Panasonic Omnivision PV-C2540-K User manual

ORDERNO. MKE0002102C1
B6
Combination VCR
PVQ-2510 / PV-C2540 / PV-C2540-K/ PV-C2580 / PV-C2580-K
SPECIFICATIONS
1

1. SAFETYPRECAUTIONS
GENERALGUIDELINES
1. IMPORTANTSAFETYNOTICE
Therearespecial components usedinthisequipmentwhichare
importantforsafety. These parts aremarkedby intheSchematic
Diagrams, CircuitBoardLayout, ExplodedViewsand Replacement
Parts List. Itisessential that these critical parts shouldbe
replacedwithmanufacturer'sspecifiedparts topreventX-
RADIATION, shock, fire, orotherhazards. Donotmodifythe
original design withoutpermission ofmanufacturer.
2. AnIsolation Transformershouldalwaysbeusedduring the
servicing ofCombination VCR whose chassisisnotisolatedfrom
theACpowerline. Use atransformerofadequate powerrating as
thisprotects thetechnicianfromaccidents resulting inpersonal
injuryfromelectrical shocks. Itwill alsoprotect Combination VCR
frombeing damagedbyaccidental shorting that mayoccurduring
servicing.
3. Whenservicing, observetheoriginal leaddress, especiallythe
leaddress inthehigh voltagecircuits. Ifashortcircuitisfound,
replace all parts whichhavebeenoverheatedordamagedbythe
shortcircuit.
4. Afterservicing, see toitthat all theprotectivedevices suchas
insulation barriers, insulation papers, shield, and isolation R-C
combinationsareproperlyinstalled.
5. Beforeturning thereceiveron, measuretheresistance betweenB+
lineand chassisground. Connect (-) sideofanohmmetertotheB
+lines, and (+)sidetochassisground. Eachlineshouldhavemore
resistance thanspecified, as follows:
B+ Line
MinimumResistance
125 V
1k (Coldchassisground)
27 V
180 (Coldchassisground)
2

17 V
110 (Coldchassisground)
6. WhentheTVset isnotusedforalong period oftime, unplug the
powercordfromtheACoutlet.
7. Potentials, as high as 32.0kVarepresentwhenthisTVset isin
operation. Operation oftheTVset withouttherearcoverinvolves
thedangerofashock hazardfromtheTVset powersupply.
Servicing shouldnotbeattemptedbyanyonewho isnot
thoroughlyfamiliarwiththeprecautionsnecessarywhenworking
on high voltageequipment. Alwaysdischargetheanodeofthe
picturetubetotheCRTground ofreceiverbeforehandling the
tube.
8. Afterservicing make thefollowing leakagecurrentchecks to
preventthecustomerfrombeing exposedtoshock hazards.
LEAKAGE CURRENTCOLDCHECK
1. Unplug theACcordand connect ajumperbetweenthetwoprongs
on theplug.
2. Forphysicallyoperatedpowerswitches, turnpoweron. Otherwise
skipstep2.
3. Measuretheresistance value, withanohmmeter, betweenthe
jumperedACplug and eachexposedmetalliccabinet parton the
receiver, suchas screwheads, connectors, etc. Whentheexposed
metallicparthasa returnpathtothechassis, thereading should
bebetween1M and 12 M . Whentheexposedmetal does not
haveareturnpathtothechassis, thereading must beinfinity.
LEAKAGE CURRENTHOTCHECK
1. Plug theACcorddirectlyintotheACoutlet.
Donotuse aisolation transformerforthischeck.
2. Connect a1.5k , 10 Wresistor, inparallel witha0.15 F
capacitor, betweeneachexposedmetallicparton theset and a
good earthground , as showninFigure1.
3. Use anACvoltmeter, with1k /Vormoresensitivity, tomeasure
thepotential across theresistor.
3

4. Check eachexposedmetallicpart, and measurethevoltageat
eachpoint.
5. Reverse theACplug intheACoutlet and repeat eachoftheabove
measurements.
6. Thepotential at anypointshouldnotexceed0.75 VRMS.
Aleakagecurrenttester(Simpson Model 229 equivalent) maybe
usedtomake thehotchecks. Leakagecurrentmust notexceed1/2
mA. Incase ameasurementisoutsideofthelimits specified, there
isapossibilityofshock hazard,and thereceivershouldbe
repairedand recheckedbeforeitisreturnedtothecustomer.
Figure1
2. X-RADIATION
WARNING:
1. Thepotential source ofX-Radiation inTVsets istheHigh Voltage
section and thepicturetube.
2. Whenusing apicturetubetest fixtureforservice, ensurethat the
fixtureiscapableofhandling 32.0kVwithoutcausing X-Radiation.
NOTE :
Itisimportanttouse anaccurate periodicallycalibratedhigh
voltagemeter.
1. Reduce thebrightness tominimum.
2. Set theSERVICEswitchtoSERVICE.
3. MeasuretheHigh Voltage. Themeterreading shouldindicate 30.0
kV±2.0kV.
Ifthemeterindication isoutoftolerance, immediate service and
correction isrequiredtopreventthepossibilityofpremature
componentfailure.
4

