Zenith ZP94, ZP95 Service Manual

2000 C-Li ne Projecti on TV

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ZENITH ELECTRONICS CO R PORAT I O N 201 JAMES RECORD ROAD HUNTSVILLE, AL. 35824

CONTENTS

Safety Information ........................................................................................................ 1

General Information ........................................................................................................ 5

Service Menus ........................................................................................................ 8

Convergence Setup ........................................................................................................ 15

Circuit Descriptions ........................................................................................................ 28

Troubleshooting ........................................................................................................ 90

PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO-VIDEO PRODUCTS

IMPORTANT SAFETY NOTICE

This manual was prepaired for use only by proporly trained audio-visual service technicians.

When servicing this product, under no circumstances should the original design be modified or altered without permission from Zenith Electronics Corporation. All components should be replaced only with types identical to those in the original circuit and their physical location, wiring and lead dress must conform to original layout upon completion of repairs.

Special components are also used to prevent x-radiation, shock and fire hazard. These components are indicated by the letter x included in their component designators and are required to maintain safe performance. No deviations are allowed without prior approval by Zenith Electronics Corporation.

Circuit diagrams may occasionally differ from the actual circuit used. This way, implementation of the latest safety and performance improvement changes into the set is not delayed until the new service literature is printed.

Caution: Do not attempt to modify this product in any way. Never perform customized installations without manufacturers approval. Unauthorized modifications will not only void the warranty, but may lead to property damage or user injury.

Service work should be performed only after you are thoroughly familiar with these safety checks and servicing guidelines.

Graphic symbols

The exclamation point within an equilateral triangle is intended to alert the service personnel to important safety information in the service literature.

The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the service personnel to the presence of noninsulated dangerous voltage that may be of sufficient magnitude to constitute a risk of electric shock.

The pictorial representation of a fuse and its rating within an equilateral triangle is intended to convey to the service personnel the following fuse replacement caution notice: CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF

SERVICE INFORMATION

While servicing, use an isolation transformer for protection from AC line shock. After the original service problem has been corrected, make a check of the following:

FIRE AND SHOCK HAZARD

1. Be sure that all components are positioned to avoid a possibility of

2. Verify that all protective devices such as insulators, barriers, covers,

3. Soldering must be inspected to discover possible cold solder joints,

4. Check for physical evidence of damage or deterioration to parts and

5. No lead or component should touch a receiving tube or a resistor rated at

6. After re-assembly of the set, always perform an AC leakage test on all

FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND RATING AS MARKED NEAR EACH FUSE.

adjacent component shorts. This is especially important on items transported to and from the repair shop.

shields, strain reliefs, power supply cords, and other hardware have been reinstalled per the original design. Be sure that the safety purpose of the `polarized line plug has not been defeated.

solder splashes, or sharp solder points. Be certain to remove all loose foreign particles.

components, for frayed leads or damaged insulation (including the AC cord), and replace if necessary.

1 watt or more. Lead tension around protruding metal surfaces must be avoided.

exposed metallic parts of the cabinet (the channel selector knobs, antenna terminals, handle and screws) to be sure that set is safe to operate without danger of electrical shock. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS TEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivity in the following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by a .15 mfd 150V AC type capacitor between a known good earth ground (water pipe, conduit, etc.) and the exposed metallic parts, one at a time. Measure the AC voltage across the combination of 1500 ohm resistor and .15 mfd capacitor. Reverse the AC plug by using a nonpolarized adaptor and repeat AC voltage measurements for each exposed metallic part. Voltage measured must not exceed 0.75 volts RMS. This corresponds to 0.5 milliamp AC. Any value exceeding this limit constitutes a potential shock hazard and must be corrected immediately.

PRODUCT SAFETY

A.C. VOLTMETER

Good earth ground

0.15uf

such as a water

pipe, conduit, etc.

1500 Ohm

10 Watt

X-RADIATION

1. Be sure procedures and instructions to all service personnel cover the subject of x-radiation. The only potential source of x-rays in current TV receivers is the picture tube. However, this tube does not emit x-rays when the HV is at the factory-specified level. The proper value is given in the applicable schematic. Operation at higher voltages may cause a failure of the picture tube or highvoltage supply and, under certain circumstances, may produce radiation in excess of desirable levels.

2. Only factory-specified CRT anode connectors must be used.

3. It is essential that the service personnel have available an accurate and reliable high-voltage meter.

4. When the high-voltage circuitry is operating properly, there is no possibility of an x-radiation problem. Every time a color chassis is serviced, the brightness should be run up and down while monitoring the high voltage with a meter, to be certain that the high voltage does not exceed the specified value and that it is regulating correctly.

5. When troubleshooting and making test measurements in a product with a problem of excessively high voltage, avoid being unnecessarily close to the picture tube and the high voltage power supply. Do not operate the product longer than necessary to locate the cause of excessive voltage.

6. Refer to HV, B+, and shutdown adjustment procedures described in the appropriate schematics and diagrams (where used).

IMPLOSION

1. All direct view picture tubes are equipped with an integral implosion protection system; take care to avoid damage during installation.

2. Use only the recommended factory replacement tubes.

TIPS ON PROPER INSTALLATION

1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting shelf space over, or close to, a heat duct, or in the path of heated air flow.

2. Avoid conditions of high humidity such as: outdoor patio installations where dew is a factor, near steam radiators where steam leakage is a factor, etc.

3. Avoid placement where draperies may obstruct venting. The customer should also avoid the use of decorative scarves or other coverings that might obstruct ventilation.

4. Wall- and shelf-mounted installations using a commercial mounting kit must follow the factory-approved mounting instructions. A product mounted to a shelf or platform must retain its original feet (or the equivalent thickness in spacers) to provide adequate air flow across the bottom. Bolts or screws used for fasteners must not touch any parts or wiring. Perform leakage tests on customized installations.

5. Caution customers against mounting a product on a sloping shelf or in a tilted position, unless the receiver is properly secured.

6. A product on a roll-about cart should be stable in its mounting to the cart. Caution the customer on the hazards of trying to roll a cart with small casters across thresholds or deep pile carpets.

7. Caution customers against using a cart or stand that has not been listed by Underwriters Laboratories, Inc. for use with its specific model of television receiver or generically approved for use with TVs of the same or larger screen size.

8. Caution customers against using extension cords. Explain that a forest of extensions, sprouting from a single outlet, can lead to disastrous consequences to home and family.

Place this probe on each exposed

metal part

PRODUCT SAFTEY

CHASSIS HIGH VOLTAGE ADJUSTMENT PROCEDURE

1. Connect High Voltage meter to FBT High Voltage output. Connect Ground of High Voltage meter to CRT Ground or FBT Ground.

2. Check that the High Voltage adjustment VR (RH44) is set to its mechanical center on the Deflection PWB. This VR is located just behind the Flyback transformer as viewed from the Front of the set. (See diagram below)

3. Receive an NTSC generator signal. (Picture should be stationary for this adjustment.

4. Video Controls should be set to Factor Settings.

5. Adjust the High Voltage to the following specifications by turning RH44 slowly.

6. Lock Paint the control. If available.

TH01

Checking Procedure :

1. Check that the picture is turned off and the horizontal deflection circuit stops operation. After Checking:

1. Unplug set and Remove Jig. Allow set to remain in the off condition for at least 15 seconds.

2. Apply AC and confirm the set returns to normal operation.

CH30

+50V Pulse

DH24

RH54

RH55

Add JIG to check Hi

Volt Limit Ci r c uit

JIG = 1k ohm 1/8W

DH31

FBT

RH44

High Voltage ADJ.

