Toshiba TW40F80 Failure Diagnosis Procedure, Contents to be Confirmed by Customer, Self Check

13. FAILURE DIAGNOSIS PROCEDURE

Model of N5SS chassis is equipped with self diagnosis func-

tion inside for trouble shooting.

13-1. Contents to be Confirmed by Customer

Table 3-3

	Contents of self diagnosis		Display items and actual operation
A.	DISPLAY OF FAILURE INFORMATION IN NO	Power indicator lamp blinks and picture does not come.
	PICTURE (Condition of display)
1.	When power protection circuit operates;	1.	Power indicator red lamp blinks. (0.5 seconds interval)
2.	When I2C-BUS line is shorted;	2.	Power indicator red lamp blinks. (1 seconds interval)
		If these indication appears, repairing work is required.

13-2. Contents to be Confirmed in Service Work (Check in self diagnosis mode)

	Table 3-4
Contents of self diagnosis		Display items and actual operation
Contents of self diagnosis		Display items and actual operation
< Countermeasure in case that phonomenon always arises >
B. Detection of shortage in BUS line.		(Example of screen display)
C. Check of comunication status in BUS line.			SELF CHECK
		NO. 239XXXX	Part coce of QA01	E
D. Check of signal line by sync signal detection.		POWER: 000000	Number of operation of	F
E. Indication of part code of microcomputer (QA01).			power protection circuit
		BUS LINE: OK	Short check of bus line	B
F. Number of operation of power protection circuit.
		BUS CONT: OK	Communication check of	C
			busline
		BLOCK: UV	V1 V2	D
			QV01, QV01S

13-3. Executing Self Diagnosis Function

[CAUTION]

(1)When executing block diagnosis, get the desired input mode (U/V BS VIDEO1, 2, 3) screen, and then enter the self diagnosis mode.

(2)When diagnos other input mode, do again diagnosis operation.

13-3-1. Procedure

(1)Set to service mode.

(2)Pressing “9” key on remote unit displays self diagno- sis result on screen.

Every pressing changes mode as below.

SERVICE mode

(3)To exit from service mode, turn power off.

28