Protection Circuits; Protection Circuits Overall Block Diagram - Sony KDP-51WS550 Training Manual

AX-1 Protection Circuits Overall Block Diagram
LOW B+
PROT.
5V
Q0008
6X
ZERO - DET
Q6110
Q6111
Q6112
A BOARD
9X
AUDIO PROTECT
Q2005
Q2006
Q2008
8X
HV LVP
PROTECT
IC8004
VERTICAL PROTECT
IC5101
H PROT. (IK PROT 1)
Q8008
H PROT.
CR, CG, CB
Q5202
BOARDS
WHITE BALANCE
PROTECT
Figure 4-1 is a basic block diagram illustrating the connections between the protection circuits and Main Micro,
PF Micro and Y/C Jungle ICs. Also shown on the diagram are the Standby/Timer LED flash sequences (under
each block), which will occur 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.
The important thing to note on this diagram is the protection circuits that have a direct connection to the CPU and
those that do not. The protection circuits that have a direct connection will produce a more reliable flash sequence,
e.g. 2X, 3X, 4X, 5X, 6X, 7X, 8X, 9X and 10X (as shown in the "Diagnostic Test Indicates" table in the service
manual). The circuits that do not have a direct connection (or designated flash sequence as per the service
manual) to the Main Micro or Y/C Jungle are connected in parallel with another circuit and will produce the same
flash sequence as that circuit.
Chapter 4 - AX-1 Protection Circuits
MA BOARD
IC0001
MAIN MICRO
IC0002
PF MICRO
IC0401
Y/C JUNGLE
10X
4X
7X
7X
5X
FIGURE 4-1 - AX-1 PROTECTION CIRCUITS OVERALL BLOCK
A BOARD
AC RELAY
REGULATORS
IC6801
OVP
B+ OVP
3X
HV PROTECT
IC8001
10X
H PROT.
(H. PLS)
IC8006
10X
18
4. AX-1 Protection Circuits
RY
LATCH
Q6105
A6108
B+ OCP
IK PROT.
Q8007
2X
3X
IC8002
HV POWER
SUPPLY
D BOARD
TVP16.4-1
(D)
Q6803
2X
HV
11/4/03