| A | B |
|---|
| LEDs and the status lights are useful in indicating whether | components inside the computer are on or working. |
| . Possible LEDs that could be installed are for | power, turbo, and the hard drive. |
| Sometimes the Turbo LED might be connected to a different component, such as the | SCSI adapter, where it serves as the SCSI drive activity light |
| Hard drive activity LEDs come in either | 2-pin or 4-pin plugs. |
| Most AT or older systems combine the keylock switch with the | power LED as one 5-pin plug. |
| Plug the speaker wire into the designated plug making sure that it plugs into | pins 1 and 4. |
| LEDs are polarity sensitive, and the connector may have to be | reversed if they do not light up properly |
| Ataching the appropriate power supply connector(s) to it an ATX (boards and power supply) is easy with because there is only | one connector that is also keyed to fit only one way. |
| With the older AT systems there are two separate, but physically identical power supply connectors that | must be plugged in a specific way |
| On an AT system, first locate the two large wire leads from the power supply labeled | P8 and P9 |
| On an AT system, the large 12-pin power connector on the motherboard is usually found | right behind the keyboard connector |
| On an AT system, plug the P8 and P9 wire lead connectors in | the 12-pin power connector |
| On an AT system, when plugging the power supply labeled P8 and P9 into the large 12-pin power connector on the motherboard make sure | the black wires are in the middle, right next to each other. |
| On an ATX system, there is one large | 20-pin (P1) power supply connector |
| To mount a 3.5" drive into a 5.25" bay, a | special bracket may be needed that usually comes with the new floppy drive. |
| The designation of a hard drive or CD-ROM drive as either master or slave is generally determined by | the jumper configuration |
| If the drive is jumpered (set to) "cable select" and both the system and ribbon cable support cable select then master and slave are determined by | the position on the data ribbon cable. |
| For better performance, always attach the | hard drive to the primary IDE channel as "primary master" and the CD-ROM to the second IDE channel as "secondary master |
| The two IDE drives | hard drive, and CD-ROM |
| The IDE drives' jumper settings are often printed | on top of the drive itself. |
| To set the jumpers always use | needle-nosed pliers or tweezers |
| "parking" a jumper | hanging the jumper on one pin is the same as not jumpered, that is, no circuit configuration has been selected |
| typical jumper settings on an IDE drive of 1 & 2 jumpered | Cable Select |
| typical jumper settings on an IDE drive of 3 & 4 jumpered | Dual (Slave) |
| typical jumper settings on an IDE drive of 5 & 6 jumpered | Dual (Master) |
| In a basic system that only has one hard drive, set the jumper to | master |
| Settings on an IDE drive jumper to "single" essentially tells the drive that it is | alone on that IDE channel and works the same as the master. |
| Set the CD-ROM to "Master" if it is the only drive | connected to the second IDE channel. |
| Newer hard drives can generate a lot of heat. Therefore, | keep these drives as far away from other hardware as possible. |
| Install a hard drive away from the power supply because | power supplies act like magnets and can damage data. |
| try to keep the hard drive near the front of the case because | it will benefit from the cooling effect of the air current drawn into the case through the front by the system cooling fans |
| set the CD-ROM jumper to master since it will be connected to the | secondary IDE channel |
| The floppy drive, hard drive, and CD-ROM communicate with the rest of the system using | ribbon cables. |
| The floppy drive exchanges data with the motherboard devices, including the microprocessor, via a | 34-pin flat ribbon (data) cable |
| A ribbon cable typically connects from a 34-pin male connector at the rear of the floppy drive to a | 34-pin male connector on the motherboard. |
| The cable plugs, drive connector, and floppy controller interface are all keyed, beginning | at pin-1, for proper alignment |
| Usually, a red stripe on the edge of the ribbon cable identifies | pin-1 |
| Current system BIOS versions can support up to two floppy drives on one controller via a | daisy chain cable arrangement. |
| Floppy drive cable pin-outs 10 through 16 are cross-wired between the middle drive connector and end drive connector, producing | a twist that reverses the Drive Select (DS) configuration of the drive plugged into the end connector of the ribbon cable. |
| The floppy drive cable twist consists of 7 data wires. This feature is called , | cable select |
| The feature, called cable select, automatically configures the drive on the middle connector as | Drive B and the drive on the end connector as Drive A |
| Pin-1 on most floppy data connectors is usually on the near side to | the power connector. |
| an incorrectly oriented floppy drive cable pin-1 becomes immediately apparent on power up by | the fact that the floppy drive LED light comes on immediately and stays on. |
| The two 40-pin IDE ribbon cables that go with the hard drive and CD-ROM are | wider than the floppy cable and have no twist at one end. |
| Attach the free end of the hard drive cable to IDE controller | #1, the primary IDE, on the motherboard. |
| Attach the free end of the CD-ROM cable to IDE controller | #2, the secondary IDE, on the motherboard. |
| The small cable drive connectors from the power supply provide power to the floppy, Hard Disk Drive (HDD), and the CD-ROM. The cable connectors have a | female 4-pin plug that connects to a male 4-pin connector at the rear of each drive. |
| The circuit board and the logic chips that each drive uses are designed to use the | +5v power. |
| The drive motors use the | +12v power. |
| Power Connector pin outs - pin 2 & 3 | Black wire color (Ground) |
