Sharp VL-MC500U User manual

VL-MC500U/K
1
In the interests of user-safety (Required by safety regula-
tions in some countries) the set should be restored to its
originalconditionandonlypartsidenticaltothosespecified
be used.
S72M7VL-MC500
LIQUID CRYSTAL DIGITAL CAMCORDER NTSC
SERVICE MANUAL
Page
1. IMPORTANT SERVICE NOTES ........................................................................................................ 2
2. SPECIFICATIONS.............................................................................................................................. 6
3. PART NAMES .................................................................................................................................... 7
4. DISASSEMBLY OF THE SET ............................................................................................................ 8
5. MECHANISM ADJUSTMENT JIGS AND PARTS............................................................................ 10
6. INSPECTION AND MAINTENANCE
ITEMS AND INTERVALS ................................................................................................................. 11
7. MECHANICAL ADJUSTMENTS AND CHECKS.............................................................................. 12
8. TAPE RUNNING ADJUSTMENT ..................................................................................................... 15
9. MECHANICAL SECTION ASSEMBLY AND PARTS REPLACEMENT
(DISASSEMBLY AND REASSENBLY) ........................................................................................... 17
10.ADJUSTING THE ELECTRICAL CIRCUITS.................................................................................... 24
11.USEFUL TIPS................................................................................................................................... 41
12.SIGNAL FLOW DIAGRAMS ............................................................................................................. 42
13.BLOCK DIAGRAMS ......................................................................................................................... 45
14.SCHEMATIC DIAGRAMS ................................................................................................................ 52
15.SEMICONDUCTOR LEAD IDENTIFICATION ............................................................................... 108
16.PRINTED WIRING BOARD ASSEMBLIES.................................................................................... 110
17.REPLACEMENT PARTS LIST ....................................................................................................... 125
18.PACKING OF THE SET ................................................................................................................. 145
CONTENTS
This document has been published to be used for
after sales service only.
Thecontentsaresubject tochangewithoutnotice.
SHARP CORPORATION
VL-MC500U
VL-MC500K
MODELS
SERVICE MANUAL LIQUID CRYSTAL DIGITAL CAMCORDER
NTSC
MODELS VL-MC500U/K

