JVC AV-29V514/B Section Troubleshooting, Self Check Functions Outline, Self Check Items

SECTION 5

TROUBLESHOOTING

5.1SELF CHECK FUNCTIONS

5.1.1 OUTLINE

This model has self check functions given below. When an abnormality has been detected, the SUB POWER is turned off and POWER

LED	flashes to inform of the failure. An abnormality is detected by the signal input state of the control line connected to the
microcomputer.
5.1.2	SELF CHECK ITEMS
	Check item	Details of detection		Method of detection		State of abnormality
B1 over-current protection		An over-current on the low B1	The	main	microcomputer	When an abnormality has been
		line is detected.	detects the possible abnormality			detected, the SUB-POWER is
			at 24-msec. intervals and judges			turned	off.	While		the	SUB-
CRT neck broken protection		Operation of CRT neck
			the results in every 16 time. Of			POWER is being turned off, the
		protection circuit.
			the 16 times, if NG is detected			POWER key			on	the	remote
			more than 9 times, it is judged			control	unit	is	not	operational
			that there is an abnormality.			until the power cord is
						disconnected			and	connected
						again.

5.1.3 SELF CHECK INDICATING FUNCTION

When an abnormality has been detected at about 5 seconds after the power was turned on, the SUB POWER is turned off immediately and the POWER LED flashes.

	After about	Detection of
	5 seconds	an abnormality
Power on	Start of	Flashing LED
Port	detection
		SUB-POWER OFF

[ INDICATION BY THE POWER LED]

Item	LED flashing intervals
B1 over-current protection / CRT neck broken protection	0.3 seconds

(No.YA139)1-31