Sanyo C21PM86Z Manual de usuario

IFILE NO. I

SERVICE MANUAL Colour Television Model No. C21 PM86Z

(New Zealand)

Service Ref. No. C21 PM86Z- 00

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WI \-#

Specifications

Power Source. c...............,,. AC220- 240Volts, 50/60Hz.

Colour &Television

System ....................PAL-WG

(Av input: PAIJNTSC/NTSC4,43/pAL- 6oHz)

Channel Coverage .............VHF: 1-11

UHF: 21-69

Video IF............................. 38.9 MHz

Sound IF............................ 33.4MHz

Aerial Input Impedance, ..... 75 ~

.Ext. Terminals., .................. Video inputs (Phono jack x1)

Audio inputs (Phono jack x1)

Video outputs (Phono jack x1)

Audio outputs (Phono jack x1)

Sound Output (music) ........ 3.5W

Dimensions ........................ 509(W)x477(H)x486( D)mm

Weight ...............................aPProx. 21.5Kg

Specificationssubjecttochange withoutnotice.

Product Code: 111334618

Original Version

Chassis Series: A7- A

Give complete “SERVICE REF. No.” for parts

order or servicing. It is shown on the rating plate

at the cabinet back of the unit.

This T.V. receiver will not work properly in

foreign countries where the television trans -

mission system and power source differ from the

design specifications, Refer to the specification

table,

E8VY REFERENCE NO. SM 520236

Block Diagram

Note: This block diagram shown is for

full-featured models, other models may

not use the circuits shown. .-.

r-------- -------- -------- .- 1

1Km

tw0

u1-

L. ... -------- -- .---- ml I

-h

._.-’

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rU:ZJ<Q”E

..............

:,. ..........

:. 8:;.....:

:&jE:

:~> : : --------’ :

............. :

-1

‘-”-”””””-”

..... . .. ..

@:O:i:o” ;

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,-, -

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11- 1I

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aKa

–2–

Block Diagram

............................................

B-&

4S1

(D106)

1----.?

T,,

L....-!

NTSC

Band Limited

---i

SIF

:101(TDA8361

Fin Vin

TvOut

SECAM

REF

HFin

CHROMAID

TVID,

(TIMEBASE;

34 35

(QI 56)

,-----

6.OMHZFilter ~%

Slo

(Q155)

------

5.5MHz Filter +%

(Q154)

,-----,

4.5MHz Filter

—b%-

Filter S8

(QI 53)

+........... S* 5.5MHz Trap

!(D120)

l-c; ‘,

4.5MHz Trap

S3 Sound Cam.er Trap (

D121) 5.5/6.O/6.5MHzTrap t-

IC280

SECAM S5

1REF. “iI&.

......

~(Q2%) ;

i’ ............

................................................

IC701 (CPU)

20 SECAM1

CID. SECAM:

$TVID. 4.5

5.5

6.0

--f-~ 4.43 6.5

.-4? 3.58

50/60 ID.

14 :

....

..................

..............

.........

37j:

....

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:::

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I,::

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:, ;:

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)

_V -SYNC. Pulse

(forO.S.D.)

–3–

Circuit Description

1.POWER SUPPLY

The power supply circuit of the A7 -Achassis is

composed of arectifier smoothing circuit, an oscillation

circuit, acontrol circuit and an output rectifier circuit.

The AC input voltage is full- wave rectified by the rectifier

smoothing circuit, and an unstable DC voltage is

generated at both terminals of the smoothing capacitor

C507. This voltage is input to the oscillation circuit. The

oscillation circuit is provided with ablocking oscillator

circuit that switches the switching transistor Q513 ON and

OFF, and an oscillation frequency and a duty square

wave pulse are generated in the input windings according

to operation of the control circuit. Asquare- wave pulse

whose size is dependent on the turn ratio of the input and

output windings is obtained in the output winding. This is

rectified in the output rectifier circuit, and the desired DC

voltage is obtained.