2
VL-MC500U/K
1. IMPORTANT SERVICE NOTES
1. NOTES DE SERVICE IMPORTANTES
BEFORE RETURNING THE VIDEO CAMERA
RECORDER
Beforereturning the videocamera recorder totheuser,
perform the following safety checks.
1. Inspect all lead dress to make certain that leads are
not pinched or that hardware is not lodged between
thechassisandothermetalpartsinthevideocamera
recorder.
2. Inspect all protective devices such as non-metallic
control knobs, insulating materials, cabinet backs,
adjustment and compartment covers or shields, isola-
tion resistor/capacitor networks, mechanical insula-
tors etc.
3. To be sure that no shock hazard exists, check for
leakage current in the following manner.
· Plug the AC line cord directly into a 120 volt AC outlet
(Do not use an isolation transformer for this test).
· Usingtwoclipleads,connectal.5kohm,10wattresistor
paralleled by a 0.15µF capacitor in series with all
exposed metal cabinet parts and a known ground,
such as a water pipe or conduit.
· UseaVTVMorVOMwith1000ohmpervolt,orhigher
sensitivityormeasuretheACvoltagedropacrossthe
resistor (See Diagram).
· Move the resistor connection to all exposed metal
parts having a return path to the chassis (antenna
connections, metal cabinet, screw heads, knobs and
controlshafts,etc.) and measure the AC voltage drop
across the resistor. Reverse the AC plug (a non
polarized adaptor plug must be used but only for the
purpose of completing these checks) on the set and
repeat the AC voltage measurements for each ex-
posed metallic part. Any reading of 0.45V rms (this
corresponds to 0.3mA rms AC.) or more is excessive
and indicates a potential shock hazard which must be
correctedbeforereturningthevideo camera recorder
to the user.
VTVM
AC SCALE
1.5k ohms
10W
CONNECT TO
KNOWN EARTH
GROUND
TO EXPOSED
METAL PARTS
0.15 µF
TEST PROBE
AVANT DE RENDRE LE MAGNETOSCOPE
Avantderendrelemagnétoscopeàl’utilisateur,effectuer
les vérifications de sécuritésuivantes.
1. Vérifier toutes les gaines de fil pour être sûr que les fils
ne sont pas pincés ou que le matériel n’est pas coincé
entrelechâssisetlesautrespiècesmétalliquesdansle
magnétoscope.
2. Vérifier tous les dispositifs de protection tels que les
boutonsdecommandenonmétalliques,lesmatériaux
d’isolement, le dos du coffret, les couvercles de
compartiment et ajustement ou les boucliers, les
réseaux de résistance / condensateur d’isolement,
Ies isolateurs mécaniques, etc.
3. Pourêtresûrqu’iln’yaaucunrisquedechocélectrique,
vérifier le courant de fuite de la maniére suivante.
·Brancherlecordond’alimentationsecteurdirectement
dans une prise de courant de 120 volts. (Ne pas
utiliserde transformateurd’isolementpour cetessai).
·Utiliserdeuxfilsàpinceset connecter une résistance
de 10 watts 1,5 kohm en parallèle avec un
condensateurde0,15µFensérieavecdespiècesdu
coffret métallique exposées et une masse de terre
connue telle qu’un tuyau ou un conduit d’eau.
·Utiliser un VTVM ou VOM avec une sensibilitéde
1000 ohms par volt ou plus ou mesurer la chute de
tension CA entre la résistance (voir diagramme).
·Déposer la connexion de la résistance àtoutes les
pièces métalliques exposées ayant un parcours de
retour au châssis (connexions d’antenne, coffret
métallique,tétesdevis,boutonsetarbresdecommande,
etc.)etmesurerlachutedetensionCAentrelarésistance.
InverserlaficheCA(uneficheintermédiairenonpolarisée
doitêtreutiliséeàseulefindefairecesvérifications.)sur
l’appareil et répéter les mesures de tension CA pour
chaque piéce métallique exposée. Toute lecture de
0,45 V rms (ceci correspond à0,3 mA rms CA) ou plus
estexcessiveetsignaleundangerdechocquidoitêtre
corrigéavant de rendre le magnétoscope àson
utilisateur.
0.15 µF
SONDE D'ESSAI
VERS PIECES
METALLIQUES
EXPOSEES
VTVM
ECHELLE CA
1.5KOHMS
10W
CONNECTER A
UNE MASSE DE
TERRE CONNUE

VL-MC500U/K
3
WARNING :TO REDUCETHE RISK OF FIRE OR ELECTRIC SHOCK,DO NOT EXPOSE
THIS APPLIANCETOWET LOCATIONS.
CAUTION: TO REDUCE THE RISK OF ELECTRIC
SHOCK. DO NOT REMOVE COVER. NO
USER·SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE
PERSONNEL.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
ATTENTION:POURREDUIRELESRESQUESD'INCENDIEOUDECHOCELECTRIQUE,
NE PAS EXPOSER CET APPAREIL A LA PLUIE OU A L'HUMIDITE.
ATTENTION: AFIN DE REDUIRE LES RISQUES DE
CHOC ELECTRIQUE, NE PAS RETIRER LE
COUVERCLE, AUCUN ORGANE INTERNE
NE PEUT ETRE REPARE PAR
L'UTIUSATEUR, CONFIER L'APPAREIL A
UN DEPANNEUR QUALIFIE.
ATTENTION
This symbol alerts the user that there are
importantoperatingandmaintenanceinstruc-
tions in the literature accompanying this unit.
This symbol warns the user of uninsulated
voltagewithintheunitthatcancausedanger-
ous electric shocks.
Ce symbole signale àl'utilisateur la présence
d'unetensionnonisoléeàl'intérieurdel'appareil
quipeutêtrelacausedesecoussesélectriques
dangereuses.
Ce symbole avertit l'utilisateur que des in-
structions importantes relatives àl'utilisation
et àl'entretien se trouvent dans le manuel
accompagnant l'appareil.
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR
ATTENTION
Ce symbole signifie que l'on devra uti-
liser un fusible de même type (CP1;
1,25A24V,CP2;1,25A 24V, CP3; 1,25A
24V, CP4; 0,5A 50V, F1; 1A 50V) pour
assurer la sécurité.
*Note: CP4 est exceptéVL-MC500K.
Ce symbole signifie que l'on devra uti-
liser un fusible de même type (F1; 1A
50V) pour assurer la sécurité.
Camcorder
seulement
Chargeurdela
pile seulement
CAUTION
This symbol mark means following.
Forcontinuedprotectionagainstfirehaz-
ard, replace only with same type fuse.
(CP1;1.25A 24V, CP2; 1.25A 24V,CP3;
1.25A 24V, CP4; 0.5A 50V)
*Note: CP4 is except for VL-MC500K.
This symbol mark means following.
Forcontinuedprotectionagainstfirehaz-
ard, replace only with same type fuse.
(F1; 1A 50V)
Camcorder
only
Battery Charger
only

