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6. SELF-DIAGNOSTIC CIRCUIT
[+Bovercurrent] Owing to current increase voltage of R615 decrease and that it make PM601 pin 8 to
become LOW and OFF RY601.
[+Bovervoltage] When +B voltage become more than 142.5V, PM601 8 pin become LOW and RY601
OFF.
[Verticaldeflectionstopped] 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.
[Whitebalance] 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.
CRT
7
3
62
52
60
49
47
41
A
42
43
A
37
21
34
35
15
SCL1
SDA1
V PULSE
LED1
OVP
VCR
RY601
RELAY
Q601
ITEM 2.
Over voltage
Detection(OCP)
BOOST
VCC
IC501
IC301
Y/C/J
HP/
PROTECT
SDA
SCL
IK IN
VM OUT
R,G,B STOP
To item 2 and 5 via bus line
MEMORY
V
•
STOP
IC004
R
•
G
•
B
ITEM 5.
Auto cut-off white balance detection(AKB)
8
3
1
PM601
D1308
PM21
FBT
(T801)
C504
✩
Diagnostic screen display
Q606
R614
D502
R656
+B LINE
R615
Q502
Q501
C505
R510
IC001
µ-COM
LED flash
STANDBY
lamp
34
21
ITEM 3
Over current
Detection(OVP)
ITEM 4.
Vertical Deflection
output Detection
(V
•
STOP)
R613
R611