Sharp 21HM-10F User manual

1
21HM-10F
MODEL 21HM-10F
GA-1E CHASSIS
Issued: 31st October 2001
SERVICE MANUAL
SHARP CORPORATION
SECAM B/G, L/L’ - PAL B/G SYSTEM COLOUR TELEVISION
SEJB21HM10F00
In the interests of user safety (required by safety
regulationsinsomecountries)thesetshouldrestored
to its original condition and only parts identical to
those specified should be used.
This document has been published to
be used for after sales service only.
ELECTRICALSPECIFICATION.........................3
IMPORTANT SERVICING NOTES ...................4
CONTROLS&TERMINALS..............................5
SERVICEADJUSTMENTS................................6
CHASSISLAYOUT...........................................12
LEDFLASHINGCODE....................................13
PRINTED WIRING BOARDS...........................14
ICsADITIONALINFORMATION......................19
SCHEMATIC DIAGRAM, WAVE FORMS........25
BLOCKDIAGRAM...........................................32
TROUBLESHOOTINGTABLES......................35
PARTS LISTING.............................................38
CONTENTS

3
21HM-10F
ELECTRICAL SPECIFICATIONS
•Power Input .......................220V-240 Volts AC 50Hz
•Power Consumption
•Audio Power Output Rating .....................4W (MPO)
Speaker................................16Ω4W, 9 x 5 cm, 1pc
Normal Operation....................................43W
Stand-by Operation...................................3W
•White Level
Set the brightness control, with no signal connected, so that the CRT cathode current is 600mA. The maximum
correction applied to each cathode current to achieve a screen temperature of 8900 degrees K-20 MPCD should
not exceed 15% of its original value.
Convergence.........................Self Converging System
Focus....................................Bi-Potencial Electrostatic
Sweep Deflection...........................................Magnetic
•Picture Intermediate Frecuency..............38.9MHz
•Sound Carrier Trap
L’..........................................................40.4MHz
L...........................................................32.4MHz
B/G.......................................................33.4MHz
•Adjacent Sound Carrier Trap
L’..........................................................32.4MHz
L, B/G...................................................40.4MHz
•Adjacent Picture Carrier Trap
L’..........................................................41.9MHz
L...........................................................30.9MHz
B/G.......................................................30.9MHz
•Aerial Input Impedance
VHF/UHF...........................75 ohm Unbalanced
•Tuning Ranges
L/L’..........................55.75MHz thru 855.25 MHz
B/G.........................48.25MHz thru 855.25 MHz
CATV Special Channels
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.
X Y Screen temperature
0.290±0.015 0.284±0.015 8900º K-20 MPCD

21HM-10F
4
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 discon-
nected 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 30.5 KV,
(at a instantaneous beam current of 1300µΑ).
2. Ensure that during normal operation the EHT does not exceed 25.0 KV±1.5KV (at a beam current of
1100µΑ). This level has been preset in the factory. Always check that this level has not been ex-
ceeded 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
21HM-10F
MENU CH
Power ( ) button
Power/On Timer indicator
Remote Control Sensor
Menu button
Volume U ( )/Down ( ) buttons
Channel U ( )/Down ( ) buttons
1 2 3
4 5 6
7 8 9
0
MENU
TV/VIDEO
TV
CH
CH
Infrared Transm tter W ndow
Aim this window at the infrared sensor
on your TV set
CHILD LOCK ( ) button
TV/VIDEO Select button
Programme Select buttons
MENU button
VOLUME UP ( )/DOWN ( ) buttons
( ) Increases sound
( ) Decreases sound
(These are also used for menu set up)
POWER/STANDBY ( ) button
SOUND MUTE ( ) button
CHANNEL (PROGRAMME) UP ( )/
DOWN ( ) buttons
( ) Selects next higher programme
( ) Selects next lower programme
(These are also used for menu
set up)
S ngle/Double Entry button ( )
CALL button ( )
FLASHBACK ( ) buttons
eturns to previously viewed
programme
Location of Controls
Remote Control
TV Front
Euro-SCART 21-Pin Terminal
1. Audio right output
2. Audio right input
3. Audio left output
4. Common earth for audio
5. Earth for blue
6. Audio left input
7. Blue input
8. Audio-video control
9. Earth for green
10. Not used
11. Green input
12. Not used
13. Earth for red
14. Not used Audio: Mono Input/Output.
21-Pin Euro-
15. Red input
16. Red/Green/Blue
control
17. Earth for video
For greater A/V enjoyment, various audio and video devices may be
connected via the Euro-SCART 21-Pin Terminal.
18. Earth for video
19. VIDEO output
20. VIDEO input
21. Common earth