CHASSIS HIGH VOLTAGE LIMITER CHECK

Check Preparation:

1. The set can face any direction.

2. Receive the Cross-Hatch Signal

3. VIDEO CONTROLS: Brightness to Maxi- mum.

4. SCREEN FORMAT: Should be PROGRES- SIVE mode.

5. Attach the JIG (1k ohm 1/8W resistor) to both ends of DH31 as shown in the diagram below. (See Diagram)

CHASSIS FLYBACK PROTECTION CIRCUIT CHECK

Check Preparation:

1. The set can face any direction.

2. Receive the Cross-Hatch Signal

3. VIDEO CONTROLS: Factory Preset.

4. SCREEN FORMAT: Should be PROGRES- SIVE mode.

5. Attach a 100 K ohm 1/16W ~ 1/8W resistor between QP02 base and Gnd. (SD4 connector Pin 4) and check operation. After Checking:

1. Unplug set and Remove Jig. Allow set to remain in the off condition for at least 15 seconds.

2. Apply AC and confirm the set returns to normal operation.

CHASSIS SWEEP LOSS DETECTION CIRCUIT CHECK

Check Preparation:

Check Number (1):

1. The set can face any direction. 2 Receive the Cross-Hatch Signal

3. VIDEO CONTROLS: Factory Preset.

4. SCREEN FORMAT: Should be PRO- GRESSIVE mode.

5. Attach the JIG (A) (100 ohm 1/8W resistor) to right hand side of RN01 and to Ground as shown in the diagram below.

Check Number (2):

1. The set can face any direction.

2. Receive the Cross-Hatch Signal

3. VIDEO CONTROLS: Factory Preset.

4. SCREEN FORMAT: Should be PRO- GRESSIVE mode.

5. Attach the JIG (B) (100 ohm 1/8W resistor) to right hand side of RN11 and to Ground as shown in the diagram below.

PRODUCT SAFETY

Checking Procedure :

1. Check that the picture is turned off in either check.

After Checking:

1. Remove Jig after each check.

2. Confirm the set returns to normal operation.

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PRODUCT SAFTEY

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Perform the following when the HV connector (anode connector) is removed or inserted for CPT replacement, etc.

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3. Remove the connector slowly by pulling it away from the case.

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During Insertion

1. Please refer to direction for insertion as shown in Fig. B (L position). Insert connector until CLICK sound is heard.

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2. Make sure the connector is pressed right in, so that it has a good contact with the spring.

3. Confirm the contact by pulling the connector slightly. (Dont pull hard because it may damage

During Removal

1. Roll out silicon cover from FBTs contact area slowly.

2. While turning the connector about 90 de-

the connector).

4. Cover the high voltage output by carefully pushing silicon boot onto it. (Dont turn the connector).

grees following the arrow (0 position). Push the connector slightly toward the case. (Fig. A)

Note: Make sure the silicon boot is covering the

high voltage output.

GENERAL INFORMATION

SPECIFICATIONS FOR IQB-94/95 SERIES MODELS

Model:

Cathode-Ray Tu be :

Power Input Power

Consumption: Antenna

Impedence: Receiving

Channel:

Interm ediate Freque ncy:

Video Input:

Video O utput:

IQC50H94/95 IQC60H94/95

R = P 16LFM00RFA(LU) G = P16LFM00HHA(LU) Max Output - 2 4 Watt B = P 16LFM00BMB(EU) 120 Volt AC, 6OHz 224/232 Watts - Maximum 192/206 Watts Operating 75ohm Unbalanced VFH / UHF / CAT V

BAND VHF 2-13 UHF 14-69 Height 52 60 1/2 EXT. Mid (A-5)~(A-1),4+ Width 43 1/2 51 1/2 CATV Mid A~I Depth 23 1/2 26 1/2 CATV Super J~W Weight 190 308 CAT V Hyper (W+1) (W+28) Power Supply P.W.B. C.P.T. (B) P.W.B Picture I-F Carrier 45.75 MHz VM P.W.B C.P.T . (G) P.W.B. Sound I-F Carrier 41.25 MHz Surround P.W.B C.P.T . (R) P.W.B. Color Sub Carrier 42.17 MHz Signal P.W.B. Power/Deflection P.W.B. 1 Volt p-p, 75 Ohm Audio Out P.W.B. Control P.W.B. 1 Volt p-p, 75 Ohm (Y) 2H P.W.B Terminal P.W.B

07. Volt p - p , 7 5 Ohm, ( Cb, Cr) Sensor Dist P.W .B. Sub Deflectio n P. W.B. 1 Volt p-p, 75 Ohm

CH (12cm) Round

Audio Input:

Stereo Audio Output: Audio O utput P ower:

Anode Vo ltage: Brightness

Ful l W hi te 50"

Brig htnes s Max 60" Speakers:

Dimension:

Circuit Board Assemblies:

Size

470 mVrms, 47 k Ohm

470 mVrms, 1 k Ohm Front- 12 Watt at 10% distortion, 8 Ohm Imp.

30.0 +

1.5kv (1.25 + 0.2ma) ZP94 ZP95

130 130

100 100

2 woofers - 5 Inch

50" Series Models

60" Series Models

GENERAL INFORMATION

General Information

In 2000 Zenith will introduce a new C line of Digital Ready Projection TVs. This new line will help move Zenith forward with its goal to be the Digital Leader in consumer electronic products and reaffirm its continued commitment to supply innovative and high quality products to our customers. In this manual we will discuss the new features and designs incorporated in the new chassis line and newly designed cabinets in an effort to enable our ASCs to offer better service to our customers in the event that they require service on their Zenith product.

The new C line ZP chassis family will be broken down into service modules as follows: Power/ Deflection P.W.B., Main Chassis (Signal P.W.B.), Signal Sub. P.W.B., VM P.W.B. Jack Pack and SP Matrix (Audio) P.W.B. module. The new Projection TV line will continue to be supported to the modular level, which means that the repairs to these units will be done by properly diagnosing a defective module and replacing it. Since the Projection TV line will be supported to the modular level there will be no need to get prior approval from Tech Support for defective module replacement.

Remote Access

When using the MBR for customer menus, it must be placed in the TV mode (by pressing the TV button at the top). The customer menu is a bar of ICONS at the top of the customer menu display. By pressing the menu key you can select which menu to use. Use of the Up/Down small arrows allows the sub menu or feature item to be selected. To adjust or change a feature selection you use the Left/Right small arrows. Pressing the enter key usually allows you to exit the customer menu.

figure 1>>

Video Performance

Mechanical features include a Delta 78 lens system, single piece Fresnel screen with special cut of the front and back to add in distortion reduction when moving from one viewing position to another. The screen also incorporates vertical black strip matrixing which gives an increased contrast ratio. Finally the set comes with the tinted screen protector already installed to prevent damage to the screen. (scratches and cracks)

Electrical Features include a 3 line comb filter for processing incoming signals to provide fine detail images. Auto skin tone circuitry automatically maintains natural skin tones. Black level enhancement, white level, and peak white level compression circuitry maintains black/white contrast ratio and peak luminance level for detail in both light and dark video areas. All these features work together to provide a resolution level of 1000 lines on the ZP94/95 series.

MBR3475Z

924-10068

GENERAL INFORMATION

SOURCE

EXIT

TV / VIDEO

Source Selector

AUDIO TO HI-FI

-VOLUME+

To Converter

ANT A

ANT B

-CHANNEL+

POWER

<<figure 2. Control Panel>>

S-VIDEO

VIDEO

(MONO)

AUDIO

INPUT 1

S-VIDEO

VIDEO

(MONO)

BCB

PRC

AUDIO INPUT 2

PRC

DIGITAL

SETUP

DIGITAL CONVERGENCE

SETS ONLY

S-VIDEO

VIDEO

(MONO)

BCB

AUDIO

MONITOR

OUT

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<<figure 3 Rear Connection Panel>>

SERVICE MENUS

Service Menu Access

To access the service menu on the ZP94/95 series;

1. Press and hold the SOURCE button on the user control panel at the front of the set.

2. While holding the SOURCE button, press the POWER button on the user control panel at the front of the set to activate the service menu.

3. Receive signal on main picture.

4. Check the service menu items according to the following tables, using the up and down buttons on Remote Control.

5. Press MENU key to exit service menu adjustment mode.

NOTE:

1. If there is a different value than shown in table above, for fixed data, adjust it using buttons (only

in this case).

2. When exchanging microprocessor and TV is turned on for first time, it requires initialization of

VIDEO CHROMA ADJ on P1 to P6.

