Zenith C27A25 Service Manual
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Zenith C27A25 Service Manual

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SERVICE MANUAL
Product Type:
Chassis:
Manual Series: CM154
Manual Part #: 923-03487
Model Line:
Product Year:
201 James Record Road - Huntsville, Alabama 35824-1513
Printed in U.S.A.
Consumer Color TV
XC
E
2002
CONTENTS
General Info/Remotes .................................... 1
Factory Menu ................................................ 2
Servicing/Troublshooting ............................... 3
Model Part Lists ............................................ 4
Exploded Views ............................................. 5
Schematics/PCB Layouts ................................. 6
Published by Technical Publications
Zenith Electronics Corporation
Copyright
2002 by Zenith Electronics Corporation
Model Series:
C27A25
C27A25T6
C32A26
C32A26T6
C36A26
C36A26-8
C36A26T6
C36A26T6-8
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Summary of Contents for Zenith C27A25

  • Page 1 Servicing/Troublshooting ....... 3 Model Part Lists ..........4 Exploded Views ..........5 Schematics/PCB Layouts ......... 6 Published by Technical Publications Zenith Electronics Corporation 201 James Record Road - Huntsville, Alabama 35824-1513  Copyright 2002 by Zenith Electronics Corporation Printed in U.S.A.
  • Page 2 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.
  • Page 3 PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO-VIDEO PRODUCTS SHUTDOWN CIRCUIT THEORY OF OPERATION The Zener Diode’s function is to keep a constant voltage The HV shutdown network feeds the shutdown or X-ray on its terminals. Since the Zener is in series with the protection input, pin 29, of ICX2200 video processor ICX2200 (see the figure below) an excess of voltage will IC.
  • Page 4 PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO-VIDEO PRODUCTS SAFETY CIRCUIT TEST PROCEDURE SHUTDOWN CIRCUIT TEST Equipment required: Equipment required: a) K.V. DC meter (0 to 30 KV, high Z). a) K.V. DC meter (0 to 40 KV, high Z). b) Video Generator b) External variable power supply (0V to 8 VDC).

  • Page 5: Table Of Contents

    TABLE OF CONTENTS SECTION 1 ....OVERVIEW MODIFICATION ..........3-4 OVERVIEW ............. 1-1 SECTION 4 ......PARTS INTRODUCTION ..........1-1 MODEL PARTS ..........4-1 REMOTES ............1-2 COMPONENT PARTS LIST ........4-3 MBR3457T REMOTE CONTROL ......1-2 MBR3458T REMOTE CONTROL ......1-3 SECTION 5 ..
  • Page 6 - TOC-2 -...

  • Page 7: Section 1

    Feature and component information is listed below for each of the XC models. XC Chassis Model Information MODEL SCR CABINET JACKS MODULE REMOTE MICRO OP GUIDE MODULE LEVEL REPAIR 009-2165 124-00233-05 905-10525 206-03590 C27A25 TableTop 1 Tuner PIP TableTop 809-10551 124-00233-05 905-10660 206-03590 C27A25T6 1 Tuner PIP TableTop 124-00233-06 905-10528 206-03591 C32A26...

  • Page 8: Remotes

    REMOTES MBR3457T REMOTE CONTROL POWER Turns TV On or Off. FLASHBK (Flashback) Returns to previous Channel. MODE Selects the remote's mode of operation SURF MUTE Turns Surf Channel On/Off Turns sound Off and On while picture remains. VOLUME (Left/Right) CHANNEL (Up/Down) Increases TV’s sound level.

  • Page 9: Mbr3458T Remote Control

    MBR3458T REMOTE CONTROL POWER FLASHBK (Flashback) Turns TV On or Off. Returns to previous Channel. MODE Selects the remote's mode of operation SURF MUTE Turns Surf Channel On/Off Turns sound Off and On while picture remains. VOLUME (Left/Right) CHANNEL (Up/Down) Increases TV’s sound level.

