Sharp 29LF-92E User manual

1
29LF-92E
SERVICE MANUAL
This document has been published to
be used for after sales service only.
AK-45 CHASSIS
In the interests of user safety (required by safety
regulations in some countries) the set should be re-
stored to its original condition and only parts identi-
cal to those specified should be used.
CONTENTS
ELECTRICAL SPECIFICATIONS ........................................................................................ 3
IMPORTANT SERVICING NOTES ...................................................................................... 4
CONTROLS & TERMINALS ................................................................................................ 5
PRINTED WIRING BOARD LAYOUT ................................................................................. 7
PARTS LISTING ................................................................................................................... 8
HOW TO UPDATE THE TECHNICAL INFORMATION ...................................................... 15
SHARP CORPORATION
PAL B/G / SECAM L/L’, B/G, D/K SYSTEM COLOUR TELEVISION
MODEL 29LF-92EC/IT
SE0029LF92E00
Issued: 28th July 2004
In order to service the model 29LF-92E, refer to
the AK-45 Chassis Service Manual
(SE00AK45CHA00).

2
29LF-92E
Use this page to keep any special servicing information as Technical Report (Bulletin), Technical Information, etc.
If only part number changes are required, just change part number directly the part number in the Parts Listing Section.
If you need more information, please refer to the Technical Report (Bulletin).
SERVICE MANUAL UPDATE LOG SHEET
Part No.
Technical Report No.
Technical Bulletin No. Cause / Solution Page No. Application
Data /Serial No.

3
29LF-92E
ELECTRICAL SPECIFICATIONS
WARNING
The chassis in this receiver is partially hot. Use an isolation transformer between the line cord plug
and power receptacle, when servicing this chassis.
To prevent electric shock, do not remove cover. No user-serviceable parts inside. Refer servicing to
qualified service personnel.
Specifications are subject to change without prior notice.
MODEL DESTINATION (Operation Manual Languages)
28LF-92EC: Czech, English, Hungarian, Polish, Romanian, Russian, Slovakian
28LF-92EIT: Italiano.
•Picture Intermediate frequency
L’ ................................................ 33.9MHz
L, B/G, D/K .............................. 38.9MHz
•Sound Carrier Trap
L’ ................................................ 40.4MHz
L, D/K ......................................... 32.4MHz
B/G ............................................ 33.4MHz
•Adjacent Sound Carrier Trap
L’ ................................................ 32.4MHz
L, D/K, B/G ................................ 40.4MHz
•Adjacent Picture Carrier Trap
L’ ................................................ 41.9MHz
L, D/K ...................................... 30.9MHz
B/G ............................................ 31.9MHz
•Aerial Input Impedance
VHF/UHF ................. 75 ohm Unbalanced
•Tuning Ranges ..... 45.75MHz thru 855.25 MHz
VHF: S1 - S41 CH (Hiperband)
E2 - E12 CH / F2 - F10
UHF: E21 - E69 CH
AREA 29”
A0.4
BC 1.0
DE 1.0
FGHJ 1.5
KLMN 1.3
F’G’H’J’ 1.3
STUV 1.0
mm
•Power Input .................... 220V-240 Volts AC 50 Hz
•Power Consumption
Normal Operation (Method IEC60107) ............... 83 W
Stand-by Operation .......................................... < 4 W
•Audio Power Output Rating (MPO) / Impedance
Internal Left Speaker ................................. 10 W, 7 Ω
Internal Right Speaker ............................... 10 W, 7 Ω
•Speakers
Full range (2 pcs) ................................... 60 x 120 mm
•Convergence (Maximum Misconvergence)
•White Level
Apply the rated voltage at the rated frequency to the TV set, while it is receiving full white pattern RF signal of 60
dB/µV from its RF input via the pattern generator.
Turn all picture controls to maximum value. Measure the colour temperatures at the center of the screen by
using the colour analyzer.
29LF94EC: X=0.304 ± 0.015 Y=0.306 ± 0.015
29LF94EIT: X=0.290 ± 0.015 Y=0.300 ± 0.015