SERVICE MENUS

ITEM S ETTING

P01 ZP94/95 ADJUST MODE Ve r sion 704

SUB BRT 3C-C3 Sub Brightness SERVI CE 0 SERVICE

DEF RESET 0 V/P RESET 0 3DYC RESET 0 FLEX RESET 0 DSP RESET 0 CCD RESET 0 FACT RESET 0 Resets Memory MEMORY INITIAL 0 Resets Memory

P02 ZP94/95 ADJUST MODE

TA1300 31.5khz M 315 H POSI 40 00-7F Horizontal Position FLEX CONT VD POS 3F 00-7F Vertical Position UPD64081 DYGA 09 00-0F Y Motion Detection Gain DCGA 06 00-0F Chroma Motion Detection Gain VAPGA 00 00-07 Vertical Aperture Co ntrole Gain VAPIN 00 00- 1F Vertical Aperture Controle Invert YHCOR 00 00- 01 Y Outp ut High Frequency Coring P02 ZP94/95 ADJUST MODE

RANGE DESCRIPTION

*Non-Adjustable Data

TA1300 33.75kh z M 3375 H POSI 40 00-7F Horizontal Position FLEX CONT VD POS 3F 00-7F Vertical Position UPD64081 DYGA 09 00-0F Y Motion Detection Gain DCGA 06 00-0F Chroma Motion Detection Gain VAPGA 00 00-07 Vertical Aperture Co ntrole Gain VAPIN 00 00- 1F Vertical Aperture Controle Invert YHCOR 00 00- 01 Y Outp ut High Frequency Coring

P03 ZP94/95 ADJUST MODE

TA1270-M TINT (TV) 3C 00-7F Main NTSC Tint TOFFO (TV) 00 00-07 Main NTSC TOF fO Peak Frequency Switch TOFQ (TV) 00 0 0- 07 Main NTSC TOFQ Switch SUB CNT 0F 00-1F Main NTSC Contrast SUB CL 1B 00-1F Main NTSC Color P03 ZP94/95 ADJUST MODE

TA1270-S TINT (TV) 3C 00-7F Main NTSC Tint TOFFO (TV) 00 00-07 Main NTSC TOF fO Peak Frequency Switch TOFQ (TV) 00 0 0- 07 Main NTSC TOFQ Switch SUB CNT 0F 00-1F Main NTSC Contrast SUB CLR 1B 00-1F Mai n NT SC Color

SERVICE MENUS

ITEM S ETTIN G

P04 ZP94/95 FLEX CONT NTSC 39 HHPF1 00 00-01 Characteristic Switch 0 = Low Frequency, 1 = High Frequency 41 V-CRG 00 00-03 Vertical Enhance Coring 42 H-CRG 00 00-03 Horizontal Enhance Coring 43 V-ENH 00 00-03 Vertical Enhance 44 H-ENH 00 00-03 Horizontal Enhance 96 YVHENH 0B 00-1F Y Vertical & Horizontal Enhance Gain 100 CVHENH 12 00-1F Color Vertical & Horizontal Enhance Gain P04 ZP94/95 FLEX CONT ATSC (480i, 480p, 1080i, 720p) 39 HHPF1 00 00-01 Characteristic Switch 0 = Low Frequency, 1 = High Frequency 41 V-CRG 00 00-03 Vertical Enhance Coring 42 H-CRG 00 00-03 Horizontal Enhance Coring 43 V-ENH 00 00-03 Vertical Enhance 44 H-ENH 00 00-03 Horizontal Enhance 96 YVHENH (720p 00 (10) 00 -1F Y Vertical & Horizontal Enhance Gain 100 CVHENH 12 00-1F Color Vertical & Horizontal Enhance Gain

P05 ZP94/95 FLEX CONT NTSC 71 YV-ENH 00 00-0F Y Vertical Enhance Gain 79 CV-ENH 00 00- 0F Color Vertical Enhance Gain 87 YH-ENH 07 0 0-0F Y Hor izontal En hance Gain 94 CH-ENH 0F 00-0F Color Horizontal Enhance Gain 66 YV-DSB 00 00-03 Y Vertical Dynamic Shoot Balance Gain 75 CV-DSB 00 00-03 Color Vertical Dynamic Shoot Balance Gain 82 YH-DSB 00 00-03 Y Ho rizontal Dynamic Shoot Balance Gain 90 CH-DSB 00 00-03 Color Horizontal Dynamic Shoot Balance Gain 69 YV-CLP 00 00-0F Y Vertical Enhance Clip Offset 84 YH-CLP 00 00-0F Y Hor izontal Enhance Clip Of fset P05 ZP94/95 FLEX CONT ATSC (480i, 480p, 1080i, 720p) 71 YV-ENH 00 00-0F Y Vertical Enhance Gain 79 CV-ENH 00 00- 0F Color Vertical Enhance Gain 87 YH-ENH (1080i 07 (00) 00- 0F Y Horizontal Enhance Gain 94 CH-ENH 0F 00-0F Color Horizontal Enhance Gain 66 YV-DSB 00 00-03 Y Vertical Dynamic Shoot Balance Gain 75 CV-DSB 00 00-03 Color Vertical Dynamic Shoot Balance Gain 82 YH-DSB 00 00-03 Y Ho rizontal Dynamic Shoot Balance Gain 90 CH-DSB 00 00-03 Color Horizontal Dynamic Shoot Balance Gain 69 YV-CLP 00 00-0F Y Vertical Enhance Clip Offset 84 YH-CLP 00 00-0F Y Hor izontal Enhance Clip Of fset

P06 ZP94/95 FLEX CONT NTSC 97 YV-NLP 00 00-3 F Y Vertical Nonline ar Peak ing 98 YH-NLP 0 A 00-3F Y Ho rizon tal No nlinear Peaking 101 Y-LMT FF 0 0-FF Y Amplitude Limit 83 YH-FRQ 00 0 0-03 Y Horizo nt a l HPF P e a k Frequency Switch 91 CH-FRQ 02 00-03 Color Horizontal HPF Peak Frequency Switch 70 YV-LTI 00 00-01 Y Vertical Enhance Clip 0 = Enhance, 1 = LTI 78 CV-CTI 00 00-01 Color Vertical Enhance Clip 0 = CTI, 1 = Enhance 86 YH-LTI 01 00-01 Y Horizontal Enhance Clip 0 = Enhance, 1 = LTI 93 CH-CT I 01 0 0-01 Color Horizontal Enhance Clip 0 = CTI, 1 = Enhance

RANGE DE SCRIPTI ON

*Non-Adjustable Data

SERVICE MENUS

ITEM S ETTIN G

P06 ZP94/95 FLEX CONT ATSC (480 i, 480p, 1080i, 720p) 97 YV-NLP 00 00-3F Y Vertical Nonlinear Peaking 98 YH-NLP 0A 00-3F Y Horizontal Nonlinear Peaking 101 Y-LMT FF 00-FF Y Amplitude Limit 83 YH-FRQ 00 00-03 Y Horizontal HPF Peak Frequency Switch 91 CH-FRQ 02 00-03 Color Horizontal HPF Peak Frequency Switch 70 YV-LTI 00 00-01 Y Vertical Enhance Clip 0 = Enhance, 1 = LTI 78 CV-CTI 00 00-01 Color Vertical Enhance Clip 0 = CTI, 1 = Enhance 86 YH-LTI 01 00-01 Y Horizontal Enhance Clip 0 = Enhance, 1 = LTI 93 CH-CTI 01 00-01 Color Horizontal Enhance Clip 0 = CTI, 1 = Enhance

