PHILIPS 25PT10C121 Technical Service

Page 1

Philips Consumer Electronics

Technical Service Data

Service Solutions Group Technical Publications Dept. P.O. Box 555 401 East Old City Johnson Hwy. Jefferson City, TN 37760

Manual 7583

Model no.: 25PT10C121 Chassis no.: 25F8 First Publish: 10-9-2000 Rev. Date: 3-21-2001 Print Date: 4/12/2003

TABLE OF CONTENTS

General Information Training Information Mechanical Assembly/Disassembly Mechanical Diagrams Mechanical Adjustments Electrical Adjustments Schematic Diagrams and PCBs Scope Patterns Troubleshooting Service Bulletins and Important Information Parts List

REFER TO SAFETY GUIDELINES

SAFETY NOTICE: ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.

CAUTION: USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING

Visit our World Wide Web Site at http://www.magnavox.com

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Page 2

Philips Consumer Electronics

Technical Service Data

Service Solutions Group Technical Publications Dept. P.O. Box 555 401 East Old City Johnson Hwy. Jefferson City, TN 37760

Manual 7583

Model no.: 25PT10C121 Chassis no.: 25F8 First Publish: 10-9-2000 Rev. Date: 3-21-2001 Print Date: 4/12/2003

General Information

REFER TO SAFETY GUIDELINES

CAUTION: USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING

Visit our World Wide Web Site at http://www.magnavox.com

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Page 3

F8 CHASSIS INTRODUCTION

The F8 chassis is a leader TV chassis produced by Philips Consumer Electronics Company for the 1999 model year. The F8 chassis is used in sets with 25“ and 27“ screen sizes. The F8 chassis is a global design and is oriented front to rear, or ”north to south“, as it has been called. The F8 chassis tuning system features 181 channels with on-screen display (OSD). The main tuning system uses a tuner, a microcomputer IC, and a memory IC mounted on the main chassis. The microcomputer communicates with the memory IC, the customer keyboard, remote receiver, U/V tuner, signal processor IC and the audio output IC via the

I2C bus. The memory IC retains the settings for favorite stations, customer-preferred settings, and service/factory data.

The F8 chassis uses a Very Large Scale (VLSI) Integrated Circuit for signal processing. This IC performs video IF, sound IF processing, AGC control, horizontal and vertical drive and synchronization, also luminance/chrominance processing. The on-screen graphics and closed caption decoding are done within the microprocessor, and then sent to the signal processor IC to be added to the main signal.

The F8 chassis utilizes a switch mode power supply for the main voltage source. The chassis has a hot chassis ground reference on the primary side of the power supply, and a cold ground reference on the secondary side of the power supply and the rest of the chassis. ALWAYS USE AN ISOLATION TRANSFORMER

WHEN SERVICING THIS CHASSIS FOR YOUR SAFETY.

MODEL TO MODULE LIST

The model to Module list shown below identifies all electrical panels, modules and assemblies used in each model produced with the F8 chassis. This information was current at time of printing.

Information concerning cabinet parts and cabinet mounted parts (CRT/Yoke/etc.) is shown in the Cabinet Replacement Parts List.

Replacement part numbers for each module are provided in the Chassis Panel Replacement Parts List.

If you are attempting to service a model equipped with the F8 chassis, the necessary electrical information should be covered in this service manual, even if the corresponding model number is not listed.

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Model Panel Number Size Description

PHILIPS – MAGNAVOX MODELS

00OCC925-C121 25“ 00EMF891 A001 Main Chassis 00A10777-A001 Interface Module

00XR2503-C121 25“ 00EMF801-A001, A002 Main Chassis

00TR2503-C121 25“ 00EMF801-A001 Main Chassis

00HD2511-C121 25“ 00EMF801-A001 Main Chassis

00XS2556-C121 25“ 00EMF806-A001, A002 Main Chassis

00TS2556-C121 25“ 00EMF806-A001, A002 Main Chassis

0025TS56-C121 25“ 00EMF806-A001 Main Chassis

00TR2519-C121 25“ 00EMF803-A001 Main Chassis

0025TR19-C121 25“ 00EMF803-A001 Main Chassis

00TS2546-C121 25“ 00EMF804-A001, A002 Main Chassis

00HD2530-C121 25“ 00EMF804-A001 Main Chassis

00OCC927-C101 27“ 00EMF893 A001, A102 Main Chassis 00A10777-A001 Interface Module

00TS2575-C121 25“ 00EMF807-A001, A002 Main Chassis

00TS2774-C101 27“ 00EMF833-A101, A102 Main Chassis

00TS2774-C121 27“ 00EMF833-A102 Main Chassis

00TS2746-C101 27“ 00EMF830-A101, A102 Main Chassis

00TS2746-C121 27“

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00EMF830-A102 Main Chassis

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00HD2720-C101 27“ 00EMF830-A101 Main Chassis or 00EMF831-A102

00XS2757-C101 27“ 00EMF832-A101, A102 Main Chassis

00TS2757-C101 27“ 00EMF832-A101 Main Chassis

0027TS57-C101 27“ 00EMF832-A101, A102 Main Chassis

0027TS57-C121 27” 00EMF832-A102 Main Chassis

00TS3256-C101 32” 00EMF880-A102 Main Chassis

00TS3256-C121 32” 00EMF880-A002 Main Chassis

25” PHILIPS MODELS

0025PT10-C121 25” 00EMF803-A002 Main Chassis

0025PT15-C121 25” 00EMF806 A002 Main Chassis

PHILIPS – MAGNAVOX CARD SETS

00PC9225-C121 25“ 00EMF891-A001, A102 Main Chassis 00A10777-A001 Interface Module

00TC9225-C121 25“ 00EMF891-A001, A002 Main Chassis 00A10777-A001 Interface Module

PHILIPS - LATIN AMERICA

0026LL59-1121 25“ 00EMF821-A001 Main Chassis

PHILIPS - LATIN AMERICA - AMV

0026LW59-3221 25“ 00EMF823-A001 Main Chassis

0029LL69-1121 27“ 00EMF851-A001 Main Chassis

PHILIPS LATIN AMERICA - 110V

0026LL59-0121 25“ 00EMF820-A001, A002 Main Chassis

0026LW59-2221 25“ 00EMF822-A001, A002 Main Chassis

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0029LL69-0121 27“ 00EMF850-A001, A002 Main Chassis

PHILIPS – INDUSTRIAL TELEVISION - SMARTPORT

00LL9125-C121 25” 00EMF899-A002 Main Chassis

00TL9125-C121 25“ 00EMF890-A001, A002 Main Chassis

00PL9125-C121 25“ 00EMF890-A001, A002 Main Chassis

00TL9127-C101 27“ 00EMF892-A101, A102 Main Chassis

00CH1927-C101 27” 00EMF893-A102 Main Chassis 00A10680-B002 Channel One Card 00A10777-A001 Interface Module

00PA9027-C101 27” 00EMF894 A102 Main Chassis 00AVJ250 A001 Pro video Card Assembly 00A10757 A001 L9 Audio Jack Panel 00A10778 A001 L9 ITV Front A-V 00A10791 A001 Comb Filter Panel 00A10808 A001 Pro Plus Interface

00PL9127-C101 27“ 00EMF892-A101, A102 Main Chassis

00PPC927-C101 27” 00EMF894 A102 Main Chassis 00A10791 A001 Comb Filter Panel 00A10757 A001 L9 Audio Jack Panel 00A10778 A001 L9 ITV Front A/V 00A10808 A001 Pro Plus Interface

00SCN927-C101 27” 00EMF894 A102 Main Chassis 00A10757 A001 L9 Audio Jack Panel 00A10777 A001 Interface Module 00A10778 A001 L9 ITV Front A/V 00A10791 A001 Comb Filter Panel

00PA9032-C101 32” 00EMF895 A102 Main Chassis 00AVJ250 A001 Pro video Card Assembly 00A10757 A001 L9 Audio Jack Panel 00A10791 A001 Comb Filter Panel 00A10808 A001 Pro Plus Interface

00PPC932-C101 32” Philips 00EMF895 A102 Main Chassis 00A10757 A001 L9 Audio Jack Panel

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00A10791 A001 Comb Filter Panel 00A10808 A001 Pro Plus Interface

Remote

Replacement

RC0702/04

3139 148

54201

RCO705/00

3139 228

80571

RC0705

-------------

RC282901/01

3139 228

81441

Philips

RCL9UB RCL9UB RCU82C

RC282901/04

3139 228

81451

PH/MX

RC2524/04

3139 228

81591

RC2528/04

3139 228

82051

RCU82D

-------------

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00SCN932C101 32” Philips 00EMF895 A102 Main Chassis 00A10757 A001 L9 Audio Jack Panel 00A10777 A001 Interface Module 00A10791 A001 Comb Filter Panel

PHILIPS INDUSTRIAL TELEVISION - CARD SET

00PC9227-C101 27“ Philips 00EMF893-A101, A102 Main Chassis 00A10777-A001 Interface Module

SC2932C121 32" Philips 313501700770 Scan Card 00A10808 A001 Pro Plus Interface 00A10757 A001 Audio Jack Panel 00AVJ222 A001 Scan Converter Card 00A10654 A001 Scan Converter Jack Panel 00EMF895 A002 Main Chassis 00A10791 A001 Comb Filter Panel

Remote

Replacement

RC0702/04

3139 148

54201

RCO705/00

3139 228

80571

RC0705

-------------

RC282901/01

3139 228

81441

Philips

RCL9UB RCL9UB RCU82C

RC282901/04

3139 228

81451

PH/MX

RC2524/04

3139 228

81591

RC2528/04

3139 228

82051

RCU82D

-------------

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MODEL TO REMOTE CROSS-REFERENCE

Remote

Replacement

Remote Drawing RC0702 00TR2503-C121 X 0025TR19-C121 X 0025TS56-C121 X 0026LL59-0121 X 0026LL59-1121 X 0026LW59-2221 X 0026LW59-3221 X 0027TS57-C101 X 0029LL69-0121 X 0029LL69-1121 X 00HD2511-C121 X 00HD2530-C121 X 00HD2720-C101 X 00TL9125-C121 X 00TL9127-C101 X 00TR2519-C121 X 00TS2546-C121 X 00TS2556-C121 X 00TS2575-C121 X 00TS2746-C101 X 00TS2757-C101 X 00TS2774-C101 X 00XR2503-C121 X 00XS2556-C121 X 00XS2757-C101 X 00OCC925-C121 00OCC927-C101 00PC9225-C121 00PC9227-C101 00PL9125-C121 00PL9127-C101 00TC9225-C121

RC0702/04

3139 148

54201

No Remote No Remote No Remote No Remote No Remote No Remote No Remote

RCO705/00

3139 228

80571

RC0705

-------------

RC282901/01

3139 228

81441

Philips

RCL9UB RCL9UB RCU82C

RC282901/04

3139 228

81451

PH/MX

RC2524/04

3139 228

81591

RC2528/04

3139 228

82051

RCU82D

-------------

(Display Quick-Use Guide for RC0702 Transmitter)

(Display Quick-Use Guide for RCU82C Transmitter)

