SC400 Revision 2 Troubleshooting Guide
EBT

Overview:
Possible causes of SC400 rev. 2 Audio Failures:
IRQ, DMA, ADDRESS CONFLICTS.
Poor connection between the sound card and slot 
or bad slot.
Incorrect connection of CD-ROM data cable or bad 
data cable.
Bad or Damaged sound card.
Jumper settings not at default.
Bad or Damaged speakers.

Procedure:
1: Remove all added hardware to insure there is 
   no irq,dma. or address conflict.

If the system:

-  Produces No sound but sound card is detected 
   begin with step 2.

-  Produces sound but the CD-ROM drivers are 
   not loading or cdr101 errors begin with step 
   3.

-  Does not detect the sound card begin with 
   step 4.

2. If no sound is produced:
  A: check speaker connections, if amplified 
     check power indication lights, if not 
     amplified make sure speakers are turned off, 
     try Headphones.
  B: Boot F5 or from A and run SG5 test, Run all 
     tests FM, 8bit and 16bit.
  C: Check mixer settings sg16mix alt + / to 
     activate mixer make sure all settings are 
     up if not adjust settings to max save to 
     eeprom and do a cold boot.
  D: Chkdsk /f or scandisk and delete and re-
     install software.
  E: If cmos has option for cache disable it.
  F: Check speaker amplification jumpers make 
     sure there at default.
  G: Reseat card in a different slot.

3: If produces sound but CD-ROM drivers doesn't 
   load or cdr101:

 3A. If the drivers in config.sys are not load-
     ing.
    A: Make sure they are using the correct 
       drivers boot F8 and just load the CD-ROM 
       drivers, Try a different one for ex. if 
       there using sgcdu.sys try cr56x.sys, Run 
       instatcd.

     B: Run sg16fig press N 2 times to go to the 
        3rd page, make the CD-ROM drive is 
        selected correctly Pan. or Mitsumi.

     C: Make sure there is power to the CD-ROM 
        drive, if there is reseat the data cable 
        or if possible try different 40 pin data 
        cable.
        Make sure it is plugged to the correct 
        CD-ROM interface connection.

   3B: If getting cdr101 errors.
      A: Check to see if the CD is spinning by 
         placing CD on tray; checking orientat-
         ion, closing tray waiting for light to 
         come on and go off, ejecting the tray 
         to see if it moved from the orientation 
         that you placed it in. , if not remove 
         data cable from back of CD-ROM and
         loosen mounting screws.

      B: If it spins  refer to steps 3AA, 3AB 
         also reseat data cable or try diffe-
         rent data cable.

4: If the sound card is not detected.
   A: Remove CD data cable from sound card if 
      there is one.
   B: Check jmpcfg if it is on 1-2 try it on 2-3.
   C: Try card in a different slot a couple if 
      necessary.
   D: Remove all additional cards that might 
      cause conflicts. For example: Another 
      sound card, scanner, TV card, joystick 
      card etc. 
   E: If possible try card in a different system.

Note: If eeprom settings dont save check the 
      jmpcfg jumper if on 2-3 put it on 1-2 if 
      symptom persists RMA card.

If Above procedures fail press transfer key and 
dial 2525 for RMA.

A good troubleshooting procedure is to narrow 
down isolate the problem, a process of elimina-
tion. 

*************************************************
SETTINGS OF THE MITSUMI CD ROM 
CHANNEL SELECTION JUMPER BLOCK ARE:

MTDACK           MTDRQ            SETTINGS
_________________________________________________
DAK0 CLOSED      DRQ0 CLOSED     DMA CHANNEL = 0
DAK1 OPEN        DRQ1 OPEN
DAK3 OPEN        DRQ3 OPEN
_________________________________________________

DAK0 OPEN        DRQ0 OPEN       DMA CHANNEL = 1           
DAK1 CLOSED      DRQ1 CLOSED  
DAK3 OPEN        DRQ3 OPEN
_________________________________________________

DAK0 OPEN        DRQ0 OPEN       DMA CHANNEL = 3
DAK1 OPEN        DRQ1 OPEN
DAK3 CLOSED      DRQ3 CLOSED
*************************************************