P07 ZP94/95 FLEX CONT NTSC 69 YVDSBC 00 0 0- 07 Y Vertical Dynamic Shoot Balance Coring Amplitude 77 CVDSBC 00 00-07 Color Vertical Dynamic Shoo t Balance Coring Amplitude 85 YHDSBC 00 00-07 Y Horizontal Dynamic Shoot Balance Coring Amplitude 92 CHDSBC 00 00-07 Color Horizontal Dynamic Shoot Balance Coring Amplitude 95 Y-CRG 00 00- 07 Y Coring Amplitude 99 C-CRG 00 00 -07 Color Cor in g Amplitude 64 YNR-IN 04 00-07 YNR Input L e vel Gain 73 CNR-IN 04 00-07 CNR Input Level Gain 80 YNRPAS 00 00-07 YNR Passage Level Limit 88 CNRPAS 02 00-07 CNR Passage Level Limit P07 ZP94/95 FLEX CONT ATSC (480i, 480p, 1080i, 720p) 69 YVDSBC 00 0 0- 07 Y Vertical Dynamic Shoot Balance Coring Amplitude 77 CVDSBC 00 00-07 Color Vertical Dynamic Shoo t Balance Coring Amplitude 85 YHDSBC 00 00-07 Y Horizontal Dynamic Shoot Balance Coring Amplitude 92 CHDSBC 00 00-07 Color Horizontal Dynamic Shoot Balance Coring Amplitude 95 Y-CRG 00 00- 07 Y Coring Amplitude 99 C-CRG 00 00 -07 Color Cor in g Amplitude 64 YNR-IN 04 00-07 YNR Input L e vel Gain 73 CNR-IN 04 00-07 CNR Input Level Gain 80 YNRPAS 00 00-07 YNR Passage Level Limit 88 CNRPAS 02 00-07 CNR Passage Level Limit

P08 ZP94/95 FLEX CONT NTSC/ATSC (480i, 480p, 1080i, 720p) 65 YNRRDC 00 0 0-07 YNR Reducing Gain 74 CNRRDC 00 00-07 CNR Reducing Gain 67 YNR-DC 00 0 0-03 YNR DC Shif t 76 CNR-DC 00 00-03 Color DC Shift 81 YNR-O 00 00-0 7 YNR 0 Po int 89 CNR-O 00 00- 0F CNR 0 Point 45 CB-BLK 07 00-0F CB Blanking Level Offset 46 CR-BLK 07 00-0F CR Blanking Level Offset 27 FRMBRT* 60 00-7F Y Frame Bright 102 CLPOUT 7F 00-FF Clamp Output Offset

P09 ZP94/95 FLEX CONT NTSC/ATSC 10 MPLL-S 0F 00-1F Main PLL Vertical Mask Pulse Start Position Offset 17 SPLL-S 0F 00-1F Sub PLL Vertical Mask Pulse Start Position Offset 12 MPLL-E 0F 00-1 F Main PLL Vertical Mask Pulse End Po sition Offset 19 SPLL-E 0F 00-1F Sub PLL Vertical Mask Pulse End Position Offset 11 M VW-PH 05 00-07 Ma in Vertical Wr ite I nput Horizont a l Phase Adjustment 18 SVW-PH 05 00-07 Sub Ve rti cal Write In put Horizontal Phase Adjust ment 14 MHS-HP 0F 00-1F Main Horizontal Sync Horizontal Phase Offset 21 SHS-HP 0F 00-1F Sub Horizonyal Sync Horizontal Phase Offset 13 MY-CLP 03 00-07 Main Y Clamp Refrence Offset 20 SY-CLP 03 00-07 Sub Y Clamp Refrence Offset

RANGE DE SCRIPTI ON

*Non-Adjustable Data

SERVICE MENUS

ITEM S ETTING

P10 ZP94/95 FLEX CONT NTSC/ATSC (480i, 480p, 1080i, 720p) 23 V-POS 3F 00-3F Wide Vertical Position 24 V-SIZ 7F 0 0-FF Wid e Vert ical Size 50 HD-POS 3F 00-7F HD Position Offset 48 VBLK-T 7F 00-FF Vertical Blanking Top P osition Offset 49 VBLK-B 7F 00-FF Vertical Blanking Bottom Position Offset 51 HBLK-R 7F 00-FF Horizontal Blanking Right Position Offset 52 HBLK-L 7F 00-FF Horizontal Blanking Left Position Offset 40 READ F 10 0 0- 3F A/D Converter Clock Sampling Phase P11 ZP94/95 FLEX CONT NTSC/ATSC (480i, 480p, 1080i, 720p) 35 FRMT OP -2 07 00-0F Frame Top Po sition Offset (2Pix) FRMTOP-L* 07 00-0F Frame Top Po sition Offset (Letter) 36 FRMBTM-2 07 00-0F Frame Bottom Po sition Offset (2Pix) FRMBTM-L* 07 00- 0 F Frame Bottom Position Offset (Letter) 37 FRMRGT 07 00-0F Frame Right Position Offset 38 FRMLFT 07 00- 0 F Frame Left Position Offset 59 BS-TOP 07 00-0F Black Strech Sto p Pulse Top Position Offset 60 BS-BTM 07 00-0F Black Strech Stop Pulse Bott om Position Offset 61 BS-RGT 07 00-0F Black Strech Stop Pulse Right Position Offset 62 BS-LFT 07 00-0F Black Strech Sto p Pulse Left Position Of fset P12 ZP94/95 FLEX CONT 120 TV/CINE 01 00-01 TV Cinema Detection 121 T /C DET 07 00- 0F TV Cinema Detection Vertical Gate Area Start Position 122 T /C UNL 01 00-07 TV Cinema Detection Unlock Prot ection Count 123 T /C LCK 03 00-0F TV Cinema Detection Lock Protection Count 126 T/C ARE 05 00-FF TV Cinema Detection Motion Area Border Volume Offset 127 T/C CBR 07 00-0F TV Cinema Detection Color 2 Bit Border Volume Offset 128 T/C YBR 07 00-0F TV Cinema Detection Y 2 Bit Border Volume

P13 ZP94/95 TA1298 NTSC SHARP 0C 00-1F Sharpness (Center Adjustment ) APACON 06 00 -07 APACON Peak fO YNR 00 00-03 YNR P13 ZP94/95 TA1298 4 80I SHARP 0A 00-1F Sharpness (Center Adjustment) APACON 06 00 -07 APACON Peak fO YNR 00 00-03 YNR P13 ZP94/95 TA1298 480P SHARP 0A 00-1F Sharpness (Center Adjustment) APACON 06 00 -07 APACON Peak fO YNR 00 00-03 YNR P13 ZP94/95 TA1298 1080I SHARP 07 0 0- 1F Sharpness (Center Adjustment ) APACON 05 00 -07 APACON Peak fO YNR 00 00-03 YNR P13 ZP94/95 TA1298 720P SHARP 0A 00-1F Sharpness (Center Adjustment) APACON 06 00 -07 APACON Peak fO YNR 00 00-03 YNR

RANGE DESCRIPTION

*Non-Adjustable Data

SERVICE MENUS

ITEM S ETTIN G

P14 ZP94/95 TA1298 NTSC COLOR 40 00-7F Color (Center Adjustment) T INT 45 00-7 F Tint (Center Adjustment) R-Y PH 02 00-03 R-Y Phase R/B GA 01 00-03 R/B Gain G-Y PH 00 00-03 G-Y Phase G/B GA 00 00-0 3 G/B Gain COLOR SYST EM 0 0 00 -07 COLOR SYST EM P14 ZP94/95 TA1298 SDTV COLOR 4F 00-7F Color (Center Adjustment) T INT 3B 00-7F Tint (Center Adjustment) R-Y PH 02 00-03 R-Y Phase R/B GA 02 00-03 R/B Gain G-Y PH 01 00-03 G-Y Phase G/B GA 00 00-0 3 G/B Gain COLOR SYST EM 0 1 00 -07 COLOR SYST EM P14 ZP94/95 TA1298 HDTV COLOR 40 00-7F Color (Center Adjustment) T INT 43 00-7 F Tint (Center Adjustment) R-Y PH 00 00-03 R-Y Phase R/B GA 02 00-03 R/B Gain G-Y PH 02 00-03 G-Y Phase G/B GA 00 00-0 3 G/B Gain COLOR SYST EM 0 1 00 -07 COLOR SYST EM