(Display Quick-Use Guide for RCL9UB Transmitter)

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MODEL TO JACKPANEL CROSS-REFERENCE

(Display JP9000 Jack Panel) (Display JP9103 Jack Panel) (Display JP9106 Jack Panel)

Models Jack Panels

JP9000 JP9103 JP9106

00TR2503-C121 0025TR19-C121 X 0025TS56-C121 X 0026LL59-0121 X 0026LL59-1121 X 0026LW59-2221 X 0026LW59-3221 X 0027TS57-C101 X 0029LL69-0121 X 0029LL69-1121 X 00HD2511-C121 X 00HD2530-C121 X 00HD2720-C101 X 00TR2503-C121 X 00TR2519-C121 X 00TS2546-C121 X 00TS2556-C121 X 00TS2575-C121 X 00TS2746-C101 X 00TS2757-C101 X 00TS2774-C101 X 00XR2503-C121 X 00XS2556-C121 X 00XS2757-C101 X 00TL9125-C121 00TL9127-C101 00OCC925-C121 00OCC927-C101 00PC9225-C121 00PC9227-C101 00PL9125-C121 00PL9127-C101

00TC9225-C121

No Jack Panel No Jack Panel No Jack Panel No Jack Panel No Jack Panel No Jack Panel No Jack Panel No Jack Panel No Jack Panel

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GLOSSARY OF TERMS, ACRONYMS, AND ABBREVIATIONS

2CS Two Channel Stereo AFC Automatic Frequency Control AFT Automatic Fine Tuning AP Asia Pacific ATS Automatic Tuning System AV External Audio/Video AVL Automatic Volume Level control BTSC Broadcast Television Standard Committee (TV Stereo) CBA Circuit Board Assembly (PCB) CC Closed Captioning CSM Customer Service Mode CVBS Color Video Blanking Sync DNR Dynamic Noise Reduction EEPROM Electrical Erasable Programmable Read-Only Memory Error Buffer Register that keeps track of errors that occur and stores error codes Error Code A numerical value used to indicate a failure in the television EU Europe EXT External audio/video input FM Frequency Modulation I²C Inter IC bus, 2-wire bi-directional (SCL/SDA) ID Identification IDENT Horizontal coincidence signal, transmitter identification IF Intermediate Frequency IN ITT sound IC with NICAM function IT ITT sound IC without NICAM function LATAM Latin America LED Light Emitting Diode Local Keyboard The buttons (usually volume up, volume down, channel up, and channel down)

located on the front of the television set

MA Mono All; single mono carrier receiver NR Noise Reduction NTSC National Television Systems Committee (video) NVM Non Volatile Memory OB Option Byte (Feature Byte) OSD On Screen Display PCB Printed Circuit Board (CBA) PIP Picture In Picture PLL Phase Locked Loop PP Personal Preference RAM Random Access Memory RC Remote Control RC-5 Remote Control system 5 RGB Red Green Blue ROM Read Only Memory SAM Service Alignment Mode SAP Second Audio Program SCL Serial Clock SDA Serial Data SDM Service Default Mode SVHS Super Video Home System Top Level Menu This refers to the main menu (as opposed to sub menus) in SAM V-Chip Violence-Chip

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VCR Video Cassette Recorder Y/C Luminance/Chrominance (video)

SAFETY INSTRUCTIONS FOR REPAIRS

1. Safety regulations require that during a repair:

• the set should be connected to the mains via an isolating transformer

• safety components, indicated by the symbol s , should be replaced by components

identical to the original ones

• when replacing the CRT, safety goggles must be worn

2. Safety regulations require that after a repair the set must be returned in its original condition. In particular, attention should be paid to the following points:

Note:

This resoldering is advised to prevent bad connections due to metal fatigue in solder joints, and is therefore only necessary for television sets older than 2 years.

• As a strict precaution, we advise you to resolder the solder joints through which the

horizontal deflection current is flowing, in particular:

- All pins of the line output transformer (LOT)

- flyback capacitor(s)

- S-correction capacitor(s)

- line output transistor

- pins of the connector with wires to the deflection coil

- other components through which the deflection current flows

• Resolder points are marked by a white circle on the bottom of the CBA.

• The wire trees and EHT cable should be routed correctly and fixed with the

mounted cable clamps.

• The insulation of the mains lead should be checked for external damage.

• The mains lead strain relief should be checked for its function in order to avoid

touching the CRT, hot components or heat sinks.

• The electrical DC resistance between the mains plug and the secondary side

should be checked (only for sets which have a mains isolated power supply).

This check can be done as follows:

- unplug the mains cord and connect a wire between the two pins of the mains plug

- set the mains switch to the on position (keep the mains cord unplugged!)

- measure the resistance value between the pins of the mains plug and the

metal shielding of the tuner or the aerial connection on the set. The reading should be between 4.5 Megohm and 12 Megohm.

- switch off the TV and remove the wire between the two pins of the mains plug

• The cabinet should be checked for defects to avoid touching of any inner parts by the customer.

JP9000 JP9103 JP9106 JP9202 JP9204 JP9403 JP9406 JP9410 JP9411 JP9519 JP9523

RF Input/

Antenna

Jacks

Quantity

Video

Input

75 ohm 75 ohm 75 ohm 75 ohm 75 ohm 75 ohm 75 ohm 75 ohm 75 ohm 2 x 75

ohm

0 3 6 2 4 3 7 10 11 19 23

1 1 1 1 1 1 2 2 3 3

2 x 75

ohm

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JACK PANEL DEFINITIONS

JP9000 JP9103 JP9106 JP9202 JP9204 JP9403 JP9406 JP9410 JP9411 JP9519 JP9523

RF Input/

Antenna

Jacks

Quantity

Video

Input

Audio

Input

SVHS

Input

ead-phon Front Front Front Front Side Side Surround

Sound

Speaker

Video Out 1 1 1 1 1 1

Audio

Output

Smart

Plug

CH. 1

Demod.

Theft

Control

Pillow

Control

Guide +

Gold YUV

Comp. In

"* Only one set of audio output jacks, menu selectable, switchable between fixed and variable output"

75 ohm 75 ohm 75 ohm 75 ohm 75 ohm 75 ohm 75 ohm 75 ohm 75 ohm 2 x 75

0 3 6 2 4 3 7 10 11 19 23

1 1 1 1 1 1 2 2 3 3

L-R L-R 1 L-R 1 L-R 2 (L-R) 2 (L-R) "3(L-R)

Out

L-R

(Fixed)

L-R

(Fixed)

L-R

(Fixed)

1 2

L-R

(Fixed)

ohm

2-Rear, 1-Side"

(1-Rear/

1-Side)

(1-Rear/

L-R* L-R*

1 1 3 3

2 x 75

ohm

"3(L-R) 2-Rear, 1-Side"

1-Side)

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MAIN CHASSIS SCHEMATIC NOTES:

UNLESS OTHERWISE SPECIFIED:

1. ALL VOLTAGES AND WAVEFORMS WERE TAKEN UNDER THE FOLLOWING CONDITIONS:

- LINE VOLTAGE MAINTAINED AT 120VAC, 60Hz VIA AN ISOLATION

TRANSFORMER.

- SET IN SDM (SERVICE DISPLAY MODE). To enter SDM, press 0-6-2-5-9-6-Menu

on the remote control.

- ALL VOLTAGES WERE TAKEN FROM MODEL TS2774C101.

2. ALL WAVEFORMS WERE TAKEN WITH AN NTSC SIGNAL GENERATOR DELIVERING 10mVp-p AT THE ANTENNA INPUT.

3. ON VOLTAGE CHARTS:

- VOLTAGES IN THE "Signal" COLUMN WERE TAKEN WITH AN NTSC SIGNAL

GENERATOR DELIVERING 10mVp-p AT THE ANTENNA INPUT.

- VOLTAGES IN THE "No Signal" COLUMN WERE TAKEN WITH NO SIGNAL

APPLIED.

- VOLTAGES IN THE "Standby" COLUMN WERE TAKEN WITH THE SET IN

STANDBY MODE (Power supplied to the chassis, set turned off).

4. ALL VOLTAGES ARE POSITIVE DC WITH RESPECT TO GROUND IN THAT SECTION OF THE CHASSIS, AND MAY VARY DUE TO NORMAL PRODUCTION TOLERANCES.

5. COMPONENT AND SPECIAL SYMBOLS: * INDICATES A COMPONENT WHICH WILL VARY DEPENDING ON SCREEN

SIZE, PRODUCTION DATES, AND OPTION FEATURES INSTALLED. PLEASE SEE THE REPLACEMENT PARTS LIST FOR SPECIFIC PART INFORMATION.

• INDICATES A COMPONENT IS AN SMD ”CHIP“ TYPE COMPONENT, AND AS

SUCH WILL BE LOCATED ON THE BOTTOM Side OF THE CBA.

6. A HIGH VOLTAGE OSCILLOSCOPE PROBE (100:1) IS NEEDED TO MEASURE THE WAVEFORM AT THE HORIZONTAL OUTPUT TRANSISTOR (PART # 7620).

7. SPARK GAPS SHOWN ON THE CRT SCHEMATIC ARE INTERNAL TO THE CRT SOCKET.

8. THE NUMBERS 1a THROUGH 38b, SHOWN IN ENCLOSED BOXES, CORRESPOND TO THE WAVEFORM PHOTOGRAPHS.

9. FOR VOLTAGE, WATTAGE, AND TOLERANCE RATINGS OF RESISTORS AND CAPACITORS, PLEASE SEE THE ELECTRICAL REPLACEMENT PARTS LIST.

10. INDICATES PCE REPLACEMENT PART NUMBER ONLY.

MAIN CHASSIS WAVEFORM NOTES:

UNLESS OTHERWISE SPECIFIED: ALL WAVEFORMS WERE TAKEN UNDER THE FOLLOWING CONDITIONS:

- LINE VOLTAGE MAINTAINED AT 120VAC, 60Hz VIA AN ISOLATION

TRANSFORMER.

- SET IN SDM (SERVICE DISPLAY MODE). TO ENTER SDM, PRESS

0-6-2-5-9-6-MENU ON THE REMOTE CONTROL.

- ALL WAVEFORMS WERE TAKEN FROM MODEL TS2774-C101.

- ALL WAVEFORMS WERE TAKEN WITH AN NTSC SIGNAL GENERATOR

DELIVERING 10mVp-p AT THE ANTENNA INPUT.

- SWEEP TIME/CM SETTINGS ARE SHOWN WITH THE FIGURES IN THE

CALIBRATED POSITION.

- THE ACTUAL SWEEP TIMES AND VOLTAGES PRESENT ARE SHOWN

WHEREVER POSSIBLE.

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- COMPOSITE VIDEO SIGNALS ARE SHOWN WITHOUT SWEEP TIME AND

VOLTAGES PRESENT BECAUSE THESE SIGNALS HAVE VARIABLE SWEEP TIMES AND VOLTAGES.

- A HIGH VOLTAGE OSCILLOSCOPE PROBE (100:1) IS NEEDED TO MEASURE

THE WAVEFORM AT THE HORIZONTAL OUTPUT TRANSISTOR (PART #

7460).