4. To preventanX-Radiation possibly, itisessential touse the
specifiedpicturetube.
HORIZONTALOSCILLATORDISABLE CIRCUITTESTSERVICE WARNING:
Thetestmustbemadeas afinal check beforesetisreturnedtothecustomer.
CONFIRMATIONOFX-RAYMOVEMENT
1. Turnoff TVset.
2. Connect thecircuitbelow betweenTP1209 and TP1208.
Figure2
3. Turnon DC Power, and thenturnon theset. Confirm that the
pictureison thescreenproperly.
4. Confirm that thepicturegoes outofhorizontal syncwhilegetting
downthevoltagetoDC Power.
5. Ifthisdoes notoccurevenwhengetting downthevoltageofDC
Powerto0V, itmeansthat X-rayprotect circuitisnotoperating.
Furtherconfirmation and repairisrequired.
REPAIRPROCEDURES OFHORIZONTALOSCILLATORDISABLE CIRCUIT
1. Connect aDC voltmeterbetweencapacitorC513 (+)on theMain
circuitboardand chassisground.
2. Ifapproximately+23.5Visnotpresentat that pointwhen120 VAC
isapplied, find thecause. Check R503, R5505, C5507, C513 and
D503.
3. Carefullycheck abovespecifiedparts and relatedcircuits and
parts. Whenthecircuitisrepaired, trythehorizontal oscillator
disablecircuittest again.
CIRCUITEXPLANATION
HORIZONTALOSCILLATORDISABLE CIRCUIT
Thepositive DC voltage, suppliedfrom theD503 cathodefor monitoring high voltage, isapplied
totheIC5301 Pin11 through R503 and R5504. Undernormal conditions, thevoltageatIC5301 Pin
11 isless thanapprox6V. IfthehighvoltageatFlyback TrPin5exceedsthespecifiedvoltage,
thepositive DC voltagewhichissuppliedfrom theD503 cathodealsoincreases. Theincreased
voltageisappliedtoIC5301 Pin11 through R503 and R5504. Duetotheincreasedvoltageat
IC5301Pin11, thehorizontal oscillator frequency increases, thepicturegoes outofhorizontal
sync, thebeam currentdecreases and thepicturebecomes darkinordertokeepX-radiation
underspecification.
5

Figure3
3. PREVENTIONOFELECTROSTATICDISCHARGE
(ESD) TO ELECTROSTATICALLYSENSITIVE (ES)
DEVICES
Somesemiconductor (solidstate)devices canbedamagedeasilybystaticelectricity. Such
componentscommonlyarecalledElectrostaticallySensitive (ES)Devices. Examples oftypical
ES devices areintegratedcircuitsand somefield-effecttransistorsaresemiconductor "chip"
components. Thefollowing techniques shouldbeusedtohelpreduce theincidence of
componentdamagecausedbyelectrostaticdischarge(ESD).
1. Immediatelybeforehandling anysemiconductorcomponentor
semiconductor-equippedassembly, drainoff anyESDon your
bodytouching aknownearthground. Alternatively, obtainand
wearacommerciallyavailabledischarging ESDwrist strap, which
shouldberemovedforpotential shock reasonspriortoapplying
powertotheunitundertest.
2. Afterremoving anelectrical assemblyequippedwithES devices,
place theassemblyon aconductivesurface suchas aluminum
foil, topreventelectrostaticchargebuildup orexposureofthe
assembly.
3. Use onlyagrounded-tipsoldering iron tosolderorunsolderES
devices.
4. Use onlyanantistaticsolderremoval device. Somesolderremoval
devices notclassifiedas "antistatic(ESDprotected)"cangenerate
electrical chargesufficienttodamageES devices.
5. Donotuse freon-propelledchemicals. These cangenerate
electrical charges sufficienttodamageES devices.
6. DonotremoveareplacementES device fromits protective
packageuntil immediatelybeforeyou arereadytoinstall it. (Most
replacementES devices arepackagedwithleadselectrically
shortedtogetherbyconductivefoam, aluminumfoil orcomparable
conductivematerial).
6

