Bosch B20CS50 Series - TROUBLE DIAGNOSIS; Faulty Start (F;R lights OFF, F-PCB Power OFF)

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1) Insert a flat tip driver into the left down groove of panel frame and snap it out smoothly.
2) Separate 2 housings (10pin & 7pin) from Front PCB. (Do not hold only wires to pull out.)
3) Unscrew (7 points) to remove Front PCB.
* Follow the reverse order when assembling.
※ How to replace Front PCB
Start
Power input to
Main PCB is ok?
Main PCB Fuse is
disconnected?
Voltage
(DC12V/14.5V/5V) on
Main PCB is OK?
Wire connection
of Front PCB is OK?
Check power connection
from machine compartment
to CN1 of Main PCB.
Change Front PCB AS.
Change Main PCB
Change the fuse
(AC250V 3.15A)
(on the Main PCB)
N
Y
N
Y
Y
N
Y
N
Checkup and connect
Front PCB wires.
8-1. Faulty Start (F/R lights OFF , F-PCB Power OFF)
8. TROUBLE DIAGNOSIS