Panasonic NV-SV120EG User manual

ORDERNO. MABR0303007C2
VideoCassette Recorder
NV-SV120EG
Z-MECHANISM
SPECIFICATIONS
2003 Matsushita ElectricIndustrial Co., Ltd. All rights reserved.
Unauthorizedcopying and distribution isaviolation oflaw.
1. INTRODUCTION
1.1. INTRODUCTION
Thisservice manual containstechnical information whichwill allowservice personnel to
understand and service thismodel.
1

Ifthecircuitischangedor modified, thisinformation will befollowedbysupplementaryservice
manual tobefiledwithoriginal service manual.
Note:
Adjustmentprocedures, DisassemblyProcedures and AssemblyProcedures for Mechanism
Chassisareseparatevolumefrom thisservice manual. / Please refertotheservice manual for Z-
Mechanism Chassis. (OrderNo. VRD9802005C2)
1.2. ABOUTLEADFREE SOLDER(PbF)
Distinction ofPbF PCB:
PCBs(manufactured)using leadfree solderwill have aPbF stampon thePCB.
Caution:
-Pbfree solderhas ahighermelting pointthanstandardsolder,
Typicallythemelting pointis50-70°F(30-40°C)higher. Please use
ahigh temperaturesoldering iron. Incase ofsoldering iron with
temperaturecontrol,please set itto700±20°F(370±10°C)
-Pbfree solderwill tend tosplashwhenheatedtoo high (about
1100°F/600°C).
Whensoldering or unsoldering, please completelyremove all ofthesolderon thepinsor solder
area, and besuretoheatthesoldering pointswiththePbfree solderuntil itmeltsenough.
2. GENERALDESCRIPTIONS
2.1. SERVICECAUTION
2.1.1. REPLACINGIC6002/EEPROM
WhentheEEPROM:IC6002 isreplaced, applicablemodel code, option codeand electrical
adjustmentdatawill notbeavailable.
Therefore, enterand/or adjustthenecessarydataafterreplacing IC6002 byreferring following
procedure.
STEP1.REPLACE THE IC6002
1. RemovetheC.B.A. withMechanismunitbyreferring the
Disassemblyprocedure.
2. Disconnect theACplug and replace theIC6002.
STEP2.INPUTTHE MODEL&OPTIONCODE
1. Set up theapplicablemodel codeand option codebyordering the
following table.
2

PROCEDURE F.I.P. DISPLAY
Turn on theService Mode
1.Press theFF key and the
EJECTkey simultaneouslyfor
morethan3seconds.
ActivatetheService Mode2
2.Whilekeepplacing FF key,
press theEJECTkey intwice.
ActivatetheEntering Mode.
3.Press theEJECTkey for more
than3seconds.
SettheMode2.
4.Press theCH UP key intwice.
Display theSetting Code.
5.Press thePOWERkey toturn
thepoweron.
(Colon starts
flashing)
EntertheModel and Option Code.
6.Service Screenisdisplayedon themonitor.
7.SettheapplicableModel and Option codeby
using REW, PLAY, STOP and FF keys on theRemote
Controller. (See Fig.S1&S2)
Exitfrom Service Mode.
8.Press thePOWERkey toturn
thepoweroff.
9. Press FF and EJECTkeys
simultaneouslyin6times.
(Normal
Indication)
Fig.S1Service Screen(sample)
3

Model No. MC OC1 OC2
NV-SV120EG 61h 74h 78h
Fig. S2Model Code&Option Code
NOTE:
Since all electrical adjustmentsdataisstill notavailable, perform theElectrical Adjustment
continuously.
2.1.2. CYLINDERUNITREPLACEMENT
1. CYLINDERUNITREPLACEMENT
A. RemovethemechanismunitfromMAINC.B.A./Chassisby
referring “SECTION2. DisassemblyProcedure”.
B. Removethe3screws(A)oftheCYLINDERUNITwithascrew
driver.
C. Unlock the4locking tabs(B)and disconnect theCylinder
flexiblecardfromtheFPCHolder.
D. RemovetheCYLINDERUNIT.
CAUTION:
HandletheCylinderflexiblecardwithcare. Whenitdamaged, you
shouldreplace wholeCylinderunit.
Fig. S3
2. UPPERCYLINDERDISASSEMBLY
A. Remove2screws(A).
B. RemovetheCylinderStatorUnit.
C. Remove2screws(B).
D. RemovetheCylinderRotorUnit.
4