7. Immediatelybeforeremoving theprotectivematerial fromthe
leadsofareplacementES device, touchtheprotectivematerial to
thechassisorcircuitassemblyintowhichthedevice will be
installed.
CAUTION:
Besureno powerisappliedtothechassisorcircuit, and observe
all othersafetyprecautions.
8. Minimizebodilymotionswhenhandling unpackagedreplacement
ES devices. (Otherwise harmless motion suchas thebrushing
togetherofyourclothes fabricorthelifting ofyourfootfroma
carpetedfloorcangenerate staticelectricity(ESD)sufficientto
damageanES device).
"NOTE toCATV system installer:
Thisreminderisprovidedtocall theCATV system installer's attention toArticle820-40 ofthe
NECthatprovides guidelines for propergrounding and, inparticular, specifies thatthecable
ground shall beconnectedtothegrounding system ofthebuilding, as close tothepointofcable
entryas practical."
4. OPERATIONGUIDE
5. SERVICE NOTES (PLEASE READ)
5.1. SERVICENOTES
5.1.1. SIMPLIFIEDFAULT FINDINGDATA
SimplifiedSelf-DiagnosticSystem facilitates finding thecause ofthefault. A4digitfor faultcode
and communication for I2Cbuscodewill bedisplayedon TV screen.
TheSimplifiedFaultfinding dataisstoredintheMemoryIC(IC6004). Thisdataisclearedafterit
isdisplayed, and thenthePOWERbutton ispressedback on.
1. Withpowerturnedoff, press FF and REW buttonson unittogether
forover3seconds. Fig. 1-1
2. TVpowergoes on and theunitgoes intoservice mode.
4digitforfaultcodeand communication forI2Cbuscodewill be
displayed. Fig. 1-2
7

Fig. 1-3
Fig. 1-4
8

Fig. 1-5
3. Press anyoperation button exceptforPOWERon eithertheunit,
ortheremote todetect that akeyhas beenpressed.
The1st digitchanges to"0"onlywhenkeyisdetected.
Fig. 1-6
9

Note:
When1to4listedinLock codeoccurs, theVCR stopsand all VCR
function buttonsexceptforpowerbecomenon-operational.
5.1.2. SERVICE POSITION
5.1.2.1. Service Position
CAUTION:
HOTCIRCUIT(Primarycircuit) exists on theTV/VCR MainC.B.A.
and theTVPowerC.B.A. Use extremecaretopreventaccidental
shock whenservicing.
5.1.2.1.1. Service Position (1)
Fig. 2-1
5.1.2.1.2. Service Position (2)
Fig. 2-2
10

Note:
1. Whenrecording inService Position (2), shorttheS-TabSW. Pins
on foil sideofTV/VCR MainC.B.A. toturnthisSW. on.
Fig. 2-3
2. Whendisassembling/assembling, referto"CABINET SECTION"in
DISASSEMBLY/ASSEMBLYPROCEDURES.
5.1.3. HOTCIRCUIT
Primarycircuitexistson theTV/VCR MainC.B.A. and theTV PowerC.B.A.
Thiscircuitisidentifiedas " HOT" on theC.B.A. and intheService Manual. Use extremecareto
preventaccidental shock whenservicing.
5.1.4. SERVICE MODE
Inordertoinhibitdetection oftheSupply&Takeup PhotoTransistors, Reel Sensor, and Cylinder
Lock, place ajumperbetweenTP6001 and GND.
Inthismode, Mechanism movementcanbeconfirmed. Whenremoving CassetteUpAss'y, itcan
beconfirmedwithoutacassette.
Torelease from thismode, remove thejumperbetweenTP6001 and GND.
11

5.1.5. CAUTIONFORINSTALLATIONOFVCR UNIT
CAUTION:
OpenerLevermay bedamagedwhenVCR Unitisinstalled, withCassetteDoor-Lidand Opener
LeverofCassetteUpAss'y setincorrectly.
Install theVCR Unitas follows:
1. Swing theCassette Door-Lidall thewayopenuntil theCassette
DoortabclearstheOpenerLever.
2. Make surethat all guidetabsarealignedproperly. Then, press the
VCR Unitstraightin.
Fig. 3
5.1.6. HOWTOINITIALIZE MEMORY IC
AftertheMemoryIC(IC6004)or TV/VCR MainC.B.A. isreplaced, besuretosettheDefaultvalue
toMemoryICas shownin"MemoryICReference Table" below.
1. Press and holdSTOP, PLAY, and VOLDOWNbuttonson theunit
togetherover5secondswithno cassette inserted.
Theadjustmentoverlaywill appeartoEnterEVRAdjustmentmode.
Fig. 4-1
2. Set theDefaultvalueofall Control functionsusing aremote
control as shownin"MemoryICReference Table."
12

