Motorola cp 468 d service manual

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television MANUAL 68P65155A20

CHASSIS TS-924B & C
3 MODELS CP468D, E & CP469D, E

MOTOROLA

GENERAL INFORMATION

This chassis contains a 20 tube
horizontal chassis employing 5 silicon
diodes in the power supply, a
transistorized color amplifier, color
killer and a keyed AGC system. The
CRT is independently wired to a

I.
9;} filament transformer, in addition the
S filament string is protected by a series
8 current limiting resistor.
on
w-
9 The dynamic convergence panel,
g speaker and yoke have plug-in
g connectors; all other connections are
d permanenfly cab'el- wave" 'eaF Model CP468D,E Model CP4690, E
0 lengths are adequate to remove chassls
g for test or repair. These models use a
polarized ("one-way fit") power plug
? designed to match polarized wall TABLE OF CONTENTS
I plugs. WHEN SERVICING CHASSIS,
ISOLATE FROM AC LINE WITH AN ALIGNMENT PROCEDURE .................. 20
ISOLATION TRANSFORMER. COLOR FREQUENCY 8: PHASE ............ 23
COLOR IF ......................... 22
§ 3 SOUND ........................... 23
§ n: HORIZONTAL OSCILLATOR ............. 23
gm ELECTRICAL SPEC'FICAT'ONS UHF TUNER (TT-622) .................. 30
w P
3 '2 Source: 120V, 60 cycle AC - 250 watts VHF TUNER (TT-415) .................. 24
g 2 VIDEO IF .......................... 20
gm INTERMEDIATE FREQUENCIES GENERAL INFORMATION 1
< ..................
a Video |F; Video Carrier 45.75Mc INSTALLATION & ADJUSTMENTS ............. 4
Sound Carrier fII-ZSIVIC CONVERGENCE PROCEDURE ............. 6
3; cm subca'r'er 4217 MODEL BREAKDOWN CHART ................ 1
3 Sound IF: 4.5Mc REPLACEMENT PARTS LIST ................. 32
3 Color IF= 3-58'VIC SAFETY PRECAUTIONS .................... 2
SCHEMATIC DIAGRAM (CHASSIS) ............. 36
MODEL BREAKDOWN CHART SERVICE INFORMATION ................... 8'
VHF UHF COLOR PANEL ...................... 14
MODEL CHASSIS TUNER TUNER CRT CRT REPLACEMENT .................. 10
CP4680N C14TS-924 CPTT-415 KTT-622 15$P22 COLOR AMPLIFIER PANEL -------------- 18
y, CP468EN C14TS-924 CPTT«415 KTT-622 15$P22 SERVICE HINTS ..................... 10
,4 CP4690W D14TS-924 OPTT-415 KTT-622 15$P22 SWEEP& SYNC PANEL ................. 16
CP469EW D14TS~924 OPTT-415 KTT-622 15$P22 VIDEO IF & SOUND PANEL 15

MOTOROLA INC. 9401 WEST e RAND AVEN U E. FRAN KLIN PARK. ILLINOIS
PART NO. 68P65155A20 6-68 PRICE $1.00 COPYRIGHT 1968 BY MOTOROLA INC. - PRINTED IN U.S.A.

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SAFETY WARNING

CAUTION: NO WORK SHOULD BE ATTEMPTED ON AN EXPOSED TELEVISION CHASSIS BY
ANYONE NOT FAMILIAR WITH SERVICING PROCEDURES AND PRECAUTIONS.

1. SAFETY PROCEDURES should be developed
by habit so that when the technician is rushed
with repair work, he automatically takes
precautions.

2. A GOOD PRACTICE, when working on a
receiver, is to use only one hand when testing
circuitry. This will avoid the possibility of
carelessly putting one hand on chassis or ground
and the other on an electrical connection which
could cause a severe electrical shock.