- THE DESIGNATORS A1a THROUGH V6c, SHOWN IN ENCLOSED BOXES,

CORRESPOND TO THE WAVEFORM PHOTOGRAPHS.

AUDIO WAVEFORM NOTES:

THESE NOTES APPLY ONLY TO THE AUDIO WAVEFORMS (A1a THROUGH A3d). AUDIO WAVEFORMS WERE TAKEN UNDER THE FOLLOWING CONDITIONS:

- ALL WAVEFORMS WERE TAKEN WITH A LEADER LMS-238 SOUND

GENERATOR CONNECTED AT THE ANTENNA INPUT, WITH THE FOLLOWING SETTINGS:

- INT FREQUENCY SET TO 1kHz

- STEREO (L+R), PILOT ON

- VIF/RF OUTPUT AT CHANNEL 3

- ALL WAVEFORMS WERE TAKEN FROM MODEL TS2774C101.

- TELEVISION SET TO CHANNEL 3 IN NORMAL MODE.

- DO NOT MUTE THE SET.

- SET THE TELEVISION VOLUME AT 40.

- THE SPEAKERS MAY BE DISCONNECTED AT CONNECTOR #0234 (BOARD

LOCATION B-1) IF THE AUDIO OUTPUT CAUSES A DISTRACTION TO THE SERVICER.

F8 CHASSIS FEATURE LISTING

USA/CANADIAN CHASSIS LISTINGS LATIN AMERICAN CHASSIS LISTINGS INDUSTRIAL CHASSIS LISTINGS

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Page 18

(Display Quick-Use Guide for RC0702 Transmitter)

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(Display Quick-Use Guide for RCU82C Transmitter)

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(Display Quick-Use Guide for RCL9UB Transmitter)

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Page 21

(Display JP9000 Jack Panel)

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Page 22

(Display JP9103 Jack Panel)

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Page 23

(Display JP9106 Jack Panel)

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Philips Consumer Electronics

Technical Service Data

Service Solutions Group Technical Publications Dept. P.O. Box 555 401 East Old City Johnson Hwy. Jefferson City, TN 37760

Manual 7583

Model no.: 25PT10C121 Chassis no.: 25F8 First Publish: 10-9-2000 Rev. Date: 3-21-2001 Print Date: 4/12/2003

Training Information

REFER TO SAFETY GUIDELINES

CAUTION: USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING

Visit our World Wide Web Site at http://www.magnavox.com

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Page 25

F8 CHASSIS INTRODUCTION

processor IC and the audio output IC via the I2C bus. The memory IC retains the settings for favorite stations, customer-preferred settings, and service/factory data.

TRANSFORMER WHEN SERVICING THIS CHASSIS FOR YOUR SAFETY.

SIGNAL FLOW DESCRIPTION

(Display Signal Flow Block Diagram)

The incoming RF signal is applied to the U/V tuner where the 45.75 MHz IF signal is developed and amplified. The IF signal then exits the tuner from pin11to pass through the SAW filter, (1003). The shaped signal is then applied to IC 7250, the IF processor. The automatic gain control (AGC) is performed in IC 7250 and applied to the U/V tuner at pin1. An automatic fine tuning signal (AFT) is also

generated in the IC and then routed to the tuning system via the I2C bus, to provide frequency correction as needed.

The IF signal exits IC 7250 at pin 6, the audio and video signals are separated and each processed accordingly. The sound IF signal enters IC 7250 at pin 1, while the video re-enters at pin 13. The audio signal passes through the pre-amp, volume control and volume limiting circuits before application to the final audio stages.

The video signal entering at pin 13, is separated into its luminance and chrominance components, and exits at pins 21, 20, and 19 as R, G, and B respectively. The R G B signals are sent to the CRT DRIVE board, amplified and applied to the CRT pins as drive. Drive and cutoff controls for the CRT are also located on this board.

Brightness, Picture, Sharpness, Color and Tint control voltages are varied by the microprocessor, IC 7600 through individual control lines. IC 7600 also controls selected inputs, as selected by the consumer. Video and audio muting are an internal function of IC 7250. Automatic volume limiting also takes place inside this IC.

Vertical and Horizontal drive signals are also developed inside IC 7250. Vertical drive exits the IC from pin 47, while Horizontal drive exits at pin 40. These signals are a product of a Voltage Controlled Oscillator Circuit (VCO) and divider network located inside the chip. Vertical drive is applied to pin 1 of IC 7401, amplified, shaped, and output from pin 5 where it is applied to the vertical winding of the yoke. A feedback signal is returned to pin 46 of IC 7250. The vertical sync pulse is also applied to the

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Page 26

microprocessor, IC 7600, to pin 37 for On-Screen Display and Closed-Captioning synchronization. The horizontal drive signal exits IC 7250 from pin 40 and is applied to Q 7461, the horizontal driver transistor. The signal is amplified and coupled to the base circuit of Q 7460, the horizontal output transistor. The H.O.T. drives the Integrated Flyback Transformer, which provides high voltage, screen voltage, focus, G-2, and filament voltages for the CRT. A scan-derived power supply is also provided by the IFT. It supplies -13 volts, +13 volts, +50 volts, a secondary +5 volt supply, and a +200 volt source for video drive. The secondary of the IFT is monitored by safety circuits and is tied back to the microprocessor and signal-processing IC’s to turn the set off if a problem should occur.

POWER SUPPLY DESCRIPTION

(Display Power Supply Block Diagram)

The F8 chassis family uses a free-running switch-mode power supply with a single controller IC. As AC power is applied to the set, approximately 160volts DC is developed by the bridge rectifiers and fed to the primary winding of the power transformer, then to the FET switch. The start voltage for the power supply is taken from the hot leg of the AC input. This voltage goes to controller IC 7520. A separate operating voltage is developed from the power transformer, rectified, and applied to IC 7520. The power supply is on all the time; there is no standby mode. The set is turned on and off by the microprocessor switching the +8 volt regulator on and off. The +8 volt is the supply voltage for the signal processor. IC7520 is regulated by means of a feedback circuit, monitoring the +11 volt secondary line. Any voltage variations are reflected back to the controller IC 7520 through an Opto-Coupler IC and change the operating frequency of the power supply as needed. REMEMBER TO USE AN ISOLATION

TRANSFORMER WHEN SERVICING THIS CHASSIS.

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(Display Signal Flow Block Diagram)

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(Display Power Supply Block Diagram)

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Philips Consumer Electronics

Technical Service Data

Service Solutions Group Technical Publications Dept. P.O. Box 555 401 East Old City Johnson Hwy. Jefferson City, TN 37760

Manual 7583

Model no.: 25PT10C121 Chassis no.: 25F8 First Publish: 10-9-2000 Rev. Date: 3-21-2001 Print Date: 4/12/2003

Mechanical Assembly

REFER TO SAFETY GUIDELINES

CAUTION: USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING

Visit our World Wide Web Site at http://www.magnavox.com

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DISASSEMBLY INTRODUCTIONS

(Display Cabinet Back Removal Illustration)

(Display Main Chassis Removal Illustration)

(Display Service Position Illustration)

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(Display Cabinet Back Removal Illustration)

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(Display Main Chassis Removal Illustration)

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(Display Service Position Illustration)

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Philips Consumer Electronics

Technical Service Data

Service Solutions Group Technical Publications Dept. P.O. Box 555 401 East Old City Johnson Hwy. Jefferson City, TN 37760

Manual 7583

Model no.: 25PT10C121 Chassis no.: 25F8 First Publish: 10-9-2000 Rev. Date: 3-21-2001 Print Date: 4/12/2003

Mechanical Diagrams

REFER TO SAFETY GUIDELINES

CAUTION: USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING

Visit our World Wide Web Site at http://www.magnavox.com

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MAIN CABINET EXPLODED VIEW

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Philips Consumer Electronics

Technical Service Data

Service Solutions Group Technical Publications Dept. P.O. Box 555 401 East Old City Johnson Hwy. Jefferson City, TN 37760

Manual 7583

Model no.: 25PT10C121 Chassis no.: 25F8 First Publish: 10-9-2000 Rev. Date: 3-21-2001 Print Date: 4/12/2003

Electrical Adjustments

REFER TO SAFETY GUIDELINES

CAUTION: USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING

Visit our World Wide Web Site at http://www.magnavox.com

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SERVICE ADJUSTMENTS Required Tools For Servicing:

Isolation Transformer Multimeter Oscilloscope High Voltage (100:1) Oscilloscope Probe Sencore VG91 Universal Video Generator

Service Adjustment Notes:

Unless Otherwise Specified:

1. All service adjustments are ”hot“ voltagewise. For maximum safety, ensure the use of properly insulated tools.

2. Refer to the F8 Main Chassis Printed Circuit Board for location of test points and adjustable components.

3. Grid Locations (Ex.: D-2) next to the reference numbers for components refer to the Main Chassis Printed Circuit Board.

Caution: The F8 chassis incorporates a ”hot“ ground system. Always use a

separate isolation transformer when applying power to the exposed chassis.

Focus Adjustment

1. Tune the set to a local or cable station.

2. Adjust the Focus Control (located on the upper part of the flyback transformer) for best picture details at high light conditions.

Degaussing the Television

1. Position the television so that the screen faces the direction it will be facing when in use.

2. Ensure the set is turned off.

3. Move a degaussing coil in a circular motion slowly around the sides and front of the set.

4. Withdraw the degaussing coil at least six feet from the television before disconnecting it from its power source.

Service Modes:

Introduction

1. There are three service modes used in the F8 chassis. They are:

a. SDM - Service Default Mode b. SAM - Service Alignment Mode c. CSM - Customer Service Mode

2. The Service Default Mode (SDM) is a technical aid for the service technician. It is used for setting of options, reading error codes, and erasing error codes. This mode displays the Run Timer, Software Version, and current option settings. Service Default Mode (SDM) also establishes a fixed, repeatable setting of controls to allow measurements to be made. On screen display is kept at a minimum to reduce the cluttering of waveforms with unwanted information.

3. The Service Alignment Mode (SAM) is used to make tuning adjustments, align the white tone, adjust the picture geometry, and make sound adjustments.

4. The Customer Service Mode shows error codes and information on the TV operation settings. The servicer can instruct the customer to enter CSM by

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telephone and read off the information displayed. This helps the servicer to diagnose problems and failures in the TV set before making a service call.

5. When in a service mode, "SDM" (for Service Default Mode) or ”SAM“ (for Service Alignment Mode) or ”CSM“ (for Customer Service Mode) will be displayed (in green) in the top right corner of the screen. All other On Screen Display (except highlighted items in SDM or SAM) will be in red.

6. It will be memorized in the EEPROM that the TV set is in SDM or SAM. This is necessary because the TV must show up in SDM or SAM again after an AC power interrupt.

7. When the television is in SAM or SDM, all normal features (such as volume control and direct channel access) are available.

EEPROM Replacement or Defective EEPROM

After replacing a EEPROM (or with a defective/no EEPROM) default settings will be used that enable the set to start up and that allow access to the Service Default Mode and Service Alignment Mode.

