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SERVICE MANUAL
Service Manual
Additionally required Service Manuals for the Complete Service:
Service Manual
Sicherheit Safety
D
Btx 32700 #
*
Sach-Nr./Part No.
Sach-Nr./Part No.
72010-019.10
72010-800.00
Chassis G 1000 Stereo (ST 03)
GT 2005 GT 2105
(77250-056.61/GCC 1261GB) (77250-055.61/GCC 1361GB)
TRC 1 TRC 2 .
(75990-200.14) (75990-300.00)
Attention: The picture tube panel must be removed before disconnecting the yoke plug
Änderungen vorbehalten Subject to alteration
Printed in Germany VK 221 0596
Service Manual Sach-Nr. Service Manual Part No. 72010-019.10
General Section
ST 03
The regulations and safety instructions shall be valid as provided by the "Safety" Service Manual, part number 72010-800.00, as well as the respective national deviations.
Safety Advice
The X-radiation developing in the sets conforms to the X-radiation Regulations (January 8, 1987), issued by the Physikalisch-Technische Bundesanstalt (federal physiotechnical institution). The high tension for the picture tube and thus the developing Xradiation depends on the precise adjustment of the +A power supply. After every repair of the power supply unit or the horizontal deflection stage it is imperative that the EHT for the picture tube is checked and re-adjusted if necessary. To avoid consequential damages to the chassis or the picture tube the integrated protective circuits are allowed to be put out of operation only for a short time. When replacing the picture tube use only the types specified in the spare parts lists.
General Part
Test Equipment / Aids
Variable isolating transformer Colour Generator DC Voltmeter AF Generator Test/Sweep Generator Oscilloscope AF Voltmeter Frequency counter
Please note the Grundig Catalog "Test and Measuring Equipment" obtainable from: Grundig electronics GmbH Würzburger Str. 150 D-90766 Fürth/Bay. Tel.0911/703-0 Telefax 0911/703-4479
Table of Contents
Page
General Section ..................................... 1-1... 1-8
Safety Advice ............................................................................... 1-2 Technical Data .............................................................................. 1-2 Remote Control TRC 1 ................................................................. 1-3 Remote Control TRC 2 ................................................................. 1-3 Brief Service Instuctions ............................................................... 1-4 Fasttext Operation ........................................................................ 1-4 Operating Hints ............................................................................. 1-5
Technical Data
TV Receivers .............................................. 20" / 21" Mains voltage .............................................. 220...240V ~ 50/60Hz Control range of the power supply .............. 190...264V Screen diagonal .......................................... 51cm / 55cm Picture diagonal .......................................... 48cm / 52cm Power consumption ..................................... ca. 55W Power consumption in Standby ................... ca. 8W Aerial socket ............................................... 75 coaxial plug Programmes ............................................... 99 + 2AV Standard ..................................................... PAL/I Output power .............................................. 2x5W RMS Temperature range ...................................... 0 - 40° C
Circuit Descriptions .............................. 2-1... 2-3
1. Power Supply ......................................................................... 2-1 2. Tuner and Demodulator Circuits ............................................ 2-1 3. Peritel Output ......................................................................... 2-1 4. Video Chroma Processing ..................................................... 2-1 5. Delay Line .............................................................................. 2-1 6. Time Base Generator ............................................................. 2-2 7. RGB Drivers ........................................................................... 2-2 8. System Microcontroller (IC500) .............................................. 2-2 9. Output Power Stages ............................................................. 2-3 10. Video Output Stages .............................................................. 2-3 11. Teletext Options ...................................................................... 2-3 12. Power Supply to MSP 3400/3410 .......................................... 2-3 13. Second Peritel and Mute Circuit ............................................. 2-3 14. Audio Amplifier ........................................................................ 2-3
Alignment ....................................................... 3-1 Layout of the PCBs and Circuit Diagrams ......................... 4-1... 4-22
Chassis Board .............................................................................. 4-1 Oscillograms ................................................................................ 4-8 Deflection H+V ............................................................................ 4-10 Power Supply ............................................................................. 4-11 Signal Board .............................................................................. 4-13 Y/C Processing ........................................................................... 4-15 Audio Board Circuit Diagram ...................................................... 4-17 Audio Board PCB ........................................................................ 4-19 Text ............................................................................................ 4-21 CRT Panel ................................................................................. 4-21
Spare Parts List .................................... 5-1... 5-4
1-2
GRUNDIG Service
ST 03
General Section
Remote Control TRC 1
Remote Control TRC 2
1 4 7
2 5 8 0/AV P+
3 6 9
VOL+
1 4 7
2 5 8 TUNE
3
B A
VOL6 9 STORE VOL+ VOL-
C
S R Q
0/AV
D
AUDIO MENU P+ P-
E F H
P-
MENU
P
TV TEXT/MIX HOLD EXP TUNE STORE LANG 1/2 STEREO TV
O N M L
G
INDEX HOLD EXP TEXT/MIX
I J K
TRC 1
TRC 2
Operation of the Remote Control Keys
Switches the receiver on and off (Standby) 1-0 P+ PVOL+ VOLi MENU STORE TUNE Direct channel selection and direct entry of adjustable settings. Turns television on from Standby. Selects channel above current channel. Increases adjustable menu settings. Selects channel below current channel. Decreases adjustable menu settings. Increases Volume Decreases Volume Displays selected channel number. Accesses hidden information. Accesses Menu Stores channels in tuning mode Selects tuning mode Mutes sound HOLD EXP TEXT/MIX TV 0/AV Holds a particular page in the Teletext mode Changes height of characters in the Teletext mode Selects teletext/selects mixed mode (text on picture) Returns to normal viewing mode Selects auxiliary mode
Operation of the Remote Control Keys
A B C D E F Direct channel selection or page number in teletext mode. Switches the television on from standby. Switches set to standby or switches set on from standby Increases and decreases the volume Displays the selected channel Stores channels in tuning mode Increases or decreases adjustable settings
G Returns to normal viewing mode H I J K L Mutes sound Selects teletext/selects mixed mode (text on picture) Changes height of characters in teletext mode Fasttext buttons Holds a selected page in teletext mode
M Selects index pages in teletext mode N Selects between stereo, stereo-wide and pseudo-stereo
O Selects language in dual language Nicam transmissions. Selects mono sounds. P Accesses menu
Q Accesses audio selections R S Selects tuning mode Selects auxiliary input
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General Section
ST 03
Brief Service Instructions
Tuning Press the "Tune" key on the remote control to bring up the tuning graphic "S". Press and hold the "P+" key for more than 1 second to start the search tuning. When a channel is found the "S" graphic will flash. Either select "P+" to continue tuning or "Store" to retain the channel. By pressing the "Store" key the programme number will flash, key in the programme number that the channel is to be store in. To exit the tuning screen press TV. Fine Tuning Press the "Tune" button and then the "HOLD" key briefly to bring up the fine tuning graphic. An X will appear after the channel number. Use the "P+" and "P-" keys to fine tune and then "Store". Scart Menu Press the "0/AV" button and then the "Tune" key the Scart options graphic will appear, with VCR, DECoder and AUX. In the VCR mode only, the line time base time constant is short. In Decoder mode Pin 8 of the Scart is enabled whilst tuning to allow for tuning of decoded channels.
Fasttext Operation
In addition to the standard Teletext functions, the receiver GT 2105 has Fasttext. This system provides more value from Teletext by allowing fast access to highlighted pages and by linking many related pages for easy access. The key to Fasttext is four colour coded prompts at the bottom of each teletext page. These red, green, yellow and blue prompts relate to the four colour coded buttons on the tv remote control. Each colour coded prompt acts as a "signpost" through the huge choice of Teletext pages available, allowing faster and easier access to highlighted pages. Use of Fasttext To select any colour coded page from Teletext press the corresponding coloured button on the TV remote control. The new page selected will appear almost instantly although there can still be a delay for some pages to appear. This is particularly the case if a rapid succession of coloured Fasttext buttons are pressed. As new pages are accessed, at the bottom of the page a new series of subject related colour coded prompts will appear. Fasttext Index Function To return any time to the main index pages it is not necessary to enter the index page number. INDEX To return to the main index press the INDEX button once. INDEX With the main index on screen a further press of the INDEX button will access the main A - Z index or other subsidiary index pages. Returning to Normal Television Viewing TV To return to normal television viewing at any time, press the TV button.
