Monitor, Block Diagram Review - Ceronix 1493 Service Manual

GAME
VIDEO
3
VIDEO
Interface
RGB
SYNC
BLANKING
V. & H.
V retrace
Beam limit
M. gain
High temp. limit
SYNC
VERTICAL
Interface
SYNC
J
DELAY
2
VERTICAL
V
s
OSCILLATOR
HORIZONTAL
CONTROL
H
s
Sync delay
H. Pos.
REMOTE
CONTROLS
ISOLATION
Transformer
(IN GAME)
DEGAUSSING
CIRCUIT
Z
74

Monitor, Block Diagram Review.

On Video Board.
VIDEO
3
AMPS.
Bias
A
3
3
F.B.P.
3
CRT AUTO
I
BIAS IC
H. sync (FBP)
V. sync
CA3224E
F
LA7851
K
LA7851
M
V. Size &
V. Ras. Pos.
(PCB)
Q
+52V to +129V
VOLTAGE
DOUBLER
Raw DC
320V
T
-200V
V-
FAULT
+24V
DETECTOR
Beam
3
Current
Feedback
B
C
Auto
Bright
G
3
D
Beam current
buffer
Program pulse
Grid pulse
E
VERTICAL
CONTROL &
OUTPUT
LA7838
I. V. Feedback
H. H.
Driver
Output
N
PINCUSHION
HORIZONTAL
Size Control
R
LOAD
(VIDEO & DEFLECTION)
SWITCHING
REGULATOR
+24-27V
Sync
Shutdown
U
OVER
VOLTAGE
FBP
PROTECT
Y X
G2≈290V
G1≈–20V
3
CRT
V
DY
EHT≈25KV
H
DY
Dynamic Focus
used only on Dual
Focus CRTs
L
+
G2 EHT
FBT
O
DIODE
Modulator
S
Beam Current
V
+12V
+16V
+12V
Regulator
W
Vertical Deflection
Supply
2 For Dual Focus
H
Horizontal
Dynamic
Focus
H2
V+
Vertical
Dynamic
Focus
H1
2
P