Chassis, Euro-5VP - Panasonic TV Other Service Manuals (repair manual). Page 8

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8
6.  Protection
Purpose
To prevent smoke, fire and the radiation of X-rays due to
abnormally high voltages by using detection circuits (listed
below) to instantly turn off the power in the event of a
problem. Also, depending on the circuit, the projection
tubes can be damaged in the event of a problem; therefore,
there is also a circuit that informs the blanking circuit when
a problem arises so that the video signals to the cathodes
can be blanked.
There is a circuit that prevents the power being turned on by
remote control once a problem is detected.
Operation.
EURO5VP chassis has protection management IC which is
IC1103 (SOS) on A board.
Protection line of each circuit is connected to IC1103 pin
No.5-7 and 9-11.
When some of these pins go to “H”, this abnormal
information is informed to IC1101 (MPU) via IIC bus line.
Then pin No.52 of IC1101 voltage to “H”, Q1101 turns ON,
Q6751 base voltage drops to LOW and trips the RL6701.
D1111
69
70
IC1101
MPU
A2/W1
7
ETC.
6
7
9
10
11
5
D1105
D1104
75
Q1109
Q1109
+35V
Q1110
+12V
Q1108
+5V
EHT.
NECK
CONV.
+.- 15V
EHT.
IC1103
SOS
14
15
CLK
DATA
TPF51
D400/Q400
<VERTICAL>
TPF41
D500/Q503
D514/Q511
<EHT DET.>
D7560
<+22V/-22V>
52
Q7115 <R>
Q7117 <G>
Q7118 <B>
CRT STOP
D869
<+130V>
D861
<+15V/-15V>
Q1101
RL6701
P11/D4
4
Q6751
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