Panasonic CT-2017F Service Manual

ORDER NO. MT NC020410A1 B1

Service Manual

Color Television

Simplified Manual

(NA7DM)

Panasonic

Model

CT-2017F AP391

Chassis

This Simplified Service Manual is issued to add listed models to the Main Service Manual order No. MTNC010303C1(CT-20R6E). A set of schematics, unique settings and a complete parts list are included in this Manual. Please file and use this Simplified Service Manual together with Main Service Manual, order No. MTNC010303C1 .

“WARNING! This ServiceManualis designed forexperiencedrepairtechnicians only and is not designedfor use bythe general public. It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Productspowered byelectricityshouldbeservicedorrepairedonlybyexperiencedprofessionaltechnicians.Anyattempttoservice 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 requiredtoreadand follow the “Safety Precautions”and“Important Safety Notice” in this Main Manual.

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,suchas 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 35kV 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 connecta 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 240kΩ and

5.2MΩ. 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 1.5kΩ 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

1500Ω,10 W

Figure 1. Hot Check

X-ray Radiation

WARNING: The potential source of X-ray radiation in the

TV set are the High Voltagesection and the picture tube. Refer to X-RAY PROTECTON CIRCUIT CHECK in Service Notes in this manual to confirm HHS Volt age.

High Voltage (CRT Anode)

Confirm Anode voltage is within limits: Set the BRIGHTNESS, PICTURE, SHARPNESS and COLOR to minimum (To obtaina dark image). Measure High Voltage. It should be:

26.60±1. 25 kVfor CT-2017F

If the upper limit is out of tolerance, immediate service and correction is required.

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

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About lead free solder (PbF)

Note: Lead is listed as (Pb) in the periodic table of elements. In the information below, Pb will refer to Lead solder, and PbF will refer to Lead Free Solder. The Lead Free Solder used in our manufacturing process and discussed below is (Sn+Ag+Cu). That is Tin (Sn), Silver (Ag) and (Cu) although other types are available.

This model uses Pb Free solder in it’s manufacture due to environmental conservation issues. For service and repair work, we’d suggest the use of Pb free solder as well, although Pb solder may be used.

PCBs manufactured using lead free solder will have the PbF within a leaf Symbol stamped on the back of PCB.

Caution

• Pb free solder has a higher melting point than standard solder. Typically the melting point is 50 ~ 70 °F(30~40°C) higher. Please use a high temperature soldering iron and set it to 700 ± 20 °F(370± 10 °C).

• Pb free solder will tend to splash when heated too high (about 1100 °For600°C). If you must use Pb solder, please completely remove all of the Pb free solder on the pins or solder area before applying Pb solder. If this is not practical, be sure to heat the Pb free solder until it melts, before applying Pb solder.

• After applying PbF solder to double layered boards, please check the component side for excess solder which may flow onto the opposite side. (see figure below)

remove all of the

excess solder

component

slice view

solder

Suggested Pb free solder

There are several kinds of Pb free solder available for purchase. This product uses Sn+Ag+Cu (tin, silver, copper) solder. However, Sn+Cu (tin, copper), Sn+Zn+Bi (tin, zinc, bismuth) solder canalsobeused.

0.3mm X 100g

0.6mm X 100g 1.0mm X 100g

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ImportantSafetyNotice...................2

Safety Precautions .................2

About Lead Free Solder (PbF) ........3

ServiceNotes...........................5

X-Ray protection circuit check .........6

ReceiverFeatureTable ...................7

AudioSignalPathBlockDiagram..........13

VideoSignalPathBlockDiagram..........14

PartsList..............................16

SchematicNotes........................22

Schematics

Location of Controls (Receiver)

Receiver Front Control Panel .........8

DisassemblyforService..................9

MainComponentsLocation ..............11

A-Board ...........................24

C-Board ...........................32

Voltages and Waveforms

Voltages (A,C-Boards)..............29

Waveforms.......................31

Layouts

A,C-Boards ........................34

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Service Notes

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

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 resistanc e code - 1st and 2nd significant digits and a multiplier. Example: 162 = 1600 or 1.6kΩ resistor, 0 = 0Ω (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

1. Use solder wick to remove solder from component end caps or terminal.

2. Without pulling up, carefully twist the component with tweezers to break the adhesive.

3. Do not reuse removed leadless or chip components since they are subject to stress fracture during removal.

Chip Component Inst allation

1. Put a small amount of solder on the board soldering pads.

2. 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.

