Bosch 800 Series Manual de servicio - Página 18

Imprimir página

the module bracket from the 3 slots in the chassis.

Always reset the oven and test after changing the control module. In

some cases, a second reset may be necessary.

4.10

Power Supply Module

The power supply module (9.6V 12.5W) provides DC voltage to the

control module and user interface.

4.11

Halogen Light Transformer(s)

One transformer (120V-12V 40VA) is utilized per cavity. Triac

switches 120 VAC to the transformer. There are 4 terminals on the

new transformer, as shown in Figure 16.

The resistance between the primary terminals should measure ~12.8

ohms and the resistance between the secondary terminals should

measure ~0.32 ohms.

X105-6

X205-4

LINE

Terminal

Block

Figure 17 Halogen light transformer

Secondary

LINE

Terminals

Primary

LOAD

Terminal

LOAD

4.12

Convection Fan Motor

The convection fan motor is 120V 29W. To test the motor, check for

120V across X105 / Pin 2 (upper/single) or X205 / Pin 1 (HBL8650)

and chassis ground or neutral.

The motor is accessible from the rear, after removing the rear outer

sheet metal panel.

1. Disconnect the 2 wires from the motor terminals.

2. Remove 3 T20 screws from the arms of the motor assembly.

3. Use a tap and a hammer to dislodge the assembly from the

clips that secure it to the rear of the unit. (Position tap on the

arm secured by the rightmost clip.)

4.13

Bake Element (Upper Oven)

Refer to the Strip Element Diagram to test the element (240V 2000W)

at the control module, or disconnect the wires from the terminals and

use a meter to check for a reading of ~29 ohms.

To clear a path for removing the bake element, it is necessary to

remove the vertical air channel(s) and disconnect wires. Before

proceeding, note the position of the wires.

4.13.1

Removing the Bake Element

Pull wires out of plastic purse locks attached to upper and

lower vertical air channels.

Remove upper air channel (4 T20 screws).

To create a pathway for the bake element, disconnect OR

wires from upper and lower bake element terminals; YE from

convection element terminals, BU/WH, BU, and WH from

cooling fan motor.

Drape the wires/harnesses to the side so they do not block the

element as it is pulled out.

Remove the screw between the element terminals.

Service Manual for Bosch Built-in Wall Ovens

Page 18 of 36