Sony KV-32HS500 Training Manual page 35

DA-4 Temperature (Q5031), B+OCP, Vertical Deflection Protection Circuits
D-BOARD
IC2300 SYSCON
AC RELAY
69
RY6501
9V
R5104
R5105
0.7V
2
IC5007
-
+
4 5
1.6V
7.5V
R5101
R5108
9V
R5103
TH5002
(TEMPERATURE)
OF Q5031
TO M-BOARD
IC2300/PIN 44
FIGURE 4-4 - DA-4 TEMPERATURE(Q5031), B+OCP, VERTICAL
Q5031 Temperature Protection Circuit
(Reference Figure 4-4)
The temperature of the S-Correction transistor Q5031 is monitored using TH5002. If the temperature of
Q5031 should increase due to a defect, the resistance of TH5002 will decrease and the voltage at IC5007/pin 5
will decrease. Once the voltage level at IC5007/pin 5 decrease below the reference voltage level at IC5007/pin
4 (1.6V), the comparator output IC5007/pin 2 will go Low and turn Q5018 OFF.
A High through pull-up resistor R5104 is now applied to IC2801/pin 57 (H-Prot) through forward biased D5006.
IC2801 will mute the video and communicate via IC2801/pin 52 with IC2300/pin 31 to shut off the AC relay at
IC2300/pin 69.
M-BOARD
31
IO-SDAT
D5006
Q5018
0.7V
14
-
+
9 8
3V 0.23V
+135V
9V
R5013
R5014
Q5004
R5016
R5009
R5017
R5011
+
C5006 R5012
(B+ OCP)
DEFLECTION, PROTECTION CIRCUITS
B-BOARD
IC2801
52 SDA
H-PROT.
57
+135V
R8040
D8007
R8039
12V
R8038
R8024
R8037
+
C8015
R8043
Q8008
R8031 R8036
+
R8035
C8018
(FBT OCP)
+135V
D5005
R5004
R5007
33
4. DA-4 & DA-4X Protection Circuits
V-PROT.
56
R2824
Q5010
+
C5054
FROM
R8041
FBT/
PIN 1
(ABL)
Q5005
BUFFER
D5001
4.7V
R5023
3
FB PLS
IC5004
V-DRIVE
D-BOARD
V-DY (-)
FEEDBACK
CN5002/PIN 5
9V
R5164
Q5009
15V
R5019
(VERTICAL
DEFLECTION
PROTECTION)
C31P15-4-4 1519 11/12/02