  • Page 10: Remote Programming

    REMOTE PROGRAMMING PROGRAMMING INSTRUCTIONS CABLE BOX If you’re using Zenith products, the remote is already This remote can control the cable/converter box volume programmed for most common codes: TV = 101, VCR = and muting (instead of the TV’s) if available on your 201, CABLE = 353, and AUX = 401.
  • Page 11 Memorex Samsung 103, 119, 134, Zenith 101, 121, 142, 106, 107, 114, 149, 152, 177 116, 117, 161 Sanyo 108, 109, 118 Zenith Star Sight Audio CD Goldstar Sharp 441, 442 Harman/ Kardon Onkyo 430, 923, 924, Sherwood Hitachi Sony...
  • Page 12 Fisher 211, 212, 213, XR-1000 Saisho 278, 279, 280, 247, 265, 274 Yamaha 202, 218, 726 Salora 296, 297, 730 Funai Zenith 201, 224, 225, Samsung 220, 230, 238 229, 237 Panasonic Audio Tuner/Amp Victor Philips 475, 476 Yamaha Citizen...
  • Page 13 367, 510, 517 Sony DSS Zenith HD Set Top 385 Philips 325, 327, 347, General 304, 305, 306, Zenith N/C Set Top 384, 395 350, 352, 354, Sprucer Instrument 307, 308, 309, 355, 521 Zenith PM 310, 318, 504, Standard Comp 335...

  • Page 14: User Menus 905-10525

    USER MENUS 905-10525 905-10525 USER MENUS SET UP MENU When a channel is selected with the Surf key, the channel will be marked in the SURF option or it can be selecting The Setup Menu and all of the options for the XC Chassis in the Setup Menu.
  • Page 15 905-10525 USER MENUS (continued) TIME SET SET UP SET UP Use the Up/Down arrow keys to adjust the clock the desired Time Set option. EZ PROGRAM EZ CLOCK EZ CLOCK ADD/DEL/SURF EZ CLOCK CAPTIONS CAPTION/TEXT EZ MUTE LANGUAGE CLOCK MODE SOURCE/MENU TIME SET 12 : 00...

  • Page 16: Source Menu

    905-10525 USER MENUS (continued) SET UP SET UP SOURCE MENU SOURCE MENU EZ PROGRAM MAIN MENU ANTENNA/CABLE ADD/DEL/SURF PIP SOURCE VIDEO 1 EZ CLOCK VIDEO 2 CAPTIONS CAPTION/TEXT ENGLISH LANGUAGE SPANISH SOURCE/MENU FRENCH MOVE BACK MENU MOVE BACK MENU SOURCE MENU PIP SOURCE This menu has two items, Main Source and PIP Source.

  • Page 17: Audio Menu

    905-10525 USER MENUS (continued) BRIGHTNESS Note: If the program does not support Stereo, there the audio will output in mono. For adjusting this feature use Left/Right arrows keys. SOUNDRITE The brightness value sent to video processor is (RfBrt + Customer Brightness) if the source is on the RF source, The Sound Rite feature is used to obtain a uniform or (AuxBrt + Customer Brightness) if the source is on volume level, particularly while changing channels.

  • Page 18: Special Menu

    905-10525 USER MENUS (continued) CONTENT BLOCK LOCK ON/OFF Use the Left/Right arrow keys to select the Content This item turns the Parental Control feature On/Off. The Block Menu. Parental Control feature can only be turned on if the hours > 0, and a password has been set. Otherwise the DIALOG BLOCK Lock On/Off line will display either of the following error To block an entire program with the dialog rating, use...
  • Page 19 905-10525 USER MENUS (continued) SLEEP TIMER ON/OFF TIME The On/Off Time can be selected using the Up/Down keys. (Use volume down and volume up for 6-key EZ TIMER EZ TIMER keyboard). Pressing the TIMER key will increment the Sleep timer SLEEP TIMER to 0:10 and restore all other key functions.
  • Page 20 905-10525 USER MENUS (continued) PIP MENU TINT PIP All menu items are adjust with the Left/Right arrows This item allows the PIP tint. Tint adjustment has 63 keys, except the size menu. steps (0 to 63). SIZE PIP SPECIAL This option is used to select size of the PIP window. The customer may select the PIP window size as either Large or Small.
  • Page 21 905-10525 USER MENUS CHANNEL AND PIP DISPLAY EZ TIMER EZ TIMER EZ HELP EZ HELP The following display appears when the channel display and PIP is on. SLEEP TIMER IF YOU DO NOT HAVE ANY ON TIME 12 : 00 WATCHABLE CHANNELS OFF TIME...
  • Page 22 - 1-16 -...

