Technical Specifications:

• Board Dimensions: 180 mm × 120 mm × 2.0 mm
• Layer Count: 2-layer FR-4
• Input Voltage: 230V AC / 50 Hz (single-phase)
• Output Drivers: 3 triac outputs (8A / 400V) + 2 relay outputs (16A / 250V)
• Motor Control: Universal motor speed control via phase-angle triac dimming
• Heater Output: 2300W max (via zero-crossing triac)
• Water Valve Output: 24V AC solenoid (500 mA)
• Display Interface: 7-segment LED driver (4 digits)
• User Inputs: 5 push-button inputs (optocoupler isolated)
• Operating Temperature: 0°C to +70°C
• Protection Rating: IP20 (board level, housed in appliance)
• Firmware: Stored in on-board EPROM (27C256, 32KB)

Functional Features:

• Programmable cycle selection via EPROM-stored wash/rinse/spin profiles
• Water level detection via pressure switch input (dry contact)
• Door interlock monitoring (safety lock input)
• Imbalance detection for spin cycle (vibration sensor input)
• Error code display via 7-segment LED

Material Composition:

• Substrate: FR-4 (TG135)
• Copper Weight: 35 µm
• Surface Finish: HASL lead-free
• Key ICs: Triac driver (MOC3021 optotriac), MCU (8-bit OTP), Voltage regulator (7805)

Working Principle:
AC mains is fed through an EMI filter to the triac-based power stage. The MCU reads user inputs and sensor states, then fires triacs at precise phase angles to control motor speed and heater power. The zero-crossing detector ensures clean switching. The EPROM contains all program logic for appliance cycles.

Advantages & Highlights:

• Fully isolated user interface — optocoupler separation between high-voltage and low-voltage sections
• Self-diagnostic capability — reports 12 distinct error codes
• Universal motor compatible — works with both AC and DC universal motors
• Compact design fits standard appliance control cavities

Applicable Industries:

• Washing machines (front-load and top-load)
• Dishwashers
• Tumble dryers

Installation Requirements:

• Mount on vibration-damping rubber grommets inside appliance chassis
• Route all high-voltage wiring through separated cable channels from low-voltage signals
• Connect waterproof connectors for any external sensor wiring

Usage Precautions:

• Replace with identical part number PC-0984-780 — EPROM firmware is not interchangeable
• Verify door interlock continuity before energizing
• Do not bypass any safety input circuits (door lock, water level)
• Perform insulation test (500V DC megger) after installation