Akai 29ct24fs schematic
COLOUR TV SET
Models:
29CT24FS
29CT71FS
SERVICE MANUAL
www.akai.ru
SERVICE MANUAL
TABLE OF CONTENTS
SPECIFICATIONS............................................................................................................. 1
SAFETY INSTRUCTIONS AND MAINTENANCE......................................... 2
X-RAY RADIATION PRECAUTION.......................................................................................... 2
SAFETY PRECAUTION.............................................................................................................. 2
PRODUCT SAFETY NOTICE.................................................................................................... 3
SAFETY SYMBOL DESCRIPTION........................................................................................... 3
MAINTENANCE............................................................................................................................ 4
ADJUSTMENTS.................................................................................................................. 5
SET-UP ADJUSTMENTS ........................................................................................................... 5
CIRCUIT ADJUSTMENTS.......................................................................................................... 8
STRUCTURE AND CHASSIS FUNCTION DESCRIPTION.................... 18
STRUCTURE BLOCK DIAGRAM ............................................................................................. 18
BLOCK DIAGRAM FOR SUPPLY VOLTAGE SYSTEM ...................................................... 19
CHASSIS DESCRIPTION ...........................................................................................................20
SERVICE DATA .................................................................................................................21
TECHNICAL DATA OF KEY ICS ...............................................................................................21
SERVICE DATA OF KEY ICS ....................................................................................................43
REPLACEMENT OF PARTS.......................................................................................................46
APPENDIX
1. CIRCUIT DIAGRAM
2. FINAL ASSEMBLY DIAGRAM
3. FINAL WIRING DIAGRAM
4. PRINTED CIRCUIT BOARD LAYOUTS
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SPECIFICATIONS
Number 29CT24FS, 29CT71FS
Model
SERVICE MANUAL
Table 1 Specifications
Color system
RF system
system B/G, D/K
Sound
Video system PAL4.43, SECAM, NTSC3.58, NTSC4.43 (50/60Hz)
Programs preset 236(0-235)
Antenna input
Picture tube (Approx.)
Effective screen dimensions
Video/Audio inputs
Power source 170-260V ~, 50Hz
Weight (Approx.) 30kg
Video/Audio outputs
Rated power consumption 110 W
Designs and specifications are subject to change without notice.
Composite-3; component-1; S-video-1
PAL, SECAM
75 (unbalanced)
478 363mm
Composite - 1
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SERVICE MANUAL
INSTRUCTIONS FOR SERVICE SAFETY AND MAINTENANCE
WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY
RADIATION PRECAUTION”, “SAFETY PRECAUTION”AND “PRODUCT
SAFETY NOTICE”INSTRUCTION BELOW.
X-RAY RADIATION PRECAUTION
1. The EHT must be checked every time the TV is serviced to ensure that the CRT does not emit
X-ray radiation as result of excessive EHT voltage. The maximum EHT voltage permissible in
any operating circumstances must not exceed the rated value. When checking the EHT, use
the High Voltage Check procedure in this manual using an accurate EHT voltmeter.
2. The only source of X-RAY radiation in this TV is the CRT. The TV minimizes X-RAY radiation,
which ensures safety during normal operation. To prevent X-ray radiation, the replacement
CRT must be
3. Some components used in this TV have safety related characteristics preventing the CRT from
emitting X-ray radiation. For continued safety, replacement component should be made after
referring the PRODUCT SAFETY NOTICE below.
4. Service and adjustment of the TV may result in changes in the nominal EHT voltage of the
CRT anode. So ensure that the maximum EHT voltage does not exceed the rated value after
service and adjustment.
identical to the original fitted as specified in the parts list.
SAFETY PRECAUTION
WARNING: REFER SERVICING TO QUALIFIED SERVICE PERSONNEL ONLY.
1. The TV has a nominal working EHT voltage. Extreme caution should be exercised when
working on the TV with the back removed.
1.1 Do not attempt to service this TV if you are not conversant with the precautions and procedures
for working on high voltage equipment.