Note:
ForSelecting Control functionsand setting Defaultvalue, referto"
HOW TO ENTER EVR ADJUSTMENT MODE"and "HOW TO
ENTEREVR PG SHIFTER ADJUSTMENT MODE"inELECTRICAL
ADJUSTMENTprocedures. Fig. 4-2
3. Press and holdSTOP, PLAY, and VOLDOWNbuttonson theunit
togetherover5secondsagainorpress thePOWERbutton OFF to
release EVRAdjustmentMode.
TheDefaultvaluewill bewrittentoMemoryIC(IC6004).
4. Perform all EVRAdjustments. (Referto"EVR (Electronic Variable
Register) ADJUSTMENT WITH THE REMOTE CONTROL"in
ELECTRICALADJUSTMENTprocedures.)
5.1.7. METHODFORLOADING/UNLOADINGOFMECHANISM
5.1.7.1. (Manual Method)
Turn theLoading Gearclockwise (for loading)or counterclockwise (for unloading)using
needlenose pliersetc.
13

Note:
Donotuse thismethod ifMechanismisjammedorlocked.
Fig. 5-1
5.1.7.2. (Electrical Method)
Apply+10.0V DC PowerSupplytotheLoading Motor terminals.
Loading
DC+toPortion "a," DC -toPortion "b"
Unloading
DC -toPortion "a," DC+toPortion "b"
CAUTION:
Beforeapplying DC PowerSupply, besuretodisconnect theMotor
LeadsfromtheConnectorP2503.
Otherwise, theLoading MotorDriveIC(IC2501) maybedamaged.
Fig. 5-2
Whenloading withoutacassette, pushPortion "a" on theHolderUnitofCassetteUpAss'y so
thattheLevercleartheFirstTaband Second Tab.
Fig. 5-3
14

5.1.8. HOWTOREMOVE AJAMMEDTAPE
CAUTION:
WiperArm Unitmay bedamagedor itsspring may beoutofplace whenthejammedtapeis
removedbyforce.
Remove ajammedtapeas follows:
5.1.8.1. Manual Method
Whenatapejam isencountered, check thetapeloading condition and use thefollowing
proceduretoremove atapejam.
Fig. 6-1
5.1.8.1.1. Method -1:
1. MovethePinchRollerUnitoutbyunhooking thePinofPinchArm
Unitsothat thePinchRollerisseparatedfromtheCapstanRotor
Unitshaft. Fig. 6-2
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2. Removethetapefromthetapepath.
3. Rewind thetapeintothecassette byrotating theCenterClutch
Unitcounterclockwise.
4. UnhookSpring (A)oftheDriveRack Arm.
5. RemoveScrew (A).
6. Lift theCassette UpAss'y. Whilepulling theCassette UpAss'yout
farenough sothat itclearstheDriveRack Arm, slidetheDrive
Rack Unitas indicatedbythearrow toremovethecassettetape
fromtheCassette UpAss'y.
7. Check thecause ofmechanical troubleand repair.
Fig. 6-3
5.1.8.1.2. Method -2:
1. Rotate Loading Motorcounterclockwise withneedlenose pliers,
etc. sothat thePinchRollerisseparatedfromtheshaft ofthe
CapstanRotorUnit.
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2. Perform Step2through Step7ofMethod -1.
5.1.8.1.3. Method -3:
1. Perform Step2through Step7ofMethod -1.
Note:
Afterrepairing mechanical trouble, make surethat all gear
alignments arecorrect, especiallytheWiperArm Unitand Drive
Rack UnitofCassette UpAss'y. (Referto"EJECTPosition
Confirmation"inDISASSEMBLY/ASSEMBLYPROCEDURES.)
5.1.8.2. Electrical Method
Electrical method canonlybeperformedwhenthemechanism ismovedbyrotating theLoading
Gear.
CAUTION:
1. Beforeapplying DC PowerSupply, besuretodisconnect the
MotorLeadsfromtheConnectorP2503.
Otherwise, theLoading MotorDriveIC(IC2501) maybedamaged.
2. Ifloading does notstartinapprox. 2secondsafterDC Power
Supplyisapplied, DO NOTcontinuetoapplyDC PowerSupply.
Instead, perform "Manual Method."
1. Besuretodisconnect theMotorLeadsfromtheConnectorP2503.
2. Apply+10.0VDC PowerSupplytotheLoading Motorterminals.
3. WhentheLoading Posts reachthefullyunloadedposition, remove
thePowerSupply. Fig. 7
4. Rewind thetapeintothecassette byturning theCenterClutchUnit
17

