Hitachi pa0139 schematic

+,7$&+,

No. 0139

27UX01B-501

SERVICE MANUAL

27UX01B-511

NA8 CHASSISNTSC

R/C:

CLU-432UG

CAUTION: Before servicing this chassis, it is important that the service technician read the “Safety

Precaution” and “Product Safety Notices” in this Service Manual.

This television will display television Closed

Captioning ( or ) in accordance

with paragraph 15.119 of the FCC rules.

CONTENTS

SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

PRODUCT SAFETY NOTICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

POWER SOURCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

SERVICE NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

CIRCUITS AND BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . 34

PARTS IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

SOLID STATE COLOR TELEVISION

JUNE 2000 HHEA-MANUFACTURING DIVISION

SAFETY PRECAUTIONS

NOTICE: Comply with all cautions and safety-related

notes located on or inside the cabinet and on the chasis or picture tube.

WARNING: Since the chasis of this receiver is connected to one side of the AC power supply during operation, whenever the receiver is plugged in, service shoul d not be attempted by anyone unfamiliar with the precautions necessary when working on this type of receiver.

The following precautions should be observed:

1. Do not install, remove, or handle the picture tube in any manner unless shatterproof goggles are worn. People not so equipped should be kept away from the picture tube while handling.

2. When service is required, an isolation transformer should be inserted between power line and the receiver

before any service is performed on a “HOT” chassis receiver.

3. When replacing a chassis in the receiver, all protective devices must be put back in place, such as barriers, nonmetallic knobs, adjustment and compartment covershields, isolation resistors, capacitors, etc.

4. When service is required, observe the original lead dress in the high voltage circuitry area.

Leakage Current Hot Check

Plug the AC cord directly into a 120V AC 60Hz outlet (do not use an isolated transformer for this check). Turn the AC power ON. Using a Leakage Current Tester (Simpson’s Model 229 or equivalent), measure for current from all exposed metal parts of the cabinet (antennas, screwheads, overlays, control shafts, etc.). Any current measured must not exceed 0.5 milliamps.

(READING

SHOULD NOT BE

ABOVE 0.5mA)

DEVICE UNDER

TEST

EXPOSED METAL

2-WIRE CORD

ALSO TEST WITH PLUG REVERSED (USING AC ADAPTER PLUG AS REQUIRED)

TEST ALL

SURFACES

LEAKAGE

CURRENT

TESTER

EARTH

GROUND

5. Always use the manufacturer’s replacement components. Critical components as indicated on the circuit diagram should not be replaced by another manufacturer’s. Furthermore, where a short circuit has occurred, replace those components that indicate evidence of overheating.

6. Before returning a serviced receiver to the customer, the service technician must thoroughly test the unit to be certain that it is completely safe to operate without danger of electrical shock, and be sure that no protective device built into the receiver has become defective, or inadvertently defeated during servicing.

Therefore, the following checks should be performed for the continued protection of the customer and service technician.

Leakage Current Cold Check

With the AC plug removed from the 120V AC 60Hz source, place a jumper across the two plug prongs. Turn the AC power switch ON. Using an insulation tester (DC500V), connect one lead to the jumpered AC plug and touch the other lead to each exposed metal part (antennas, screwheads, metal overlays, control shafts, etc.), particularly any exposed metal part having a return path to the chassis should have a minimum resistor reading of

0.24MΩ and a maximum resistor reading of 12MΩ. Any

resistance value below or above this range indicates an abnormality which requires corrective action. An exposed metal part not having a return path to the chassis will indicate an open circuit.

AC LEAKAGE TEST ANY MEASUREMENTS NOT WITHIN THE LIMITS

OUTLINED ABOVE ARE INDICATIVE OF A POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED BEFORE RETURNING THE RECEIVER TO THE CUSTOMER.

High voltage

This receiver is provided with a hol d down circuit for clearly indicating that voltage has increased in excess of a predetermined value. Comply with all notes described in this service manual regarding this hold down circuit when servicing, so that this hold down circuit is operated correctly.

