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Sharp AF-T908X - User Manual

Sharp AF-T908X
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AF-T908X
AF-R908X
AF-R1108X
AF-R1208X
AIR CONDITIONER
S6830AFR128X/
SERVICE MANUAL
Page
SPECIFICATIONS ................................................................................................................................................ 2
WIRING DIAGRAM ............................................................................................................................................... 3
EXTERNAL DIMENSIONS................................................................................................................................... 4
OPERATION INSTRUCTIONS ............................................................................................................................ 4
INSTALLATION INSTRUCTIONS ........................................................................................................................ 7
DISASSEMBLING PROCEDURE ...................................................................................................................... 10
HOW TO REPAIR REFRIGERATION ................................................................................................................ 14
ELECTRICAL COMPONENT TEST.................................................................................................................... 16
MICROCOMPUTER CONTROL SYSTEM.......................................................................................................... 17
TROUBLESHOOTING GUIDE ............................................................................................................................ 24
RUNNING CONDITION ...................................................................................................................................... 28
PACKING AND ACCESSORIES......................................................................................................................... 29
REPLACEMENT PARTS LIST ............................................................................................................................ 30
TABLE OF CONTENTS
AF-T908X
AF-R908X
AF-R1108X
AF-R1208X
MODELS
SHARP CORPORATION This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
In the interest of user-safety the air conditioner should be restored to
its original condition and only parts identical to those specified should
be used.

