rotai RT-7900S Operating instructions

RT-7900S Repair Manual

Contents
01 Massage Chair Control Principle
02 Structure Instruction & Installation
03 Troubleshooting

User connecting PCB
Remote controller
CPU chip
recliner
Massage Chair Control Principle
Air pump Transformer Mechanism
Air valve

Maintenance Guide - Inner structure & installation
1.Inner Structure Diagram
2.Mainboard Diagram
3.Air Valve Diagram
4.Part Removal Guide and Video

head piece
armrest
power box
footrest unit
Maintenance Guide - Inner Structure &Installation

p o w e r
box
calf recliner
DC24v/80mm
forwarding
cylinder
DC24v/280mm
b a c k r e c l i n e r
（with hall）
DC24v/124mm
Maintenance Guide - Inner Structure &Installation
1. Inner Structure Diagram
3D
mechanism

3D vertical
counting
board
3D
detection
board
3D
vertical
motor
3D vertical
detection
board
Width
detecting
board
Walking
motor
knocking
motor
kneading
motor
Maintenance Guide - Inner structure & installation
1.2 Mechanism’s Structure
hard arm

user
connecting PCB
5V power board
mainboard
leg air pump armrest air pump transformer
2 way air valve for
seat
control button signal leg communication signal
Maintenance Guide - Inner structure & installation
1.3 Power Box Inner Diagram

legrest
power
legrest
recliner
backrest
recliner
left
armrest
button
3D COMM
signal
legrest
COMM
signal
user
connecting
PCB
5V
power
signal
backrest
recliner hall
signal
legrest
recliner
counting
signal
walking
motor
distance
signal
right
armrest air
valve
left
armrest
air valve
seat air
valve
armres
t
chargin
g
power
AC19V air
valve power
legrest
air
pump
armre
st air
pump
AC2
1V
3D
vertic
al
motor
knead
ing
motor
tappin
g
motor
back
heatin
g
walkin
g
motor
APP signal
back heat
sensing
program
update
forwarding
cylinder
Forward
cylinder
distance
signal
backrest
recliner
counting
signal
audio
signal
Maintenance Guide - Inner structure & installation
2.1. Mainboard Diagram

2.2 User Connecting PCB
Connector Diagram remote controller
COMM signal
remote
controller signal
audio
signal
left&right
speaker signal
A P P
signal
Maintenance Guide - Inner structure & installation

2.3 Footrest mainboard connector diagram
DC24V
input
DC24V
output
air valve
C a l f e x t e n s i o n
detection signal
Calf PCB board
COMM signal
Calf COMM signal
output
foot extension
motor
roller
motor
Roller motor detection
counting signal
Maintenance Guide - Inner Structure &Installation

2.4 Legrest mainboard connector
diagram
D C 2 4 V
input
leg&knee
heat
air valve
extension
distance signal
legrest COMM
signal input
l e g h e a t
sensing signal
leg extension
motor
Maintenance Guide - Inner Structure &Installation

2.5 3D Interface Board Diagram 3 D m o t o r
counting signal
Knocking
motor signal
3D COMM
signal
width
signal
kneading
motor counting
signal
3 D m o t o r
distance signal
Maintenance Guide - Inner structure & installation

2. 6 Width sensor board diagram
width
signal
walking motor
counting signal
Maintenance Guide - Inner structure & installation

3.1 Air Valve Diagram
leg air hose
Air Pump
1 Air Pump
2
seat 2 way air
valve 4 way air connector
6 way air valve
arm
2
waist
5
shoulder
1
6 way air valve
Maintenance Guide - Inner structure & installation
arm
3
arm
4
back
6
shoulder
12
arm
11
arm
10
arm
9
waist
8
back
7

4.1 Armrest installation guide
1
1
2 2
3
3
44
5
5
Get the armrest unit（Same way to install
the left and right arm）
1.connect the air hose and plugs according
to the matching No. and colors.
2.Attach the mounting bracket to the chair
seat Square steel tube.
3.Line up the armrest mounting pin with the
pin receiver on the chair body.
4.Press the armrest.5.Screw the bolts in 4/5
position.
Maintenance Guide - Inner structure & installation

4.2 Footrest Installation Guide
Maintenance Guide - Inner structure & installation
1.Find this cable 2.Plug it into
chair body
3. Attach the
footrest to the
chair body
4. Attach the
footrest clip to
the end of the
chair body

4.3 Head Assembly Removal Guide
Unsc r e w t h e s e
bolts on the back
cover
Unscrew these
bolts
Unplug the
connectors
and air hoses
Maintenance Guide - Inner structure & installation

4.4 Mech Removal Guide
Maintenance Guide - Inner structure & installation
1 Unscrew 2 side bolts 2.Take off the Upper
Limit Sensor Detection
Board, but do not
unplug it.
3. Enter background mode
and choose walk motor
test to run the mech
until it stops at the
top position.
4. Cut the cable tie,
unscrew the bolt and
unplug it,then take
out whole Mech.

4.5 Mech motor removal guide
拆行走电机带轴视
频.mp4
拆揉捏电机视频.
mp4
拆敲打电机视频.
mp4
拆3D径向电机视
频.mp4
拆曲臂组件视频.
mp4
Maintenance Guide - Inner structure & installation