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Possible Causes and Solutions

Device Drivers Need to Be Updated

Contact Plextor Technical Support for device driver information.

Bad Photo CD Disc

If you can see a list of files from your Photo CD (after issuing a DIR command), but
cannot read them, or experience errors while reading them, you may have a bad Photo
CD disc. Try another Photo CD disc. If it works, you should have the defective disc
replaced.

Symptoms

Additional Symptom

Invalid Drive Specification

Error Appears upon Initial Installation

No Device Found

of the CD-ROM Drive and Device

No SCSI Interface Board Found, 

Driver Software

or No Response from SCSI 
Interface Board

No Drives in Use

Possible Causes and Solutions

Improper SCSI Device Driver Installation

Your computer needs a SCSI software device driver to link the SCSI interface board
to the CD-ROM drive. If this driver cannot be loaded properly, an error message will
normally be displayed on the screen.

Try rebooting the computer. Watch as the CONFIG.SYS file executes, and look for an
error message to appear. You can press the Control and S keys simultaneously to freeze
the display in order to read the error message (use the Control and S combination
again to continue).

If the SCSI device driver cannot be loaded properly, either a software or hardware
conflict exists. Software conflicts are generally caused by memory managers; hard-
ware conflicts by two peripherals vying for the same DOS address space. Please read
the next two paragraphs on software and hardware conflicts.

Software Conflict with Other Device Drivers

The SCSI interface board normally designates the CD-ROM driver as the first device
driver loaded by the computer. When the computer has a memory manager (e.g.,
HIMEM.SYS, 386MAX.SYS, or QEMM.SYS), in most cases the memory manager is
loaded first and the CD-ROM driver loaded directly thereafter.

CHAPTER 12 ---- Troubleshooting

12/20PLEX OPERATION MANUAL  

49

Summary of Contents for 12-20C

Page 1: ...the tray will slide shut within 2 3 seconds Note We recommend you use the Eject button to close the tray in a smooth and secure manner Closing the tray by pressing the front of the drawer by hand is n...

Page 2: ...vent them from becoming dirty or damaged 2 Lay the bare CD into the depression in the tray label side up If the drive is mounted in the horizontal position and the CD lays flat in the drive you do not...

Page 3: ...ect press the Stop Eject button once to stop AUDIO play and a second time to eject the CD While in audio CD play mode you can read a CD ROM data disc by simply removing the audio CD and inserting a da...

Page 4: ...s no impact on the volume level of the rear panel audio outputs PX 12 20PleX Internal or External PX 20TSe External CHAPTER 11 How to Play Audio CDs on Your Drive Stereo Mini Plug To Headphone Jack Au...

Page 5: ...your computer Take note of this message Then runthetest diagnostic programthatprobablyisincludedwiththedevicedrivers for your SCSI interface board Follow the instructions given in the SCSI interface...

Page 6: ...lve your problem after reviewing the relevant sections of this chapter please contact Plextor s Technical Support Department See Chapter 13 for information on how to prepare for and then make contact...

Page 7: ...e front of your drive One reason then that you might not hear sound when playing a CD ROM disc is that a soundboard is required These discs use only sound card audio not CD Audio To help you determine...

Page 8: ...has different settings for each input source including one for CD Audio Run your soundboard s mixer program and verify that the volume is turned up Bad Soundboard Audio Cable If you have verified that...

Page 9: ...ver cannot be loaded properly an error message will normally be displayed on the screen Try rebooting the computer Watch as the CONFIG SYS file executes and look for an errormessagetoappear Youcanpres...

Page 10: ...uter and ensure that the CD ROM device driver recognizes the SCSI interface board 3 Turn off the computer and reinstall each peripheral and its device drivers one at a time 4 Repeatsteps2and3untilthep...

Page 11: ...n earlier version will result in an INCORRECT DOS VERSION message A copy of MSCDEX EXE ver 2 22 is included with DOS 6 0 You can find this file in your C DOS directory If you previously had loaded MSC...

Page 12: ...on the disc s surface may prevent the drive from reading data Read Chapter 10 to learn how to clean CD ROM discs You should also review the low performance symptom discussed on page 57 Bad Connection...

Page 13: ...for any signs of distress such as kinking Ensure the red stripe side of the ribbon cable plugs into pin 1 on both the drive and the interface board Improper SCSI Bus Termination Ensure that only the...

Page 14: ...EMM386 EXE The DOS memory manager may be using the address area required by the interface board This situation does not apply to interface boards that do not use high memory addressing such as Trantor...

Page 15: ...iscs do not have computer data typing standard data commands when an audio CD is in the drive will result in an error message Defective CD ROM Disc A fingerprint contaminants or deep scratches on the...

Page 16: ...Incorrect Version of Microsoft CD ROM Extensions Version 2 00 or higher of MSCDEX is required to read a High Sierra or ISO 9660 format disc Symptom Additional Symptom Excessive Noise CDR101 Error Mess...

Page 17: ...Plextor s drives are designed to automatically switch from top speed throughput stepwise down to single speed when they encounter a defect or a scratch on your disc The drive then will continue to rea...

Page 18: ...ed from your System Folder and the ones copied from the CD ROM device driver disk If the CD ROM drive functions correctly reinstall the INITs one at a time restarting the Macintosh after each one unti...

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