Serviceman Warning

With minimum BRIGHTNESS, CONTRAST, SHARPNESS, and COLOR, the operating high voltage in this receiver is lower than 28.30kV ±1.25kV. In case any component having influence on the high voltage is replaced, confirm that high voltage with minimum BRIGHTNESS, CONTRAST, SHARPNESS, and COLOR is lower than 28.30kV ±1.25kV. To measure high voltage use a High Impedance High Voltage meter. Connect (-) to chassis earth and (+) to the CRT ANODE button. (See the connection diagram on page 4.)

Note: Turn power switch OFF without fail before the connection to the Anode Button

- 2 -

Important Safety Notice . . . . . . . . . . . . . . . . . . 2

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

Product Safety Notice . . . . . . . . . . . . . . . . . . . . 4

Horizontal Oscillator Disable Circuit . . . . 5

Receiver Feature Table . . . . . . . . . . . . . . . . . . . 6

Location of Controls (Receiver)

Receiver Front Control Panel . . . . . . . . . 7

Location of Controls (Remote). . . . . . . . . . . . . 8

Disassembly for Service. . . . . . . . . . . . . . . . . 15

Disassembly for CRT Replacement . . . . . . . . 15

Chassis Service Adjustment Procedures . . . 16

131.0V B+ Voltage Confirmation . . . . . 16

Source Voltage Chart . . . . . . . . . . . . . . 16

B+ 5V Source Voltages. . . . . . . . . . . . . 16

MPU 5V . . . . . . . . . . . . . . . . . . . . . . . . 16

Stand-by 5V . . . . . . . . . . . . . . . . . . . . . 16

B+ 9V Source Voltage . . . . . . . . . . . . . 16

B+ 12V (Stand-by) . . . . . . . . . . . . . . . . 16

High Voltage Check . . . . . . . . . . . . . . . 16

Purity and Convergence Procedures . . . . . . 17

Service Adjustments

(Electronic Control). . . . . . . . . . . . . . . . . . 30

Sub-Brightness. . . . . . . . . . . . . . . . . . . 30

Sub-Contrast. . . . . . . . . . . . . . . . . . . . . 30

Tint/Color Adjustment . . . . . . . . . . . . . . 30

Color Temperature Adjustment. . . . . . . 31

Horizontal Centering. . . . . . . . . . . . . . . 32

MTS Circuit Adjustment . . . . . . . . . . . . 32

Clock Adjustment (S7) . . . . . . . . . . . . . 33

Vertical Size . . . . . . . . . . . . . . . . . . . . . 33

Service Adjustments

(Mechanical Controls). . . . . . . . . . . . . . . . 33

Focus (Part of T551). . . . . . . . . . . . . . . 33

Audio Signal Path Block Diagram . . . . . . . . . 34

Video-Chroma Signal Path

Block Diagrams. . . . . . . . . . . . . . . . . . . . . 35

IC101 VCJ IN/OUT Pins and Functions . . . . . 36

IC001 MPU IN/OUT Pins and Functions. . . . . 37

Component Identification . . . . . . . . . . . . . . . . 38

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Serviceman Mode (Electronic Controls) . . . . 20

Entering Serviceman Mode . . . . . . . . . 20

Toggle between Modes. . . . . . . . . . . . . 20

Exiting the Serviceman Mode. . . . . . . . 20

Sub-Data Adjustment . . . . . . . . . . . . . . 21

Cut-Off Adjustment. . . . . . . . . . . . . . . . 21

Pin Cushion Adjustment . . . . . . . . . . . . 22

MTS Adjustment. . . . . . . . . . . . . . . . . . 22

PIP Adjustment. . . . . . . . . . . . . . . . . . . 23

Options Adjustment . . . . . . . . . . . . . . . 24

Comb Filter Adustment. . . . . . . . . . . . . 25

To Check Purity . . . . . . . . . . . . . . . . . . 26

Helpful Hints . . . . . . . . . . . . . . . . . . . . . 26

Instructional Flow Chart

for Serviceman Mode . . . . . . . . . . . . . . . . 27

- 3 -

PRODUCT SAFETY NOTICE

HIGH

IMPEDANCE

H.V. METER

CRT ANODE

CHASSIS GROUND

CRT

Many electrical and mechanical parts in HITACHI television receivers have special safety-related characteristics. These are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in this Service manual.

