Circuit Diagram; Exchanging The Motherboard/Processor Board - Bosch RTM 430 Instandsetzungsanweisung

5.3.2 Circuit diagram

5.4 Exchanging the mother-
board/processor board
5
230V 14.5V 6,7,8
10V
8 AT
4,5
4
110V
10V
10,11,1
14.5V
3
-15V
0V 2
8 AT
1
+15V
MTM
Gnd
2
RS 232
TxD
3
RxD
1
Shield
– Unplug the connection lead connecting the RTM 430 to the emission system analyzer
or emission analysis module.
– Place the RTM 430 (on a clean surface) on its back.
– Remove the cover caps on the left and right-hand sides of the RTM 430 (Figure 2,
Item 1).
– Unscrew the two countersunk-head screws on the rear side of the unit.
– Unscrew the four securing screws on the underside of the unit (Figure 2, Item 2).
– Carefully pull the housing cover to the rear and place it down (the ventilators are simply
slid into a guide and are not screwed in place).
– Remove the four securing nuts of the PCB cover using a size 7 socket wrench (Figure
2, Item 3).
! The RTM must have been disconnected from the electrical power supply in order to
prevent the risk of short circuit between PCB cover and Triac.
– Turn the PCB cover so that the opening points upwards.
– Remove the rubber grommet from the PCB cover (Figure 2, Item 4).
– Carefully cut open and remove the cable ties (Figure 2, Item 5).
– Unplug all leads on the PC board and, when doing this, carefully detach the connection
leads to the coaxial cables on emitter and receiver using a pair of flat-nosed pliers.
– Remove defective PC board.
– Plug all leads onto the new PC board (Figure 2).
– Insert the rubber grommet at the opening provided in the PCB cover (Figure 2,
Item 4).
– Secure the PCB cover to the threaded bolts using the four securing nuts (Figure 2, Item
3) using a size 7 socket wrench.
The PE wire must be connected as prescribed.
– Check the installation position of the ventilators. If necessary, slide the ventilators into
the guide rails (Figure 2, Item 9).
– Attach the housing cover.
– Connect the RTM 430 to the service PC and power supply unit (or emission
analysis module) using the interconnecting cable 1 684 463 389.
– Carry out a function check of the RTM 430 with the "Test functions" menu
(Chapter 6.3).
– If necessary, set the RTM 430 to the country-specific parameters in the "Read and
set service-parameters" and "Service-program settings" menu (Chapters 6.2
and 6.8).
1,2,3 1,2,3
6,7,8
4,5 4,5 4,5
10,11,1 7,8,9 7,8,9
analog
11 11
2
RxD
10 10
3
TxD
1
12 12
SubD, 15 pin AMP, 16 pin
Chamber
heater
100W
28V
K1
EEPROM
-9V +9V +12V
analog
+5V
1 688 400 048
Processor
459601/3CK
M
M
57