E. Loose Hex screw (C)(1.5mm)and removetheCYLINDER
RETAINER.
F. RemovetheUpperCylinder. Fig. S4
3. UPPERCYLINDERASSEMBLY
Whenreassembling, perform thestepsinthereverse order.
Notes:
1. Install theCylinderRetainersothat the2holes on top ofthe
CylinderRetainerareat rightangles withtheP5001 Connection.
5

2. TightentheHex screw (C)(1.5mm)whilepressing downon top of
theCylinderRetainer. Fig. S5
3. Install theCylinderRotorUnitsothat theinnerholeoftheCylinder
RotorUnitfits tothesmall projection (D)on top oftheUpper
Cylinder.
4. Tighten2screws(B). Fig. S6
5. install theCylinderStatorUnit.
6. Tighten2screws(A). Fig. S7
6

7. Confirm thePG SHIFTERADJUSTMENTwiththealignmenttape
(PAL:VFJ8125H3F)and adjust itifnecessary.
2.1.3. CHECKINGOFMAINC.B.A.
Whenservicing theMAINC.B.A., take outtheMAINC.B.A. and mechanism from theframeand
turn over.
Fig. S8
2.1.4. FLATCARD CABLE INSTALLATION
Wheninstalling theFlatCard Cableon theconnector, install theFlatCard Cablewiththecable
contactsfacing theconnector contacts.
Fig. S9
7

2.2. REMOVALOFCASSETTETAPE
Thereare2ways toremove acassettetape.
1. Service Information DisplayOperation
A. Press theFF and EJECTkeyssimultaneoslyfor3secondsand
set theService Mode7.
B. Press STOPkeyinordertorotate theLoading Motorfor
unloading operation. (Payanattention oftapeslack)
2. Manual Operation
A. Disconnect theACMainsLeadand removetheTop Panel.
B. Rotate theMainCamGearclockwise until theLoading Posts
movetofullyunloadedposition as shownin Fig. S10 . (Tapeis
remaining) Fig. S10
C. Rotate theCapstanMotorclockwise fromthebottomsideto
take up thetape. Fig. S11
D. Rotate theMainCamGearclockwise until thecassette tapeis
ejected.
2.3. INTRODUCTIONOFVIDEO HEADCLEANING CASSETTE/
(POLISHING TYPE )
1. Wearepleasedtointroduce PanasonicVideoHeadCleaning
8

Cassette, VFK0923FT [forservice purposes] and VFK0923FSE [for
end users] forall VHS/SVHSVCPand VCR.
2. These cleaning cassettes areexclusiveremoving thehardand
stickyclogging on videoheads.
3. These improvetheefficiencyofvideoheadcleaning service and
shortening cleaning timeforend users.
VFK0923FT
(For Service usage)
TypeofCassette Full VHS Cassette
Cleaning Time 10 Seconds/Time
TapeLength 20 m
UsabilityinaPath 180 Times
9

VFK0823FSE
(For end users)
TypeofCassette Full VHS Cassette
Cleaning Time 10 Seconds/Time
TapeLength 3.34 m
UsabilityinaPath 30 Times
Note:
Thetapematerial itselfisthesameinbothtypes.
2.4. SELF-DIAGNOSISRESULT DISPLAY
The"SELF-DIAGNOSIS RESULTDISPLAY&MEMORYfunction isbuiltinthisVTR.
ItmeansthatwhentheVCR detectsundesirablecondition, itcanbedisplayeda“Error code
(Twonumbersfrom theright)”withService Mode2.
Since the"Error code" isstoredintheEEPROM, itcanbedisplayedalthough afterdisconnected
theACleads. ItcanbedisplayedwithService Mode2.
(Ifasecond error hadbeendetected, onlythemostrecenterror isdisplayed. )
For moredetails, refertotheService Manual for Z-Mechanism ChassisOrdernumber
VRD9802005C2.
10

