– 9 –
KV-HF51P50/XF21M80/XF21M83/XF21N90/XF51M65
RM-952 RM-952 RM-952 RM-915 RM-952

6. SELF-DIAGNOSTIC CIRCUIT

[+BovercurrentªOCPº] Occurs when an overcurrent on the +B(135) line is detected by Q604. If Q604 go to ON
and the voltage to pin 18 of IC301 should go down when V.SYNC is more than seven
verticals in a period, the unit will automatically turn off.
[Verticaldeflectionstopped] Occurs when an absence of the vertical deflection pulse is detected by Q509 and IC001
shut down the power supply.
[Verticaldeflectionovercurrent] Occurs when an overcurrent on V drive line is detected by Q507. Power supply will be
shut down when detect this by IC001.
[Whitebalancefailure] If the RGB levels* do not balance or become low level within 5 seconds, this error will be
detected by IC301. 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 C5
[V] Q509/507
IC001
SYSTEM IC003
MEMORY
B-DAT
IO-SDAT
IK-IN
MP/
PROTECT
IO-8DAT
O-LED
SDA
54521
18 51
4635