21HM-10F
6
XXXX:
Adjustment
(Yellow) Value
(Green)
Fig. 3
Fig. 2
SHARP X X VXX.XX
STS0: XXXX XXXX
STS1: XXXX XXXX
STS2: XXXX XXXX
XX:
SERVICE ADJUSTMENT
•SERVICE MODE FUNCTION
All required adjustments for servicing this TV set, may be done in “service mode”, excepting G2 and FOCUS.
HOW TO ACCESS THE SERVICE MODE
1. Turn the receiver on and ensure that it is tuned into a test pattern.
2. Turn the receiver off using the mains switch.
3. Press the volume down and channel up buttons together. See Fig.1.
4. Continue pressing the volume down and channel up buttons while turning
the mains on using the mains switch. See Fig.1.
5. Keep pressing the volume down and channel up buttons until the picture appears.
6. When <<SHARPX X VXX.XX>> appears on the screen, release the two buttons.
7. The receiver is now in the service mode. See Fig. 2.
To move between the various service mode functions, use the channel up and down buttons. See Fig. 3.
Use the volume buttons to change the data to the desired value. See Fig. 3.
The data will be stored automatically when exiting the service mode. To exit the service mode press the standby button
on the remote control or turn the receiver off with the mains switch.
•
•
•
•
4
3
CH
MENU
Fig.1

7
21HM-10F
No. OSD Function Range Initial Default FIX/ADJ
1 AGC AGC Take Over Point 0...63 14 14 ADJ
2 V-LIN Vertical Slope [VS] 0...63 32 32 ADJ
3 V-AMP Vertical Amplitude [VA] 0...63 32 32 ADJ
4 V-CENT Vertical Shift [VSH] 0...63 32 32 ADJ
5 H-CENT Horizontal shift [HS] 0...63 32 32 ADJ
6 H-CENT60 offset to H-CENT for60 Hz 0...31 data(-16..+15) 16 20 FIX
7 EW / / Horizontal Parallelogram [HP] 0...63 32 32 FIX
8 HB Horizontal Bow 0...63 32 32 FIX
9 S-COR S-Correction [SC] 0...63 0 22 FIX
10 DRI-RS White point Red Standard white temp. 0...63 32 42 ADJ
11 DRI-GS White point Green Standard white temp. 0...63 32 42 ADJ
12 DRI-BS White point Blue Standard white temp 0...63 32 42 ADJ
13 DRI-RW White point Red Warm white temp. 0...32 16 16 FIX
14 DRI-GW White point Green Warm white temp. 0...32 16 9 FIX
15 DRI-BW White point Blue Warm white temp. 0...32 16 9 FIX
16 DRI-RC White point Red Cold white temp. 0...32 16 9 FIX
17 DRI-GC White point Green Cold white temp. 0...32 16 9 FIX
18 DRI-BC White point Blue Cold white temp. 0...32 16 16 FIX
19 SUB-VOL Max Volume 0...63 60 60 FIX
20 SUB-CON Sub Contrast 0...63 63 63 FIX
21 SUB-COL Sub Colour 0...63 32 18 FIX
22 SUB-BRI Sub Brightness 0...63 32 36 FIX
23 TINT Sub Tint 0...63 32 32 FIX
24 SUB-SHP Sub Sharpness 0...63 32 18 FIX
•SERVICE ADJUSTMENTS AND DATA LIST
The table below shows the various service mode positions, range of values and default value. The columns are headed
as follows.
Heading: Description:
OSD This is what will appear on the screen when at this position
Function This is the description of the mode’s function
Range This is the range of values that can be entered while in this mode
Initial This is the initial value, i.e. just after changing the NVM
Default This is the recommended default value for this mode
FIX/ADJ If this is ADJ, then it may be necessary to adjust this value away from the default

