Sony TRINITRON KV-21FA310 - Section 3: Safety Related Adjustments; HV Hold-Down Confirmation and Readjustments; B+ Voltage Confirmation and Adjustment

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KV-20FS120/21FM120/21FS120/21FA310/24FS120/25FS120
KV-20FS120/21FM120/21FS120/21FA310/24FS120/25FS120
Hold-Down Readjustment
If the setting indicated in Step 2 of Hold-Down Operation Confi rmation
cannot be met, readjustment should be performed by altering the
resistance value of R565 component marked with
X .
+
IABL
ABL
T585
FBT
range
-
Ammeter
3.0 mA DC
A
3-2. B+ VOLTAGE CONFIRMATION AND
ADJUSTMENT
Note: The following adjustments should always be performed when
replacing the following components, which are marked with
Y on the
schematic diagram on the A Board:
A BOARD: Y IC600, PH602
1. Using a Variac, apply AC input voltage: 130 + 2.0 / - 0.0 VAC.
2. Input a DOT pattern at Q.C.
3. Set the PICTURE and the BRIGHTNESS controls to minimum.
4. Confi rm the voltage of A Board between TP-23 & Ground is =135.6
± 1VDC.
5. If step 4 is not satisfi ed, replace the components listed above, then
repeat steps 1 through 3.
SECTION 3: SAFETY RELATED ADJUSTMENTS
3-1. X R565 CONFIRMATION METHOD
(HV HOLD-DOWN CONFIRMATION) AND
READJUSTMENTS
The following adjustments should always be performed when replacing
the following components which are marked with
Y on the schematic
diagram:
DY, T585, CRT, IC001, IC561,
IC600, C506, C507, C508, T511,
L510, C588, L588, C566, C561,
C563, D567, D568, D566, PH602,
R567, R568, R565, R566, R562,
R563, R561, R528……....A Board
HV HOLD-DOWN
RV565
Part Replaced (Y) Adjustment (X)
Preparation Before Confi rmation
1. Using a Variac, apply AC input voltage: 120 ± 2 VAC.
2. Turn the POWER switch ON.
3. Input a white signal and set the PICTURE and BRIGHTNESS
controls to maximum.
4. Confi rm that the voltage between C566 (+) or TP30 and ground
is more than 97 VDC for 20”/21” models, or 105 VDC for 24”/25”
models.
Hold-Down Operation Confi rmation
1. Connect the current meter between Pin 11 of the FBT (T585) and the
PWB land where Pin 11 would normally attach (See Figure 1 on the
next page).
2. Input a dot signal and set PICTURE and BRIGHTNESS to minimum:
IABL = 100 ± 100µA.
3. Confi rm the voltage of A Board TP-23 is 135.6 ± 1VDC.
4. Connect the digital voltmeter and the DC power supply via Diode
1SS119 to C566 (+) and ground (See Figure 1 on next page).
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 < 117.0 VDC) for 20”/21” models
(standard < 138.0 VDC) for 24”/25” models.
8. Input a white signal and set PICTURE and BRIGHTNESS to
maximum: IABL = 1350 ± 100µA for 20”/21” models or
IABL = 1650 ± 100µA for 24”/25” models
9. Repeat steps 4 through 7.