3. Extreme care should be used In HANDLING
THE PICTURE TUBE as rough handling may
cause it to implode due to atmospheric pressure
(14.7le. per sq. in.). Do not nick or scratch glass
or subject it to any undue pressure in removal or
installation. When handling, use safety goggles and
heavy gloves for protection. Discharge picture tube
by shorting the anode connection to chassis
ground (not cabinet or other mounting parts).
When discharging . . .go from ground to anode or
use a well insulated piece of wire.

Avoid prolonged exposure at close range to
unshielded areas of the cathode ray tube. Possible
danger of personal injury from unnecessary
exposure to X-ray radiation may result.

4. An ISOLATION TRANSFORMER should
always be used during the servicing of a receiver
whose chassis is common to one side of the power
line. Use a transformer of adequate power rating as
this protects the servicemen from accidents
resulting in personal injury from electrical shocks.
It will also protect the receiver and its components
from being damaged by accidental shorts of the
circuitry that may be inadvertently introduced
during the service operation.

5. Always REPLACE PROTECTIVE DEVICES,
such as fishpaper, isolation resistors and capacitors
and shields after working on the receiver.

6. Do not operate the unit with the HIGH
VOLTAGE COMPARTMENT OPEN or the cage
removed. The cover must be in place and fastened
in order to assure proper shielding. This will
protect against the possibility of personal injury
resulting from unnecessary exposure to X-ray
radiation from the high voltage rectifier tube.

7. The HIGH VOLTAGE should always be
ADJUSTED to the level recommended by the
manufacturer. If the voltage is increased above the
normal setting, exposure to unnecessary X-ray
radiation could result. High voltage can accurately

be measured with a high voltage meter connected
from the anode lead to chassis.

8. The TEST PICTURE TUBE used for servicing

the chassis at the bench should incorporate a
safety glass and magnetic shield. The safety glass
affords shielding from the tube viewing area
against X-ray radiation as well as implosion
protection. The magnetic shield limits X-rav
radiation around the bell of the picture tube in
addition to restricting magnetic effects.

9. BEFORE RETURNING A SERVICED
RECEIVER (of any type) TO THE OWNER, the
service technician must thoroughly test the unit to
be certain that it is completely safe to operate
without danger of electrical shock. DO NOT USE
A LINE ISOLATION TRANSFORMER WHEN
MAKING THIS TEST.

In addition to practicing the basic and
fundamental electrical safety rules, the following
test, which is related to the minimum safety
requirements of the Underwriters Laboratories
should be performed by the sen/ice technician
before any receiver which has been serviced is
returned to the owner.

A 1000 ohm per volt AC voltmeter is prepared by
shunting it with a 1500 ohm, 10 watt resistor. The
safety test is made by contacting one meter probe
to any portion of the receiver exposed to the
consumer or operator such as the cabinet trim,
hardware, controls, knobs, etc., while the other
probe is held in contact with a good earth"
ground such as a cold water pipe.

/Im OIIMIVOLT IOR HIGKKI )C VENEER

NOTES: I Rsz EACH CKCK mm THE UK com KVERSED
IN TIE PUNER OUTLET.

Z MEYER mums Muff not Exam 7-1/2 VOLTS AC.

EXPOSED PART II CABIN...

A A .
GROUND mormmu to ANY um SWELLASWEB an
GROUND SUCH AS A COLD WATER PIK\

15W OHM ll) WAIT RISISIOR
msuurok \ _

Va/tmeter Hook-up for Safety Check

The AC voltage indicated by the meter may not
exceed 71/: volts. A reading exceeding 7V2 volts
indicates that a potentially dangerous leakage path
exists between the exposed portion of the receiver
and "earth" ground. Such a receiver represents a
potentially serious shock hazard to the operator.

The above test should be repeated with the
receiver power plug reversed.

NEVER RETURN A RECEIVER TO THE
CUSTOMER which does not pass the safety test
until the fault has been located and corrected.

"No! in» OFMEIER '0 mil