21HM-10F
8
No. OSD Function Range Initial Default FIX/ADJ
25 HTL-VOL Max Hotel Volume 0...63 30 30 FIX
26 HTL-PRG Hotel Program number 0...99 or > 99 for none 255 255 FIX
27 RGB OSD RGB Reference 0...15 15 0 FIX
28 SEARCH-SYS Sound system for auto turning 0(L-BG),1(BG),2(I),3(DK) 1 0 FIX
29 CUT-R Black Level off-set R [BLR] 0...63 0 0 FIX
30 CUT-G Black Level off-set G [BLB] 0...63 0 10 FIX
31 CDL Cathode Drive Level [CL] 0...15 0 5 FIX
32 DL-PT Y-Delay time for PAL (TV) [YD] 0...15 12 4 FIX
33 DL-ST Y-Delay time for SECAM (TV) [YD] 0...15 15 8 FIX
34 DL-4T Y-Delay time for N443 (TV) [YD] 0...15 12 8 FIX
35 COL-OP COLOUR OFFSET (PAL) 0...15 8 8 FIX
36 COL-OS COLOUR OFFSET(SECAM) 0...15 8 8 FIX
37 COL-O4 COLOUR OFFSET (NTSC443) 0...15 4 4 FIX
38 SHP-OP SHARPNESSOFFSET(PAL) 0...15 8 8 FIX
39 SHP-OS SHARPNESSOFFSET(SECAM) 0...15 4 4 FIX
40 SHP-O4 SHARPNESS OFFSET(NTSC443) 0...15 8 8 FIX
41 SC-VOL SCART volume 0..255 115 115 FIX
42 PRE-SC Prescaler SCART input 0..127 25 25 FIX
43 PRE-FM Prescaler FM/AM 0..127 72 72 FIX
44 PRE-NICAM Prescaler SCART input 0..127 0 0 FIX
45 AVC-DKY AVC Decay 0...3 data(1.2.4.8.) 2 2 FIX
46 AC-OFF-TIM Time to set the AC-OFF 0..15 0 0 FIX
timer is in steps of 10minutes
47 DISP Language or symbols 0(symboles), 0 2 FIX
1(English),
2(French)
48 TXT-EUR Teletext pan-European language 0 (teletext pan-european language) 0 0 FIX
1 (second language;cyrillic)
2(third language;Greek)
49 BKS Black Stretch 0 (disable) or 1 (enable) 1 1 FIX
50 AVC Automatic Volume Control(AVL) 0 (disable) or 1 (enable) 0 1 FIX
51 FFI Fast Filter IF-PLL 0 (disable) or 1 (enable) 0 0 FIX
52 ACL Auto Colour Limit 0 (disable) or 1 (enable) 0 1 FIX
53 S-L Sound system L 0 (disable) or 1 (enable) 0 1 FIX
54 S-DK Sound system DK 0 (disable) or 1 (enable) 1 0 FIX
55 S-I Sound system I 0 (disable) or 1 (enable) 1 0 FIX
56 S-BG Sound system BG 0 (disable) or 1 (enable) 1 1 FIX
57 BLUE-BACK Video mute at Ident loss 0 (disable) or 1 (enable) 1 1 FIX
58 VMC Video Mute at program/source Change 0 (disable) or 1 (enable) 1 1 FIX
59 HTL Hotel mode 0 (disable) or 1 (enable) 0 0 FIX
60 BTSC Reduced FM demodulator Gain (for BTSC sig) 0 (disable) or 1 (enable) 0 0 FIX
61 AV Number of external AV sources 0 for 1 AV or 1 for 2 AV 1 0 FIX
62 FMWS FM Window Selection 0 (disable) or 1 (enable) 0 0 FIX
63 SM0 Sound Mute bit 0 0 (disable) or 1 (enable) 1 1 FIX
64 SM1 Sound Mute bit 1 0 (disable) or 1 (enable) 0 0 FIX
65 AGC0 IF AGC speed bit0 0 (disable) or 1 (enable) 1 0 FIX
66 AGC1 IF AGC speed bit1 0 (disable) or 1 (enable) 0 0 FIX
67 FOA-FE Phi 1 time constant for FE(RF) 0 (disable) or 1 (enable) 0 0 FIX
68 FOB-FE Phi 2 time constant for FE(RF) 0 (disable) or 1 (enable) 0 0 FIX
69 FOA-AV Phi 1 time constant for AV 0 (disable) or 1 (enable) 1 1 FIX
70 FOB-AV Phi 2 time constant for AV 0 (disable) or 1 (enable) 1 1 FIX
71 TXT Teletext 0 (disable) or 1 (enable) 0 0 FIX
72 TXT-WE Teletext Western or Eastern characters 0 (westem) or 1 (eastem) 0 0 FIX
73 FSL Forced V-SYNC slicing level 0 (disable) or 1 (enable) 0 0 FIX
74 HP2 Sync of OSD 0 for Ph1 or 1 for Ph2 0 0 FIX
75 CP Charge pump 0 (fast tuning) or 0 0 FIX
1 (moderate speed tuning)
76 NICAM NICAM decoding enabled 0 (disable) or 1 (enable) 0 0 FIX
77 IGR IGR decoding enabled 0 (disable) or 1 (enable) 0 0 FIX
78 AUTO Start auto tuning at POWER-ON 0 (disable) or 1 (enable) 0 0 FIX
79 TXT-TGL Function of TXT key 0 or 1 0 1 FIX
80 EVG Enable Vertical Guard 0 (disable) or 1 (enable) 1 1 FIX