1.2 When handling or working on the CRT, always discharge the anode to the TV chassis before
removing the anode cap in case of electric shock.
1.3 The CRT, if broken, will violently expel glass fragments. Use shatterproof goggles and take
extreme care while handling.
1.4 Do not hold the CRT by the neck as this is a very dangerous practice.
2. It is essential that to maintain the safety of the customer all power cord forms be replaced
exactly as supplied from factory.
3. Voltage exists between the hot and cold ground when the TV is in operation. Install a suitable
isolating transformer of beyond rated overall power when servicing or connecting any test
equipment for the sake of safety.
4. When replacing ICs, use specific tools or a static-proof electric iron with small power (below
35W).
5. Do not use a magnetized screwdriver when tightening or loosing the deflection yoke assembly
to avoid electronic gun magnetized and decrement in convergence of the CRT.
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SERVICE MANUAL
6. When remounting the TV chassis, ensure that all guard devices, such as nonmetal control
buttons, switch, insulating sleeve, shielding cover, isolating resistors and capacitors, are
installed on the original place.
7. Replace blown fuses within the TV with the fuse specified in the parts list.
8. When replacing wires or components to terminals or tags, wind the leads around the terminal
before soldering. When replacing safety components identified by the international hazard
symbols on the circuit diagram and parts list, it must be the company-approved type and must
be mounted as the original.
9. Keep wires away from high temperature components.
PRODUCT SAFETY NOTICE
CAUTION: FOR YOUR PROTECTION, THE FOLLOWING PRODUCT SAFETY NOTICE
SHOULD BE READ CAREFULLY BEFORE OPERA TING AND SERVICING THIS TV SET.
1. Many electrical and mechanical components in this chassis have special safety-related
characteristics. These characteristics are often passed unnoticed by a visual inspection and
the X-ray radiation protection afforded by them cannot necessarily be obtained by using
replacements rated at higher voltages or wattage, etc. Components which have these special
safety characteristics in this manual and its supplements are identified by the international
hazard symbols on the circuit diagram and parts list. Before replacing any of these components
read the parts list in this manual carefully. Substitute replacement components which do not
have the same safety characteristics as specified in the parts list may create X-ray radiation.
2. Do not slap or beat the cabinet or CRT, since this may result in fire or explosion.
3. Never allow the TV sharing a plug or socket with other large-power equipment. Doing so may
result in too large load, causing fire.
4. Do not allow anything to rest on or roll over the power cord. Protect the power cord from being
walked on, modified, cut or pinched, particularly at plugs.
5. Do not place any objects, especially heavy objects and lightings, on top of the TV set. Do not
install the TV near any heat sources such as radiators, heat registers, stove, or other
apparatus that produce heat.
6. Service personnel should observe the SAFETY INSTRUCTIONS in this manual during use and
servicing of this TV set. Otherwise, the resulted damage is not protected by the manufacturer.
SAFETY SYMBOL DESCRIPTION
The lightning symbol in the triangle tells you that the voltage inside this product
may be strong enough to cause an electric shock. Extreme caution should be
exercised when working on the TV with the back removed.
This is an international hazard symbol, telling you that the components identified
by the symbol have special safety-related characteristics.
FDA This symbol tells you that the critical components identified by the FDA marking
have special safety-related characteristics.
UL
This symbol tells you that the critical components identified by the UL marking
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SERVICE MANUAL
have special safety-related characteristics.
C UL
This symbol tells you that the critical components identified by the C-UL marking
have been evaluated to the UL and C-UL standards and have special
safety-related characteristics.
