHOOTING

Make sure the both sides metal pieces opened as the picture.

Use A0 to make the machine core goes up.

Take a fabric to prevent the wheel pop out by the spring.

30

CHAPTER 5:TROUBLESHOOTING

Touch the U/D sensor module for inspection .

When you touching the limit switch , you should hear “click” sounds.

If you can’t hear the noise , the limit switch module may stuck ,try to release or replace a new

one(1000373506).

31

CHAPTER 5:TROUBLESHOOTING

Caution! : Mark them before you replace the limit switch.

The UP/ DOWN cables should not be

installed incorrectly, otherwise the machine core will crash.

And there should be a plastic piece on the left top.

There should be a plastic on the left bottom.

32

6.1 Air pump

CHAPTER 6:PARTS REPLACEMENT

Power on , and lift the footrest to the top.

Footrest on the top position.

Power switch off , disconnect the power cord.

33

CHAPTER 6:PARTS REPLACEMENT

Use screw driver to uninstall 6 rivets.

Uninstall the air tube and disconnect the connector.

Uninstall the two screws on metal plate.

Note : Not the screws on the plastic cover. They are the two screws on the metal plate.

34

CHAPTER 6:PARTS REPLACEMENT

Take the air pump module out and replace(1000392758).

Take inverse to set up. Power on , test the function.

35

CHAPTER 6:PARTS REPLACEMENT

1) Turn off the power supply, and remove the outer shell screws.

2) Remove the upper back cover; because the tenon is barbed, it is recommended to use a

3) Enter the engineering mode A0, elevate the machine core to the proper height and cut the

4) Use Phillips screwdriver to loosen the ground wire screws of the signal line.

6.2 Machine Core

flathead screwdriver to help the removal.

cable tie fixing the signal line.

36

CHAPTER 6:PARTS REPLACEMENT

5) Loosen the set screws of rear cover side plate (2 screws in blue circles).

6) Loosen the left and right set screws of rear cover side plate to avoid screw breakage when

7) Loosen the supplementary piece screws of the upper rail.

8) Use the manual controller to operate the machine core to adjust the position.

9) Move the machine core roller to the upper position to prepare for removal.

the upper back side plate is propped open to remove the machine core.

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CHAPTER 6:PARTS REPLACEMENT

10) Be careful that the roller on the left side may eject; assist with hands.

11) Make the rollers on the upper sides off the rails.

12) Utilize the gap of the rear cover side plate.

13) Elevate until breaking away from rack engaging state.

14) Unplug the power line and signal connecting line.

15) Use both hands to remove the disengaged machine core(1000382973).

38

CHAPTER 6:PARTS REPLACEMENT

16) Install the new machine core in the reverse sequence of removal.

17) It should be noted that plastic gaskets are needed for the right-side roller of the new

18) It should be noted that spring and metal gaskets are needed for the left-side roller and

19) After the machine core is installed, tighten the rail fixing piece.

20) Lock the signal line ground wire on the set screws of the adapter board. The picture shows

21） And use the cable tie to fix the connecting line on the machine core metal plate. If the tie

machine core and such materials can be obtained from the old core.

such materials can be obtained from the old core.

that the ground wire is not locked.

specification is small, use two or more ties for fixing. There are holes for fixing the ties indicated
by red circles.

Note: When the signal line is not securely fixed, it may lead to occasional anomalies due to the

loosened signal line during the operation.

39

CHAPTER 6:PARTS REPLACEMENT

22） After the installation is completed, elevate the machine core to the upper limit and confirm

23） Lower the machine core to the lower limit and confirm that the sensor works normally, and

that the sensor works normally, and adjust the metal plate properly to the center position (about
2 mm from both sides).

adjust the metal plate properly to the center position.

40

CHAPTER 6:PARTS REPLACEMENT

1) Disconnect all the cable ports.

2) Remove the fixing screws.

3) Remove the master control panel carefully(1000391515).

6.3 Master Control Panel

41

CHAPTER 6:PARTS REPLACEMENT

1) Remove the panel underneath the foot rest, to do this use the controller to elevate the

2) Disconnect the air-hoses and foot heater power cord.

6.4 Footrest

To replace the leg massage portion you’ll need zip ties (medium and small size), something to
cut zip ties, wrenches, screwdriver, and other misc. tools.

leg-rest up.To remove the panel push in the center part of the buttons displayed below, this will pop
them out and allow the panel to be removed.

Note :When re-installing the new unit, remember where the power cord plugs into.

42

CHAPTER 6:PARTS REPLACEMENT

3)

Once the cable is unplugged and the air-hoses are disconnected you’ll need to lower the

leg-rest back down using the controller.Once the leg-rest is down we need to remove the seat from
the massage chair, in order to do this we need to pull up on the seat from the back and pull forward.
There are screws attaching the front of the seats upholstery to the frame, there are also air-hoses
connected to the seat that should pull out as well.

43

CHAPTER 6:PARTS REPLACEMENT

4) Remove the plastic side covers on each side of the leg-rest to access the connection

5) Once these connections are undone the footrest can be removed(1000383038).To install

To remove the screws:

points.The connection points will need to be removed with a wrench on the right side, and channel
lock pliers on the left.The left side is connected with a pin that needs to be pulled.

the new footrest follows the steps in reverse, you may need to harvest some parts from the old
footrest assembly for the new foot rest (plastic trim, screws, etc).

44

CHAPTER 6:PARTS REPLACEMENT

•

Prepare the flash drive and software

•

J6800 software includes 2 parts (all *.BIN files):

•

A. Manual controller application software jconsole.bin

•

B. Lower control panel application software jfitness.bin

•

It is recommended to install the software in the flash drive below 8GB to avoid that the

•

It is recommended to store only the file folder jfitness in the flash drive to improve recording

1) Enter the engineering mode PU (refer to 2-5 engineering mode:PU) to confirm that if the

2) While the machine’s power is off, insert the flash drive with new software files to the USB

3) Press "start/stop" key on the manual controller to turn on the machine power switch (press

4) Then, you will see the pounding lamp is on. Press the power key continuously and then you

5） You will hear the relay’s motion sound 5 seconds after the pounding lamp stops flashing,

6.5 Software Update

lower control panel cannot read the flash drive

success

Operation:

software version needs update.

line.

the manual controller power switch continuously).

will see that the pounding lamp keeps flashing.

and the update is completed. Unplug the flash drive and test again by restarting the machine.

45

CHAPTER 6:PARTS REPLACEMENT

6.6 Machine breakdown drawing

46

CHAPTER 7:PARTS LIST

Part list

JHT No.

Adaptor(transformer)

1000347562

MCB(master control board)

1000391515

Pushrod motor(chair)

1000347555

Pushrod motor(foot)

1000394189

Air pipe

1000408290

Air pump

1000392758

Air value

1000392761

Machine core

1000382973

Hand controller

1000405065

PCB board

1000228108

Stopper limit

1000373506

Control board sensor

1000306155

Foot rest

1000383038

Speaker wire set

1000394190

Warming piece(foot)

1000373418

Warming piece(leg)

1000405385