TYPE

ANODES

MH DIODE

Chip Components

GRADE

TRANSISTOR

COMMON CATHODE

SOLDER CAPS

CAPACITOR

1ST DIGIT

RESISTOR

SOLDER CAPS

2ND DIGIT

MULTIPLIER =1600 = 1.6k

How to Replace Flat-IC

- Required Tools -

• Soldering iron • De-solder braids

• Sharpen pliers (wire cutters and long nose)

1. Cut the pins ofthe defective IC with the wire cutters pliers, and remove it completely away from the board. If the IC is glued to the board, apply hot air to complete the removal. CAUTION- Do not pull or twist the pliers, may damage the soldering pads in the board.

Flat-IC

2. UsingtheSolderingIronandthelongnosepliers, remove the IC pins that still attached to the board.

3. Using the De-solder braid and the Soldering Iron, remove the solder from the board soldering pads.

4. Position the new Flat-IC in place (apply the pins of the Flat-IC to the soldering pads where the pins need to be soldered). Properly determine the positions of the soldering pads and pins by correctly aligning the polarity symbol. Start aligning and soldering Pin No.1, then align and solder the pin in the apposite corner of the IC, this will help to align the rest of the pins.

Polarity Symbol

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

Solder

6. Check with a magnifier for solder bridge between 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

-5-

• Magnifier

Soldering Iron

De-Solder Braid

Soldering Iron

De-Solder Braid

Soldering Iron

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.

Procedure:

1. Connect receiver to Isolator Transformer.

2. Apply a monoscope pattern.

3. In Service Mode. (Refer to Service Mode Section) Select Register C0b.

4. Measure TP5 (TPs port close to tuner). Compare the measure of TP5 and set the data for C0b according the following table

TP 5

MEASURE (V)

DATA TO

C0b (Hex)

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.

X-RAY PROTECTION CIRCUIT CHECK

This test must be performed as final check before the Receiver is returned to the customer. If Voltage is out of tolerance, immediate service and correction is required to insure safe operation and to prevent the possibility of premature component failure.

Equipment needed to check the protection circuit:

1. Isolator transformer.

2. High voltage meter.

3. Short jumper.

4. Diode connection jumper

Use similar diode than D823, refer to parts list for part No., (Diode should support at least 150V.)

0 ~ 0.93 00

0.93 ~ 0.97 01

0.97 ~ 1.01 02

1.01 ~ 1.05 03

1.05 ~ 1.09 04

1.09 ~ 1.13 05

1.13 ~ 1.17 06

1.17 ~ 1.21 07

5. Exit Service Mode and turn Receiver OFF.

6. Connect a jumper from TPD16 to TPD17.

7. Connect the

Diode jumper

,cathodetoTPD14

(COLD GND), anode to TPD15 (HOT GND).

8. Apply 75 V AC to the AC input of the Insulator transformer.Turn receive ON.

9. Set PICTURE and BRIGTHNESS to minimum.

10. Increase the AC voltage at the input of Insulator transformer and confirm the HHS Voltage is 32kV, at the point set starts to loose sync,

11. Reset picture controls to original levels.

12. Turn the set OFF, and remove all jumpers and connections from chassis.

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Receiver Feature Table

FEATURE\MODEL CT-2017F

Chassis No AP391 Family NA7DM Receiving System NTSC # of channels 181 Menu language ENG/SPN/FRN Closed Caption X V-Chip USA/CANADA 75 Ω input X Remote Model # EUR501450 Picture tube Type PANABLACK Picture tube Supplier SAMSUNG Comb Filter 2DIG V/A norm V MTS/SAP/DBX X Built-in audio power 1.5Wx2 (10%) # of speakers 2 AI Sound X A/V in (rear/front) 1(1/1) EPJ/HPJ/MISC HPJ Dimensions mm

(WxDxH) in Weight (kg/lbs) 20/44.09 Power source (V/Hz) 120/60

Anode voltage Video input jack 1Vp-p 75Ω, phono

Audio input jack 500mV rms, 47KΩ A-Board TNP2AH040 DH* C-Board TNP2AA106 AF*

515.7x490.5x461.7

20.30x19.31x18.17

26.6

±1.25 kV

Table 1. ReceiverFeatures

*Note: When ordering a Board, add and ” S” after the Board suffix application.