4
VL-MC500U/K
The RBRCTM Seal
SHARP participates in the RBRCTM* Nickel-Cadmium Battery Recycling Program in the United
States. The RBRCTM Seal on our battery pack contained in our product indicates that SHARP is
voluntarily participating in an industry program to collect and recycle these batteries. The RBRCTM
programprovidesyouwith a convenientalternativetoplacingspentNickel-Cadmiumbatterypacks into
the trash or municipal waste stream, which is illegal in some areas. At the end of their useful life, the
Nickel-Cadmiumbatterycanbedroppedoffatthenearestcollectioncenterforrecycling.Forinformation
onthenearestcollectioncenter,call1-800-8-BATTERYoryourlocalrecyclingcenter.Ifyouarelocated
outsidetheUnited States, contactyourlocalauthoritiesforinformation concerningproperdisposaland/
orrecyclingofthisbattery.SHARP’sinvolvementinthisprogramispartofourcommitmenttoprotecting
our environment and conserving natural resources.
[Footnote] *RBRCTM is trademark of the Rechargeable Battery Recycling Corporation.
The following program is available in the United States. Please consult local environmental
authorities concerning the availability of this or other programs in your area.
CAUTION
BEFORE BATTERY DESTROY
NICKEL-CADMIUM BATTERY
NICKEL-METAL HYDRIDE BATTERY
Battery disposal
Contains the above (Rechargeable) Battery. must be recycled or disposed of properly.
Remove the Battery from the products and contact Federal or State Environmental Agencies for
information on recycling and disposal options.
SEALED LEAD BATTERY
LITHIUM or LITHIUM-ION BATTERY

VL-MC500U/K
5
■PRECAUTIONS FOR USING LEAD-FREE SOLDER
1) Employing lead-free solder
"MainPWB","CameraheadPWB","AudioI/OPWB","CardPWB","InverterPWB","OperationPWB","DCJackPWB",
"CCD PWB" of this model employs lead-free solder. The LF symbol indicates lead-free solder, and is attached on the
PWBs and service manuals. The alphabetical character following LF shows the type of lead-free solder.
Example:
Indicates lead-free solder of tin, silver and copper
2) Using lead-free solder
When fixing the PWB soldered with the lead-free solder, apply lead-free wire solder. Repairing with conventional lead
wire solder may cause damage or accident due to cracks.
As the melting point of lead-free solder (Sn-Ag-Cu) is higher than the lead wire solder by 40°C, we recommend you to
use a dedicated soldering bit. If you are not familiar with how to obtain lead-free solder or soldering bit, contact our
service station or service ranch in your area.
3) Soldering
Asthemeltingpoint of lead-free solder(Sn-Ag-Cu)is220°Cwhich is higherthantheconventionalleadsolderby40°C,
and as it has poor solderability, you may be apt to keep the soldering bit in contact with the PWB for extended period
of time. However, since the land may be peeled off or the maximum heat-resistance temperature of parts may be
exceeded, remove the bit from the PWB as soon as you confirm the steady soldering condition.
Lead-free solder contains more tin, and the end of the soldering bit may be easily corroded. Make sure to turn on and
off the power of the bit as required.
Ifadifferenttypeofsolderstays onthetipof thesolderingbit,itisalloyedwithlead-freesolder.Cleanthebitafter every
use of it.
When the tip of the soldering bit is blackened during use, file it with steel wool or fine sandpaper.
Lead-free wire solder for servicing
Part No. ★Description Price Code
ZHNDAi123250E J φ0.3mm 250g(1roll) BL
ZHNDAi126500E J φ0.6mm 500g(1roll) BK
ZHNDAi12801KE J φ1.0mm 1kg(1roll) BM