  • Page 23: Factory Menu Adjustments

    Level 0 is used for private label sets. part number of the software in the TV set. To the lower levels 1 and 2 are used for Zenith sets. right is a number indicating that the module has been tested. The date on the black bar near the bottom left of 05 BAND: There are eight positions.
  • Page 24 905-10525 FACTORY MENU (continued) 17 RED CUT: B&W tracking adjustment. Range is 0 to 37 PIP V LEV: PIP auto gain control. Range is 0 - 15 . 254. Typical value is 0. Typical is 14. 18 GREEN CUT: B&W tracking adjustment. Range is 0- 38 YOFSET: PIP luminance offset.
  • Page 25 Used to store customer menu adjustment 1 PRE PX Moves captions and displays vertically 2 V POS Moves captions and displays 3 H POS Selects Zenith or private IR codes 4 LEVEL Broadcast band adjustment 5 BAND AC Power Only Off/On 6 AC ON...
  • Page 26 - 2-4 -...

  • Page 27: General Information

    When troubleshooting video circuits, remember that all video travels through the PIP IC (if used) and the Servicing the XC chassis is the same as with other Zenith Video/Audio switcher IC. A defect in either of these single-board chassis. If the set is dead, first check the IC’s can result in no video.

  • Page 28: Adjustments

    SERVICING (continued) ADJUSTMENTS IF AND AUDIO SERVICING G2 ADJUSTMENT VIDEO DETECTOR Use the following procedure when resetting G2. If there is no viewable picture on screen, access the Factory Menu and check default settings for the 1. Set brightness and contrast in Video Menu to mid following items: range.

  • Page 29: Purity & Convergence Setup Procedure

    SERVICING (continued) PURITY & CONVERGENCE SETUP PROCEDURE PRELIMINARY SETUP CONVERGENCE ADJUSTMENT 1.Allow the receiver to warm up for 15 to 20 minutes. 1.Release locking assembly. 2.Degauss the CRT. 2.Connect crosshatch generator to the receiver and adjust static (center) convergence as follows: 3.Connect a crosshatch generator to the receiver and “rough in”...

  • Page 30: Vertical-Tilt Wedge Adjustment

    SERVICING (continued) VERTICAL-TILT WEDGE ADJUSTMENT MODIFICATION 1.Place the magnet on the CRT funnel as shown in the The vertical lines at 6 and 12 o’clock are converged by vertically tilting the yoke and inserting a wedge at the figure displayed below, in the quadrant exhibiting top of the yoke until it is firmly seated between the impurity.

  • Page 31: Section 4

    All Xd models are module level repair only. Parts contact information is below. Voice: 1-888-3-ZENITH Fax: 1-888-6-ZENITH Mail: ZENITH NATIONAL PARTS P O Box 240007 Huntsville, AL 35824-6407 C27A25 C32A26 009-02165 Module ;Main with 1 Pip, 6 Jacks & Keyboard, 009-02168 Module, Main with 2 PIP,6 Jacks &...
  • Page 32 MODEL PARTS C36A26 C36A26T6 009-02170 Module, Main with 2 PIP,6 Jacks & Keyboard, 809-10558 Module, Main 36V with 2 PIP, 6 Jacks & MTS, Digital Comb Inv Keyboard, MTS, Digital Comb Inv 020-04330-34 Coil, Degausser 020-04330-34 Coil, Degausser 049-01368-07 Speaker, Oval 049-01368-07 Speaker, Oval, 6 X 13 Cm 124-00233-06...
  • Page 33 COMPONENT PARTS LIST REFERENCE CHART The following information is for models in and out of warranty. The 27” XC models are com- ponent level repair. To Order Parts: call 1-888-3-ZENITH fax 1-888-6-ZENITH By Mail: ZENITH NATIONAL PARTS SALES AND DISTRIBUTION CENTER...