P15 ZP94/95 TA1298 RGB BRT 50 0 0-7F RGB Brightness RGB CNT 5 0 00 -7F RGB Contrast G D RV (W) 3 9 00- 7 F Green Drive (WAR M) B DRV (W) 2D 00-7F Blue Drive (WARM) SUB CLR 10 00-1F Sub Col or (Demodulato r) SUB CNT 1F 00-1F Main NTSC Contrast VSM PH 05 00- 07 VM Ph ase VSM GA 0 0 00-0 3 VM Gain OS ACL 01 00 -01 OSD Auto Cont r ast Limiter Switch RGB ACL 0 0 00 -01 RGB Auto Contrast Limi t er Swit ch P16 ZP94/95 TA1298 CLR G 00 00 -03 Color G Corection P iont CLT 00 00-01 Color Limiter Level YOUT G 00 0 0- 01 Y G (After Contrast) Switch YG PNT 00 00-01 Y G Point S TRK 00 00-03 Sharpness T racking RGBG 00 00-01 RGB Switch DC PNT 00 00-07 DC Restoration Point DC RAT 00 0 0-07 DC Restoration Rate DC LMT 00 0 0- 03 DC Restorat ion Limit Point

RANGE DE SCRIPTI ON

*Non-Adjustable Data

SERVICE MENUS

ITEM S ETTING

P17 ZP94/95 TA1298 BSP 03 00-07 Black Strech Point APL /BS 00 00 -03 APL / Black Strech Po int B COR 01 00- 01 Black Level Correction B GA 00 00-01 Black Strech Gain B DET 00 00-01 Black Detect Level DABL P N 00 00-07 Dynamic ABL Detection Point DABL GA 07 0 0-07 Dynamic ABL Gain ABL PN 0 7 00-07 ABL Detection Point A BL GA 05 0 0-07 AB L Gain P18 ZP94/95 V CHIP RAT ING POLLING 0F 00-0F 0 TIMEOUT 05 00-0F 0 ST AT US 02 0 0-0F 0

AFC/CLOCK TEST

RANGE DESCRIPTION

*Non-Adjustable Data

SERVICE ADJUSTMENT PROCEDURE ORDER

The following is the suggested order for adjustment procedures.

ZP 94/95 SERVICE ADJUSTMENT ORDER “PREHEAT BEFORE BEGINNING”

Order Adjustment Item Scre en Format Signal DCU Da ta

Pre HEAT N/A NTSC N/A 1 Cut Off Progressive NTSC 2 Pre Focus Lens and Static Progressive NTSC 3 DCU Phase Data Setting Progressive NTSC 4 DCU Phase Data Setting HD 2.14H 5 Horz. Position Adj. (Coarse) Progressive NTSC 6 Horz. Position Adj. (Coarse) HD 2.14H 7 Raster Tilt Progressi ve NTSC CLEAR 8 Beam Ali gnment Progressi ve NTS C 9 Raster Position Progressive NTSC CLEAR

Horz. Size Ad just Progressive NTSC CLEAR

Horz. Size Adjust HD 2.14 CLEAR

11 Vertical Size Adjust Progress ive NTSC CLEAR 12 Beam Form Progressive NTSC 13 Lens Focus Adjust Progressive NTSC 14 Static Focus Adjust Progressive NTSC 15 Blue Defocus Progressive NTSC 16 White Balance Adjustment Progres sive NTSC 1 7 Sub Bright ness Adjustment Progressive NTSC Color Bar 1 8 Horz. Position Adjustment Progressive NTSC 1 9 Horz. Position Adjustment HD 2.14H 2 0 Converge nce Alignment Progressive NTSC 21 C onver gence Al ignment HD 2.14H

I t is necessary to follow the order when per forming an alignment on the ZP 94/95 chassis.

CLEAR to star t

CONVERGENCE

MEMORY INITIALIZATION PROCEDURE

WARNING: This should only be done in extreme

cases. I2C Data will be reset as well. Be sure and write down all data values before continuing.

1. Disconnect Power to Television.

2. Remove the Back Cover.

3. Remove the two screws holding the Main chassis to the Cabinet if necessary.

4. Disconnect wiring harness clips to free up the chassis if necessary.

5. Reconnect Power to the Television and turn the set ON.

6. Locate PP1 and add a jumper between pins 1 and 2 of the PP1 connector.

7. Hold jumper in place for 5 seconds. (A beep will NOT be heard).

8. Remove the jumper.

9. Confirm EEPROM reset, Input source is now set to Air and not to Cable 1 or 2. No Child Lock, and only channels 2 through 13 are in memory.

10.Reassemble Chassis and reinstall PTV back. Set is now ready to operate.

NOTE: All customers' Auto Programming and

Set-Ups are returned to factory settings.

Pre HEAT

PRESET EACH ADJUSTMENT VR TO CONDI-

TION AS SHOWN:

A) Before Pre Heat Run.

1. Red and Green Drive VR on the CRT PWB. (Not

on Blue CRT).

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2. SCREEN VR ON FOCUS PACK.

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Pre Set fully counter clockwise.

3. Focus VR on focus pack

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Pre Set fully clockwise.

CUT OFF

ADJUSTMENT PREPARATION: A) Pre Heat Run should be finished. ADJUSTMENT PROCEDURE:

1. Go to I2C ADJ Mode. Press and hold the Source key on the front panel and then POWER ON to access I2C adjustment mode.

2. Choose SERVICE item [2] of I2C ADJ. Mode. (Select CURSOR RIGHT (right arrow key).

3. Screen VR should be turned clockwise gradually and set so that retrace lines begin to appear.

4. Return to normal mode by using the left arrow key.

5. Adjust focus VRs so that focus is even all around the screen.

PRE-FOCUS ADJUSTMENT Adjustment preparation

1. The set can face in any direction: west, east,

north or south.

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Pre set between the 12 oclock and 2 oclock position.

2. Receive the cross-hatch pattern signal.

CONTRAST : 60-70% BRIGHTNESS : 50%

3. The electrical focus adjustment should have been

completed.

4. The centering DY inclination should have been

adjusted.

CONVERGENCE

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Adjustment procedure

1. Loosen the fixing screw on the lens cylinder so that the lens cylinder can be turned. (Be careful not to loosen too much. If the screw is loosened too much, rattling when tightening becomes greater and the focus may drift). After completing steps (5), (6), and (7) below, tighten the fixing screws for each lens with a torque of 12~17 Kgf cm.

2. Apply covers to 2 of R, G, and B lenses, and project a single color on the screen and adjust in sequence.(The adjustment order of R, G, and B is only an example.)

3. For each of the R, G, and B lenses, observe the color aberration generated on the outer circumference of the cross-hatch bright line at the center section (3 pitches vertically and horizontally from the center.)

4. If the lens adjustment knob is turned clockwise, viewed from the front, the color aberration changes as follows.

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Set Size Pitch between L1 & L2

50" 3.0 cross-hatch pitches 55" 3.0 cross-hatch pitches 60" 3.0 cross-hatch pitches

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6. In case of R lens, set to the position where the chromatic aberration changes from red to crimson. As shown below, observe the vertical bright line at the center and set to the position where the crimson chromatic aberration slightly appears inside and red outside (reference value: 1~3mm) within the cross-hatch pitches specified in next

Lens Change of color aberration

R Lens Red Crimson G Lens Blue Red B Lens Purple Green

5. In case of G lens, set to the point where the chromatic aberration switches from blue to red. If the chromatic aberration appearing all over the screen is not the same, observe the vertical bright line at the center of the screen and set to the position where red chromatic aberration slightly appears inside and blue outside (reference value: 1~3mm) within the cross-hatch pitches specified in next table. When the red chromatic aberration appearing at both sides of the bright line is not equal, observe the side with larger chromatic aberration when adjusting.

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7. In case of B lens, set to the position where the chromatic aberration changes from purple to green. As shown below, observe the vertical bright line at the center and set to the position where green chromatic aberration slightly appears inside and purple outside (reference value: 1~3mm) within the cross-hatch pitches specified in next table.

