User's Manual
Table Of Contents
- Power Macintosh G3 Desktop
- Hot Issues
- Introduction
- Shared Logic Board
- Processor Module Vs. Card
- Power Supply Jumper
- Processor Module Jumper
- Warranty Sticker
- Power Supply Voltage Setting
- Voltage Regulator
- I/O Card
- ROM DIMM
- SDRAM DIMMs
- SGRAM Video Memory
- EIDE Bus Issue
- Master/Slave Support
- Ultra Wide SCSI Cable Routing
- DVD-ROM Disk Damage
- CD-ROM Ejection Problem
- HFS+ Formatted Drives
- Power-On Issue
- Basics
- Overview
- Data Buses
- Ultra Wide SCSI Card
- 10/100 BaseT Ethernet Card
- DVD-ROM Drive Technology
- FireWire Technology
- The Cuda Chip
- Resetting the Logic Board
- Sound
- Video Input and Output
- The DAV Connector
- Voltage Switch
- PowerPC G3 and Backside Cache
- SDRAM DIMMs
- SGRAM Video Memory
- DIMM Slots
- Peripheral Component Interconnect (PCI)
- Front View
- Rear View
- Internal Locator
- Logic Board
- Repair Strategy
- Warranty/AppleCare/ARIS
- G3 Design Information
- PowerPC Design Information
- Specifications
- Take Apart
- Top Housing
- Bezels
- Chassis Latch
- CD-ROM or DVD-ROM Drive
- Zip Drive
- Floppy Drive
- Drive Chassis
- Open/Remove Card Retainer Baffle
- Open Internal Chassis
- Hard Drive
- Drive Rails
- Power Supply
- Speaker
- Power Actuator
- Processor Module
- Battery
- PCI Cards
- Ultra Wide SCSI PCI Card
- FireWire PCI Card
- I/O Card
- Logic Board
- Rear Panel
- Bottom Chassis
- Modem Card
- Upgrades
- Troubleshooting
- Exploded View
- Screw Matrix
- Audio/Video Card Info
- Build-to-Order Info
- Hot Issues
Troubleshooting New Components Theory of Operation/Jumper Location J28 - 5
Jumper Location J28
Jumper location J28 controls which power supply the Power
Macintosh G3 logic board can accommodate. When you receive a
Power Macintosh G3 logic board from Service, you need to place
the jumper in the proper location. The power supply used in the
Power Macintosh G3 Desktop computer is different from the
power supply used in the G3 Minitower computer.
If the logic board is installed in the PM G3 Minitower, the power
supply jumper must cover the pins marked “PS”. If the logic
board is installed in the PM G3 Desktop model, this jumper must
cover the pins marked “Mac”. (Replacement logic boards should
come preset for the Desktop model.) When replacing the logic
board, be sure to check the power supply jumper setting. If this
jumper is missing or set incorrectly for the computer model, the
computer will not boot up