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stex S25U Service Manual
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stex S25U Service Manual

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S25U Upright Bike
Customer Support Services
Service manual

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Questions and answers

Jack
June 10, 2025

my '+' button on level of effort does not work; i have Stex S25UX machine

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1 comments:
Mr. Anderson
August 17, 2025

If the '+' button on the level of effort does not work on your Stex S25UX machine, follow these steps:

1. Check the DISPLAY CONSOLE and ensure it is properly secured and powered.
2. Inspect the wiring between the DISPLAY CONSOLE and the support column to ensure proper connection.
3. Refer to the assembly instructions and confirm all parts, including the console and wires, are correctly installed.
4. If the issue persists, contact the service center and provide the model number, serial number, symptom of the problem, and the part or assembly name and number.

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Summary of Contents for stex S25U

  • Page 1 S25U Upright Bike Customer Support Services Service manual...

  • Page 2: General Contents

    General Contents 1. Introduction 2. Component identification 3. Parts manual 4. Assembly instructions < 2 >...
  • Page 3 // If you have any problem ~~~ If you have any problem for STEX exercise new bikes, please contact our sales dealer or our service center by phone or E-mail. In order to speed our response to your particular situation, please have the following information available...
  • Page 4 3. Part manual 3-1 Leveller assembly (#1) – S25U Series 3-1 Description Parts Parts No. Q’TY Remark Leveling foot 301002 4 ea Moving wheel 301003 2 ea Hex head 300034 2 ea M10 x 45L Nut-Nylon Insert lock 300024 2 ea Pl_Footcap support.
  • Page 5 3-2 Crank shaft / Pulley assembly (#2) – S25U Series 3-2 Description Parts Parts No. Q’TY Remark Ass’y Crank housing 301006 1 ea Ball bearing 300157 2 ea 6205ZZ Ass’y Crank shaft 301007 1 ea Snapring 300152 1 ea Shaft 25...
  • Page 6 3-3 Motor / Idler assembly (#3) – S25U Series 3-3 Description Parts Parts No. Q’TY Remark Hybrid Generator 301011 1 ea Hex. Socket head 300089 4 ea M6 x 15L (SEMS) BRK_Idler 301012 1 ea Roller Idler 0001 32M2-MS031 1 ea...
  • Page 7 3-4 Power board assembly (#4) – S25U Series 3-4 Description Parts Parts No. Q’TY Remark BRK_Power board 301016 1 ea Power board 201006 1 ea Machine pan head 300057 4 ea M4 x 8L (SEMS) Machine pan head 300040 2 ea M5 x 12L (SEMS) <...
  • Page 8 3-5 Gas cylinder / Seat assembly (#5) – S25U Series 3-5 Description Parts Parts No. Q’TY Remark DU Bush 301021 1 ea Gas cylinder 301055 1 ea Rubber cylinder cap 301058 1 ea Ass’y seat supp. Frame(up) 201121 1 ea...
  • Page 9 3-6 Mold sub cover assembly (#6) – S25U Series 3-6 Description Parts Parts No. Q’TY Remark Ass’y Mold Sub cover L 201116 1 ea Ass’y Mold Sub cover R 201115 1 ea Tapping pan head 300071 4 ea M5 x 10L...
  • Page 10 3-7 Foot cover assembly (#7) – S25U Series 3-7 Description Parts Parts No. Q’TY Remark Mold Foot cover 301024 1 ea Machine pan head 300040 2 ea M5 x 12L (SEMS) Mold Foot cover 301024 1 ea Machine pan head...
  • Page 11 3-8 Main cover assembly (#8) – S25U Series 3-8 Description Parts Parts No. Q’TY Remark Ass’y_U Main cover L 201010 1 ea Ass’y_U Main cover R 201007 1 ea Mold Main cover cap 301037 1 ea Ass’y Ext. Input board...
  • Page 12 3-9 Pedal assembly (#9) – S25U Series 3-9 Description Parts Parts No. Q’TY Remark PL Crank connector 301050 2 ea Crank Arm L 201128 1 ea Crank Arm R 201127 1 ea Crank pedals 301049 2 ea Washer Flat 300010 2 ea Hex.
  • Page 13 3-10 Display console assembly (#10) – S25U Series 3-10 Description Parts Parts No. Q’TY Remark Mold_ Fast Track bottom 301061 1 ea Machine pan head 300065 2 ea M5 x 12L (SEMS) Ass’y Front handle(UP) 0001 201029 1 ea Hex. Socket head...
  • Page 14 3-11 Display console assembly (#11) – S25U Series 3-11 Description Parts Parts No. Q’TY Remark Ass’y Display conlsole 201033 / 201035 / 1 set (S25U / S25UX / S25UXi) 201114 Machine pan head 300065 5 ea M5 x 12L (SEMS)
  • Page 15 3-12 Display console assembly (#12-1) – S25U 3-12 Description Parts Parts No. Q’TY Remark Mold_ Console front cover 01 301084 1 ea Display board 201039 1 ea Tapping pan head 300051 6 ea M4 x 8L Mold_ Front board cover 0002...
  • Page 16 3-13 Display console assembly (#12-2) – S25UX 3-13 Description Parts Parts No. Q’TY Remark Mold_ Console front cover 03 301085 1 ea Mold_ Front board cover 0002 201066 1 ea BRK Front board 301103 1 ea Multi board 201126 1 ea Machine pan head 300057 2 ea...
  • Page 17 3-14 Display console assembly (#12-3) – S25UXi 3-14 Description Parts Parts No. Q’TY Remark Mold_ Console front cover 03 301085 1 ea Mold_ Front board cover 0002 201066 1 ea BRK Front board 301103 1 ea Multi board 201126 1 ea Machine pan head 300057 2 ea...
  • Page 18 3-15 Circuit Diagram – S25U < 18 >...
  • Page 19 3-15 Description – S25U Parts Parts No. Q’TY Remark Display board 201039 1 ea Rev. 07 Membrane overlay 301082 1 ea Wire_D001 301086 1 ea iPOD Cable 200066 1 ea Front board 201044 1 ea Rev. F Wire_D002 301087 1 ea...
  • Page 20 3-16 Circuit Diagram – S25UX < 20 >...
  • Page 21 3-16 Description – S25UX Parts Parts No. Q’TY Remark Interface board 201040 1 ea Rev. L Wire_I005 301093 1 ea Wire_I004 301092 1 ea Wire_I003 301091 1 ea S_Scaler Comm Cable 300337 1 ea Wire_D005 301088 1 ea Wire_D003 301043 1 ea Wire_D002 301087...
  • Page 22 3-17 Circuit Diagram – S25UXi < 22 >...
  • Page 23 3-17 Description – S25UXi Parts Parts No. Q’TY Remark Interface board 201040 1 ea Rev. L Wire_I005 301093 1 ea Wire_I004 301092 1 ea Wire_I003 301091 1 ea S_Scaler Comm Cable 300337 1 ea Wire_D005 301088 1 ea Wire_D003 301043 1 ea Wire_D002 301087...

