Safety Related Adjustments - Sony KV-27V10 Service Manual

3-4. G2 (SCREEN) AND WHITE BALANCE
ADJUSTMENTS
1, G 2 (SCREEN) ADJUSTMENT (RV 702)
1. Set the PICTURE and BRIGHTNESS to normal.
2. Apply DC voltage of 170 V to the cathodes of R,G
and B from DC stabilized power source.
3. While watching the picture, adjust the G2 control
(RV 702) to the just the retrace line disappears.
2. WHITE BALANCE ADJUSTMENTS
14 | GAMP | Green Amp 20
15 | BAMP | Blue Amp v7
16 | GCUT | Green Cut-off 7
17 | BCUT | Blue Cut-off 8
22 =| SBRT | Sub Bright 35
1, Input an entire white signal.
2. Set to service adjustment mode.
3. Set the PICTURE and BRIGHT to minimum.
4. Adjust with SBRT if necessary.
5. Select G CUT and B CUT with[iJana[4].
6. Adjust with[3]and|6]for the best white balance.
7. Set the PICTURE and BRIGHT to maximum.
8. Select GAMP and BAMP with[lJand [4]
9. Adjust with[]and[6]for the best white balance.
10. Write into the memory by pressing' [MUTING]
then|ENTER}.
3. SUB BRIGHT ADJUSTMENT
1. Set to service mode.
2, Input a staircase signal of black and white from
the pattern generator.
3. BRIGHTNESS --- RESET
PICTURE «------- minimum
4. Select SBRT with [I] and [4] , and adjust SUB
BRIGHT level with [3] and [6] so that the stripe
second from the right is dimly lit.
white
second from the right
f
black
— 33 —
KV-27V10/27V15
RM-V117 RM-Y121/RM-CM101
KV-29V10C/29V10M/32V15
RM-Y117. RM-YI17 RM-Y121
RM-CM10 CM101
KV-27V10/27V15
RM-V117 RM-Y121/RM-CM101
KV-29V10C/29V10M/32V15
RM-YI17 — RM-Y117 AM-Y121
RM-CM101
SECTION 4
SAFETY RELATED ADJUSTMENTS
6&4 R511 CONFIRMATION METHOD (HOLD-DOWN
CONFIRMATION) AND READJUSTMENTS
The following adjustments should always be per-
formed when replacing the following components
(marked with [4 on the schematic diagram).
PM501, R338, R511, R632, R645, R650
®
1. Preparation before confirmation
1) Remove R635 on the D board and connect a
variable resistor (RV1: about 4.7k2-10k2 )
between pin @ of IC601 and B+ line.
2) Supply 130+2.0V AC to with variable auto-
transformer.
2. Hold-down operation confirmation
1) Turn the POWER switch ON, and receive
entirely white signals and adjust ABL current to
1760+50zA with PICTURE and BRIGHT etc
controls.
Increase B+ line voltage gradually by adjusting
the resistor of RV1. Confirm that the minimum
voltage is less than 142.5V DC (27 inch) 140.0V
DC (32 inch) whereby the raster disappears
during operation of hold-down circuit.
NOTE: When the hold-down circuit starts
operating, switch OFF the POWER of
the set immediately.
3) Turn the POWER switch ON, and receive dot
signals and adjust ABL current to 160+50pA
with PICTURE and BRIGHT etc controls.
4) Increase B+ line voltage gradually by adjusting
the resistor of RV1. Confirm that the minimum'
voltage is less than 145.0V DC (27 inch), 143.5V
DC (32 inch) whereby the raster disappears
during operation of hold-down circuit.
NOTE: When the hold-down circuit starts
operating, switch OFF the POWER of
the set immediately.
2
3. Hold-down readjustment
When step 2 is not satisfied, readjustment should
be performed by altering the resistance value of
R511 (a component marked with Ba).
Ba R524 CONFIRMATION METHOD (HOLD-DOWN
CONFIRMATION) AND READJUSTMENTS
The following adjustments should always be per-
formed when replacing the following components
(marked with [4 on the schematic diagram).
10601, PM501, D504, C598, R338, R509, R524, R632,
R635, R645, T501
1. Preparation before confirmation
1) Turn the POWER switch ON, and receive
entirely white signals and set the PICTURE and
BRIGHT controls to maximum.
2) Confirm that voltage of the check terminal of
TP-85 (D BOARD) is more than 114.0V DC (27
inch) 122.3V DC (32inch) when the set is
operating normally with 120.0+2.0V AC supply.
2. Hold-down operation confirmation
1) Turn the POWER switch ON, and receive
entirely white signals and adjust ABL current
to 1760+50zA with PICTURE and BRIGHT
etc controls .
2) Apply DC voltage of over 130.0V DC gradually
to the check terminal of TP-85 (D BOARD)
via 1T40 from the DC stabilized power source.
Confirm that the minimum voltage is less than
137.5V DC (27inch) 143.5V DC (32inch)
whereby the raster disappears during operation
of hold-down circuit.
NOTE: When the hold-down circuit starts
operating, switch OFF the POWER.
of the set immediately.
3) Turn the POWER switch ON, and receive dot
signals and adjust ABL current to 160+50pA
with PICTURE and BRIGHT etc controls .
4) Apply DC voltage of over 130.0V gradually to
the check terminal of TP-85 (D BOARD) via 1
T40 from the DC stabilized power source.
Confirm that the minimum voltage is less than
138.0V DC (27inch) 144.1V DC (32inch)
whereby the raster disappears during operation
of hold-down circuit.
NOTE: When the hold-down circuit starts
operating, switch OFF the POWER
of the set immediately.
3. Hold-down readjustment
When step 2 is not satisfied, readjustment should
be performed by altering the resistance value of
R524 (a component marked with BA).
— 34 —
B+ VOLTAGE CONFIRMATION]
The following adjustments should always be perform-
ed when replacing IC601 and R635.
1) Supply 130+%8V AC to with variable autotrans-
former.
2) Receive entirely monoscope signal.
3) Set the PICTURE control and the BRIGHT
controls in to initial reset.
4) Confirm the voltage of TP91 is less than 137.0V
DC.
5) If step 4) is not satisfied, replace 1C601 and R635
repeat above steps.
ABL
S01
FBT
digital
multimeter
regulated-de 1140
power supply
— 35 —
KV-27V10/27V15
RM-Y117 RM-Y121/RM-CM101
KV-29V10C/29V10M/32V15
RMAYS7 —RM-YI17 RM-Y121
RM-CM101
* Use a digital multimeter whose input impedance
over 100 M2 when confirming the voltage of
the protector terminal of TP85.
ammeter digital
multimeter
3mA de range
RVI
(R635)
4.7K 10KQ
C601
{J
1