Electrical components having such features are identified with a mark in the schematics and parts list in this

Service Manual. The use of a substitute replacement component which

does not have the same safety characteristics as the HITACHI recommended replacement component, shown in the parts list in this Service Manual, may create shock, fire, X-radiation, or other hazards.

Production safety is continuously under review and new instructions are issued from time to time. For the latest information, always consult the current HITACHI Service Manual. [A subscription to, or additional copies of HITACHI Service Manuals may be obtained at a nominal charge from HITACHI Sales Corporation.]

This Service Manual is intended for qualified service technicians; it is not meant for the casual do-it-yourselfer. Qualified technicians have the necessary test equipment and tools, and have been trained to properly and safely repair complex products such as those covered by this manual. Improperly performed repairs can adversely affect the safety and reliability of the product and may void warranty. Consumers should not risk trying to do the necessary repairs and should refer to a qualified service technician.

WARNING

Lead in solder used in this product is listed by the California Health and Welfare agency as a known reproductive toxicant which may cause birth defects or other reproductive harm (California Health and Safety Code, Section 25249.5).

When servicing or handling circuit boards and other components which contain lead in solder, avoid unprotected skin contact with solder. Al so, when soldering do not inhale any smoke or fumes produced.

SAFETY NOTICE

USE ISOLATION TRANSFORMER

WHEN SERVICING

X-Radiation

TUBE: The primary source of X-Radiation in this receiver

is the picture tube. The tube utilized in this chassis is specially constructed to limit X-Radiation emissions. For continued X-Radiation protection, the replacement tube must be the same type as the original HITACHI-approved type.

When troubleshooting and making test measurements in a receiver with excessive high voltage problem, avoid being unnecessarily close to the picture tube and high voltage components.

Components having special safety characteristics identified by on the parts list in this service manual and

its supplements and bulletins. Before servicing this product, it is important that the service technician read and

follow the “Safety Precautions” and the “Product Safety Notices” in this Service Manual.

For continued X-Radiation protection, replace picture tube with original type or HITACHI equivalent type.

POWER SOURCE

This television receiver is designed to operate on 120Volt/ 60Hz, AC house current. Insert the power cord into a 120Volts/60Hz outlet.

NEVER CONNECT THE TV TO OTHER THAN THE SPECIFIED VOLTAGE OR TO DIRECT CURRENT.

Do not operate the chassis longer than is necessary to locate the cause of excessive voltage.

- 4 -

Service Notes

IMPORTANT: To protect against possible damage to

the solid state devices due to arcing or static discharge, make certain that all gro und wires and CRT DAG wire are securely connected.

Equipment needed to check the disabled circuit:

1. Voltmeter (0 - 200V scale)

2. High Voltage Meter (0- 50kV)

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 equipmen t or to the chassis. Connect the test equipment to the proper ground ( ) or

( ) when servicing, or incorrect voltages will be measured.

WARNING: This Receiver has been designed to mee t 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 s ymbol must be replaced with identical parts. Order parts from

the manufacturer’s parts center using the parts numbers shown in t his service manual, or provide the chassis number and the part reference number.

For optimum performanc e and reli ability, all other parts should be replaced with components of identical specification.

on the schematic

Horizontal Oscillator Disable Circuit

3. Variac or Isolation Transformer

Procedure:

1. Tune in a station to verify that the horizontal is

in sync.

2. Obtain a Monoscope pattern or a signal generator

crosshatch pattern

3. Turn the Receiver OFF. Connect a jumper across

IC803 pin 3 and pin 4. Apply +9V DC to cathode of

D001.

4. Reduce the AC supply voltage to approximately

45V. Connect the high voltage meter to the CRT

anode. (H.V. button).

Note: Use the Dag Ground (C10 on the CRT Board)

to connect the (-) lead of the meter.

5. Turn the Receiver ON. Slowly increase the AC

supply voltage and verify that the high voltages

does not exceed 37.1kV, when horizontal just

begins to pull ou t of sync . If the hig h voltage is not

within the specified limit, the cause must be

determined and corrected before the Receiver is

returned to the customer.