  • Page 24: Assembly Instructions

     DO read the entire operation manual prior to operating this machine as this is essential for proper use.  DO verify the contents of the delivery prior to setting the machine. If any parts are missing, contact STEX(Sales dealer or our service center) at the number listed in the operation manual. Save the shipping cartons in case of return.
  • Page 25 Accompanying parts Models Parts Q’TY S25U S25UX S25UXi ○ ○ ○ Display console support column ○ ○ ○ Hexagon socket head // (SEMS)M620L ○ ○ ○ Fast track_bottom cover ○ ○ ○ Pan head screw // (SEMS)M512L ○ ○ ○...
  • Page 26 Assembly procedures  S25U 1. Check the contents//Accompanying parts, required tools, & others… 2. Secure the DISPLAY CONSOLE SUPPORT COLUMN(1). 1) Open the FRONT CAP(A) of the base frame. 2) Feed the wires through the DISPLAY CONSOLE SUPPORT COLUMN(1). 3) Slide the DISPLAY CONSOLE SUPPORT COLUMN over the front part of a base frame as shown.
  • Page 27 4. Secure the front HANDLEBAR(5). 1) Position the front HANDLEBAR(5) as shown. Secure HANDLEBAR using four M615mm SCREWS(6). Note: Be careful not to pinch wires. 5. Secure the FAST TRACK_TOP COVER(7). 1) Position the FAST TRACK_TOP COVER(7) as shown. 2) Connect the HEART RATE CABLE(a) and FAST TRACK CABLE(b) leading from the upper DISPLAY CONSOLE SUPPORT COLUMN to their respective locations in the back of the FAST TRACK_TOP COVER.

  • Page 28: Tapping Screws

    TAPPING SCREWS(12). 7. Secure the SEAT(13). 1) Position the SEAT(13) near the SEAT SUPPORTING BRACKET(B) of the rear base frame. 2) Secure the SEAT using three M820mm SCREWS(13). Note: Tighten the SCREWS securely. 8. Attach the CUP HOLDER(15). 1) Position the CUP HOLDER(15) as shown. 2) Secure the CUP HOLDER using one M512mm SCREW(16).
  • Page 29 10. Connect external wires. f: FITNESS NETWORK: RS-232(optional) g: 12V POWER < 29 >...
  • Page 30 Assembly procedures  S25UX//UXi 1. Check the contents//Accompanying parts, required tools, & others… 2. Secure the DISPLAY CONSOLE SUPPORT COLUMN(1). 1) Open the FRONT CAP(A) of the base frame. 2) Feed the wires through the DISPLAY CONSOLE SUPPORT COLUMN(1). 3) Slide the DISPLAY CONSOLE SUPPORT COLUMN over the front part of a base frame as shown.
  • Page 31 4. Secure the front HANDLEBAR(5). 1) Position the front HANDLEBAR(5) as shown. 2) Secure the HANDLEBAR to the upper DISPLAY CONSOLE SUPPORT COLUMN using four M615mm SCREWS(6). Note: Be careful not to pinch wires. 5. Secure the FAST TRACK_TOP COVER(7). 1) Position the FAST TRACK_TOP COVER(7) as shown.
  • Page 32 4) Position the REAR COVER(11) at the back of the DISPLAY CONSOLE and secure it using four M510mm TAPPING SCREWS(12). 7. Secure the SEAT(13). 1) Position the SEAT(13) near the SEAT SUPPORTING BRACKET(B) of the rear base frame. 2) Secure the SEAT using three M820mm SCREWS(13). Note: Tighten the SCREWS securely.
  • Page 33 direction until the rocking motion is eliminated. Tighten the nut when the exercise bike is level. 10. Connect external wires. i: BROADCAST SUPPLY INPUT(COAXIAL) j: HDMI CABLE INPUT k: FITNESS NETWORK: RS-232(optional) l: 12V POWER Pre-operation check! ① Ensure that all screws are tight. ②...