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STAT
IM 2000/2000S
Service Guide
96-106775 Rev 5.0
7. Electrical and Electronic Components
STAT
IM
5000/5000S/5000 G4 Service Guide
Removing the controller board assembly
To remove the controller board assembly, proceed as follows:
NoTe: exercise extra caution. The thermocouple leads at the board end are very fragile.
1.
b.
For all boards up to and including Rev. 6.x —
• Detach pressure interface board (1) to access thermocouple wires (S class units only),
or if a validation thermocouple is present (later or upgraded non S units) detach the
validation thermocouple interface board.
Note that on some non S units where no
validation thermocouple is present, there may be a printer cable attached in this
socket. Remove this if present.
• Disconnect the steam generator thermocouple wires (2) from controller board terminal
positions Y and -R.
• Disconnect the chamber thermocouple wires (4) from controller board terminal
position CY and -R.
• Disconnect the ground terminal (3) from the position marked BOILER. Disconnect the
ground terminal (5) from the position marked CHAMBER. Retain the ground terminal
screws. Leave the screws with contact washers in the terminals. Carefully bend the
leads so they do not contact the controller board when it is removed.
Figure 3
Figure 4
1
5
4
3
2
1. Pressure transducer interface
2. Steam generator terminals
3. Boiler ground terminals
4. Chamber thermocouple terminals
5. Chamber ground terminals
