Sharp CX-6336 Service Manual

SHARP

SERVICE MANUAL

S96M8CX6336l

111 Liilwiqf~ffU

PAL SYSTEM

COLOUR TELEVISION

f

l ELECTRICAL SPECIFICATIONS
l IMPORTANT SERVICE NOTES
l SERVICE ADJUSTMENT.

. TROUBLE SHOOTING TABLE
. CHASSIS LAYOUT DIAGRAM

. PRINTED WIRING BOARD ASSEMBLIES .....

. BLOCK DIAGRAMS
. SCHEMATIC DIAGRAMS AND

WAVEFORMS.

. REPLACEMENT PARTS LIST

CONTENTS

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NC-6 CHASSIS

In the interests of user-safety (Required by safety regulations in some
countries) the set should be restored to its original condition and
only parts identical to those specified should be used.

ELECTRICAL SPECIFICATIONS a-w,

page

1

Aerial Input Impedance
Convergence

2

Focus

3

6

.ll
.13
.15

.19
.24

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

Audio Power Output Rating

Intermediate Frequencies

Picture IF Frequency
Sound Carrier Trap

Adjacent Sound Carrier Trap
Power Input
Power Consumption

Speaker
Sweep Deflection
Tuning Ranges

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10cm

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

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75 ohm unbalanced

Self Converging System

Bi-potential electrostatic

2.OW

max.

36875MHz

31.375MHz

38.375MHz

240V AC 50Hz

12OW

Round Dynamic x 1 pc.

Magnetic

VHF Channels 0 thru 11

UHF Channels 28 thru 63

The

chassis in

power

receptacle, when servicing this

To

prevent electric

qualified service personnel.

this receiver is

shock, do

1

Specifications are subject to change without prior notice

WARNING

partially

not remove

hot.

chassis.

cover.

Use an

isolation

No

user

transformer

-

serviceable parts inside. Refer servicing

SHARP CORPORATION

between

the

line

cord plug and

1

to

IMPORTANT SERVICE NOTES

Maintenance and repair of this receiver should be done by qualified

service

personnel only.

SERVICING OF HIGH VOLTAGE

SYSTEM AND PICTURE

TUBE

When

servrcrng

connectrng

is

a test probe) between picture tube tag and 2nd anode lead. (AC

ine cord should be disconnected from AC outlet.)

1. Picture tube in

2. Replace with tube of the same type number for continued safety.

3. Do not lift picture tube by the neck.

4. Handle the picture tube only when wearing shatter-proof goggles and
after discharging the high voltage completely.

the

hrgh

a 10k ohm

thus

voltage system, remove static charge from it by

Reststor

receiver employs integral Implosion protection.

in series wtth an Insulated wire (such

X-RAY

This

receiver IS designed so that any X-ray radiation IS kept to an

absolute minimum. Since certain malfunctions or

duce potentially hazardous rediation with prolonged exposure at close

range, the following precautions should be observed:

1.’

When repairing the circuit, be sure not to increase the high voltage to

more the

2. To keep the set in a normal operation, be sure to make it function
on
has been factory-adjusted to the above-mentioned high voltage.

.‘.

If there is a possibility that the high voltage fluctuates as a result

3. Do not substitute a picture tube with unauthorized types and/or
brands which may cause excess X-ray radiation.

30kV,

(at beam 1 .l

27.5kV _+

of the repairs, never forget to check for such high voltage after
the work.

1.5 kV (at beam 1.3

mA),

mA) In

for the set.

the case of the set. The set

servicing

may pro-

BEFORE RETURNING THE RECEIVER

Before returning the receiver to the user, perform the following safety
checks.

1. Inspect all lead dress to make certain that leads are not pinched or
that hardware is not lodged between the chassis and other metal
parts in the receiver.

2. Inspect all protective devices such as non-metallic control knobs,
insulating fishpapers, cabinet backs, adjustment and compartment
covers or shields, isolation resistor-capacity networks, mechinira!
insulators etc.

