Dell 2120 service manual Diagnostics

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Diagnostics

Dell Latitude 2120 Service Manual

Device Status Lights

Battery Status Lights

Battery Charge and Health

Keyboard Status Lights

LED Error Codes

Device Status Lights

Turns on when you turn on the computer and blinks when the computer is in a power management mode.

Turns on when the computer reads or writes data.

Turns on steadily or blinks to indicate battery charge status.

Turns on when wireless networking is enabled.

Battery Status Lights

If the computer is connected to an electrical outlet, the battery light operates as follows:

•Alternately blinking amber light and blue light — An unauthenticated or unsupported non-Dell AC adapter is attached to your laptop.

•Alternately blinking amber light with steady blue light — Temporary battery failure with AC adapter present.

•Constantly blinking amber light — Fatal battery failure with AC adapter present.

•Light off — Battery in full charge mode with AC adapter present.

•Blue light on — Battery in charge mode with AC adapter present.

Battery Charge and Health

To check the battery charge, press and release the status button on the battery charge gauge to illuminate the charge-level lights. Each light represents approximately 20 percent of the total battery charge. For example, if four lights are on, the battery has 80 percent of its charge remaining. If no lights appear, the battery has no charge.

To check battery health using the charge gauge, press and hold the status button on the battery charge gauge for at least three seconds. If no lights appear, the battery is in good condition and more than 80 percent of its original charge capacity remains. Each light represents incremental degradation. If five lights appear, less than 60 percent of the charge capacity remains, and you should consider replacing the battery.

Keyboard Status Lights

The green lights located above the keyboard indicate the following:

Turns on when the numeric keypad is enabled.

Turns on when the Caps Lock function is enabled.

Turns on when the Scroll Lock function is enabled.

LED Error Codes

The following table shows the possible LED codes that may display in a no-Power On Self Test (POST) situation.

Appearance

ON-FLASH-FLASH

FLASH-ON-ON

Description

No SODIMMs are installed

System board error

Next Step

1.Install supported memory modules.

2.If memory is already present, reseat the module(s) one at a time in each slot.

3.Try known good memory from another computer or replace the memory.

4.Replace the system board.

1. Replace the system board.

FLASH-ON-FLASH