INDICATION CAUSE REMEDY/CHECK
01 Aftercylinderlock isdetected, thecylinder
does notstartrotating againevenaftertape
unloading.
Check thecylindermotor drive
circuit.
02 Cassettetapeisnotwound up during thetape
unloading exceptEJECTmode. Check thecapstanmotor drive
circuit.
03 Mechanism locks during modetransition
exceptEJECTmode.
1. Check theloading motordrivecircuit.
2. Check themechanismphase alignment.
3. Check themodeswitch.
04 Mechanism locks during tapeunloading. 1. Check theloading motordrivecircuit.
2. Check themechanismphase alignment.
06 Mechanism locks aftertapeunloading in
EJECTmode.
1. Check theloading motordrivecircuit.
2. Check themechanismphase alignment for
cassette
07 During recording mode, recording signal is
less thanthenormal condition. Protection oftheover-current
flowing
transistor whichproduces the
power
for recording mode.
08 Recording circuitworks exceptrecording
mode. Check therecording circuit.
16 Cylinderlock detection. Check thecylinderunitand the
cylinder
drive circuit.
17 Supplyreel mechanism lock detection Check thesupplyreel mechanism
and
supplyreel circuit.
18 Take-up reel mechanism lock detection Check theTake-up reel mechanism
and
Take-up reel circuit.
2* PGshifterautomaticadjustmenterror. Check theservo/system control
circuit
cylinderunit.
Fig. T1Self-Testindication Display
3. ADJUSTMENTPROCEDURES
3.1. DISASSEMBLYMETHOD
3.1.1. DISASSEMBLY FLOWCHART
Thisflowchartindicates disassemblystepsofthecabinetpartsand thecircuitboardsinorderto
find thenecessaryitemsfor servicing.
Whenreassembling, perform thestepsinthereverse order.
Fig. D1
11

3.1.2. DETAILOFDISASSEMBLY METHOD
1. REMOVALOFTHETOPPANEL
Remove 4 Screws(A)
Fig.D2
2. REMOVALOFTHEFRONTPANELUNIT
Unlock 7 Tabs(B)
Fig. D3
12

3. REMOVALOFTHEMECHANISMUNIT
Remove Screw(C)
Remove 3 Screws(D)
Remove 2 Screws(E)
Note:
1. Keeppressing 2stopperson Cassette HolderPlate and Press
Cassette HolderPlate totherear.
2. RemovetheMechanismUnitafterbend theCylinderShieldinthe
direction ofthearrow.
Fig. D4
4. REMOVALOFTHEMAINC.B.A.
13

Remove 4 Screws(F)
Unlock 4 Tabs(G)
Fig. D5
NOTE:
Beforemounting theMAINC.B.A. ontotheframe, besuretoconfirm thattheinsulation sheetis
mountedon theframeas shownin Fig. D6 .
Fig. D6
5. SERVICING POSITION Fig. D7
14

3.2. MECHANICALADJUSTMENTPROCEDURES
RefertotheService Manual for Z-Mechanism Chassis. / (OrderNo. VRD9802005C2)
3.3. ELECTRICALADJUSTMENTPROCEDURES
3.3.1. TESTEQUIPMENT
Thefollowing equipmentsarerequiredfor Electrical Adjustments.
1. Dual-Trace Oscilloscope
-VoltageRange:0.005-5V/div
-FrequencyRange:DC-35MHz
-Probes:10:1/ 1:1
2. FrequencyCounter
-FrequencyRange:0-10MHz
-Probes:1:1
3. Universal Counter
4. Digital VoltMeter(D.V.M.)
5. VideoSweepGenerator
6. SinewaveGenerator
7. VideoPatternGenerator
8. MonitorTV
9. DC PowerSupply
10. VHS/S-VHSBlankTape
11. VHSAlignmentTape
-Parts No.:VFJ8125H3F(PAL)
3.3.2. VCR SETTING
15