  • Page 34: Component Parts List

    COMPONENT PARTS COMPONENT PARTS LIST A - C27A25 B- C27A25T6 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. RC REF PART# DESCRIPTION RC REF PART# DESCRIPTION AB 1CV 058-00586-05 Plug, Multiprong, Natural Color, 5 Position...
  • Page 35 COMPONENT PARTS LIST A - C27A25 B- C27A25T6 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. RC REF PART# DESCRIPTION RC REF PART# DESCRIPTION AB C2231M 022-08376-32A Cap, 100,000 pfd +80% & -20% 16V, Chip...
  • Page 36 COMPONENT PARTS LIST A - C27A25 B- C27A25T6 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. RC REF PART# DESCRIPTION RC REF PART# DESCRIPTION AB C6002M 022-08366-12A Cap, 2,200 pfd 10% 50V, Ceramic Chip...
  • Page 37 COMPONENT PARTS LIST A - C27A25 B- C27A25T6 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. RC REF PART# DESCRIPTION RC REF PART# DESCRIPTION AB D6001 103-00461A Diode, Fast Switching, High Conductance...
  • Page 38 COMPONENT PARTS LIST A - C27A25 B- C27A25T6 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. RC REF PART# DESCRIPTION RC REF PART# DESCRIPTION AB LX3201 149-00540-01 Core, Ferrite AB R1208M...
  • Page 39 COMPONENT PARTS LIST A - C27A25 B- C27A25T6 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. RC REF PART# DESCRIPTION RC REF PART# DESCRIPTION AB R2117 063-10235-92 Resistor, Film, 6.8K Ohm 5% 1/4W...
  • Page 40 COMPONENT PARTS LIST A - C27A25 B- C27A25T6 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. RC REF PART# DESCRIPTION RC REF PART# DESCRIPTION AB R2907M 063-11059-49A Resistor, Chip, 1K Ohm 5% 1/10W...
  • Page 41 COMPONENT PARTS LIST A - C27A25 B- C27A25T6 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. RC REF PART# DESCRIPTION RC REF PART# DESCRIPTION AB RX3003 063-10936-72 Resistor, Film, 4.32K Ohm 1% 1/4W...

  • Page 45: Section 6

    SECTION 5 27V Table Top Exploded View REF DESCRIPTION C27A25T C27A25T6 1 FRONT CABINET P014-12351-04 P014-12351-05 2 SPEAKER 049-1368-07 049-01368-07 3 KEYBORD P046-10594-01 P046-10594-02 4 IR LENS 922-10035 922-10035 5 CRT & YOKE ASSEMBLY A-19112 A-19112 6 REAR CABINET P014-12352-03 P014-12352-03 7 MAIN MODULE 009-2165 809-10051...
  • Page 46 32V Table Top Exploded View REF DESCRIPTION C32A26 C32A26T6 1 FRONT CABINET P014-123530-01 P014-12353-02 2 SPEAKER 049-01368-07 049-01368-07 3 KEYBORD P046-10594-01 P046-10594-02 4 IR LENS 992-10035 992-10035 5 CRT & YOKE ASSEMBLY A-19276 A-19276 6 REAR CABINET P014-12354-01 P014-12354-01 7 MAIN MODULE 009-02168 P009-02214 8 REMOTE CONTROL...
  • Page 47 36V Table Top Exploded View REF DESCRIPTION C36A26 C36A26-8 C36A26T6 C36A26T6-8 1 FRONT CABINET P014-12355-01 P014-12355-02 P014-12355-02 P014-12355-02 2 SPEAKER 049-01368-07 049-01368-07 049-01368-07 049-01368-07 3 KEYBORD P046-10594-01 P046-10594-02 P046-10594-02 P046-10594-02 4 IR LENS 992-10035 992-10035 992-10035 992-10035 5 CRT & YOKE ASSEMBLY A-18483 A-18639 A-18483 A-18639...

  • Page 48: Interconnect Diagram

    SECTION 6 Interconnect Diagram MENU CH-UP CH-DWN VOL-DWN VOL-UP ON/OFF SW 6 SW 3 SW 2 SW 5 SW 4 SW 1 FRONT JACK VIDEO RIGHT LEFT AC HIGH AC LOW IC6000 LX3401 TX3601 ICX3802 FIL V +215 V FX3601 IC2500 ICX3801 ICX2200...

  • Page 49: Power Supply

    Power Supply 58-546-02 58-5 46-02 KX3901 R3902 58-5 46-03 32/36V 195-161 THX3901 1/2W DX3901 103-461A THX3902 R3901 DEG-CTRL Q3 901 SHT.4 121-1340A THX3901 THX3902 4.7K DX3400 212-172-04 (PACKAGE) DE GA USSER 063-11119 ENERG Y STAR 32/36V 063-11119 063-11119 MO DELS O NLY DX3401, DX3402, DX3403, DX3404 103-588A (DISCRETE) FX3401 LX3401...

  • Page 50: Audio Processor

    Audio Processor R843 C843 100uF PWR-MUTE SHT.4 C1401M BASSL2 BASSL1 Q800 C841 0.015 C842M 121-1310A 1000uF C1403M C1402M TRE-R BASSR2 0.015 6800pF C863 IC800 R864M C1404M TRE-L 221-598-01 BASSR1 100uF 6800pF SURRIN SURRTC C861 C1405M C1406M R861M C865 0.022 0.01 SURROUT 10uF C862M...

