Sony KV-27FS320 Safety Related Adjustments, X R530, R531 CONFIRMATION METHOD, Readjustments

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

SECTION 3: SAFETY RELATED ADJUSTMENTS

3-1. X R530, R531 CONFIRMATION METHOD

HOLD-DOWN READJUSTMENT

(HV HOLD-DOWN CONFIRMATION) AND

If the setting indicated in Step 2 of Hold-Down Operation Confirmation

READJUSTMENTS

cannot be met, readjustment should be performed by altering the

resistance value of R530, R531 component marked with X.

The following adjustments should always be performed when replacing

digital multimeter

the following components which are marked with Y on the schematic

diagram:

+

-

Part Replaced (Y)

Adjustment (X)

C531, C532, D519, D520,

HV HOLD-DOWN

D521, IC501, IC600, PH602,

R530, R531

T503

TP85

R529, R530, R531, R532,

R531 R530

FBT

R533, R550, T503 (FBT),

T504 (DFT)

PREPARATION BEFORE CONFIRMATION

ammeter

+

3mA DC range

DC Power Supply

-

A

1. Using a Variac, apply AC input voltage: 120 +/- 2.0 VAC.

+

2. Turn the POWER switch ON.

-

3. Input a white signal and set the PICTURE and BRIGHT controls to

Figure 1

maximum.

4.Confirm that the voltage of more than 23.0 VDC appears between TP85 and ground on the A Board.

		3-2. B+ VOLTAGE CONFIRMATION AND
HOLD-DOWN OPERATION CONFIRMATION			ADJUSTMENT
1.	Connect the current meter between Pin 11 of the FBT (T503) and the	Always perform the following adjustments when replacing the following
	PWB land where Pin 11 would normally attach. (See Figure 1).	components, which are marked with Y on the schematic diagram on the
2.	Input a dot signal and set PICTURE and BRIGHTNESS to minimum:	A Board:
				Adjustment (Y)
	IABL = 2175 + 100/ -325 µA.
3.	Confirm the voltage of A Board TP91 is 134.6 ± 1.0 VDC.
				A BOARD
4.	Connect the digital voltmeter and the DC power supply to TP85 and
				IC600, PH602
	ground. (See Figure 1).
5.	Increase the DC power voltage gradually until the picture blanks out.
6.	Turn DC power source off immediately.	1.	Using a Variac, apply AC input voltage: 130 + 2.0/-0.0 VAC
7.	Read the digital voltmeter indication:	2.	Input a monoscope signal.
	KV-27FS320 Only (standard = 24.78 + 0.0/ - 0.1 VDC).	3.	Set the PICTURE control and the BRIGHT control to
	All except KV-27FS320 (standard = 27.24 + 0.0/ - 0.1 VDC).		minimum.
8.	Input a white signal and set PICTURE and BRIGHTNESS to	4.	Confirm the voltage on A Board between TP23 and ground is less
	maximum: IABL = 2175 + 100/ -325 µA.		than 136.5 VDC.
9.	Repeat steps 4 to 7.	5.	If step 4 is not satisfied, replace R530 and R531 on A Board and
			repeat the above steps.

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