Section 3: Safety Related Adjustments; R530, R531 Confirmation Method (Hold-Down Confirmation) And Readjustments; B+ Voltage Confirmation And Adjustments - Sony TRINITRON KV-36FS100 Service Manual

3-1. X R530, R531 CONFIRMATION METHOD
(HOLD-DOWN CONFIRMATION) AND
READJUSTMENTS
Always perform the following adjustments when replacing the following
components marked with a Y mark on the schematic diagram:
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3-1-1. PREPARATION BEFORE
CONFIRMATION
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
maximum.
4. Confirm that the voltage of more than 23.0 VDC appears between
TP85 and ground on the A Board.
3-1-2. HOLD-DOWN OPERATION
CONFIRMATION
1. Connect the current meter between Pin 11 of the FBT (T503) and the
PWB land where Pin 11 would normally attach. (See Figure 1).
2. Input a dot signal and set PICTURE and BRIGHTNESS to minimum:
IABL = 2175 + 100/ -325 µA.
3. Confirm the voltage of A Board TP91 is 135 ± 1.5 VDC.
4. Connect the digital voltmeter and the DC power supply to TP85 and
ground. (See Figure 1)
5. Increase the DC power voltage gradually until the picture blanks out.
6. Turn DC power source off immediately.
7. Read the digital voltmeter indication (standard = 27.24 + 0.0/ - 0.1
VDC).
8. Input a white signal and set PICTURE and BRIGHTNESS to
maximum: IABL = 2175 + 100/ -325 µA.
9. Repeat steps 4 to 7.

SECTION 3: SAFETY RELATED ADJUSTMENTS

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3-1-3. HOLD-DOWN READJUSTMENT
If the setting indicated in Step 2 of Hold-Down Operation Confirmation
cannot be met, readjustment should be performed by altering the
resistance value of R530, R531 component marked with X.
R531 R530
DC Power Supply
3-2. B+ VOLTAGE CONFIRMATION AND
ADJUSTMENTS
Always perform the following adjustments when replacing the following
components, which are marked with Y on the schematic diagram on the
GK Board:
GK BOARD: IC600, PH602
1. Using a Variac, apply AC input voltage: 130 + 2.0/-0.0 VAC
2. Input a monoscope signal.
3. Set the PICTURE control and the BRIGHT control to
minimum.
4. Confirm the voltage on A Board between TP23 and ground is less
than 136.5 VDC.
5. If step 4 is not satisfied, replace R530 and R531 on A Board and
repeat the above steps.
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KV-36FS100/36FS200/38FS200
digital multimeter
+
-
T503
TP85
TP85
FBT
FBT
ammeter
3mA DC range
+
-
A
+
-
Figure 1