Colour Television Chassis EM1A AA CL 06532111_000.eps 171000 Contents Page 1. Technical specifications, connection facilities & chassis overview 2. Safety- and maintenance instructions, warnings and notes. 3. Directions for use 4. Mechanical instructions 5. Faultfinding and repair tips 6.
GB 2 1. Technical specifications, connection facilities & chassis overview EM1A 1. Technical specifications, connection facilities & chassis overview 1.1 Technical specifications 1.1.1 Reception Tuning system Colour systems (off-air) : PLL : NTSC M (3.58 & 4.43 MHz), : PAL B/G/D/K/I/M/N, : SECAM B/G/D/K/L : FM/FM, : 2SC B/G, : NICAM B/G/D/K/I/L : PAL B/G, : SECAM, : NTSC M (3.58 & 4.43 MHz). : 100 channels, : UVSH-channels : 44.25 - 855.
Technical specifications, connection facilities & chassis overview 1.3 EM1A 1. GB 3 Chassis overview F CRT/SCAVEM PANEL D SIDE I/O PANEL B SMALL SIGNAL BOARD C PIP/DOUBLE WINDOW PANEL TOP CONTROL PANEL E MAINS SWITCH PANEL J LARGE SIGNAL PANEL A MAINS HARMONIC PANEL Y DAF PANEL I CL 06532130_003.
GB 4 2. EM1A Safety & maintenance instructions, warnings and notes 2. Safety & maintenance instructions, warnings and notes 2.1 Safety instructions for repairs Safety regulations require that during a repair: • Safety components, indicated by the symbol ∆, should be replaced by components identical to the original ones; • When replacing the CRT, safety goggles must be worn. Safety regulations require that after a repair, the set must be returned in its original condition.
Safety & maintenance instructions, warnings and notes 2.4 Notes • • • • • • The direct voltages and oscillograms should be measured with regard to the tuner earth (H), or hot earth (I) as this is called. The direct voltages and oscillograms shown in the diagrams are indicative and should be measured in the Service Default Mode (see chapter 5) with a colour bar signal and stereo sound (L: 3 kHz, R: 1 kHz unless stated otherwise) and picture carrier at 475.25 MHz.
4 M SMART AV g MOVIES VIDEO h X i ¬ 0 U C CH SURF a SMART Installation INSTALL LANGUAGE AUTO STORE MANUAL STORE SORT CHANNEL EDIT NAME INSTALL LANGUAGE AUTO STORE MANUAL STORE SORT CHANNEL EDIT NAME b V MENU select menu item Note: If no action is executed, the menu automatically disappears after about 12 seconds. PICTURE SOUND FEATURES INSTALL Press the i key to switch the menu off. Press the menu key to return.
MANUAL STORE COLOUR SYSTEM SOUND SYSTEM SEARCH CHANNEL STORE/STORED FINE TUNE PLL INSTALL LANGUAGE AUTO STORE MANUAL STORE SORT CHANNEL EDIT NAME è to 4 to continue searching for another transmitting Now repeat steps channel. Press the MENU key to return to the INSTALL menu or press the i key to switch menu off. 5 6 6 Installation INSTALL LANGUAGE AUTO STORE MANUAL STORE SORT CHANNEL EDIT NAME CNN 3 4 5 6 7 SKIPPED “ to è until all TV channel are allocated as you like.
j VCR 3 VIDEO OUT x R AUDIO L/Mono AV 1 in out in AV 2 COMPONENT VIDEO INPUT Pr Pb Y Monitor S-VIDEO ‘ ( “ & é VIDEO input. (See the instructions of your video recorder.) Connect Peripheral Equipment Replace the RF cable in the RF socket x of your video recorder after you have stored the test signal. Store the test signal under programme number 0 or between 90 and 99. Search for the test signal of your video recorder in the same way as you searched for and stored the TV signals.