2.IF &DEFLECTION

The IF output signal from the tuner passes through the

SAW filter, and it is input to pin45 and pin46 of IC1OI.

The signal input to the IC passes through the IF amplifier,

video detection and video amplifier circuits and is output

from pin7 as acomposite video signal.

And after this signal is converted to impedance at Q124,

supplies to the video and chroma amplifier stages passed

through the AV switching circuit of IC290.

The output signal from pin7 passes through the

5.5MHz(B/G)/6.0 MHz(l)/6.5MHz(D/K)/4 .5MHz(M) filtering

circuit, and it is input to pin5 of ICI 01. The signal input to

the IC passes through the SIF amplifier, FM detector,

external audio switch and audio output circuit, and it is

then output from pin50 as audio drive signal.

The sync. -separation circuit separates the video signals

applied to pinl 3or pinl 5to vertical- and horizontal-sync.

signals respectively.

The horizontal oscillator requires no external components

and is fully integrated. The oscillator is always running

when the start- pin36 is supplied with 8V.

Horizontal drive signal is output from pin37. VR401 is for

adjustment of the horizontal centering,

The separated vertical sync. signal from sync. separation

circuit passes through the vertical -separation circuit, and

applied to trigger divider circuit.

The horizontal oscillation pulse and input vertical sync.

pulse are monitored by the trigger divider circuit, and

switching 50Hz and 60Hz system, the vertical amplitude

automatically adjusted for 50Hz and 60Hz.

The output signal from the trigger divider is triggered

vertical oscillation circuit consisting of R401 ,C402 and

pin42, and vertical drive pulse is output from pin43.

VR451 is for changing the amount of AC feedback applied

to pin41 and for adjustment of the vertical amplitude.

3.VIDEO CHROMA %.

The composite video signal output from the pin7 of IC101

passes through Q122/ Q1 24, and it is supplied to pinl 3.

The external video signal output from SCART or other AV

terminal passes through IC290, and it is supplied to pinl 5.

The video signal input to pin13 or pin15 is separated to

luminance (Y) signal and chroma signal in IC101. These

pins are used in common with H/V -sync. separation

input.

The peaking of Ysignal is adjusted by DC voltage of

pin14.(’’SHARPNESS control)

The chroma signal is divided into R-Y, B-Ychroma

signals, demodulated in IC101,

and output from pin30 (R -Y) and pin31 (B- Y). These “

chroma signals pass through the 1Hdelay line circuit

(IC270), and they are input to pin29 (R- Y) and pin28 (B-

Y). These R- Y/B- Ysignals pass through RGB matrix

circuit and RGB selector circuit of IC101. The internal

RGB signals are generated in RGB matrix circuit and the “

RGB selector, consisting linear amplifiers, clamps and

selects either the internal RGB signals or the external

RGB signals input from pin22 (R) ,pin23 (G), pin24 (B).

Selection is controlled by the voltage at the RGB switch

control (pin21 )and mixed RGB modes are possible since

RGB switching is fast.

The RGB switch also functions as afast blanking pin by

blanking the RGB output stages; here internal and

external RGB signals are overruled.

The colour gain is controlled by DC voltage of pin26.

(“COLOUR” control)

The contrast control voltage present at pin25, controls the

RGB signal gain, and the brightness control voltage

present at pinl 7controls DC level of RGB signals.

The RGB signals are finally buffered before being

available at the RGB output pins [pin20 (R), pin19 (G),

pin18 (B)]. -/

4.AUDIO OUTPUT

The audio signal output from pin50 of ICI 01 is input to

pin2ofIC171 and passes through the pre -amplifier circuit

and drive circuit, after which

amplifier. The audio amplifier is

Push Pull) type and output to

speaker.

it is input to the audio

an SEPP (Single- Ended

pin8 to directly drive the

–4–

Circuit Description

L5.VERTICAL OUTPUT

An IC (W7832) is used for the vertical output circuit in this

chassis. The vertical drive pulse from pin43 of ICI 01 is

input to pin4 of IC451. This pulse drives IC451, and

vertical scanning is performed. In the first half of scanning

adeflecting current is output from pin2 and passes

through the following path:

VCC(B4) +D451 +pin3 +pin2 +DY =+ C461 +

VR451 IR459.

