02 sega_32x_service_bulletins

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Service Bulletin 
Quality Assurance Division 
Me_ga Drive 1 V A4 - PAL 008 12/13/94 
SUBJECT: 
While using the MD 1 V A4 with the 32X problems like the screen shaking. game sound slows 
down and/or the game locks up. 
REASON: 
While u&ing the MD1VA4 with the 32X at room temperatw·e, it has been found that when 
certain IC's, capacitors, etc. heat up they cause the screen to shake. slow the game sound 
and cause the came to freeze. 
MODIFICATION; 
The signal shape of the EDCLK must be improved to fix this problem, see CIRCUIT 
CHANGE below. 
DETAILS: 
1. Change C92 from a o lpf capacitor to a 33pf ceramic capacitor. It is important that 
the canacitor be located next to I C4. 
2. Remove FB7 and insert ajumver wire or short out FB7. 
3. Remove C112. This is a 33pf ceramic capacitor t-hat has been added 
to the back side of the circuit board. It is connected to t.he top side of C19. 
4. Add a jumper wire to t.l1e back side of the circUit. board between the top of ClO (this 
should be the same point. electronically as IC4 pin 31) to ground (the middle pin of 
EM16 is recommended). Please be sure to use a slightly heavier gage of wire to 
!ground (heavier than AWG28 with a wit'e diameter of 0.38mm). 
Circuit Change 
EDCLK FB7 MARS 
t I 
·)><' :I:t => 1 > VDP (Short out) 
r1Jl l l. f/VV ILrul lJLtlJL 
C92/51p-} 33p C112/33p C92/33p 
Schematics I Diagrams Attached []] 
Sheetl 
Front of IC BD M5 Pal VA4 
,-----------------------------------------~ 
I 
~ :=t:::: 
IC4 
~====:r',.® 
,.. ,-- FB7 "'-
~ ar'~ 6 'ID ~ 
-----r- I 
~------~----------------------------------J 
Back of IC BD MS Pal VA4 
r--------------------------------------~--1 
I I 
.-!......- ,.-4_, ,.....-,...._.. ,....-,....._.. 
R57 I I 
I 
R56 C11 RSS J 
oe 
C88 
C18 
Back of IC BD M5 Pal VA4 
-----------------------------------------l 
I 
010 I 
I 
I I 
C80 
R1 0 I I 
::::::t: 
0 
0 Q~Re DDR1 R4 DO R5 
\ 
<b 
I 
~ 
I 
I 
liM Service Bulletin 
Quality Assurance Division 
Model# 
Genesis 32X & MD 32X 
SUBJECT: 
An SCA (Standard Cell Array) type of I C4 has replaced the gate array type originally used on 
32X. Due to this change in IC types two capacitors (C96 & C97) have been added. Please 
refer to the chart below for possible confi~rations you mav encounter. 
DETAILS: 
Value of C96 & C97 IC4 (SCA) IC4 (Gate Array) 
depends on part number C96 & C97 C96 & C97 
of IC1/IC2 
IC1 & IC2 Pt# 315-0922 47 pf NOT INSTALLED 
IC1 & IC2 Pt# 315-0922A 4 7 pf or 1 00 pf NOT INSTALLED 
IC1 & IC2 Pt# 315-0988 100 pf NOT INSTALLED 
NOTE: 
• Two 100 pf capacitors have been incorporated into the 32X VA2 version. 
• Two capacitors are added to the 32X VAON A 1 versions as per the above 
chart 
Schematics I Diagrams Attached [Kl 
Jt~b' 
Authorizing Signature 
0 
108 
. . . 0 0 . 
109 
HD5417095F23 
LO 
N 
A. • . . . en 0 Noi 
108 OSEQR64 IC2: 
. 
- "' I o 
r-. 
M 
(X). 
...:t" 
en. 
en 
.--. 
144 
. 0 . . 0 
H06417095F23 
FRONTVIE\V 
Drawing n 
0 
·7 -A~ JC1 CN1 A20 A1 CN2 
7 2 . \ 
. 
. 
. 
•• ~1 cs 1 ~ADE INJAPAN~ 
• ~ @ 7iE1 .· j vcccso @ ;{i) 
176 LD ~ \C: • • • Q • . 
• 36 
37 1 1 
... 
U -rc:Jr ; ~l6J 
32 SEliA + 
~ • • • • • • .73 
73 . . 109 
0 
....--------. 
72. . . . 
\ 0 K"S~S8l8 0 ~- . . 
0 
0 
&::. 0 
0 Drawing A . 
315-5781 
44 . ,._ ~ ~M 
= 81 37 45 • • • • • • • • NO.T usrnC52 , ... • • "tc6 • • ... ·~~ 
Mt...) 
--'. • • • • • • • 36 
Drawing A 
Insulating tape 
C97 ,Installed 
between IC21 
Pin72 and C47 
s~-::~--- Solder 
Pl IC 80 MARS MAIN v A 0 832 
Drawing B 
Ribbon cable connector 
(CN2 pin ll8) 
' '- Cut circuit pattern 
liM Service Bulletin 
Quality Assurance Division 
1\tlD 32X I ~ID 1 (VA4) 012 28 March 1995 
SUBJECT: 
Modification for lock up problem experienced w1th when 32X is used in combination with :rvrn 
1 (VA4) version. 
REASON: 
The eignal quality of the VCLK signal hae been identified as the problem area. By J~emoving 
tv:o capacitors in the VCLK signal line signal quality is greatly improved.. 
DETAILS: 
Remove C78 and C1 00. 
Also be sure to perform the MD 1 (VA4) version screen shake modification as 
this also has a positive affect on this lock up problem. 
Schematics I Diagrams Attached ~ 
~::~~<{ 
Authorizing Signature 
ClOO 
REMOVE 
Rear side (termination side) of MD1(VA4) Circuit Board. 
Service Bulletin 
Quality Assurance Division 
SUBJECT: 
Modification for. lock up problem seen with some 32X units when used in combination with 
MDl (VA6.0 ·6.5 or 6.8). 
REASON: 
The signal quality ot the VCLK signal hai been identified as the problem area. By removing 
one capacitor and adding a jumper line in the VCLK signal line,. signal quality is greatly 
improved. 
DETAILS: 
Remove C78 and add a jumper line from IC 1, pin 16 to the signal aide of the pad 
where C78 has been removed. 
Schematics I Di~gr~ms Attached [!] 
Authorizing Signature