1 689 975 254 2014-01-14| Robert Bosch GmbH
28 | CRR 120 | Information on fault rectification / component replacementen
7.4 Checking fuse / diode
Fig. 13: CRR 120 fuse, diode
The fuse 5 X 20 0.5 A slow-blow (Fig. 13, Pos. 2) and
the diode 1N4007 (Fig. 13, Pos. 1) for reverse polarity
protection are located between the red socket (Fig. 13,
Pos. 3) and terminal 2 of the terminal strip X1 (Fig. 6).
If the fuse is OK and no supply voltage is measured at
terminal 2, the diode is defective.
7.5 Checking display module
Fig. 14: CRR 120 display module
1. Switch on the power supply. The pressure switch
PM1 must have switched.
2. Check the 24 V power supply at the display module
terminals. Replace the display module if voltage is
being applied and there is no display. If voltage is
not being applied: Check the cable.
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