3–18 Disassembly and Access Procedures
Publication 1336 IMPACT-6.2 – March 1998
!
ATTENTION: Wear a wrist-type grounding strap
when servicing 1336 IMPACT drives. Failure to
protect drive components against ESD may damage
drive components. Refer to Electrostatic Discharge
Precautions at the beginning of this chapter.
Important: Before you remove connections and wires from the
drive components, mark the connections and wires to
correspond with their component connections and
terminals to prevent incorrect wiring during assembly.
1. Remove power from the drive.
2. Open the Enclosure. Refer to Opening the Drive Enclosure in this
chapter.
3. Check for zero volts at TB1 terminals +DC and –DC.
4. Check for absence of control voltage at:
• TB10
• TB11
• L Option Board (if used)
5. Remove the Main Control Board Mounting Plate. Refer to
Removing the Main Control Board Mounting Plate.
6. Remove the Gate Driver Board. Refer to Removing the Gate
Driver Board in this chapter.
7. Remove the Precharge Board. Refer to Removing the Precharge
Board in this chapter.
8. Remove the screws fastening the Snubber Board bus bar to the
Bus Capacitor Bank.
9. Remove the wires from the Snubber Board stake-on connectors.
10.Remove the 15 screws fastening the Snubber Board to the
Transistor Modules and Input Rectifier.
!
ATTENTION: The wire from TB1 terminal T3 (W)
passes through the lower LEM located on the back of
the Snubber Board. The wire from TB1 terminal T1
(U) passes through the upper LEM located on the back
of the Snubber Board. During assembly, pass these
wires through their respective LEMs to prevent damage
to the equipment.
AB Spares
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