9
21HM-10F
•SCREEN ADJUSTMENT
1. G2 Adjustment
1. Enter the service mode (see page 6).
2. Use the channel up or channel down buttons to enter the << BLUE-BACK >>
function.
3. Set this to << BLUE-BACK: 0 >>, i.e. blue background is turned off.
4. Turn the set off at the mains.
5. Turn the set back on.
6. Set the picture control settings to normal.
7. Select the SCART input by pressing the TV/SCART button on the remote con-
trol. Do not connect an input to the SCART socket. A blank raster will appear.
8. Connect an oscilloscope to TP851 on the CRT PWB. The waveform as in figu-
re 4 should be displayed.
9. Adjust the G2 control (screen voltage) so that the peak of this waveform is 3.0V
+/-0.1V above the zero volt line.
10. Enter the service mode.
11. Turn the blue background function back on again - set << BLUE-BACK: 1 >>.
12. Turn off the receiver using the mains button.
13. The G2 adjustment is now complete.
2. Focus Adjustment
1. Receive a monoscope pattern signal at a level of 60 to 80 dBµV.
2. Set the picture settings to normal.
3. Adjust the focus potentiometer to obtain maximum definition.
•AGC ADJUSTMENT
1. Tune the receiver into a colour bar signal on channel E-12.
2. Set the RF generator to an output signal strength of 57dBµV (+/-1dBµV) –50 Ohms unbalanced.
3. Connect an oscilloscope to TP201. TP201 is one end of R201.
4. Enter the service mode (see page 6).
5. Use the channel up and channel down buttons to enter the AGC mode.
6. By using the volume up and the volume down buttons, adjust the AGC until the voltage on TP201 drops by 0.1V
to 0.3V below its maximum value.
7. Change the input signal strength to 66-70dBµV and make sure that there is no noise apparent in the picture.
8. Turn the receiver off at the mains, this will exit the service mode and store the adjustment.
9
9GF
9
Fig. 4

21HM-10F
10
•GEOMETRY ADJUSTMENT PROCEDURE
To adjust the geometry, follow the procedure outlined below:
1.Tune the set into a Philips test pattern.
2.Enter the service mode as described on page 6.
3.Use the channel up or channel down buttons to enter the desired mode
4.Use the volume buttons to achieve correct setting.
5.When adjustments are complete, use the standby button to turn off the set. The adjustment values will be stored
at this point.
V-LIN
Adjust the vertical linearity control so that the picture centring is as shown in figure 5.
V-AMP
Adjust the vertical amplitude control so that the picture overscans as shown in figure 6.
V-CENT
Adjust the vertical centring control so that the picture is centred as shown in figure 7.
H-CENT
Adjust the horizontal centring control so that the picture is centred as shown in figure 8.
Fig. 5
Fig. 6
Fig. 7
Fig. 8

11
21HM-10F
•COLOUR ADJUSTMENT PROCEDURE
The following adjustments should only be carried out when the CRT or IC801 are replaced.
NOTES:
•This adjustment must be done after warming up the unit for 30 minutes or longer with a beam current over 700
µA.
•The red value «DRI-RS» should be fixed to 42. (Refer to “How to access service mode” section).
•«DRI-GS» adjustment alters “Y” co-ordinate.
•«DRI-BS» adjustment alters “X” and “Y” co-ordinates.
ADJUSTMENT METHOD 1 (using the signal generator, varying the picture signal)
1. Adjust G2.
2. Input a white pattern with burst signal from SCART.
3. Position the colorimeter in the centre of screen.
4. Adjusting input signal level, select a luminance of 70 nits.
5. Operate again in “service mode“ and select «DRI-GS» and/or «DRI-BS» locations to obtain colour co-ordinates:
6. Re-set the TV with the mains switch button to store the adjustment and exit service mode.
7. Check colour co-ordinates “X” and “Y” at 20 a 120 Nits. It may be necessary to repeat the same procedure to
obtain the above values.
ADJUSTMENT METHOD 2 (using the signal generator, with a fixed picture signal)
1. Adjust G2.
2. Tune a white pattern with burst signal.
3. Operate in “service mode”:
4. Using «SUB-CON», select a luminance of 70 nits.
5. Operate again in “service mode“ and select «DRI-GS» and/or «DRI-BS» locations to obtain colour co-ordinates:
6. Select «SUB-CON». Return data to “63”.
7. Re-set the TV with the mains switch button to store the adjustment and exit service mode.
8. Check colour co-ordinates “X” and “Y” at 20 a 120 Nits. It may be necessary to repeat the same procedure to
obtain the above values.
X Y Screen temperature
0.290±0.015 0.284±0.015 8900º K-20 MPCD
X Y Screen temperature
0.290±0.015 0.284±0.015 8900º K-20 MPCD