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CONVERGENCE

Adjustment procedure PROGRESSIVE MODE

1. Receive any NTSC signal (Set is in Progressive mode)

2. Push SERVICE ONLY SW on Deflection PWB (Enter to DCU ADJ. Mode)

3. Push (?) key on R/C. (Green cross hatch is displayed). Then push (QUIT) key on R/C. (Character pattern is displayed. This is the PHASE setting mode)

4. Set PH-H phase data as shown below using (4) and (6) key.

5. Set PH-V phase data as shown below using (2) and (5) key.

6. Set CR-H phase data as shown below using (<) and (>) key.

7. Set CR-V phase data as shown below using (up) and (down) arrow keys.

8. Push (?) key on R/C to exit from the PHASE mode.

9. Push (-)* key on R/C 2 time to write the phase data to the E2PROM.

10.When Green dots are displayed, push (MUTE) key to return to DCU ADJ. mode.

11. Push SERIVCE ONLY SW to return to RF or VIDEO mode.

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3. Since the G light is very important for picture quality and performance, pay special attention in its adjustment.

NOTE: Be careful not to touch the lens with

your fingers when adjusting.

4. For red, setting to the center between red and crimson is optimum.

5. For blue, setting to the center between purple and green is optimum.

DCU PHASE DATA SETTINGS

Adjustment Preparation

1. Cut off adjustment should be finished

2. VIDEO CONTROL: Factory Preset Condition

HD MODE

12. Receive any HD signla (Set is in HD Mode)

13. Repeat (2)~(11) procedure again.

PROGRESSIVE MODE

PHASE MODE: PHASE MODE: PH-H: BB PH-V: OC CR-H: 4C CR-V: 00

HD MODE

PH-H: BB PH-V: O7 CR-H: 4C CR-V: 0C

CHASSIS HORIZ PHASE (COARSE) ADJUSTMENT

Adjustment Preparation:

1) Cut Off, DCU Phase adjustments should be finished.

2) Video Control: Brightness 90%, Contrast Max.

CONVERGENCE

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Adjustment Procedure PROGRESSIVE MODE

1) Receive any NTSC crosshair signal.

2) Screen Format is PROGRESSIVE.

3) Press the SERVICE ONLY switch on the de-

flection PWB and display the Digital Convergence Crosshatch pattern.

4) Mark the center of the Digital Convergence Cross-

hatch Pattern with finger and press the SERVICE ONLY switch to return to normal mode.

5) Enter the I2C Bus alignment menu and select Item [12] H POSI and adjust the data so that the cen- ter of Video matches the location of the Digital Crosshatch pattern noted in step {4}.

6) Exit from the I2C Menu.

HD Mode Adjustment

1) Receive any 2.14H signal.

2) Screen Format is HD.

RASTER INCLINATION ADJUSTMENT

(DEFLECTION YOKE)

Adjustment preparation

1. The set can face any direction.

2. Input the single cross test signal.

3. Set video conditions to factory reset.

4. The lens focus adjustment should have been completed, screen format should be progressive.

5. The electric focus should have been coarse adjusted.

6. The digital convergence RAM should be cleared (uncorrected state). With the TV set off, press and hold the service switch located on the Power/ Deflection PWB and then press the power button.

7. Start adjustment 20 minutes or more after TV is turned on.

3) Press the SERVICE ONLY switch on the de-

flection PWB and display the Digital Convergence Crosshatch pattern.

4) Mark the center of the Digital Convergence Cross-

hatch Pattern with finger and press the SERVICE ONLY switch to return to normal mode.

5) Enter the I2C Bus alignment menu and select Item [12] H POSI and adjust the data so that the cen- ter of Video matches the location of the Digital Crosshatch pattern noted in step {4}.

6) Exit from the I2C Menu.

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Adjustment procedure

1. Apply covers to the R and B lenses and project only green light or short 2P plug on R & B.

2. Turn the G deflection yoke and adjust the vertical raster inclination.

3. Then, remove the cover of R or B lens and project red or blue light together on the screen.

4. Turn the deflection yoke of R or B and set so that the inclination of R or B with respect to the green light is as shown below on the top and bottom sides.

5. After raster inclination adjustment, fixing screw of DY should be screwed with 12+2kg-cm torque.

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CONVERGENCE

Notes:

1. If internal cross-hatch does not appear after clearing RAM data, press service switch again, on POWER/DEFLECTION PWB.

2. To restore old RAM data, turn TV off and on.

BEAM ALIGNMENT Adjustment preparation

1. Adjust at least 30 minutes after turning on power switch.

2. Raster inclination, centering, horizontal and vertical amplitudes, and optical focus adjustment should be completed.

3. Set video conditions, Brightness to 90% and Contrast MAX.

4. Receive cross-hatch signals. (Use of internal cross-hatch signals allowed.) Raster Tilt should be finished.

5. Screen format should be Progressive.

Adjustment procedure

1. Green (G) tube beam alignment adjustment. Short-circuit 2P subminiature connector plug pins of Red (R) and Blue (B) on the CPT boards and project only Green (G) tube.

2. Put Green (G) tube beam alignment magnet to the cancel state as shown below.

6. If image position does not shift when Green (G) static focus (Focus Pack) is turned. Green (G) beam alignment has been completed.

7. If image position shifts when Green (G) static focus (Focus Pack) is turned, repeat (2)-(6).

8. Conduct beam alignment for Red (R) focus: Focus Pack UFPK, Blue (B) focus: Focus Pack UFPK.

9. Upon completion of adjustment, fix beam alignment magnets with white paint.

VERT & HORIZ PICTURE POSITION

ADJUSTMENT

Adjustment preparation

1. Select signal on main picture.

2. Video settings have to be at normal condition.

Adjustment procedure

1. Press the SOURCE and POWER button on Control Panel at same time to access VIDEO CHROMA ADJUST mode.

2. Select H POSI and V POSI using 56 buttons.

3. Adjust the H POSI (HORIZONTAL) and VPOSI (VERTICAL) position using 34 buttons.

4. Press MENU button to exit VIDEO CHROMA ADJUST mode.

5. Select single PINP mode and move the sub picture, using the MOVE button. Distance between PINP and edge of screen should be equal when moved. If it is not, repeat (1) ~ (5).

3. Turn the Green (G) static focus (Focus Pack) counterclockwise all the way and make sure of position of cross-hatch center on screen. (Halo state.)

4. Turn the Green (G) static focus (Focus Pack) clockwise all the way. (Blooming state.)

5. Turn two magnets forming alignment magnet in any desired direction and move cross-hatch center to position found in (3).

NOTE: For ZP94/95 Models check the position

of MULTI PINP mode. Check the right edge of the sub pictures for MV-4 to make sure there is no separation between the MULTI PINP and the edge of the screen.

HORIZONTAL SIZE

· Digital Convergence RAM should be cleared. With

Power Off, press and hold the Service Only Switch on the Deflection PWB, then press Power.

Adjustment Prerparation

1. The set can face east or west

CONVERGENCE

2. Set video conditions to factory preset.

3. The electric focus should have been coarse adjusted.

4. Start adjustment 20 minutes or more after TV is turned on.

Adjustment Procedure

PROGRESSIVE MODE

1. Receive any NTSC signal.

2. Press the SERVICE ONLY SW on DEFLECTION PWB.

3. Locate the horizontal size VR (R683). Adjustable the horizotal size to the table below.

HD MODE

1. Input 1080i (fH=33.75kHz) component signal to VIDEO 1 or 2.

2. Press the SERVICE ONLY SW on DEFLEC-

TION PWB.

3. Locate the horizontal size VR (R686). Adjustable the horizotal size to the following table.

Adjustment Prerparation

1. The set can face east or west

2. Set video conditions to factory preset.

3. The electric focus should have been coarse adjusted.

4. Start adjustment 20 minutes or more after TV is turned on.

Adjustment Procedure

PROGRESSIVE MODE

1. Receive any NTSC signal.

2. Press the SERVICE ONLY SW on DEFLECTION PWB.

3. Locate the vertical size VR (R630). Adjustable the vertical size according to the table below.

Size O

50" 670mm 60" 775mm

Adjust Vertical Size until the size matches the chart

below.