An electric charge is then stored in C461. In the last half of

scanning the current path is:

C461 +DY+ pin2+ pinl +VR451/R459 +C461

In this way, an amplifying sawtooth waveform current

flows directly to DY to perform electron beam deflection.

LNext, in the first half of the blanking period the vertical

drive pulse suddenly becomes OFF, and in order to

reduce the current flowing to DY, the current path

becomes as follows by the inductance of DY:

DY +pin2 +pinl +VR451/R459 +C461 +DY

Also, when the charge of DY has dissipated, the current

path becomes:

Vcc+ pin6+ pin7+ C452+ pin3+ pin2+ DY+ C461 +

VR4511R459

and when the prescribed current value is reached, the

vertical drive pulse becomes ON. This completes one

cycle.

6.HORIZONTAL OUTPUT

LAhorizontal oscillation signal is output from pin37 of

IC101 and switches the drive transistor Q431. This

switching signal is current amplified by the drive

transformer T431 and drives the output transistor Q432.

When Q432 becomes ON, an amplifyhg current flows

directly to DY through

C441 /C442 +L441 /R441 +DY +Q432- C+Q432- E

and deflection is performed in the last half of the scanning

period. Next, when Q432 becomes OFF, the charge that

had been stored in DY up to that point releases a

resonance current to the resonant capacitors C435 and

C436 and charges them. The current stored in C435 and

C436 is then flowed back to DY, and an opposite charge

is then stored in DY. This opposite charge then switches

the dumper diode in Q432 ON, the resonance state is

completed, and an amplifying current is then flowed again

—

directly to DY through the dumper diode.

By this means, deflection in the first half of the scanning

period is performed ,and when Q432 becomes ON at the

end of the first half of the scanning period, deflection

during the last half is begun, thus completing one cycle.

7.SYSTEM SWITCHING

(For multi- standard model)

The system switches (S1 -S11 )are used for multi -

standard model.

(Refer to Block Diagram of system switching circuit)

S1:Switch for band-limiting on NTSC(3.58) mode (Dl 06)

This switch is driven by ON/OFF signal of CPU

(pin40).

S2:Switch for sound carrier trap on NTSC(3.58) mode

(Dl 20)

This switch is driven by signal of CPU (pin40) too.

S3:Switch for sound carrier trap except NTSC(3.58) mode

(D121)

This switch is driven by inverting signal of

(pin40).

S4:System switch for forced SECAM mode (Q203)

This switch is driven by ON/OFF signal of

(pin44).

CPU

S5:lnput switch for SECAM colour demodulation (IC290)

This switch is driven by ON/OFF signal of CPU

(pin41).

S6:System switch for forced 4.43 mode (Q222)

This switch is driven by ON/OFF signal of CPU

(pin43).

Note: When the colour system is set to “AUTO, both S6

and S7 will turn on.

S7:System switch for forced 3.58 mode (Q221 )

This switch is

(pin42).

S8:System switch

mode (QI 53)

This switch is

(pin40).

S9:System switch

(Q154)

This switch is

(pin39).

driven by ON/OFF

for 4.5 MHz filtering

driven by ON/OFF

for 5.5MHz filtering

driven by ON/OFF

SIO:System switch for 6.OMHZ filtering on

This switch is driven by ON/OFF

(pin38).

signal of CPU

on NTSC(3.58)

signal of CPU

on B/G mode

signal of CPU

Imode (Ql 55)

signal of CPU

S11:System switch for 6.5MHz filtering on D/K mode

(Ql 56)

This switch is driven by ON/OFF signal of CPU

(pin37).

Note: When the TV system is set to “AUTO, S8, S9, S1 O

and S11 will turn on.

–5–

Service Adjustments

FOCU!

(14”)

POWER SUPPLY ADJ. :F

MAIN UNIT .$2

&m ~

A701

RC PRE-AMP. D803 ;g ,$

PROG.