13
21HM-10F
LED FLASHING CODE
PURPOSE: The led indicates the power mode,ocurred I2C error and On timer
INPUT: - Current power mode
- I2C Errors
- On timer
Processing: - If in STANDBY mode and On timer in-active then switch LED off.
- If in STANDBY and On timer active
set LED to blinking, (switch on and off at 1 Hz with a 50 % duty cycle).
- If in POWER-ON mode, switch LED on.
- If an I2C error occurred, let the LED blink at 1 Hz, 50 % duty cycle.
For the blinking times see the Table below.
Note: Only when an I2C error occurs for a number of times, or for a number of seconds,
the I2C error is handled by the system (that is ,only then the set will go to standby,
the led starts blinking).
Table Error LED blinking times
SECAM UNIT
IC/Module Name Slave Address Bus Error LED Remarks Ref. No.
Blinking Time
M24C04 A0,A2 2 512x8 EEPROM IC1002
TDA935x/6x/8x 8A 3 Address of internal TV processor IC801
VTST6HD64 or C0 6 PLL Tuner TU201
CTF551 C0 6
CHASSIS LAYOUT

19
21HM-10F
handbook, halfpage
XXX
MXXxxx
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
Fig. 3 Pin configuration (SDIP 64)
TDA935X/6X/8X PS/N2
P1.3/T1 P1.6/SCL P1.7/SDA P2.0/TPMW P3.0/ADC0/PWM0 P3.1/ADC1/PWM1 P3.2/ADC2/PWM2 P3.3/ADC3/PWM3 VSSC/P P0.5 P0.6 VSSA SECPLL VP2 DECDIG
HOUT
FBISO
PH2LF PH1LF GND3 AVL/EWD VDRB VDRA IFIN1 IFIN2
EHTO
IREF VSC TUNERAGC AUDEEM/SIFIN1 DECSDEM/SIFIN2 PLLIF
IFVO/SVO
DECBG
CVBSINT VP1 CHROMA CVBS/Y GND1 AUDOUT/AMOUT
AVL/SNDIF/
BLKIN BO GO RO BCLIN R2/VIN B2/UIN G2/YIN
INSSW2
VDDA VPE VDDC OSCGND XTALIN XTALOUT RESET VDDP P1.0/INT1 P1.1/T0 P1.2/INT0
GND2 AMOUT
AUDEXT/QSSO/
SNDPLL/SIFAGC
REFO/AMOUT
ICs ADITIONAL INFORMATION:TDA9381 (IC801)
QUICK REFERENCE DATA
SYMBOL PARAMETER MIN. TYP. MAX. UNIT
Supply
VPsupply voltages −8.0/3.3 −V
IPsupply current −135/60 −mA
Input voltages
ViVIFrms) video IF amplifier sensitivity (RMS value) −75 −µV
ViSIF(rms) QSS sound IF amplifier sensitivity (RMS value) −60 −µV
ViAUDIO(rms) external audio input (RMS value) −500 −mV
ViCVBS(p-p) external CVBS/Y input (peak-to-peak value) −1.0 −V
ViCHROMA(p-p) external chroma input voltage (burst amplitude)
(peak-to-peak value) −0.3 −V
ViRGB(p-p) RGB inputs (peak-to-peak value) −0.7 −V
ViYIN(p-p) luminance input signal (peak-to-peak value) −1.4 −V
ViUVIN(p-p) U/V input signal (peak-to-peak value) −1.33/1.05 −V
Output signals
Vo(IFVO)(p-p) demodulated CVBS output (peak-to-peak value) −2.5 −V
Vo(QSSO)(rms) sound IF intercarrier output in QSS versions (RMS value) −100 −mV
Vo(AMOUT)(rms) demodulated AM sound output in QSS versions (RMS
value) −500 −mV
Io(AGCOUT) tuner AGC output current range 0 −5mA
VoRGB(p-p) RGB output signal amplitudes (peak-to-peak value) −2.0 −V
IoHOUT horizontal output current 10 −−mA
IoVERT vertical output current (peak-to-peak value) 1 −−mA
IoEWD EW drive output current 1.2 −−mA