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GRUNDIG Service 1-5
Operating Hints GT 2005 / 2105
Note: This chapter contains excerpts from the operating instructions. For further particulars please refer to the appropriate user instructions the part number of which is indicated in the relevant spare parts list.
TUNING IN
TUNING Your TV set can memorise 99 different channels. During channel tuning any connected satellite receiver or video recorder should be switched to standby. To tune in different channels, follow the instructions below. Step 1 Press TUNE on the remote control. A tuning bar will appear. Step 2 Press P+ for approximately one second. The set will scan up through the available channel frequencies. A cursor moves slowly up the bar until 'S' a channel is found. The S will now flash on and off. If you do not wish to store the channel, press P+ again until a required channel is found. Step 3 Press STORE to memorise the channel. The programme setting PO1 will now flash on and off. Step 4 Decide which channel number you want to allocate the channel to e.g. BBC1 = 1. Press the appropriate number e.g. 1. Step 5 Store the setting by pressing STORE. The channel is now stored against the chosen channel number. The tuning bar will still be on screen and the S will still flash. Now tune the remaining channels. Repeat steps 2, 3, 4 and 5 until all channels are tuned in. To exit the tuning screen press TV.
FINE TUNING After following the TUNING instructions you should have a clear picture on all channels (subject obviously to the reception quality of the incoming signal). If any channels are not to the standard you would expect, fine tuning may sometimes improve the picture quality. To fine tune follow the steps below: Step 1 Select the channel to be tuned. If the tuning bar is no longer on screen press TUNE. If it is, move onto step 2. Step 2 Press HOLD very briefly. An X will appear besides the programme number to indicate that fine tuning has been selected. Step 3 By briefly pressing P+ or P-, fine tune the picture. Step 4 When the best possible picture has been achieved, press STORE twice to memorise the settings. Step 5 To return to normal television viewing press TV. Note : the X symbol means that the Automatic Frequency Control (AFC) has been switched off. Channels stored with the X displayed may drift off tune and therefore fine tuning should only be used if absolutely necessary. TUNING INTO A VIDEO RECORDER, SATELLITE RECEIVER OR GAMES CONSOLE If connecting a video recorder, satellite receiver or games console to the television set via the scart sockets (see page 3 and 14), press 0/AV on the remote control. Alternate presses of 0/AV selects between the AV inputs, AV1 and AV2.
General Section
5
6
If making the connection via the television sets aerial, x2 select channel 99 as the dedicated channel by pressing 9 twice.
General Section
1-6
With the video recorder, satellite receiver or games console on, tune channel 99 to the output following steps 1-5 in the TUNING IN SECTION on pages 4 to 5. When using the 0/AV mode the on screen display can be adjusted to indicate whether a video recorder, external decoder or auxiliary source (e.g. a games console or satellite receiver) is connected. Follow the steps below selecting first either AV1 or AV2 input as required. Step 1 Press 0/AV on the remote control. Step 2 Press TUNE on the remote control. The display will show 3 options; (vcr) DEC (decoder) AUX (satellite receiver or games console). Step 3 Further pressing of TUNE allows the desired symbol TUNE to be highlighted in yellow. When the required symbol is highlighted the setting will automatically store after five seconds.
To confirm or check the channel being watched without changing channel, press i. The channel number selected will be displayed in the top left hand corner of the screen for approximately 5 seconds. Note : Pressing i will confirm the channel details at the bottom of the screen.
PICTURE ADJUSTMENT
Your Grundig television set allows control of brightness, contrast and colour. To make any picture adjustments follow this procedure : BRIGHTNESS CONTRAST AND COLOUR Step 1 Press MENU. The brightness symbol will be displayed with a cursor which indicates the current brightness setting. Step 2 With the cursor on screen adjust the brightness by using P+ or P-. The cursor moves to indicate the change. The new setting is automatically stored. Step 3 To change the other settings, with the brightness control on screen, press MENU. The brightness symbol before the cursor will change to the contrast setting. Step 4 Adjust the contrast by using P+ or P-. Step 5 With the contrast setting on screen press MENU again. The contrast symbol before the cursor will change to the colour setting. Step 6 Adjust the colour setting to your liking by using P+ and P-.
STANDBY AND CHANNEL CONFIRMATION
STANDBY MODE When the television is in standby it can be switched on by pressing either P+ or P- or by pressing the channel number required, e.g. 1 for BBC 1. Alternatively press STANDBY. CONFIRMATION OF CHANNEL SELECTED Whenever a new channel is selected the top left hand corner of the screen will confirm the channel number selected for approximately 5 seconds.
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8
ST 03
ST 03
GRUNDIG Service 1-7
The cursor will move to indicate the change. To return to normal viewing press TV.
Step 6 With cursor on screen alter the balance in favour of the left or right TV speaker with P+ or P-. Note: If no further buttons are pressed the audio selection screen will disappear within 5 seconds and any changes made will be stored. STEREO WIDE SELECTION Your Grundig NICAM stereo television allows you to enhance the stereo effect from stereo transmissions by selecting Stereo Wide. To select Stereo Wide follow these steps:
AUDIO ADJUSTMENT
VOLUME CHANGE AND MUTE To increase the volume press VOL+. To decrease the volume press VOL-. To mute the sound, press . again.
To restore the sound when muted press
BASS, TREBLE AND BALANCE ADJUSTMENT To make the most of high quality NICAM stereo transmissions you can alter the bass, treble and balance to your preference. Follow these steps: Step 1 Press AUDIO until the audio selection screen is displayed. The bass symbol will be displayed with a cursor which indicates the current bass level selected. Step 2 With the cursor on screen adjust the bass level using P+ or P-. The cursor moves to indicate the change. Step 3 To change the treble level with the audio selection screen displayed press AUDIO until the treble symbol is displayed. Step 4 With the cursor on screen adjust the treble level using P+ or P-. Step 5 To change the balance with the audio selection screen displayed press AUDIO until the balance symbol is displayed.
Step 1 Press STEREO. Either (stereo) or (stereo wide) symbols will appear. Step 2 Repeated presses of STEREO will alternate between stereo and stereo wide allowing the selection of whichever is preferred. Once the required stereo selection is made the on screen symbol will disappear after 5 seconds and the selection will be stored. PSEUDO STEREO SELECTION If the transmission is not in stereo no symbol will be displayed. It is possible to give the mono sound a stereo like sound by following the steps in stereo wide selection above. Either (mono) or (pseudo stereo) can be selected. MONO SOUND SELECTION On the edge of a NICAM stereo transmission area the stereo sound may be intermittent, resulting in poor sound quality, popping and clicking noises. If this is the case the programme can be listened to in mono instead of stereo, by pressing LANG 1/2. The symbol will indicate that mono sound has been selected. A second press will restore the stereo symbol and stereo sound.
General Section
9
10
General Section
1-8
MULTI LANGUAGE OPERATION In the future some television programmes may be transmitted with a choice of language selections. Your Grundig television is ready for this development. If programmes are transmitted in this way, pressing LANG 1/2 will alternatively select between the dual language audio soundtracks which will be in mono.
ADDITIONAL INFORMATION
CARE OF YOUR SET Use only a soft cloth to clean your television set cabinet. Normal window cleaning products can be used to clean the screen. Never use strong detergents, abrasive cleaner or polish to clean either the cabinet or the screen. SCART USAGE If only one SCART connector is to be used it is advisable to use SCART 1. If both are to be used the following use of Scart connections is likely to be most suitable: Products
VCR and Satellite Receiver VCR and Games Console VCR and Hi-Fi Satellite Receiver and Hi-Fi
SETTING THE SLEEP TIMER
Should you fall asleep whilst watching television, or leave the television set on unattended, your Grundig Television set will automatically switch into standby 10 minutes after the end of transmissions. You can however, programme the television to switch into standby between 1 minute and 90 minutes ahead. This ensures that should you fall asleep before the end of a programme, the television set will automatically switch off, instead of remaining on until the end of the last programme of the day. To activate the sleep timer follow these steps: Step 1 Press MENU until the timer off symbol is displayed. Step 2 Press either P+ or P-. The timer on symbol will be displayed along with the time in minutes until the automatic switch off will be activated. Step 3 Press P+ or P- to set the time in minutes until the television set will switch off. Pressing P+ will increase the minutes from 1-90. Pressing P- will decrease the minutes from 90-1. When the correct advanced switch off time is selected, 60 if no further buttons are pressed the set will revert to normal viewing and automatically switch off after the pre-determined time. To ensure that the timer will not activate alter the switch off time to zero.