+- LEVEL

i? Ug U$ug m~ D~ B

% ‘“..-.‘---B

907,3 =

0733*

1--1

~,.91 m,,

CONVERTER

TRANS.

m rw

2I““’

POWER

TANS

R.JME ‘n’-(=l “m?‘c.

307119

-070s

..#”c

IC551 ‘m- ‘iib~,gDE

yE,~g’07’8

c) ❑TP-E

o0❑TP-F 0!?3 aolll

NORMAL~rn~SERVICE o

3* E t 0%

LgD

ORIZONTAL

E-J \-TELETE~TUNIT

WI I/\lTuNERh>

!i!E

T471

F.B.T

CHECK \

FOCUS ~gCREEN HORIZONTAL HIDTH ADJ.

‘UPPER} (LOWER)

/HIGH $OLTAGE \CENTER ADJ.

—, TP-H~~Tp. G

/GREY SCALE ADJ.

CRT UNIT

(14”) //

VR640

I‘“El n

T121

—

VR611

RED BIAS

VR621

GREEN BIAS

VR601

BLUE BIAS

VR612

RED DRIVE

VR602

BLUE DRIVE

—

ENTER ADJ.

CRT UNIT

(16’’,20’’,21 “)

~%? yEi6E

&l ‘1 I

Ill= Q621

Q601 K6P

FTP-6F

❑[

–6–

Service Adjustments

_SAFETY PRECAUTIONS :An isolation transformer should be connected in the power line between the receiver and the AC

line before any service is performed on the receiver.

X-RADIATION PRECAUTION The primary source of X-RADIATION in television receiver is the picture tube. The picture

tube is specially constructed to limit X-RADIATION emission. For continued X-RADIATION protection, the replacement tube must

be the same type as the original including suffix letter. Excessive high voltage may produce potentially hazardous X-RADIATION.

To avoid such hazards, the high voltage must be maintain within specified limit. Refer to this service manual for specific high

voltage limits. If high voltage exceeds specified limits, take necessary corrective action. Carefully follow the instructions for +B1 volt

power supply adjustment, and high voltage check to maintain the high voltage within the specified limits.

NOTE; Do not attempt this adjustment with weak signal.

(1) Tune the receiver to most clearest (or strongest) VHF

#station in your area, Set the brightness and contrast

controls to maximum. Set the colour control to minimum.

(2) Set AGC (VR1 20) control to mid- range.

(3) Turn AGC control in direction which causes snow to appear,

then in the opposite direction until the snow just disappears.

(1) Connect DC meter to R791 and the ground.

Set the +Bl adjustment control (VR551 )to mid- range.

(2) Set the brightness and contrast to normal.

Tune the receiver to an active channel and synchronized

picture.

(3) Adjust +Bl adjustment control(VR551 )for 130 *0,5 volt

DC.

(1) Receive the monochrome circular pattern.

(2) Set the brightness and contrast to normal.

(3) Adjust VR401 for optimum horizontal center position.

F@l%THO”zOn’a’cen’er

(1) Receive the monochrome circular pattern.

(2) Set the brightness and contrast to normal.

(3) Vertical cen~ering can be adjusted by switching SW451.

f!Ei13F

Vertical center

(1) Receive the monochrome circular pattern.

(2) Set the brightness and contrast to normal.

(3) Vertical size can be adjusted by using VR451.

rtical size

–7–

(1) Receive the monochrome circular pattern.

(2) Set the brightness to normal and contrast to maximum.

(3) Adjust the focus control on the F.B.T for the best focus on

the screen center,

(1) Receiver the monochrome circular pattern.

(2) Set the brightness and the contrast to normal, the colour to

minimum.

(3) Set the service switch (SW220) at the service side.

(4) Connect aoscilloscope to TP -6C(+) and TP -6F(- ).

(Probe attenuation a10:1, Sync.V- sensitivity *0.05V

Signal coupling *DC)

Using VR640, adjust “a” ----”----”-”---”- “- ~

to be OV. d“:v

(5) Set the drive volume (VR602 and VR612) at thek

mechanical center.