Service unfriendly modes

In the service modes, a number of modes/features are ignored since they interfere with diagnosing or repairing a set. These are ”service unfriendly modes.“ ”Ignoring“ means that the event that is triggered is not executed; the setting remains unchanged (Example: Timer OFF: 8:00 PM; the set will not switch OFF in service mode at 8:00PM, but the setting will remain). The service unfriendly modes are:

• (Sleep) timer

• Blue mute

• Auto switch off (when there is no video signal identified)

• Hotel or hospital mode

• Smart lock or blocking by V-chip

• Skipping and/or blanking of ”Not Favorite“ channels

• Automatic storing of Personal Preset settings

• Automatic user menu time-out (menu switches back or OFF automatically)

Service Default Mode (SDM)

1. The Service Default Mode (SDM), sets the option codes and bytes of the set, and displays the error codes (the Power LED begins blinking procedure for error code display, if errors are detected). SDM also overrides software protections. The Service Default Mode (SDM) must be used when taking voltages and waveforms.

2. To enter the Service Default Mode, press the following key sequence on the remote control transmitter:

0-6-2-5-9-6-Menu Do not allow the display to time out between entries while keying the sequence.

SDM can also be entered by pressing the Channel Down and Volume Down keys

on the local keyboard simultaneously while in SAM mode.

When Service Default Mode is entered, the text "SDM" will be displayed in the

upper right corner of the screen.

3. When Service Default Mode is entered, the Power LED will begin blinking to display any detected error codes, the set automatically tunes to Channel 3 (61.25 MHz), and service unfriendly modes are disabled. All customer controls are set to predetermined values.

4. When the unit is operating in Service Default Mode, all normal on-screen displays are suppressed and replaced by a special service display. A sample SDM display is shown below.

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5. To select an option code or option byte in SDM, use the Menu Up or Menu Down keys on the remote control.

6. To change the value of an option code, use the Menu Left or Menu Right keys.

7. To change the value of an option byte, enter the new value using the numeric keys on the remote control.

8. Press the Status button on the remote control to toggle the OSD (except ”SDM“) ON and OFF to prevent the OSD from interfering with measurements and oscilloscope waveforms.

9. Press the Menu button on the remote control while in SDM to switch the software to a Virtual Customer Mode; the text "SDM" will still be displayed in the upper right corner of the screen. In this mode, all customer menu adjustments to the set can be made. From the Virtual Customer Mode, press the Menu button to return to the SDM display.

10. To exit the Service Default Mode and erase the error codes, turn the unit off with the Power button on the remote control then unplug the AC cord.

11. To exit the Service Default Mode and save the error codes, unplug the AC cord to turn off the set. When the set is turned on again, the Service Default Mode will still be active.

Explanation of Display: Run Timer

The run timer counts the normal operation hours, not the standby hours. The actual value of the run timer is displayed in SDM and CSM. The run timer displays hours in hexadecimal format. This display will increment based on the amount of time the set has been on. The timer will also be incremented one hour each time the set is turned on.

Software Identification, Cluster, and Version

The software identification, cluster, and version will be shown in the service main menu display. These numbers consist of the last part of the customer identification printed on the IC package; the screen will show ”AAABBC-X.Y“. (Example: L90US11 1.0)

− AAA is the engineering project name (Ex: L90 = L9.0).

− BB is a function specification indicating specific functionality or a region (Ex: US).

Processors with the same engineering project name and function name are interchangeable, except for the languages they support.

− C is the language cluster number within the ”BB“ software version

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(Ex: 11 = English/Spanish/French)

− X is the main version number (Ex: 1)

− Y is the sub version number (Ex: 0)

− the main version number is updated with a major change of specification

(incompatible with the previous software version)

− the sub version number is updated with a minor change (backwards compatible

with the previous versions)

− if the main version number changes, the new version number is written in the

EEPROM

− if the main version number changes, the default settings are loaded

− if the sub version number changes, the new version number is written in the

EEPROM

− if the EEPROM is fresh, the software identification, version and cluster will be

written to EEPROM

− Note: a new micro controller is considered to be compatible if it works instead of

the old software and the functionality is not significantly changed.

Error Buffer

Error codes are required to indicate failures in the television. For intermittent complaints, always check the error buffer. A unique error code is available for:

• activated protection (error codes 1, 2, and 3)

• failing I2C device

general I2C error

•

• RAM failure (e.g. internal RAM of microprocessor (IC 7600)

Other error codes are:

• Signal processor (IC 7250) start-up error

• EEPROM check-sum error

The last five errors, remembered in the EEPROM, are shown in the service menu. This is called the error buffer. The error that is found last is displayed on the left, except when protection (1 to 3) is active. Errors 1, 2, and 3 are often shown at the right of the error buffer display whenever they are detected.

Example 1:

Suppose the display shows: 8 – 11 – 2– 0 – 0 With 2 displayed at the right of the error buffer, high beam current protection is active.

Example 2:

Suppose the display shows: 11 – 4 – 5– 3 – 0 With 3 displayed at the right of the error buffer, vertical protection is active.

The following error codes have been defined:

Error Code Table:

0 = No error 1 = X-Ray / overvoltage protection active 2 = High beam current (BCI) protection active 3 = Vertical protection active 4 = I²C error while communicating with the sound processor (IC 7833) 5 = Signal processor (IC 7250) start-up error 6 = I²C error while communicating with the signal processor IC (IC 7250) 7 = General I²C error * 8 = Internal RAM error micro controller 9 = EEPROM Configuration error (Checksum error)

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10 = I²C error, EEPROM error 11 = I²C error, PLL tuner

Note: I²C = (SCL/SDA) * General I²C error means: no I²C device is responding to the particular I²C

bus. Possible causes: SCL short circuit to GND, SDA short circuit to GND, SCL short circuit to SDA, SDA open circuit (at IC 7600), SCL open circuit (at IC 7600)

Reading Error Codes

Error codes are displayed in the following ways:

1. By SDM display or CSM display

2. By blinking Power LED

1. If the on screen display is working, enter SDM or CSM and read the error buffer display.

2. If the on screen display is not working, do the following: a. Remove AC power b. Use a jumper to connect pin M24 to pin M25 at IC 7601 (D-3) c. Apply AC power; read the error codes (see LED Sequence List below) d. If there is no LED indication, take the following steps as needed: Power on Press 0–6–2–5–9–6–Menu on the remote control Note: Some indications take 30 seconds or longer to appear on the LED.

3. LED Sequence List: a. Wait for long LED on (1.5 seconds) b. Count the following on flashes (individual errors are separated by 1.5

seconds LED off)

Example:

4. Displayed error codes are saved by removing the AC power. Displayed error codes are erased by pressing the power button on the remote control or local keyboard.

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Option Code and Status Table

The following options in SDM can be identified:

Note: All options may not be available in some sets.

OPTION OP VALUES

System SY SS (This option is not used in US models) Option Byte 1 Option Byte 2 Option Byte 3 Option Byte 4 Option Byte 5 Option Byte 6 Option Byte 7

Slider Bar Value Display DP OFF/ON Animated Menu AM OFF/ON Hospital Mode HS OFF/ON Hotel Mode HT OFF/ON Demo Mode DM OFF/ON Games Mode GM OFF/ON Clock (Volatile) CK OFF/ON Child Lock CL OFF/ON V-Chip VC OFF/ON V-Chip Block Unrated VU OFF/ON Block No Rating (V-Chip) VN OFF/ON Smart Sound SS OFF/ON Smart Picture SP OFF/ON Remote Control Type RC OFF = RC0702/04 remote control / ON =

Channel Select Time Window TW OFF = 2-second time window / ON = Surf SF OFF/ON

Video Mute (Channel Change) VM OFF/ON Tuner Type TN OFF = Philips tuner / ON= ALPS tuner Fine Tuning FT OFF/ON AV1 XT OFF/ON AV2 2X OFF/ON Auto Cable Detect CD OFF/ON Blue Mute BM OFF/ON No Ident (Auto Standby) NI OFF/ON Noise Reduction NR OFF/ON Contrast Plus CP OFF/ON Color Temperature CT OFF/ON East-West Functions EW OFF/ON (This option is not used in US models) Video Processor Standby BS OFF/ON Video Processor Auto Startup AS OFF/ON Bass/Treble Control/Boost BT OFF/ON Incredible Surround IS OFF/ON Volume Limiter VL OFF/ON Ultra Bass UB OFF/ON Automatic Volume Leveller

(AVL) SAP - Mono/Stereo DU OFF/ON Audio Out (Fixed/Variable) AO OFF/ON Sound Type ST BG/I/DK/M (Should remain on M) Sound Board SB DB = DBX/SAP (BTSC)

OB1

Option Bytes 1 through 7 are used to set 8 options

OB2

simultaneously with one byte (value can be keyed in

OB3

with numerical buttons on remote control when the

OB4

byte is highlighted).

OB5

Values = 0 – 255

OB6

See the Chassis Feature Listing to see the values for

OB7

Option Bytes 1 through 7. These values can be used to set the option package for a particular model.

All other remote controls 5-second time window

LV OFF/ON

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Sound Board SB DB = DBX/SAP (BTSC)

EC = BTSC stereo (No SAP) MA = Mono All MS = Bi Sonic (Mono by tuner, stereo by A/V jacks)

Option SY : System

Function: Set the multi system hardware configuration Values: SS (This option is not used in US models)

OB 1 – OB 7 : Option Byte 1 – Option Byte 7

Function: Set 8 options simultaneously with one byte

(value can be keyed in with numerical buttons on remote control)

Values: 0 – 255

Option DP : Slider Bar Value Display

Function: Enable/disable slider bar value display in customer menu Values: OFF = Disable slider bar value display ON = Enable slider bar value display

Option AM : Animated Menu

Function: Enable/disable animated menu Values: OFF = Disable animated menu display ON = Enable animated menu display

Option HS : Hospital Mode

Function: Enable/disable the possibility to enter hospital mode Values: OFF = Disabled, hospital mode cannot be entered ON = Enabled, hospital mode can be entered

Option HT : Hotel Mode

Function: Enable/disable the possibility to enter hotel mode Values: OFF = Disabled, hotel mode cannot be entered ON = Enabled, hotel mode can be entered

Option DM : Demo Mode

Function: Enable/disable the possibility to enter demo mode Values: OFF = Disabled, demo mode is not active ON = Enabled, demo mode is active

Option GM : Games Mode

Function: Enable/disable games function Values: OFF = Disabled, games command is ignored ON = Enabled, games command is processed

Option CK : Clock (Volatile)

Function: Enable/disable clock function Values: OFF = Disabled, clock menu not available ON = Enabled, clock menu available

Option CL : Child Lock

Function: Enable/disable child lock function Values: OFF = Disabled, child lock menu not available ON = Enabled, child lock menu available

Option VC : V-Chip

Function: Enable/disable v-chip function (customer menu item Smartlock) Values: OFF = Disabled, v-chip menu (customer menu item Smartlock) Not available ON = Enabled, v-chip menu (customer menu item Smartlock) available

Option VU : V-Chip Block Unrated

Function: Enable/disable V-Chip block unrated (in Smartlock menu) Values: OFF = Disabled, V-Chip block unrated (in Smartlock menu) not available ON = Enabled, V-Chip block unrated (in Smartlock menu) available

Option VN : Block No Rating (V-Chip)

Function: Enable/disable block no rating V-Chip (in Smartlock menu)

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available ON = Enabled, block no rating V-Chip (in Smartlock menu) available

Option SS : Smart Sound

Function: Enable/disable smart sound function Values: OFF = Disabled, Smart Sound command is ignored ON = Enabled, Smart Sound command is processed

Option SP : Smart Picture

Function: Enable/disable smart picture function Values: OFF = Disabled, Smart Picture command is ignored ON = Enabled, Smart Picture command is processed

Option RC : Remote Control Type

Function: Choose the type of remote control to be used Values: OFF = RC0702/04 remote control ON = All other remote controls Note: If changed, this option can only be returned to the original setting by option

byte correction.

