Sony KV-13FM13 Service Manual page 8

Self-Diagnostic Circuit
Y/CHROMA JUNGLE
FROM 21
CB BOARD
CN705 PIN1
A BOARD
FROM 18
IC501
PIN 3
+B overcurrent (OCP)
Occurs when an overcurrent on the +B (135V) line is detected by pin 18 of IC1301 (MB Board). If the voltage of pin 18 of IC1301 (MB Board) is less
than 1V when V.SYNC is more than seven verticals in a period, the unit will automatically turn off.
I-Prot
Occurs when an absence of the vertical deß ection pulse is detected by pin 17 of IC1001 (MB Board). Power supply will shut down when waveform
interval exceeds 2 seconds.
IK
If the RGB levels* do not balance within 2 seconds after the power is turned on, this error will be detected by IC1301 (MB Board). TV will stay
on, but there will be no picture.
*(Refers to the RGB levels of the AKB detection Ref pulse that detects 1K).
MB BOARD A BOARD
IC1301 IC502
V. OUT
IK IN
REF
HP/PROTECT
35
SDA
MB BOARD
IC1001
SYSTEM
IO-BDAT
3 17 I-PROT
O-LED
37
IO-SDAT
— 8 —
MB BOARD
IC1003
MEMORY
B-DAT
36 5
18
DISPLAY
KV-13FM13 / 13FM14