Sony KV-34FS120 Chroma Jungle OUT System Memory From IO-BDAT Board IK-AKBIN, From Hldwn Board

KV-27FS320/32FS120/32FS320/34FS120/36FS120/36FS320/38FS120

Self-Diagnostic Screen Display

For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be confirmed, it is possible to bring up past occurrences of failure on the screen for confirmation.

To Bring Up Screen Test

In standby mode, press buttons on the Remote Commander sequentially, in rapid succession, as shown below:

Display		Channel 5		Sound Volume -		Power ON
						Note that this differs from entering the Service Mode (Sound Volume
Self-Diagnostic Screen Display
	SELF DIAGNOSTIC
	2:	+B OCP	0
	3:	+B OVP	N/A
	4:	VSTOP	0		Numeral “0” means that no fault was detected.
	5:	AKB	1		Numeral “1” means a fault was detected one time only.
	101:	WDT	N/A

+

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Handling of Self-Diagnostic Screen Display

Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic screen during repairs. When you have completed the repairs, clear the result display to “0”.

Unless the result display is cleared to “0”, the self-diagnostic function will not be able to detect subsequent faults after completion of the repairs.

Clearing the Result Display

To clear the result display to “0”, press buttons on the Remote Commander sequentially when the diagnostic screen is displayed, as shown below:

Channel

8 ENTER

Quitting the Self-Diagnostic Screen

To quit the entire self-diagnostic screen, turn off the power switch on the Remote Commander or the main unit.

Self-Diagnostic Circuit

		M BOARD	A BOARD		M BOARD		M BOARD
		IC001	IC561		IC001		IC002
	Y/CHROMA JUNGLE		V. OUT		SYSTEM		MEMORY
FROM					IO-BDAT
C BOARD	51 IK-AKBIN
			REF 3		53		5 BDA
IC702 PIN 5				78 I-Prot
FROM	72 I-HLDWN
A BOARD					O-LED 79
IC501						DISPLAY
PIN 1

+B overcurrent (OCP)

Occurs when an overcurrent on the +B (135V) line is detected by pin 72 of IC001 (M Board). If the voltage of pin 72 of IC001 (M 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 deflection pulse is detected by pin 78 of IC001 (M Board). Power supply will shut down when waveform interval exceeds 2 seconds.

IK (AKB)

If the RGB levels* do not balance within 2 seconds after the power is turned on, this error will be detected by IC001 (M 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).

KV-27FS320/32FS120/32FS320/34FS120/36FS120/36FS320/38FS120 9