Repair
20
309813B
Temperature Control Board
2.
Relieve pressure, page 11.
3.
Refer to electrical diagrams. Temperature control
board is on left side inside cabinet.
4.
Put on static conductive wrist strap.
5.
Disconnect all cables and connectors from board,
F
6.
Remove nuts and take entire temperature control
assembly to workbench.
7.
Remove screws and take board off heatsink.
8.
Install new board in reverse order. Apply thermal
heatsink compound to mating surfaces of board and
heatsink.
Temperature control board has seven green
LEDs. Power must be on to check. See F
. 4 for
location.
Table 2: Temperature Control Board LEDs
LED
Status
Function
D26
blinks
Board powered
D14
on
Zone A turned on
D13
cycles on
and off
Zone A powered, LED
cycles as temperature
cycles
D18
on
Zone B turned on
D19
cycles on
and off
Zone B powered, LED
cycles as temperature
cycles
D27
on
Hose zone turned on
D15
cycles on
and off
Hose zone powered, LED
cycles as temperature
cycles
CAUTION
Before handling board, put on a static conductive wrist
strap to protect against static discharge which can
damage board. Follow instructions provided with wrist
strap.
1.
Turn main power OFF
. Disconnect power
supply.
WARNING
Read warnings, page 8.
Order Part No. 110009 Thermal Compound.
Table 3: Temperature Control Board Connectors
Connector
Pin
Description
J1
1, 2
Overtemperature switch A
3, 4
Overtemperature switch B
5, 6
Current sensor
7
Temperature sensor A, red
8
Temperature sensor A, yellow
9
Not used
10
Temperature sensor B, red
11
Temperature sensor B, yellow
12
Thermocouple, silver
13
Thermocouple, red
14
Thermocouple, purple
J2
n/a
To A heaters
J5
n/a
To display board
J8
n/a
Data reporting
J9
n/a
To B heaters
J13
n/a
To heated hose