6
VL-MC500U/K
Signal System: NTSC standard
Recording System: 2 rotary heads, helical scanning system
Cassette: Digital VCR Mini DV video cassette
Recording/Playback Time: 90 minutes (DVM60, LP mode)
Tape Speed: SP mode: 18.812 mm/second
LP mode: 12.555 mm/second
Pickup Device: 1/4" (6.4 mm, effective size: 4.5 mm) CCD image sensor
(with approx. 1,330,000 pixels including optical black)
Lens: 10 ×optical/300 ×digital power zoom lens (F1.8, f=3.6-36.0 mm), full-range auto
focus
Lens Filter Diameter: 30 mm
Monitor: 3" (7.5 cm) full-color LCD screen (TFT active matrix)
Microphone: Electret stereo microphone
Color Temperature Compensation: Auto white balance with white balance lock, outdoor or indoor
Minimum Illumination: 3 lux (15 lux measured by EIA standard)(with gain-up, F1.8)
Still Image Compression System: JPEG base line conformance
Still Image Recording Format: JPEG (Exif2.1)
Still Image Recording Medium: SD Memory Card, MultiMediaCard
Power Requirement: DC 7.4 V
Power Consumption: 5.0 W (during camera recording in Full Auto mode with zoom motor off and
backlight normal mode)
Operating Temperature: 32°F to 104°F (0°C to +40°C)
Operating Humidity: 30% to 80%
Storage Temperature: –4°F to 140°F (–20°C to +60°C)
Dimensions (approx.): 5 23/32" (W) ×3 7/16" (H) ×2 5/8" (D)
[145.0 mm (W) ×87.0 mm (H) ×66.6 mm (D)]
Weight (approx.): 1.12 lbs (508 g)(without battery pack, lithium battery, video cassette, lens cap,
lens hood and card)
2. SPECIFICATIONS
SERVICE INFORMATION (For the U.S.)
ForthelocationofthenearestSharpAuthorizedService,ortoobtainproductliterature,accessories,
supplies or customer assistance, please call 1-800-BE SHARP (1-800-237-4277) or visit SHARP's
website (http://www.sharp-usa.com)
Specifications are subject to change without notice.
AC Adapter
UADP-0339TAZZ(MC500U)
UADP-0341TAZZ(MC500K)
Power Requirement: AC 110-240 V, 50/60 Hz
DC Output: 10 V
Dimensions (approx.): 1 31/32" (W) ×1 1/16" (H) ×2 19/32" (D)
[50mm (W) ×27.0mm (H) ×65.5 mm (D)]
Weight (approx.): 0.22 lbs (100 g)

VL-MC500U/K
7
3. PART NAMES
For details on the use of each control.
Zoom lens
Cassette holder
Cassette compartment door
Cassette compartment door release
Flash
Speaker
Stereo microphone
Hand strap
Hand grip
Light adjustment sensor
Battery release
Battery mounting surface
Tripod adapter socket
Remote sensor
PHOTO button
Card slot cover
Start/Stop
button
DISPLAY button
Media Selection
switch ( Tape
mode/ Card
mode selection
switch)
Flash cover release
Card slot cover
release
USB terminal
DV terminal
AV terminal
Operation button
Terminal cover
Power Zoom Wide angle/
Telephoto control/
VOLume control
LCD monitor
Power switch ( Camera
Recording mode/
Playback mode select
switch)
Earphones jack

8
VL-MC500U/K
4. DISASSEMBLY OFTHE SET
Note:
Before removing the cabinet, turn off the power supply, and ascertain that the battery have been removed.
1. 3.
4.
2.
(d)
(d)
(d)
(c)
Battery Unit
(d)
(d)
Speaker Wire Connect
LCD Panel
FPC
(d) (d)
(d)
(d)
Tillt FPC
connector
FPC
Main PWB
Inverter PWB
(d)
(d)
(d)
1) Detach the battery unit.
2) Remove the three screws ((d)XiPSN17P03000).
3) Remove the one screw ((c)LX-HZ0050TAFN).
4) Detach the LCD cabinet in the direction of the arrow.
1) Remove the two screws ((d)XiPSN17P03000).
2) Disconnect the speaker wire connector.
3) Detach the side cover in the direction of the arrow.
1) RemovetheFPCoftheLCDpanel,anddetachtheLCDpanel
in the direction of the arrow.
1) Remove the four screws ((d)XiPSN17P03000), the tilt FPC
and the tilt wire connector to detach the lens section.
2) Remove the two screws ((d)XiPSN17P03000) to detach the
main PWB.
3) Removetheonescrew((d)XiPSN17P03000)andtheFPCto
detach the inverter PWB.