21HM-10F
20
ICs ADITIONAL INFORMATION:TDA9381 (IC801)
BLOCK DIAGRAM
SOUND
TRAP
TUNERAGC
+8V
HOUT V-DRIVE
RO GO B0
BCLIN
BLKIN
CVBS/Y
IFIN
AUDOUT
AUDEXT
Block diagram TDA935X/6X8X PS/N2 with mono intercarrier sound demodulator
CHROMA
SDASCL
VISION IF
ALIGNMENT-FREE
PLL DEMOD.
AGC/AFC
VIDEO AMP.
VIDEO SWITCH
VIDEO IDENT.
VIDEO FILTERS
PAL/SECAM/NTSC
DECODER
DEEMPHASIS
AUDIO SWITCH
(AVL)
VOLUME CONTROL
BASE-BAND
DELAY LINE
H/V SYNC SEP.
H-OSC. + PLL
H-DRIVE
2nd LOOP
H-SHIFT
V-DRIVE +
CONTR/BRIGHTN
OSD/TEXT INSERT
CCC
WHITE-P. ADJ.
80C51 CPU
I2C-BUS
TRANSCEIVER
ROM/RAM TELETEXT
ACQUISITION
1/10 PAGE MEMORY
TELETEXT/OSD
DISPLAY
RG BBL
Y U V
HV
REF
ENHANCED
VST PWM-DAC
VST OUT
I/O PORTS
I/O PORTS (4x)
+3.3 V
RESET
LED OUT (2x)
ADC IN (4x)
VPE
(EW GEOMETRY)
GEOMETRY
EHTO EWD R/V G/Y B/U BL
RGB/YUV INSERT
RGB
REF
CVBS
SYNC
H
V
COR
27 37 38
33
(20) 29 28
34
44 60 55 59 58 57
10/11
234
5-8
1+62-64
912 54 56 61
51 52 53
49 50
45
484746
(20)
36
21
222625
16
35
17
31
15
19
14
39 18
41
(32) 13
43
42
40 24
23
RGB/YUV MATRIX
SATURATION
YUV/RGB MATRIX
30
LUMA DELAY
PEAKING
BLACK STRETCH
AGC CIRCUIT
NARROW BAND
PLL
DEMODULATOR
(32)
(32)
SNDIF

21
21HM-10F
ICs ADITIONAL INFORMATION:TDA9381 (IC801)
PINNING
SYMBOL PIN DESCRIPTION
P1.3/T1 1 port 1.3 or Counter/Timer 1 input
P1.6/SCL 2 port 1.6 or I2C-bus clock line
P1.7/SDA 3 port 1.7 or I2C-bus data line
P2.0/TPWM 4 port 2.0 or Tuning PWM output
P3.0/ADC0/PWM0 5 port 3.0 or ADC0 input or PWM0 output
P3.1/ADC1/PWM1 6 port 3.1 or ADC1 input or PWM1 output
P3.2/ADC2/PWM2 7 port 3.2 or ADC2 input or PWM2 output
P3.3/ADC3/PWM3 8 port 3.3 or ADC3 input or PWM3 output
VSSC/P 9 digital ground for µ-Controller core and periphery
P0.5 10 port 0.5 (8 mA current sinking capability for direct drive of LEDs)
P0.6 11 port 0.6 (8 mA current sinking capability for direct drive of LEDs)
VSSA 12 analog ground of Teletext decoder and digital ground of TV-processor
SECPLL 13 SECAM PLL decoupling
VP2 14 2nd supply voltage TV-processor (+8V)
DECDIG 15 decoupling digital supply of TV-processor
PH2LF 16 phase-2 filter
PH1LF 17 phase-1 filter
GND3 18 ground 3 for TV-processor
DECBG 19 bandgap decoupling
AVL/EWD (1) 20 Automatic Volume Levelling /East-West drive output
VDRB 21 vertical drive B output
VDRA 22 vertical drive A output
IFIN1 23 IF input 1
IFIN2 24 IF input 2
IREF 25 reference current input
VSC 26 vertical sawtooth capacitor
TUNERAGC 27 tuner AGC output
AUDEEM/SIFIN1(1) 28 audio deemphasis or SIF input 1
DECSDEM/SIFIN2(1) 29 decoupling sound demodulator or SIF input 2
GND2 30 ground 2 for TV processor
SNDPLL/SIFAGC(1) 31 narrow band PLL filter /AGC sound IF
AVL/SNDIF/REF0/
AMOUT(1) 32 Automatic Volume Levelling / sound IF input / subcarrier reference output /AM output
(non controlled)
HOUT 33 horizontal output
FBISO 34 flyback input/sandcastle output
AUDEXT/
QSSO/AMOUT(1) 35 external audio input /QSS intercarrier out /AM audio output (non controlled)
EHTO 36 EHT/overvoltage protection input
PLLIF 37 IF-PLL loop filter
IFVO/SVO 38 IF video output / selected CVBS output
VP1 39 main supply voltage TV-processor (+8 V)
CVBSINT 40 internal CVBS input
GND1 41 ground 1 for TV-processor
CVBS/Y 42 external CVBS/Y input
CHROMA 43 chrominance input (SVHS)
AUDOUT /AMOUT(1) 44 audio output /AM audio output (volume controlled)