This chassis employs a special circuit to protect against excessive high voltage and beam current. If, for any reason, the high voltage and beam current e xc ee d a predetermined level this protective circuit activates and detunes the horizontal oscillator that limits the high voltage. The over-voltage protection circuit is not adjustable. However, if components indicated by the

symbol sweep system or the over-voltage protection circuit itself are changed, the operation of the circuit should be checked using the following procedure:

on the schematic in either the horizontal

- 5 -

Receiver Feature Table

FEATURE\MODEL

Chassis NA8 Tuning system 96K # of channels 181 Menu language Eng/Span/Fr Closed Caption X V-Chip X 75 Ω input X Picture in Picture 2T Remote Model # HL01423 Picture tube M68LGLO61X V/A norm (X=both) X MTS/SAP/DBX X Volume Correction X Built-in audio power 5Wx2 (10%) # of speakers 2 A/V in (rear/front) 3(2/1) Dimensions mm

(HxWxD) in

27UX01B-501 27UX01B-511

594.8x665.2x544.5

23.4x26.1x21.4

Weight (kg/lbs) 38/83.6 Power source (V/Hz) 120/60 Anode voltage

Video input jack Audio input jack 500mV RMS 47kΩ A-Board TNP2AH017 AE C-Board TNP2AA047 AP S-Board TNPA0190 AL Y-Board TNPA1059 BC

28.30kV ±1.25kV

75Ω, phon o jack

p-p

Table 1. Receiver Features

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

- 6 -

Location of Controls (Receiver)

1 2 3 4 5 6

Figure 1. Location of Controls Receiver

Quick Reference Control Operation

Quick Reference

Control Operation

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

Menus, and select operating features when menus are displayed

Channel Buttons - Press to selec t programmed c hannels. Pres s to highlight de sired

features when menus are displayed.

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

Adjustment Menus.

Input Button - Press to select TV or one of two Video Inputs.

AV Input - AV and earphone jacks.

- 7 -

Location of Controls (Remote )

Power Button

Press to turn ON or OFF.

PIP Buttons

Press to control PIP features.

PIP CH Buttons

Press to select PIP channels.

Menu Button

Press to display main menu and access or exit onscreen features and adjustment menus.

Mute Button

Press to mute audio (Closed Caption appears, if available). A second press resumes audio (Closed Caption will not be displayed).

V olume Buttons

Press to adjust TV audio level.

Mode Buttons

Set remote to control your TV, cable box, satellite dish, DVD or VCR.

TV/VCR Button

When controlling t he TV or VCR, this switches TV/VCR. When controlling cable, this switche between A and B.

Cursor Button

Press to adjust audio menus, video menus and select operati ng features.

Exit Button

Press to exit selection and adjusting menus.

Lst-Ch (Last Channel) Button

Press to switch to the previous channel.

Channel Button

Press to select channels.

Keypad Buttons

Press desired channel number to randomly access any channel.

Input Button

Press to select TV or video input.

CLU- 432UG

Figure 2. Location of Controls (Remote)

- 8 -

Sleep Button

Press to turn TV off in 30, 60 or 9 minutes.

Precoded VCR/DVD Buttons

These buttons transmit th chosen precoded VCR/DVD codes.

Remote Control Quick Reference Functional Key Chart

POWER

PIP CH

Key Operates Function

TV VCR DVD CABLE SATELLITE

T urns On and Off selected components

CBL/SAT

VCR/DVD

PIP

SWAP

MOVE

FREEZE

TV/VCR

TV TV mode selection for remote control

CABLE SATELLITE

VCR DVD

Cable mode selection for remote control Satellite mode selection for remote control

VCR mode selection for remote control DVD mode selection for remote control

Displays the PIP frame, press button once more, and PIP frame becomes smaller

TV Switches PIP and Main picture source

Moves the PIP frame to one of four corners of Main picture

TV Freezes the PIP picture

TV Selects channels for the PIP frame

TV VCR CABLE

Selects TV or VCR mode Selects TV or VCR mode Selects A/B

EXIT

LST-CH

MUTE

VOL

Menu navigation

TV Access and Exits menus

TV Exits selection and adjusting menus

TV Returns to previous channel

TV Mutes TV Audio

TV Volume up/down

- 9 -

Key Operates Function (Continued)

1 4 7

2 5 8

3 6 9

KEYPAD BUTTONS

CABLE/ SATELLITE

Channel up/down for main picture Channel up/down

INPUT

SLEEP

VCR DVD CABLE/ SATELLITE

TV Selects input mode

TV Selects SLEEP timer menu

VCR DVD

Selects channel

Selects channel Selects channel

Rewind

Play

Fast forward

REC

RECALL

VCR DVD

Record

Stop

Pause

Not used for this model

Displays channel, time, channel I.D. and audio mode

- 10 -

Programming the Remote

VCR Functions

This remote is design ed to operate different brands of VCRs. You must first program the remo te to match the remote system of your VCR.