  • Page 51: Main Processor

    Main Processor R+UP SHT.10 G+UP SHT.10 WF10 R6001 M 5.0V 4.88V B+UP 4.7K SHT.10 R6002 M 20uS R6050M FASTBLANK SHT.10 SHT.5 FLYBACK R6004M HALFTO NE Q60 01 SHT.5 C6042 M C6043 M C6044 M C6046M 121-1 310A SHT.10 R6003 M PROV PROV PROV...

  • Page 52: Video Processor

    Video Processor ICX2200 221-1165 C1229 COMP-AUD2 SHT.7 BLOCK DIAGRAM No. C-12 10uF C1227M SEE SHEET No. 27pF COMP-AUD SHT.3 L1203 L1205 TP1246 WF14 R 1 20 1 M 0.15V SHT.7 10UH 120uH C1216M C1217M C1226 A-12 N.C. N.C. L1202 R1222M 20 uS 1 0K 120PF...

  • Page 53: Horizontal/Vertical Deflection

    Horizontal/Vertical Deflection HO RZ-SIZE SHT.4 58 -643 -04 YOKE 27V ONLY TX3201 33 V WF18 +35 V GN D W3200 095-4372-01 25V/27V RX32 03 WF22 124V RX32 16 Vertical W3201 095-4438/-01 32V/36V 1.07KV 20 uS R33 03 CX32 04 +25 V 33 0 W3202 47 0...

  • Page 54: Jack And Switch Circuit

    Jack and Switch Circuit Y-MICRO SHT.4 RIGHT-SW SHT.3 CV-COMB SHT.9 R2926M Q2902 F-12 Q2900 121-1310A LEFT-SW SHT.3 121-1310A C-COMB SHT.9 D-12 R2904M R2928M R2927M Y-COMB Q2901 SHT.9 Y-OUT SHT.5 R2929M 121-1310A E-12 D-12 R2900M C2900M SCL1 R2901M SHT.4 PROV Q2903 R2905M A-12 R2902M...

  • Page 55: Video Ouput

    Video Ouput WF43 22.3V 20 US +215 +215 Red Drive R5100 R5111 Green Drive 220K Blue Drive 1/2W C5105 1/2W C5101 350V R5130M R5101 0.22uF 1.8K 100V L5100 4.7uH WF45 IC5100 140V TDA6103Q 20 uS WF44 R5112 4.46V 1/2W 20 uS L5101 R5123 4.7uH...

  • Page 56: Comb Filter Module

    Comb Filter Module CV-COMB SHT.7 G-12 R2430M R2435M 1.2K R2427M R2428M Y-COMB IC2400 SHT.7 3.3K G-12 C2422 221-1449 Q2404 Q2405 121-1310A 121-1310A L2407 C2434 10uF R2419M C2401M R2434M AVSS AVDD 15uH 10uF 12pF R2431M C2436M 1.2K PRO V C2421M R2420M R2429M C2435M 33pF...

  • Page 57: Pip Module

    PIP Module L2503 C2513M IC2500 10uH PRO V 221-1439 C2534M C2512M CV-PIP SHT.7 Xi n CVB S1 D-12 Q2501 27pF 121-1310A CR2500 27mHz SHT.4_G-1 FLYBACK R2503 SHT.5_B-12 C2511M SHT.6_B-1 4.7K VREFH 27pF C2500M R2504M 120pF C2517M C2530M CVBS2 .01uF Q2502 C2529M R2506M SW B...

  • Page 58: Pcb Layout

    PCB Layout ON/OFF VOL-UP VOL-DWN CH-UP CH-DWN MENU CO LD QX3504 HO T R3507 CRT1 LINE FILTER DIRECTION EAPROM W031 MICRO PR OCE SSOR CO LD HO T 204-03397-07 TGND PROCESS MA IN DIRECTION HO T TUNNE R CO LD VIDEO PR OCE SS OR PR OCE SS OR...

  • Page 59: Smd Layout

    SMD Layout IR6000 L5103 JP002 QX 3504 R6035M CX3401 J001M R2 910 RX3400 C6 081 R3 507 RX3705 ZD 2901 L6005 RX3704 R5129 RX3814 RX3701 FX3401 DX3603 W130 W138 L6 006 C6 015 R2 925 DX3602 RX3703 L3 805 CX3701 RX3702 RX3805 ICX 380 3...

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