GRUNDIG Service
Scart 1
VCR Game Hi-Fi Hi-Fi
Scart 2
Satellite Receiver VCR VCR Satellite Receiver
15
11
14
ST 03
ST 03
Circuit Description
Circuit Description
1. Power Supply The power supply is a conventional off line, isolated switch mode system. AC line voltage is applied to the circuit via switch fuse and the main input RFI filter. The degauss coil supply is taken off after the filter then the AC is rectified through a bridge circuit comprising D100 to D103. After filtering by C103 and C104 the DC is now fed to T100 switch mode transformer. TR100 is the switching transistor and it, in turn, is driven by the UC3844 IC100 which is a PWM (Pulse Width Modulation) control IC. In the basic chassis, the UC3844 is run as a fixed frequency PWM controller, the frequency being governed by R105 and C107. 1.1 HT Adjustment VR100 is used to set the +B, this varies the output voltage by controlling the feedback voltage to the IC100. The +B rail is the line measured when this control is used. This line is set in accordance with the CRT that is fitted. When this rail is set then any variation in power demand by the receiver will be reflected in the feedback winding which, in turn, will appear as an error voltage on IC100-(2). This error voltage will, in turn, vary the PWM output to the switching transistor which, in turn, will maintain the output voltage constant. 1.2 Over Current Protection The power supply is totally overcurrent protected by sensing the current through the switching transistor. The combination of R114, R113, D112, D113, R112 and C113 all act to provide conditioning of the sensing voltage for the IC100 current sense input. As current flows across TR100 collector-to-emitter junction (source drain for stereo) a voltage proportional to the current is produced across R114 and R113. This voltage is fed to Pin 3 current sense pin of IC100. When the predetermined threshold voltage is reached because of excess current drawn IC100 limits the current to protect the PSU and other circuits. After a period of time it will try to restart, if the fault has not cleared then it will shut down again. D112 and D113 are there to prevent the voltage developed rising to an unacceptable level on the sense pin of the IC. R112 and C113 provide a degree of filtering of the sense waveform. T100 also provides the isolation from the AC line to the chassis of the TV. All secondary supplies are isolated so that the main - and external connections are at ground potential, therefore, safe to the user. Warning! The heat sink on TR100 is live. 1.3 Supply Regulation The 5V supply for some of the main ICs of the system is supplied from the secondary winding of T100, the 9V output is fed into a fixed 5V voltage regulator. The 33V tuner tuning volts is derived from the +B line using a band gap close tolerance shunt regulator D120. R115 and C114 are isolation components linking the non-isolated to the isolated side of the chassis for RFI and electrostatic purposes. 2. Tuner and Demodulator Circuits The tuner TUN600 can be one of two models depending on what transmission system is being viewed. For the U.K. using PAL System I the tuner is a Salcomp 1590R. For all other European PAL and SECAM systems the tuner is a Salcomp 1490R. Both tuners are pin for pin compatible, the only difference is that the 1590R is UHF only and the 1490R is a multi band tuner. Both tuners are voltage synthesis types and tuning voltage is controlled by the system microcontroller IC500. AGC control of the tuner is determined by the demodulator IC400. 2.1 SAW Filter Options The IF output of both types of tuner is a balanced output and is fed into a number of balanced input saws - SAW450, SAW600 and SAW601. As to which or how many saws are fitted is determined by the options fitted and the system to be received. In the stereo chassis SAW 600 is fitted. However, this can be a different type of SAW depending on the system being received. A system table is presented on the circuit diagram giving the specific type of SAW to be fitted in the 601 position for each system. 2.1.1 SECAM L/L (option) If the chassis is fitted with SECAM L/L the addition of SAW450 is required for the sound. 2.1.2 Stereo SAW Should the full stereo option be required then SAW601 is replaced with SAW600 and SAW450 stays as it is if SECAM L/L is also required. 2.2 Vision IF Demodulator Taking the basic case the outputs from whichever SAW600 or 60 is fed to the IF input of the demodulator IC400-(19), -(20) which is an STV8224. Under most applications there is only one adjustable component in this circuit and that is L401 tank coil. However, when SECAM L/L option is required an additional trim capacitor is required along with R416, C412, D532, R417 and R425. The incoming signal is demodulated in the STV8224. The demodulated video and intercarrier sound are then fed out on pin 3 STV8224. The combined signals are fed into the filter circuits for separation of sound and video. The separation is achieved by the use of ceramic filters. CF400 and CF401 are the filters that perform this task. 2.3 Dual System Sound Options It will be noted that there are two ceramic filters, CF400 and CF401. Both sets are required if dual system operation is required. Details are to be found in the system table on the diagram for each option. The separated signals are then fed back into the IC400 where the sound is demodulated and the audio processed. The video and audio are then routed by the internal switching of IC400. The routing is controlled by the microcontroller. The external video and audio from the Peri connector are also fed into this IC. 2.4 Tuner AGC Control The STV8224 also performs AGC control for the tuner. The operational threshold for AGC action is controlled by the microcontroller, the threshold level is set up on IC400-(24). 2.5 SECAM L/L' Vision IF (option) In the event of SECAM L/L' option being required, then additional IC450 needs to be fitted as does SAW450. This is in order to demodulate the AM sound of SECAM L/L system. Audio switching is then re-routed between IC450 and IC400, this is all done under the system microcontroller software in IC500. The switching network comprising TR450, TR451, TR452, D450 and D451 is for the purpose of switching the SAW transducer with variation in band switching. Because the sound and vision carriers are transposed between Band 1 and Bands III, IV and V, then the balanced IF output has to be switched to the right transducer on SAW450. The switching is again controlled by the system microcontroller IC500. The transducer that is not being used is short circuited by its respective diode. 3. Peritel Output The video out to the Peri connector is taken off before the filtered signal is fed back into IC400. It is then fed to a buffer circuit TR700 and then to pin 19 of the Peri connector. 4. Video Chroma Processing IC800 is the video and chroma processing circuit. All controls are totally under software control. Customer controls can be adjusted from the front panel. The raster correction controls are only accessible in factory set-up and troubleshooting mode set by the system microcontroller. The customer controls are accessed in this mode, or by the conventional remote control. The composite video is fed into IC800-(2). Separation of luma and chroma signals is carried out internally by the sampled data method using clocks generated by the external crystal. This method is used for all decoding processes in the chip. The sample clock is phase locked to the subcarrier for correct colour ident. 5. Delay Line The sample component chroma signals are now fed to a digital, 1 picture line length delay line. The same sample clock is fed to the delay line IC801 as is fed to the IC800 so that phase relationship is maintained within the whole system. 5.1 RGB Matrix and Sync Separator After passing through the delay line it is returned to IC500-(26), -(27) and then mixed with the luma and fed into the matrix circuits to produce the RGB output. The luma signal is also fed through a short delay line
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Circuit Description
ST 03