21HM-10F
22
ICs ADITIONAL INFORMATION:TDA9381 (IC801)
Note
1. The function of pin 20, 28, 29, 31, 32, 35 and 44 is dependent on the IC version (mono intercarrier FM demodulator
/ QSS IF amplifier and East-West output or not) and on some software control bits. The valid combinations are given
in table 1.
2. The vertical guard function can be controlled via pin 49 or pin 50. The selection is made by means of the IVG bit in
subaddress 2BH.
Table 1 Pin functions for various versions
Note
1. When additional (external) selectivity is required for FM-PLL system pin 32 can be used as sound IF input. This
function is selected by means of SIF bit in subaddress 28H.
2. The reference output signal is only available for the CMB1/CMB0 setting of 0/1. For the other settings this pin is a
switch output (see also table 67).
INSSW2 45 2nd RGB / YUV insertion input
R2/VIN 46 2nd R input / V (R-Y) input
G2/YIN 47 2nd G input / Y input
B2/UIN 48 2nd B input / U (B-Y) input
BCLIN 49 beam current limiter input / (V-guard input, note 2)
BLKIN 50 black current input / (V-guard input, note 2)
RO 51 Red output
GO 52 Green output
BO 53 Blue output
VDDA 54 analog supply of Teletext decoder and digital supply of TV-processor (3.3 V)
VPE 55 OTP Programming Voltage
VDDC 56 digital supply to core (3.3 V)
OSCGND 57 oscillator ground supply
XTALIN 58 crystal oscillator input
XTALOUT 59 crystal oscillator output
RESET 60 reset
VDDP 61 digital supply to periphery (+3.3 V)
P1.0/INT1 62 port 1.0 or external interrupt 1 input
P1.1/T0 63 port 1.1 or Counter/Timer 0 input
P1.2/INT0 64 port 1.2 or external interrupt 0 input
IC version FM-PLL version QSS version
East-West Y/N N Y N Y
CMB1/CMB0 bits 00 01/10/11 00 01/10/11 00 01/10/11 00 01/10/11
AM bit −− − − −01 −01
Pin 20 AVL EWD AVL EWD
Pin 28 AUDEEM SIFIN1
Pin 29 DECSDEM SIFIN2
Pin 31 SNDPLL SIFAGC
Pin 32 SNDIF(1) REFO(2) AVL/SNDIF(1) REFO(2) AMOUT REFO(2) AMOUT REFO(2)
Pin 35 AUDEXT AUDEXT QSSO AMOUT AUDEXT QSSO AMOUT
Pin 44 AUDOUT controlled AM or audio out
SYMBOL PIN DESCRIPTION

23
21HM-10F
ICs ADITIONAL INFORMATION:TEA1507 (IC701)
ndbook, full pagewidth
SUPPLY
MANAGEMENT
internal
supply UVLO start
M-level
VCC 1
2
3
GND S1
CTRL
FREQUENCY
CONTROL
VOLTAGE
CONTROLLED
OSCILLATOR
LOGIC
LOGIC
OVER-
VOLTAGE
PROTECTION
OVERPOWER
PROTECTION
short
winding
soft
start
S2
OVER-
TEMPERATURE
PROTECTION
SQ
R
UVLO Q
MAXIMUM
ON-TIME
PROTECTION
POWER-ON
RESET
−1
VALLEY
TEA1507
100 mV
clamp
DRIVER
START-UP
CURRENT SOURCE
0.75 V
0.5 V
5Isense
6DRIVER
MGU230
4DEM
8DRAIN
7HVS
n.c.
OCP
LEB
blank
Iss
2.5 V
burst
detect
Block diagram.
PINNING
SYMBOL PIN DESCRIPTION
VCC 1 supply voltage
GND 2 ground
CTRL 3 control input
DEM 4 input from auxiliary winding for
demagnetization timing, OVP and OPP
Isense 5 programmable current sense input
DRIVER 6 gate driver output
HVS 7 high voltage safety spacer, not
connected
DRAIN 8 drain of external MOS switch, input for
start-up current and valley sensing
handbook, halfpage
MGU231
TEA1507
1
2
3
4
VCC
GND
CTRL
DEM
DRAIN
HVS
DRIVER
Isense
8
7
6
5
Pin configuration.

