SEGA ENTERPRISES MEGA DRIVE II User manual

llU SERVICE MANUAL
GENESIS II I MEGA DRIVE II
(PAL-B/l/G, RGB)
NO. 001-2
ISSUED DECEMBER, 1993
SUPPLEMENT
{Version 1)
CONTENTS
1. DIFFERENCES BETWEEN Ver.0 AND Ver.l ·····························2
1-1. Schematic Diagram ·························································2
1-2. Diffemce Table and Parts List ············································3
2. SCHEMATIC DIAGRAM (Version 1) ··· · ···································5
3. CIRCUIT BOARD DIAGRAM (Version 1) ······························· 11
4. PARTS SPECIFICATIONS ·················································· 20
Sega Enterprises, Ltd.

~
BEFORE USING THIS SERVICE MANUAL
• This service manual includes the MEGA DRIVE II /GENESIS II Ver. 1 data.
1. DIFFERENCES BETWEEN Ver.O AND Ver.1
1-1. Schematic Diagram
Ver.a 1c2 & 3
•ro
VA •n
AO
00
VA'
9
·~
VA
;
..
01
v .
•2 02
.
VAo 0 .,
03
VA'
'
..
D<
••
DO
VA7 .
•6
06
.:
VAo
3
•7
07
v '"
,.
..
VA ..
AO
V A"
,.
AtO
VA'°
03
•11
v
A12
A .
•6
...
V A'"
...
•><n
2n
~
NuF
-Q.E.
LWR
,7
WE
u ... u•- .. - ... -15
----1 C:! P
~s
• p
NOT USED
m
Ver.a IC? & B
v
v
v
v
v .
v "
6
v 7
C1"
---
VA
'"
AO 00
V A;> 0
VA
.
••
01
v u :
•2
02
VA•
.,
03
V A6
..
D•
..
oo
v. , .
..
06
VAO 3
•7
07
VAw
AO
VA
,.
AS
V A••
AtO
VA• ;;i
,.
VA 0
AU
V• .
'"
' 412
. ..
VA,.
A1'
••~o
•o
c:E:
uw• 2 7 Q.E.
NE
UPD4ii!:a~~-1
yl
SI/01 p"tj~-~·=±:1
~i~g~ 1-:J;bs[;·~·=::t:~
SI/041 I-
AD•
'I 33P N QT us •i
Ver.1 IC2
IC2
.. v
••
101
·-
vno
..
v .,
IO•
·-~
""
v
..
I03
.
•<
v v
..
IO•
VD•
v '
..
IOO
...
IOO
v .
..
I07
..
v
A7
toe
v
..
to•
..
1010
AIO
1011
.
v
AU
tau
v
...
1013
...
101•
.,.
101!5
v
,:
-.
--
CE:..
IOUS
.... ..
~
-~
...
WIS.
i:iiiEI=
c••
L.0E/RP'"9~
·--
l..""'8323
' 3
L,~
; C<:
Ver.1 IC7
IC?
l ~~J: •• ;;:-----~e:· =m::=ta
I'- 8101 - ..
l
§~m·~E :: :i~~ !
• 4 •.•. SID• ~1i1~1~
A S1015 --.;7 •
J
~=·~~d A!S SIDS
48 8107 - ..,
6
A7 SI08
l
~=iJ1i:1::j llfl/101
W2/l02
llf31/103
l
~=i•tit:J W4/IO•
A W5/l05
'\::=~·~:tt.::j :!~i~~
LN_S_H_5_•_CO-I.-.---
1
~ 5: i
• • 1
' 1
l
c1s 1 ...... c ••
1
-'- c., 1-~ cu
* IOOP 33P SOOP
-2-

