Sun Microsystems SPARCstation 20, Service Manual

Page: 127 / 266

Chapter 8 Removing and Installing Subassemblies 103
b. Route the DC power harness through the metal cable guides.
c. Route the SCSI data cable through the metal cable guides.
d. Press the cable down between the drive bracket and the plastic card guide.
2. Connect P3 to the SCSI backplane (
FIGURE 8-39
).
3. Install the power supply.
See “Installing the Power Supply” on page 58.
4. Install the diskette drive, if it was removed earlier.
See “Installing a Diskette Drive” on page 132
5. Slide the system board completely into the chassis. Tighten the two captive screws
that secure the system board back panel to the chassis (
FIGURE 8-37
).
6. Connect the diskette data cable, SCSI data cable, DC power connector, and
speaker/LED cable to the system board (
FIGURE 8-36
).
7. Install any SBus cards.
See “Installing an SBus Card” on page 156.
8. Install the CD-ROM drive.
See “Installing a CD-ROM Drive” on page 124.
9. Detach the wrist strap and replace the cover.
See Chapter 7.”
10. Power on the system.
See “Turning On the Power” on page 47.
Removing the DC Power Harness (SunCD 4
Drive-Type Chassis)
1. Remove power from the system.
See “Removing Power from the System” on page 45.
2. Remove the cover and attach a wrist strap.
See Chapter 7.
Caution –
Use proper ESD grounding techniques when handling components. Wear
an antistatic wrist strap and use an ESD-protected mat. Store ESD-sensitive
components in antistatic bags before placing it on any surface.