Procedure

1. Turn ON your VCR.

2. Aim the remote control at the front of your VCR.

3. While holding down the VCR bu tton on the remote, enter the 2-digit preset code that matches your VCR.

(See “Component Code s” on page 12~ page 14.) The rem ote will turn off your VCR wh en the correct 2 digit preset code is entered. When this occurs, the remote control is programmed for your VCR. If the VCR does not turn off after 25 seconds, try a different code, if available.

4. The remote will now control your VCR.

Notes

• If yo ur VCR will not operate remotely after per forming the above procedures, this m eans that your VCR’s code has not been coded into the remote. Please consult your VCR’s operating guide.

• The remote control will remember the codes you have programmed in until the batteries are removed from the remote control. After replacing the batteries repeat the programming procedure stated above.

• If your VCR does not have a remote power function, the remote will issue the CHANNEL UP function.

•The MENU button will act as the VCR MENU button for HITACHI VCRs.

•The INPUT button will act as your VCR +100 button, if required.

Cable/Satellite Box Functions

This remote is designed t o opera te di fferent bran ds of cab le boxes and Satellite boxes. You must first program the remote to match the remote system in your cable/satellite box.

Procedure

1. Turn ON your cable/satellite box.

2. Aim the remote control at the front of your cable/satellite box.

3. While holding do wn the CABLE button on the remote, en ter the 2 digit preset code (See “C omponent Codes” on page 12 ~ page 14) that matches your cable/s atellite box. The remote wil l turn off your cable/ satellite box when the correct 2 digit code is entered. When this occurs, the remote control is programmed for your cable/satel lite box. If the ca ble/satellite box does not turn off after 5 secon ds, try another 2 digi t preset code, if available.

4. The remote will now control your cable/satellite box.

Notes

• If your cable/satellite box will not operate remotely after performing the above procedures, this means

that your cable/satel lite box code has not bee n coded into the remo te. Please consult your cable/ satellite box operating guide.

• The remote control will remember the codes you have programmed in until the batteries are removed

from the remote control. After replacing the batteries, repeat the entire programming procedure stated above.

• If your cable/satellite box does not have a remote power function, the remote will issue the CHANNEL

UP function.

Write the code numbers from tables in this space. This will serve as a reference if you need to program your remote control.

CABLE/SATELLITE BOX VCR

- 11 -

Component Codes

The remote control is capable of operating many brands of VCRs and cable/satellite boxes. You must first program the remote control to match the remote system in your VCR or cable/satellite box.

Some models of VCRs or cable/satellite boxes may not remotely operate because the codes are not available due to limited memory. The remote control is not designed to control all features that are available in all models.

VCR

Brand Code

Adventura 00 Aiko 50 Aiwa 00 Akai 14, 23, 49 American High 09 Asha 48 Audiovox 10 Beaumark 48 Bell & Howell 30 Brandt 38 Broksonic 33, 37, 43, 51, 52 Calix 10 Canon 09 Capehart 05 Carver 28 CCE 27, 50 Citizen 10, 50 Colt 27 Craig 10, 19, 27, 48 Curtis Mathes 09, 14, 22 Cybernex 48 Daewoo 03, 05, 17, 29, 50 Dayton 05 Dynatech 00 Electrohome 10 Electrophonic 10 Emerex 06

Emerson Fisher 19, 21, 25, 30

Fuji 07, 09 Funai 00 Garrard 00 GE 09, 22, 24, 39 Goldstar 04, 10, 11 Gradiente 00 Harley Davidson 00 Harmon/Kardon 11 Harwood 27 Headquarter 18 HI-Q 19 Hitachi 14, 15, 24, 31 Jensen 14