VL-MC500U/K
9
6.
7.
5.
(a)
(a)
(b)
(a)
(d)
(d)
(d) (d)
(d)
Battery Cover
(d)
(d)
(d)
(f)
(f)
(f)
(d)
(d)
(d)
(d)
(d)
Camera Rear Cabnet
Camera Front Cabnet
Lithium Battery Lid
(d)
(d)
Connect
Connect FPC
Connect
(d)
(d) (d)
1) Take out the mechanism in the direction of the arrow.
2) Remove the three floating screws ((a)LX-BZ0251TAFD) and the
one floating screw ((b)LX-BZ0253TAFN).
3) Removethefivescrews((d)XiPSN17P03000)todetachthebattery
cover.
1) Detach the lithium battery lid.
2) Turnthetiltsectioninthedirectionofthearrow,andremovethefive
screws ((d)XiPSN17P03000) and the three screws
((f)XiPSN17P04000) which fix the camera front cabinet. Then
detach the camera front cabinet in the direction of the arrow.
3) Remove the three screws ((d)XiPSN17P03000) fixing the camera
rear cabinet and the one screw ((d)XiPSN17P03000) fixing the
hand strap fitting.
4) Disconnectthemicrophonewireconnector,anddetachthecamera
rear cabinet in the direction of the arrow.
1) Remove the three screws ((d)XiPSN17P03000) to detach the
angle.
2) Remove the two screws ((d)XiPSN17P03000), the three connec-
tors and the two FPCs, and detach the tilt section in the direction
of the arrow.

10
VL-MC500U/K
5. MECHANISM ADJUSTMENT JIGS AND PARTS
5-1. Mechanism check adjustment jigs
50 or more
ø2No. 0 cross-bit
No. 00 cross-bit
Tolerance ±0.1
Tip thickness 0.5
1.4
3
2
* For Tu guide adjustment.
* For T roller adjustment.
* Bit shape (see figure below).
1. Torque screwdriver
150mN·m
2. JiGTD1500RTDH
3. CB
1. Master plane
2. 9EQMP-VLPD1
3. CL
* For checking reel base
height.
1. Height adjustment
screwdriver
2. 9EQDRiVER-DH5
3. BC
*
For guide roller adjustment.
1. Height adjustment jig
2. 9DAHG-PD1
3. BZ
* For height adjusting.
Fig. 2
Fig. 1 String
Weight Reel hub
String
<How to make jigs for mechanism checking and adjustment>
(1)Reel hub for back tension measurement (Fig. 1)
1) Obtain a commercially available cassette tape reel hub.
(Disassemble the cassette tape and remove the tape from
the reel hub.)
2) Paste one end of a string (about 20cm long) to the reel hub
with (for example) cellophane tape.
3) Paste the weight of about 0.21N on the upper side reel hub.
(2)String for use in pinch roller snap-fit force measurement (Fig. 2)
1) Obtainanapproximately20cmlengthofcommerciallyavailablestring.
2) Tie the 2 ends together to form a loop.
5-2. Parts for regular periodic inspection and maintenance
1. Oil
Cosmo Hydro HV22
2. 9EQ-Oil-HV22
3. AE
* Cosmo Petroleum K.K.
1. Cleaning paper
2. JiGDUSPER
3. AP
* DUSPER ∑(SIGMA)
(Ozu Co., LTD.)
1. Grease: Moly Coat
YM-103
2. 99FGREASE-YM103
* Dow corning
1. Screw lock (1401B)
* Three Bond
<Note: The entries of list>
Configuration
1. Name
2. Part No.
3. Code
* Model, Uses Remarks
1. Cleaning liquid:
Industrial-use ethyl alcohol
* Commercially available item
1. Extremely thin cotton swab
* Commercially available item
1. Alignment tape –( I)
2. VR3-GAZXS
3. CF
* For tape running
adjustment.
1. Alignment tape –( II )
2. VR3-GTZQS
3. CG
* For SW point adjustment.
*90ADVC-TAPEcanuse,
too.
<Miscellaneous>
(1) Slide caliper
(2) Precision screwdrivers
(Phillips head and slotted)
(3) Radio needle-nose pliers
(4) Tweezers
1. For hexagon nut
opposite side 3mm bit.
2. 95CM22001
3. BL
* For S guide hexagon
nut installation.
<Note:
The entries of list>
Configuration
1. Name
2. Part No.
3. Code
* Model, Uses Remarks
1. PB-use cassette
Torque meter
2. 9DASD-1015
3. DB
* 1mN·m/1.5mN·m
1. Torque gauge
2. JiGTG0045
3. CN
*
For use in VS-REW wind-
ing torque measurement.
1. Torque gauge head
2. 9EQTGH-DH5000
3. BW
* For use with the torque
gauge listed left.
1. Tension gauge 4N
2. JiGSG0400
3. BK
* For measurement of
pinch roller pressure.
1. Dial tension gauge
2. 9DAPTG-10-10W
3. CA
* PTG-10