Table of Contents

Questions and Answers

  • D
    Dawn EllisAug 16, 2025
    Why is my Sharp AF-T908X not cooling sufficiently?
    • A
      Andrew AcostaAug 16, 2025
      If your Sharp Air Conditioner isn't cooling enough, there might be several reasons: * The set temperature is too high: Lower the set temperature. * The air filter is clogged: Clean the air filter. * There's an added heat source: Remove the heat source. * Windows and doors are open: Ensure windows and doors are closed. * There is an object obstructing the air conditioner or the air conditioner is located near a heat source: Remove the object or move the air conditioner. Additionally, consider calculating the heat load, cleaning the coils with a steam cleaner, and checking the sealed system.
  • J
    John ShepardAug 19, 2025
    Why is my Sharp AF-T908X not cooling at all?
    • J
      James ThompsonAug 19, 2025
      If your Sharp Air Conditioner isn't cooling, possible causes include: * **Gas leak:** Repair the gas leak and recharge the system. * **Defective compressor:** Replace the compressor. * **Capillary tube restriction:** Replace the capillary tube. Also, check for any defects and repair or replace the faulty components. Improve ventilation and avoid direct sunshine. Calculate the cooling load and change or remove any heat sources.
  • E
    Emily ThomasAug 22, 2025
    What to do if neither the fan motor nor the compressor operate on my Sharp AF-T908X?
    • E
      Edward DavilaAug 22, 2025
      If the fan motor and compressor of your Sharp Air Conditioner aren't working, check the following: * **Fuse or circuit breaker:** If the fuse is blown or the circuit breaker is open, and they seem normal, consult your power supply company. * **Plug connection:** Ensure the plug is properly connected. * **Defective contact:** If the plug is connected but the contact is defective, replace the power supply cord with a plug. * **PWB ass'y fuse:** If the PWB ass'y fuse is open, replace the fuse.
  • C
    Caitlin DavisAug 26, 2025
    What to do if the fuse or circuit breaker keeps opening on my Sharp Air Conditioner when set to cooling?
    • T
      timothy60Aug 26, 2025
      If the fuse or circuit breaker opens when your Sharp Air Conditioner is set to cooling, it could be due to: * **Insufficient fuse capacity:** Change to a fuse with the correct rating. * **Compressor locked:** Replace the compressor. * **Burned out compressor terminal/lead:** Solder the terminal or replace the compressor. * **Defective circuit insulation:** Replace the compressor. Also, ensure the circuit breaker is turned "ON" and repair any power source cut-offs or defective contacts.
  • D
    Dan ClaytonAug 28, 2025
    Why does the fan motor run, but the compressor doesn't operate on my Sharp AF-T908X Air Conditioner?
    • R
      Ricky ShawAug 28, 2025
      If the fan motor runs but the compressor doesn't operate on your Sharp Air Conditioner, it may be due to: * **Defective overload relay:** Replace the overload relay. * **Burnt out compressor coil:** Replace the compressor. * **Disconnected or burnt out wiring:** Connect the wiring.
  • D
    denniscamachoAug 31, 2025
    What to do if the fan motor doesn't operate on my Sharp Air Conditioner when set to 'Fan only'?
    • M
      mark75Aug 31, 2025
      If the fan motor of your Sharp Air Conditioner doesn't operate when the selector switch is set to "Fan only", consider the following: * **Connector open (CN1):** Joint the connector CN1. * **Crack at solder part of CN1:** Over solder. * **Defective fan capacitor:** Replace the capacitor. * **Defective fan motor:** Replace the fan motor. * **Low power supply voltage:** Improve the power supply equipment.
  • N
    Nathan RodriguezSep 3, 2025
    Why does the compressor try to start but fail on my Sharp Air Conditioner?
    • T
      Theresa MckenzieSep 3, 2025
      If the compressor of your Sharp Air Conditioner tries to start but fails, it could be due to: * **Low power source voltage:** Improve the power supply. * **Undersized wiring for power supply equipment:** Improve the power equipment.
  • S
    sandrayoungSep 6, 2025
    What causes the compressor to operate but the fan not to rotate in my Sharp AF-T908X?
    • A
      Anita HaneySep 6, 2025
      If the compressor operates in cooling mode but the fan doesn't rotate on your Sharp Air Conditioner, check for: * **Connector open CN1:** Joint of connector CN1. * **Defective capacitor:** Change capacitor. * **Defective fan motor:** Change fan motor.
  • K
    Kristopher WilliamsSep 9, 2025
    What to do if the PWB ass'y does not operate on my Sharp Air Conditioner?
    • J
      Jennifer WagnerSep 9, 2025
      If the PWB ass'y of your Sharp Air Conditioner does not operate: * If the fuse (FU1) is open, change the fuse (FU1). * If there is a secondary voltage issue with the transformer (TR), change the PWB ass'y.
  • A
    Angela LittleSep 12, 2025
    Why does the compressor not turn off on my Sharp Air Conditioner?
    • J
      Jon PetersenSep 12, 2025
      If the compressor on your Sharp Air Conditioner does not turn off, it could be due to a defective compressor relay. In this case, change the relay or replace the PWB ass'y.

Summary

Specifications Overview

Electrical Data

Details electrical characteristics like voltage, current, power factor, and EER for different models.

Compressor Specifications

Information about the compressor type, model, and wattage.

Refrigerant System Details

Specifies evaporator, condenser, and refrigerant type and volume.

Unit Dimensions and Weight

Provides net and gross dimensions, and weight of the unit.

Fan System and Others

Details fan types, air flow rates, safety devices, and filter information.

Wiring Diagram and Component Tests

Fan Motor Resistance Testing

Instructions and resistance values for testing indoor and outdoor fan motors.

Megger Insulation Testing

Guidance on performing insulation resistance tests on motors.

External Dimensions

Operation Instructions

Parts Names Identification

Identifies and labels the various parts of the air conditioner unit.

Basic Unit Operation

Overview of how to operate the air conditioner and its controls.

Control Panel Functions

Cooling Operation Procedure

Step-by-step guide to operating the air conditioner in cooling mode.

Adjusting Temperature Settings

Instructions for adjusting the desired temperature setting.

Advanced Operation Modes

Changing Fan Speed and Modes

How to select different fan speeds and the FAN ONLY mode.

Energy Saver Functionality

Explanation of the energy-saving feature and its operational impact.

