ERS AirCool plus - Changing Power Transistors; Changing Power Amplifier NB1

ERS
®
Manual / AirCool
®
plus -System / SP72_TA1C8 / -55°C +200°C / Ver. 02.02 46
11.1 Error handling
11.1.1 Changing the power transistor
Explanation: 1 = Screws M3 x 12
2 = Power transistor MJ 11033
3 = Heat sink compound
4 = Power transistor MJ 11033
Procedure:
1.
2. Open screws (1)!
3. Remove the transistors (2) and (4) from sockets!
4. Replace both transistors with new parts of the same type!
Use heat sink compound!
5. Fasten screws (1)!
12
3
4
1
M
J
1
1
0
3
3
M
J
1
1
0
3
3
Fan
E
B
1
A
Fig. 11.1.1a Fan
Fi
g
. 11.1.1b Detail A/ Power transistors
Danger
Switch off and disconnect from mains before servicing!