(6) Set the bias volume (VR601, VR621 and VR611 )to

minimum. (fully counter clockwise).

(7) Turn the screen volume on the FBT to obtain just visible

one coloured line.

(8) Adjust each bias volume (VR601 -blue, VR621 -green and

VR611 -red) alternately until adim white line produced.

(9) Set the sewice switch (SW220) at the normal side.

(1O) Adjust the drive volume (VR602 -blue and VR612 -red)

alternately to produce normal black and white picture.

(11)Check for proper grey scale tracking at all brightness

levels.

NOTE: If the grey scale adjustment is made after picturetube

replacement, check high voltage and sub -brightness

adjustment.

(1) Receive the monochrom circular pattern.

(2) Set the brightness and contrast to maximum,

(3) If the picture is too wide or narrow, cut or short the “AJ1” on

the main unit. When AJl is shorted, the horiz. width

increase. When AJl is cut, the horiz. width decrease.

Important Note: If AJl is cut, its gap must be more than

5mm to prevent sparks.

AJl

ore than 5mm

(4) Connect ahig voltage probe to anode lead of the picture

tube.

(5) The high voltage must be between20-22KV(14“ 16“),

24- 26 KV(20” 21“).

NOTE: If the picture tube is repiaced,check the high voltage.

The horiz. width adjustment affects the high voltage and

sub brightness. Therefore, recheck the sub brightness

and the high voltage.

VIF Adjustment

Item Detector Adj. Overall Waveform(PAL)

DC 15.5V R563(D592 side) R563 (D592 side)

,: IF AGC(3.5-4.5V) ICI 01- pin48 ICI 01- pin48

&BAND UHF(with Jig-A) UHF(with Jig-A)

:Output Probe Tuner-TP Tuner-TP

~Input Probe TP-F TP-F

Sweep ATT. 25 dB(TTL) 25 dB(TTL)

:Output Probe side bside b

:e Dumping Resistor not used RI 24(100 ~resister)

:Oscilloscope Sens, 100mV/DIV 100mV/DIV

Adjust P(38.9MHz) to Usin Tuner Converter Coil

Yand 101, adjust the marker

be maximum by usin9 position to be

Adjustment T121 ,P38.9 MHz)=45% *10VO

C34.47 MHz)=45~o *10%

Waveform ~>[’~?l

mo’

PROG LEVEL Main Unit HEADPHONE

Ps501

R.wu

055sa“

D%)

oIC451

oVERT.AMP.

o@n ‘:s’”

—w~w451

TP -F&

SW220

C270

HDELAY

TELETEXTUNIT

wR124

I,& @TI 21

Iclo!

W48 ‘

Input Probe

*“SC’’’”

Detector Adi.

=3100 S2Damping

Resistor

OUtDUt Probe

0.002UF Sweep

Marker

75 QGenerator

/—

05VRult

–8– Overall Waveform(PAL) Adj.

AFT Adjustment

Item AGC Voltage Alignment Resonance Frequency Adj.(rough) Resonance Frequency Adj.(fine)

DC 15.5V R563 (D592 side) R563 (D592 side) R563 (D592 side)

,5 IF AGC(3.5-4.5V) ICI 01- pin48 ICI 01- pin48 IC101 -pin48

GBAND

0UHF(with Jig-A) UHF(with Jig-A) UHF(with Jig-A)

cOutput Probe TUNER-TP TUNER-TP TUNER-TP

GInput Probe TP-F ICI 01- pin44 ICI 01- pin44

Sweep ATT. 25 dB(lTL) 25 dB(TTL) 25 dB(TTL)

Output Probe side bside bside b

cDumping Resistor R124 not used

oOscilloscope Sens. not used

.- 10OmV/div lV/DIV

*1V/DIV

eSG Output None ATT 35dB

cATT 35dB

Fix the AGC voltage when the Keep AGC voltage, and conform the Keep AGC voltage”

Adjustment overall waveform level is marker position Pis near by the Ref. Set the VIF Adjustor Sweep off and

adjusted at 1.0 Vp -p. line. pix, SG to CW output,

Using T1 21, adjust DC voltage to

be 3.6V *0.2V.