00, 01, 10, 16, 23, 33, 37, 40, 41, 43, 44, 50, 51, 52,

Brand Code

JVC 02, 14, 26 KEC 10, 50 Kenwood 11, 14, 26 KLH 27 Kodak 9, 10 Lloyd 00

Lloyd’s 40 Logik 27 LXI 10 Magnavox 09, 12, 28, 32, 34 Magnin 48 Marantz 09, 28 Marta 10 Matsushita 09 MEI 09 Memorex 00, 09, 10, 12, 18, 19, 20, 30, 48 MGA 16, 23 MGN T echnology 48 Minolta 15, 23 Mitsubishi 16, 23, 26, 36, 49 Motorola 09, 20 MTC 00, 48 Multitech 00, 27 NEC 11, 13, 14, 26, 30 Nikko 10 Noblex 48 Olympus 09, 47 Optimus 10, 20, 30 Orion 51 Panasonic 09, 35, 46, 47, 53 J.C. Penney 09, 10, 11, 13, 15, 21, 48 Pentax 15, 24, 31 Philco 09 Philips 09, 28, 32 Pilot 10 Pioneer 26 Portland 05 Portec 27 Pulsar 12 Quarter 18 Quartz 18 Quasar 09 Radio Shack 00, 10

- 12 -

Brand Code

Radix 10 Randex 10 RCA 15, 22, 24, 31, 34, 39 Realistic 00, 09, 10, 18, 19, 20, 25, 30, 48 Ricoh 08 Runco 12 Samsung 17, 48 Sanky 12, 20 Sansui 14, 26 Sanyo 18, 19, 30, 48 Scott 16, 17, 33, 37, 43, 44 Sears 09, 10, 15, 18, 19, 21, 25, 30, 31 Sharp 20 Shintom 27 Shogun 48 Singer 27 Sony 06, 07, 08, 09 STS 15 Sylvania 00, 09, 16, 28, 32

Symphonic 00 Tatung 14 Teac 00, 14 Technics 09, 35 Teknika 09, 35 Telefunken 00, 09,10 TMK 38 Toshiba 40, 48 Totevision 16, 17, 25, 44 Unitech 10, 48 Vector 48 Vector Research 17 Video Concepts 11, 13 Videosonic 13, 17, 23 Wards 00, 09, 15, 19, 20, 22, 27, 34, 44, 48 XR-1000 27, 34, 44, 48 Yamaha 11 Zenith 07, 08, 12

SATELLITE

Brand Code

General Instrument

Jerrold 61, 62 Primestar 61, 62 RCA 60 Sony 63

Brand Code

Hitachi 00 Megatron 00

Brand Code

ABC 01, 03, 05, 06, 09, 11, 12, 14, 30 Antronix 44 Archer 28, 40, 44 Belcor 31 Cable Star 31 Century 40 Citizen 40 Colour Voice 19, 25 Comtronics 29, 34 Contec 15

CABLE BOX

Brand Code

Dae Ryung 06 Eastern 02 Electricord 37 Everquest 13 Focus 57 Garrard 40 GC Electronics 31, 44 Gemini 13, 32, 36, 46

General Instrument/

09, 51

- 13 -

Brand Code

Goldstar 29, 39 Hamlin 08, 16, 27, 49, 50 Hitachi 09 Hytex 05 Jasco 40 Jerrold 03, 09, 10, 12, 13, 30, 51 Macom 26 Magnavox 21 Memorex 00 Movie Time 35, 37, 42 NSC 35, 36, 42 Oak 05, 15, 47 Panasonic 00,17, 38 Paragon 00 Philips 19, 21, 22, 23, 24, 25, 40, 46, 54 Pioneer 18, 39, 65 Popular

Mechanics Pulsar 00 RCA 17 Realistic 44 Recoton 57 Regal 16, 49, 50, 53 Regency 02 Rembrandt 09, 36 Runco 00

Samsung 29, 39 Scientific Atlanta 04, 06, 14, 52 Signal 13, 29 Signature 09 SL Marx 29 Sprucer 17, 55 Starcom 03, 13, 30 Stargate 13, 29 Starquest 13 Starsight 58, 59 Sylvania 01 Teleview 29 Texscan 01 Tocom 10, 11, 33 Toshiba 00 Tusa 13 TV86 35 Unika 40, 44 United Artists 05 United Cable 03 Universal 28, 31, 37, 40, 43, 44 Videoway 48 Viewstar 21, 34, 35, 45 Zenith 00, 64 Zentek 57

- 14 -

Disassembly for Service

Disassembly for CRT

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 app lication; various models are covered in this Manual. Us e same hardware when reassembling the receiver.