VDE
MAINTENANCE
1. Place the TV set on a stable stand or base that is of adequate size and strength to prevent it
2. Do not install the TV set in a place exposed to rain, water, excessive dust, mechanical
3. Allow enough space (at least 10cm) between the TV and wall or enclosures for proper
4. Slots and openings in the cabinet should never be blocked by clothes or other objects.
5. Please power off the TV set and disconnect it from the wall immediately if any abnormal
6. Unplug the TV set from the wall outlet before cleaning or polishing it. Use a dry soft cloth for
This symbol tells you that the critical components identified by the VDE marking
have special safety-related characteristics.
from being accidentally tipped over, pushed off, or pulled off. Do not place the set near or
over a radiator or heat register, or where it is exposed to direct sunlight.
vibrations or impacts.
ventilation.
condition are met, such as bad smell, belching smoke, sparkling, abnormal sound, no
picture/sound/raster. Hold the plug firmly when disconnecting the power cord.
cleaning the exterior of the TV set or CRT screen. Do not use liquid cleaners or aerosol
cleaners.
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SERVICE MANUAL
ADJUSTMENTS
SET-UP ADJUSTMENTS
The following adjustments should be made when a complete realignment is required or a new
picture tube is installed.
Perform the adjustments in the following order:
1. Color purity
2. Convergence
3. White balance
Notes:
① The purity/convergence magnet assembly and rubber wedges need mechanical
positioning. Refer to Fig1, 2.
② For some picture tubes, purity/ convergence adjustments are not required.
1. Color Purity Adjustment
Preparation:
Before starting this adjustment, adjust the vertical sync, horizontal sync, vertical amplitude and
focus.
1.1 Face the TV set north or south.
1.2 Connect the power plug into the wall outlet and turn on the main power switch of the TV set.
1.3 Operate the TV for at least 15 minutes.
1.4 Degauss the TV set using a specific degaussing coil.
1.5 Set the brightness and contrast to maximum.
1.6 Counter clockwise rotate the R /B low brightness potentiometers to the end and rotate the
green low brightness potentiometer to center.
1.7 Receive green raster pattern signals.
1.8 Loosen the clamp screw holding the deflection yoke assembly and slide it forward or backward
to display a vertical green zone on the screen. Rotate and spread the tabs of the purity magnet
around the neck of the CRT until the green zone is located vertically at the center of the screen.
1.9 Slowly move the deflection yoke assembly forward or backward until a uniform green screen is
obtained.
1.10 Tighten the clamp screw of the assembly temporarily. Check purity of the red raster and blue
raster until purities of the three rasters meet the requirement.
2. Convergence Adjustment
Preparation:
Before attempting any convergence adjustment, the TV should be operated for at least 15
minutes.
2.1 Center convergence adjustment
2.1.1 Receive dot pattern.
2.1.2 Adjust the brightness/contrast controls to obtain a sharp picture.
2.1.3 Adjust two tabs of the 4-pole magnet to change the angle between them and red and blue
vertical lines are superimposed each other on the center of the screen.
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SERVICE MANUAL
Fig. 1
Yok
2.1.4 Turn both tabs at the same time keeping the angle constant to superimpose red and blue
horizontal on the center of the screen.
2.1.5 Adjust two tabs of the 6-pole magnet to superimpose red/blue line and green line.
2.1.6 Remember red and blue movement. Repeat steps 2.1.3)～2.1.5) until optimal convergence is
obtained.
2.2 Circumference convergence adjustment
2.2.1 Loosen the clamp screw holding the deflection yoke assembly and allow it tilting.
2.2.2 Temporarily put the first wedge between the picture tube and deflection yoke assembly.
Move front of the deflection yoke up or down to obtain better convergence in circumference.
Push the mounted wedge in to fix the yoke temporarily.
2.2.3 Put the second wedge into bottom.
2.2.4 Move front of the deflection yoke to the left or right to obtain better convergence in
circumference.
2.2.5 Fix the deflection yoke position and put the third wedge in either upper space. Fasten the
deflection yoke assembly on the picture tube.
2.2.6 Detach the temporarily mounted wedge and put it in either upper space. Fasten the
deflection yoke assembly on the picture tube.
2.2.7 After fastening the three wedges, recheck overall convergence and ensure to get optimal
convergence. Tighten the lamp screw holding the deflection yoke assembly.
3. White Balance Adjustment
Generally, white balance adjustment is made with professional equipment. It’s not practical to
get good white balance only through manual adjustment. For TVs with I
the bus data to adjust white balance.