4
29LF-92E
IMPORTANT SERVICING NOTES
Only qualified service personnel are allowed to carry out maintenance and repair of this receiver.
Servicing of High Voltage System and CRT
It is important that the static charge is removed from the high voltage system when carrying out work on the
receiver. This can be achieved by connecting a 10K resistor (with a suitably insulated lead) from the CRT
cavity connector to the CRT ground tag. This must be carried out with the AC supply disconnected from the
receiver.
Note the following:
•The CRT in this receiver employs Integral Implosion Protection.
•If the CRT has to be changed it MUST be replaced with the correct type for continued safe working.
•DO NOT lift the CRT by its neck.
•When handing the CRT, ensure that shatterproof goggles are worn.
•Ensure that the CRT is discharge before handling.
X-Ray
This receiver is designed to keep any x-ray emission to an absolute minimum. Some fault conditions and
servicing procedures may produce potentially hazardous x-ray radiation levels. This is a problem when in
close proximity to the receiver for long periods of time. To reduce any risks associated with this, please
observe the following precautions:
1. When undertaking any servicing on this chassis, DO NOT increase the EHT to more than 33 KV, (at a
instantaneous beam current of 1800 µA).
2. Ensure that during normal operation the EHT does not exceed 29.55 KV (at a beam current of 1800 µA).
This level has been preset in the factory. Always check that this level has not been exceeded after
carrying out any repair on the receiver.
3. DO NOT replace the CRT with any other type than that specified in the parts listing as this may cause
excessive x-ray radiation.
Before returning the receiver to the customer
In addition to the above checks, the following should also be carried out before returning the receiver to the
customer.
1. Inspect all the leads to ensure that they are dressed correctly and that they are not obstructed or pinched
by any other parts.
2. Ensure that all protective devices are in good condition. These will include nonmetallic control knobs,
insulating fish papers, cabinets backs, compartment covers or shields, mechanical insulators, etc.

5
29LF-92E
CONTROLS & TERMINALS
FRONT PANEL
Speakers (left + right)
= Power O / Off
= Volume -/+
CH = Program -/+
= Headpho e 3,6 mm Ø
69,'(2 9,'(2 / 6 * ,   5 ' ''
   $8', 2
69,'(2 9, '(2
/6*,5'''
$8',2
S-VIDEO
VIDEO
AUDIO (L/S/G/I) = Audio left
AUDIO (R/D/D/D) = Audio right
Speaker Covers
Remote Co trol I dicator
Sou d I dicator
Power I dicator
REAR TV
RF Input
1. Aerial terminal
21-pin In/Out
2. 21-pin Audio/Video (RGB) (EXT.1) With
AL/SECAM/NTSC Video Input
3. 21-pin Audio/Video (EXT.2) With
AL/SECAM/NTSC Video Input
(;7
(;7


6
29LF-92E
REMOTE CONTROL

= Sta d By
= Cursor Up
= Cursor Right
OK = OK
= I fo (Program Me u)
0 - 9 = Direct Program
-/-- = Double Digit
= Wide mode butto
P/CH+ = Program +
+ = Volume +
= TV / Quit Me u
(;7
= EXT butto
(EXT-1, RGB, EXT-2, F-AV, S-VHS)
Y llow = Feature Me u
Blu = I stallatio Me u
= Hold

= Update
= I dex Page
= Reveal
= Expa d
= Mix

= Teletext
= Time

R d = Sou d Me u
Gr n = Picture Me u
= Mute
I-II = Mo o/Stereo - Dual I-II
- = - Volume
- P/CH = -Program
= Flash back butto

M = Me u

= Cursor Dow

= Cursor Left

7
29LF-92E
CHASSIS LAYOUT
Mother Unit
CRT Unit Front AV Unit Keyboard Unit

TABLE OF CONTENTS
1.INTRODUCTION ........................................................................................................................ 1
2.TUNER.......................................................................................................................................... 1
3.IF PART (TDA9885/86)............................................................................................................. 1
4.VIDEO SWITCH TEA6415....................................................................................................... 2
5.MULTI STANDARD SOUND PROCESSOR....................................................................... 2
6.SOUND OUTPUT STAGE WITH TDA7269A...................................................................... 2
7.BERTICAL OUTPUT STAGE WITH STV9379FA.............................................................. 2
8.VIDEO OUTPUT AMPLIFIER TDA6108 .............................................................................. 2
9.POWER SUPPLY (SMPS)....................................................................................................... 3
10.MICROCONTROLLER SDA55XX....................................................................................... 3
10.1.General Features.................................................................................................................... 3
10.2.External Crystal and Programmable Clock Speed................................................................ 3
10.3.Microcontroller Features........................................................................................................ 3
10.4.Memory................................................................................................................................... 3
10.5.Display Features..................................................................................................................... 3
10.6.Acquisition Features.............................................................................................................. 4
10.7.Ports........................................................................................................................................ 4
11.CLASS AB STEREO HEADPHONE DRIVER TDA1308............................................... 4
12.SAW FILTERS.......................................................................................................................... 4
13.IC DESCRIPTIONS ................................................................................................................. 5
13.1.LM317T................................................................................................................................ 5
13.1.1.Description....................................................................................................................... 5
13.1.2.Features............................................................................................................................ 5
13.2.TDA1308T........................................................................................................................... 5
13.2.1.General Description......................................................................................................... 5
13.2.2.Features............................................................................................................................ 5
13.2.3.Pinning ............................................................................................................................. 6
13.3.MSP34X0G (MSP3410G)................................................................................................ 6
13.3.1.Description....................................................................................................................... 6
13.3.2.Features............................................................................................................................ 7
13.3.3.Pin connections ............................................................................................................... 7
13.4.VDP313xY .......................................................................................................................... 8
13.4.1.Introduction...................................................................................................................... 8
13.4.2.Features............................................................................................................................ 9
13.4.3.Pin Connections and short descriptions ........................................................................ 9
13.5.TEA6415C .........................................................................................................................10
13.5.1.General Description........................................................................................................10
13.5.2.Features...........................................................................................................................10
13.5.3.Pinning
................................
................................
................................
............................
11