1 VIDEO R AUDIO L/Mono in in out L DVD COMPONENT VIDEO INPUT Pr Pb Y AV 2 AV 1 Monitor AUDIO VIDEO S•VIDEO 2 2 S-VIDEO 1 3 S-VHS quality with an S-VHS camcorder is obtained by connecting the S-VHS cables with the S-VIDEO input 3 (instead of VIDEO 2) and AUDIO inputs 1. For stereo equipment also connect AUDIO R 1. Connect the equipment to VIDEO 2 and AUDIO L 1 for mono equipment. Connect your camera or camcorder to sockets at the right side of your TV.
Before Calling Service • No picture Turn off the television immediately and consult a qualified service personnel. Check whether the batteries are working. Replace if necessary. Clean the remote control sensor lens on the television. Operating range between television and the remote control should not be more than 6 meters. You can still use the keys at the top of your TV. This could be due to antenna siting or reflected signal. Switch over to “MONO” mode by pressing the X key.
Mechanical instructions EM1A 4. GB 11 4. Mechanical instructions 4.1 Removing the Rear Cover 1. Remove all the fixation screws of the rear cover. 2. Now the rear cover can be removed by pulling it backward. 4.2 Service positions 4.2.1 Service position LSP Position 1: For better accessibility of the LSP, do the following: 1 2 SSB LSP A LSP - bracket 3 1 4 Bottom tray 2 1 2 CL 06532130_004.eps 031000 Figure 4-1 1.
GB 12 4. Mechanical instructions EM1A 10. Reconnect cables (except degaussing cable 0020), panels and modules. To get access to the test points of the SSB, the shielding has to be removed: Alternative position 2: A somewhat easier way to access the bottom side (solder side) of the LSP is the following (only possible when the high tension cable is long enough): 2 3 2 5 1 1 1 FR PIP/D W M OM ODU LE (0 0948 205) 0946 1 4 4 CL 06532130_008.eps 131000 Figure 4-4 3 A CL 06532130_007.
Mechanical instructions 4.2.3 4. GB 13 1. The complete module can be removed from the LSPbracket by pressing its fixation clamp [1] (located behind the PWB), while sliding the module in the direction of the CRT [2]. 2. The board can easily be lifted from its bracket after releasing the 2 fixation clamps [3]. Accessing the Double Window (DW) panel PIP/Double Window EM1A 1 Multi Voltage 1 4.2.6 Accessing the Mains Harmonic panel 4 2 1 3 2 3 3 3 4 CL 06532130_015.eps 031000 CL 06532130_017.
GB 14 4.2.8 4. Mechanical instructions EM1A 1. The complete Side I/O-assembly can easily be removed by unscrewing the 2 fixation screws. 2. The board can easily be lifted out of the bracket after releasing the 2 fixation clamps. Accessing the Side I/O panel CL 06532012_004.eps 030200 Figure 4-10 4.2.9 Accessing the Mains Switch panel 1 1 2 3 3 CL 06532130_018.eps 021000 Figure 4-11 The easiest way to access this module is with the LSP in service position 2. 1.
Fault finding and repair tips EM1A 5. GB 15 5. Fault finding and repair tips • In this chapter the following paragraphs are included: 1. Test points. 2. Service Modes. 3. Problems and solving tips (related to CSM). 4. ComPair. 5. Error codes. 6. The 'blinking LED' procedure. 7. Protections. 8. Repair tips. 5.1 • Via grounding the 'Front Detect'-line on the Side I/O panel during switch ON (pins 1 and 7 of connector 0936).
GB 16 5. Fault finding and repair tips EM1A Entering • Via a standard RC-handset by entering the code '062596' followed by the 'OSD' button [i+]. • Via ComPair. • By the 'ALIGN' button on the DST while the set is in the normal operation mode. The following screen will be shown, with 'SAM' at the upper right side for recognition.
Fault finding and repair tips Line 3: Software and hardware functionality of the EM1A is controlled by option bits. An option byte or option number represents 8 of those bits. Each option number is displayed as a decimal number between 0 and 255. The set may not work correctly when an incorrect option code is set. See chapter 8 for more information on correct option settings The menus and submenus • CLEAR ERRORS. Erasing the contents of the error buffer.
