Panasonic CT-13R17B, CT-13R27W, CT-13R37S Diagram

ORDER NO. MTNC020409C1 B1

Service Manual

Color Television

Main Manual

Panasonic

Models

CT-13R17B CT-13R27W CT-13R37S

This service manual is issued as a service guide for the models listed above. Included in this manual are a set of schematic, block diagrams, functional descriptions, alignment procedures, disassembly procedures and a complete parts list.

Chassis

TMB535 TMB535 TMB535

“WARNING! This Service Manual is designed for experienced repair technicians only and is not designed for use by the general public. It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair the product or products dealt with in this Service Manual by anyone else could result in serious injury or death.”

The service technician is required to read and follow the “Safety Precautions” and “Important Safety Notice” in this Main Manual.

CONTENTS

CONTENTS .................................................................................................................................................

Important Safety Notice ............................................................................................................................

Service Notes .............................................................................................................................................

GENERAL SPECIFICATIONS....................................................................................................................

DISASSEMBLY INSTRUCTIONS

1. REMOVAL OF ANODE CAP ............................................................................................................

2. NOTE FOR THE REMOVAL OF THE MAIN PCB............................................................................

SERVICE MODE LIST ................................................................................................................................

CONFIRMATION OF HOURS USED .........................................................................................................

WHEN REPLACING EEPROM (MEMORY) IC ..........................................................................................

ELECTRICAL ADJUSTMENTS

1. BEFORE MAKING ELECTRICAL ADJUSTMENTS .........................................................................

2. BASIC ADJUSTMENTS ....................................................................................................................

3. PURITY AND CONVERGENCE ADJUSTMENTS ...........................................................................

4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION)...................

BLOCK DIAGRAM......................................................................................................................................

PRINTED CIRCUIT BOARDS

MAIN/CRT ..............................................................................................................................................

SCHEMATIC DIAGRAMS

MICON/TUNER ......................................................................................................................................

CHROMA................................................................................................................................................

TV POWER.............................................................................................................................................

DEFLECTION/CRT ................................................................................................................................

SOUND/AV .............................................................................................................................................

VOLTAGE LIST ..........................................................................................................................................

WAVEFORMS .............................................................................................................................................

MECHANICAL EXPLODED VIEW .............................................................................................................

MECHANICAL REPLACEMENT PARTS LIST .........................................................................................

ELECTRICAL REPLACEMENT PARTS LIST...........................................................................................

A1-1 A2-1 A2-2, A2-3 A3-1~A3-3

B-1 B-1 C-1 C-1 C-1

D-1 D-1, D-2 D-3 D-4 E-1, E-2

F-1~F-4 G-1, G-2

G-3, G-4 G-5, G-6 G-7, G-8 G-9, G-10 H-1 I-1, I-2 J-1 K1-1 K2-1~K2-3

A1-1

Important Safety Notice

Special components are used in this television set which are important for safety. These parts are identified on the schematic diagram by the symbol and printed in BOLD TYPE on the replacement part list. It is essential that

these critical parts are replaced with the manufacturer's specified replacement part to prevent X-ray radiation, shock, fire or other hazards. Do not modify the original design without the manufacturer's permission.

Safety Precautions

General Guidelines

An Isolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from AC power line. Use a transformer of adequate power rating as this protects the technician from accidents resulting in personal injury from electrical shocks. It will also protect the Receiver from being damaged by accidental shorting that may occur during servicing. When servicing, observe the original lead dress, especially in the high voltage circuit. Replace all damaged parts (also parts that show signs of overheating.) Always Replace Protective Devices, such as fishpaper, isolation resistors and capacitors, and shields after servicing the Receiver. Use only manufacturer's recommended rating for fuses, circuits breakers, etc. High potentials are present when this Receiver is operating. Operation of the Receiver without the rear cover introduces danger for electrical shock. Servicing should not be performed by anyone who is not thoroughly familiar with the necessary precautions when servicing high-voltage equipment.

Extreme care should be practiced when Handling the Picture Tube. Rough handling may cause it to implode

due to atmospheric pressure. (14.7 lbs per sq. in.). Do not nick or scratch the glass or subject it to any undue pressure. When handling, use safety goggles and heavy gloves for protection. Discharge the picture tube by shorting the anode to chassis ground (not to the cabinet or to other mounting hardware). When discharging connect cold ground (i.e. dag ground lead) to the anode with a well insulated wire or use a grounding probe. Avoid prolonged exposure at close range to unshielded areas of the picture tube to prevent exposure to X-ray radiation. The Test Picture Tube used for servicing the chassis at the bench should incorporate safety glass and magnetic shielding. The safety glass provide shielding for the tube viewing area against X-ray radiation as well as implosion. The magnetic shield limits the X-ray radiation around the bell of the picture tube in addition to the restricting magnetic effects. When using a picture tube test jig for service, ensure that the jig is capable of handling 50kV without causing X-ray radiation.

Before returning a serviced receiver to the owner,

the service technician must thoroughly test the unit to ensure that is completely safe to operate. Do not use a

line isolation transformer when testing.

Leakage Current Cold Check

Unplug the AC cord and connect a jumper between the two plug prongs.

Measure the resistance between the jumpered AC plug and expose metallic parts such as screwheads, antenna terminals, control shafts, etc. If the exposed metallic part has a return path to the chassis, the reading should be between 240k and 5.2M . If the exposed metallic part does not have a return path to the chassis, the reading should be infinite.