2

SERVICE ADJUSTMENT

Precautions:

How to prevent

tricity

1. When replacing or handling the IC, be sure to put on
your wrist a metal ring (earth

-

to ground.

*

Avoid touching the IC directly by hand as much as

--_

possible.

2. For the soldering iron and other jigs in use, be sure to
connect them to ground so that their potential is the
same as that of the PWB and/or IC.

3. The PWB cannot be connected to ground in some con­dition although you attempt to attach the rC to that
PWB. In this case, be sure to keep the PWB at the same
potential as ground by touching it by your hand on
which a metal nng is put.

4. When handling the
wear such clothes as not causing static electricity; the
ones of wool, silk or synthetic fiber should be avoid­ed. This is Important in particular when handling the
IC In a dry environment.

ICs

from damages due to static elec-

ring1

that is connected

IC,

it is recommended for you to

__

3.

Connect the response lead to TP207.

4.

Connect a resistor of 100 ohms to both ends of
R235 (10k ohms).
Note: Keep the lead of the 100 ohm resistor as
short as possible.

5.

Apply AGC voltage to AGC
voltage so that the waveform on oscilloscope is 1

VP-P.

6.

Make sure that the overall waveform is as shown
in the figure below. If not, adjust it with the aid of
IF transformer of the tuner.

(TP203)

and adjust AGC

Note:

P-detector coil adjustment: T201

2. Connect the response lead of oscilloscope to

3.

4. Adjust AGC voltage so that the waveform on oscil-

5. Adjust T201 so that the waveform peak on oscillo-

Perform

ing

1. Connect sweep output to

l Sweep central frequency:

l Sweep output: 80

TP207.

Apply

AGC voltage to AGC

Note: The AGC voltage should not exceed 7V.

loscope becomes 1 Vp-p.

scope becomes aligned with P marker.

the service

adjustment

the procedures shown below.

TP202.

36.875MHz

dB

(TP203).

follow-

T

1

VP-P

T

i

Overall waveform

1. Receive

2. Connect sweep output to the tuner test point

through the specified jig.

l Sweep output: 70

loch.

signal.

dB

1

36.875 MHz

IF transformer

AFT adjustment: T202

1. Receive sequential colour bar signal.

2. Connect
capacitor of

3. Connect oscilloscope to TP207.

l Oscilloscope range:

4. Adjust the output of
the waveform beating on oscilloscope be ob­servable.

5. Adjust the tuning control so that the waveform on
oscilloscope is free from beating.

l Set the band switch at VHF position and adjust

the tuning control.

6. Set the band switch at normal position and adjust
TP202 so that the waveform on oscilloscope is free
from beating.

l Turn on AFT switch.

Note: Set the RF AGC control

36.875MHz
1pF.

normal picture.

oscillator to TP202 across a

36.875MHz

0.5V/cm

AC

oscillator to have

(R224)

to

obtain

gztor’s e-4hk-+

output

,.8K &-g-o

~redds”t

Adjust for zero-beating.

3

RF AGC cut-in adjustment: R224

1. Receive 10 ch. signal.

2. Set the signal input level at 52 + 1

dB.

3. Connect CR oscillator to TP204 across a capacitor
of lOpF/16V: This capacitor is to cut off DC supply.

l Oscillation frequency:
l Output voltage: 0.1 Vp-p (Output

1kHz

sine wave.

voltage availa-

ble at TP204)

4. Adjust R224 so that 1 kHz signal disappears from
TV screen.

5. Set the signal input level at 52 + 3 dB and check
that 1 kHz signal appears on TV screen.

If

1 kHz signal does not appear, set the input sig­nal level at 52 dB again and follow the procedure
in step 4 again.