which is integrated on to the IC800. The sync separation and time base circuits are also integrated on to this chip. Incoming video is stripped of its line and field sync pulses. The horizontal and vertical syncs are then derived from the composite sync waveform. 6. Time Base Generator The line sync is fed to the line time base generator circuit. The line time base is derived from the master clock oscillator and divider circuit. The line pulses from the divider are fed into both PLL circuits along with the sync and flyback pulses. These combine together to produce the line drive for the line output circuit. Two PLL time constants are used to give good lock for both fixed, gen-locked syncs, such as from terrestrial transmission and from weak or variable sync such as VCR. All controls for the line time base generator are integrated and are accessed via the I2C bus under microcontrol from IC500. These are set up in the factory by a test software. 6.1 Vertical Time Base The vertical time base is again generated on chip by the use of the master clock in conjunction with the separated field sync. The divider circuit count is controlled by the sync pulse. The counter produces the pulses to generate the vertical ramp which is in turn fed to a buffer and then fed out to the field output circuit. In the event of no valid sync being present then a direct injection mode is used to continue the function of the ramp generator. This direct mode then enables vertical scan to be maintained in the event of no signal being present. 7. RGB Drivers The RGB video signals are fed out on IC800-(17), -(18), -(19). These signals are then buffered by the emitter follower circuits TR801, TR802 and TR803 before being fed to the tube base panel. External RGB signals are also able to be fed into this IC on pins 22, 23 and 24. These pins are normally fed with RGB levels of 700mVpp signals for nominal display. The choice of display is determined by the switch pin on IC800-(21). This is controlled by the output of the teletext chip blank signal or the blanking signal from the microcontroller for on screen graphics display or the PERITEL pin 8. 7.1 Auto Grey Scale Tracking The system also incorporates an automatic grey scale tracking system. This removes the need for manual adjustments to set up background luma levels in high-light and low-light areas on CRTs. For correct tracking the auto grey scale works on the principal of taking measurements of the dark current during the field blanking period and also inserting a peak white signal in that period and setting those thresholds to control the output stages of the chip. This ensures that the tube characteristics are constantly being matched by the video output so that grey scale and picture colour integrity is constantly maintained. 7.2 Beam Limiter The RGB output gains are also affected by the beam limiter circuit on IC500. This is to prevent the tube from being damaged or its life expectancy being shortened by excessive beam current. The sensing of the beam current is performed at the bottom end of the DST secondary supplying the EHT focus and G2 voltages to the tube. The reference point is pin 7 on the DST, this current is sensed as a change in voltage developed across resistors and fed to the beam limit sense IC800-(9). This voltage is measured against a reference which represents maximum beam current. When the sensing level exceeds the reference then the gain on RGB output amps is reduced, thereby reducing the beam current. Saturation control, brightness and contrast are adjusted via the remote control but the nominal levels are preset in the factory by the I2C bus using the microcontroller and test software. 8. System Microcontroller (IC500) The ST6365 is a dedicated microcontroller for TV control applications. It has such features as dedicated voltage synthesis tuning control, AFC control and on-screen graphics display generator. Also it has a dedicated infrared remote control serial data input. This microcontroller has a dedicated I2C port for communication to other controllable ICs. The controller clock frequency is 8MHz and this clock speed is achieved by connecting an 8MHz ceramic resonator across the oscillator pins 31 and 32 with two 100pF capacitors, C507 and C508, to ground from each pin. The timing for all functions performed by the microcontroller including I2C bus are taken from this clock.
8.1 Voltage Synthesis The on-chip voltage synthesis tuning peripheral has been integrated to allow the generation of a tuning reference voltage. The peripheral is composed of a 14 bit register that represents the tuning voltage at pin 1. This voltage is generated using pulse width modulation and bit rate multiplier techniques. The 14 bit counter gives 16384 steps which allow a resolution of approximately 2mV over a tuning voltage range of 32V. Coarse tuning is achieved by PWM of the 7 most significant bits of the counter, whilst fine tuning is achieved by BRM (Bit Rate Multiplication) of the 7 least significant bits of the counter. The resultant digital pulse train is fed into the base of TR410. This inverts the pulse train which is then fed into the 3 stage integrator which integrates the pulse train into a DC voltage. 8.2 AFC Control The output of the voltage synthesizer can be changed either by the remote control or the local keyboard. The tuner oscillator is kept on frequency by the application of AFC. The AFC acts on the voltage synthesizer via a feedback path. The AFC is generated by IC400. This voltage is fed back to the AFC pin 9 on the controller. As the tuner oscillator drifts either up or down so the signal applied to IC400 deviates from the optimum. As a result an error voltage appears on IC400-(2). This voltage can be either positive or negative with respect to the optimum voltage. This error voltage is fed to pin 9 of the microcontroller. This voltage is then digitized. If the digital value is optimum then no change is made to the synthesized digits. If the digital value is either side of optimum, then the resultant AFC value is either added to or subtracted from the synthesizer value. 8.3 Analog Controls Pins 2 and 5 on the microcontroller are PWM D-A converters. However, these are only 6 bit resolution which is perfectly acceptable for the analog functions they perform. The D-A on pin 2 is used as the electronic volume control for the sound. The D-A on pin 3 is used for the multi-level voltage control for audio and video switching of IC400 and IC450. The D-A on pin 4 is used to produce the threshold level for the AGC to the tuner. The final D-A on pin 5 is as yet uncommitted. The microcontroller has 3 I/O ports as well as the dedicated peripheral pins, some of the I/O ports also have dedicated functions and are listed as their dedicated function, i.e. the AFC on pin 9 is bit 3 of port B. 8.4 Key Pad Interface Bits 0-2 and bits 4-5 of port B provide the matrix for the crosswire keypad. 8.5 Sync Detector/Mute Control Bit 6 of port B is a sense pin which mutes the sound when text is displayed and incoming signal is lost. Normally the microcontroller will mute the sound when the aerial is removed or tuning is off station because it detects no line lock coincidence. However, in out-of-hours sync mode, the text chip set detects lack of sync coincidence and mutes the sound. Bit 0 on port A senses the status of pin 8 on the peri connector for switching video and sound to incoming signals on the peri connector. 8.6 Peritel Monitor/OSG Control Bit 1 on port A monitors the blanking signal on pin 16 of the peri connector and also the blanking signal from text and OSD sources. Bit 2 of port A acts as the control line for the switch that acts on SAW450 as described in section 2. Bit 3 is usually linked to ground, however for System PAL BG/SECAM L/L' this link is omitted. 8.7 Band Switching and LED Driver Bits 4 to 6 of port A are the band switching outputs which drive the band switches. Bit 7 of port A is connected to the LED D500. Pins 22 and 25 are OSG display pins whilst pins 26 and 27 are the sync input pins. Pin 33 is the hardware power-on reset. Pin 34 is the SECAM L/L SAW selector switch. Pin 35 is IR input line. Pin 36 is BG/DK system select. 8.8 Standby Control/ Sound Mute Pin 37 is available as a standby line for external use. In normal standby, the controller shuts down all circuits that provide drive to output stages, thereby placing the system in quiescent current consumption mode. Pin 39 is the sound mute output which drives the sound mute transistor TR5 and TR7. Pins 40 and 41 are the dedicated I2C bus.