• 3 screws at the top edge of the Receiver.

• 1 screw at each lower corner of the Receiver.

• 1 screw by the retainer plate of the AC power cord.

• 1 screw by the Flyback assembly.

• 1 screw by the A/V jacks.

• 1 screw by the VAO OUT jacks.

A-Board - Main Chassis

1. Slide the chassis completely out of the guide rails.

2. Stand the Receiver on its edge. The underside o f the board is completely accessible for component replacement.

Note: Some tie-wraps that s ecure the wire dressi ngs

may need to be unfastened for chassis removal.

C-Board - CRT Output

Plugs into the socket on the CRT neck.

Y-Board - PIP Processing

Plugs into the A-Board.

S-Board - Second Tuner

Slides into left side of chassis.

Speakers

Each speaker is secured to the cabinet’s front with 4 screws.

Keyboard Push Button Assembly

Fastened to the inside of the cabinet front with up to 3 screws.

Replacement

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

2. Disconnect the yoke (DY) plug, degaussing coil (DEG) plug and the CRT 2nd anode button from the main board.

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

4. Disconnect the A11, A12, and Speakers plugs from the A-Board.

5. Lift the Main Chassis (A-Board) and all mounted boards completely out with the CRT Board attached.

CRT Replacement

1. Perform Disassembly for CRT Replacement procedure.

2. Insure that the CRT H.V. Anode button is discharged before handling the CRT. Read the Safety Precautions (see page 2) on handling the picture tube.

3. Remove the components from the CRT neck and place the cabinet face down on a soft pad.

4. Note the original order for the CRT mounting hardware as they are removed from the CRT mounting brackets at each corner of the CRT.

5. Remove the CRT with the dega ussing co il and th e dag ground braid attached.

6. Note the original locations and mounting of the degaussing coil and the dag ground assembly to insure proper reinstallation on the replacement CRT.

To remove and re-mount the degaussing coil:

The degaussing co il is held in place by clampers fastened to the CRT corner ears. These c lampers must be installed onto th e replacement CRT prior to mounting the degaussing coil.

To remove and re-mount the dag ground braid:

a. Unhook the coil spring from the bottom corners

of the CRT ears.

b. Releas e the braid loop fr om the upper corne rs

of the CRT ears.

7. Mount the dag ground braid on the replacement CRT. Position the degaussing coil with new ties. Dress coil as was on the original CRT.

8. Replace the components on CRT neck and re-install into cabinet. Verify that all ground wires and circuit board plugs get connected.

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Chassis Service Adjustment Procedures

All service adjustments are factory preset and should not require adjustment unless controls and/or associated components are replaced.

Note: Connect the (-) lead of the voltmeter to the appropriate ground. Use IC803’ s heat sink when the HOT ground

symbol ( ) is used. Otherwise, use COLD ground ( ) — Tuner shield, IC451’s heat sink or FA2.

IC 002

A31

A32

IC 6501

IC 001

164

32 33

A11

152

T U N E R

26 27

FA1

DAT A

TP15

CLK

FA2

IC 101

IC 551

IC 552

IC 2302

Figure 3. A-Board Main Components and Test Points

IC 4402

A61

IC 2321

A-BOARD

COLD ( )

HOT ( )

RL801

F801

IC 803

C552

TPD9

TPD8

IC 451

Q501

C809

FOCUS SCREEN

Q551

D554

Viewed from the trace side (bottom of the circuit board) MOMENTARILY CONNECT A JUMPER FOR ENTERING SERVICE MODE (FA1 to FA2 )

131.0V B+ Voltage Confirmation

1. Set the Bright and the Picture to Minimum by using the Picture Menu.

2. Connect the DVM between C809(+ sid e) and cold ground ( ).

3. Confirm that B+ voltage is 131.0V ± 2.5V. This voltage supplies B+ to the Horizontal Output & Flyback circuits.

Source Voltage Chart

120V AC line input. Se t the Bright and the Picture to Minimum by using th e Picture Menu. Use cold ground

(

) for the (-) lead of the DVM.