2
C bus control, change
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SERVICE MANUAL
Fig. 2
4-pole Magnet Movement 6-pole Magnet Movement
Center Convergence by Convergence Magnets
Incline the Yoke Up (or Down) Incline the Yoke Right (or Left)
Circumference Convergence by DEF Yoke
Fig.3
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SERVICE MANUAL
CIRCUIT ADJUSTMENTS
Preparation:
Circuit adjustments should be made only after completion of set-up adjustments.
Circuit adjustments can be performed using the adjustable components inside the TV set. For TVs
2
with I
C bus control, first change the bus data.
1. Degaussing
A degaussing coil is built inside the TV set. Each time the TV is powered on, the degaussing
coil will automatically degauss the TV. If the TV is magnetized by external strong magnetic field,
causing color spot on the screen, use a specific degausser to demagnetize the TV in the
following ways. Otherwise, color distortion will be shown on the screen.
1.1 Power on the TV set and operate it for at least 15 minutes.
1.2 Receive red full-field pattern.
1.3 Power on the specific degausser and face it to the TV screen.
1.4 Turn on the degausser. Slowly move it around the screen and slowly take it away from the TV.
1.5 Repeat the above steps until the TV is degaussed completely.
2. Confirmation and Adjustment for Voltage
Caution: +B voltage has close relation to high voltage. To prevent X-ray radiation, set +B
voltage to the rated value.
2.1 Power on the TV and receive Philips test pattern.
2.2 Check the resistors and coils for being burned. (If the fuse is burned out, do not power on the
TV again until the cause is found out.)
2.3 ---Measure voltages of test points with the digital voltmeter. Measure the CRT high voltage with
the high-voltage testing equipment and heater voltage with the high-frequency effective
voltmeter. The rated values are shown as below.
Table 2
Test Point Voltage (V) Test Point Voltage (V)
Negative of VD871
Positive of C879 5±0.5V Positive of C412 9±0.5V
Positive of C882 9±0.5V Negative of VD872 16±1V
Positive of C117 32±1V Negative of VD873 16±1V
Negative of VD402A 12.5±1V Negative of VD874 16±1V
Negative of VD404 27±1.5V Negative of VD403 190±5.0V
Heater 6.3+0.2\-0.3Vrms CRT anode 29.5±1.2KV
3. High Voltage Inspection
Caution: No high voltage adjustment components inside the chassis. Please perform
high voltage inspection in the following ways.
3.1 Connect a precise static high voltmeter to the second anode (inside the high voltage cap) of the
CRT.
3.2 Plug in the supply socket (150-250V, AC) and turn on the TV. Set the brightness and contrast
82V±5V in standby
134±1.5V in use
Positive of C414 5±0.5V
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SERVICE MANUAL
to minimum (0μA).
3.3 The high voltage reading should be less than the limited EHT voltage.
3.4 Change the brightness from minimum to maximum, and ensure high voltage not beyond the
limitation in any case.
Nominal EHT voltage: 29.5±1.2KV Limited EHT voltage: 32KV
4. Focus Adjustment
Caution: Dangerously high voltages are present inside the TV. Extreme caution should
be exercised when working on the TV with the back removed.
4.1 After removing the back cover, look for the FBT on the main PCB. There should be a FCB on
the FBT.
4.2 Power on the TV and preheat it for 15 min.
4.3 Receive a normal TV signal. Rotate knob of the FCB until you get a sharp picture.
Before Adjusting After Adjusting
Fig. 4
5. Safety Inspection
5.1 Inspection for insulation and voltage-resistant
Perform safety test for all naked metal of the TV. Supply high voltage of 3000V AC, 50Hz (limit
current of 10mA) between all naked metal and cold ground. Test every point for 3 sec. and
ensure no arcing and sparking.
5.2 Requirements for insulation resistance
Measure resistance between naked metal of the TV and feed end of the power cord to be
infinity with a DC-500 high resistance meter and insulation resistance between the naked metal
and degaussing coil to be over 20MΩ.