VL-MC500U/K
11
6. INSPECTION AND MAINTENANCE ITEMS AND INTERVALS
Inordertokeepthemechanicalsectionalwaysingoodcondition,performthefollowinginspectionandmaintenanceatregularintervals.
In addition, after repair, perform the following maintenance items regardless of how long the user has been using the unit.
6-1. List of inspection and maintenance items
Inspection and Time of use (h) Symptoms that indicate Remarks
maintenance location 500 1,000 1,500 2,000 3,000 need for maintenance
Tape running section (see section 8-3)
Drum section, Video head
(see section 8-3)
•Block-type noise
•Head hole clogging
•Tape damage
<Rollers>
•Replace if there is anything abnormal in the rotation, or if there is run-out
(that becomes large).
<Other than the above>
•Clean the section that contacts the tape (especially the lower drum helical
section). Use the specified cleaning liquid. •The tape fails to run.
•The tape becomes slack.
•Block-type noise
•Abnormal noise
Timing belt
Pinch roller
Capstan motor
•Replace if there is anything
abnormal.
Swing arm
S reel base, Tu reel base
Center pulley shaft
Intermediate pulley shaft
Swing arm boss
Intermediate gear A shaft,
Intermediate gear B shaft
Tape running system
•••Replace. •••Clean. •••Lubricate. •••Check.
Note:
Replace the drum ass'y if the
video head is cleaned but the
envelope still does not appear.
(When the envelope is normal,
refer to "11. USEFUL TIPS".)
•Lubricate with oil.
[Oil]
Cosmo Hydro HV22
Note: Apply oil to the shaft, then
wipe lightly with a cloth.
•Abnormal noise
Loading motor
Mode switch •Cannot eject. •Fails to enter a mode.
•The tape fails to run.
•The tape becomes slack.
•Tape damage
•The play-back image is
abnormal.
Abnormal noise
PB ·VS/R winding torque
PB ·VS/R ·loading back tension
Tu reel base ratchet torque
S reel base no-load torque
•Replace any part that fails to
perform within the standard.
•Replace if anything is abnormal
(including the noise).
Performance checks
[Oil] Cosmo Hydro HV22
[Grease] Moly Coat YM-103 [Screw lock] Three Bond 1401B
[Cleaning liquid] Industrial-use ethyl alcohol
Drive system
6-2. Precautions
(1)When replacing any part, always replace the cut washer that was
removed with a new one.
(2)This mechanism does not have control adjustment. If the control
cannot be set as required, clean and or replace parts.
(3)On the oil
a) Always use the specified oil. (Using another kind of oil can cause
various kinds of trouble.)
b) Alwaysusecleanoil,withoutanymixed-indirt,tolubricatebearings.
(Using oil with dirt mixed in can cause the bearings to wear or to
stick.)
c) One drop of oil is the amount shown in the Fig. 1, on the point of a
pin.
(4)Perform circuit repair, tape running adjustment, etc. with the cassette
controller assembly attached to the mechanism.
(5)When operating the mechanism separately, apply voltage to the
loading motor. However, the terminal voltage must be DC3V~4V.
(When the mechanism is connected to the main PWB, do not apply
external voltage to the loading motor. It may cause a trouble.)
(Forcing the gears to turn by hand entails danger of breakage.)
Ifthemechanismisseparatedfromtheunit,thecapstanmotormayrub
and be damaged if spacing under the mechanism is inadequate.
(6)To install the cassette controller, push section A in the Fig. 2. Do not
push anything else.
(7)Do not deform any of the mechanical parts.
Oil
1.5mm diameter or less
Fig. 1
Fig. 2