Option TW : Channel Select Time Window

Function: Select time window for channel selection Values: OFF = 2-second time window for channel selection ON = 5-second time window for channel selection

Option SF : Surf

Function: Enable/disable the possibility to enter surf mode Values: OFF = Disabled, customer menu item Surf not available and A/CH command alternates channels ON = Enabled, customer menu item Surf available and A/CH command surfs or alternates channels

Option VM : Video Mute (Channel Change)

Function: Enable/disable video mute during channel change Values: OFF = Disabled, no video mute during channel change ON = Enabled, video muted during channel change

Option TN : Tuner Type

Function: Choose the tuner type that is configured in the hardware Values: OFF = Philips tuner (A Philips tuner will have the Philips name embossed on the side) ON = ALPS tuner (An ALPS tuner will not have the Philips name embossed on the side)

Option FT : Fine Tuning

Function: Enable/disable fine tuning Values: OFF = Customer menu item fine tuning disabled ON = Customer menu item fine tuning enabled

Option XT : AV1

Function: Enable/disable external input source 1 (Ext 1) Values: OFF = Disabled, external input source 1 (Ext 1) not available ON = Enabled, external input source 1 (Ext 1) available

Option 2X : AV2

Function: Enable/disable external input source 2 (Ext 2) Values: OFF = Disabled, external input source 2 (Ext 2) not available ON = Enabled, external input source 2 (Ext 2) available

Option CD : Auto Cable Detect

Function: Enable/disable automatic detection of Cable/Broadcast during autostore. Values: OFF = Disabled, autostore uses the selected Cable/Broadcast setting ON = Enabled, autostore will detect and set Cable/Broadcast mode

Option BM : Blue Mute

Function: Enable/disable blue mute when no television station signal is present

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Values: OFF = Disabled, no blue mute when no television station signal is present ON = Enabled, blue mute active when no television station signal is present

Option NI : No Ident (Auto Standby)

Function: Enable/disable automatic switch to standby after 10 minutes when no

television station signal is present Values: OFF = Disabled, no automatic switch to standby ON = Enabled, set switches to standby after 10 minutes when no

television station signal is present

Option NR : Noise Reduction

Function: Enable/disable noise reduction function Values: OFF = Disabled, customer menu item Noise Reduction not available ON = Enabled, customer menu item Noise Reduction available

Option CP : Contrast Plus

Function: Enable/disable contrast plus function Values: OFF = Disabled, customer menu item Contrast Plus not available ON = Enabled, customer menu item Contrast Plus available

Option CT : Color Temperature

Function: Enable/disable color temperature function Values: OFF = Disabled, customer menu item Color Temperature not available ON = Enabled, customer menu item Color Temperature available

Option EW : East-West Functions

Function: Enable/disable east-west control function Values: OFF = Disabled, east-west alignment not available in SAM (EWW, EWP, EWC, EWT) ON = Enabled, east-west alignment available in SAM (EWW, EWP, EWC, EWT)

Option BS : Video Processor Standby

Function: Enable/disable video processor standby Values: OFF = Disabled, video processor standby is not active ON = Enabled, video processor standby is active

Option AS : Video Processor Auto Startup

Function: Enable/disable video processor auto-startup Values: OFF = Enabled, video processor is in auto-startup mode ON = Disabled, video processor is switched on under control of microcontroller

Option BT : Bass/Treble Control/Boost

Function: Enable/disable bass and treble function Values: OFF = Disabled, customer menu items Bass and Treble not available ON = Enabled, customer menu items Bass and Treble available

Option IS : Incredible Surround

Function: Enable/disable incredible surround function Values: OFF = Disabled, incredible surround function not available ON = Enabled, incredible surround function available

Option VL : Volume limiter

Function: Enable/disable volume limiter Values: OFF = Disabled, customer menu item Volume Limiter not available ON = Enabled, customer menu item Volume Limiter available

Option UB : Ultra Bass

Function: Enable/disable ultra bass function Values: OFF = Disabled, ultra bass function not available

ON = Enabled, ultra bass function available

Option LV : Automatic Volume Leveller (AVL)

Function: Enable/disable automatic volume leveller function Values: OFF = Disabled, customer menu item AVL not available ON = Enabled, customer menu item AVL available

Option DU : SAP

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Function: Set SAP configuration (sets with DBX stereo system only) Values: OFF = Disabled, stereo/SAP not available ON = Enabled, stereo/SAP available

Option AO : Audio Out (Fixed/Variable)

Function: Set audio output type (where present) Values: OFF = Fixed audio out ON = Variable audio out (always on)

Option ST : Sound Type

Function: Set the sound type Values: BG PAL system

I PAL system

DK PAL system M Default for USA

Option SB : Sound Board

Function: Set the sound board configuration Values: DB = DBX/SAP (BTSC)

EC = BTSC stereo (No SAP)

MA = Mono All

MS = BiSonic (Mono from tuner, Stereo from A/V jacks)

Service Alignment Mode (SAM)

1. The Service Alignment Mode (SAM) is used to make tuning adjustments, align the white tone, adjust the picture geometry, and make sound adjustments.

2. To enter the Service Alignment Mode (SAM), press the following key sequence on the remote control transmitter:

0-6-2-5-9-6-Status Do not allow the display to time out between entries while keying the sequence. SAM can also be entered by pressing the Channel Down and Volume Down keys

on the local keyboard simultaneously while in SDM mode. When Service Alignment Mode is entered, the text "SAM" will be displayed in the top right corner of the screen.

3. When Service Alignment Mode is entered, service unfriendly modes are disabled. The following volatile SAM item values are set:

♦ AKB = 0 ♦ VSD = 0 ♦ AFW = 275 kHz ♦ SBL = 0

4. When the unit is operating in Service Alignment Mode, all normal on-screen displays are suppressed and replaced by a special service display. The first screen seen upon entering SAM is the ”top level SAM menu.“ The service technician must return to the top level SAM menu before exiting with a power-off command. A sample SAM top level menu display is shown below.

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Explanation of top level SAM menu display:

The Software Identification, Cluster, and Version are explained in the Service Default Mode section under ”Explanation of Display.“ The Menu Items and Sub Menus are explained below. Note: The ”Audio“ sub menu will not be seen on screen when Service Alignment

Mode is first entered. Use the Menu Up and Menu Down buttons on the remote control to view all menu items and sub menu choices.

5. To select a menu item or a sub menu in SAM, use the Menu Up or Menu Down keys on the remote control to highlight the item or menu you wish to adjust.

6. To change the value of a highlighted SAM menu item (AKB or VSD), use the Menu Left or Menu Right keys on the remote control.

7. To enter a highlighted SAM sub menu, use the Menu Left or Menu Right keys.

After entering the sub menu, use the Menu Up or Menu Down to select an item

within the sub menu.

Use the Menu Left or Menu Right keys to change the value of the selected item.

Press the Menu button to return to the top level SAM menu.

8. Press the Menu button on the remote control while in SAM to switch the software to a Virtual Customer Mode; the text "SAM" will still be displayed in the upper right corner of the screen. In this mode, all customer menu adjustments to the set can be made. From the Virtual Customer Mode, press the Menu button to return to the SAM Menu.

9. Press the Status button on the remote control to toggle the OSD (except ”SAM“) ON and OFF.

10. To exit the Service Alignment Mode, turn the set off with the Power button on the remote control. To turn off the set without exiting SAM (or erasing any stored error codes), unplug the AC cord. When the set is powered on again, the Service Alignment Mode will still be active. Note: When SAM is exited or a power interrupt occurs, the volatile SAM items

AKB, VSD, AFW, and SBL will be reset to their original values.

Main Menu

The SAM main menu contains the following items:

− AKB

− VSD

− Tuner sub menu

− White Tone sub menu

− Geometry sub menu

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− Audio sub menu

Menu: MAIN Values Remarks AKB Black current loop

(Auto Kine Bias)

VSD Vertical scan

disable

TUNER WHITE TONE GEOMETRY AUDIO

OFF/ON (0/1) OFF/ON (0/1)

> > > >

Tuner sub menu

The tuner sub menu contains the following items:

− IF-PLL

− AFW

− AGC

− YD

− CL

− AFA and AFB

The items AFA and AFB cannot be selected; they are for monitoring purposes only. The item values are stored in EEPROM if this sub menu is left. A sample display of the Tuner sub menu is shown below.

Sub Menu: TUNER Values Remarks IF-PLL IF-PLL alignment 0 – 127 This adjustment is auto-aligned

(no action required)

AFW AFC window 125/275

kHz

AGC AGC takeover

point

YD Y-delay 0 – 15 Always set to 12 (no effect)

0 – 63 See below

Always set to 275 kHz

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YD Y-delay

adjustment

CL Cathode drive

level AFA 0 / 1 read only, not accessible AFB 0 / 1 read only, not accessible

0 – 15 Always set to 12 (no effect) 0 – 7 Always set to 4

Tuner Adjustment: AGC Takeover Point (AGC):

1. Enter the Service Alignment Mode (SAM) by pressing the following key sequence on the remote control transmitter:

0-6-2-5-9-6-Status

Do not allow the display to time out between entries while keying the sequence.

2. From the top level SAM menu, use the Menu Up/Down keys to highlight the Tuner sub menu.

3. Use the menu left/right keys to enter the Tuner sub menu.

4. In the Tuner sub menu, use the Menu Up/Down keys to highlight AGC.

5. Use the Menu Right key to raise the value of AGC until snow appears in the picture.

6. Then use the Menu Left/Right keys to reduce AGC value until the snow disappears. a. AGC values between 10 and 20 are nominal. b. Single digit AGC values may cause overload.

7. Upon completion of Tuner adjustment, press the Menu button to return to the top level SAM menu.

White Tone sub menu

The white tone sub menu contains the following items:

− Normal Red

− Normal Green

− Normal Blue

− Delta Cool Red

− Delta Cool Green

− Delta Cool Blue

− Delta Warm Red

− Delta Warm Green

− Delta Warm Blue

Note: Delta values are only used in models with the item ”Color Temperature“ in the

customer menu.

OSD is kept to a minimum in this menu, in order to make white tone alignment possible. The item values are stored in EEPROM if this sub menu is left. The Contrast Plus feature (black stretch) is set to OFF when the White Tone sub menu is entered. A sample display of the White Tone sub menu is shown below.