Sub-brightness adjustment: R421

1. Turn S501 on by tipping it rightwards in order to let
the raster be linear.

2. Set each control as follows:

l Screen control: at MIN position
l Sub-brightness control (R421): at MIN position
l R-bias control
l G-bias control
l B-bias control
l G-drive control
l B-drive control
l Contrast control: at MIN position
l Brightness control: at CENTER position
l Picture tone control: at CENTER position
l Colour control: at MIN position

(R862)
(R863)

(R864)

(R857-A)

(R857-B)

3. Receive lion head pattern signal.

4. Connect oscilloscope to TP850.

5. Adjust R421 so that the waveform on oscilloscope
is at 15 Vp-p.

12. Adjust each drive control for good white balance.

l Colour temperature:

7300OK

x=0.303

(

Y=O.310

)

13. Adjust brightness control and contrast control to
obtain a dark picture. If the white balance is dis­turbed, adjust the bias control to obtain good
white balance.

14. Again brighten the picture and adjust each drive
control for good white balance as in step 12 above.

Carrier wave-phase adjustment: R826

1. Receive sequential colour bar

signal.

2. Connect oscilloscope to K4 terminal (blue) and ad­just synchronism of oscilloscope to obtain the

waveform as shown in the figure below.

minimum

3. Adjust the phase control so that the

l-l

part@of

B-Y
output waveform becomes minimum as shown in
the figure above.

Sub-colour adiustment: R817

1. Receive sequential colour bar signal.

2. Set each control as follows:

l Contrast control: at MAX position
l Brightness control: at CENTER position
l Colour control: at CENTER position
l Picture-tone control: at CENTER position

3. Connect oscilloscope to TP850.

4. Adjust R817 so that the white output (75%) and
red output will have the same level.

Background adjustment: Screen control R862 R863
R864

R857-A/B

6. Remove oscilloscope from TP850.

7. Adjust the screen control so that raster of red,
green, or blue appears dimly on screen.

8. Adjust the bias controls except for dimly appear­ing colour to let the picture on screen be white.

9. Adjust the screen control to obtain cut-off point
of CRT.

10. Turn S501 off by bringing it back to the center in
order to resume the normal raster.

11. Set the contrast control at MAX position.

Horizontal Size adjustment:

1.

Receive lion head pattern signal.

2. If the horizontal size is at less than 7% of
ning, insert the socket into the opening (2).

Vertical size adjustment: R525

3. Adjust R634 to have proper horizontal center.

4

overscan-

Vertical linearity adjustment:

R520

-

Protector check

1. Receive lion head pattern signal.

2. Adjust R520 to obtain good vertical linearity.

Vertical

size

adjustment:

R525

,* .I --

3. Adjust R525 to have 10% of the vertical overscan.

Vertical center adjustment:

S502

--

1. If the vertical center of picture is 3mm higher than
the center of CRT, set
it is 3mm lower than the center of CRT, set

S502

at “down” position. If

S502

at “up” position.

1. Apply

.that

DC25V

to D605 (cathode side), and check

the protector remains inoperative.

2. Apply DC 30V to D605 (cathode side), and check

__ _

.

that the protector gets operative.

3.-Connect

a resistor

(10k

ohms) between base of
Q603 and ground, and check that the protector
gets operative.

-

-

5

_-

Checked Circuits

l Power Regulator Circuit

0

Horizontal Deflection Circuit

l Picture tube Bios Circuit
l Video Circuit

0 Picture tube

TROUBLE SHOOTING

r

When the power switch is push on,

is there caused a raster?

t

TABLE

: -! - _- : ..:- -__ I__ \

.

No

Are the Fuse

blown?

I

No

(F7001)

Yes

t

v

Replace the tuse
with new one

_ _.

Yes

_.

.- ^

t

,

Norma I

c

The tuse is ogain

.

blown out

Abnorma I

r-----

----1

Checked Circuits

l Horizontal Output Circuit

Check
R640 and Horizontal
Drive Circuit

I L606
L------------A

Q601, T601,

I

Normal

and R636

L---------a

.

