Akai LCT2016 User manual

LCT2016
Safety Instructions ........................................................................1-2
Production specification...............................................................3-5
Block Diagram................................................................................ 6-6
Circuit Diagram..............................................................................7-24
Main IC Specification...................................................................25-25
Mechanical Dimensions...............................................................26-26
Disassembly.............................................................................27-28
Spare parts list............................................................................29-29
V-chip password and software upgrade .....................................30-32
Model:
SERVICE MANUAL
This manual is the latest at the time of printing, and does not
include the modification which may be made after the printing,
by the constant improvement of product.

-2-
I. SafetyInstructions
PRECAUTIONSDURINGSERVICING
1. Inaddition tosafety,otherpartsand assembliesare
specified forconformancewithsuchregulationsas
thoseapplying tospuriousradiation.Thesemust
alsobe replaced onlywithspecified replacements.
Examples:RFconverters,tunerunits,antenna
selection switches,RFcables,noise-blocking
capacitors,noise-blocking filters,etc.
2.Usespecified internalWiring.Noteespecially:
1)Wirescovered withPVCtubing
2)Doubleinsulated wires
3)High voltage leads
3.Usespecified insulating materialsforhazardous
liveparts.Noteespecially:
1)Insulating Tape
2)PVCtubing
3)Spacers(insulating barriers)
4)Insulating sheetsfortransistors
5)Plasticscrewsforfixing microswitches
4.When replacing ACprimaryside components
(transformers,powercords,noiseblocking
capacitors,etc.),wrap endsofwiressecurelyabout
the terminalsbeforesoldering.
5.Makesurethatwiresdo notcontactheatgenerating
parts(heatsinks,oxide metalfilmresistors,fusible
resistors,etc.)
6.Check ifreplaced wiresdo notcontactsharplyedged
orpointed parts.
7.Makesurethatforeign objects(screws,solder
droplets,etc.)do notremaininside the set.
MAKEYOUR CONTRIBUTIONTOPROTECTTHE
ENVIRONMENT
Used batterieswiththe ISOsymbol
forrecycling aswell assmall
accumulators(rechargeablebatteries),mini-batteries
(cells)and starterbatteriesshouldnotbe thrown
intothe garbage can.
Pleaseleavethematan appropriatedepot.
WARNING:
Beforeservicing thisTVreceiver,read the X-RAY
RADIATIONPRECAUTION,SAFETYINSTRUCTION
and PRODUCTSAFETYNOTICE.
X-RAYRADIATIONPRECAUTION
1.Excessivelyhigh can producepotentiallyhazardous
X-RAY RADIATION.Toavoidsuchhazards,the high
voltage mustnotexceed the specified limit. The
normalvalue ofthe high voltage ofthisTVreceiver
is27 KV atzerobean current(minimumbrightness).
The high voltage mustnotexceed 30 KV underany
circumstances.Eachtimewhen areceiverrequires
servicing,the high voltage shouldbe checked.The
reading ofthe high voltage isrecommended tobe
recorded asapartofthe servicerecord,It is
importanttousean accurateand reliablehigh
voltage meter.
2.The onlysourceofX-RAY RADIATIONinthisTV
receiveristhe picturetube.Forcontinued X-RAY
RADIATIONprotection,the replacementtube mustbe
exactlythe sametype asspecified inthe partslist.
3.SomepartsinthisTVreceiverhavespecialsafety
related characteristics forX-RADIATIONprotection.
Forcontinued safety,the partsreplacementshould
be undertaken onlyafterreferring the PRODUCT
SAFETYNOTICE.
SAFETYINSTRUCTION
The serviceshouldnotbe attempted byanyone
unfamiliarwiththe necessaryinstructionson thisTV
receiver.The following arethe necessaryinstructions
tobe observed beforeservicing.
1.Anisolation transformershouldbe connected inthe
powerline between the receiverand the ACline
when aserviceisperformed on the primaryofthe
convertertransformerofthe set.
2.Complywithall caution and safetyrelated provided
on the back ofthe cabinet, inside the cabinet, on the
chassisorpicturetube.
3.Toavoidashock hazard,always discharge the
picturetube'sanode tothe chassisground before
removing the anode cap.
The lightning flashwitharrowhead symbol,
withinan equilateraltriangle,isintended toalert
the usertothe presenceofuninsulated “dangerous
voltage”withinthe product’ s enclosurethatmay
be ofsufficientmagnitude toconstitutearisk of
electricshock topersons.
The exclamation pointwithinan equilateral
triangleisintended toalertthe usertothe
presenceofimportantoperating and maintenance
(servicing)instructionsinthe literature
accompanying the appliance.
CAUTION:TOREDUCETHERISKOFELECTRIC
SHOCK,DONOTREMOVECOVER(ORBACK).NO
USER-SERVICEABLEPARTSINSIDE.REFER
SERVICINGTOQUALIFIEDSERVICEPERSONNEL
ONLY.
CAUTION
RISKOFELECTRICSHOCK
DONOTOPEN
1

