Sharp 21v1-l Service Manual

							 
SERVICE MANUAL
COLOUR TELEVISION
Chassis No. GA6
21V1-L
In the interests of user safety (Required by safety regulations in some countries) the set should be restored to its original 
condition and only parts indentical to those specified should be used.
S8811021V1L
MODEL
ELECTRICAL SPECIFICATIONS
Chassis No. GA8
CONTENTS
 IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................................... 1-1Page
 LOCATION OF USER’S CONTROL  ...................................................................................................................... 2-1
 INSTALLATION AND SERVICE INSTRUCTIONS .................................................................................................  3-1
 SERVICE MODE ..................................................................................................................................................... 4-1
 ADJUSTMENT METHOD ........................................................................................................................................ 5-1
 WAVEFORMS ......................................................................................................................................................... 6-1
 CHASSIS LAYOUT ................................................................................................................................................. 7-1
 BLOCK DIAGRAM .................................................................................................................................................. 8-1
 DESCRIPTION OF SCHEMATIC DIAGRAM .......................................................................................................... 9-1
 SCHEMATIC DIAGRAMS ......................................................................................................................................10-1
 PRINTED WIRING BOARD ASSEMBLIES ........................................................................................................... 11-1
 Parts Guide 
POWER  INPUT............................AC 110-220 V, 50/60 Hz  
POWER RATING .....................................................76W
PICTURE SIZE .............................1,239 cm
2(192sq inch)
CONVERGENCE .............................................  Magnetic
SWEEP DEFLECTION .................................. .. Magnetic 
FOCUS ......................................................... Electrostatic
 
INTERMEDIATE FREQUENCIES
    Picture IF Carrier Frequency ...................... 45.75 MHz
    Sound IF Carrier Frequency ......................  41.25 MHz
    Color Sub-Carrier Frequency ......................42.17 MHz
                                                                         (Nominal)
AUDIO POWER
    OUTPUT RATING... ...................... 3.0 W(RMS) x 1pc
 SPEAKER
    SIZE ........................................................ 2” X 3.5”, 1pc
    VOICE COIL IMPEDANCE .................16 ohm at 400 Hz
ANTENNA INPUT IMPEDANCE
    VHF/UHF ........................................75 ohm Unbalanced
TUNING RANGES
   VHF-Channels ................................................. 2 thru 13
    UHF-Channels ................................................14 thru 69
    CATV Channels ............................................. 1 thru 125
                                                 (EIA, Channel Plan U.S.A.)
Specifications are subject to change without
prior notice.
SHARP CORPORATION
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
21V1-L 
						

							21V1-L
1 – 1
TV 21V1-L
Service Manual
21V1-L
Market
E CHAPTER 1. IMPORTANT SERVICE SAFETY PRECAUTION
IMPORTANT SERVICE SAFETY PRECAUTION
Service work should be performed only by qualified service technicians who are
thoroughly familiar with all safety checks and the servicing guidelines which follow:
X-RADIATION AND HIGH VOLTAGE LIMITS
1. Be sure all service personnel are aware of the
procedures and instructions covering X-radiation.
The only potential source of X-ray in current solid
state TV receivers is the picture tube. However, the
picture tube does not emit measurable X-Ray
radiation, if the high voltage is as specified in the
High Voltage Check instructions.
It is only when high voltage is excessive that X-
radiation is capable of penetrating the shell of the
picture tube including the lead in the glass material.
The important precaution is to keep the high voltage
below the maximum level specified.
2. It is essential that servicemen have available at all
times an accurate high voltage meter.
The calibration of this meter should be checked
periodically.
3. High voltage should always be kept at the rated value
−no higher. Operation at higher voltages may cause
a failure of the picture tube or high voltage circuitry
and;also, under certain conditions, may produce
radiation in exceeding of desirable levels.
4. When the high voltage regulator is operating properly
there is no possibility of an X-radiation problem.
Every time a color chassis is serviced, the brightness
should be tested while monitoring the high voltage
with a meter to be certain that the high voltage does
not exceed the specified value and that it is regulating
correctly.
5. Do not use a picture tube other than that specified
or make unrecommended circuit modifications to the
high voltage circuitry.
6. When trouble shooting and taking test
measurements on a receiver with excessive high
voltage, avoid being unnecessarily close to the
receiver.
Do not operate the receiver longer than is necessary
to locate the cause of excessive voltage.
WARNING
1. For continued safety, no modification of any circuit
should be attempted.
2. Disconnect AC power before servicing.
3. Semiconductor heat sinks are potential shock
hazards when the chassis is operating.
4. The chassis in this receiver has two ground systems
which are separated by insulating material. The non-
isolated (hot) ground system is for the B+ voltage
regulator circuit and the horizontal output circuit. The
isolated ground system is for the low B+ DC voltages
and the secondary circuit of the high voltage
transformer.
To prevent electrical shock use an isolation
transformer between the line cord and power
receptacle, when servicing this chassis.
SERVICING OF HIGH VOLTAGE SYSTEM
AND PICTURE TUBE
When servicing the high voltage system,
remove the static charge by connecting a
10k ohm resistor in series with an insulated
wire (such as a test probe) between the pic-
ture tube ground and the anode lead. (AC
line cord should be disconnected from AC
outlet.)
1. Picture tube in this receiver employs integral
implosion protection.
2. Replace with tube of the same type number for
continued safety.
3. Do not lift picture tube by the neck.
4. Handle the picture tube only when wearing
shatterproof goggles and after discharging the high
voltage anode completely.