counterclockwise.
5. Eject thecassette byapplying+10.0VDC PowerSupplyagain.
5.1.9. VCR Test Mode
High Voltageisinhibitedbyconnecting JumperJ801 on theTV/VCR MainC.B.A., however, itis
possibletocheck theVCR evenwhenCRTC.B.A. and AnodeCapareremoved.
5.1.10. WIRE AND LEAD POSITIONDIAGRAM
Fig. 8
5.1.11. DEFEATINGTHE AUTOTRACKING
TodefeattheAutoTracking Function, place theinstrumentintheSTOP modeand place ajumper
betweenTP6003 and TP6009 on theTV/VCR MainC.B.A. Thetracking will beplacedintheneutral
position.
18

5.1.12. HOWTOSETTRACKINGTOTHE NEUTRALPOSITION
Ejecting thecassettetapeand thenreinserting itwill resetthetracking totheNeutral position.
5.1.13. BLACK SCREWS ONTHE CHASSIS
Black Screwsareusedon theMechanism Chassistoidentifyscrewsthatrequireadjustment.
5.1.14. HOWTORESETALL COMBINATIONVCR MEMORY FUNCTIONS
Toreset(clear)theselectlanguage, channel autosetand setclock functionstotheirinitial
poweron condition (poweron, no cassetteinserted), holddownthePLAYand FF buttonson the
unittogetherfor morethan5seconds.
Powerwill shutoff.
5.1.15. HOWTOCONFIRMAUTOCLOCK SETFEATURE
1. Connect anRFcablefromtheoutputofoneunittotheinputofthe
test unit.
2. Select corresponding RFchannels.
3. Playback arecording ofP.B.S. channel including clock set data
and confirm thisfeature.
5.1.16. VARIABLE VOLTAGE ISOLATIONTRANSFORMER
AnIsolation Transformershouldalways beusedduring theservicing ofCombination VCR whose
chassisisnotisolatedfrom theACpowerline. Use atransformerofadequatepowerrating as
thisprotectsthetechnicianfrom accidentsresulting inpersonal injuryfrom electrical shocks. It
will alsoprotectCombination VCR from being damagedbyaccidental shorting thatmay occur
during servicing.
Also, whentroubleshooting theabove typeofPowerSupplyCircuit, avariableisolation
transformerisrequiredinordertoincrease theinputvoltageslowly.
5.1.17. SPECIALNOTE
All integratedcircuitsand manyothersemiconductor devices areelectrostaticallysensitive and
thereforerequirethespecial handling techniques describedunderthe
"ELECTROSTATICALLYSENSITIVE (ES)DEVICES" section ofthisservice manual.
5.1.18. REPLACEMENTPROCEDURE FORLEADLESS (CHIP)COMPONENTS
Thefollowing procedures arerecommendedfor thereplacementoftheleadless components
usedinthisunit.
1. Preparation forreplacement
A. Soldering Iron
Use apencil-typesoldering iron that uses less than30 watts.
B. Solder
EutecticSolder(Tin63%, Lead37%)isrecommended.
C. Soldering time
Donotapplyheat formorethan4seconds.
D. Preheating
Leadless capacitormust bepreheatedbeforeinstallation. -
19

(266°F~302°F)
(130°C~150°C)forabouttwominutes.
Note:
A. Leadless components must notbereusedafterremoval.
B. Excessivemechanical stress and rubbing ofthecomponent
electrodemust beavoided.
2. Removing theleadless component
Grasptheleadless componentbodywithtweezersand alternately
applyheat tobothelectrodes. Whenthesolderon bothelectrodes
ismelted, removetheleadless componentwithatwisting motion.
Note:
A. Donotattempttolift thecomponentoff theboarduntil the
componentiscompletelydisconnectedfromtheboardbya
twisting action.
B. Becareful nottobreak thecopperfoil on theprintedcircuit
board. Fig. 9-1
3. Installing theleadless component
A. Presolderthecontact points on thecircuitboard.
Fig. 9-2
B. Press thepartdownwardwithtweezersand solderboth
electrodes as shownbelow.
Fig. 9-3
Note:
20