NO HRIZONTAL SCANNING

Abnorma I

1

I------- -----

I

Check

1

R640 and- Horizontal

I Drive Circuit

L------------d

t

t

(2601, T601,

a------m--d

1

l
1

I

I

A bnormo I

l

OSC . Circuit

L----------d

w--m-

1

I

I

6

[ C,heck

for

T70l pin@)

Normal

1

Check for the CRT ,

heater vol toge

I

Abnormal

w--e
I

I

L

1

a----

Check

0631

--B-m---

Check for the

screen voltage

(Approx:

Abnormal

.

1

J

A

Normal

,

Check for the voltage
of

0712

(Approx:

,

I
I

Check for the Bias

circuit of picture

tube

55OV)

I

,

Norma I

t

cathode

ll5V)

/

*

Check for the

COI lector

(Approx: IOOV)

1

1

1

--e-e

Check 0712

I

I

D7lO

L

.

-

4

voltage Check

Check

0710

Abnorma I

--------a

Q85l

’

Abnormal

1

D712

I

L

m--y

andl

--------A

and

I

-

Check

c

Norma I

t
T70l

R713 and

,

C706

R7ll

I

Normal

1

IC7Ol

----- ----

I

Check

L SG854

I

C861

and

---------A

!Check IC701 1
L-------d

r-e--

1

1

I

i

Check IC8Ol,Q851,~

I

0852,0853,D802,l

lLD803,

I

-----

and

---------

D804J

.

Abnorma I

1

Check

7

i

-- --

r

; Q50l 1
I Q502 1

------a

1

----am-

i

Check

Q853,

Q855,

I

I

L

1

0501 und Q502

I

Normal

LT-’

t

-e-e-)

0851, Q852, i

0854,

and

----------

0856

.

1

A

7

Checked Circuits
STF Amplifier Circuit
Sound Detector Circuit
Audio

Output

Circu 1

t

.

NO SOUND

1

,

1

Check

L301, C3lO

f

CF3OI

Check for the

Norma I

t

When the sound control
is set at MAX, does noise

increase

3

I

1

No, or very small

I

f.----- -a----,

C306, C307, f

and

i

Check

I

C317, R3lO,IC202

I

I and

L

-----------A

I

t

_I

C314,C315,

iC3Ot

pin@of

1

I

j

,

I

TC30l

(l2V)

1

Check

L703, 0714, t

1 C733) C735)

I and R730

-L

-------a---

c734,

f

I

J

Checked Circuits

0 Vertical Output Circuit

Check
and bias control
circuit.

- _

r-----

0501,

-----

1

NO VERTICAL SCANNING

Waveform at Collector
of

Q503

is normal

,

Q502

-

1

?

Abnormo I

_

. .

. .

- -

.-

Checked Circuits

l P-IF Circuit
l AGC Circuit
l Tuner Circuit

l

tB

Supply Circuit

IN0

PICTURE, NO SOUND

1

Norma I Abnormal

t

When band switch is

changed, does VT change?

Check tuner,

AGC and bias

control circuits

,

yet the reception is

Check for tuner
BU, BH, BL and B

(about

IZV)

I

I

Check for

f
l

Band Selector Circuit.

L-,------,--,,A

I

IC201,

and yet only the sound
changes remarkably.

b

%~?~~~~~~~~~

voltage at

pln@of IC202

Normal

i-’

I

I

1

Check IC201,l

;

T201,

l L2ll,L2lO, l

I and

CF202

I-

----e-

R233,;

I

J

the

IS

l2V

Abnormal

7

t

Normal

r

I Check tuner,

L2!rE!!t-~~--

----

. .

J

-- ----

bheck

CF2Ol

c--e-- ------

Check R220, R217,

i

I

1 R218
L---,-----,,d

t

l

and C235 I

1
I