Read Sony KV-27S42 Service Manual online
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KV-27S42/27S46/27S66/29AL42/29AL42C/29AL66/
29AL66C/29SL42/29SL42C/29SL46/29XL42M
SECTION 4
SAFETY RELATED ADJUSTMENTS
4-1.
R584 CONFIRMATION METHOD
(HV HOLD-DOWN CONFIRMATION)
AND READJUSTMENTS
AND READJUSTMENTS
The following adjustments should always be performed when
replacing the following components which are marked with
replacing the following components which are marked with
on the schematic diagram:
DY, C508, C505, C507, C509, C511, C515, C520, C573,
C574, C575, D572, D573, D574, IC301, IC521, IC602, L591,
L501, R582, R583, R585, R578, R586, R625, R626, T504
C574, C575, D572, D573, D574, IC301, IC521, IC602, L591,
L501, R582, R583, R585, R578, R586, R625, R626, T504
Preparation Before Confirmation
1. Using a Variac, apply AC input voltage: 120 ± 2 VAC
(or 120-220 ± 2 VAC for KV-29AL42/29AL42C/29AL66/
29AL66C/29SL42/29SL42C/29SL46/29XL42M only.)
29AL66C/29SL42/29SL42C/29SL46/29XL42M only.)
2. Turn the POWER switch ON.
3. Input a white signal and set the PICTURE and
BRIGHTNESS controls to maximum.
4. Confirm that the voltage between C574 (+) or TP503
and ground is more than 105 VDC.
Hold-down Operation Confirmation
1. Connect the current meter between Pin 11 of the FBT
(T505) and the PWB land where Pin 11 would normally
attach. (See Figure 1 on the next page.)
attach. (See Figure 1 on the next page.)
2. Input a dot signal and set PICTURE and BRIGHTNESS
to minimum: IABL = 100 + 100/-95
µ
A.
3. Confirm the voltage of A Board TP-600 is 135 ± 3 VDC.
4. Connect the digital voltmeter and the DC power supply
via diode 1SS119 to C574 (+) and ground. (See Figure 1 on
the next page.)
the 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: less than or equal to 141.3 VDC).
8. Input a white signal and set PICTURE and BRIGHTNESS
to maximum.
9. Repeat steps 4 to 7.
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 R584, components marked
with
Confirmation cannot be met, readjustment should be performed
by altering the resistance value of R584, components marked
with
.
+
IABL
ABL
T504
FBT
range
-
ammeter
3.0 mA DC
A
4-2. B+ VOLTAGE CONFIRMATION AND
ADJUSTMENT
Note: The following adjustments should always be performed
when replacing the following components, which are marked
with on the schematic diagram on schematic diagram.
when replacing the following components, which are marked
with on the schematic diagram on schematic diagram.
IC601, IC602
1. Using a Variac, apply AC input voltage: 130 ± 2 VAC
(or 120-220 ± 2 for KV-29AL42/29AL42C/29AL66/
29AL66C/29SL42/29SL42C/29SL46/29XL42M only.)
29AL66C/29SL42/29SL42C/29SL46/29XL42M only.)
2. Input a dot signal.
3. Set the PICTURE and BRIGHTNESS controls to minimum.
4. Set to service adjustment mode.
5. Select PADJ with
and
.
6. Adjust with
to the 0 level.
7. Confirm that the voltage of A Board TP-600 is less than
138 VDC.
8. If step 7 is not satisfied, replace the components listed
above, then repeat the above steps.
9. Adjust with
and
for: 135+ 3 VDC
10. Write into the memory by pressing
then
.
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