Size Progressive Mode HD Mode

50" 1050mm 1050mm 60" 1200mm 1200mm

Adjust Horizontal Size until the size matches the

chart below.

VERTICAL SIZE

· Digital Convergence RAM should be cleared.

With Power Off, press and hold the Service Only Switch on the Deflection PWB, then press Power.

BEAM FORM Adjustment preparation

1. The beam alignment should have been completed.

2. The raster inclination, centering, horizontal/ vertical amplitude and optical focus adjustments should have been completed.

3. Set video conditions to Brightness to 90 % andContrast to MAX.

4. Input the dot signal.

Adjustment procedure

1. Green CRT beam shape adjustment. Shortcircuit 2P sub-mini connectors on Red and Blue CRT P.W.B.s to project only the Green beam.

CONVERGENCE

2. Turn the green static focus fully clockwise. (Blooming.)

3. Make the dot at the screen center a true circle using the 4-pole magnet as shown below.

4. Also adjust the Red and Blue CRT beam shapes according to the steps (1) to (3).

5. After the adjustment has been completed, return R,G and B static VRs to the just focus point.

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8. Rotate the cylinder back and forth to obtain the best focus point, while observing the Cross-Hatch. (Observe the center of the screen).

Hint: Located just below the screen are the two

wooden panels. Remove the panels to allow access to the focus rings on the Lenses.

9. After completing optical focus, tighten the fixing screws for each lens.

10. When adjusting the Green Optical focus, be very careful. Green is the most dominant of the color guns and any error will be easily seen.

LENS FOCUS ADJUSTMENT

Preparation for adjustment

1. Receive the Cross-hatch pattern signal.

2. The electrical focus adjustment should have been completed.

3. Deflection Yoke tilt should have been adjusted.

4. Brightness = 50%

5. Contrast = 60% to 70%

Adjustment procedure

6. Short the 2 pin sub-miniature connector on the CRT P.W.B. TS, to produce only the color being adjusted and adjust one at a time. (The adjustment order of R, G and B is just an example.)

7. (See Figure below) Loosen the fixing screw on the lens assembly so that the lens cylinder can be turned. (Be careful not to loosen the screw too much, as this may cause movement of the lens cylinder when tightening.)

11. Repeat Electrical Focus if necessary.

STATIC FOCUS ADJUSTMENT Adjustment preparation

1. The lens focus should be finished.

2. Set video conditions to Contrast to MAX and birightness to 50%.

3. Receive the cross-hatch pattern signal.

4. Apply covers to the lenses of colors other than the color to be adjusted and project a single color.

Adjustment procedure

1. Red (R), Green (G) and Blue (B) static focus adjustment. Vary the static focus VR(focus pack UFPK) and make the center of the cross-hatch pattern clearest.

2. Observe the corners of the picture and check that the focus does not get conspicuously worse.

CONVERGENCE

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BLUE DEFOCUS ADJUSTMENT Adjustment preparation

1. Optical and electrical focus adjustment should have been completed.

2. The convergence adjustment should have been completed.

3. Set Video conditions to factory reset.

Adjustment procedure

1. Input a Crosshatch Signal to VIDEO input.

2. Short-circuit 2P sub-mini connectors on the red and green CPT P.W.B.s to display only the blue beam.

3. Turn the B Focus VR(Focus Pack) fully clockwise.

4. Adjust BLUE defocus according to the following

specifications. 1mm on each side equaling 2mm

total

See figure Below.

Blue Defocus “Sticking Out”

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WHITE BALANCE ADJUSTMENT

1. Screen adjustment

2. High brightness white balance

3. Low brightness balance

Screen Adjustment VRs Drive Adjustment VRs

Red: on Focus Pack Red: R873 on CPT P.W.B. Green: on Focus Pack Green: R842 on CPT P.W.B. Blue: on Focus Pack

Adjustment VRs: Screen adjustment VRs on Focus Block Drive adjustment VRs on CRT P.W.B. Red Drive = R829R Green Drive = R879G

Preparation for adjustment

1. Start adjustment 20 minutes or more after the power is turned on.

2. Turn the brightness and black level OSD to minimum by remote control.

3. Receive a tuner signal, (any channel, B/W would be best).

4. Set the drive adjustment VRs (Red R829R and Green R879G) to their mechanical centers.

Adjustment procedure

1. Go to I2C ADJ. Mode. (With power ON, press DTV/SAT and Cursor Down buttons at the same time. Service Menu is displayed.)

2. Choose SERVICE item Number [2] of I2C

Cent er of Blue crosshatch li ne

ADJ. Mode. (Select ON by Cursor Right and the Vertical will collapses).

3. Gradually turn the screen adjustment VRs (red, green, blue) clockwise and set them where the red, green and blue lines are equal and just barely visible.

CONVERGENCE

4. Return Service item on I2C ADJ to Off by

Cursor Right. Number [2].

Adjust the Sub Brightness Number [1]

SUBBRT using I

C Bus alignment procedure so only the slightest white portions of the raster can be seen.

5. Input a gray scale signal into any Video input and select that input using the INPUT button on the remote or front control panel.

6. Turn the Brightness and Contrast OSD all the way up.

7. Make the whites as white as possible using the drive adjustment VRs (Red R829 and Green R879).

8. Set the Brightness and Contrast to minimum. (10800 Kelvin)

9. Adjust the low brightness areas to black and white, using screen adjustment VRs (red, green, blue).

10. Check the high brightness whites again. If not OK, repeat steps 6 through 9.

11. Press the MENU key on remote to Exit Service Menu.

sure that the other conditions are center. Directly observe the screen by eye without using a mirror.

Fade to black

18 HORIZONTAL POSITION (FINE) Adjustment Preparation:

1. Video Control: Brightness 90%, Contrast Max. Adjustment Procedure

PROGRESSIVE MODE:

1. Receive any NTSC crosshatch signal.

2. Screen Format is PROGRESSIVE

SUB BRIGHTNESS ADJUSTMENT Adjustment preparation

1. Start adjustment 20 minutes or more after the

power is turned ON. Receive the color bar signal.

2. Set the contrast and color controls to minimum.

Adjustment procedure

1. Go to Sub Brightness adjustement in VIDEO

CHROMA ADJUST mode (press Source and Power button on Control panel at the same time), using 56 buttons and then 4 button.

2. Then adjust Sub Brightness using 34 buttons to

increase or decrease the value, according to figure. (Visually adjust).

3. After adjustment, press MENU button to exit

VIDEO CHROMA ADJUST mode. (Data is stored in memory).

NOTE: When selecting SUB-BRIGHTNESS

mode, the microprocessor sets the CONTRAST and COLOR to MIN. automatically, but make

3. Enter the I2C Bus alignment menu and select Item [12] HPOSI

4. Adjust the data so that the Left and Right hand side are equal.

5. Press the MENU button to exit from the Ser- vice Menu.

HD Mode Adjustment:

1. Receive any 2.14H 33.75kHZ signal.

2. Display Format is HD mode.

3. Enter the I2C Bus alignment menu and select Item [12] HPOSI

4. Adjust the data using the left and right cursor keys and balance the Left and Right hand side.

5. Press the MENU button to exit from the Ser- vice Menu.

DIGITAL CONVERGENCE ADJUSTMENT Adjustment preparation

1. Receive an RF or video signal.

2. Set controls to factory preset.

3. Install jig screen on the set.

CONVERGENCE

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4. Note the center of the video pattern displayed. This is necessary to match dotted lines (adjustment point viewed) and actual point that is adjusted and displayed by the video signal.

5. Press the service only switch (on POWER/ DEFLECTION PWB). The pattern displayed is now the digital convergence mode.

6. When performing a complete digital convergence adjustment CLEAR DATA in RAM. See 2.6 (1)(7).

7. To clear data turn TV set off. Press and hold the service switch and then press POWER on.

Press the MENU button to see all colors if the

center cross is other than White.

3. Press the Cursor Keys to match the selected color

to the green at the geometric center of the screen.

4. Press the RECALL, 0, or SOURCE buttons to

select the next color to be adjusted.