Waveform n_-~l:output

p’s& ,

mo’

PROG LEVEL Main Unit HEAOPHONE

PS501

R5U2

05!

~a ~407’5 R791

,,,,, m

VRFAI

00IC451

VERT,AMP.

—1

>‘7 -‘,,.-,

TP– EI

❑I:9

TP-FO aal

SW220 I

w;R124

I;m== @T121

C270

HOELAY

wTELETEXTUNIT /

Input Probe

‘+%---t”soscopecope

ResonanceFrequencyAdj.

=3100 S2Damping

Resistor

Output Probe

“9–

PURITY AND CONVERGENCE ADJUSTMENT

CAUTION:The Convergence and Purity adjustments have been made at the factory. Readjustment should be “

made only after picture tube or deflection yoke replacement, following the steps below:

PURITY ADJUSTMENT

1.Demagnetize the picture tube and receiver using an external

degaussing coil. When replacing picture tube or deflection

yoke, mount deflection yoke and purity -convergence

magnets assembly properly, see figures 1and 4.

2.Turn Red and Blue guns off and provide only Green raster.

Rotate Screen control to fully counterclockwise. Rotate Red

and Blue Bias controls fully counterclockwise. Slowly rotate

Green Bias control clockwise to produce Green raster.

3. Loosen the screw holding the Deflection Yoke and remove

the 3Rubber Wedges, and slide the Deflection Yoke fully

frontward,

4. Rotate and spread the Tabs of the two Purity Magnets to

center the vertical green belt in the picture screen. The Purity

Magnets are also adjusted to obtain vertical centering of the

raster.

5.Slowly slide the Deflection Yoke backward until auniform

green screen is obtained.

6.Check the purity of the red and blue screens for uniformity,

turn off other colours to check this (use bias controls).

Readjust the yoke position if necessary until all screens are

pure.

7.Adjust each Bias control and screen control to obtain white

8. Tighten the mounting screw of the Deflection Yoke. Adjust

Convergence next.

CENTER CONVERGENCE ADJUSTMENT

1. Use adot crosshatch pattern signal.

2. Turn Red and Blue guns on and turn off Green gun. Adjust

the angle between the Tabs of the Four Pole Magnet 1and

2,and superimpose the Red and Blue vertical lines in the

center area of the picture screen. Refer to figure 2.

3. Keeping the mutual angle of the Tabs of the Four Pole

Magnet turn them together to superimpose the Blue and Red

horizontal lines in the center area of the picture screen. Refer

to figure 2.

4. Turn Green gun on and adjust Six Pole Magnet 3 and 4 sthat

the Green line superimposed on the Red/Blue lines.

This is the same procedure used in steps 2 and 3.

Refer to figure 3. --

OUTER AREA CONVERGENCE ADJUSTMENT

Slightly loosen the screw holding the Deflection Yoke, Adjust

the Deflection Yoke to converge the detail in the outer area (left

side and right side) of the picture screen by orbital movement of

the front of the Yoke, then secure the Deflection Yoke in

raster. Refer to Gray Scale Adjustment. If part of the picture appropriate position by putting the wedges as illustrated,

screen is coloured, adjust the Deflection Yoke position Tighten screw holding the Deflection Yoke.

forward or backward slightly.

DEFLECTION YOKE

FOUR- POLE

MAGNET TABS

Figure- 1. PURITY AND CONVERGENCE MAGNETS

Adjust tabs angle to superimpose

blue and red vertical line

Figure- 2BLUE AND RED LINE MOVEMENT

.-.

Figure- 4. ADJUSTMENT DEFLECTION YOKE

Adjust tabs angle to superimpose

red/blue and green vertical line

Figure- 3BLUE/RED AND GREEN LINE MOVEMENT

–lo–

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