Leakage Current Hot Check (Fig. 1)

Plug the AC cord directly into the AC outlet. Do not use an isolation transformer during the check. Connect a 1.5k 10 watt resistor in parallel with a

0.15µF capacitor between an exposed metallic part and ground. Use earth ground, for example a water pipe. Using a DVM with a 1000 ohms/volt sensitivity or higher, measure the AC potential across the resistor. Repeat the procedure and measure the voltage present with all other exposed metallic parts. Verify that any potential does not exceed 0.75 volt RMS. A leakage current tester (such a Simpson Model 229, Sencore Model PR57 or equivalent) may be used in the above procedure, in which case any current measure must not exceed 0.5 milliamp. If any measurement is out of the specified limits, there is a possibility of a shock hazard and the Receiver must be repaired and rechecked before it is returned to the customer.

AC VOLTMETER

COLD WATER PIPE (GROUND)

0.15µF

TO INSTRUMENT’S EXPOSED METAL PARTS

1500 ,10 W

Figure 1.

Hot Check Circuit

X-ray Radiation

WARNING: The potential source of X-ray radiation in

the TV set is in the High Voltage section and the picture

Note:

Set the brightness and picture controls to Minimum. Measure the High Voltage. The high voltage should be

24.5 ± 1.0kV. If the upper limit is out of tolerance, immediate service and correction is required to insure safe operation and to prevent the possibility of premature component failure.

It is important to use an accurate, calibrated high voltage meter.

A2-1

Service Notes

These components are affixed with glue. Be careful not to break or damage any foil under the

Note:

component or at the pins of the ICs when removing. Usually applying heat to the component for a short time while twisting with tweezers will break the component loose.

Leadless Chip Component (surface mount)

Chip components must be replaced with identical chips due to critical foil track spacing. There are no holes in the board to mount standard transistors or diodes. Some chips capacitor or resistor board solder pads may have holes through the board, however the hole diameter limits standard resistor replacement to 1/8 watt. Standard capacitor may also be limited for the same reason. It is recommended that identical components be used. Chip resistor have a three digit numerical resistance code

- 1st and 2nd significant digits and a multiplier. Example: 162 = 1600 or 1.6k resistor, 0 = 0 (jumper). Chip capacitors generally do not have the value indicated on the capacitor. The color of the component indicates the general range of the capacitance. Chip transistors are identified by a two letter code. The first letter indicates the type and the second letter, the grade of transistor. Chip diodes have a two letter identification code as per the code chart and are a dual diode pack with either common anode or common cathode. Check the parts list for correct diode number.

Component Removal

Use solder wick to remove solder from component end

1. caps or terminal. Without pulling up, carefully twist the component with

2. tweezers to break the adhesive. Do not reuse removed leadless or chip components

3. since they are subject to stress fracture during removal.

Chip Component Installation

1.2.Put a small amount of solder on the board soldering pads. Hold the chip component against the soldering pads with tweezers or with a miniature alligator clip and apply heat to the pad area with a 30 watt iron until solder flows. Do not apply heat for more than 3 seconds.

Chip Components

TYPE

ANODES

TRANSISTOR

GRADE

COMMON CATHODE

SOLDER CAPS

CAPACITOR

1ST DIGIT

RESISTORMH DIODE

SOLDER CAPS

2ND DIGIT

MULTIPLIER =1600 = 1.6k

A2-2

How to Replace Flat-IC

- Required Tools -

Soldering iron De-solder braids Needle nose pliers Magnifier Wire cutters (sharp & small)

Cut the pins of a defective IC with wire cutters.

1. Remove IC from board. If IC is glued to the board, heat the IC and release the IC. See Note above.

Flat IC

Using soldering iron and needle nose pliers remove

2. the IC pins from the board.

Soldering Iron

Using de-soldering braid and soldering iron remove

3. solder from affected are on board (pads).

De-soldering Braid

Soldering Iron

Position the new Flat-IC in place (apply the pins of

4. the Flat-IC to the soldering pads where the pins need to be soldered). Determine the positions of the soldering pads and pins by correctly aligning the polarity symbol. Solder pin #1 first, align the IC.

Polarity symbol

Solder the pin opposite to pin #1. This will assist positioning the IC.

Solder all pins to the soldering pads using a fine tipped soldering iron.

Solder

Check with a magnifier for solder bridge between

6. the pins or for dry joint between pins and soldering pads. To remove a solder bridge, use a de-solder braid as shown in the figure below.

Solder Bridge

2nd solder

De-Solder Braid

1st solder

Soldering Iron

Soldering lron

Service Notes (Continued)

IMPORTANT: To protect against possible damage to the

solid state devices due to arcing or static discharge, make certain that all ground wires and CTR DAG wire are securely connected.

CAUTION: The power supply circuit is above earth ground and the chassis cannot be polarized. Use an isolation transformer when servicing the Receiver to avoid damage to the test equipment or to the chassis. Connect the test equipment to the proper ground ( ) or ( ) when servicing, or incorrect voltages will be measured.

WARNING: This Receiver has been designed to meet or exceed applicable safety and X-ray radiation protection as specified by government agencies and independent testing laboratories.

To maintain original product safety design standards relative to X-ray radiation and shock and fire hazard,

parts indicated with the symbol on the schematic must be replaced with identical parts. Order parts from the manufacturer’s parts center using the parts numbers shown in this service manual, or provide the chassis number and the part reference number.

For optimum performance and reliability, all other parts should be replaced with components of identical specification.

A2-3

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