-3-
PRODUCTSAFETYNOTICE
Manyelectricaland mechanicalpartsinthisTV
receiverhavespecialsafety-related characteristics.
Thesecharacteristics areofferpassed unnoticed by
visualspection and the protection afforded bythem
cannotnecessarilybe obtained byusing replacement
componentsratesforahighervoltage,wattage,etc.
The replacementpartswhichhavethesespecial
safetycharacteristics areidentified bymarks on
the schematicdiagramand on the partslist.
Beforereplacing anyofthesecomponents,read the
partslistinthismanualcarefully.The useof
substitutereplacementpartswhichdo nothavethe
samesafetycharacteristics asspecified inthe parts
listmaycreateshock,fire,X-RAY RADIATIONor
otherhazards.
Good earthground
suchasthe water
pipe,conductor,
etc.
Placethisprobe
on eachex-
posed metallic
part
ACVOLTMETER
ACLeakage CurrentCheck
4.Completelydischarge the high potentialvoltage ofthe
picturetube beforehandling.The picturetube isa
vacuumand ifbroken,the glass will explode.
5.When replacing aMAINPCBinthe cabinet, always
be certainthatall protectiveareinstalled properly
suchascontrolknobs,adjustmentcoversorshields,
barriers,isolation resistornetworks etc.
6.When servicing isrequired,observethe originallead
dressing.Extraprecaution shouldbe given toassure
correctlead dressing inthe high voltage area.
7.Keep wiresawayfromhigh voltage orhigh tempera
turecomponents.
8.Beforereturning the settothe customer,always
perform an ACleakage currentcheck on the exposed
metallicpartsofthe cabinet, suchasantennas,
terminals,screwheads,metaloverlay,controlshafts,
etc., tobe surethe setissafetooperatewithout
dangerofelectricalshock.Plug the ACline cord
directlytothe ACoutlet(do notusealine isolation
transformerduring thischeck).Usean ACvoltmeter
having 5Kohmsvoltsensitivityormoreinthe
following manner.
Connecta1.5Kohm10 watt resistorparalleled bya
0.15µFACtype capacitor,between agood earth
ground (waterpipe,conductoretc.,)and the exposed
metallicparts,one atatime.
Measurethe ACvoltage across the combination of
the 1.5Kohmresistorand 0.15 uFcapacitor.Reverse
the ACplug atthe ACoutletand repeatthe AC
voltage measurementsforeachexposed metallic
part.
The measured voltage mustnotexceed 0.3VRMS.
Thiscorrespondsto0.5mAAC.Anyvalue exceeding
thislimitconstitutesapotentialshock hazardand
mustbe corrected immediately.
The resistancemeasurementshouldbe done
between accessibleexposed metalpartsand power
cordplug prongswiththe powerswitch"ON".The
resistanceshouldbe morethan 6Mohms.
2

Technical Specification
Product Model: LCT2016
Screen Size: 20” diagonal
Screen Area: 408mm(H) x 306mm(V)
Aspect Ratio: 4:3
External Size: 680mm(W) x 480mm(H) x 70mm(D) (w/o Stand)
Net Weight: 10kg
Resolution: 640 (H) x 480 (V) pixels (Each pixel has R/G/B 3 color
cells)
Color: 16.7 millions of colors (R/G/B each 256 scales)
Gray Scale: 256 (R/G/B each 8-bit)
Brightness(Peak Value): 450cd/m2 (Typical)
Contrast(Dark Room): 500:1 (Typical)
TV System: NTSC M
Power Supply: AC 100-240V, 50/60 Hz
Power Consumption: ≤ 60W
Input Terminals: PC VGA 15 Pin (Analog RGB Input)
Component Video - YPbPr/YCbCr x 1 RCA Terminals
Video Input RCA Terminals
S-Video Input Mini Din 4 Pin Terminal
Audio Input for Video/S-Video
Audio Input for YPbPr/YCbCr x 1
Audio Input for PC (3.5mm)
Agent System: UL, cUL, FCC
3

Support the Signal Mode
A. D-Sub Mode (VGA)
B. HDTV Mode (YPbPr)
- When the signal received by the Display exceeds the allowed range, a warning message
“INPUT NOT SUPPORTED” shall appear on the screen.
- You can confirm the input signal format from the on-screen.
NO. Resolution
Horizontal
Frequency
(KHz)
Vertical
Frequency
(Hz)
Dot Clock
Frequency
(MHz)
1 640 x 480 31.50 60.00 25.18
2 640 x 480 35.00 67.00 30.24
3 640 x 480 37.50 75.00 31.50
4 640 x 480 37.86 72.81 31.50
5 720 x 400 31.47 70.08 28.32
6 800 x 600 35.16 56.25 36.00
7 800 x 600 37.90 60.32 40.00
8 800 x 600 46.90 75.00 49.50
9 800 x 600 48.08 72.19 50.00
10 832 x 624 49.00 75.00 57.27
11 1024 x 768 48.40 60.00 65.00
12 1024 x 768 56.50 70.00 75.00
13 1024 x 768 60.00 75.00 78.75
14 1152 x 864 63.86 70.02 94.51
15 1152 x 864 67.52 75.02 108.03
16 1280 x 960 60.02 60.02 108.04
17 1280 x 1024 64.00 60.01 108.00
NO. Resolution
Horizontal
Frequency
(KHz)
Vertical
Frequency
(Hz)
Dot Clock
Frequency
(MHz)
1 480i 15.734 59.94 13.50
2 480p(720x480) 31.468 59.94 27.00
3 720p(1280x720) 45.00 60.00 74.25
4 1080i(1920x1080) 33.75 60.00 74.25
4