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) are used on the source of the MOSFETs to monitor the current for overload protection (OCP).
Measure AC voltage across the transformer secondary windings. If you read 0V AC, the transformer winding is open or the thermal fuse inside the transformer has blown. Step 3: Test Unregulated DC Rail
The linear regulation scheme of the A20112 sheds excess voltage entirely as heat. Remove the pass transistors or IC regulators from their heatsinks, clean off the dried-out original thermal compound, and reapply fresh non-conductive ceramic thermal paste alongside new mica insulation pads. a20112 power supply schematic
A20112 Power Supply Schematic — Detailed Design, Analysis, and Implementation
If you are restoring an older device featuring the A20112 topology, consider executing a few strategic component upgrades to improve reliability and thermal performance: Replace original 85∘C85 raised to the composed with power C rated electrolytic capacitors with high-quality, low-ESR 105∘C105 raised to the composed with power C ) are used on the source of the
Low Voltage Power Supply (LVPS) board. This component is a critical power module used in several high-end HP LaserJet printers to provide stable voltage to the logic board and laser assembly. AliExpress Compatible Models a20112 / JC44-00250A board is compatible with the following HP LaserJet AliExpress Managed MFP Series : E72525, E72530, E72535 MFP Series : M72625, M72630 Color Managed Series : E77830, E77822, E77825, E77422 Key Specifications & Troubleshooting Part Numbers : Often listed as JC44-00250A JC44-00249A
Verify a clean supply voltage, typically between . GND System Signal Ground Step 3: Test Unregulated DC Rail The linear
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This report is limited to a general analysis of the 2011 power supply schematic. Future work may include:
This is the heart of the A20112 design. It typically utilizes one of two configurations depending on the revision:
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