The power supply board regulates line power sent directly to the fuser heating element via a solid-state triac mechanism. If the printer drops communication or returns fuser errors, map the circuit tracing backwards from the fuser connector plug down to the triac gating resistors on the PCB layout. Faded Print Quality (LVPS Bias Failure)
Typically a high-voltage N-channel MOSFET, such as the 2SK2900 . It cycles on and off rapidly to chop the high-voltage DC bus through the primary winding of the flyback transformer.
Inspect the top vent sleeve of the 400V primary filter capacitor. A convex or bulging top indicates internal outgassing, requiring replacement.
Linear or buck regulators drop the 24V down to 5V and 3.3V for the logic circuits. Look for components labeled IC (e.g., LM1117 or similar low-drop regulators) in this section of the schematic. Motor and Solenoid Drive Circuit Rm1-2316 Schematic
When reviewing the blueprint, you will encounter standardized circuit shorthand:
Provides stable DC power (typically 3.3V, 5V, and 24V) to the Formatter Board and engine controller. Zipstore.ru Common Failure Points Often caused by a blown main fuse or the failure of the safety resistor. Power Surges:
EE-RE-2024-01 Subject: Component Identification & Circuit Role of "Rm1-2316" Status: Best-Knowledge Compilation The power supply board regulates line power sent
The charts the electrical architecture of the Low Voltage Power Supply (LVPS) board found inside several classic monochrome laser printers, most notably the HP LaserJet 1018, 1020, and 1022 , alongside the Canon LBP2900 and LBP3000 series. This power board converts incoming alternating current (AC) electricity into stable, regulated direct current (DC) rails and drives the high-thermal elements required for electrophotographic laser printing.
: Safely discharge the 39μF/400V capacitor. Measure continuity across its terminals. A reading near zero ohms points to a punctured primary switching transistor.
A feedback circuit tracks resistance changes from the fuser's internal thermistor, signaling the engine controller to switch the Triac on or off to preserve safe operating temperatures. Component-Level Troubleshooting & Failure Modes It cycles on and off rapidly to chop
Technicians typically focus on these specific areas of the board when troubleshooting using a schematic approach:
| Block | Function | |-------|-----------| | | Connects to rectified DC (320V) via pin 8; provides initial charge to VCC cap. | | PWM Oscillator | Fixed frequency ~65 kHz (frequency jittering for EMI reduction). | | Current Sense Comparator | Monitors MOSFET source resistor via pin 3 (CS). | | Feedback Amplifier | Optocoupler input (from secondary side TL431) connects to pin 2 (FB). | | Soft-Start | Gradual increase of duty cycle at startup (pin 6 capacitor). | | Brownout Detector | Monitors bulk capacitor voltage via resistor divider to pin 5. | | Output Driver | Totem-pole output to external power MOSFET gate (pin 7). |
Integrated over-temperature cutoffs designed to prevent fire hazards, especially concerning the fuser power delivery. Key Specifications Specification Compatible Models HP LJ 1018 Go to product viewer dialog for this item. Canon LBP2900 Go to product viewer dialog for this item. Go to product viewer dialog for this item. Output Voltage 24V DC (typical for motor/laser) Input Voltage 110V-127V AC or 220V-240V AC (model dependent) Part Numbers RM1-2316, RM-0373, RM2-8086 (often interchangeable) Connector Type Standard 10-pin arrangement for mainboard communication Troubleshooting and Repair HP RM1-2316-000CN Power supply board assembly - Partshere
This stage chops the high-voltage DC bus into high-frequency square waves to safely step down the energy through a compact transformer.