GB 18 5. EM1A Fault finding and repair tips Colours not correct / unstable picture Check CSM line 4. Wrong colour system installed. To change the setting: 1. Press the 'MENU' button on the remote control. 2. Select the INSTALL sub menu. 3. Select the MANUAL STORE sub menu. 4. Select and change the COLOUR SYSTEM setting until picture and sound are correct. 5. Select the STORE menu item.
Fault finding and repair tips EM1A 5. GB 19 A question could be: Does the screen give a picture? (Click on the correct answer) YES / NO An example can be: Measure test-point I7 and click on the correct oscillogram you see on the oscilloscope I7 B7502 L EXTERNAL 2 R AUDIO EXTERNAL 1 SERVICE CONNECTOR 1V / div DC 10µs / div PC VCR Power 9V DC I2C CL96532160_029.
GB 20 5. EM1A Fault finding and repair tips ERROR: 9 6 0 0 0 0 0 : Error code 6 was first detected and error code 9 is the last detected (newest) error error code (and not the actual cause). E.g. a fault in the protection detection circuitry can also lead to a protection. The contents of the error buffer can also be made visible through the 'blinking LED' procedure. This is especially useful when there is no picture. See paragraph 5.6 'The blinking LED procedure '. 5.5.
Fault finding and repair tips 5.6 Example: Error code position 1 2 3 4 5 Error buffer: 12 9 6 0 0 After entering SDM: 1 long blink (750 ms.) - pause (1500 ms.) - 2 short blinks - pause (3 s.) - 9 short blinks - pause (3 s.) 6 short blinks - pause (3 s.) - long blink (3 s.) - etc. Error 11 During the last start-up, the NVM and the micro controller did not recognise each other (e.g.
GB 22 5. HFB X-RAY PROTECT Fault finding and repair tips EM1A positioned in ‘Standby’-mode. The Painter will now try to restart the set. If this will not succeed after 5 times (after ≈ 30 60 s.), the Painter will generate error 7 (this error can have several causes, such as a Flash, BRIDGE_PROT, DEFL_PROT or a serious mains dip). A blinking red LED will be started. X-RAY PROTECT EHT-INFO BCL XPR (43) HOP FLS (5) FLASH DETECT HFB NHF (13) 5.8 Repair tips 5.8.
Fault finding and repair tips EM1A 5. GB 23 off Standby supply starts oscillating Standby-supply is running; +3.3V, +5V2 ready 'Standby-info' = high; µP has been reset by POR Low_power_standby High_power_standby Degaussing is activated automatically and should be acivated after 12 seconds Standby bit set in NVM? yes no Initialize I/O pins of the OTC Make 'Standby-info' low 'Standby-info' remains high Supply is in standby-mode Mute 5V2 present on the HOP.
GB 24 • • • • 5.8.2 5. EM1A Fault finding and repair tips Notice that a very big part of the set (Large Signal Panel) is 'hot', meaning the primary part of the Standby supply, the whole Main supply (except for the secondary Audio supply) and the complete deflection circuit. So notice that the deflection-coil is hot! This set does not have an IR transmitting-LED. In its place, a Service (ComPair) connector is implemented at the rear of the set, which is directly accessible.
Fault finding and repair tips EM1A 5. GB 25 Phenomenon Possible Cause Repair tip No picture, no LED. Standby Supply defective. No picture, red LED (high intensity). Despite expectation, the set should be ON (this looks like Standby). After some time LED will start blinking. Set going into protection after 5 restarts (error 7), taking about 30 - 60 s.
GB 26 5.
Alignments EM1A 8. GB 77 8. Alignments Note: The Service Default Mode (SDM) and Service Alignment Mode (SAM) are described in chapter 5. 8.1 General alignment conditions max. All electrical adjustments should be performed under the following conditions: • Supply voltage: 110 / 220 V (± 10 %); 50 / 60 Hz (± 5 %) • Warm-up time: ≈ 20 minutes • The voltages and oscillograms are measured in relation to the tuner earth (with exception to the voltages on the primary side of the power supply).
