The service manual details the rear amplifier module's interface:
This is a technical guide based on the standard maintenance procedures for Beta 3 series pressure washers. Beta 3 U15a Service Manual
[AC Input] → [EMI Filter] → [SMPS PSU] → ±15V (low current) & ±55V (high current) ↓ [Balanced XLR Input] → [Op-amp buffer] → [Electronic Crossover] → [LF DSP/Limiter] → [Class D Amp] → LF Driver → [HF DSP/Limiter] → [Class AB Amp] → HF Driver The service manual details the rear amplifier module's
If water is leaking from the pump head (around the pistons), the seals (packings) need replacement. and how the resolves them.
Based on field reports and service center data, here are the five most common issues, and how the resolves them.