 
						

							21V1-L
1 – 2
SAFETY NOTICE
Many electrical and mechanical par ts in television
receivers have special safety-related characteristics.
These characteristics are often not evident from visual
inspection, nor can protection afforded by them be
necessarily increased by using replacement components
rated for higher voltage, wattage, etc.
Replacement parts which have these special safety
characteristics are identified in this manual; electrical
components having such features are identified by 

and shaded areas in the Replacement Parts Lists and
Schematic Diagrams.
IMPORTANT SERVICE SAFETY PRECAUTION
(Continued)
1. Inspect all lead dress to make certain that leads are
not pinched or that hardware is not lodged between
the chassis and other metal parts in the receiver.
2. Inspect all protective devices such as non-metallic
control knobs, insulating materials, cabinet backs,
adjustment and compartment covers or shields,
isolation resistor-capacity networks, mechanical
insulators, etc.
3. To be sure that no shock hazard exists, check for
leakage current in the following manner.
Plug the AC cord directly into a 110~220 volt AC
outlet, (Do not use an isolation transformer for this
test).
Using two clip leads, connect a 1.5k ohm, 10 watt
resistor paralleled by a 0.15µF capacitor in series
with all exposed metal cabinet parts and a known
earth ground, such as electrical conduit or electrical
ground connected to earth ground.
Use an AC voltmeter having with 5000 ohm per volt,
or higher, sensitivity to measure the AC voltage drop
across the resistor.
BEFORE RETURNING THE RECEIVER
(Fire & Shock Hazard)
Before returning the receiver to the user, perform
the following safety checks.Connect the resistor connection to all exposed metal
parts having a return to the chassis (antenna, metal
cabinet, screw heads, knobs and control shafts,
escutcheon, etc.) and measure the AC voltage drop
across the resistor.
AII checks must be repeated with the AC line cord
plug connection reversed. (If necessary, a non-
polarized adapter plug must be used only for the
purpose of completing these check.)
Any current measured must not exceed 0.5 milliamp.
Any measurements not within the limits outlined
above indicate of a potential shock hazard and
corrective action must be taken before returning the
instrument to the customer.
For continued protection, replacement parts must be
identical to those used in the original circuit. The use of
substitute replacement parts which do not have the same
safety characteristics as the factory recommended
replacement parts shown in this service manual, may
create shock, fire, X-radiation or other hazards.
DVM
AC SCALE
1.5k ohm
10W
TO EXPOSED
METAL PARTSCONNECT TO
KNOWN EARTH
GROUND
•
•
•• 
						

							21V1-L
2 – 1
TV 21V1-L
Service Manual
21V1-L
Market
E CHAPTER 2. LOCATION OF USERS CONTROL
[1] LOCATION OF USERS CONTROL 
						