13.10.SDA5555..........................................................................................................................13
13.10.1.General definition..........................................................................................................13
13.10.2.Features.........................................................................................................................13
13.11.MC44608..........................................................................................................................14
13.11.1.Description....................................................................................................................14
13.11.2.General Features...........................................................................................................15
13.11.3.Pin Connections............................................................................................................15
13.12.TCET1102G....................................................................................................................16
13.12.1.Description....................................................................................................................16
13.12.2.Applications ..................................................................................................................16
13.12.3.Features.........................................................................................................................16
13.13.TDA9885T.......................................................................................................................16
13.13.1.General Description......................................................................................................16
13.13.2.Features.........................................................................................................................16
13.13.3.Pinning...........................................................................................................................17
13.14.PI5V330............................................................................................................................17
13.14.1.General Description......................................................................................................17
14.AK45 CHASSIS PRODUCTION SERVICE MODE ADJUSTMENTS........................18
14.1.SERVICE MENU.....................................................................................................................18
14.2.ADJUST MENU ......................................................................................................................18
14.3.OPTIONS MENU.....................................................................................................................30
Option 0. Video Processor Crystal Indication..........................................................................30
Option 1. (0x01) Video Processor Decoder Mode Register......................................................30
Option 2. (0x18) Video Processor Blanking Control ................................................................30
Option 3. (0x19) Video Processor Cathode Drive Level...........................................................31
Option 4......................................................................................................................................31
Option 5. CTI Avaliable, Mono AVL...........................................................................................31
Option 6......................................................................................................................................31
Option 7. OPTIONHOTELACTIVE, PLL_VST, PIP Zoom Mode, PIP Position...........................31
Option 8. IF Frequency..............................................................................................................32
Option 9. Standard Available.....................................................................................................32
Option 10. Scart, Combfilter, Teletext, Language.....................................................................33
Option 11. PLL Tuner Control 1 Byte........................................................................................33
Option 12. PLL Tuner Control 2 Low Byte................................................................................33
Option 13. PLL Tuner Control 2 Mid Byte.................................................................................34
Option 14. PLL Tuner Control 2 High Byte ...............................................................................34
Option 15. PLL Tuner VHF LOW –VHF HIGH Crossover Low Byte.........................................34
Option 16. PLL Tuner VHF LOW –VHF HIGH Crossover High Byte........................................34
Option 17. PLL Tuner VHF HIGH –UHF Crossover Low Byte..................................................34
Option 18. PLL Tuner VHF HIGH –UHF Crossover High Byte.................................................34
Option 19. PIP PLL Tuner Control 1 Byte .................................................................................35
Option 20. PIP PLL Tuner Control 2 Low Byte..........................................................................35
Option 21. PIP PLL Tuner Control 2 Mid Byte ..........................................................................35
Option 22. PIP PLL Tuner Control 2 High Byte.........................................................................35
Option 23. PIP PLL Tuner VHF LOW
–
VHF HIGH Crossover Low Byte
................................
..
35

Option 39. Personal Preferance Equalizer Band 1 ...................................................................39
Option 40. Personal Preferance Equalizer Band 2 ...................................................................39
Option 41. Personal Preferance Equalizer Band 3 ...................................................................39
Option 42. Personal Preferance Equalizer Band 4 ...................................................................39
Option 43. Personal Preferance Equalizer Band 5 ...................................................................39
Option 44. Sound Efect (Standard; Music; Speech; Jazz; Pp).................................................39
Option 45. Volume Offset Left...................................................................................................39
Option 46. Volume Offset Right ................................................................................................39
Option 47. Volume Offset Center ..............................................................................................40
Option 48. Volume Offset Rear..................................................................................................40
Option 49. Surround Delay........................................................................................................40
Option 50. FM Prescale..............................................................................................................40
Option 51. NICAM Prescale.......................................................................................................40
Option 52. Scart Input Prescale ................................................................................................40
Option 53. I2S Prescale .............................................................................................................40
Option 54. Scart Output Prescale..............................................................................................40
Option 55. Speaker Setup..........................................................................................................41
Option 56. Audio Options Available Or Not..............................................................................41
Option 57. Stereo Threshold.....................................................................................................41
Option 58. MSP Audio Flags......................................................................................................42
Option 59. NICAM Threshold.....................................................................................................42
Option 60. Power Delay Time....................................................................................................42
14.4.OPTION TABLE RECOMMENDED VALUES..........................................................................45
14.5.SCREEN ADJUSTMENT (FBT SCREEN)...............................................................................47
14.6.GEOMETRY ADJUSTMENT...................................................................................................48
4:3 FORMATS.............................................................................................................................48
16:9 FORMATS...........................................................................................................................49
16.BLOCK DIAGRAM.................................................................................................................57