Panasonic NV-FJ625EG User manual

ORDERNO. VRD0103011C2
VideoCassette Recorder
NV-FJ625EG / NV-FJ625EGY/ NV-FJ625B / NV-FJ625EC/ NV
-FJ625ECM/ NV-FJ625ECN / NV-FJ625ECY
Z-MECHANISM
SPECIFICATIONS
2001 Matsushita ElectricIndustrial Co., Ltd. All rights reserved.
Unauthorizedcopying and distribution isaviolation oflaw.
1

1. INTRODUCTION
Thisservice manual containstechnical information whichwill allowservice personnel to
understand and service thismodel.
Ifthecircuitischangedor modified, thisinformation will befollowedbysupplementaryservice
manual tobefiledwithoriginal service manual.
Note:
1. Adjustmentprocedures, DisassemblyProcedures and Assembly
Procedures forMechanismChassisareseparate volumefromthis
service manual. / Please refertotheservice manual forZ-
MechanismChassis. (OrderNo. VRD9802005C2)
2. TheModel No. isindicatedon theSchematicDiagramand Circuit
BoardDiagramsas follows.
Model No. Indication Mark
NV-FJ625EG (A)
NV-FJ625EGY (B)
NV-FJ625B (C)
NV-FJ625EC/ECM/ECN (D)
NV-FJ625ECY (E)
2. GENERALDESCRIPTIONS
2.1. SERVICECAUTION
2.1.1. REPLACINGIC7702/EEPROM
WhentheEEPROM:IC7702 isreplaced, applicablemodel code, option codeand electrical
adjustmentdatawill notbeavailable.
Therefore, enterand/or adjustthenecessarydataafterreplacing IC7702 byreferring following
procedure.
STEP1.REPLACE THE IC7702
1. RemovetheC.B.A. withMechanismunitbyreferring the
Disassemblyprocedure.
2. Disconnect theACplug and replace theIC7702.
2

STEP2.INPUTTHE MODEL&OPTIONCODE
1. Set up theapplicablemodel codeand option codebyordering the
following table.
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 thePOWERButton to
turn thepoweron.
(Colon starts
flashing)
EntertheModel and Option Code.
6.SettheapplicableModel and Option codeby
using REW, PLAY, STOP and FF keys on the
RemoteController. (See Fig.S1&S2)
Exitfrom Service Mode.
7.Press thePOWERButton to
turn thepoweroff.
8. Press FF and EJECTkeys
simultaneouslyin6times.
(Normal
Indication)
Fig.S1Service Secreen(sample)
3

Model No. Model
Code Option Code1 Option Code2 Option Code3
NV-FJ625EG/
EGY 97 (61h) 8 (08h) 244 (F4h) 6 (06h)
NV-FJ625B 99
(63h) 40 (28h) 244 (F4h) 5 (05h)
NV-FJ625EC/
ECM/ECN/
ECY
98
(62h) 8 (08h) 244 (F4h) 6 (06h)
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
fiexiblecardfromtheFPCHolder.
D. RemovetheCYLINDERUNIT.
CAUTION:
HandletheCylinderfiexiblecardwithcare. Whenitdamaged, you
shouldreplace wholeCylinderunit.
Fig. S3
4

2. UPPERCYLINDERDISASSEMBLY
A. Remove2screws(A).
B. RemovetheCylinderStatorUnit.
C. Remove2screws(B).
D. RemovetheCylinderRotorUnit.
E. Loose Hex screw (C)(1.5mm)and removetheCYLINDER
RETAINER.
F. RemovetheUpperCylinder. Fig. S4
5

3. UPPERCYLINDERASSEMBLY
Whenreassembling, perform thestepsinthereverse order.
Notes:
1. Install theCylinderRetainersothat the2holes on top ofthe
CylinderRetainerareat rightangles withtheP3502 Connection.
2. TightentheHex screw (C)(1.5mm)whilepressing downon top of
theCylinderRetainer. Fig. S5
6

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
7. Confirm thePG SHIFTERADJUSTMENTwiththealignmenttape
7

(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
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
8

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
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.
9

VFK0923FT
(For Service usage)
TypeofCassette Full VHS Cassette
Cleaning Time 10 Seconds/Time
TapeLength 20 m
UsabilityinaPath 180 Times
VFK0823FSE
(For end users)
TypeofCassette Full VHS Cassette
Cleaning Time 10 Seconds/Time
TapeLength 3.34 m
UsabilityinaPath 30 Times
10

