Compaq Presario 300 Presario 305 Series Maintenance and Service Guide - Page 68

Before You Begin Removal Sequence Product Description Presario 305 Model Specifications Troubleshooting Pin Assignments Solving Minor Problems (continued) Parts Catalog Battery Operations Index Audio Display PC card USB Battery pack Hard drive Power Modem Battery gauge Hardware installation Printer CD/DVD drive Diskette/diskette drive Keyboard Memory TouchPad/pointing device Infrared Problem Cannot communicate with another computer Cannot transmit data Infrared Problems Probable Cause Solution(s) The appropriate software is not running on both computers. Install the appropriate software on the second computer, start the second computer, and start the software program on both computers. One computer does not have an IrDAcompliant infrared port. Your Compaq computer uses the IrDA communications protocol. Communication between infrared devices must use the communications protocol. Check the manufacturer's instructions for connecting the infrared devices or try connecting with a device you know to be IrDAcompliant. The pathway between the infrared ports is obstructed, one port is more than 30 degrees (plus or minus 15 degrees off the center line) from the other, or the ports are more than one meter apart. Remove the obstruction, align the infrared ports to within 30 degrees (plus or minus 15 degrees off the center line), and position computers within 1.5 feet (about 0.5 meter) of each other. There is an interrupt request (IRQ) conflict. There is a baud rate conflict. There is a conflict with the # bits. There is a stop byte conflict. There is a parity conflict. Direct sunlight, fluorescent light, or flashing incandescent light is close to the infrared connections. There is interference from other wireless devices. A physical obstruction is in the way. Check for IRQ conflicts in the Device Manager. If the two devices have the same IRQ address, reassign one of the devices. Select the same baud rate for both computers. Select the same # bits setting for both computers. Select the same stop byte for both computers. Select the same parity setting for both computers. Remove the interfering light source(s). Keep remote control devices such as wireless headphones and other audio devices away from the infrared connections. Do not place objects that will interfere with a line-ofsight data transmission between the two units. Infrared port does not work. System does not initiate Suspend (Standby) while infrared port is enabled. One of the units was moved during data transmission. Do not move either unit during data 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 incandescent light is close to the infrared connection. Remove the interfering light source(s). There is interference from other wireless devices. Keep remote control devices such as wireless headphones and other audio devices away from the infrared connections. IR has been disabled. Infrared Monitor search is enabled. Run IR configuration utility in Control Panel. 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 Probable Cause Solution(s) External device The operating system limits external devices connected Reduce the number of connected to a USB by the USB to two tiers, which can include no more than connected external USB connector does not work. two hubs on the first tier and no more than one devices to no more than two keyboard and one pointing device on the first and hubs on the first tier, and no second tier. 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 Use the external device only port. These tiers can include no more than two hubs on after Windows 98 has loaded. the first tier and no more than one keyboard and one pointing device on the first or second tier. 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 Solution(s) Modem loses connection. The cable connection from the phone line to the modem Check to make sure the is loose. telephone cable is properly connected. Call Waiting has not been disabled. 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. Check the computer BIOS setup. If it requires specific settings for modems, be sure that they have been enabled. Modem does not dial correctly. Telephone number is not entered correctly in the dialing software of the modem. q Make sure number dialed is correct if using the dialing directory or the terminal mode. q Dial 1 if dialing long distance. q The other line could be busy or not answering. q Make sure the Call Waiting is disabled. q 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. q Check your telephone and modem cable connections. If they are a little loose, they can cause noise on the line. q Check with your local telephone company for a phone line filter. 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. 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. 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. 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-todigital conversion. Try connecting from an alternate site.