6. SERVICE mode
6.1 To enter the SERVICE mode
Set the volume to 0 by the remote control. Then press and hold the MUTE button on the
remote control and MENU button on the TV at the same time for over 2 seconds. In the S mode,
ress the POWER button to quit the S mode. p
S
(“S”is red and other items are yellow.)
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SERVICE MANUAL
Use the ↓/↑buttons on the remote control to highlight an adjustment and the ←/→ buttons
to adjust it.
The POS+/-,↑/↓/←/→,1~6, RECALL, VOL+/-, MUTE and POWER buttons on the remote
control function in the S mode, but 100+, 7, 8, 9 and 0 buttons not.
6.2
Adjustments for Service mode and design mode
Table 3
：
Bit Function Description Status
MODE0
MODE1
MODE2
Bit7.6 Audio system options (available during auto search
Bit5 Function switchover for CPU’s Pin 61 0: External mute 1: Audio system switchover
Bit4 V MUTE When changing channels: 0: Y- mute 1: RGB mute
Bit3
Bit2
Bit1 SECAM 0: No 1:Yes
Bit0 Fixed to 00
Bit7 Write-in LOGO option 0: No 1:Yes
Bit6 Power-on modes 0: Memory on 1: Soft on
Bit5 Step length setting for lighting up gradually during
Bit4 Screen saver setting 0: No 1: Yes
Bit3 M option 0: No 1: Yes
Bit2 D/K option 0: No 1: Yes
Bit1 I option 0: No 1: Yes
Bit0 B/G option 0: No 1: Yes
Bit7 Arabic numeral 0: Yes 1: No
Bit6 DVD setting bit for AV board TC90L01 0: No 1: Yes
Bit5 Tilt correction setting bit 0: No 1: Yes
Bit4 “SVM”in PICTURE menu 0: No 1: Yes
Bit 3 TA1343/NICAM woofer output setting 0: Mono output 1: Overlapped to main channel
Bit 2 “WOOFER”in SOUND menu 0: No 1: Yes
Bit 1 Black-screen time setting 0: Short time 1: If OPT.2 = 1, long time; OPT.2 = 0, short
Bit.0 BBE AGC option 1: 300mv 0: 150mv
and use of AUTO button)
SECAM gate pulse width
power-on
00: B/G 01: I 10: D/K 11: M
00: 2.2μS 01: 2.0μS
10:1.8μS 11: SECAM decoding disabled
1：Large step 0: Small step
time
MODE3
BIT 7 Relay switch option 1: Yes 0: No
BIT 6 Instant power-on option 1: Yes 0: No
BIT 5.4 Fixed to 00
BIT 3 BBE/SRS IC 1: Yes 0: No
BIT 2
BIT 1
TA1218
Multi AV switch options
BIT 0 BIT 1 BIT2
0 0 0 TV - AV1(S) - AV2 - AV3(S) - DVD
0 0 1 TV - AV1(S) - AV2 - AV3(S)
0 1 0 TV - AV1(S) - AV2 - DVD
0 1 1 TV - AV1(S) - AV2
10
(continued)
SERVICE MANUAL
BIT 0
MODE4
LANG-OPT
When only with
single
language
option, reset
the CPU to
enable the
options.
