HD7857/20 / HD7857/21
7-24
REPAIR INSTRUCTION
Boiler / Brew chamber
1. Brewhead sensor wire must be taped as far away from
the boiler wires as possible. (EMC)
2. Boiler wires over the boiler, not behind or in front of
the boiler. (Safety)
2
1
PCBA – Ty wraps
After PCBA replacement:
1. Ty-wrap Black, Yellow and White lead close to the
connection of the white lead on the PCBA. (Safety)
2. Ty-wrap Black, Yellow, White, Blue and Red lead close
to the connection of the red lead on the PCBA.
(Safety)
3. Ty-wrap Black, Yellow, White, Blue, Red and 4x brown
close to the connection of the lowest two brown
wires on the PCBA. (Safety)
1
3
2
Cordset, Earthwire and Thermoblock
1. Ferrite bead must be in place and ty-wrapped to lter
out interference. (EMC)
2. “Clean” Brown and Blue wire must be ty-wrapped to
Earth-wire close the Thermo-block. Earth-wire must
be as far away from the cord-set as possible. (EMC)
3. Two Black fuse-wires to Thermo-block must run
horizontal to the right, running behind the Steam-
pump. (Safety)
3
2
1
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