							21V1-L
3 – 1
TV 21V1-L
Service Manual
21V1-L
Market
E CHAPTER 3. INSTALLATION AND SERVICE INSTRUCTIONS
CIRCUIT PROTECTION
The receiver is protected by a 3.15A fuse (F701),
mounted on PWB-A, wired into one side of the AC
line input.
X-RADIATION PROTECTOR CIRCUIT TEST
After service has been performed on the horizontal
deflection system, high voltage system, B+ system,
test the X-Radiation protection circuit to ascertain
proper operation as follows:
1. Apply 110~220V AC using a variac transformer for
accurate input voltage.
2. Allow for warm up and adjust all customer controls
for normal picture and sound.
3. Receive a good local channel.
4. Connect a digital voltmeter to C602 +ve and make
sure that the voltmeter reads 20±1.1V.
5. Apply external 27V DC at C602 +ve by using an
external DC supply, TV must be shut off.
6. To reset the protector, unplug the AC cord and make
a short circuit between C602 -ve and C602 +ve.
Now make sure that normal picture appears on the
screen.
7. If the operation of the horizontal oscillator does not
stop in step 5, the circuit must be repaired before the
set is returned to the customer.
HIGH VOLTAGE CHECK
High voltage is not adjustable but must be checked
to verify that the receiver is operating within safe
and efficient design limitations as specified checks
should be as follows:
1. Connect an accurate high voltage meter between
ground and anode of picture tube.
2. Operate receiver for at least 15 minutes at 110~220V
AC line voltage, with a strong air signal or a properly
tuned in test signal.
3. Enter the service mode and set Y-mute ON by using
Service R/C.
4. The voltage should be approximately 27.5kV (at zero
beam).
If a correct reading cannot be obtained, check circuitry
for malfunctioning components. After the voltage test,
make Y-mute off to the normal mode.
INSTALLATION AND SERVICE INSTRUCTIONS
Note: (1) When performing any adjustments to resistor controls and transformers use non-metallic
screwdrivers or TV alignment tools.
(2) Before performing adjustments, the TV set must be on at least 15 minutes. 
						

							21V1-L
4 – 1
TV 21V1-L
Service Manual
21V1-L
Market
E CHAPTER 4. SERVICE MODE
SERVICE MODE
Adjustment mode
Setting mode
First mode of service when entering by
SERVICE key.
First mode of service when entering by
2 local keys.
Option mode
Confirmation mode
1. Service mode is switched by SERVICE key, CH UP + VOL DOWN when reset.
2. Service mode is cancelled by SERVICE key during Service mode.
3. Service mode can be switched to the following 5 modes via MENU key:
4BîDuring Service mode, AFT operation is prohibited. The setting data for PLL is always set to fo data.
5BîDuring Service mode, the following user data are set to default value and stored as last memory.
PICTUREBïTINTBïCOLORBïBRIGHTBïSHARPBïCOLOR TEMP.
BASSBïTREBLEBïBALANCEBïMTSBïFA OBïSPEAKERBïENERGY SAVE
6BîDuring Service mode, OSD display for ON/OFF is toggled via [CH CALL] key.
B¶At display OFF condition, if changing adjustment data, channel, input source, it remains display OFF.
B¶At display OFF condition, if changing adjustment item, it returns to display ON.
7BîDuring Service mode, the following operation are prohibited.
CLOSED CAPTIONBïNo signal BLUE SCREEN
8BîDuring Service mode, sound is muted(only MTSIC) except when selecting the following items.
V24, M01
NVM Edit mode 
						