GB 78 8. EM1A Alignments Initial set-up 1. Connect an external video pattern generator (PAL BG, 475.25 MHz) to the aerial input of the TV-set with a crosshatch test pattern. 2. Set 'Smart Picture' to NATURAL. 3. Activate the SAM-menu (see chapter 5). 4. Go to sub-menu GEOMETRY. Now the following alignments can be performed: 4. If the frequency showed in the line 'Fine tune' is between 471.18 MHz and 471.31 MHz, you don't need to re-adjust the IF-AFC. 5.
Alignments • -63 to -1 represent a negative offset (-63 is the minimum negative offset). 1. Set pattern generator (e.g. PM5418) to a white spot (chess board) pattern and connect RF output with aerial input. Set amplitude to 1 mV and set frequency for PALBG to 475.25 MHz. 2. Set CONTRAST to the maximum value (99). 3. NORMAL settings – NORMAL RED = 32 – NORMAL GREEN = 32 – NORMAL BLUE =32 4. COOL settings – DELTA COOL RED = -3 – DELTA COOL GREEN = 0 – DELTA COOL BLUE = 3 5.
GB 80 8. EM1A Alignments Option table (version 1A1): Table 8-2 Byte Bit Abbr. Feature Description (OFF = 0, ON = 1) OB1 1 AUSB Auto Standby After 2hrs OFF = function disabled / ON= function enabled OB1 2 AV3 Side AV source OFF = side AV source not available / ON = available OB1 3 HOSP Hospitality mode OFF = hospital mode disabled / ON = enabled OB1 4 E149 Picture setting for expand 14:9 OFF = not available in FORMAT menu / ON = available OB1 5 C169 Pict.
Alignments EM1A 8. GB 81 Option table (version 2A1 / 2A2): Table 8-3 Byte Bit Abbr. Feature OB1 1 AV3 Side AV source Description (OFF = 0, ON = 1) OFF = side AV source not available / ON = available OB1 2 SMCK Smart clock OFF = function disabled / ON= function enabled OB1 3 HOSP Hospitality mode OFF = hospital mode disabled / ON = enabled OB1 4 E149 Picture setting for expand 14:9 OFF = not available in FORMAT menu / ON = available OB1 5 C169 Pict.
GB 82 9. Circuit descriptions and abbreviation list EM1A 9. Circuit descriptions and abbreviation list 9.1 Circuit descriptions The architecture consists of a conventional Large Signal Panel (LSP) a Double Window panel (DW) and a Small Signal Board (SSB) module, placed into a so-called SIMMconnector (Standard Interface, 80 pins). The following circuits are described: 1. Introduction 2. Block diagrams 3. Power supply 4. Control & Teletext 5. Tuner & IF 6. Video: High-end Input Processor 7.
Circuit descriptions and abbreviation list The tuner type is a PLL tuner and delivers the IF-signal, via audio & video SAW-filters, to the HIP (High-end Input Processor). The HIP has the following functions: • IF modulation. • Video source- and record select. • Colour decoder. • Synchronisation. • • • • EM1A 9.
GB 84 • 9. Circuit descriptions and abbreviation list EM1A voltage polarity at the secondary winding is negative (due to different winding direction), meaning that diode D will block. Capacitor C will discharge via RL, UOUT will decrease. Opening switch 'S' will generate a counter-e.m.f. in the primary winding, trying to maintain current ID. Through this the polarity of the secondary voltage will inverse. The magnetic energy, stored in the coil, will now be transformed to the secondary side.
Circuit descriptions and abbreviation list Since there are no capacitors and there is a high amplification-factor in the feedback circuit, the feedback is ultra-fast. This is why the ripple on UOUT is minimal. The negative supply voltage (-20 V) used in the feedback circuit originates from the co-coupling coil and is rectified through D6103. Stabilisation is not effected through duty-cycle control but through burst-mode of TS7100. Burst-mode is load dependent.
