The is a 240W power supply unit (PSU) primarily found in HP desktop systems like the Compaq 6000 and 8000 Pro series. Known for its high efficiency, it is an 80 PLUS certified component designed for small form factor (SFF) workstations. 🛠️ Repair & Reliability Review
The term “schematic top” likely refers to a or a component placement map of the PSU’s PCB. While HP does not release full circuit diagrams for proprietary power supplies, several alternative documents can serve the same purpose:
: Inspect the output filter electrolytic capacitors located on the secondary low-voltage side of the board. Look for bulged tops or test them out-of-circuit with an ESR meter . ps42419ha schematic top
For those looking for DIY repair tools or a deeper dive into similar HP PSU models like the PS-4241-9HB
[ AC Main Input: 115V / 230V ] | [ Input Fuse & EMI ] | [ Bridge Rectifier / PFC ] | +------------+------------+ | | [ Standby Circuit ] [ Main Switching Rail ] (TNY279PN Switcher) (Main Drive Transistors) | | [ Missing Standby Voltage? ] [ Missing Main 12V Rails? ] - Check 1-Ohm Resistor - Check Output Cap ESR - Replace TNY279PN - Check Optocouplers - Inspect Shunt Diodes - Verify PS-ON Shorting Issue A: Dead Standby Rail (Missing Standby Voltage) The is a 240W power supply unit (PSU)
A critical sub-section that remains active even when the PC is "off." It uses a dedicated standby voltage IC
When performing repairs, looking up a map is crucial for isolating high-voltage primary faults from low-voltage secondary logic issues. This guide breaks down the complete architecture of the PS-4241-9HA circuit, explains its top-down trace and component placement, and steps through fixing common failures. Understanding the PS-4241-9HA Technical Specifications While HP does not release full circuit diagrams
Repairing switched‑mode power supplies involves high voltages (up to 400 V DC) on primary-side capacitors even after disconnection. Only proceed if you have proper training and equipment. Bypassing protection circuits is not recommended for permanent operation and should only be used for diagnostic purposes.