							21V1-L
4 – 2
Adjustment Mode Items
Data Service Mode Function Range Default Data
V01 SUB-CON CONTRAST 0~127 127
V02 SUB-TINT TINT 0~127 64
V03 SUB-COL COLOR 0~127 64
V04 SUB-BRI BRIGHT 0~255 128
V05 SUB-SHP-PRE VIDEO-TONE(PRE) 0~63 41
V06 SUB-SHP-OVER VIDEO-TONE(OVER) 0~63 41
V07 V-SHIFT V-SHIFT 0~7 4
V08 H-SHIFT H-PHASE 0~31 16
V09 RF-AGC RF-DELAY 0~127 127
V10 V-SIZE V-SIZE 0~63 32
V11 V-SHIFT50 V-SHIFT(OFFSET) -7~+7 0
V12 H-SHIFT50 H-PHASE(OFFSET) -15~+15 0
V13 V-SIZE50 V-SIZE(OFFSET) -31~+31 0
V14 VIF-VCO VIF-VCO 0~63 32
V15 R-CUT R-CUTOFF 0~255 127
V16 G-CUT G-CUTOFF 0~255 127
V17 B-CUT B-CUTOFF 0~255 127
V18 R-DRI R-DRIVE 0~127 64
V19 B-DRI B-DRIVE 0~127 64
V20 SUB-COLOR-YUV COLOR 0~127 64
V21 SUB-TINT-YUV BASEBAND-TINT 0~127 64
V22 CC-POS CC-POS 0~255 32
V23 SCREEN CUT OFF CUT OFF 0~2 0
V24 SUB-VOL A-ATT0~127 (O20=0)
0~255 (O20=1)127
255
V25 H-VCO H-VCO 0~7 4
V26 S-TRAP S-TRAP ADJ 0~127 64
V27 VS-CORRECT VS-CORRECTION 0~63 36
V28 VS-CORRECT50 VS-CORRECTION -13~+13 0
V29 V LINEARITY V-LINEARITY 0~63 35
V30 V LINEARITY50 V-LINEARITY -13~+13 0
V31 PARABOLA E/W PARABOLA 0~63 32
V32 PARABOLA50 E/W PARABOLA -13~+13 0
V33 TRAPEZIUM E/W TRAPEZIUM 0~63 32
V34 TRAPEZIUM50 E/W TRAPEZIUM -13~+13 0
V35 H-SIZE E/W H-SIZE 0~63 32
V36 H-SIZE50 E/W H-SIZE -13~+13 0
V37 UPPER CORNER E/W UPPER CORNER 0~63 32
V38 UPPER CORNER50 E/W UPPER CORNER -13~+13 0
V39 LOWER CORNER E/W LOWER CORNER 0~63 32
V40 LOWER CORNER50 E/W LOWER CORNER -13~+13 0
V41 ANGLE ADJ ANGLE ADJ 0~63 31
V42 ANGLE ADJ50 ANGLE ADJ -13~+13 0
V43 BOW ADJ BOW ADJ 0~63 31
V44 BOW ADJ50 BOW ADJ -13~+13 0
V45 S-TRAP ADJ START S-TRAP ADJ 0~127 25
V46 S-TRAP STOP S-TRAP ADJ 0~127 95
M01 MTS-ATT DIRECT OUT LEVEL ADJ 0~15 10
:w:w:w:wNoteBñBéV23 = 1 … HORIZONTAL MODE
V23 = 2 … Y-MUTE MODE
:w:w:w:wNoteBòBéV24BúThese registers are set to maximum value. 
						

							21V1-L
4 – 3
AUTO ADJUSTMENT
H-VCO
RF-AGC
PIF-VCO


1. When there is H-VCO auto adjustment key input at item
H-VCO, auto adjustment will be implemented.
2. H-FREE (1chip) is set to 1.
3. H-OUT (1chip) is set by intelligent monitor output.
4. IM input becomes TIM input.
5. H-VCO (1chip) data is changed so that the number is 126 inside 8ms interval.
6. When adjustment is completed, OSD display and H- VCO auto adjustment data of EERPOM are updated.
7. H-FREE
(1chip), intelligent monitor ou tput, IM input mode are recovered.
1. If there is RF-AGC auto adjustment key input at item RF-AGC, auto adjustment will be implemented.
2. AGC-OUT (MONITOR(1chip)is set by intelligent monitor output.
3. IM input becomes AD input.
4. RF-AGC(1chi p) is decreased from current RF-AGC value to 0, the maximum AFT input voltage is obtained.
5. RF-AGC(1chip) is increased until at the point of AFT input voltage is (max. 0.3V), adjustment is completed.
6. When adjustment is completed, OSD display and RF GC auto adjustment status in EEPROM are updated.
7. Intelli
gent monitor output, IM input mode are recovered.
1. If there is PIF-VCO auto adjustment key input at item PIF- VCO, auto adjustment will be implemented.
2. VIF-DEF (1chip) is set to 1.
3. AFT output (1chip) is set by intelligent monitor output.
4. IM input becomes AD input.
5. VIF-VCO (1chip) is changed so the input voltage becomes 2.5V.
6. When adjustment is completed, OSD display and PIF-VCO auto adjustment status in EEPROM are updated.
7. VIF-DEF
(1chip)intelligent monitor output, IM input mode are recovered.
S-TRAP
1. If there is S-TRAP auto adjustment key input at item S-TRAP, auto adjustment will be implemented.
2. S-TRAP OUTPUT is set by intelligent monitor output.
3. IM input becomes AD input.
4. S-Trap (1chip) is set to the value of V45(S-TRAP ADJ Start).
5. S_Trap_Result is set to the value of V45(S-TRAP ADJ Start).
6. S-Trap (1chip) is increased until the minimum input voltage becomes minimum.
7. Wait 20ms before sampling the new_ AD_data.
8. When adjustment is completed, OSD display and S-TRAP auto adjustment status in EEPROM are updated.
9. S-TRAP
(1chip)intelligent monitor output, IM input mode are recovered. 
						

