Atari SM124 User manual

A
ATARI®
Chassis
No.: MT -9
SVEN
HIGH
-RESOLUTION
MONOCHROME
MONITOR
CONTENTS
SAFETY
PRECAUTIONS
2
SPECIFICATIONS
3
ADJUSTMENT AND
MAINTENANCE 3'
THEORY OF
OPERATION
5
BLOCK
DIAGRAM
8
TIMING
CHART
9
TRANSISTOR & IC
BASING 10
VOLTAGE
CHART
11
COMPONENT OF P.C.B
13
TROUBLESHOOTING
CHART
16
REPLACEMENT
PARTS
LIST
26
EXPLODED
VIEW ..
29
SCHEMATIC DIAGRAM
30
SERVICE
MANUAL
Printed in Korea
P/N
483-303A

missing page 2

SPECIFICATIONS
1. CATHODE
RAY
TUBE
Type: Non
-glare
DARK
Size &
Deflection
angle: 12", 90°
Neck
diameter: 20 mm
Phosphor: Paper
White
2. INPUT
Input signal:
TTL
Signal
•
Video :
1 Vp-p
Positive
•
Audio
: 1
Vp-p
•
Vertical Drive
: 5 ±
1.5 Vp-p
Negative
•
Horizontal
Drive : 5 ±
1.5 Vp-p
Negative
Power Input : AC
220V 50Hz, 0.26A
Input
Connector :
13 Pin
Din Connector
3.
SCANNING
Horizontal
frequency :
35.7 KHz
Horizontal
retrace
time : 6.3
uS
Vertical
frequency:
71.2
Hz
Vertical
retrace
time :
420 uS
4.
VIDEO
•
Display
Area
(HXV) : 210
mm
X 130
mm
•
Amplifier
Type :
Linear
•
Frequency
band
width :
32
MHz
•
Horizontal
resolution :
1100
lines
at
center
•
Display
character :
80 X
50
characters
5.
GEOMETRIC
DISTORTION:
2.5%
max.
6.
LINEARITY
•
Horizontal
:
10%
max.
•
Vertical :
10%
max.
7.
EXTERNAL
CONTROLS:
BRIGHTNESS,
CONTRAST,
ON/VOLUME
ADJUSTMENT AND
MAINTENANCE
CIRCUIT
PROTECTION
Circuit
protection is
provided
by one
Mini fuse,
on the
power
Pc
board. A
0.5
Ampere
fuse
(F901)
is
wired
into one
side
of
the
AC line and
provides
primary
protection
to the
entire
chassis.
1.
CENTERING
ADJUSTMENT
CAUTION: The
following
adjustment points are
close to
the
high voltage
yoke
terminal. If the
raster is
not centered
in the raster
opening, it may be
centered by
removing the cabinet
back and ad-
justing the
centering tabs on the
neck of the
tube,
located at the
rear of the deflection
yoke.
Turn
the whole
device clockwise or
counter-
clockwise.
To increase
the amount
of raster
shift,
move the two
tabs which
project from
the device,
farther apart. If
the raster is
tilted
on an angle,
it may be
straightened by
loosen-
ing the
deflection yoke
locking clamp and
rotating the
deflection yoke.
2.
FOCUS'
Adjust
the fours control (VR703)
for best overall focus of the
test pattern (marked with the
symbol "%"). Usually the center
and corners of the screen do
not focus at the same setting and
a compromise must be
made.
3.
BRIGHTNESS
Adjust
subbrightness control (VR301) for visual
cut off of the
raster when
external brightness is turned to
maximum.
4. VERTICAL
SIZE AND LINEARITY
ADJUSTMENT
The vertical size
control (VR602) should
be adjusted for the
picture to fill the screen vertically, the
linearity control
(VR603) should be adjusted for best
overall vertical lineari-
ty.
Adjustment of either control will not affect the adjustment
of the
other.
5. HORIZONTAL SIZE AND LINEARITY
ADJUSTMENT
The horizontal size control (L702) is located on
the main PCB,
it should be adjusted for
the picture to fill the screen horizon-
tally,
the linearity control
(L703) should be adjusted for the
best overall horizontal
linearity adjustment so
neither con-
trol will affect the adjustment of
the other.
- 3 -

PINCUSHION AND
BARRELLING
b
a.a': 1.5
mm
max.
b.b':
1.5 mm
max.
fa'
v
a
I
a
-a':
3.0
mm
max.
a'
a
-b:
2.0
mm
max.
d
TRAPEZOID
1
i
1
/
1
i
1
c.c':
1.5 mm max.
—
____04
d.d': 1.5 mm max.
1
1 1
1
1...
I
I
d '
4--
t
---------
b-b':
2.0
mm
max.
---------------------
PARALLELOGRAM
YORK
TILT
Active video
CRT
Fig. 2,
Geometry
Measurements
c -d: 2.0 mm
max.
T =
1°
max.
b '
—
4
—

missing page 5

missing page 6

missing page 7

(
SOUND
INPUT
VERT.
SOUND
AMP.
TDA1170D
SOUND
S.P
MAIN
SYNC.
71.2Hz
VIDEO
INPUT
VERT.
OSC.
VERT.
AMP.
VERT.
OUTPUT
12V
GND
12V
GND
12V
REGULATOR
HOR.
SYNC.
35.7KHz
VIDEO
AMP.
CONTRAST
BRIGHTNESS
MONO
STABLE
CIRCUIT
VIDEO
OUTPUT
V.Dy
ASTABLE
CIRCUIT
HORIZ.
DRIVE
CRT
H.DY
HORIZ.
OUTPUT
AC
220V
50Hz
12KV
F.B.T
1
00
rs
0
CI)

