Apple emac ati usb2 2005 サービスマニュアル

20 -

eMac ATI Graphics/USB 2.0/2005 Troubleshooting

General Information

Display/Analog Voltage Setting and LHR Module Instructions

The display/analog (service module) contains a non-switching power supply which is preset at a 220V

configuration. The voltage selection is manually set by way of a voltage jumper. This means if you are

replacing the display/analog assembly and you will be operating the computer in a 110V environment, you

will have to install the voltage jumper on the module.

The following instructions explain how to configure the voltage and LHR jumpers on the digital/analog

assembly.

Note:

The LHR coil (a line conditioning module) is required in some international countries.

Refer to Table 1 for jumper settings and the following photos for jumper and LHR locations.

Tools

This procedure requires the following tools:

• needlenose pliers to remove/attach the voltage jumper

• phillips #2 screwdriver if attaching the LHR module

Table 1: Jumper Settings

Voltage

Environment

Voltage Jumper

Setting

LHR Jumper

Setting

110 V

Jumper is on

220 V
no LHR module

Jumper is off

Jumper is on

220 V
with LHR module

Jumper is off

Jumper is off, LHR
module installed