Power Supply To Power Electronics - Bosch ETT 008.31 Repair Instructions

8.16

Power supply to power electronics

The covered parts of the printed circuit board carry live voltage.
Do not remove the cover!
An auxiliary supply of AC 110 V is supplied by the transformer via connector X 1. This voltage is switched through electronically to the
pump via connector X 2.
The supply voltage P5VD is generated on the motherboard (see Section 8.17), the alternating voltage AC 22 V is supplied by the
transformer (see circuit diagram in Sections 12.1 and 12.2).
Perform the test in accordance with the table below.
Test point Measured value
X 14 MD
X 13 1.0 VAC
X 12 + 5.2 V + 100 mV
X 11 + 15 V + 1.0 V
X 10 + 24 V to 28 V
Diagram, component location diagram of power electronics
Diagram, power supply to power electronics (simplified representation)
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