Replacing The Control Module Pcb; Replacing The Temperature And Rpm Pcb; Replacing The Control-Power Transformer - Bosch BEA 150 Repair Instructions

10.26 Replacing the control module PCB

i In order to remove the control module PCB without problem,
you must first remove the exhaust-gas analyzer module.
1. Unplug all plug connections from the control module PCB.
2. Remove the two fastening screws (1).
3. Carefully pull the control module PCB out of the retaining
panel.
4. Place the new control module PCB on the retaining panel
and carefully press it onto the panel until the PCB clicks into
the holder (2).
5. Plug all plug connections back into the control module PCB.
6. Perform a function test (Sec. 5.1 - 5.6).

10.27 Replacing the temperature and RPM PCB

1. Unplug all plug connections from the PCB.
2. Remove the two fastening screws (1) from the retaining
panel on the rear of the unit.
3. Remove the fastening screw (2) from the retaining panel in
the interior of the unit.
4. Remove the earthing cable (3) from the retaining panel.
5. Unscrew the two fastening screws for the PCB (4).
6. Carefully remove the PCB from the retaining panel.
7. Place the new PCB on the retaining panel and carefully press
it onto the panel until the PCB clicks into the holder (5).
8. Screw the retaining panel and PCB in place in the unit.
9. Push the earthing cable onto the tab on the retaining panel.
10. Plug all plug connections back into the control module PCB.
11. Perform a function test (Sec. 5.1).

10.28 Replacing the control-power transformer

1. Remove transformer connection cable 2 (rd,1) from the fuse
and transformer connection cable 5 (gn,2) from the power
switch.
2. Remove the earthing cable (3) from the earthing connector
on the power switch.
3. Unplug the interconnecting cable from the plug connector X
10 (4) on the control module PCB.
4. Remove the fastening screw of the control-power transfor-
mer (5).
5. Remove the retaining disc (6) and rubber disc (7).
6. Replace the toroidal mains transformer (8).
7. Push the earthing cable onto the tab of the floor panel and
onto the earthing connector on the power switch.
8. Re-insert all connection cables.
9. Perform a function test (Sec. 10.1 u. 10.2).
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