2-2
GRUNDIG Service
ST 03
Circuit Description
ST 03
Alignment
9. Output Power Stages This section describes the power output stages for video, audio, line and field scanning system. 9.1 Field Output (IC200) The TDA8170 IC200 is a power output amplifier designed to drive the vertical scan coils on the CRT yoke. The saw-tooth waveform is fed into pin 1 from pin 7 of IC800. Internal to IC200 is the flyback generator. The flyback generator produces a pulse equivalent to the field blanking period during which time no visible video appears on the screen. The saw-tooth voltage waveform is converted to a current waveform that drives the field scan coils. The flyback part of the waveform is also used to generate the vertical sync pulse for the OSD. The circuit R207, D202 and R208 slice the waveform to give the vertical sync pulse and to limit it to a voltage of no greater than 4.7V. 9.2 Line Output Stage The line output stage has to provide a number of things for the system. Firstly, it provides the power and the waveform to drive the horizontal scan coils on the CRT yoke. Secondly, it provides the voltages for the tube, EHT final anode drive, focus voltage and G2. Thirdly, it provides two secondary low tension voltages, 15V and 26V, and after passing through a fixed voltage regulator, IC300, 12V. Fourthly, it provides on the primary side of the transformer the 150/180V supply for the tube base video output amplifiers and, finally the voltage for the heaters on the CRT of around 6.3V. The tuning capacitor C300 is selected by the type of tube fitted as are the correction circuits L300, L301, R300 and R301. 9.3 Line Driver The line drive signal from IC800 is first clamped by D804 then inverted by TR800. The resulting waveform is fed to TR301 line driver stage. The drive is applied to the line output transistor TR302 across the line driver transformer T311. TR302 drives both the diode split transformer T300 and the line scan coils connected to PL351. The field coils are also connected to PL351. 9.4 12V Regulator Circuit The 15V generated off the low side secondary of the diode split LOPT is used in the beam current sensing circuit prior to it being fed into the 12V fixed regulator IC300. From the primary side of the diode split there is a circuit which is used to produce a low level line flyback pulse. This is the circuit around TR300. The flyback pulse is used by the IC800 for synchronization in PLL's and also for the line blanking during video for line flyback period. Also from this circuit is supplied the horizontal sync pulse for the OSD of the microcontroller. 9.5 Flyback Pulse Circuit The flyback pulse is fed into TR300 via two high value resistors R302 and R303. The high values are because at the take-off point the flyback pulse could be in excess of 1kV. The capacitor C306 is a speed-up capacitor to improve turn on and off characteristics of TR300. The diode D305 clamps the incoming flyback pulse to 5V so that the output at the emitter of TR300 does not rise above 5V and that the base of the transistor is not spiked by excessive transient voltages. 10. Video Output Stages The video output transistors TR900, 901, 902 are driven directly from the buffer transistor circuits at the output RGB of IC800. The gain of the stage which determines the video voltage swing applied to the tube cathode is set by a register in IC800. The actual gain control known as contrast is also a register in IC800 as is the brightness control. The capacitors connected across the emitter resistor is to give a little extra gain at the HF end. The transistors TR903, 904, 905 are the dark/light current sense transistors and feed the dark current sense on IC800-(20) for auto grey scale. 10.1 Auto Grey Scale When the video output transistor is driven with peak white which equals max. beam current then the voltage drop across the diodes increases thereby making a difference of potential between base and emitter causing the transistor to conduct. This produces an output by the collector proportional to the high beam current. As the output transistor
GRUNDIG Service
is turned off at black level, so the reverse happens with the sense transistors until we are left with a voltage that represents the dark tube leakage current which is a dark reference current for the tube. 10.2 Tube Base Interconnect Connection to the tube base is via two connectors CN901 and CN902 for the main connectors, then by single connectors for the focus and G2. The final anode voltage is applied directly to the connection on the side of the tube bulb. The tag coating connection is made by a single tag to the tube base panel ground. 11. Teletext Options The text chip-set being used is the Texas Instruments 2 chip Videotext decoder set. Depending on what system is required Eurotext or Unitext determines what IC650 will be. A table of components that change are shown in the "Text Table" on the schematic. IC651 is the data slicer and timing signal generator. The timing signals are all generated with respect to the master clock which is derived from the crystal XT650. The value of this crystal is twice the data rate of the text signal 13.875MHz. This clock is synchronized to the clock run-in signal at the front of the data packet. The data is then output to IC650 along with data clock and the other timing signals. IC650 then decodes the data and produces the text display for the screen. If the TV signal is present then the whole thing is locked to the incoming sync signal. If the TV signal is not present then the system generates its own sync so that text stored in memory can still be displayed in a locked form. All commands and customer selection are engaged via the I2C bus which is attached to the microcontroller I2C bus. The RGB outputs are then fed to the input for external RGB on IC800. The control signal for the blanking function is taken to switch input of IC800-(21). For Eurotext the outputs are directly fed to IC800 whilst buffers are used for Unitext. 12. Power Supply to MSP 3400/3410 Power is supplied to the MSP from pin 4 of plug PL102. This is an 8V supply derived from the chopper transformer and is therefore available when the receiver is in standby. The 8V supply is regulated to 5V by IC3 and applied to the MSP via RFI filters (L2, CT2 and L4, CT4) to pins 18 and 57 of the MSP. The 8V is supplied to pin 39 via the RFI filter L3, CT3. The reason the 8V line operates in standby is because this locks the internal audio switches into pre-set positions when the 5V voltage is removed so as to reduce the standby power. TR4 is open circuit during standby. 12.1 MSP Operation The ITT MSP3410 decodes FM, dual-channel and NICAM sound; the MSP3400 does not do NICAM. The intercarrier input is applied to pin 58 for all systems except France where an additional filter may be required. The input is then to pin 60. The MSP is controlled by the clock and data lines (I2C) from the microcontroller. The IC generates an internal clock from the crystal on pins 62, 63 at 18.432MHz. Reset components are on pin 24. Note there are no adjustments on the MSP as all processing is done digitally. Note, the volume control is now an I2C operation as is treble, bass and balance. 13. Second Peritel and Mute Circuit Video from the second peritel is supplied from pin 20 of Peritel 2. This is then buffered by TR20 and applied to IC4-(1). IC4-(2) carries video derived from the tuner and IF amp. The switch position is controlled by IC4-(10). The microcontroller (pin 5 DA4) controls the switch position. The output of IC4 (pin 15) is applied to the times-2 gain stage TR1, TR2 and out to Peritel 1, input of IC400 -(10) and so to the picture tube if there is no input from Peritel 1. Mute Circuits TR5 and TR7 mute the loudspeaker channels. TR12, 13, 10 and 11 mute the two Peritel audio outputs. The mute circuit is driven by port zero and port 1 (pins 4 and 5) of IC1. Pin 5 mutes the speaker channel and pin 4 the Peritel channels. TR9 detects when the receiver is switched off and mutes all audio outputs. 14. Audio Amplifier The audio amp generates 6+6 watts of RMS power into 8R speakers. The power is derived from a 21 volt winding on the chopper transformer.
Alignment
All adjustment controls not mentioned in this description are adjusted during production and must not be re-adjusted in the case of repairs.
Measuring Instruments: Oscilloscope with 10:1 test probe, colour test pattern, high resistance voltmeter. Service Mode: In this mode the alignment of Geometry, Peak White Level and AGC can be carried out. To call up this mode, either the remote control or TV front controls can be used. Call up Service Mode: To enter the service mode, depress and hold the channel change buttons "P+" and "P-" on the front as the TV is switched on and hold until a picture appears. The service menu will be at the bottom of the screen G L V H R G B A. To choose a function select menu on the remote control or simultaneously depress "V+" and "V-" on the front of the TV, but only briefly. Adjustment of the selected function is by depressing "P+" or "P-". Choosing another function will automatically store the adjustment of the previous function. To return to normal TV mode select TV on the remote control or "V+" or "V-" on the TV.
Checks and adjustments after replacement or repair of: Power Supply: 1., 3. Horizontal Deflection: 2., 3., 6. CRT, CRT-Panel: 2., 4. Tuner: 5. IC1400: 5., 7. IC600: 8.
Alignment 1. +B Voltage
Preparations Set luminance to mimimum. Voltmeter to the cathode of D115. Feed in a crosshatch or TV picture. Brightness (v) Minimum. Contrast ({) Maximum. Select Service Mode "G". Feed in a convergence test pattern: Select "L" in the Service-Mode. Select "V" in the Service-Mode. Select "H" in the Service-Mode. Feed in a FuBK test pattern. Set the colour contrast (i) to minimum. Set the contrast ({) to maximum. Adjust the screen brightness (v) so that the gradation from the darkest grey scale value to black is just still visible. Select "R", "G", or "B" in the Service Mode.
Alignment Process With control VR100 set the voltage +B as specified in the table CRT (page 4-22). Adjust control G2 (at the bottom of the split transformator) so that no red or green square appears on the screen. If the G2 is too high > a red square appears on screen. If the G2 is too low > a green square appears.
2. Screen grid voltage UG2
3. Geometry: Vertical Linearity Vertical Height Horizontal Shift 4. White balance
Adjust with "P+" or "P-". Adjust with "P+" or "P-". Adjust with "P+" or "P-". Set "P+" or "P-" so that no colouration of grey bars is visible.
5. Tuner-AGC
Feed in a standard test pattern at a channel in the upper range of the UHF; the RF should be 3mV (70dBµV, free of noise). Select "A" in the Service Mode. Feed in a convergence test pattern: Contrast ({) to maximum. Set the brightness so that the black background of the test pattern is just brightening. Feed in a convergence test pattern of 38.9MHz (39.5MHz on PAL I) to tuner contact 13 via 1nF. Feed in a convergence test pattern (UHF) on the TV set. Connect the oscilloskop to IC600-(12).
With "P+" or "P-" adjust the voltage on tuner contact 1 to 5.4...5.6V.
6. Line sharpness
With the focus control "FOCUS" (upper adjustment control of the split transformator) adjust the horizontal lines for maximum sharpness.