							21V1-L
4 – 4
Setting Mode Items
Data Service Mode Function Range Default Data
F01 ABCL-Gain ABCL-G 0/1 0
F02 SHP-AV-PRE VIDEO-TONE (PRE) -16~+16 0
F03 SHP-YUV-PRE VIDEO-TONE (PRE) -16~+16 0
F04 SHP-P-PRE VIDEO-TONE (PRE) -31~+31 0
F05 SHP-N3-PRE VIDEO-TONE (PRE) -31~+31 0
F06 SHP-AV-OVER VIDEO-TONE (OVER) -16~+16 0
F07 SHP-YUV-OVER VIDEO-TONE (OVER) -16~+16 0
F08 SHP-P-OVER VIDEO-TONE (OVER) -31~+31 0
F09 SHP-N3-OVER VIDEO-TONE (OVER) -31~+31 0
F10
SHP ANT-ON II OFFSETVIDEO-TONE -15~0 -10
F11 RGB-CLIP EXTRGB-CLIP 0/1 0
F12 E-SAVE CONTRAST(OFFSET) 0~63 30
F13 FAO-VOL A-ATT
0~127 (O20=0)
0~255 (O20=1)120
246
F14 VIF-G VIF-GAIN 0~7 5
F15 YDL-TV Y-DELAY 0~7 5
F16 YDL-TV-P Y-DELAY 0~7 5
F17 YDL-TV-N3 Y-DELAY 0~7 5
F18 YDL-AV Y-DELAY 0~7 5
F19 YDL-AV-P Y-DELAY 0~7 5
F20 YDL-AV-N3 Y-DELAY 0~7 5
F21 YDL-YUV Y-DELAY 0~7 0
F22 TINT-AV TINT(OFFSET) -32~+32 6
F23 COL-AV COLOR(OFFSET) -32~+32 0
F24 COL-P COLOR(OFFSET) -31~+31 24
F25 COL-N3 COLOR(OFFSET) -31~+31 0
F26 R-R R-DRI(OFFSET) -32~+32 3
F27 R-B R-DRI(OFFSET) -32~+32 -2
F28 B-R B-DRI(OFFSET) -32~+32 -8
F29 B-B B-DRI(OFFSET) -32~+32 6
F30 GAMMA GAMMA 0~3 1
F31 BS-D BS-DISCHARGE 0~3 0
F32 BS-C BS-CHARGE 0~3 0
F33 SL-TV S-SLICE DOW N 0~7 2
F34 SL-AV S-SLICE DOW N 0~7 2
F35 SL-YUV S-SLICE DOW N 0~7 0
F36 AFC2 AFC2-G 0/1 0
F37 VD-TV VSYNC-DET 0~7 5
F38 VD-AV VSYNC-DET 0~7 7
F39 VD-YUV VSYNC-DET 0~7 1
F40 AS-TV AUTO-SLICE 0/1 1
F41 AS-AV AUTO-SLICE 0/1 1
F42 AS-YUV AUTO-SLICE 0/1 0
F43 FBP-TV FBP VTH 0/1 0
F44 FBP-AV FBP VTH 0/1 0
F45 FBP-YUV FBP VTH 0/1 0
F46 C.Clip Level C.CLIP LEVEL 0/1 0
F47 CP CP 0/1 1
F48 CC LEVEL CC LEVEL 0~31 0
F49 OSD POS-H OSD POS 0~31 0
F50 OSD POS-V50 OSD POS 1~55 38
F51 OSD POS-V60 OSD POS 1~50 23
F52 OFFSET-ADJ-COLOR COLOR -32~+32 10
F53 OFFSET-ADJ-TINT TINT -32~+32 2
F54
WAIT=X
MD=X
TIMER
(SLOW MODE) 0/1 1 
						

