File:Sharp MZ-80K power supply circuit (service manual).png

Schematic of the Sharp MZ-80K power supply (220 V unit DBOXD0004PAZZ), from the "Wiring Diagram of Power Supply Section" on printed page 37 of Sharp's MZ-80K service manual, rotated to read upright. It shows the mains input SO101, switch SW101, fuse F101 (T500 mA), C101 (0.047 µF 250 V) and transformer T101 with its thermal fuse; the −5 V supply (F201, D201, C201 2200 µF 16 V, regulator IC1 µA78MGU with R201 and VR201, C202 470 µF 10 V, L201, F202 T315 mA); the bridge D301 and D302 into C301 to C304 (2500 µF 35 V); the +12 V switching regulator (IC2 SG3524, Q401 2SA764, Q402 2SA673, D401 and D402, L401, C404 2200 µF 16 V, R404, L402, F401 T1.6 A, VR401) and the +5 V switching regulator (IC3 SG3524, L501, Q501, Q502, D501 and D502, L502, C507 3300 µF 10 V, R504, L503, F501 T1.6 A, VR501), with the 10 µF 35 V capacitors C401, C501, C502 and C509. The 240 V UK unit is drawn on printed page 38 with the same circuit. Full manual: File:Sharp MZ-80K Service Manual.pdf.

Rendered from PDF page 39 of File:Sharp MZ-80K Service Manual.pdf (from https://www.sharpmz.net/mz-80k/download/sm80k.pdf, retrieved 2026-10-21) at 220 dpi, cropped, rotated and converted to greyscale.

Sharp Corporation.

Copyright Sharp Corporation. Hosted for preservation and repair reference, with the source cited.