Whenno indication intheprocedure, seteachselector as follows.
1. TAPE SPEED:SP
2. CHANNEL:AV1/AV2/AV3
(Set tosignal inputterminal number)
3. S-VHSSW:ON
3.3.3. ADJUSTMENTS
Fig.E1 Fig.E2 Fig.E3
CONDITION: BURSTSIGNALOFF /
75ohm TERMINATED
CONDITION: BURST
SIGNAL
75ohm
TERMINATED
Fig.E4
3.3.4. PGSHIFTERADJUSTMENT/ (AUTOMATIC)
16

PROCEDURES FIP DISPLAY
Press theFF and EJECTKeys
simultaneouslyfor 3seconds.
Press theFF and EJECTKeys
simultaneouslytwice.
Press theEJECTkey for 3
seconds.
Press theCH UP key once.
InserttheAlignmentcassette
tape. (PAL:VFJ8125H3F)
Whenthesequence oftheautomatical adjustment
has beenterminated, thefollowing action has been
made.
*SUCCEED: Thecassettetapeisejected.
*ERROR:The"F2"isdisplayedon theFIP.
(Check theServo/Syscon circuitand
Cylinderunit.)
Release theService modebypressing theEJECT
and FF keys simultaneouslyin6times until theFIP
becomes normal indication.
Fig. E5
3.3.5. S-VHS VIDEOFREQUENCY RESPONSE ADJUSTMENT
17

PROCEDURES FIP DISPLAY
Setthe3DDNR SWtoON, and
theS-VHS RECtoONinOSD
menu fuction. / InserttheS-VHS
BLANK TAPE. / InputtheVideo
sweepsignal (See Fig. E1)to
AV3(S-VIDEOIN) and record it
inSP and LP.
Press theFF and EJECTKeys
simultaneouslyfor 3seconds.
Press theFF and EJECTKeys
simultaneouslytwice.
Press theEJECTkey for 3
seconds.
Press theCH UP and/or CH
DOWNkey until "11" is
displayedon FIP.
InserttheSelf-recordedtape
and playback it. (SP/LP mode)
ConnecttheOscilloscopeto:
*CH1....VideoOut(TW3021).
*CH2....V.FREQ.(TW6002)
Press the"4" key on theremotecontroller.
(Confirm thatTW6002 becomes high(2.5V)).
AdjusttheFrequency response bypressing the
"2"(increase)and/or "8"(decrease)key on the
RemoteController. (See Fig.E2)
StoretheAdjustedvaluebypressing the"5" key on
theRemoteController.
Release theService modebypressing theEJECT
and FF keys simultaneouslyin6times until theFIP
becomes normal indication.
F6
3.3.6. VHS VIDEOFREQUENCY RESPONSE ADJUSTMENT
18

PROCEDURES FIP DISPLAY
SettheS-VHS ETRECtoOFF in
OSDmenu function, butthe3D
DNR SWtoON. / InserttheVHS
BlankTape. / InputtheVideo
sweepsignal (See Fig. E3)to
AV1(VIDEOIN) and record itin
SP and LP.
Press theFF and EJECTKeys
simultaneouslyfor 3seconds.
Press theFF and EJECTKeys
simultaneouslytwice.
Press theEJECTkey for 3
seconds.
Press theCH UP and/or CH
DOWNkey until "11" is
displayedon FIP.
InserttheSelf-recordedtape
and playback it. (SP/LP mode)
ConnecttheOscilloscopeto:
*CH1....VideoOut(TW3002).
*CH2....V.FREQ.(TW6002)
Press the"4" key on theremotecontroller.
(Confirm thatTW6002 becomes high(2.5V)).
AdjusttheFrequency response bypressing the
"2"(increase)and/or "8"(decrease)key on the
RemoteController. (See Fig.E4)
StoretheAdjustedvaluebypressing the"5" key on
theRemoteController.
Release theService modebypressing theEJECT
and FF keys simultaneouslyin6times until theFIP
becomes normal indication.
Fig. E7
3.3.7. LOCATIONOFTESTPOINTS &CONTROLS
19

3.3.8. CIRCUITBOARD LAYOUT
4. ABBREVIATIONS
5. INPUT/OUTPUTCHART
5.1. INPUT/OUTPUTCHARTFORIC6001
5.2. TRUTHTABLE
6. WAVEFORMTABLE&VOLTAGECHART
6.1. WAVEFORMTABLE
6.2. VOLTAGECHART
20