If this refers to a specific PCB, power supply module, radio device, or industrial control board, I recommend:
Toshiba Portégé A30-D: Newer iterations (A4355A) also utilize this board architecture. Repair & Schematic Resources Mdk Mb-17 W Schematic
This is the most challenging part. The Mdk Mb-17 W is not a mass-market consumer device; it is a sub-assembly. Therefore, you will rarely find it as a standalone PDF. Instead, it is buried inside larger service manuals. Here are proven sources: If this refers to a specific PCB, power
While the exact PCB layout may vary by batch, the MB-17 generally follows the simplified 4-transistor JLH Class A circuit per channel. Find power input, speaker outputs, inputs (R/L), and
Voltage Regulators: Look for ICs labeled with 78XX or LMXX series numbers.