H.SYNC
25pS
VIDEO
BLANK
V.SYNC
VIDEO
BLANK
1 11
35pS 0.1.--20pS
0.5pS-01
-3.5pS
-01
14.0845mS
1.50S —H
1
.41-1Lines-•-.4
(0.0281mS)
(0.9558mS)
H
34
Lines
500
Lines
(14.056mS)
(O.506mS)
(0.84338mS)
30 e l
(1.855mS)
400
Lines He— —66
(11.245mS)

TIMING
CHART
HORIZONTAL
TIMING
VIDEO
10.5uS
0.4
6uS
40uS
SYNC.
1
uS
5uS
7uS
4.5uS
15.75KHz
(63.5uS)
VERTICAL TIMING
VIDEO
1.396mS
ill
1.1134mS
12.7mS 1.41mS
0.19mS
SYNC.
0.19mS
---04 4
1.016mS
60Hz
(16.69mS)
108
*
NOTES
1. SIGNAL
INPUT LEVEL:
1Vp-p
2.
TIME TOLERANCE:
*0.1%
3. THE
MONITOR IS ADJUSTED ACCORDING TO THE ABOVE TIMINGS
AND FREQUENCY.
- 10 -

missing page 11

missing page 12

COMPONENT
OF
P.C.B
10
V4
i4• 57
07/1:
yr
-
CAI
c71,
-
R724
• R7Z7
.4?
VR/03
FOCUS
_R305
th
• •
mo o!
._•
SU6
MGM
-
kMIZKV ,
7,;,MtrirsTr .,
CONTRAST
RIM-
-
VOW
•
VitiO3
MAIN
P.C.B
(COMPONENT
SIDE)
1: 1 :A
'1'7?

MAIN P.C.B
(SOLDER
SIDE)
- 14 -

missing page 15

TROUBLESHOOTING
CHART
MAIN
CHART
,.I
Please Check the
Monitor
and
the PC
how to Connect
exactly.
Go to POWER chart.
Yes
Go to
VIDEO chart.
Switch ON monitor,
then check it after 15 miuntes.
No
•
Go to SOUND chart.
Good! Please return the set to owner.

POWER
CHART
Please check
the monitor
and
outlet
connections.
No
Check AC
fuse
(F901)
Replace AC fuse.
Yes
Trouble in
D901 -D904
Yes
No
or
Weak
Check inpu
t
of IC901.
+22V DC7 Yes
Check PS & P4
of
power PCB.
Yes
•
To the
main chart.
Check
output of IC901 & PIN
#2 of connector (P901).
Replace
IC901
or Q901.
Yes
•
To the main chart.
Replace
Power
Switch.
Replace
transformer.

VIDEO CHART
Check the connection
between
Monitor and
PC.
Faulty
•
Adjust
V -Hold
(VR601)
H
-Center
(VR701)
Sub
-Bright
(VR702)
To the
main
chart
No
Check
Video circuit
Check
Hor. circuit.
Check
Vert. ircuit.
Trouble in FBT.
Check #3 of
P301
1.6Vp-p?
Yes
Check #5 or #9 of IC302
SVP - Pi
. Yes
Trouble in
Signal
Cable.
Check 48 or #6
of IC302
Check
cathode of
CRT
PCB.
Trouble in
IC301 or
Q304.
d i
Trouble in
IC302 or
Q301
Check FBT
circuit.
Ye
Trouble in CRT.
Check
Q303
and Q302.
Trouble in
Q303
or
Q302.

SOUND
CHART
Ch ck the c nne
Lion
between Mo
itor and
PC.
Power is
ON7
TYes
Check connector
(P901).
Yes
•
Check connector
(P402).
To the
Power chart.
Normal?
-1 , Yes
Trouble in connector.
(P901)
Check connector
(P401).
Yes
•
Trouble in connector.
(P402)
Trouble in 1C401
and
C403.
Trouble
in connector.
(P401)

VIDEO CIRCUIT
BRIGHT
CONTRAST
VR301 SOOE
VR302
500E
11303
27
VIDEO
INPUT
IC 301
—6- 1
MOS
C301
47/16
0302
220/10
11304'
11SX20
1 3(??
(1) . €1 1° 0
P302
R305
R304
150
240
Ft
100
301
L302
2.44
C315
0.1
©~ 0
P303
2 1
11307
4.3K
11
30
1.2K
0.301
8306
KT C 1959-0/ T
56
2304
• 220/16
C310
709
0.001
—
•
C309
NH C305
— —
0.001 22/16
i 3
R310
1K
;in
C312
C306 0.001
22/16
0.303
KT C2229
0,302
11309
BSX20
75
1C302 SNUCK
C311 —
0.001
C307
220/
16
4 R31
11
47
R302
0313
1K
0.001
1314
0.001
R312
240
••••".
L301
4 7 1 1
400 3
3W
K
50301
•
(30$
47/100
Hi
if
CR1
3101(08
31044
CI
0720
2200P SOOV
0 0
mon
non
O
0.9Vp-p
0
5Vp-p
0 3.3Vp-p
0
0
R7211
33K
I SG701
111111(111111r112211mi
28Vp-p
12.5KV
Q301
BASE
3.3V
EMITTER 2.67V
COLLECTOR 11.66V
:3.93V
:5.88V
:70.7V
: -20.8V
:600V