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Chapter 4
Removal and
Procedures
This chapter provides procedures for removing and replacing D2246 components and
assemblies. Field-replaceable items are listed in Table 4-1.
Table 4-1 D2246 Field Replaceable Components
CO~v1PONENT/
ASSEMBLY
NEC PART NUMBER
G9QST Logic and Servo PCB
134-832954
G9QSQ Power Amplifier PCB
134-832951
G9QSN Read/Write PCB
134-832949
Earth Pad Assembly
134-232861-0
Motor Stator Assembly
806-942281-003-0
4.1 G9QST (LOGIC AND SERVO) PCB REMOVAL
Follow these steps to remove the G9QST logic and servo PCB.
1. Turn off the D2246.
2. Disconnect the dc power supply.
3. Loosen the two screws that secure the board cover to the drive unit (see Figure
4-1).
4. Lift the board cover straight up to remove it.
5. Disconnect cable connectors J55, J54, J53, and J41 (see Figure 4-2).
6. Remove the two screws that fasten the G9QST to the drive unit (see Figure 4-2).
7. Lift the G9QST PCB straight up to remove it.
When installing a new G9QST PCB, be sure that the DIP switch, jumper, and terminat-
ing resistor configurations on the replacement board match those on the old board.
4-1
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