7. Vision demodulator 8. SAT 6MHz
With filter L401 set the DC level at IC400-(2) to 5.25V.
Adjust L604 to minimum video.
21-1 -3
GRUNDIG Service
31-2 -1
Layout of the PCBs and Circuit Diagrams
ST 03
Layout of the PCBs and Circuit Diagrams
Pos.-Nr./ Pos. No. Koordinaten/ Coordinates X Y Pos.-Nr./ Pos. No. Koordinaten/ Coordinates X Y 30 193 198 180 183 180 173 170 37 35 218 300 11 227 230 232 273 118 197 78 52 59 269 245 256 1 139 216 201 159 195 24 28 15 28 66 66 66 66 19 19 20 255 5 61 61 61 61 251 158 6 6 162 115 139 138 75 18 160 188 221 211 Pos.-Nr./ Pos. No. Koordinaten/ Coordinates X Y 160 199 180 177 141 116 160 193 60 114 89 110 109 107 95 98 78 83 96 81 81 40 63 68 44 45 33 38 58 53 57 197 193 202 202 159 185 238 197 134 126 199 230 219 216 162 146 146 166 155 169 172 173 182 141 141 193 199 127 136 240 240 Pos.-Nr./ Pos. No. Koordinaten/ Coordinates X Y 52 63 79 111 104 112 89 87 43 86 103 101 225 226 246 248 251 253 230 228 223 124 105 222 236 14 162 171 159 18 21 27 147 245 185 28 45 32 69 69 57 122 95 97 131 121 88 88 88 88 131 131 95 16 69 79 131 72 15 30 58 28 48 50 Pos.-Nr./ Pos. No. Koordinaten/ Coordinates X Y 19 24 35 105 152 140 59 84 84 239 269 269 269 269 133 43 20 80 174 25 32 211 34 187 49 182 136 52 52 52 75 31 56 119 86 86 219 102 87 137 123 203 218 130 27 205 120 144 121 89 233 48 8 65 Pos.-Nr./ Pos. No.
ST 03
Koordinaten/ Coordinates X Y
Layout of the PCBs and Circuit Diagrams
Assembly coordinates of the components
The X and Y coordinates can be used as both metric coordinates in mm for the original circuit board and absolute coordinates for the enlarged diagrams of the circuit boards.
L100 L100ALT L101 L102 L103 L300 L300A L301 L302 L303 L400 L401 L450 L500 L540 L550 L551 L600 L601 L602 L603 L604 L650 L651 LNK100 LNK101 LNK450 LNK500 LNK501 LNK502 LNK504
242 238 135 151 98 29 30 52 77 52 102 78 86 242 214 133 130 9 59 23 27 33 159 187 109 108 105 27 24 249 219
174 170 250 171 201 172 175 175 194 175 34 42 97 88 97 13 19 109 99 72 68 73 28 54 200 198 66 106 100 125 71
LNK600 LNK650 LNK651 LNK652 LNK655 LNK656 LNK657 LNK658 LNK700 LNK701 LNK901 OMEGA1 OMEGA2 PIN001 PIN002 PIN003 PIN009 PL102 PL104 PL106 PL107 PL351 PL500 PL501 PL502 PL503 PL550 R100 R101 R103 R105
R109 R110 R113 R114 R115 R116 R117 R118 R119 R120 R121 R130 R131 R132 R200 R206 R209 R210 R211 R212 R213 R300 R301 R302 R303 R311 R312 R313 R314 R315 R316
R317 R318 R350 R406 R419 R420 R422 R423 R426 R452 R460 R511 R512 R516 R524 R525 R526 R527 R528 R533 R540 R550 R556 R561 R562 R602 R650 R653 R656 R705 R706 R707
R708 R709 R715 R720 R831 R832 SAW450 SAW600 SAW601 SW100 SW500 SW501 SW502 SW503 T100 T300 T311 TC400 TR100 TR301 TR302 TR410 TUN600 VR100 VR700 XT650 XT800
Chassis Board
Coordinates of the components on the components side (top side)
Pos.-Nr./ Pos. No. Koordinaten/ Coordinates X Y 239 197 185 179 167 204 195 201 162 192 159 202 139 121 107 122 97 93 129 106 98 98 102 134 118 106 104 156 160 108 84 91 119 81 30 53 79 33 32 52 53 56 37 65 65 77 19 17 65 23 188 170 164 166 163 160 206 217 218 226 177 197 169 174 178 158 183 194 176 208 215 235 228 235 239 239 248 233 194 151 134 137 151 156 161 153 205 129 117 138 189 197 188 194 236 234 120 176 149 242 Pos.-Nr./ Pos. No. Koordinaten/ Coordinates X Y 57 63 91 93 100 58 74 84 61 93 91 79 42 204 204 273 234 94 232 121 132 16 53 13 41 185 196 189 24 22 55 157 160 154 148 126 133 139 116 133 179 179 179 138 149 153 144 126 124 126 40 39 52 31 50 50 64 64 55 118 102 108 100 123 116 160 81 59 87 24 40 108 66 102 106 29 30 32 15 25 56 101 101 101 97 99 99 99 78 71 86 83 81 71 69 69 70 56 48 64 Pos.-Nr./ Pos. No. Koordinaten/ Coordinates X Y 147 144 121 152 87 92 85 8 174 234 98 95 192 184 184 189 170 167 187 183 183 112 104 93 99 123 103 205 105 70 41 48 42 31 75 67 58 58 273 208 213 211 215 223 75 16 213 63 40 98 108 37 37 241 42 110 93 37 37 168 158 153 168 221 194 191 202 185 177 194 212 224 236 244 126 157 238 189 193 128 153 36 35 105 102 184 65 74 68 77 93 33 72 15 Pos.-Nr./ Pos. No. Koordinaten/ Coordinates X Y 117 126 240 116 240 212 192 136 104 11 76 95 235 132 49 178 178 180 145 139 275 18 18 26 26 28 31 31 35 39 39 39 46 46 55 61 64 59 59 62 64 64 68 64 69 74 70 77 72 75 200 231 197 3 217 145 140 141 54 111 108 28 73 49 42 17 85 49 173 69 114 191 32 29 5 7 113 62 64 110 31 35 108 71 54 11 13 45 27 22 73 16 182 90 19 69 Pos.-Nr./ Pos. No. Koordinaten/ Coordinates X Y 77 80 81 85 87 93 92 95 98 95 98 101 102 105 105 107 109 108 108 110 111 112 112 115 115 117 120 119 126 126 129 129 130 131 135 136 136 138 140 143 150 149 150 153 150 152 153 153 153 162 127 69 188 112 20 68 100 72 23 132 174 87 90 72 77 12 61 113 56 12 37 84 12 12 163 112 46 103 119 159 133 104 109 119 132 59 61 119 132 119 14 12 21 18 129 7 9 53 129 127 Pos.-Nr./ Pos. No. Koordinaten/ Coordinates X Y 162 167 167 171 171 171 172 178 180 183 184 187 190 191 192 193 195 197 198 198 200 200 202 203 207 209 211 223 223 235 240 246 255 258 258 260 260 263 289 289 191 255 262 258 248 81 32 213 36 57 74 33 127 25 28 129 85 130 130 103 130 130 118 80 104 202 100 100 220 40 100 82 100 83 104 109 105 84 90 74 87 97 111 66 71 113 87 119 17 31 83 19 87 113 122 175 40 61 155 165
C100 C101 C102 C103 C104 C105 C106 C107 C108 C109 C111 C112 C114 C115 C116 C117 C120 C121 C122 C123 C124 C125 C126 C127 C128 C129 C130 C131 C134 C200 C201 C204 C205 C206 C300 C301 C302 C303 C304 C306 C307 C308 C309 C310 C311 C312 C313 C315 C322 C350