GB 86 9. EM1A Circuit descriptions and abbreviation list To stabilise the output voltage, a feedback loop is implemented, which will reduce TON when VBAT increases and vice versa. Guarding circuit: The negative pulses on the secondary winding of L5506 are rectified by D6520 and smoothed by C2535. The resulting negative DC-voltage will keep TS7510 blocked, even as TS7511. Via a voltage divider, excisting of (1 %) resistors R3507, R3510 and R3527, a voltage of 2.
Circuit descriptions and abbreviation list NVM The Non Volatile Memory contains all set related data that must be kept permanently, such as: • Software identification. • Operational hours. • Error-codes. • Option codes. • All factory alignments. • Last Status items for the customer + a complete factory recall. • TXT featuring (keeping habit watch data). 9.1.5 • The output of the tuner is controlled via an IF-amplifier with AGC-control.
GB 88 9. Circuit descriptions and abbreviation list EM1A 100 Hz conversion The main task of the PICNIC is the conversion from 50 Hz to 100 Hz for YUV and HV-sync. In order to remove 'large area flicker' (especially visible in a white picture), the field-rate of the video is doubled by the FBX6. A 50 Hz frame frequency is converted to 100 Hz. Also the line frequency (16 kHz) is doubled (32 kHz). Basically, when the video input contains fields A, B etc...
Circuit descriptions and abbreviation list During the 1st frame, 3 pulses are generated to adjust the cut-off voltage at a current of 8 µA. With this measurement the black level at the RGB-outputs is adjusted. So at start-up there is no monitor pulse anymore. At start-up, the HOP measures the pulses, which come back via pin 44. The RGB-outputs have to be between 1.5 V and 3.5 V. If one of the outputs is higher than 3.5 V or one of them lower then 1.5 V, the RGB-outputs will be blanked. EM1A 9.
GB 90 9. Circuit descriptions and abbreviation list EM1A 5430 5430 I Defl I Defl 141V 141V t1 t2 t2 6423 2425 7421 2421 Line defl. + 2433 - 100V 6423 t3 Line defl. 2425 7421 141V 2433 2421 2420 2420 41V 6422 2426 5422 6422 41V 2426 5422 CL 96532156_024.eps 060199 Figure 9-9 Period t1 - t2: When TS7421 is driven into conductivity, the capacitor voltage of 141 V, will be divided across bridgecoil L5422 and the deflection coil (conn. 0317).
Circuit descriptions and abbreviation list flowing in L5422 (1-2). The voltage across the deflection coil increases, so the picture width increases. When TS7480 blocks, C2421 will not discharge anymore and the voltage across C2421 will remain constant. The result is that the voltage across the deflection coil is minimal. The voltage across coil L5422, however, is maximal.
GB 92 9. EM1A Circuit descriptions and abbreviation list Via the circuit built around TS7641 the frame output stage is guarded. If the frame output stage is working properly, TS7641 and TS7652 will both conduct and thereby discharging C2642. TS7407 is blocked now, causing the STANDBY signal to be high ohmic. If there are frame pulses missing, TS7641 will block and capacitor C2642 can be charged. Transistor TS7407 will now start conducting and the STANDBY signal will be grounded via R3403.
Circuit descriptions and abbreviation list The supply voltage is +28 V, generated by the main supply via L5506. Muting is done via the SOUND-ENABLE line connected to pin 2 of the amplifier-IC and coming from the Painter. This signal is inverted by TS7730, as a result of which at a high level of the SOUND-ENABLE signal, current is sinked from pin 2 and the IC mutes. 9.1.13 CRT & SCAVEM (diagram F) RGB amplifiers On the CRT panel, the RGB amplifier (TDA6108, IC7307) is located.
GB 94 9.
Circuit descriptions and abbreviation list EM1A 9. GB 95 Power supplies The power supplies used by DW panel are from the main board 5V, 8V and 33V (for tuner only). The 5V is regulated to +3.3V, +3V & +3VD by IC7802 LM317T. These voltages are mainly used by DW processor circuitry. The 8V is mainly supplied to IC7301 TDA888x IF + video processing circuitry and also to fast switching IC7803. CL06532045_072.eps 100500 Figure 9-14 SAW-filter (pos. 1352) RESET = Low RESET = High AP P/M (38.