BIT 7 TC90A49 option 0: No 1: Yes
BIT 6 TA1343 option 0: No 1: Yes
BIT 5 TC90L01 option 0: No 1: Yes
BIT 4 TA1218 option 0: No 1: Yes
BIT 3 NA
BIT 2 NJW1161 option 0: No 1: Yes
BIT 1 NJW1160 option 0: No 1: Yes
BIT 0 NJW1137 option 0: No 1: Yes
BIT 7 Arabic 0: No 1: Yes
BIT 6 Farsi 0: No 1: Yes
BIT 5 Malay 0: No 1: Yes
BIT 4 Indonesian 0: No 1: Yes
BIT 3 Russian 0: No 1: Yes
BIT 2 German 0: No 1: Yes
BIT 1 French 0: No 1: Yes
BIT 0 English 0: No 1: Yes
1 0 0 TV - AV1(S) - AV3(S) - DVD
1 0 1 TV - AV1(S) - AV3(S)
1 1 0 TV - AV1(S) - DVD
1 1 1 TV - AV1
LANG-OUT Ex-factory language options with AUTO key 00: English 01: French 02: German 03: Russian
04: Indonesian 05: Malay 06: Farsi 07: Arabic
OPT
OSD Horizontal position of OSD
RCUT R cut off
GCUT G cut off
BCUT B cut off
GDRV G drive
BDRV B drive
Bit 7 Interval between relay on and off 0: No 1: Yes
Bit 6 VCO adjustments 0: PIF VCO functions (PIFVCO = 10) during auto search and
search；
1: PIFVCO = 10 during turn-on，and PIFVCO = 00 in Normal
mode
Bit 5 Audio processing 1: Yes 0: No
Bit 4 Large-amplitude AFT switch when no signal 1: Off 0: On
Bit 3 Audio gain switch 1: Off 0: On
Bit 2 Usage of Y-mute 0: No 1: Yes
Bit 1 Thailand B/G (5.74M) 1: Yes 0: No
Bit 0 Single audio system 1: Yes 0: No
CNTX Contrast Max.
BRTC Brightness center
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(continued)
SERVICE MANUAL
COLC Color center (for NTSC)
TNTC Tint center (for NTSC)
TNTCAV Tint center (for NTSC IN AV)
COLP Color center (for PAL)
COLS Color center (for SECAM)
DCOL DVD color
SCOL Sub color center (for DVD)
SCNT Y- sub contrast
CNTC Contrast center
CNTN Contrast Min.
BRTX Brightness Max.
BRTN Brightness Min.
COLX Color Max.
COLN Color Min.
TNTX Tint Max.
TNTN Tint Min.
ST3 Sharpness center for NTSC 3.58 (TV)
SV3 Sharpness center for NTSC 3.58 (VIDEO)
ST4 Sharpness center for other color system (TV)
SV4 Sharpness center for other color system (VIDEO)
SVD Sub Sharpness center in DVD
ASSH Asymmetry sharpness
SHPX Sharpness Max.
SHPN Sharpness Min.
TXCX Text RGB in user contrast Max.
RGCN Text RGB in user contrast Min.
ABL
DCBS
CLTO
Chroma data
(TV & not M)
BIT 5 Y peak limiter 0: Off 1: On
BIT 4 OSD ABL 0: Active 1: Inactive
BIT 3.2 ABL start point
BIT 1.0 ABL gain
BIT 7 Blank SW 0: H, V blanking on 1: H, V blanking off
Bit 6
Bit 5.4 OSD level
Bit 3.2 Y gamma
Bi t 1.0 Black stretch
BIT 7 Killer off
BIT 6 P/N ID
BIT 5 C gamma 0: Color gamma off 1: On
00: ABL start point: 0V 01: -0.15V
10: -0.30V 11: -0.45V
00: -0.2V 01: -0.4V
10: -0.6V 11: -0.8V
00: OSD level, 80 IRE 01: 70IRE
10: 60IRE 11: 50IRE
00: Off 01: Y point 90 IRE, Gain –3dB
10: 80IRE 11: 70IRE
00: Off 01: Black stretch point, 25 IRE
10: 35IRE 11: 45IRE
0: Normal 1: Always killer off
0: PAL/ NTSC killer sensitivity, 1mVpp 1: 10mVpp
(continued)
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SERVICE MANUAL
CLTM
(TV & M)
CLVD(DVD)