C404 C405 C406 C408 C409 C410 C416 C418 C421 C450 C454 C456 C500 C501 C502 C504 C509 C510 C540 C553 C554 C600 C601 C604 C605 C660 C668 C670 C700 C705 C707 C801 C802 C803 C804 C808 C810 C811 C813 C814 C816 C817 C818 C823 C824 C825 C826 C830 C831 C832
C833 C835 C840 C850 CF400 CF401 CN350 CN700 CN800 CR500 CT400 CT401 D100 D101 D102 D103 D104 D107 D109 D112 D113 D114 D115 D116 D117 D118 D119 D120 D200 D300 D301 D302 D303 D304 D400 D401 D450 D451 D500 D501 D502 D503 D504 D510 D532 D600 DAG
ECO2 ECO4 F100 F101 F101A G2 IC100 IC102 IC200 IC300 IC400 IC450 IC500 IC550 IC600 IC650 IC650ALT IC651 IC800 IC801 IR500 J002 J003 J004 J005 J006 J007 J008 J009 J010 J011 J012 J013 J014 J015 J016 J017 J018 J019 J020 J021 J022 J023 J024 J025 J026 J028 J029
J030 J031 J032 J033 J034 J035 J036 J037 J038 J039 J040 J041 J042 J044 J045 J046 J047 J048 J049 J050 J051 J053 J054 J055 J056 J057 J058 J059 J060 J061 J062 J063 J064 J065 J066 J067 J068 J069 J070 J071 J072 J073 J074 J075 J076 J077 J078 J079 J080 J081
J082 J083 J084 J085 J086 J087 J088 J089 J090 J091 J092 J093 J094 J095 J096 J097 J098 J100 J101 J102 J103 J104 J105 J106 J107 J108 J109 J110 J111 J112 J113 J114 J115 J116 J117 J118 J119 J120 J121 J122 J123 J124 J125 J126 J127 J128 J129 J130 J131 J132
4-1 1-3
GRUNDIG Service
4-2 1-4
GRUNDIG Service
ST 03
Layout of the PCBs and Circuit Diagrams
ST 03
Layout of the PCBs and Circuit Diagrams
Chassis Board
L101
260
MAINS ISOLATION BARRIER
PL102 C130 D118 C127 C128 C129
F101
Component side, top view
CN350
R915
250
C350
D119 C312
D300
PL100
2 1
VR100
R117
R316
R315
240
C311
R130
J101
SW100
C131 T100 C108 10 R103 C109 IC100 C107
C125 C126 D117 C124
230
9
11
9
8
1 2
D104
R131 R132
220
12
10
7
7
8
D116
13
11
14
12
5
4 3
D112
L103
R105 e
C302 T300
210
6
5
C106
c
6
MAINS ISOLATION BARRIER
R113 R114
TR100
R110 C100 D103 D109 R101 D100
L302 D115 J032
C310
16
14
3
3
F100 T2.5A
15
13
C112
4
R118
C134
LNK100 LNK101
R121
C123 4
C121
J097
200
R312 D301 C308 R311 C309 J004
b
D107
D500
D113
2 R116
190
17
15
2
18
16
C307 R350 C120 J128 D114 C116 J040 R301 J025
D302
1
1
L300A C315
R109 C111 C103 C102 L102 C104 C122
180
31
IR500
C101 R100 C105
R300
C115 C114 J056
2
R213 R212 R210
L300
170 21
L301
C117 J061 D101 R115 D102 IC102 C205
IN GND OUT
C504
L100ALT L100
PL351 R211 R206 C200 C206 R209 R302 C306 R303 C322 C301
R528 R533 R512
251004.02-CSSK
C303
J070
J066
J062
PL501 J093 J092 J090 J089 J087 SW502 PL502 D120 TR410 J094 LNK502 J127 PL500 IC500 R516 C501 J080 J076 J071 ebc
IC200
C204 J039 SAW450 C201 J030 R119
J084
25 26
SW503
J081
R313
R120 J069 J065 J060 C450 J048 J057 J059 J064 R452 J033 C456
D303
R314
C502 J120
C304 J009 J012 J015 L600 J003 LNK500 D450 D451 L601 C605 C500 C600 LNK501
28 27 30 29
SW501 SW500
C850 C802 L540 C801 J107 J096 CN800 J091 J063 C803 C811 C804 C810 C840
J118 J126 J115
IC450 J036 R511 R460 J042 J026 C454 L450
J105 J103 J100 J098
CR500
J114
R540 D510 J111 C540 J109
J108
IC800
C808
J125 J119
J088
J104
J110 R527 R526 R525 R524 L500 J113 LNK503 C509 J112 J117 J116 D504 D502 LNK504
J123 J095
J053 C813
J106
J041 SAW600 SAW601 J045 J023 J037 J035 R422 R423 J031 J029 J016
C823
C824 C826 C825
C814 XT800 J044 R556 LNK450 C832 J047 C830 J049 C409 C510
D600 R602 PL503
C816 C817 C818 J082
TUN600
LNK655
LNK656
LNK657
TR542 J130
R656
IC650
L651
C833 R832 J079
J068 J067
C418
C416
C421
C601 C707
L603
J011 J010 R426 R715
L602 J002
J017
D503 D501
LNK658
e bc
IC600
L604
J058
CT401
CF401
C406 CF400
IC400
R709
J102
IC650ALT D401 C405 J083 LNK652 R653 R831 L650 J086 J085 C835 C554 IC550 J051 R420 C408 L400 PL550 L551 LNK651 R650 J074 J075 J072 J073 J078 J077 L550 R550 J034 C553 J055 J054 J050 J046 J038 R406 TC400 J021 J022 J028 J024 J019 J018 D400 D532 C404 J014
J005
R705
R706
L401
VR700
J129
IC801
C831
R419
CT400
R708
C410 J020
R707
C670 C668 LNK650 C660
LNK700 LNK701
LNK600 J006
J013
IC651 XT650
PL106
PL107
J008 J007
280
270
260
250
240
230
220
210 15
200 11
190 12
180 13 16
4-3
170 14
160 10 9
150 8
140 7
130 6
120 5
110 20
100
90 22
80
70 23
60 24
50
40
GRUNDIG Service
GRUNDIG Service
c
MAINS ISOLATION BARRIER
30
b
e
4
3
2
1
D200
R200
C300
J131
160
PL104
1
D304 TR302
150
R317
19
IC300 IN GND OUT T311
140 18
130
ecb C313 TR301
120
17
110
C604
100
90
80
70
CN700
60
50
40
30
C705 C700
20
10
0 20 10 0
Y
X
4-4
C652
R652
R651 C650 C651 C653
C655
C654
C656
C141
C657
D650
R425 R407 R403 C403 R416 R714 C702 C704 R402 C703
C701 R703 R704
C559 R553 C558 R555 R557
R417
R677
SJ400
C402 R404
LNK653
TR550 R400 R654 R655 C666 C659 R676
C663
R701
R401 C401
C836 C827
C664 R658 R663
D651
C662
R659 R661 R667 R670
C415
TR650 C667
C822
D652
TR541
D653
D654
R545
D655
R829
C602
C815
C821 C820 R828
C508
SJ200
C603
C505 C507 R811 R560 C541 R500 R501 R502 R503
R513 R514
R600
C806
R810
D802
TR800
R306
R808 R802 R807
R840 C841
R806 R805 R801
R809
R521
TR451
R721
SJ002
D801
C515
R532
R304 R836
R451
R458
D305
R824
R457
R517
TR452
R509
R505 C119
R534
C207
R208 R207 R201
R203
D202
R204
R205 C118
R310
C320
C113
R108
R112
R106 R107
Solder side, bottom view
Chassis Board
Layout of the PCBs and Circuit Diagrams
220
230
240
250
260
ST 03
C110
D105
190
D108
200
210
170
R531
19
21
140
150
160
180
D306
R515 R530
C202 R202
C321
18
120
R535
R507 R508
C419 R510
R506
17
R504
C305
110
R459
R463
SJ003
R305 C828
TR300
R827
130
Layout of the PCBs and Circuit Diagrams
R111
C542
R307
R541
R812 C805
TR701
D804
C543
R462 C455
R453 R454 TR450 R456 R450 R455 R523
R518 R522 R520
C812
R803
R800
C451
100
TR803
R813
R835 R826
R841
SJ001
R819 R820
TR802
R845 TR801
TR502 C610
TR501 TR500