Example, If Order A-Board for CT-2017F, should be ordered as: TNP2AH040S.

Specifications are subject to change without notice or obligation. Dimensions and weights are approximate.

-7-

Location of Controls (Receiver)

Figure 2. Location of Controls (Receiver).

POWER VOLUME CHANNEL ACTION TV/VIDEO

1 2 4 53

Quick Reference Control Operation

Quick Reference

Control Operation

Power Button - Press to turn ON or OFF. Volume Buttons - Press to adjust Sound Level, or to adjust Audio Menus, Video

Menus, and select operating features when menus are displayed Channel Buttons - Press to select programmed channels. Press to highlight desired

features when menus are displayed. Also use to select Cable Converter box channels

after programming Remote Control Infra-red codes (the TV/AUX/CABLE switch must be set in CABLE position).

Remote Control

Sensor

(Actualappearance

may vary)

HPJ & A/V

Jacks

Action Button - Press to display Main Menu and access On Screen feature and

Adjustment Menus.

TV/Video Button - Press to select TV or Video Input.

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Dissasembly for Service

Back Cover

Remove all the screws marked with an arrow( ) from the back of the receiver.

Note: Screw configuration, type, and number of screws vary depending on the model of the Receiver serviced and the application; various models are covered in this Manual. Use same hardware when reassembling the receiver.

• 2 screws at the top edge of the Receiver.

• 2 screws at the lower corners of the Receiver.

• 1 screw by the A/V jacks.

• 1 screw by the Fly-back assembly.

A-Board - Main Chassis

1. Pull carefully the tab in the chassis rail, at the left side of the main chassis, this will release the rail from the cabinet. See Fig 3.

2. Slide the chassis and rail completely out of the guide rails of the cabinet.

3. Stand the receiver on its edge. The underside of the board is completely accessible for component replacement.

Note: Some tie-wraps that secure the wire dressings may need to be unfastened for chassis removal.

4. When reassembly, place the chassis rail on the cabinet, then place the main chassis, be sure is in the rails at both sides, then push all the way to the front.

C-Board - CRT Output

Plugs into the socket on the CRT neck. To release the Focus wire, use a flat tool to release the tab in the socket,

Release” on page 9

remove the wire by pulling away the socket re-insert, close the wire-look by pushing until is secured with the tab, and insert the wire into the socket

See Fig. 4“Focus Wire

,Apull the wire-look up and

Figure 4. Focus Wire Release

Speakers

Speakers are secured to the cabinet’s front with 2 screws in diagonal (opposite corners).

Keyboard Push Button Assembly

Fastened to the inside of the cabinet front with 1 screw.

Figure 3. Chassis Rail Detail

Disassembly for CRT Replacement

1. Discharge the CRT as instructed in the Safety Precautions (see page 2).

2. Disconnect the yoke (DY) plug and degaussing coil (DEG) plug from the main board.

3. Unplug the CRT 2nd anode button.

4. Remove the C-Board from the CRT base and unplug the black wire (CRT dag ground) C10.

5. Disconnect Speakers plug SP from the A-Board.

6. Lift the Main Chassis (A-Board) completely out with theCRTBoardattached.

-9-

Back Cover Disassembly

Figure 5. Back Cover Removal

• 2 Screws at the top edge

• 1 Screw in each lower corner

• 1 Screw by the A/V Jacks

• 1 Screw by the Flyback Assembly.

-10-

CRT

(Secured to Cabinet

by4ScrewsonCorners)

Yoke

Wedge

Main Components Location

ANODE

(HIGH VOLTAGE)

Deflection Yoke

Convergence Yoke

Degaussing

Coil

Speakers

Secured by

2 Screws

A-Board

Main Chassis

Tuner A/V

JACKS

Figure 6. Rear View

C-Board

CRT Panel

Flyback Dag Ground

-11-

+ 25 hidden pages

Panasonic CT-2017F Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual