RCA MCR51R410 User manual

VCR
Basic Service Data
Latin America After Sales
Indianapolis, IN 46290 U.S.A.
SAFETY NOTICE
USE ISOLATION TRANSFORMER WHEN SERVICING
Components having special safety characteristics are identified by a ( ) on schematics and on parts list in this Service Data and its bulletins. Before
servicing this instrument, it is important that the service technician read and follow the “Safety Precautions” in the Basic Service Data.
First Edition –First Printing
Copyright 2003 –Thomson inc
Printed in U.S.A. –Trademark(s)Registered –Marca(s) Registrada (s)
CN
-
12C5
CN
-
12C5
CN
-
12C5
Nov / 03
Models Included: MCR51R410
MCR51R420
MCR53TF30
Contents Page
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Chassis Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Circuit Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
IC Pin Out and Functional Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
IC Voltage / Resistance Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Replacement Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Appendix
Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Appendix
Circuit Board Component Views. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Appendix
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SERVICE MANUAL
SPECIFICATIONS
Model Number MCR51R410 MCR51R420 MCR53TF30
Color
system PAL4.43, NTSC3.58, NTSC4.43
RF system Sound
system D/K,I,M,B/G
Video system PAL4.43, NTSC3.58, NTSC4.43 (50/60Hz)
VHF C1- C12
UHF C13-C57
Receiving
channel CATV Z1-Z37
Channels preset 236
Picture tube Effective
screen dimensions
(Approx.)
280 210mm 406 305mm
Audio output
(THD 7%) 2W
Power source 220-240V AC, 50Hz
Weight (Approx.) 11.5kg 23.5kg 28kg
Dimensions
(W HD) (Approx.)
375 356
370mm 600 468 486mm 605 480 489mm
Rated power
consumption
220V AC 50Hz
80W 69W 100W
Designs and specifications are subject to change without notice.
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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 identical to the original fitted as specified in the parts list.
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.
SAFETY PRECAUTION
WARNING: REFER SERVICING TO QUALIFIED SERVICE PERSONNEL ONLY.
1. The TV has a nominal working EHT voltage of 28kV. 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).
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SERVICE MANUAL
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.
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 OPERATING 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.
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SERVICE MANUAL
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 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 This symbol tells you that the critical components identified by the VDE marking have
special safety-related characteristics.
MAINTENANCE
1. Place the TV set on a stable stand or base that is of adequate size and strength to prevent it 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.
2. Do not install the TV set in a place exposed to rain, water, excessive dust, mechanical vibrations or
impacts.
3. Allow enough space (at least 10cm) between the TV and wall or enclosures for proper ventilation.
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 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.
6. Unplug the TV set from the wall outlet before cleaning or polishing it. Use a dry soft cloth for
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:
The purity/convergence magnet assembly and rubber wedges need mechanical positioning.
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.
1.10Tighten 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.
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SERVICE MANUAL
Yoke
Fig. 1
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.
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 3) 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
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SERVICE MANUAL
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.
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
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 I2C bus control, change the bus
data to adjust white balance.
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 with
I2C 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
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SERVICE MANUAL
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. Supply Voltage Adjustment
Caution: +B voltage has close relation to high voltage. To prevent X-ray radiation, set +B
voltage to the rated voltage.
2.1 Make sure that the supply voltage is within the range of the rated value.
2.2 Connect a digital voltmeter to the +B voltage output terminal of the TV set. Power on the TV and
set the brightness and sub-brightness to minimum.
2.3 Regulate voltage adjustment components on the power PCB to make the voltmeter read 130±1V.
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
picture tube.
3.2 Plug in the supply socket (220V, AC) and turn on the TV. Set the brightness and contrast to
minimum (0 A).
3.3 The high voltage reading should be less than the EHT limitation.
3.4 Change the brightness from minimum to maximum, and ensure high voltage not beyond the
limitation in any case.
Nominal EHT voltage:For MCR51R410,MCR51R420,MCR53TF30 is 28 1.5KV: Limited EHT
voltage: For MCR51R410,MCR51R420,MCR53TF30 is 30.5KV.
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.
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SERVICE MANUAL
BeforeAdjusting AfterAdjusting
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 20M .
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, press the
POWER button to quit the S mode.
S
AFW:240Khz 1
( S is red and other items are yellow.)
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.
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SERVICE MANUAL
6.2 Adjustments and Bus data
Item Symbol Description Bus Data Remarks
MENU.00
V.POS /50H VERTICAL POSITION/50Hz 40
H.PHASE/50H HORIZONTAL PHASE/50Hz 11
V.SIZE/50H VERTICAL SIZE/50Hz 80
V.POS /60H VERTICAL POSITION/60Hz 40
H.PH/60H HORIZONTAL PHASE/60Hz 15
V.SIZE/60H VERTICAL SIZE/60Hz 60
V.SC VERTICAL S-CORRECTION 18
V,LINE VERTICAL LINE 19
V.SIZE CMP VERTICAL SIZE COMPENSATION 7
MENU.01
SUB.BIAS SUB-BRIGHT 63
SUB.CONT SUB-CONTRAST 63
V.KILL VERTICAL KILL 0
RF.AGC RF AGC 20
R.BIAS RED BIAS 130
G.BIAS GREEN BIAS 130
B.BIAS BLUE BIAS 130
R.DRIVE RED DRIVE 75
G.DRIVE GREEN DRIVE 15
B.DRIVE BLUE DRIVE 75
MENU.02
SECAM B DC SECAM B-Y 9
SECAM R DC SECAM R-Y 9
S/DVD B.DC S/DVD B-Y 6
S/DVD R.DC S/DVD R-Y 6
SYNC.KIL SYNC KILL 0
H.BLK.L HORIZONTAL BLANKING LEFT 4
H.BLK.R HORIZONTAL BLANKING RIGHT 4
CROS.B/W CROSSHATCH BLACK/WHITE 0
VIDEO.LVL VIDEO LEVEL 7
FM.LEVEL FM LEVEL 22
MENU.03
FM.MUTE FM MUTE 0
AUDIO.MUTE AUDIO MUIE 0
VIDEO.MUTE VIDEO MUTE 0
DEEM.TC DE-EMPHASIS TIME CONSTANT 0
SND.TRAP SOUND TRAP 0
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SERVICE MANUAL
MENU.04
SUB.COLOR SUB COLOR 63
SUB.TINT SUB TINT 32
SUB.SHARP SUB SHARP 63
AUTO FLESH AUTOMATIC FLESH 0
CORING.GAN CORING GAIN 1
C.EXT EXTERNAL CHROMA 0
C.BYPASS CHROMA BAND-PASS BYPASS 0
C.KILL ON COLOR KILL ON 0
MENU.05
FIL.SYS FILTER SYSTEM SELECT Y/C FILTER MODE 1
COLOR.SYS COLOR SYSTEM 5
VOL.FIL VOLUME FILTER 0
VIF.SYS VIF SYSTEM 2
SIF.SYS.SW SIF SYSTEM SWITCH 0
* VIDEO.SW VIDEO SWITCH 1
MENU.06
R/B G.BAL R-Y/B-Y GAIN BALANCE 15
R/B ANGLE R-Y/B-Y ANGLE 15
CD. MODE VERTICAL COUNTDOWN MODE 0
GREY MODE GREY MODE
V.SETUP VERTICAL SETUP 0
MENU.07
BLANK.DEF BLANK.DEFEAT 0
BRT.ABL.TH BRIGHT ABL THRESHOLD 1
RGB TEMP RGB TEMPERATURE CHARACTERISTICS 1
BRT.ABL.DF BRIGHT ABL DEFEAT 1
MID.STP.DF BRIGHT MID STOP DEFEAT 1
FBP.BLK.SW FBP.BLANKING OR.SWITCH 0
MENU.08
DIGITAL.OSD DIGITAL OSD MODE 0
OSD.CONT OSD CONTRAST CONTROL? 40
OSD.CONTST OSD CONTRAST CONTROL? 0
OSD. H.POS OSD HORIZONTAL POSITION 22
MENU.09
H.FREQ HORIZONTAL FREQUENCY 46
FM.GAIN FM GAIN 0
C.KILL.OFF COLOR KILL OFF 0
AUDEO.SW AUDEO SWITCH 0
T.DISBLE TEST MODE SWITCH DISABLE 1
MENU.10
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SERVICE MANUAL
G/Y ANGLE G-Y ANGLE 0
COL KIL OP COLOR KILLER OPERATIONAL POINT 5
CBCR-IN YCbCr INPUT or SECAM INPUT 1
Y-APF YCbCr ALL PASS FILTER SELECT 0
PRE SHOOT PRE-SHOOT SELECT 0
WPL OPE WHITE PEAK LIMITER OPERATING POINT 0
DC REST DC RESTORATION SELECT 0
BK STR STA BLACK STRETCH START 3
BK STR GAN BLACK STRETCH GAIN 2
MENU.11
OVER MD SW OVER MD SW? 0
Y GAMMA Y GAMMA 0
FSC C.SYNC FSC C.SYNC? 1
VBLK SW V BLANKING CONTROL SW 0
SND TRAP SOUND TRAP CONTROL 1
HALF TONE HALF TONE LEVEL 3
HALF T SW HALF TONE ON/OFF SW 1
TST VRESET TST VRESET? 0
MENU.12
E/W DC E/W DC 32
E/W AMP E/W AMP 32
E/W TILP E/W TILP 32
E/W C TOP E/W C TOP 5
E/W C BOTM E/W C BOTM 5
MENU.13 MENU.13
E/W TEST E/W TEST 7
HSIZE COMP HORIZONTAL SIZE COMPENSATION 7
IF TEST 3B IF TEST 3B 0
V.LEV ADJ VIDEO.LEVEL ADJUSTMENT 0
OV MOD LEV OV MOD LEV 5
PRE/OVER PRE/OVER SHOOT 0
C.VCO SW CHROMA.VCO SWITCH 0
C.VCO ADJ CHROMA VCO ADJUSTMENT 3
MENU.14 MENU.14
VNSYNC VNSYNC 0
TINT.THROU TINT.THROU 0
HLOCK.VDET HLOCK.VDET 1
MENU.15 MENU.15
OPT.1CHIP OPT.1CHIP 0
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SERVICE MANUAL
OPT.VIDEO OPT.VIDEO 1
OPT.AV1AV2 OPT.AV1AV2 1 0 for
MCR51R410
OPT.AV3 OPT.AV3 0
OPT.S-VHS OPT.S-VHS 0
OPT.YUV OPT.YUV 0
OPT.COMB OPT.COMB 0
OPT.BYPASS OPT.BYPASS 0
MENU.16 MENU.16
OPT.VM OPT.VM 0
OPT.BLUEBK OPT.BLUEBK 1
OPT.V-CHIP OPT.V-CHIP 1
OPT.CCD OPT.CCD 1
OPT.CLOCK OPT.CLOCK 1
OPT.P-ON OPT.P-ON 0
X-RAY VOLT X-RAY VOLTAGE 40
SRCH.SPEED SEARCH.SPEED 0
ROM
CORREC ROM CORRECTION 0
MENU.17 MENU.17
OPT.BTSC OPT.BTSC 0
OPT.AV-INP OPT.AV-INPUT 0
OPT.BBE OPT.BBE 0
SUB.BASS SUB.BASS 3
SUB.TREBLE SUB.TREBLE 3
OPT.COLOR OPT.COLOR 0
OPT.LNG1 OPT.LNG1 0
OPT.LNG2 OPT.LNG2 0
OPT.LNG3 OPT.LNG3 0
MENU.18 MENU.18
LOUDNESS LOUDNESS 9
FM/AM.PRES FM/AM.PRESET 63
SCART.PRES SCART.PRESET 27
SCART.VOL SCART.VOL 117
OPT.AVC OPT.AVC 1
AVC.DECAY AVC.DECAY 2
Notes:
The data sheet may differ dependent on different models.
The data sheet may differ dependent on different CRTs for the same model.
The items marked with “*” are adjustments used for manufacturing.
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14
STRUCTURE AND CHASSIS FUNCTION DESCRIPTION
1 Structure Block Diagram

15
2 Block Diagram for Supply Voltage System

16
3 System Control Block Diagram

SERVICE MANUAL
4 Chassis Description
MCR51R410/420/MCR53TF30 These TV uses CN-12C5 chassis which mainly includes a small signal
processor LA76818A microcontroller LC863440/CH04T1232 vertical scan output stage circuit
LA7840 and sound power amplifier TDA7057AQ. The switch power circuit is formed of hybrid IC
STR-G5653. TV/VIDEO and AV input/output are controlled by HEF4053BP and KA2192BV. LA76818A,
a small signal processing chip developed by Japan-based Sanyo, is designed for use in
PAL/NTSC/SECAM televisions, featuring high-integrity, performance & reliability and advanced
functions. With DVD component input, LA76818A improves its performance greatly based on LA76810.
Microcontroller LC863440, also developed by Japan-based Sanyo, is an I2C bus control 8-bit CMOS
single-chip microprocessor. It consists of 48K 8 ROM bit 640 8 RAM bit OSD controller on chip
(36 characters 16lines), remote control signal sensor, PWM output (7bit 3ch), I2C bus serial
interface, featuring high performance and wide usage.
The chassis has features of multi system reception and audio/video input/output.
The CN-12C5 chassis series mainly use the following ICs and assemblies.
Table Key ICs and Assemblies
Serial
No. Position Type Function Description
1 N101 LA76818A Small signal processor
2 D701 LC86F3448A/
CH04T1232 Microcontroller
3 D702 AT24C04/ST24C04 EEPROM
4 N301 LA7840/L Vertical scan output stage circuit
5 N191 TDA7057AQ Sound power amplifier
6 NV01 KA2102B/KA2192B TV/Video switch circuit
7 NK01 HEF4053BP Analog switch circuit
8 N510 STR-G5653 Power supply circuit
9 U101 TDQ-3B8/136 Tuner
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SERVICE MANUAL
SERVICE DATA
1 Technical Data of Key ICs
1.1 Small signal processor LA76818A
a. Block Diagram
Fig.7
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SERVICE MANUAL
Pin Function Pin Function
1 Audio Output 54 SIF Input
2 FM Output/Selected Audio Output 53 SIF APC Filter
3 PIF AGC 52 SIF Output
4 RF AGC Output 51 Ext. Audio Input
5 PIF Input1 50 APC Filter
6 PIF Input2 49 VCO Coil 1
7 IF Ground 48 VCO Coil 2
8 IF Vcc 47 VCO Filter
9 FM Filter 46 Video Output
10 AFT Output 45 Black Level Detector
11 Bus Data 44 Internal Video Input (S-C IN)
12 Bus Clock 43 Video/Vertical Vcc
13 ABL 42 External Video Input (Y In)
14 Red Input 41 Video/Vertical Bus Ground
15 Green Input 40 Selected Video Output
16 Blue Input 39 Chroma APC1 Filter
17 Fast Blanking Input 38 4.43MHz Crystal
18 RGB Vcc 37 Clamp Filter
19 Red Output 36 Chroma APC2 Filter
20 Green Output 35 SECAM R-Y Input (Cr input)
21 Blue Output 34 SECAM B-Y input (Cr input)
22 Fsc output/C-Sync output 33 CCD/Horizontal Ground
23 Vertical Output 32 CCD Filter
24 Ramp ALC Filter 31 CCD Vcc
25 Horizontal/Bus Vcc 30 Clock (4MHz) Output
26 Horizontal/AFC Filter 29 VCO IREF
27 Horizontal Output 28 Flyback Pulse Input
b. LA76818A Pin Assignment
19