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Sub Menu: WHITE TONE Value

Range

NORMAL Starting Values:

NORMAL RED 0 – 63 45 NORMAL GREEN 0 – 63 32 NORMAL BLUE 0 – 63 39

COOL

DELTA COOL RED –2 Delta values are a change of the

DELTA COOL GREEN 0 DELTA COOL BLUE +6

WARM

DELTA WARM RED +2 DELTA WARM GREEN 0 DELTA WARM BLUE –7

White Tone Adjustments:

Note: The following procedure was performed with a Sencore VG91 Universal Video

Generator providing grey scale bars.

1. Enter the Service Alignment Mode (SAM) by pressing the following key sequence on the remote control transmitter:

0-6-2-5-9-6-Status Do not allow the display to time out between entries while keying the sequence.

2. From the top level SAM menu, use the Menu Up/Down keys to highlight the White Tone sub menu.

3. Use the Menu Left/Right keys to enter the White Tone sub menu.

4. Set the VG91 Generator as follows: STD TV Ch. 3, RF-IF Range set to HI, RF-IF

Default

Value

Remarks

normal values. These start at the default values, and are set to achieve cool and warm steps of color temperature in the customer menu. Standard factory settings are given as the default values.

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Level set to NORMAL (1), Video Pattern = Raster, R-G-B raster controls OFF.

5. Connect the RF output of the generator to the Television Antenna Input, and adjust the VG91 level to remove any snow from the raster.

6. Turn off chroma at generator and leave grey scale bars.

7. From the White Tone sub-menu, use the Menu Up/Down keys to select Normal Red, Normal Green, or Normal Blue. Then use the Menu Left/Right keys to adjust the values to obtain the best white balance.

8. A reasonable starting point for NORMAL is:

Normal Red=45, Normal Green=32, Normal Blue=39

9. After NORMAL is set, use the same method to set DELTA COOL and DELTA WARM as offsets. A reasonable starting point for DELTA COOL is: Delta Cool Red=(–2), Delta Cool Green=0, Delta Cool Blue=+6 A reasonable starting point for DELTA WARM is: Delta Warm Red=+2, Delta Warm Green=0, Delta Warm Blue=(-7)

10. After the values are set, or if no changes are required, press Menu to return to the top level SAM menu.

Geometry sub menu

OSD is kept to a minimum in this sub menu in order to make picture geometry adjustments possible. The item values are stored in EEPROM if this sub menu is left. The value of item Service Blanking (SBL) is not stored in EEPROM, and it is set to OFF when the geometry sub menu is exited. A sample display of the Geometry sub menu is shown below.

The picture geometry sub menu contains the following items:

Sub Menu:

VAM Vertical amplitude 0 – 63 VSL Vertical slope 0 – 63 SBL Service blanking ON/OFF HSH Horizontal shift 0 – 63

GEOMETRY Values Remarks

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EWW E-W width 0 – 63 Only available in models with an

East-West Panel (Diode Modulator)

EWP E-W parabola/width 0 – 63 Only available in models with an

East-West Panel (Diode Modulator)

EWT E-W trapezium 0 – 63 Only available in models with an

East-West Panel (Diode Modulator)

EWC E-W corner parabola 0 – 63 Only available in models with an

East-West Panel (Diode Modulator) H60 Delta HSH for 60 Hz 0 – 15 Not used V60 Delta VAM for 60 Hz 0 – 15 Not used VSC Vertical S-Correction 0 – 63 VSH Vertical shift 0 – 63

Geometry Adjustments:

Notes:

1. The following Geometry adjustments were performed with a Sencore VG91 Universal Video Generator.

2. Set the VG91 Generator as follows: STD TV Ch. 3, RF-IF Range set to HI, RF-IF Level set to NORMAL (1), Video Pattern = Raster, R-G-B raster controls OFF, crosshatch or center cross pattern as required.

3. Connect the RF output of the generator to the Television Antenna Input, and adjust the VG91 level to remove any snow from the raster.

Vertical Shift (VSH):

1. Enter the Service Alignment Mode (SAM) by pressing the following key sequence on the remote control transmitter:

0-6-2-5-9-6-Status

Do not allow the display to time out between entries while keying the sequence.

2. From the top level SAM menu, use the Menu Up/Down keys to highlight the Geometry sub menu.

3. Use the Menu Left/Right keys to enter the Geometry sub menu.

4. In the Geometry sub-menu, use the Menu Up/Down keys to select VAM.

5. Input a center cross pattern to the antenna/cable input terminal.

6. Using the Menu Left/Right keys, adjust VSH so that the horizontal bar is properly centered, top to bottom.

7. If other Geometry adjustments are needed, proceed to the necessary adjustment using the Menu Up/Down buttons.

8. Upon completion of Geometry adjustments, press the Menu button to return to the top level SAM menu.

Vertical Amplitude (VAM):

1. Enter the Service Alignment Mode (SAM) by pressing the following key sequence on the remote control transmitter:

0-6-2-5-9-6-Status

Do not allow the display to time out between entries while keying the sequence.

2. From the top level SAM menu, use the Menu Up/Down keys to highlight the Geometry sub menu.

3. Use the Menu Left/Right keys to enter the Geometry sub menu.

4. In the Geometry sub-menu, use the Menu Up/Down keys to select VAM.

5. Input a crosshatch pattern to the antenna/cable input terminal.

6. Using the Menu Left button, reduce the value so that the picture does not fill the entire screen.

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7. Use the Menu Up/Down keys to select VSH (Vertical Shift) from the Geometry sub-menu and, using the Menu Left/Right keys, center the picture on the screen, top to bottom.

8. Using the cursor up/down keys, select VAM from the Geometry sub-menu, and use the Menu Right key to increase the value to obtain a slight overscan.

9. If other Geometry adjustments are needed, proceed to the necessary adjustment using the Menu Up/Down buttons.

10. Upon completion of Geometry adjustments, press the Menu button to return to the top level SAM menu.

Horizontal Shift (HSH):

Note: This adjustment centers the video on the raster. It does not move the raster.

1. Enter the Service Alignment Mode (SAM) by pressing the following key sequence on the remote control transmitter:

0-6-2-5-9-6-Status

Do not allow the display to time out between entries while keying the sequence.

2. From the top level SAM menu, use the Menu Up/Down keys to highlight the Geometry sub menu.

3. Use the Menu Left/Right keys to enter the Geometry sub menu.

4. In the Geometry sub-menu, use the Menu Up/Down keys to select HSH.

5. Input a center cross pattern to the antenna/cable input terminal.

6. Using the Menu Left/Right keys, adjust HSH so that the vertical bar is properly centered, left to right.

7. If other Geometry adjustments are needed, proceed to the necessary adjustment using the Menu Up/Down keys.

8. Upon completion of Geometry adjustments, press the Menu button to return to the top level SAM menu.

Vertical Slope (VSL):

1. Enter the Service Alignment Mode (SAM) by pressing the following key sequence on the remote control transmitter:

0-6-2-5-9-6-Status

Do not allow the display to time out between entries while keying the sequence.

2. From the top level SAM menu, use the Menu Up/Down keys to highlight the Geometry sub menu.

3. Use the Menu Left/Right keys to enter the Geometry sub menu.

4. In the Geometry sub-menu, use the Menu Up/Down keys to select VSL.

5. Input a crosshatch pattern to the antenna/cable input terminal.

6. Using the Menu Left/Right keys, adjust VSL so that the squares at the bottom of the screen are equal in size to the squares at the top of the screen.

7. If other Geometry adjustments are needed, proceed to the necessary adjustment using the Menu Up/Down keys.

8. Upon completion of Geometry adjustments, press the Menu button to return to the top level SAM menu.

Vertical S-Correction (VSC):

1. Enter the Service Alignment Mode (SAM) by pressing the following key sequence on the remote control transmitter:

0-6-2-5-9-6-Status

Do not allow the display to time out between entries while keying the sequence.

2. From the top level SAM menu, use the Menu Up/Down keys to highlight the Geometry sub menu.

3. Use the Menu Left/Right keys to enter the Geometry sub menu.

4. In the Geometry sub-menu, use the Menu Up/Down keys to select VSC.

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5. Input a crosshatch pattern to the antenna/cable input terminal.

6. Using the Menu Left/Right keys, adjust VSC so that the squares at the center of the screen are equal in size to the squares at the top and bottom of the screen.

7. If other Geometry adjustments are needed, proceed to the necessary adjustment using the Menu Up/Down keys.

8. Upon completion of Geometry adjustments, press the Menu button to return to the top level SAM menu.

Service Blanking (SBL):

Service Blanking provides a straight cutoff line in the center of the raster. It is useful when centering the raster. It can also be used in adjusting the yoke and setting vertical size and linearity.

1. Enter the Service Alignment Mode (SAM) by pressing the following key sequence on the remote control transmitter:

0-6-2-5-9-6-Status

Do not allow the display to time out between entries while keying the sequence.

2. From the top level SAM menu, use the Menu Up/Down keys to highlight the Geometry sub menu.

3. Use the Menu Left/Right keys to enter the Geometry sub menu.

4. In the Geometry sub-menu, use the Menu Up/Down keys to select SBL.

5. Use the Menu Left/Right keys to toggle SBL ON or OFF.

6. With SBL on, VSH can be used to center the raster on the fiduciary marks (the small notches in the phosphor on the right and left edge of the CRT). These are absolute center.

7. If other Geometry adjustments are needed, proceed to the necessary adjustment using the Menu Up/Down keys.

8. Upon completion of Geometry adjustments, press the Menu button to return to the top level SAM menu.

Delta HSH for 60Hz (H60):

Note: This adjustment should not be changed from the factory preset value (10).

Delta VAM for 60Hz (V60):

Note: This adjustment should not be changed from the factory preset value (5).

Note: The following GEOMETRY adjustments can only be performed on models

containing an East-West Panel (Diode Modulator).

East-West Width (EWW):

1. Enter the Service Alignment Mode (SAM) by pressing the following key sequence

on the remote control transmitter:

0-6-2-5-9-6-Status

Do not allow the display to time out between entries while keying the sequence.

2. From the top level SAM menu, use the Menu Up/Down keys to highlight the

Geometry sub menu.

3. Use the Menu Left/Right keys to enter the Geometry sub menu.

4. In the Geometry sub menu, use the Menu Up/Down keys to select EWW.

5. Input a crosshatch pattern to the antenna/cable input terminal.

6. Use the Menu Left key to reduce the value of EWW so that the picture does not fill

the entire screen.

7. Use the Menu Up/Down keys to select HSH (Horizontal Shift) from the Geometry

sub menu and, using the Menu Left/Right keys, center the picture on the screen.

8. Use the Menu Up/Down keys to select EWW from the Geometry sub menu, and

use the Menu Right key to increase the value to obtain a slight overscan.

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Note: Remember, adjusting EWW will affect other horizontal adjustments.

9. If other Geometry adjustments are needed, proceed to the necessary adjustment

using the Menu Up/Down keys.