Air Flow Direction and Installation

Adjusting Air Flow Direction

How to adjust louvers for optimal air distribution.

Exhaust Functionality

How to use the exhaust lever to vent stale air from the room.

Installation Guidelines

Instructions for installing the unit, including parts, tools, and initial steps.

Disassembling Procedure

Refrigeration Repair Fundamentals

Sealed System Repair Protocols

Guidelines for diagnosing and repairing sealed refrigeration systems.

Refrigerant Handling Safety

Crucial safety precautions when working with refrigerants and sealed systems.

Brazing and Soldering Techniques

Best practices for brazing refrigerant lines for strong joints.

Tubing Preparation for Repair

Methods for cleaning and fluxing refrigerant tubing before brazing.

System Dehydration and Leak Detection

Heating Refrigerant Tubing

Techniques for heating refrigerant tubing during brazing, focusing on flame direction.

Dehydrating the Sealed System

Importance and methods of removing moisture from the sealed system.

Refrigerant Leak Detection Methods

Methods for detecting leaks in the refrigerant system using various tools.

Electrical Component Testing

Capacitor and Overload Relay Tests

Procedures for testing capacitors and overload relays for proper function.

Compressor Electrical Tests

Steps for testing compressor continuity and insulation resistance.

Microcomputer Control System Schematic

Printed Wiring Board Layouts

Microcomputer Control System Operation

Temperature and Operation Modes

Explains temperature control, COOL, and FAN ONLY modes.

Fan Speed and Timer Settings

Details fan speed selection and timer functions for unit operation.

Energy Saver Functionality

Description of the ENERGY SAVER mode and its impact on fan operation.

System Test Mode and Thermistor Data

Safety Start Delay and Test Mode

Procedures for safe restart and entering the test mode for diagnostics.

Thermistor Resistance Characteristics

Table correlating thermistor temperature, resistance, and voltage.

Cooling Load Estimate Form Instructions

Cooling Load Estimate Form

Troubleshooting Guide: Initial Checks

Fan;Compressor Non-Operation

Steps for when the fan motor or compressor does not operate.

Insufficient or No Cooling

Diagnosing and fixing issues related to poor or absent cooling.

Troubleshooting Guide: Compressor Issues

Fan Operates, Compressor Fails

Troubleshooting when the fan runs but the compressor does not.

Compressor Short Cycle

Identifying reasons for the compressor stopping shortly after starting.

Starting and Power Issues

Diagnosing compressor start failures and fuse/breaker problems.

Troubleshooting Guide: Fan and System Issues

Fan Motor Operation Problems

Resolving issues when the fan motor does not run or circulate air.

Compressor Stops Prematurely

Further troubleshooting for compressors that stop soon after starting.

Troubleshooting Guide: Fan, Noise, and Control

Fan Failure During Cooling

Addressing problems where the compressor works but the fan does not.

Noise and Vibration Diagnosis

Troubleshooting causes of noise and vibration from the unit.

Control Circuit and Sensor Faults

Diagnosing issues with PWB, fuse, transformer, or thermistor.

Running Condition Performance Curves

Packing and Accessories Illustration

Replacement Parts List: Cabinet and Unit

Replacement Parts List: Control Box and Cycle

Replacement Parts List: Accessory Parts

Procedure for Ordering Parts

Cabinet Parts Diagram: Models AF-T908 X;AF-R908 X;AF-R1108 X

Cabinet Parts Diagram: Model AF-R1208 X

Cycle Parts Diagram: Models AF-T908 X;AF-R908 X;AF-R1108 X

Cycle Parts Diagram: Model AF-R1208 X

Control Box Parts Diagram: Model AF-T908 X

Control Box Parts Diagram: Models AF-R908 X;AF-R1108 X;AF-R1208 X

Sharp AF-T908X Specifications

General IconGeneral
BrandSharp
ModelAF-T908X
CategoryAir Conditioner
LanguageEnglish

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