Bunn FPG-2 Manual De Usuario

SERVICE (Cont.)

Control Board (Model MHG)

Location:

The control board is located on the component

mounting bracket mounted to the grinder base inside

the front access panel. The bracket can be removed by

loosening the two 8-32 screws securing the bracket to

the grinder base.

Test Procedure:

1. Press and hold the upper right hidden button to

enter the Programming menus.

2. Scroll to SERVICE TOOLS menu, and press the

button under "YES".

3. Press "YES" under TEST OUTPUTS and

proceed,through the menus to test the left and

right gates, and the grinder motor.

4. Then scroll to the TEST FREQUENCY menu and

press the button under "YES".

5. Observe the left, right and center frequency

screens, they should read between 124.0 and

126.0 khz.

6. Should any of the outputs or frequency tests fail,

first check the continuity of the wiring between the

component and the control board. Then test the

individual component before replacing the control

board.

FIG 53 CONTROL BOARD

FIG 54 CONTROL BOARD TERMINALS

Removal and Replacement

1. Disconnect the grinder from the power supply.

2. Remove the front access panel.

3. Remove all wires from the control board termi-

nals.

4. Remove the bracket and control board by remov-

ing the two 8-32 screws securing the bracket to

the grinder base.

5. Remove the six 8-32 screws attaching the control

board the the component bracket.

6. Remove the six spacers from the old control board

and discard the control board.

7. Install the six spacers to the new control board

8. Attach the control board to the component bracket

using the six screws previously removed.

9. Position the bracket and control board assembly

in the grinder base and secure with the two 8-32

screws.

10. Reconnect the wires to the control board.

J12

J16

MOV4

TH3

MOV3

TH2

MOV1

MOV2

TH1

J13

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