GB 96 9.2 9.
Circuit descriptions and abbreviation list IN-SC1-G IN-SC1-R IN-SC1-SNDL IN-SC1-SNDR IN-SC2-B IN-SC2-CVBS_Y IN-SC2-FBL IN-SC2-G Interlaced IO-BUS Last Status LDP LED LINE-DRIVE LNA LSP MSP MUTE NC NDF NHF NVM O/C ON/OFF LED OSD Painter P50 PCB PICNIC PILOT PILOTMUTE Progressive Scan PTP RAM RC RC5 RESET ROM SAM SC SCAVEM S/C SC1-OUT SC2-B-IN SC2-C-IN SC2-OUT SIF SIMM SLDP SNDL-SC1-IN In EXT1 Green In EXT1 Red In EXT1 sound left In EXT1 sound right In EXT2 Blue In EXT2 CVBS or luminance (SVHS) In EXT2
GB 98 10. Spare parts list EM1A 10.
Spare parts list 3316 3318 3319 3321 3322 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3345 3347 3348 3349 3350 3351 3352 3354 3355 3356 3357 3358 3365 3402 3403 3404 3406 3407 3408 3409 3410 3411 3414 3415 3417 3418 3431 3450 3451 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3476 3477 3478 3481 3484 3485 3486 3487 3489 3490 3495 3496 3497 3498 3499 3500 3501 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 4822 117 11148 4822 051
GB 100 6111 6120 6121 6122 6200 6204 6205 6206 6207 6305 6306 6307 6308 6309 6310 6405 6406 6407 6408 6421 6422 6442 6461 6463 6465 6466 6468 6480 6481 6482 6492 6493 6499 6504 6505 6506 6507 6508 6510 6511 6512 6514 6515 6516 6517 6518 6519 6600 6616 6619 6620 6623 6660 6665 6731 6732 10.
Spare parts list 2640 2651 2652 2653 2654 2655 2656 2657 2658 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2673 2674 2675 2677 2678 2679 2680 2681 2682 2685 2686 2693 2694 2702 2703 2704 2706 2707 2708 2709 2710 2712 2713 2728 2729 2730 2731 2733 2738 2743 2747 2748 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2770 2771 2772 2773 2774 2776 2785 2786 2788 2790 2792 2795 2796 2798 2900 2901 2902 2903 2904 2906 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 4822 126 13879 4822 126
GB 102 3706 3707 3708 3709 3711 3714 3716 3717 3718 3719 3720 3725 3728 3731 3732 3733 3739 3740 3741 3744 3745 3746 3747 3748 3749 3754 3755 3757 3759 3790 3791 3792 3793 3794 3795 3796 3797 10.
Spare parts list 2832 2833 2834 2836 2837 2838 2839 2841 2842 2843 2844 2846 2847 2848 2849 2851 2852 2853 2854 2856 2857 2861 2862 2863 2864 2866 2867 2868 2869 2871 2872 2873 2874 2876 2877 2878 2882 2883 2891 2892 2893 2894 2895 2896 2897 2898 2899 4822 126 14043 4822 126 14305 4822 124 40248 4822 126 14305 4822 126 13838 4822 124 40248 4822 126 13838 4822 124 40248 4822 122 33753 4822 126 14305 4822 126 14305 4822 126 13838 5322 122 33538 4822 126 13838 4822 126 13838 4822 124 40248 4822 126 14585 4822
GB 104 10. f 3901 3902 3903 3904 3905 3906 3908 3910 3911 3912 8936 [J] Mains Switch Panel 4822 051 20101 4822 116 52201 4822 051 20101 4822 116 52201 4822 116 52249 4822 050 11002 4822 050 11002 4822 116 52276 4822 050 21003 4822 050 21003 3104 301 07753 100Ω 5% 0.1W 75Ω 5% 0.5W 100Ω 5% 0.1W 75Ω 5% 0.5W 1k8 5% 0.5W 1k 1% 0.4W 1k 1% 0.4W 3k9 5% 0.5W 10k 1% 0.6W 10k 1% 0.