*Difference Table for Diagram - 1
CIRCUIT
GENESIS II
No.
GRID
MEGA DRIVE II
TYPE-S TYPE-F
TYPE-SM
Cl
A-I 20pF .. * 1 20pF *1 20pF * 1 NOT USED
C4 A-3 47pF
*2
47pF
*2
47pF
*2
NOT USED
C9 D-6 NOT USED NOT USED NOT USED 47pF
CIO C-5 NOT USED NOT USED NOT USED
IOpF
Cl5
i
D-1
IK
*3
IK
*3
IK
*3
NOT USED
OSCI C-5 53.693I75MHz 53.203424MHz
Notes:
*1 ·To be mounted when part No.315-5660-01 or 315-5708-01 is used for IC6.
* 2: To be mounted when part No.315-5708-01 is used for IC6.
*3: To be mounted when part No.315-5660-01 is used for IC6.
2-2. Schematic Diagram-2
I
I
I
I
IC1
r-----------1
J vcc1 vcc1
}::~~
O Q.022u
16
7
I
L------------'
IC2
r-------,
I vcc:. I
~ :
P
....,_c : ,. ul
I
I
I
L _____ ...J
IC5
r-----1
'J-~ :
Po '
u ·
!
I
I
L _____ ...J
________ JC9 ________
1
,T T::·
11
F
45
~0~~22u
"7"
9 ..
l tK
IC4
IC7
r ....... r '1
1--------,
1--------,
,..... _._._:::::. ______ 1
vc:1
' l . I
VCC1 I :
VT :
I
1 CE21 C41 I
10u 0. 0£2u
I
.__ __ _... __ ,.es,._
1
L--------__!
CN3
r----------1
I
1::T:~
:f· ;;~· • ;;~s
I A A 8
I
I
I
A3~
I
I
1 1. 20
~~~e2u I
30.40 I
CN2
P
~ :
u I
!
I
I
l _____ _J
,---------------1
I +9V VCC1 I
TP
&29
....
T~
.&ZS
B2S
.
CE2?
.
CE.28
co
47u 47u
~.022U
T•
.. ,, .,
e·
""
T~
A:Z.
e·z
I
! _______________ _..!
-----------------------------------~
'"" i
m
I
F
50
•
Im.
eo•
tOu
-~
C51
c.ozeu
l_ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ~
2 3
-7-
F
E
D
c
B
A
4

2-3. Schematic Diagram-3
F
E
D
IC11
1------1
I
vvc:c I
L:
I I
~I
J.c:m :
I ......,-.... 1oou
I :
ir l :
2~
I
I
I
I
I
l
_____ ~
CN1
r---------1
I vc:r E"> I
~
: r:" .. ~0-- :
I I
I I
! I
L. ________ J
CNS
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1
:"~ l~~ :
J7 c e ~ I
I I
L------------------------------·
L R
*Difference Table for Diagram - 4
c CIRCUIT GENESIS
II
No.
GRID MEGA DRIVE II
TYPE-S TYPE-F TYPE-SM
ICll E-6 CXA1145M MB3154PF KA2195D
MB3514PF
C29 D-7 0.01 µ F
0.01 µ F NOT
USED
0. 01 µ F
C32 E-o !80pF !5pF NOT
USED
15pF
C57
D-5
NOT USED JOOpF NOT USED
lOOpF
-·
·-·
C62
D- 7 NOT
USED NOT USED NOT USED
12pF
CE14
D-6 JOµ F 220 µ F 10 µ F 220 µ F
B
R47 E-6
l.2K 12K NOT USED
12K
R54
D-6 24K NOT USED 24K NOT USED
R55 D-6
JK
!OK NOT USED IOK
R5 7 D-7
3300HM 3300HM NOT USED IK
R61 E-5
JOK
4.7K JOK 4.7K
L2
E-7 JOOµ H JOOµ H NOT
USED
JOOµ H
L3
D-7 12 µ H J2 µ H NOT
USED
12 µ H
L6 D-7 NOT USED NOT USED NOT USED
100 µ H
A
1 2 3
8-
4

IC7 315 -0795 -80
IC MSM54C864-80JS
•Top View & Pin Layout
0
• Block Diagram
LOE /
RFSH
UOE/
TEST1
COLUMN
ADDRESS
BUFFER
LWR Dm----+--0
vcc t.; r-i- ,')
UWR
LWR
Aio
A11
A12
A14
UOEfTEST1
1 LOEIRFSH
CE
11016
11015
11014
11013
11012
11010
1109
1 Vee.::;,_;. •)
•Pin name
Pin Name Function
Ao-A14
Address input
UWR /UWR Write enable
LOE/RFSH,UOE Output enable/refresh input
CE
Chip enable input
1/01-11016
Data input/output
Vee Power supply
GND Ground
COLUMN
DECODER
MEMORY
ARRAY
REFRESH
CONTROLLER
- 21 -
1/0
SELECTOR
VBB
GENERATOR
1/0,
1102
1/03
1/04
1/05
1/06
1/0,
I/Os
1/09
1/0
10
l!0,1
1/012
1/013
1/014
11015
11016

llU
©1993 Sega Enterprises, Ltd Printed in Japan (/)
31201