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Electrical Adjustment - Sony RM-785 Service Manual

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PVM-3230
RM-785
SECTION 5
ELECTRICAL ADJUSTMENT
5-1. B BOARD ADJUSTMENT
B BOARD - Component side -
TPl5
0
TP52
0
RV450
RV451
...:Jt:lTP53
AV411
@
nOTPn
RV301 L"§os
€f:l
TP19
C)0TP18
0
I
CV410
:
TP13~
@
0
'
TPl.4
I
0
ill)(llj w
ORV455
TP51 RV4S2
€il)@lRV454
T24@RV-453
it,
CFB301
0
0 0
TP49G [!.::JiC420
TP49R TP49B
@'
HV410
IV.Level (RV301
JI
l.
Receive contained
JOO
IRE and
,et
BRIGHTNESS control
and PICTURE button to standard<
2.
Connect an oscilloscope to TPIS (Y.!N) and adjust Y.level
VR (RVJOJ) so that the voltage value of 100 [RE portion
becomes 800
±
15
mY.
!Notch (L308)]
1.
Receive a color bar signal and set BRIGHTNESS control
and PICTURE button to standard.
2.
Set the notch to "ON" with the keyboard.
3.
Connect an oscil!oscope to TP17 (notch output) and adjust
Notch VR (L308) so that 3.58 MHz component becomes
minimum.
4.
Set Notch VR to "OFF" after adjustment.
Minimize 3.58 MHz carrier component.
/
few
(14.3 MHz)
fo
(CV410JI
Note: The cyan component
portion shOuld be less
than 100 mVp-p.
J.
Receive a color bar signal and set BRIGHTNESS control
and PICTURE button to standard,
2.
Short-circuit Pins
®
and
®)
of
IC420 (TA7193P) and
connect 22 kQ resistance to Pin
@
and ground, ·
3.
Adjust the position so that the color bar disappears and the
hue change stops with CW YR (CY410).
4.
Remove jumper wire and resistor connected in step 2.
IACC, Hua (RV410, RV411)I
l,
Receive a color bar signal
2.
Set
PlC
to
MAX.
3.
Set the color and hue to standard with control keyboard and
set
new
dynamic color(D.COL) to "OFF".
4.
Short-circuit TP18 and TPl 9 and release the gamma
correction.
5.
Connect an oscilloscope
to
TP49B (blue output) and adjust
COLOR
VR
(RV410)
and
HUE VR (RV411) so that
the
wave.form is as shown in the figure.
6..
Confinn that the TP49B voltage is l.6
±
0.15 Vp-p and
remove jumper wire from
TP18
and TPl 9.
@
@
t
1.8
±
0.15V
_L ____
0 IRE
®
®
®
!Black Level (RV450, RV454, RV455)I
l.
Receive a color bar signal, and set PICTURE button to
minimum and dynamic color (D.COL) to "OFF" with the
keyboard of
control panel.
2.
Adjust the voltage of O IRE portion with red/black level VR
(RV 450) (R.BLACK ADJ)
so
that the voltage levels of
TP49R red output (ROUT) 0 IRE portion and the voltage of
blanking period become the same.
3.
Adjust the voltage of blanking period with green/black level
VR (RV454) (G.BLACK ADJ)
so
that the voltage levels of
TP49G green output (G.OUT) 0 JRE portion and the voltage
of blanking period become the same.
4.
Adjust the voltage of blanking period with blue/black level
VR (RV455) (B.BLACK ADJ) so that the voltage levels of
TP49B blue output (B.OUT) 0 IRE portion and the voltage
of blanking period become the same.
5.
Re-tum to step 2
again,
and
if
the voltage of blanking period
is not equal to that of O IRE portion, repeat from step 2 to
step
5.
o
IRE
period
TP49R
Blanking period
TP49G
I
"jljl
t--
- 39 -
PVM,3230.
RM-785
jNew Dynamic Color (RV451, RV452, RV453)I
l.
Receive a color bar signal.
2.
Set D.COWR to "ON'" and PICTURE button to minimum.
3.
Adjust respective G.DC ADJ (RV45!) and B.OC ADJ
(RV452) so that the
O IRE
portions of TP5l (G.DC), TP52
(B.OC) and TP54 (R.OC-1) become the same.
4.
Adjust R.DC ADJ (RV453) so that
DC
level of TP53
(R.OC-2) and TP54 (R.OC-1) 0 IRE portion become the
same.
ICCD (Charge Coupled Device) Comb
Fllterl
1.
Receive 2T pulse signal.
2.
Connect an oscilloscope to TP14 (Y.OUTl).
3.
Adjust PADJJ and PADJ2 in the CFB301 pack so that the
2T pulse
becomes
the clearest waveform.
_[\_
4,
Receive a color bar signal and connect an oscilloscope to
TP14 (Y.OUT!).
5.
Adjust Y ADJ! and Y ADJZ in the CFB301 pack so that the
chroma component on Y signal becomes minimum.
6.
7,
Receive a color bar signal and connect an oscilloscope to
TP13 (Y.OUT2).
