Phase 3: Dynamic Voltage Testing (Power On via Series Dimmer Lamp)
(Note: The "g" in v9.04g usually denotes a minor PCB revision or a silkscreen print error correction, but the core schematic remains the JDM standard.)
The heavy lifting is performed by an Insulated Gate Bipolar Transistor (commonly parts like H20R1203 , FGA25N120 , or equivalent rated at 20A–25A, 1200V). The IGBT rapidly pulses the LC tank at ultrasonic frequencies (typically 20 kHz to 35 kHz), generating the alternating magnetic field required for induction. Low-Voltage Auxiliary Power Supply (SMPS)
Sometimes the manufacturer provides application circuits that match the board design. Conclusion chk-v9.04g circuit diagram
: Includes built-in mechanisms for over-voltage , over-current , and high-temperature protection to prevent internal component failure or overheating of the cooking surface.
Protects the board from reverse polarity and inductive spikes. Optocouplers (e.g., PC817) Galvanically isolates control logic from power fields. C1, C2 Electrolytic Capacitors Smooths out low-frequency voltage ripple. 4. Common Failure Modes and Troubleshooting Diagnostics
Current transformers or voltage sensing lines check the loading effect on the resonant tank to ensure a ferromagnetic pan is present before enabling high-frequency oscillation. Phase 3: Dynamic Voltage Testing (Power On via
These boards are often produced by generic manufacturers. Schematics are rarely officially published for specific batch revisions (like "v9.04g"). However, the circuit design is standardized around the Texas Instruments TPA3116D2 chip. Below is a guide to understanding the circuit, pinouts, and troubleshooting based on the standard reference design.
The circuit board is a common, standardized mainboard used in many budget-friendly induction cooktops (often referred to as "China-common" PCB designs). If you are looking at this diagram, you are likely either repairing a dead unit or trying to understand the power delivery of an induction heater.
All such modifications must respect the flyback transformer's duty cycle limits (typically 48% max for current-mode controllers). Conclusion : Includes built-in mechanisms for over-voltage ,
When cross-referencing your physical CHK-V9.04G PCB with online schematics like the Scribd Electrical Engineering Schematics , watch for these common baseline values: Circuit Component Common Reference Value Primary Failure Mode 10A - 15A / 250V Blown due to shorted IGBT Bridge Rectifier 25A / 600V - 1000V Internal short circuit Resonant Capacitor 0.27µF - 0.33µF / 1200V DC Capacitance drop (causes no-heat) Filter Capacitor 4.0µF - 5.0µF / 275V - 400V AC Bulging or venting IGBT 20A / 1200V (e.g., H20R1202) Gate-to-Collector short circuit Auxiliary Regulator IC VIPer12A / AM-22A Dead board (no display, no beep) Troubleshooting a Faulty CHK-V9.04G Board
Technical support sections of the machine manufacturer.