10. Upon completion of Geometry adjustments, press the Menu button to return to

the top level SAM menu.

East-West Parabola/Width (EWP):

1. Enter the Service Alignment Mode (SAM) by pressing the following key sequence

on the remote control transmitter:

0-6-2-5-9-6-Status

Do not allow the display to time out between entries while keying the sequence.

2. From the top level SAM menu, use the Menu Up/Down keys to highlight the

Geometry sub menu.

3. Use the Menu Left/Right keys to enter the Geometry sub menu.

4. In the Geometry sub menu, use the Menu Up/Down keys to select EWP.

5. Input a crosshatch pattern to the antenna/cable input terminal.

6. Use the Menu Left/Right keys to adjust the value of EWP.

7. This adjusts the top and bottom of the right and left side of the raster, adjusting the

raster by “bending” it out or in.

8. This adjustment should be set so that the screen appears to be straight and “flat.”

9. If other Geometry adjustments are needed, proceed to the necessary adjustment

using the Menu Up/Down keys.

10. Upon completion of Geometry adjustments, press the Menu button to return to the top level SAM menu.

East-West Trapezium (EWT):

1. Enter the Service Alignment Mode (SAM) by pressing the following key sequence

on the remote control transmitter:

0-6-2-5-9-6-Status

Do not allow the display to time out between entries while keying the sequence.

2. From the top level SAM menu, use the Menu Up/Down keys to highlight the

Geometry sub menu.

3. Use the Menu Left/Right keys to enter the Geometry sub menu.

4. In the Geometry sub menu, use the Menu Up/Down keys to select EWT.

5. Input a crosshatch pattern to the antenna/cable input terminal.

6. Use the Menu Left/Right keys to adjust the value of EWT.

7. This balances the width at the top of the screen to the width at the bottom of the

screen.

8. This adjustment should be set so the top and bottom of the screen are of equal

width.

9. If other Geometry adjustments are needed, proceed to the necessary adjustment

using the Menu Up/Down keys.

10. Upon completion of Geometry adjustments, press the Menu button to return to the top level SAM menu.

East-West Corner Parabola (EWC):

1. Enter the Service Alignment Mode (SAM) by pressing the following key sequence

on the remote control transmitter:

0-6-2-5-9-6-Status

Do not allow the display to time out between entries while keying the sequence.

2. From the top level SAM menu, use the Menu Up/Down keys to highlight the

Geometry sub menu.

3. Use the Menu Left/Right keys to enter the Geometry sub menu.

4. In the Geometry sub menu, use the Menu Up/Down keys to select EWC.

5. Input a crosshatch pattern to the antenna/cable input terminal.

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6. Use the Menu Left/Right keys to adjust the value of EW CORNER.

7. This adjustment affects the very corner sections of the raster, and acts as a

“touch-up” of the EWP (East-West Parabola/Width) adjustment.

8. This adjustment should be set so the corners of the screen are straight and equal

in size.

9. If other Geometry adjustments are needed, proceed to the necessary adjustment

using the Menu Up/Down keys.

10. Upon completion of Geometry adjustments, press the Menu button to return to the top level SAM menu.

Audio sub menu

The audio sub menu item values are stored in EEPROM if this sub menu is left. A sample display of the Audio sub menu is shown below.

The Audio sub menu contains the following item on stereo chassis:

Sub Menu: AUDIO Values Remarks AT Attack time at AVL 1 – 4 Normal setting is

Audio Adjustment: Attack Time at AVL (AT):

1. Enter the Service Alignment Mode (SAM) by pressing the following key sequence on the remote control transmitter:

0-6-2-5-9-6-Status

Do not allow the display to time out between entries while keying the sequence.

2. From the top level SAM menu, use the Menu Up/Down keys to highlight the Audio sub menu.

3. Use the Menu Left/Right keys to enter the Audio sub menu.

4. Use the Menu Left/Right keys to adjust the value of AT.

5. Set the volume of AT to 4.

6. Upon completion of Audio adjustment, press the Menu button to return to the top level SAM menu.

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Convergence and Purity Adjustments

Notes:

1. The following adjustments were performed with a Sencore VG91 Universal Video Generator.

2. Set the VG91 Generator as follows: STD TV Ch. 3, RF-IF Range set to HI, RF-IF Level set to NORMAL (1), Video Pattern = Raster, R-G-B raster controls OFF, Mode Switch set to L+R, Audio Frequency set to 300Hz, and 0 Pilot (max. CCW).

3. Connect the RF output of the generator to the Television Antenna Input, and adjust the VG91 level to remove any snow from the raster.

Pre-Convergence Procedure

Note: The degaussing procedure should be performed prior to this adjustment.

1. Place the multi-pole Purity and Convergence Assembly with the 2-Y pole purity rings directly in the gap between the G2 and G3 (focus) grids as shown in the "Convergence and Purity Assembly" graphic.

2. Enter Service Alignment Mode (refer to Service Alignment Mode section).

3. Apply a center cross or crosshatch pattern to the antenna/cable input terminal.

4. Select the White Tone sub-menu by pressing the Menu Up/Down keys on the remote control so that White Tone is highlighted.

5. Use the Menu Left/Right keys to enter the White Tone sub-menu.

6. Use Menu Up/Down keys to toggle between the options. Be sure to record the values of all options (Normal Red/Green/Blue, Delta Cool Red/Green/Blue, and Delta Warm Red/Green/Blue).

7. Use the Menu Up/Down keys to select Normal Green, and use the Menu Left key to set Normal Green to minimum.

8. Loosen the yoke clamp screw, pull the yoke back, and remove the three yoke wedges.

9. Slide the yoke all the way forward so that it rests against the bell of the CRT.

10 Tighten the yoke clamp screw so that the yoke does not drop away from the bell

of the CRT.

11. Slowly spread, and if necessary, rotate the 2-Y pole purity rings so that the red and blue lines are at least parallel and preferably coincide at the 6:00 and 12:00 positions as shown in the "2Y Spread and 2Y Rotate" graphic.

12. Proceed to the Color Purity Adjustment.

Color Purity Adjustment

1. Connect a solid white pattern signal to the antenna/cable input terminal.

2. Use the Menu Up/Down keys to select Normal Blue, and use the Menu Left key to set Normal Blue to minimum.

3. Use the Menu Up/Down keys to select Normal Red, and use the Menu Right key to set Normal Red to maximum.

4. Slowly spread the 2-X pole purity rings to center the red portion of the screen, leaving the same amount of green on one side of the screen as blue on the other side.

5. Tighten the yoke clamp screw slightly so that the yoke may be moved with some friction.

6. Proceed to the Static Center Convergence Adjustment.

Static Center Convergence Adjustment

1. Apply a center cross or crosshatch pattern to the antenna/cable input terminal and observe the screen to ensure that the yoke is not tilted. If necessary, rotate

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the yoke to obtain a level raster.

2. Use the Menu Up/Down keys to select Normal Blue, and use the Menu Right key to set Normal Blue to maximum.

3. Slowly spread, and if necessary, rotate the 4-pole magnetic rings to converge red and blue lines at the center of the screen.

4. Use the Menu Up/Down keys to select Normal Green, and use the Menu Right key to set Normal Green to maximum.

5. Slowly spread, and if necessary, rotate the 6-pole magnetic rings to converge red/blue on green lines at the center of the screen.

6. Repeat steps three and five for optimum performance.

7. Proceed to the Dynamic Edge Convergence Adjustment.

(Display Convergence and Purity Assembly)

Dynamic Edge Convergence Adjustment

Note: To secure the correct position of the deflection yoke, three rubber wedges are

used. They are ultimately to be placed as shown in Figure 3c or Figure 4c.

1. Apply a crosshatch pattern to the antenna/cable input terminal.

2. Use the Menu Up/Down keys to select Normal Green, and use the Menu Left key to set Normal Green to minimum.

3. Tilt the yoke up and down to converge the red and blue vertical lines at the 6:00 and 12:00 positions and the red and blue horizontal lines at the 3:00 and 9:00 positions (refer to Figure 5 ). When the correct position has been found, place a rubber wedge between the yoke and the CRT. If the yoke is tilted up, place wedge one as shown in Figure 3a; if it is tilted down, place wedge one as shown in Figure 4a.

4. Tilt the yoke to the left and right to find the point of best possible convergence of the red and blue lines at the edges, top and bottom of the screen as shown in Figure 6. When the correct position is located, place wedges two and three as shown in Figure 3b or Figure 4b.

5. Remove wedge one and place it in the final position as shown in Figure 3c or Figure 4c.

6. Use the Menu Up/Down keys to select Normal Green, and use the Menu Right key to set Normal Green to maximum.

7. Proceed to the White Balance Setup.

(Display Figures 3a, 3b, 3c, 4a, 4b, & 4c of Wedge Placement Display)

(Display Figures 5 & 6 of Yoke Tilt Display)

Master Screen (VG2)/ White Balance Setup:

1. With the set OFF, rotate VG2 (located on the lower part of the flyback transformer) counterclockwise.

2. Use the Power Button (on the remote control or the local keyboard) to turn the set ON, without a signal, and rotate VG2 clockwise until snow is visible.

3. Enter Service Alignment Mode (refer to Service Alignment Mode section).

4. Enter the Virtual Customer Menu by pressing the Menu button on the remote and set brightness and picture to 31 and color to 0.

5. Apply an NTSC color bar signal to the antenna/cable input terminal and tune to the active channel.

9. Connect an oscilloscope, 20V per division and 10 uSec time base, at the junction of resistors 3333 and 3334 on the CRT Board. Observe the stairstep pattern

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while adjusting VG2.

Hint: Counterclockwise adjustment will compress bottom of stairstep pattern.

Clockwise adjustment will compress top of stairstep pattern.

10. Adjust VG2 midway between top and bottom compression.

11. Proceed to White-Tone Adjustments under White Tone sub-menu in the Service Alignment Mode section to complete White Balance Setup.

Customer Service Mode (CSM)

1. The Customer Service Mode (CSM) is used to retrieve data on the TV operation

settings and stored error codes.

2. To enter the Customer Service Mode, press and hold the Mute button on the

remote control and any key on the local keyboard (except ”Power“) for more than 4 seconds. When the set is in Customer Service Mode, the text "CSM" is displayed in the top right corner of the screen.

3. To use this system, the customer is instructed by phone to enter CSM and read off

the display that appears. This information is useful to gain insights into failures before traveling to the customer's home.

4. This information can also be used to avoid nuisance trips to the home when the

problem is an operational error (example: Closed Caption is on or set is in Hospital Mode).

5. When entering CSM, all disruptive functions are turned off, and service unfriendly

modes are ignored. While CSM is active, no changes can be made in settings or functions. When CSM is exited, the TV returns to all prior operational settings.

6. To exit CSM, press any key (on the remote control or local keyboard) except

”Channel Up“ or ”Channel Down.“ To exit CSM and return the set to normal operation mode, press any key on the local keyboard or the remote control except Channel Up, Channel Down, or Power. To exit CSM and turn the set off, press the Power button on either the TV set or the remote control.