21HM-10F
24
ICs ADITIONAL INFORMATION:AN7523 (IC303)
ICs ADITIONAL INFORMATION:AN5522(IC501)
1 2 3 4 5 6 7 8 9
V
CC
Output
GND
Output
Standby
Input
GND
N.C.
Volume
Pin No. Description
1 Vcc
2 Ch Output (+)
3 GND
4 Ch Output (-)
5 Standby
6 Ch Input
7 GND (Input)
8 N.C
9 Volume
Circuit Function Block Diagram Pin Descriptions
Note: Do not apply voltage or current to NC pin from outside
Pin No. Pin Name
1 InvertingInput
2 PowerSupply
3 Pump-up Output
4 GND
5 Vertical Output
6 Vertical Output Power Supply
7 Non-invertingInput
Pin Descriptions
Non-inverting Input
Output Vcc
Output
GND
Pump Up Out
Vcc
Inverting Input
1234567
Pump Up
Thermal Protection
Amp +
-
Circuit Function Block Diagram

25
21HM-10F
WAVEFORM MEASUREMENT CONDITION:
Colour bar genetator signal of 70 dB from RF input.
DESCRIPTION OF SCHEMATIC DIAGRAM
1. The unit of resistance «ohm»is omitted (K=1000
ohms. M= Megaohm).
2.All resistorsare1/16 watt.unless otherwisenoted.
3. All capacitors areµF, unless otherwise noted (P=
µµF).
4. The capacitor with Part No. RC-FZ9XXXBMNJ is
designed to with stand 63V.
5. The capacitor with Part No. RC-FZ4XXXBMNJ is
designed to with stand 50V.
NOTE:
SERVICE PRECAUTION:
THE AREA ENCLOSED BY THIS LINE ( )
IS DIRECTLY CONNECTED WITH AC MAINS
VOLTAGE.
WHEN SERVICING THE AREA, CONNECT AN
ISOLATING TRANSFORMER BETWEEN TV
RECEIVER AND AC LINE TO ELIMINATE
HAZARD OF ELECTRIC SHOCK.
CAUTION
This circuit diagram is original one,
therefore there may be slight difference
from yours.
IMPOTANT SAFETY NOTE:
PARTSMARKED WITH « » ( )ARE
IMPORTANT FOR MAINTAINING THE SAFETY
OF THE SET. BE SURE TO REPLACE THESE
PARTSWITHSPECIFIEDONESFOR MAINTAIN-
INGTHESAFETY ANDPERFORMANCEOFTHE
SET.
!
SAFETY NOTE:
1. DISCONNECT THE AC PLUG FROM THE AC
OUTLET BEFORE REPLACING PARTS.
2.SEMICONDUCTORHEATSINKSSHOULDBE
REGARDED AS POTENTIAL SHOCK HAZARDS
WHEN THE CHASSIS IS OPERATING.
WAVEFORMS:

21HM-10F
26

35
21HM-10F
TROUBLESHOOTING TABLES.
Check F701. Blown out.
Abnormal Normal Re lace the fuse.
Check R701 Q701. Check T701 in16 voltage. The fuse is again blown out.
and IC701 (A rox. 290V at 220V AC)
Check IC701,D701,D702,
Normal D703,D704 and C705.
Check Secondary Main+B.
Abnormal (A rox. 110V) Normal
YES
Check D758,IC702,IC753 Check CRT connector K1- D1001 (Power LED Bright Red)
and D762. K5 bias. turns on.
NO
Normal Normal Abnormal NO
D1001 (Power LED Dark Red)
Check R615. Check Check turns on
C878. IC801.
Checking the
D1001 turns on rotector circuit.
brightly and darkly.
(Bus error)
NVM
(IC1002)
See many often D1001 TV PROCESSOR
flashes in red. (IC801)
This indicates which IC to
check u . TUNER
(TU201)
NO RASTER