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6.
SELF-DIAGNOSTIC CIRCUIT
LED flash
STANDBY
lamp
RY603
RELAY
4
3
1
2
Q601
V
STOP
•
15
R,G,B STOP
Q501
R510
D502
[+B overcurrent]
[+B over voltage]
[Vertical deflection stopped]
[White balance]
IC001
µ-COM
SCL1
49
D1304
SDA1
47
53
LED
62
VCR PWR
OVP
64
60
V PULSE
+B LINE
IC301
Y/C/J
R679
35
SDA
SCL
34
VM OUT
21
IK IN
IC501
Q502
7
BOOST
VCC
3
C504
C505
Owing to current increase voltage of R679 decrease and that it make Q611 and Q612 to
become LOW and OFF RY601.
When +B voltage become more than 142.5V, Q611 and Q612 pin become LOW and
RY601 OFF.
Detect Vertical deflection Pulse lost by IC001 ^º pin of micro computer.
Mute the picture at !∞ pin of IC301 that performed by Y/C/J.
Detect when R.G.B. output wrong level balance of automatic white balance detecting
standard pulse which detect cathode current, or which become low almost.
To item 2 and 5 via bus line
MEMORY
IC002
ITEM 2
Over current
Detection(OVP)
Q606
R611
Q611
Q612
D636
ITEM 2.
Over voltage
Detection(OCP)
✩ Diagnostic screen display
CRT
ITEM 4.
Auto cut-off white balance detection(AKB)
ITEM 3.
Vertical Deflection
output Detection
(V
STOP)
•
– 6 –
R656
FBT
(T801)
IC901
TELE TEXT
–
62
62
R • G • B
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