7. A sample CSM display is shown below.

1 002A L90US11 1.0 2 CODES 0 0 0 0 0 3 OP 202 255 135 228 59 206 208 4 SYS: 5 NOT TUNED 6 7 8 9 VOL LIM 255

C S M

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Explanation of CSM Display Screen

The following information is displayed on screen:

• Text ”CSM“ on the first line

• Line number for every line (to make CSM language independent)

• To view multiple CSM pages (such as lines 8 and 9), use the Channel Up or

Channel Down keys

• For more information on lines 1, 2, and 3, see SDM section ”Explanation of

Display“

• Line 1 displays the run timer and the software identification, cluster, and version

• Line 2 displays the error buffer contents (the word ”error“ is not used on this

screen, instead ”codes“ is used)

• Line 3 displays the option code information

• Line 4 displays SYS: (This is not used)

• Lines 5 through 8 display information on active service unfriendly modes

• Line 5 displays the text ”NOT TUNED“ if no television station is tuned

• Line 6 displays the text ”TIMER“ if the sleep timer or ”on“ timer is active

• Line 7 displays the text ”LOCKED“ if one or more channels or presets is locked via

child lock

• Line 8 displays the text ”HOSPITAL“ if hospital mode is active, or ”HOTEL“ if hotel

mode is active

• If the volume limiter is active, line 9 displays the text ”VOL LIM“ and the set value

of the volume limiter. If the volume limiter is inactive, the displayed value will be 255 (the maximum volume allowed).

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CSM Flow Chart

any key on the local keyboard

feature settings (that were

when the set is switched on,

picture, sound and feature

Normal operation mode

Press "MUTE" button (RC) and

(except "POWER") for more than 4 seconds

Store current picture, sound and feature settings (for later retrieval)

Set pre-defined picture, sound and feature settings

Ignore service unfriendly options

Display CSM information screen

"Channel up" (RC or local keyboard)

Exit CSM

Restore picture, sound and stored during entry)

Other key

"Channel down" (RC or local keyboard)

“POWER” (RC or local keyboard)

F8 CHASSIS FEATURE LISTINGS

USA/CANADIAN CHASSIS LISTINGS LATIN AMERICAN CHASSIS LISTINGS

To next CSM pageTo previous CSM page

Off (Exit CSM):

settings (that were stored during entry) are restored

INDUSTRIAL CHASSIS LISTINGS

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Convergence and Purity Assembly - (Display Convergence and Purity Assembly)

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2Y Spread and 2Y Rotate

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(Display Figures 3a, 3b, 3c, 4a, 4b, & 4c of Wedge Placement Display)

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(Display Figures 5 & 6 of Yoke Tilt Display)

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USA/CANADIAN CHASSIS LISTINGS

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Philips Consumer Electronics

Technical Service Data

Service Solutions Group Technical Publications Dept. P.O. Box 555 401 East Old City Johnson Hwy. Jefferson City, TN 37760

SCHEMATIC DIAGRAMS AND PC BOARDS

1. POWER SUPPLY - SECT. A1 SCHEMATIC

2. HORIZONTAL DEFLECTION - SECT. A2 SCHEMATIC

3. VERTICAL DEFLECTION - SECT. A3 SCHEMATIC

4. SYNCRONIZATION - SECT. A4 SCHEMATIC

5. TUNER/VIDEO IF - SECT. A5 SCHEMATIC

6. VIDEO PROCESSING - SECT. A6 SCHEMATIC

7. CONTROL PROCESSOR - SECT. A7 SCHEMATIC

8. CUSTOME CONTROL - SECT. A8 SCHEMATIC

9. BTSC DECODER - SECT. A9 SCHEMATIC

10. NICAM-2CS DECODER - SECT. A10 SCHEMATIC

11. SMART SOUND - SECT. A11 SCHEMATIC

12. AUDIO AMPLIFIER - SECT. A12 SCHEMATIC

13. HEADPHONE - SECT. A13 SCHEMATIC

14. REAR I/O CINCH - SECT. A14 SCHEMATIC

15. CRT PANEL - SECT. B SCHEMATIC

16. BLOCK DIAGRAM

17. MAIN CHASSIC & CRT PCB (TOP VIEW)

18. MAIN CHASSIS & CRT PCB (BOTTOM VIEW)

Manual 7583

Model no.: 25PT10C121 Chassis no.: 25F8 First Publish: 10-9-2000 Rev. Date: 3-21-2001 Print Date: 4/12/2003

REFER TO SAFETY GUIDELINES

CAUTION: USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING

Visit our World Wide Web Site at http://www.magnavox.com

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25PT10C121 - Manual# 7583 POWER SUPPLY - SECT. A1 SCHEMATIC Page: 1 of 1825PT10C121 - Manual# 7583 POWER SUPPLY - SECT. A1 SCHEMATIC Page: 1 of 18

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25PT10C121 - Manual# 7583 Page: 2 of 18

25PT10C121 - Manual# 7583 Page: 2 of 18 HORIZONTAL DEFLECTION - SECT. A2 SCHEMATIC

HORIZONTAL DEFLECTION - SECT. A2 SCHEMATIC

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25PT10C121 - Manual# 7583 VERTICAL DEFLECTION - SECT. A3 SCHEMATICPage: 3 of 1825PT10C121 - Manual# 7583 VERTICAL DEFLECTION - SECT. A3 SCHEMATICPage: 3 of 18

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25PT10C121 - Manual# 7583 SYNCRONIZATION - SECT. A4 SCHEMATIC Page: 4 of 1825PT10C121 - Manual# 7583 SYNCRONIZATION - SECT. A4 SCHEMATIC Page: 4 of 18

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25PT10C121 - Manual# 7583 TUNER/VIDEO IF - SECT. A5 SCHEMATIC Page: 5 of 1825PT10C121 - Manual# 7583 TUNER/VIDEO IF - SECT. A5 SCHEMATIC Page: 5 of 18

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25PT10C121 - Manual# 7583 VIDEO PROCESSING - SECT. A6 SCHEMATIC Page: 6 of 1825PT10C121 - Manual# 7583 VIDEO PROCESSING - SECT. A6 SCHEMATIC Page: 6 of 18

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25PT10C121 - Manual# 7583 CONTROL PROCESSOR - SECT. A7 SCHEMATIC Page: 7 of 1825PT10C121 - Manual# 7583 CONTROL PROCESSOR - SECT. A7 SCHEMATIC Page: 7 of 18

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25PT10C121 - Manual# 7583 CUSTOME CONTROL - SECT. A8 SCHEMATIC Page: 8 of 1825PT10C121 - Manual# 7583 CUSTOME CONTROL - SECT. A8 SCHEMATIC Page: 8 of 18

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25PT10C121 - Manual# 7583 BTSC DECODER - SECT. A9 SCHEMATIC Page: 9 of 1825PT10C121 - Manual# 7583 BTSC DECODER - SECT. A9 SCHEMATIC Page: 9 of 18

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25PT10C121 - Manual# 7583 NICAM-2CS DECODER - SECT. A10 SCHEMATIC Page: 10 of 1825PT10C121 - Manual# 7583 NICAM-2CS DECODER - SECT. A10 SCHEMATIC Page: 10 of 18

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25PT10C121 - Manual# 7583 SMART SOUND - SECT. A11 SCHEMATIC Page: 11 of 1825PT10C121 - Manual# 7583 SMART SOUND - SECT. A11 SCHEMATIC Page: 11 of 18

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25PT10C121 - Manual# 7583 AUDIO AMPLIFIER - SECT. A12 SCHEMATIC Page: 12 of 1825PT10C121 - Manual# 7583 AUDIO AMPLIFIER - SECT. A12 SCHEMATIC Page: 12 of 18

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25PT10C121 - Manual# 7583 HEADPHONE - SECT. A13 SCHEMATIC Page: 13 of 1825PT10C121 - Manual# 7583 HEADPHONE - SECT. A13 SCHEMATIC Page: 13 of 18

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25PT10C121 - Manual# 7583 REAR I/O CINCH - SECT. A14 SCHEMATIC Page: 14 of 1825PT10C121 - Manual# 7583 REAR I/O CINCH - SECT. A14 SCHEMATIC Page: 14 of 18

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25PT10C121 - Manual# 7583 CRT PANEL - SECT. B SCHEMATIC Page: 15 of 1825PT10C121 - Manual# 7583 CRT PANEL - SECT. B SCHEMATIC Page: 15 of 18

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25PT10C121 - Manual# 7583 BLOCK DIAGRAM Page: 16 of 1825PT10C121 - Manual# 7583 BLOCK DIAGRAM Page: 16 of 18

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25PT10C121 - Manual# 7583 MAIN CHASSIC & CRT PCB (TOP VIEW) Page: 17 of 1825PT10C121 - Manual# 7583 MAIN CHASSIC & CRT PCB (TOP VIEW) Page: 17 of 18

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25PT10C121 - Manual# 7583 MAIN CHASSIS & CRT PCB (BOTTOM VIEW) Page: 18 of 1825PT10C121 - Manual# 7583 MAIN CHASSIS & CRT PCB (BOTTOM VIEW) Page: 18 of 18

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Philips Consumer Electronics

Technical Service Data

Service Solutions Group Technical Publications Dept. P.O. Box 555 401 East Old City Johnson Hwy. Jefferson City, TN 37760

Manual 7583

Model no.: 25PT10C121 Chassis no.: 25F8 First Publish: 10-9-2000 Rev. Date: 3-21-2001 Print Date: 4/12/2003

Scope Patterns

REFER TO SAFETY GUIDELINES

CAUTION: USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING

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25PT10C121 - Manual no. 7583 Page: 1 of 3

V2a

P1 P2 P3

L1 L2 L3

L5 L6 F1

F3 L1 F2

V1a V1b V1c

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25PT10C121 - Manual no. 7583 continued Page: 2 of 3

V5a

A1a

A2d

V2b V2c V3

V5b V5c C1

C3 C4 C5

A1a A2a A2b

A2a A2b A2c

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25PT10C121 - Manual no. 7583 continued Page: 3 of 3

A3d

V6a

A3a A3b A3c

V4a V4b V4c

V6b V6c 1

3 4 5

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Philips Consumer Electronics

Technical Service Data

Service Solutions Group Technical Publications Dept. P.O. Box 555 401 East Old City Johnson Hwy. Jefferson City, TN 37760

Manual 7583

Model no.: 25PT10C121 Chassis no.: 25F8 First Publish: 10-9-2000 Rev. Date: 3-21-2001 Print Date: 4/12/2003

Troubleshooting

REFER TO SAFETY GUIDELINES

CAUTION: USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING

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Page 98

Philips Consumer Electronics

Technical Service Data

Service Solutions Group Technical Publications Dept. P.O. Box 555 401 East Old City Johnson Hwy. Jefferson City, TN 37760

Manual 7583

Model no.: 25PT10C121 Chassis no.: 25F8 First Publish: 10-9-2000 Rev. Date: 3-21-2001 Print Date: 4/12/2003

Important Information

REFER TO SAFETY GUIDELINES

CAUTION: USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING

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Page 99

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PHILIPS 25PT10C121 Technical Service

Specifications and Main Features

Frequently Asked Questions

User Manual