VFK0823FSE
(For end users)
Note:
Thetapematerial itselfisthesameinbothtypes.
2.4. SELF-DIAGNOSISRESULT DISPLAY
The"SELF-DIAGNOSIS RESULTDISPLAY&MEMORYfunction isbuiltinthisVTR.
ItmeansthatwhentheVCR detectsundesirablecondition, itcanbedisplayeda“Error code
(Twonumbersfrom theleft)”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
VRD9612M129.
11

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
2.5. CAUTIONFORACMAINSLEAD(NV-FJ625B)
3. ADJUSTMENTPROCEDURES
3.1. DISASSEMBLYMETHOD
3.1.1. DISASSEMBLY FLOWCHART
Thisflowchartindicates disassemblystepsofthecabinetpartsand thecircuitboardsinorderto
find thenecessaryitemsfor servicing.
Whenreassembling, perform thestepsinthereverse order.
Fig. D1
12

3.1.2. DETAILOFDISASSEMBLY METHOD
1. REMOVALOFTHETOPPANEL
Remove 4 Screws(A)
Fig.D2
2. REMOVALOFTHEFRONTPANELUNIT
Unlock 7 Tabs(B)
Fig. D3
13

3. REMOVALOFTHEMECHANISMUNIT
Remove Screw(C)
Remove 3 Screws(D)
Remove 2 screw(E)
Note:
1. Keeppressing 2stopperson Cassette HolderPlate and Press
Cassette HolderPlate totherear.
2. RemovetheMechanismUnitafterbend theCylinderShieldinthe
direction ofthearrow.
Fig. D4
4. REMOVALOFTHEMAINC.B.A.
14

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
15

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. VHSBlankTape
11. VHSAlignmentTape
-Parts No.:VFJ8125H3F(PAL)
3.3.2. VCR SETTING
Whenno indication intheprocedure, seteachselector as follows.
16

1. TAPE SPEED:SP
2. CHANNEL:AV1/AV2/AV3
(Set tosignal inputterminal number)
3.3.3. ADJUSTMENTS
ITEM TP ADJ. MODE INPUT TAPE M. EQ. SPEC.
REMARKS
PGSHIFTER
/
ADJUSTMENT
--- --- PLAYBACK --- ALIGNMENT
TAPE /
(PAL)
--- --- Referto
procedure
PG
SHIFTER
ADJUSTMENT
shownin
Fig.E3.
AIFUNCTION
/
ADJUSTMENT
--- --- PLAYBACK
/ (SELF-
REC)
PAL/
COLOUR
/ BAR
BLANK /
TAPE --- --- Refertothe
procedure
ofAI
FUNCTION
ADJUSTMENT
shownin
Fig.E4.
VIDEO/
FREQUENCY
/ RESPONSE
/
ADJUSTMENT
VIDEO
OUT --- SP/LP/EP /
PLAYBACK
/ (SELF-
REC)
VIDEO/
SWEEP
/ (See
Fig.E1)
BLANK
TAPE OSCILLO/
SCOPE/ /
VIDEO
SWEEP
GENERATOR
SP:0+-1
(dB)
(90~110%)
LP:0+-1
(dB)
(90~110%)
EP:0+-3
(dB)
(70~140%)
(See Fig.
E2)
Refertothe
procedure
ofVIDEO
FREQUENCY
RESPONSE
ADJUSTMENT
shownin
Fig.
Fig.E1 Fig.E2
CONDITION: BURSTSIGNALOFF /
75 ohm TERMINATED
17

3.3.4. PGSHIFTERADJUSTMENT/ (AUTOMATIC)
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. E3
3.3.5. AIFUNCTIONADJUSTMENT(AUTOMATIC)
18

PROCEDURES FIP DISPLAY
Press theFF and EJECTKeys
simultaneouslyfor 3seconds.
Press theFF and EJECTKeys
simultaneouslytwice.
Press theEJECTkey for 3
seconds.
Press theCH UP key in3times.
Inserttheblankcassettetape.
(Theadjustmentis
automaticallystarted.)
Whenthesequence oftheautomatical adjustment
has beenterminatedsuccessfully, theVCR goes to
STOP mode.
Release theService modebypressing theEJECT
and FF keys simultaneouslyin6times until theFIP
becomes normal indication.
Fig. E4
3.3.6. VIDEOFREQUENCY RESPONSE ADJUSTMENT
PROCEDURES FIP DISPLAY
InputtheVideosweepsignal.
(See Fig.E1)
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/EP
mode)
ConnecttheOscilloscopeto:
*CH1....VideoOut(TW3002).
*CH2....V.FREQ.(TW6002)
19

PROCEDURES FIP DISPLAY
Press the"4" key on theremotecontroller.
(Confirm thatTW6002 becomes high(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.
Fig. E5
3.3.7. LOCATIONOFTESTPOINTS &CONTROLS
3.3.8. CIRCUITBOARD LAYOUT
20