Kenwood Chef A901 Repair Manual

The Kenwood Chef A901 is a professional-grade stand mixer featuring a powerful 1000W motor, planetary mixing action, stainless steel bowl, multiple speed settings, and various attachments for kneading, whisking, and mixing. This repair manual covers disassembly, troubleshooting, part replacement, and maintenance procedures for the A901 model. Below are key sections for safety, components, troubleshooting, repair procedures, and maintenance.

1. Safety Precautions 2. Technical Specifications 3. Component Overview 4. Common Issues & Troubleshooting 5. Disassembly Procedures 6. Motor Replacement 7. Gear Assembly Repair 8. Speed Control System 9. Electrical System 10. Reassembly Guide 11. Maintenance Schedule

Safety Precautions

Before attempting any repairs, ensure proper safety measures are followed.

Safety Measure	Description
Power Disconnection	Always unplug mixer before disassembly
Static Protection	Use anti-static wrist strap when handling PCBs
Tool Safety	Use insulated tools for electrical components
Component Handling	Handle gears and moving parts with care
Work Area	Clean, well-lit workspace free from moisture

Technical Specifications

Motor Power: 1000W AC motor
Speed Settings: 8-speed electronic control
Bowl Capacity: 6.7L stainless steel
Planetary Action: 3-dimensional mixing
Attachments: K-beater, dough hook, whisk
Power Supply: 220-240V, 50Hz
Dimensions: 300mm x 250mm x 380mm
Weight: 8.5kg

Component Overview

Key components: Main motor assembly, gear transmission system, speed control PCB, bowl support mechanism, attachment hub, and housing.

Component	Function
Main Motor	Provides mixing power
Planetary Gear	Transmits motion to attachments
Speed Control PCB	Regulates motor speed
Bowl Support	Holds mixing bowl in position
Attachment Hub	Connects various attachments
Housing	Protects internal components

Common Issues & Troubleshooting

Symptom	Possible Cause	Corrective Action
Motor not starting	Power supply, brushes, PCB	Check power cord; inspect motor brushes; test speed control PCB
Unusual noise	Worn gears, bearings	Inspect planetary gears; replace worn bearings
Speed fluctuation	Speed control, motor issues	Test speed control PCB; check motor windings
Attachment not locking	Worn hub, spring mechanism	Replace attachment hub; check spring tension
Overheating	Motor overload, ventilation	Clean ventilation ports; check for binding in gear train

Disassembly Procedures

Step-by-step disassembly guide for accessing internal components.

Remove bowl and attachments: Ensure mixer is unplugged.
Remove housing screws: 8 screws located around base and rear.
Separate housing halves: Carefully pry apart upper and lower sections.
Access internal components: Identify motor, gears, and PCB assembly.
Document wire connections: Take photos before disconnecting wires.

WARNING! Handle plastic clips carefully to avoid breakage.

Motor Replacement

Procedure for replacing the main 1000W motor assembly.

Disconnect power and disassemble housing as per section 6.
Remove motor mounting bolts: 4 bolts securing motor to frame.
Disconnect wiring: Note wire positions before removal.
Remove old motor: Lift straight out to avoid damage.
Install new motor: Align mounting holes and secure bolts.
Reconnect wiring: Follow original wiring diagram.
Test operation: Brief test without load before reassembly.

Gear Assembly Repair

Repair and replacement of planetary gear system components.

Gear Component	Replacement Procedure
Planetary Gear	Remove retaining clip; press out old gear; press in new gear
Bevel Gears	Remove motor assembly; replace worn bevel gears
Bearing Sets	Press out old bearings; press in new sealed bearings
Gear Shafts	Inspect for wear; replace if scoring is present

Speed Control System

Troubleshooting and repair of electronic speed control system.

Test power input: Verify 240V AC to control board.
Check triac operation: Test with multimeter for proper switching.
Inspect capacitors: Look for bulging or leakage.
Test potentiometer: Check for smooth resistance change.
Replace control PCB: If components are damaged beyond repair.

CAUTION! High voltage present even when unplugged - discharge capacitors.

Electrical System

Wiring diagram and electrical component testing procedures.

Main Power: 240V AC input through 13A fuse
Motor Circuit: Triac-controlled AC motor
Control Circuit: Low voltage control PCB
Safety Interlocks: Bowl position and attachment sensors

Reassembly Guide

Step-by-step reassembly following repair procedures.

Install internal components: Ensure all gears are properly meshed.
Reconnect wiring: Follow documented wire positions.
Join housing halves: Align clips and screw positions.
Secure housing screws: Tighten evenly in cross pattern.
Final testing: Test all functions before returning to service.

Maintenance Schedule

Recommended maintenance intervals for optimal performance.

Maintenance Task	Frequency	Procedure
Gear lubrication	Every 2 years	Apply food-grade grease to gear teeth
Bearing inspection	Annual	Check for smooth rotation; replace if noisy
Brush replacement	Every 5 years	Replace motor brushes when 50% worn
Electrical check	Annual	Test insulation resistance; check connections
Cleaning	After each use	Wipe exterior; clean attachment hub