166 Chapter 6
Replacement Procedure
A20 Digital Motherboard Replacement
A20 Digital Motherboard Replacement
Tools Required
• TORX screwdriver, T10, T15, and T20
• Open-end torque wrench, 5/8 inch (set to 1.97 N-m / 17.4 lb-in)
Removal Procedure
Refer to Figure 6-16 for this procedure.
Step 1. Remove the outer cover as described in “Outer Cover Removal” on page 136.
Step 2. Remove the following assemblies.
• Front Panel (refer to “Front Panel Removal” on page 138).
• 24 Bit I/O board (refer to “A25 24 bit I/O Board Replacement” on page 150).
• Digital Bridge board (refer to “A26 Digital Bridge Board Replacement” on page 148).
• PCI DSP Card and GPIB Card (refer to “A21 PCI DSP / A24 GPIB Card Replacement”
on page 152).
• Oven ch2 assembly (refer to “Oven CH2 Assembly Replacement” on page 158).
Step 3. Disconnect all cables from the digital motherboard.
Step 4. Remove the eight TORX T10 screws (item 1) fastening the digital motherboard.
Step 5. Lift the digital motherboard slowly.
NOTE Don’t remove the CPU fan assembly and the DMM memory from digital motherboard.
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