R601
R804
R461
R519
90
R822 R816
R823 R821 C807 C809
80
C506
70
C860 C861
TR540
R547
R546
R660 R665 R668 R671
D656
TR651
TR652
TR653
D540
C417
C452
60
R657 C665
LNK801
C411 R412 SJ004 C414
C661
R678
50
C678 R673
C400
C834 R830 C557
LNK800
R405 C407
TR700 R718 R722 R717 C706 R716
40
C555
C556
R713 R712 R710 R702
20
R674 C552 C658
10
C135 R542
4-5
Y
30
0
X
0 10 20 30 40 50
24 60
23 70 80
C412
22 90 100
C420
GRUNDIG Service
20 110
C203
5 120
4-6
130
6
C819
7 140
R817
8
R815 D110
150
9
R825
160
10
14 170
16 180
12
C140
190
11
R675
200
13
15 210 220 230 240 250 260 270 280 3 4 2 1 29 30 27 28 26 25 31
ST 03
GRUNDIG Service
ST 03
Layout of the PCBs and Circuit Diagrams
ST 03
Layout of the PCBs and Circuit Diagrams
Chassis Board
Coordinates of the components on the solder side (bottom side)
Pos.-Nr./ Pos. No. Koordinaten/ Coordinates X Y 189 197 144 208 65 189 12 117 115 101 21 14 11 89 93 66 81 99 77 82 74 76 88 219 85 111 106 98 249 241 239 236 241 237 222 222 128 132 146 123 148 137 48 78 64 198 193 180 199 186 221 218 150 126 9 215 15 135 135 137 120 142 138 43 43 32 30 48 52 41 61 64 64 120 83 110 66 109 91 80 93 87 113 103 108 104 23 34 34 47 30 26 74 85 99 10 10 8 14 10 Pos.-Nr./ Pos. No. Koordinaten/ Coordinates X Y 170 177 168 173 182 198 202 187 197 203 186 193 202 18 22 28 24 53 185 152 131 126 149 137 137 130 126 125 132 164 143 132 124 157 162 11 10 22 24 44 59 57 49 47 50 45 64 42 20 28 31 28 48 107 98 90 90 108 80 61 80 80 73 51 109 43 47 105 80 80 87 222 195 207 135 115 147 69 24 54 75 76 75 71 R416 R417 R425 R450 R451 R453 R454 R455 R456 R457 R458 R459 R461 R462 80 77 121 77 78 72 76 66 74 74 60 107 99 99 34 31 22 111 114 101 104 110 109 113 114 110 100 105 Pos.-Nr./ Pos. No. Koordinaten/ Coordinates X Y 168 143 189 147 105 230 186 148 148 168 193 188 194 179 191 121 121 121 121 115 121 130 155 163 155 248 34 88 93 89 97 70 97 121 99 65 106 100 103 171 103 33 48 50 88 224 229 218 202 218 133 138 135 144 148 127 135 112 107 104 106 143 39 39 30 28 36 43 24 56 Pos.-Nr./ Pos. No. Koordinaten/ Coordinates X Y 106 270 270 270 270 268 201 204 207 207 220 221 239 226 253 232 36 27 26 31 31 42 255 277 204 225 229 222 154 237 246 249 145 150 152 239 19 15 196 173 192 187 201 198 189 189 184 198 184 110 108 111 115 117 120 123 120 118 121 123 120 119 123 135 121 103 101 103 106 103 110 137 172 112 126 121 106 12 73 68 68 30 30 30 98 95 95 8 9 39 39 50 49 62 69 62 51 69 Pos.-Nr./ Pos. No. Koordinaten/ Coordinates X Y 179 179 174 174 204 202 201 163 193 192 26 28 32 19 17 23 24 26 23 46 53 50 102 60 139 172 175 178 153 169 168 177 175 181 181 187 186 162 148 152 145 132 135 136 152 141 156 161 140 62 69 62 69 42 17 38 47 32 59 35 40 40 22 25 39 37 33 25 49 46 47 111 49 107 106 104 108 101 106 101 104 99 106 99 96 104 100 89 90 89 96 97 90 88 90 115 116 99 Pos.-Nr./ Pos. No. Koordinaten/ Coordinates X Y
Oscillograms
1
C110 C113 C118 C119 C135 C140 C141 C202 C203 C207 C305 C320 C321 C400 C401 C402 C403 C407 C411 C412 C414 C415 C417 C419 C420 C451 C452 C455 C505 C506 C507 C508 C515 C541 C542 C543 C552 C555 C556 C557 C558 C559 C602 C603 C610 C650 C651 C652 C653 C654
C655 C656 C657 C658 C659 C661 C662 C663 C664 C665 C666 C667 C678 C701 C702 C703 C704 C706 C805 C806 C807 C809 C812 C815 C819 C820 C821 C822 C827 C828 C834 C836 C841 C860 C861
D656 D801 D802 D804 DST-PSU LNK503 LNK653 LNK800 LNK801 MICR-GND R106 R107 R108 R111 R112 R201 R202 R203 R204 R205 R207 R208 R304 R305 R306 R307 R310 R400 R401 R402 R403 R404 R405 R407 R412
R463 R500 R501 R502 R503 R504 R505 R506 R507 R508 R509 R510 R513 R514 R515 R517 R518 R519 R520 R521 R522 R523 R530 R531 R532 R534 R535 R541 R542 R545 R546 R547 R553 R555 R557 R560 R600 R601 R651 R652 R654 R655 R657 R658 R659 R660 R661 R663 R665
R667 R668 R670 R671 R673 R674 R675 R676 R677 R678 R700 R701 R702 R703 R704 R710 R712 R713 R714 R716 R717 R718 R721 R722 R800 R801 R802 R803 R804 R805 R806 R807 R808 R809 R810 R811 R812 R813 R815 R816 R817 R819 R820 R821 R822 R823 R824 R825 R826
R827 R828 R829 R830 R835 R836 R840 R841 R845 SAW SJ001 SJ002 SJ003 SJ004 SJ200 SJ400 TEXT TR300 TR450 TR451 TR452 TR500 TR501 TR502 TR540 TR541 TR542 TR550 TR650 TR651 TR652 TR653 TR700 TR701 TR800 TR801 TR802 TR803
147 125 128 138 145 150 122 130 152 68 72 189 236 68 232 85 166 160 71 77 77 25 29 38 241 237 225 152 190 184 179 174 46 104 152 172 178 184
108 81 75 43 98 112 105 99 95 81 97 106 113 57 88 30
0V
2
0V 0V
0V
1 2
1V/cm, 10µs/cm 10V/cm
3
100V/cm, 10µs/cm
0V 4 500mV/cm, 10µs/cm 5 500mV/cm, 10µs/cm
0V
15 112 109 108 118 96 96 96 68 77 68 35 66 66 66 66 45 103 104 101 99 99
0V 7 500mV/cm, 10µs/cm 8 500mV/cm, 10µs/cm
0V 9 500mV/cm, 10µs/cm
0V
6
500mV/cm, 10µs/cm
11
13
0V 0V
12
0V
14
0V
0V
10 2V/cm, 10µs/cm 11 12 0V 500mV/cm, 200µs/cm
13 14
2V/cm, 100µs/cm 5V/cm Videotext / Teletext
15
1V/cm, 50µs/cm
CHROMA4 122 D105 D108 D110 D202 D305 D306 D540 D650 D651 D652 D653 D654 D655 184 203 147 127 165 57 236 193 200 192 186 179 168
17
0V
0V
18
0V
0V 16 500mV/cm, 20µs/cm 17 18 20V/cm, 20µs/cm
19 2V/cm, 20µs/cm Tastkopf 100:1 Test probe 100:1
0V 20 5V/cm, 5ms/cm
0V 21 10V/cm, 5ms/cm 22 1V/cm, 20µs/cm
0V 23 1V/cm, 20µs/cm
0V 24 1V/cm, 20µs/cm
0V
GRUNDIG Service
4-7 1-1
GRUNDIG Service
41-2 -8
Layout of the PCBs and Circuit Diagrams
ST 03
Layout of the PCBs and Circuit Diagrams
ST 03
Deflection H+V
+B
L302 100uH 0.8A 10% TY LHL08 D300 BA157 ITT R315 TABLE_CRT 1/4W 5% MFF SAFE
1
T300 TABLE_CRT
EHT
0V 25 2V/cm, 5µs/cm 26 2V/cm, 5µs/cm
0V 27 2V/cm, 20µs/cm
0V 28 2V/cm, 5