Da-4X Protection Circuits - Sony KV-32HS500 Training Manual

DA-4X Protection Circuits

Overall Block Diagram
M BOARD
LOW B+
(5V)
Q2314
DATA
B BOARD
IC2801
Y/C CRT DRIVE
HORIZONTAL
DEFLECTION
PROTECTION
IC8005
Q8044
(7X)
FBT/PIN 11
ABL
FROM
IC8008/PIN 10
FBT/PIN 11
ABL
FBT/PIN 6
FIGURE 4-6 - DA-4X PROTECTION CIRCUITS OVERALL BLOCK
Figure 4-6 is a basic block diagram illustrating the interconnection of the protection circuit, System control and
the AC relay. Also shown on the diagram is the Standby/Timer LED flash sequence for when the particular
protection circuit is triggered (e.g. 4X will occur with a vertical deflection failure). Each protection circuit will be
discussed in greater detail in coming diagrams. The purpose for each protection circuit is indicated by the name
of the particular block.
SYSCON
IC2300
VERTICAL
DEFLECTION
VOLTAGE
PROTECTION
PROTECTION
IC8003
IC8006
N-DY(-)
(4X)
FBT OCP &
LOW HV
PROTECTION
IC8007
(7X)
FBT OCP &
EXCESSIVE HV
PROTECTION
IC8006
(7X)
AC-RLY
G BOARD
D6523
IN RUSH
RELAY
+15V
PROTECTION
OVP
RY6702
(7X)
WHITE BALANCE
HIGH
PROTECTION
CR, CT, CG
BOARDS
(5X)
(7X)
SWITCH
Q8022
H-DRV
SWITCH
Q8021
37
4. DA-4 & DA-4X Protection Circuits
AC RELAY
RY6701
Q6503
LATCH
Q6502, Q6504
D6526 D6525
B+ OCP
B+ OVP
IC6502
IC6502
(2X) (3X)
D BOARD
H-DRV
H-DRV
BUFFER
SIGNAL
Q8041
D6527
AC-PROT.
Q528
A BOARD
10/28/02
C31P15-4-6