CLVO(50hz)
/CLVM（60hz）
(VIDEO)
DEF BIT0 = 0: V AGC reference depends on YC VCC; BIT0 = 1: V AGC reference depends on integrated regulator
SECD No use
HPOS 50Hz horizontal phase
VP50 V phase (50Hz)
HIT V size
HPS Adjusting difference between horizontal centers in PAL and NTSC
VP60 V phase (60Hz)
HITS
VLIN V-linearity
VSC V-S correction
VLIS
VSS
DPC EW parabola
DPCS
HIT69
DPC69
HIT69S
DPC69S
KEY Trapezium
KEYS
WID H size
WIDS
ECCT EW corner top
ECCB EW corner bottom
VEHT V EHT gain
HEHT H EHT gain
SBY Use in SECAM
SRY Use in SECAM
BRTS
RFAGC RF AGC
BIT 4.3 NTSC matrix
BIT 2.1.0 Y DL
Adjusting difference between vertical amplitudes in PAL and NTSC
Adjusting difference between vertical linear in PAL and NTSC
Correction for shift data of 50 Hz/ 60 Hz
Shift data of EW parabola
Vertical amplitude in 16:9 mode (PAL)
EW parabola 16:9 in 16:9 mode (PAL)
Vertical amplitude in 16:9 mode (NTSC)
EW parabola 16:9 in 16:9 mode (NTSC)
Shift data of trapezium
Shift data of H size
Sub brightness (difference)
00: USA (105 degree) 01: Japan (93 degree)
10: DVD 11:
000: -40 nsec 001: 0 010: 40 nsec 011: 80 nsec
100: 120 nsec 101: 160 nsec 110: 200 nsec 111: 240 nsec
00: -3usec 10: 0 1F: +3usec
0: V phase delay, 0H 7: 7H
00: -50% 20: 0% 3F: 50%
0: V phase delay, 0H 7: 7H
0: -15% 8: 0% F: 15%
0: -16% 8: 0% F: 16%
00: 0Vpp 20: 1.4Vpp 3F: 2.8Vpp
00: -13% 20: 0% 3F: 13%
00: 1.5V V20: 4V 3F: 6.5V
00: -1.5V 10: 0V 1F: 1.5V
00: -1.5V 10: 0V 1F: 1.5V
0: 0% 4: 5% 7: 10%
0: 0% 4: 5% 7: 10%
00: IF mute 01: 65dBu 3F: 100dBu
(continued)
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SERVICE MANUAL
Data Description
BIT 3.2
HAFC
BIT 1.0
V01 Volume output data at 1%
V25 Volume output data at 25%
V50 Volume output data at 50%
V100 Volume output data at 100%
Woofer TA1343 woofer Max.
STAT No use
BIT 7 Readjust VCO when selecting position 0: Enable 1: Disable
FLG0
FLG1
REFP AKB pulse position
RSNS R SENSE 00: x 0 20: x 0.5 3F: x 1.0
BIT 2 N buzz cancel 0: Nyquist buzz cancel, on 1: Off
BIT 1 AFT window SW
BIT 0 Over modulation 0: Normal 1: PIF over modulation switch on
BIT 5 MIX GAIN 0: SIF 1MHz convert gain, low gain 1: High gain
BIT 4 Sync separation. 0: Sync separation level 40% 1: 36%
AFC gain
(in VIDEO mode)
AFC gain
(in TV mode)
0 0 3 1
0 1 4/7 2/7
1 0 4/3 1
1 1 Off Off
Data Description
0 0 3 1
0 1 4/7 2/7
1 0 4/3 1
1 1 Off Off
0: Wide (-/+ 250kHz) AFT sensitivity, for channel search
1: Narrow (83kHz) For normal operation
000: 0H 001: 1H 010: 2H 011: 3H
100: 4H 101: 5H 110: 6H 111: 7H
Blanking Period Picture Period
Blanking Period Picture Period
GSNS G SENSE 00: x 0 20: x 0.5 3F: x 1.0
BSNS B SENSE 00: x 0 20: x 0.5 3F: x 1.0
MOD
STBY
SVM BIT.4
SVM1 Data when SVM off
SVM3 Data when SVM on
VBLK
VCEN Vertical centering 00: -32% 20: 0% 3F: 30%
UCOM
Bit 6.5.4 PIF FREQUENCY 001: 45.75 MHz 011: 38.9 MHz 100: 38.0 MHz
Bit 1.0 AKB MODE
BIT 3.2 VCD STANDBY
BIT 1.0 IF Standby
