Sega Mega-CD - CD-Data Read Check; Sound Check

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1.

CD-DRIVE

connection

check

(Communication)

2.

TOC

Read

check

3.

Sub-code

read

check

* CD-DATA

READ

CHECK

Check

CD

data

itself

read

by

the

CD

drive

and

data

processing.

Cause

of

Error:

the

surroundings

of

G/A

(IC2),

CNl,

the

connect

-ing

cable

between

CNl

and

the

CD

drive,

the

CD

drive

,

CD

(IC15)

etc.

1.

SUB

CPU

Read

check

2.

Main

CPU

Read

check

3.

Program

RAM

DMA

check

4.

PCM

RAM

DMA

check

5.

Word

RAM

1M

mode

DMA

check

6.

Word

RAM

2M

mode

DMA

check

*

SOUND

CHECK

Actually

replay

the

CD

sound

and

listen

to

it

with

your

ears

for

checking.

Cause

of

Error:

CN3,

the

connecting

cable

between

CN3

and

the

sub-board,

the

sub-board

etc.

1.

CD-DA

check

(Replay

of

the

14th

music

of

the

check

CD)

4