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[3]
Disconnect the 9 CONNECTORS to release the 500 CIRCUIT BOARD ASSEMBLY.
[4]
Label U17 - U20 and U28. See Figure 6-16.
The 500 CIRCUIT BOARD ASSEMBLY is an exchange part. To prevent more damage, use ESD
packing materials to return the part to Parts Services.
[5]
Remove the 8 SCREWS, WASHERS, and LOCK WASHERS that hold the 500 CIRCUIT BOARD
ASSEMBLY.
[6]
Place the 500 CIRCUIT BOARD ASSEMBLY on the ESD MATT.
[7]
Remove the following:
• U17 - U20 and U28. Use the CHIP REMOVAL TOOL TL-4430.
• BATTERY BT501.
[8]
Do the following to install a new 500 CIRCUIT BOARD ASSEMBLY.
(a)
Place the new 500 CIRCUIT BOARD ASSEMBLY on the ESD MATT.
(b)
Install the CHIPS and BATTERY removed in step 7. Check for correct position.
(c)
Place the new 500 CIRCUIT BOARD ASSEMBLY on the 8 STANDOFFS. See figure 6-15.
(d)
Install the 8 SCREWS, WASHERS, and LOCK WASHERS removed in step 5.
(e)
Connect the 9 CONNECTORS.
[9]
Check the setup of the new 500 CIRCUIT BOARD ASSEMBLY.
(a)
On SWITCH S501, all positions are ''OFF''.
(b)
The JUMPERS are installed:
[10]
Close the ELECTRICAL BOX.
[11]
Install the DRYER PANEL and the RECEIVING END ACCESS PANEL.
[12]
Move the MAIN CIRCUIT BREAKER CB1 to the ''I'' position to energize the processor.
[13]
Check for the ''READY'' light.
[14]
Check for correct operation of the processor.
246616
Position
Pin
E1
1 and 2
E2
1 and 2
6-21
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