– 7 –
KV-EF34M31/EF34M61/EF34M80/EF34M90/EF34M91
RM-951
6.
SELF-DIAGNOSTIC CIRCUIT
[+B overcurrent ªOCPº]
Occurs when an overcurrent on the +B(135) line is detected by Q604(A board). If
Q604(A board) go to ON and the voltage to pin 18 of IC301(A board) should go down
when V.SYNC is more than seven verticals in a period, the unit will automatically turn off.
[Horizontal deflection overdrive]
Occurs when an overdrive on H drive line is detected by D526(A board). Power supply
will be shut down when detect it.
[Vertical deflection stopped]
Occurs when an absence of the vertical deflection pulse is detected by Q509(A board)
and IC001(A board) shut down the power supply.
[Vertical deflection overcurrent]
Occurs when an overcurrent on V drive line is detected by Q507(A board). Power supply
will be shut down when detect this by IC001(A board).
[White balance failure]
If the RGB levels* do not balance or become low level within 5 seconds, this error will be
detected by IC301(A board). TV will stay on, but there will be no picture.
* (Refers to the RGB levels of the AKB detection Ref pulse that detects IK.)
IC301
Y/CHROMA JUNGLE
FROM
CRT
FROM
[+B]
Q604 C
[H]
D526
[V]
Q509/507
IC001
SYSTEM
IC003
MEMORY
B-DAT
IO-SDAT
IK-IN
MP/
PROTECT
IO-8DAT
O-LED
SDA
5
45
21
18
51
46
35