							21V1-L
4 – 5
F55 R-CUT-YUV R-CUT (OFFSET) -63~+63 0
F56 G-CUT-YUV G-CUT (OFFSET) -63~+63 0
F57 B-CUT-YUV B-CUT (OFFSET) -63~+63 0
F58 R-DRI-YUV R-DRI (OFFSET) -63~+63 0
F59 B-DRI-YUV B-DRI (OFFSET) -63~+63 0
F60 CONTRAST OFFSET CONTRAST(OFFSET) -63~+63 0
F61
CONTRAST YUV OFFSETCONTRAST(OFFSET) -63~+63 0
F62 BRIGHT OFFSET BRIGHT (OFFSET) -63~+63 0
F63 BRIGHT AV2 OFFSET BRIGHT (OFFSET) -15~+15 1
F64 BRIGHT YUV OFFSET BRIGHT (OFFSET) -63~+63 0
F65 TRAP
TRAP-FINE 0~3 2
F66 TRAP-PTRAP-FINE 0~3 2
F67 TRAP-N3TRAP-FINE 0~3 2
F68 AFC1-Gain-TVAFC1-G
0~3 0
F69 AFC1-Gain-AVAFC1-G
0~3 3
F70 AFC1-Gain-YUVAFC1-G
0~3 3
F71 OM-DETOM-Det 0/1 0
F72BS-Gain 0/1 0
F73 C-ANGLEC.ANGLE 0/1 0
F74V-DL Fine 0~3 0
F75U-DL Fine 0~3 0
F76 AS-SPEED-DNAS-SPEED-DN 0/1 0
F77 AS-SPEED-UPAS-SPEED-UP 0/1 0
F78 CR-PEDESTEL-ADJCr Pedestal Adj. 0~15 8
F79 CB-PEDESTEL-ADJCb Pedestal Adj. 0~15 8
F80 SIF-BPF-W IDESIF BPF W IDE 0~7 3
F81 SIF-BPF-W IDE-LOWSIF BPF W IDE LOW
0/1 0
F82 SIF-BPF-W IDE-HIGHSIF BPF W IDE HIGH
0/1 0
F83 COL-SYSTEMCOL-SYSTEM
0: 11XX (AUTO)
1: 0011 (PAL-M)
2: 0111 (PAL-N)
3: 0110 (N358)
3
F84 Pow-Storage
CONTRAST/BRIGHTNESS
INCREASE GRADUALLY
0/1 1
F85 SIF45 GAIN DOW NSIF45 GAIN DOW N 0/1 0
F86 S-TRAP OFFS-Trap 0/1 1
F87 BASS OFFSETBASS -4~+4 0
F88 MID1 OFFSETAUDIOEQMID1 -4~+4 0
F89 MID2 OFFSETAUDIOEQMID2 -4~+4 0
F90 MID3 OFFSETAUDIOEQMID3 -4~+4 0
F91 TREBLE OFFSETTREBLE -4~+4 0
F92 AVL LEVELAUDIO AVL LEVEL 0~3 0
F93 AVL OPTIONAVL ON
0: fix to 0
1: fix to 1
2: AVL in
SOUND MENU
2
F94 AU-ATT AMPAU ATTOUT GAIN 0 (0dB)/1(3dB) 0
F95 OSD LEVELOSD LEVEL
0: 10%
1: 30%
2: 50%
3: 70%
4: 90%
3
F96 R MTX UPRMTXUP 0/1 0
F97 MATRIX ADJMATRIX ADJ 0~3 0
Setting Mode Items (Continued)
BS-Gain
V-DL
U-DL