Adjust CADJJ and CADJ2 in the CFB30l pack so that the
chroma component becomes minimum.
I
~
Minimize.
5-2. 01 BOARD ADJUSTMENT
D1 BOARD -- Component side-
~
RV502
H.CENT
IH.Freq (RV501
JI
1.
Set the unit in no signal input.
AV503
H.V
,ID
@
RV501
H.FREO
2.
Connect the frequency counter to Pin@of D1-4 connector.
3.
Ground Pin @ of 01-2 connector with electrolytic capacitor
(22 µF/16V).
4.
Adjust the horizontal frequency (H.FREQ) VR (RVSOI) so
that the frequency counter value become 15.75
±
0,05 kHz.
fH.Center
(RV502)i
L
Adjust horizontal centering ·vR (R\/502) so that the screen
becomes the horizontal center.
IH.V (RV503ij
l.
Connect a digital voltmeter at the junction
of Q515
base/R589 and ground.
2.
Turn RV503 so that the high tensi·on load current flows at
I. 7 mA, and set the indication of digital voltmeter to 1 V
±
O.lV.
3,
Confirm that the high tension indication ls 27.4 kV
±
0.5
kV.
40 -·
5-3. 02 BOARD ADJUSTMENT
02 BOARD - Component side -
RV2508
U.V.B
RV2502
at,
at,
tlt> RV2501
U.l.Y
ty:I'
tlJJ
'117 U.R.V
RVL~:06
@
~-
R'::.~5
RV25-0J
at.
€ll) @
R\12504
B.l.Y W RV 2 50S
B.R.Y
8 . .Y.B
©
RV2500
V.S~ZE
RV2510
C.ANGL
RV2513 ""'.
,r,,.
""RV,!511
V.CENT <:W 'tlJ1 \':'Jl' C.BOW
RV2514
at:.
at:.
RV'2.612
V.UN,G
~
tw
V.llN.8
RV2517
H.SIZE
~
"
©
'
€il)RV2016
RV2.5t&
at:.
C.C
P.C
'tll:1
RV251~ .at:. Cl't:.RV2519
P.A
ti.rJ ~
P.P
(\I.Deflection Block (RV2500, RV2512, RV2513, RV2514)1
1
Receive a monoscope slgnal. Set PICTURE button to
maximum and BRIGHTNESS button to standard.
2.
Set V.HOLD VR (vertical sync control) at the rear control
paiieI to the mechanical center within the ·synchronizing
range.
3.
Set
vertical
amplitude
YR (RV2500),
VUN.G
VR
(RY?.514), V.LIN.B VR (RV2512) so that the vertical
screen becomes optimum. Adjust vertical amplitude for 11.9
±
0.1 division.
4.
Adjust vertical centering VR (RV25 I 3) so that the screen
becomes the vertical reoteL
5.
Tum V.HOLD VR control and confirm that the screen rolts
up/down. After the confirmation, set
it
to the mechanical
center.
PVM-3230
RM-785
~~-----
H.Deflactlon Block (AV2510, RV2511, RV2515, '
RV2516, RV2517, RV2518, RV2519)
].
Receive monoscope signal and adjust with each YR.
(]) Adjust the
pin
phase wflh RV25l9. (PIN PHASE)
[ZTI] .. [ill]+[I]J
(2) Adjust pin amplification with RV2515. (PIN AMP)
OTIJ
..
[ill]+[O]
(3) Correct bow with RV251 l. (C BOW)
[UJ .. [ill]+[ill]
(4) Adjust vertical angle with RV2510. (C ANGLE)
[Ill]+[ill]+[D]
(5) Adjust upper and lower pincushions
balance with
RV25 I 6. (PIN CORRECT)
[[]]] .. [[]]+[ill]
(6) Adjust upper and lower pincushions amplification with
RV2518. (C CORRECT)
[Ifil+[O]+[Q]]
2.
Adjust horizontal amplitude VR (RV25l7) for 15.8
±
0.1
division.
-- 41 -
PVM-3230
RM-785
5-4.
H3 BOARD ADJUSTMENT
K3 BOARD - • Component side -
iH.Center (D.RGB, RV982)I
RV982
H.CENT
©l
1.
Set H.CENT VR (RV981) for user control to click position.
2.
Supply +5V
:+:
0.1 V to Pin@(SV) of H3-3 connector.
3.
Apply
a
waveform to Pin (D (H.CENT I) of H3-3 connector
as shown in Fig. I .
4.
After comparing wavefonns at
Pin
@ (H.CENT2) and
Pin
CD
of H3-3 connector. adjust SUB H.CENT VR (RV982) so
that the phase difference at 1 \/Jc (falling wavefonn) is
within
±
0. l µs.
I
~
~
4"±:0.1V
~--~
--ii-·
5
±
0.1
/1S
.1
!----,-s3.5
±,
.us----J
Fig. 1.
H.CENT1
H.CENT1
t-f
DC,1V
H.CENT2
I
~---
Within
±
0.1 µs
Fig. 2.
- 42 -

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