BIT 3.2 V blanking stop point
BIT 1.0 V blanking start point
BIT 1.0 Internal ADC
BIT5.4.3
Improving NTSC color signal-to-noise
ratio
00: AKB off 01: ACB (cutoff: align to targets)
10: ADB (drive: align to targets) 11: AKB (cutoff/drive: align to targets)
00: Normal 01: Normal
10: Normal 11: VCD Standby
00: Normal 01: Normal
10: Normal 11: IF Standby
1:co max=1（-0.65 to +0.85） 0: co max=0（cutoff range:
-0.65 to +0.65)
00: 310H(50hz) 263H(60hz) 01: 299H(50hz) 254H(60hz)
10: 295H(50hz) 250H(60hz) 11: 291H(50hz) 246H(60hz)
00: 23H(50hz) 22H(60hz) 01: 33H (50hz)30H(60hz)
10: 37H (50hz)34H(60hz) 11: 41H(50hz) 38H(60hz)
00: GND 01: R output
10: B output 11: Monitor RF AGC via ADC
Available range: 000….011
(continued)
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SERVICE MANUAL
VTST No use
PYNX Normal H.SYNC Max. 0-----------3F
PYNN Normal H.SYNC Min. 0-----------3F
PYXS ASM/Search H.SYNC Max. 0-----------3F
PYNS ASM/Search H.SYNC Min 0-----------3F
BASC
BASX
TREC
BALC Balance volume Center
BAS1 Bass in MUSIC mode setting
TRE1 Treble in MUSIC mode setting
WFL1 Woofer in MUSIC mode setting
Bass volume Center
Bass volume Max.
Treble volume Center
BAS2
TRE2 Treble in NEWS mode setting
WFL2 Woofer in NEWS mode setting
BAS3 Bass in THEATRE mode setting
TRE3 Treble in THEATRE mode setting
WFL3 Woofer in THEATRE mode setting
WON1 TA1343 Max. woofer setting. The bigger the setting the smaller Max. woofer.
WON2
NVOL
NICL NICAM->MONO level
NICH MONO->NICAM level
NOIS
VATT
COM1
(TC90A49)
COM2
(TC90A49)
B1(12345)
B2(12345)
B3(12345)
BBE
OSDF OSD frequency setting
Bass in NEWS mode setting
Woofer linear setting
Prescale NICAM
BIT 2
BIT 7-BIT 0
Audio ATT 00:-85DB or less 7F:0DB (7 BITS)
BIT 3 Pedestal clip 0: On 1: Off
BIT 2.1.0 VENH2.1.0 000: 0db(x1) …… 111: 3.52db(x1.5)
BIT 7.6.5.4 Set vertical enhancer non-linear point 0000: 4LSB …… 1111: 64LSB
BIT 3 Set Y output horizontal peaking gain 0: 1.5dB 1: 3.0dB
BIT2 Set Y output horizontal peaking on/off 0: On 1: Off
BIT 1.0 Set vertical enhancer coring level 00: 0LSB …… 11: 3LSB
NICAM chip five-equalizer data when the sound mode set to MUSIC:
B11 (for 120Hz) B12 (for 500 Hz) B13 (for 1.5KHz) B14 (for 5KHz) B15 (for 10KHz)
NICAM chip five-equalizer data when the sound mode set to NEWS:
B21 (for 120Hz) B22 (for 500 Hz) B23 (for 1.5KHz) B24 (for 5KHz) B25 (for 10KHz)
NICAM chip five-equalizer data when the sound mode set to THEATRE:
B31(for 120Hz) B32 (for 500 Hz) B33 (for 1.5KHz) B34 (for 5KHz) B35 (for 10KHz)
Highest four bits：BBE contour (0dB to 15dB); Lowest four bits: BBE process (0dB to 15dB)
AFC gain data setting in TV mode: 1: Adjust AFC gain in the lowest two bits of HAFC 0: With weak signal
received, AFC gain = 0x10; with strong signal received, AFC gain = 0x00
Criterion of signal strength: >NOIS: Weak signal
<= NOIS: Strong signal
15
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