Safety Related Adjustment; Circuit Adjustments - Sony PVM-2530 Service Manual

SECTION 4
SAFETY RELATED ADJUSTMENT
[H~LD DOWN ADJUSTMENT(
8
R591!l
Be sure to perform the fol/ow;ng adjustment after replacing
the parts below. (Mark.ed on
C.
the schematic diagramt
C1509, IC1501, IC1503, D520, D521, 0522, D1540, 0522,
0523, R593, R594, R595, R596, R597, R598, R599,
R1350,R1518, R/519, R/520, R/521, R1522, R1523,
R1525, R1590, R1592, R1593, R/594, R1595, R/597,
R/598,
1. Tum the POWER switch ON, and receive entirely white
signals and set the PICTURE and BRIGHTNESS control
to max imam.
2 Confirm that the voltage of the TP85 is more than
8. JV DC when
the
set
is operr:1ting
normally with
120V AC supply.
3. Adjust ABL current to 1600 ± 30 µA with PICTURE
and BRIGHTNESS.
4. Confirm that there is -less than 10.50V DC where by
the raster disappears during operation of hold-down
circuit. (HOLD DOWN check point of TP85)
5. Adjust ABL current to 290 ± 5 µA with PICTURE and
BRIGHTNESS.
- 19
6. Confirm that there is less than 11.00VDCwherebythe
raster disappears during operation of hold-down circuit.
(HOLD DOWN check point of TP85)
Note: If the hold·down circuit starts opera6ng in the
above case, switch OFF the POWER of the set
immediately.
7.
If
above steps is not satisfied, select resistance value of
R597
and repeat
above steps 1
through
6.
'
'
:T604
: t
:FBT
' '
' '
' '
L.~
~~J
F Board
ammeter
3.0mA de
range
-
A BL
R/593
D Board
I
CHECKING AFTER H. VR REPLACEMENT
After replacing H. V. R * confirm that there is more than
8.70V DC on TP85. {HOLD DOWN check point)
*
This check is to be performed when H. V. R only is re-
placed, and has no relation to the H. V hold-dawn circuit
readjustment for replacement of parts marked
ditital multimeter
{:: i 'I
PVM-2530 PVM-2530
RM-739
RM-739
CHECK AFTER /C65f and R657 REPLACEMENT
1. S1Jpp/v 13D~V AC to with variable auto-transformer.
2. Input a entirely white signal.
3. Turn the CONTROL switch OFF.
Set the PICTURE and BRIGHTNESS control to maxi-
mam.
4, Confirm the voltage an digital multimeter is less than
14L5V DC (+BLINE).
5.
ff step
4 is not satisfied,
replace IC651
and
R657
repeat
above steps.
5-1.
20
SECTION 5
CIRCUIT ADJUSTMENTS
D BOARD ADJUSTMENTS
! HorizOntaJ
Position
Adjust~_e_'!.~]
1. Check
that
H
center
moves to the right and left with
horizontal position VR (R V1503J~ then adjust horizon-
tal position ta center.
] Picture Distortion Adjustment [
1. Picture distortion adjustment
Input a signal equivalent to a crosshatch signal.
• PIN PHASE (RV508}
~-..[[]]J]-[l@]
• PIN AMP /RV507)
• PIN OUT (RV505)
[TIJ]J ... [ill]]-[illill
• /!.PIN (RV506)
2.. Adjust RV1505 (H.SJZE) so that H.SIZE is bes.
3. Adjust RV1503 (H.CENT) so that horizontal psitfon is
center.
- 21
···L-
~P=v'--'M=<--2_s_J_o _ _,_,P.,,_v_,_M,,_,,-'.._2_s_J_o__j
. RM-739 RM-739
f -H. FR ~9 XdJu;t;,;;n_{J
1. Input a color bar signal and short between IC1501 pins
(i)and@.
Also short B board IC401 pins@ and
IJ§l.
2 Adjust H.FREQ VR (RV1501) so that picture flow isas
shown in Figure.
3. After adjustment, rernove the connections In step
(0.
- 22 -
~-[[]-~
fo low fo correct
(fo-15.734Hz)
fa high