Compaq 305 specifications Infrared Problems

Presario 305 Model

Before You Begin	Specifications	Parts Catalog
Removal Sequence	Troubleshooting	Battery Operations
		Index
Product Description	Pin Assignments

Solving Minor Problems (continued)

Audio	Battery pack	Battery gauge	CD/DVD drive	Diskette/diskette
				drive
Display	Hard drive	Hardware	Keyboard	Memory
		installation
PC card	Power	Printer	TouchPad/pointing	Infrared
			device
USB	Modem

Problem

Cannot communicate with another computer

Cannot transmit data

Infrared port does not work.

System does not initiate Suspend (Standby) while infrared port is enabled.

Infrared Problems

Probable Cause	Solution(s)
The appropriate software is not running on	Install the appropriate software on the second
both computers.	computer, start the second computer, and start the
	software program on both computers.
One computer does not have an IrDA-	Communication between infrared devices must use the
compliant infrared port. Your Compaq	communications protocol. Check the manufacturer's
computer uses the IrDA communications	instructions for connecting the infrared devices or try
protocol.	connecting with a device you know to be IrDA-
	compliant.
The pathway between the infrared ports is	Remove the obstruction, align the infrared ports to
obstructed, one port is more than 30 degrees	within 30 degrees (plus or minus 15 degrees off the
(plus or minus 15 degrees off the center line)	center line), and position computers within 1.5 feet
from the other, or the ports are more than	(about 0.5 meter) of each other.
one meter apart.
There is an interrupt request (IRQ) conflict.	Check for IRQ conflicts in the Device Manager. If the
	two devices have the same IRQ address, reassign one
	of the devices.
There is a baud rate conflict.	Select the same baud rate for both computers.
There is a conflict with the # bits.	Select the same # bits setting for both computers.
There is a stop byte conflict.	Select the same stop byte for both computers.
There is a parity conflict.	Select the same parity setting for both computers.
Direct sunlight, fluorescent light, or flashing	Remove the interfering light source(s).
incandescent light is close to the infrared
connections.
There is interference from other wireless	Keep remote control devices such as wireless
devices.	headphones and other audio devices away from the
	infrared connections.
A physical obstruction is in the way.	Do not place objects that will interfere with a line-of-
	sight data transmission between the two units.
One of the units was moved during data	Do not move either unit during data transmission.
transmission.
The orientation of the units is incorrect.	Adjust the devices so that they point directly at each
	other.
The distances between the units is too great.	Verify that devices are not more than 1.5 feet (0.5
	meter) apart.
Direct sunlight, fluorescent light, or flashing	Remove the interfering light source(s).
incandescent light is close to the infrared
connection.
There is interference from other wireless	Keep remote control devices such as wireless
devices.	headphones and other audio devices away from the
	infrared connections.
IR has been disabled.	Run IR configuration utility in Control Panel.
Infrared Monitor search is enabled.	To disable Infrared Monitor search, click Start,
	Settings, Control Panel, then select the Infrared
	Options tab. Remove the check from the Search for
	and Provide Status for Devices in Range check box.

USB Problems

Problem

External device connected to a USB connector does not work.

Probable Cause

The operating system limits external devices connected by the USB to two tiers, which can include no more than two hubs on the first tier and no more than one keyboard and one pointing device on the first and second tier.

Solution(s)

Reduce the number of connected external USB devices to no more than two hubs on the first tier, and no more than one keyboard and one pointing device on the first or second tier.

External device connected to a USB connector does not work during startup (before Windows 95 loads).

During startup, only two tiers are supported by the USB port. These tiers can include no more than two hubs on the first tier and no more than one keyboard and one pointing device on the first or second tier.

Use the external device only after Windows 98 has loaded.

Reduce the number of connected external USB devices to no more than two hubs on the first tier, and no more than one keyboard and one pointing device on the first or second tier.

External devices in lower	An unpowered hub is connected to another unpowered
tiers do not work.	hub.

Use only powered hubs. Make sure that all unpowered hubs are immediately preceded by powered hubs in the USB chain.

Modem Problems

Problem Probable Cause

Modem loses connection. The cable connection from the phone line to the modem is loose.

Call Waiting has not been disabled.

Solution(s)

Check to make sure the telephone cable is properly connected.

Disable Call Waiting:

1.Select Start, Setting, Control Panel, select Modems.

2.From the General tab of the Modems Properties page, select Dialing Properties.

3.From the My Locations tab of the Dialing Properties page, check the box labeled, This location has Call Waiting. Select *70, 70#, or 1170 from the drop-down list to disable Call Waiting.

Modem not responding. Modem is not set up correctly in system BIOS.

Modem does not dial	Telephone number is not entered correctly in the dialing
correctly.	software of the modem.

Check the computer BIOS setup. If it requires specific settings for modems, be sure that they have been enabled.

●Make sure number dialed is correct if using the dialing directory or the terminal mode.

●Dial 1 if dialing long distance.

●The other line could be busy or not answering.

●Make sure the Call Waiting is disabled.

●The modem may not recognize at international dial tone. Try the ATX3DT command and the telephone number.

Characters are	There is noise in the telephone line.
garbled/transfer rates are
slow.

Phone line noise causing Hang-up Delay S Register (S10) set too low. a disconnection.

No dial tone.	Phone service is not connected to the telephone wall
	jack.

The modem is not responding to commands from the computer keyboard.

Modem does not connect	Line conditions in your area or in the area you are
at highest speed.	calling may not support the highest connect speeds.

Another device on your telephone line may be causing interference.

The service or site called does not support 56K or supports an incompatible 56K implementation.

There is noise on the telephone line.

The telephone line does not support 56K implementation.

●Check your telephone and modem cable connections. If they are a little loose, they can cause noise on the line.

●Check with your local telephone company for a phone line filter.

Change S10 default to 150. To set S10=150:

1.Select Start, Programs, Accessories, HyperTerminal, then go to Command Mode.

2.Type ATS10=150 and press Enter. This command causes the modem to take longer to disconnect even if there is noise on the line.

Verify that service from the local phone company by following these steps:

1.Unplug the telephone cable from the telephone wall jack.

2.Connect a telephone to the jack, pick up the handset, and listen for a dial tone. If there is a dial tone, reconnect the modem to the telephone wall jack with telephone cable and make sure all connections are sure.

3.If there is still no dial tone, contact your local phone company or building manager.

Verify the modem and computer are connected:

1.Select Start, Programs, Accessories, HyperTerminal, then go to Command Mode.

2.Type AT and press Enter. If the modem displays OK, the modem and computer are working together. If the modem displays ERROR, or does not respond, restart the computer and repeat step 1.

3.Type ATDT and listen for dial tone.

4.Type ATHO to hang up.

Have your telephone line checked by your local service provider.

Try dialing an alternate telephone number for the service you are using.

Hang up an extension telephone and disconnect any other devices that may be using the same telephone line, then redial.

An internal modem supports K56flex. To find an Internet service provider (ISP) that supports K56flex, go to the Compaq web site at www.Compaq.com.

The 56K protocol of an internal modem will fall back to lower speeds if the telephone line is too noisy for a high-speed connection.

Try using another telephone line.

Change the Hang-up Delay S Register:

1.Select Start, Programs, Accessories, HyperTerminal.

2.Go to Command Mode, type ATS10=150, then press Enter.

NOTE: This command causes the modem to take longer to disconnect even if there is no noise on the line.

The 56K protocol requires that the telephone line contain no more than one analog-to- digital conversion.

Try connecting from an alternate site.