C572 (+) +5.0V ± 0.25V

TPD9 +13.0V ± 2V C552(+) +8.0V ± 1V TPD8 +27.4V ± 2V IC551 pin3 +9.0V ± 0.5V Cathode of D554 +220.0V ± 5V

Adjust Picture Menu for normalized video adjustments.

MPU 5V:

Emitter Q002 = IC001 (VDD, AVDD).

Stand-by 5V:

IC001 (key in 1), I2C EEPROM (IC002), Remote Receiver.

B+ 9V Source Voltage

IC551 pin 3 = IC101 (IF 9V), Tuner (BM).

B+ 12V (Stand- by)

Note: +16V when power is on

Cathode D001 = RL801 (on-off relay), Q002 (+5V Reg).

High Voltage Check

1. Select an active TV channel and confirm that horizontal is in sync.

2. Adjust Brightness and Picture using Picture Icon menu so video just disappears.

3. Confirm B+ 131V is within limit.

4. Using a high voltage meter confirm that the High Voltage is

28.30kV ±1.25kV .

B+ 5V Source Voltages Volatile 5V:

C572, + side = IC552 pin 3, Tuner BP, IC101 (IF 5V).

- 16 -

Purity and Convergence Procedure

Adjustment is necessary only if the CRT or the deflection yoke is replaced or if the setting was disturbed. The complete procedure consists of:

1. Vertical Raster Shift Adjustment. (Only for Models

with Purity/Convergence Assembly with 4 Pairs of Rings).

2. Initial static convergence.

3. Setting the purity.

4. Final static convergence.

When the CRT or the Yoke is Replaced

Place the yoke on the CRT neck (do not tighten the clamp).

For a 2-piece assembly (see Fig. 4):

Position purity/convergence assembly as shown and tighten clamp snugly. Remove the hot-melt glue seal on assembly and position like tabs of purity device

together at 12 o’clock to reduce its magnetic field effect.

R&B Convergence Rings

R&B&G Convergence Rings

G3 G4

Purity Rings Centered

Over G3/G4 Gap

For a 1-piece assembly (see Fig. 7):

Position like tabs of purity devices together at 12

o’clock to reduce any magnetic field effect. (For better results, note part number and loo k for specifi cations at Service Center)

Figure 7. Positioning of Purity/Convergence

Assembly (1-piece assembly)

For either assemblies:

Turn the Receiver ON. Operate the Receiver for 60 minutes using the first Purity Check field (white screen) to stabilize the CRT.

Fully degauss the Receiver by using an external degaussing coil .

Slide the deflecti on yoke bac k and forth on the nec k of the CRT until it produces a near white, uniform raster.

Figure 4. Positioning of Purity/Convergence Assembly

(2-piece assembly)

For models using 4 pairs of rings, place the vertical

raster shift tabs at 3 o’clock (90

from the purity and

convergence tabs, see Fig. 5 and Fig. 6)

R&B Convergence Rings

R&B&G Convergence Rings

Vertical Raster Shift Ring

G3 G4

Purity Rings Centered Over G3/G4 Gap

Figure 5. Positioning of Purity/Convergence Assembly

(4 Pairs of Rings)

R&B&G Convergence Rings

R&B Convergence Rings

Vertical Raster

Shift Rings

Purity Rings

Figure 6. Positioning of Purity/Convergence Assembly

(4 Pairs of Rings)

Vertical Raster Shift Adjustment (Only for

Models with Purity/Convergence Assembly with 4 Pairs of Rings).

Apply a green pattern wi th a horizontal line, a djust the Deflection Yoke so that has no tilt, then secure it. Adjust center line of the pattern with the mechanical center of the CRT, this center is determined by two marks at the side edges of the screen. To adjust the line, once the vertical raster shift tabs are place at 3 o’clock to reduce its magnetic field effect (see Fig. 5 and Fig. 6) open the tabs the same angle from the center, until the center line of the pattern becomes a straight line, ce ntered with the mar ks of the CRT. (see Fig. 8)

Center line

from pattern

Mechanical

Center Marks

Vertical Raster Shift tabs

Figure 8. Vertical Raster Shift Adjustment

(4 pairs of rings assembly)

Open the same angle

from center

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