0= Red / Green (Yellow) SOURCE= Green / Blue (Cyan) DISPLAY= Green Only

5. Press Freeze button to exit the Raster Phase Mode.

(The two lines disappear)

6. Press SKO1 to exit Convergence Service Mode.

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NOTE: If only minor adjustments to conver-

gence are needed, the jig screen is not necessary. Use digital data stored in memory and one color as a reference(red,green or blue). DO NOT CLEAR DATA and WRITE to ROM memory.

Advanced convergence Adjustment Procedure

WARNING: Advanced Convergence Adjustment

Procedure is to be performed only when replacement of the Small Signal Main Module or one or more the the CRTs is replaced.

RASTER CENTERING

1. Press the service button SKO1 to enter the Convergence setup mode.

2. Press the FREEZE button to enter the Raster Phase Adjustment Mode. Two additional lines appear, one near the top, and one near the bottom of the screen.

CONVERGENCE 3X3 Green 3x3 Mode Alignment

1. Start with power off, press the service button SKO1

and hold, then press the front panel POWER button at the same time. Set should come on with misaligned convergence.

Note: Mis-aligned convergence will appear, DO

NOT ACTIVATE ROM WRITE (MOVE button twice). If you do so, you will save this un-adjusted convergence data.

2. Press DISPLAY button 5 times to access 3x3

Mode.

3. Press the MENU key to project the RED +

GREEN cross- hatch colors only. Then press DISPLAY to project the GREEN only.

4. Use the 2,4,5, and 6 keys (up, left, down, and right, respectively) to select the adjustment point. Start at center adjustment point, then move to top and bottom, then left and right, and finally the corners.

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5.Press the CURSOR KEYS at the selected adjustment point to match the GREEN horizontal and vertical lines to the Screen Jig lines.

(Call Zenith Parts @ 1-800-3-ZENITH to order

the Screen Jig)

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Red and Blue 3x3 Mode Alignment

6. Press the 0 key to project the RED + GREEN internal cross-hatch colors.

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Internal cross-hatch is Yellow when the Red and

Green lines match, and Cyan when the Blue and Green Match

7.Press the CURSOR KEYS at the selected adjustment point to match the RED horizontal/ vertical lines to the Green cross-hatch lines.

8. Press the SOURCE key to select the BLUE + GREEN cross-hatch colors. Perform step 7 for the BLUE.

9. Press the MENU button to display all 3 colors.

10. In order to Save settings (WRITE to ROM), press the MOVE key 2 times. When the data is stored Green dot will appear on the screen. Press MOVE once to continue with 7x5 adjustment mode.

CONVERGENCE 7X5 Green 7X5 Mode Alignment

1. Press the 0 button 5 times to enter the 7X5 Adjustment Mode.

2. Press the MENU button and then the DISPLAY button again to project the Green color only.

CONVERGENCE

G-Only Screen

3. Use the 2,4,5, and 6 keys (up, left, down, and right, respectively) to select the adjustment point. Start at center adjustment point, then move to top and bottom, then left and right, and finally the corners.

4.Press the CURSOR KEYS at the selected adjustment point to match the GREEN horizontal and vertical lines to the Screen Jig lines.

Red 7X5 Mode Alignment

5. Press the 0 key to select the RED + GREEN internal cross-hatch signal.

6. Repeat steps 3 and 4 for the Red 7X5 adjustment.

Blue 7X5 Mode Alignment

7. Press the SOURCE key to select the BLUE + GREEN colors.

8. Repeat steps 3 and 4 for the Blue 7X5 mode adjustments.

9. In order to Save settings (WRITE to ROM), press the MOVE key 2 times. When the data is stored Green dot will appear on the screen. Press MOVE once to continue with 13x9 adjustment mode.

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Yellow Cros s-h atch

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Magenta Cross-hatch

CONVERGENCE 13X9 Green 13X9 Mode Alignment

1. Press the SOURCE button 5 times to enter the 13X9 Mode.

2. Press the MENU button and then the DISPLAY button again to project the GREEN only.

CONVERGENCE

4.Press the CURSOR KEYS at the selected adjustment point to match the GREEN horizontal and vertical lines to the Screen Jig lines.

Red 13X9 Mode Alignment

5. Press the 0 key to select the RED + GREEN internal cross-hatch signals.

6. Repeat steps 3 and 4 for the Red 13X9 mode adjustments.

Red Alignment Yellow Cross-hatch

Blue Alignment Magenta Cross-hatch

Blue 13X9 Mode Alignment

7. Press the SOURCE key to select the BLUE + GREEN colors.

8. Repeat steps 3 and 4 for the Blue 13X9 mode adjustment.

9. In order to Save settings (WRITE to ROM), press the MOVE key 2 times. When the data is stored Green dot will appear on the screen. Hit MOVE to continue.

When complete, press the service mode button SKO1 to exit the Convergence setup mode.

DIGITAL CONVERGENCE REMOTE CONTROL

PHASE

BLUE

(13X9 ADJUSTMENT)

CONVERGENCE

AUXILLIARY

CURSOR UP

CURSOR LEFT

CURSOR DOWN

RED

(7X5 ADJUSTMENT)

REMOVE COLOR

INITIALIZE

CURSOR RIGHT ROM WRITE

GREEN (3X3 AD JUST MEN T)

ADJUSTMENT CROSSHATCH /

VIDEO MODE

RASTER POSITION

ROM READ

MBR3475Z

924-10092

CIRCUIT DESCRIPTION

Sub-Power Supply Circuit Description

Figure 1 is a simplified diagram of the main Power Supply used in the ZP94/95 series Projection Television Chassis. The primary control element of the power supply is I901 (the Switching Regulator IC), in conjunction with switching transformer T901. These two components, along with the supporting circuitry, comprise a closed loop regulation system. Unlike previous Pulse Width Modulated (PWM) Switch Mode Zenith power supplies, the regulation system in the this chassis utilizes Frequency Control Modulation with an operational frequency of 85KHZ to 100KHZ, corresponding to full load and no load conditions, respectively. Primary regulation is provided by Q902, I902 and Q910, regulating the switching frequency at pin (3) of I901 via pin 1, the regulation input to the IC.

B+ Generation for the Sub Power Supply Driver IC (see figure2) Vcc for the Driver IC is first generated by the AC input. This voltage is called Start-Up Voltage. I901 requires 21V DC to operate normal. However, it will begin operation at 14.5V DC on pin (4) of I901. When AC is applied, AC is routed through the main fuse F901 (a 5 Amp fuse), then through the Line filters L901, 902, 903 and 904 to prevent any internal high frequency radiation for radiating back into the AC power line. After passing the line filters it arrives at the bridge rectifier D901 where it is converted to Raw 150V DC voltage to be supplied to the power supply switching transformer T901 pin (1). However, one leg of the AC is routed to a half wave rectifier D902 where it is rectified, routed through R905 and R906 (both a 5.6K ohm resistor), filtered by C907, clamped by a 30V Zener D904 and made available to pin (4) of I901 as start up voltage. The Red LED D903 is illuminated by this power supply. When this voltage reaches

14.4Vdc, the internal Regulator of I901 is turned on and begins the operation of I901. When the power supply begins to operate by turning on and off the internal Switch MOSFET, the Raw 150V DC routed through T901 (in on pin 1 and out on pin 2), is connected to pin (3) of I901 which is the Drain. The Source of the internal Switch MOSFET is routed out of pin (2) through three low ohm resistors to hot ground. This on and off action causes the transformer to saturate building up the magnet field. When the internal Switch MOSFET turns off, the magnet field collapses and the EMF is coupled over to the secondary windings, as well as the drive windings. The drive windings at pin (8 and 9) produce a run voltage pulse which is rectified by D905, filtered by C908 then routed through R908, clamped by D904 and now becomes run voltage (22V) for I901.

I901

Switch

Mode

IC Reg

Raw 150V

T901

Switch Mode

3Drain

Q910

Buffer

Q914

SCR

Transformer

I902

Opti-Coupler

I903

Opti-Coupler

Q902

Buffer

Q905

SCR

28V

Shutdown

Input

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