Rear of Front Panel

A-01083

Driver PC Board

5.Note and label the two wiring connectors that con- nect to the Driver PC Board.

6.Disconnect the two wiring connectors from the Driver PC Board.

7.Press in the securing tab knob on the PC Board Guide to release the PC Board from the PC Board Guides. There is a securing tab on both the upper and lower PC Board Guides.

Upper PC Board Guide

Securing Tab

Driver PC

Board

Lower PC Board

Guide

Securing Tab

A-01084

8.Carefully pull the PC Board from the guides and remove from the unit.

9.Install the replacement Driver PC Board Assembly reversing the above procedure.

10.Locate the old Switching Transistor (Q1) Assem- bly on the inside center-left, between the four large blue capacitors, as viewed from the front of the unit.

Switching Transistor

Transistor/Coil

Bracket

Q1

 

Large Blue

A-01085

Capacitors

 

11.There are two different styles of the Switching Transistor (Q1). The style can be identified by look- ing at the top of the transistor casing.

Style With 'E' Terminal

Style Without 'E' Terminal

BXBX

B

B

E

A-01088

12.Note and label the wires connected to the Switch- ing Transistor Assembly.

NOTE

The older style transistor will have two wire con- nections to the transistor module and the newer style will have only one wire connections.

13.Remove the two screws securing the wires to the Switching Transistor Assembly terminals 'E' and 'B'.

14.Remove the screw that secures the Capacitor Mounting Bracket to the Switching Transistor As- sembly

15.Remove the screw that secures the Transistor/ Coil Bracket to the Switching Transistor Assem- bly.

16.Remove the screw and washer securing the PTC Resistor Assembly to the Main Heatsink. Move the PTC Resistor Assembly out of the way to pre- vent it from becoming damaged.

Manual 0-2533

41

REPLACEMENT PROCEDURES

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Thermal Comfort 3000 manual Bxbx
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3000 specifications

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