File:Phihong PSM-5341 schematic, primary side (Mega STE copy).png

The left half of Phihong's schematic of the PSM-5341 power supply (drawing PES-30391, revision 01), from the copy marked "Mega STE": the mains input with switch SW, fuse F1 (2 A 250 V), line filter NF and PT (10SP005L), the bridge D1–D4 (1N5395), the reservoirs C6 (120 µF 400 V) and C7 (10 µF 400 V), the start-up resistors R1 and R2, the UC3844 controller IC1 with its supply capacitor C8 (100 µF 25 V), the MOSFET Q1 (marked MTP6N60 on the clearer copy on page 8) with current-sense resistor R13 (0.33 Ω), the optocoupler PC111 and the start of the secondary side. Handwritten notes on the copy give measured voltages, including "300V Gleichspannung" at the reservoir and the voltages on the pins of IC1. Rendered from page 6 of File:Phihong PSM-5341 Power Supply Specification and Schematic.pdf.

File:Phihong PSM-5341 Power Supply Specification and Schematic.pdf, page 6 (rendered 2026-10-25), from exxos's copy at https://www.exxosforum.co.uk/atari/last/psu/index.htm.

Phihong Enterprise Co., Ltd.; handwritten notes by an unknown owner of the copy.

Copyright Phihong Enterprise Co., Ltd. Hosted for preservation and repair reference, with the source cited.