12
VL-MC500U/K
7. MECHANICAL ADJUSTMENTS AND CHECKS
The items discussed here relate to general on-site servicing (field servicing). Adjustments and replacements that require
sophisticated facilities, jigs and technology are omitted.
Inaddition,inordertomaintainthecharacteristicsthatthe unithaswhenitisnew,notonlyareinspectionandmaintenancenecessary,
but it is absolutely necessary that, for example, the tape not be damaged, and always use jigs for adjustments that require them.
<Precautions>
(1)Always set the power supply and state of the unit as follows Notes for mechanism adjustments and checks.
AC adapter used, with cassette controller assembly
AC adapter used, without cassette controller assembly (Independent Mechanism)
DC3V, without cassette controller assembly (Independent Mechanism)
(2) Whenthe mechanismis connectedto themain PWB,do notapply externalvoltage tothe loadingmotor. Itmay causea trouble.
(3) Always run the tape with the cassette controller assembly attached.
7-1. Checking the playback (recording) winding torque AC adapter used, with cassette controller assembly
(1)Set the torque cassette with the cassette controller assembly attached, then, in SP recording mode (playback mode if a signal has
already been recorded in SP mode on the tape), confirm that the torque on the winding side is within the standard.
<Winding torque standard in record (playback) mode>
(If there is torque ripple, read the center value.)
0.70 +0.4/-0.3mN·m, ripple 0.4mN·m or less
7-2. Checking the rewinding playback (VS-REW) winding torque
AC adapter used, without cassette controller assembly (Independent Mechanism)
(1)Remove the cassette controller assembly, press the DOWN switch, using the
adhesive tape and referring to 9-3, operate in the TEST mode (T01) to rewind,
and set the rewinding playback (VS-REW) mode.
(2)Set the torque gauge on the S reel base, press the front end of tension post with
your finger in the arrow A direction so as to ascertain that the winding torque is
as specified. (Check without rotating the torque gauge.)
<Rewinding playback (VS-REW) winding torque standard>
(If torque ripple exists, read its center value.)
1.6 ±0.6mN·m, ripple 0.5mN·m or less
(3)After checking the winding torque remove the torque gauge, and remove the
adhesive tape used in item (1) above (refer to 9-3). The STANDBY mode is set
automatically.
7-3. Checking of reel base height DC3V, without cassette controller assembly (Independent Mechanism)
(1)Remove the cassette controller assembly (refer to 9-2).
(2)Referring to 9-1, apply DC3V to the loading motor and put the system into playback mode.
(3)Taking adequate care so that the master plane does not contact drum, running parts (guide roller, etc.), or the MIC contacts. Fit
the master plane holes to the 2 guides (A and B) in Fig. 2.
(4)Confirmthatthe heightsoftheSreelbasereelreceivingsurfaceandtheTureel basereelreceivingsurfacebelowthemasterplane
top surface are within the set values, using, for example, a slide calliper (Fig. 3).
When checking the S reel base height, press the front end of tension post in the arrow A direction with your finger to release the
tension band, and then check the height in this state (Fig. 1).
(5)If the height is not within set values, replace the washer under the reel base, and adjust as specified.
Note: After the adjustment, make sure that the reel bases rotate smoothly.
2.4 ±0.1
Reel base height
setting values
Fig. 1. Removal of tension band when
measuring the rewinding play-
back (VS-REW) winding torque
Fig. 3 Fig. 2
2.4 ±0.1
Reel base height
setting values
Reel receiving
surfaces
AB
MIC contacts

VL-MC500U/K
13
7-4. Back tension torque check and adjustment in record (playback) mode
AC adapter used, with cassette controller assembly
(1)Checking
Set the torque cassette (SD-1015), and make sure in the SP record mode that
the supply side torque is within the standard shown below (or in the playback
mode for the tape on which the signal has been SP-recorded).
<Standard>
(If torque ripple exists, read its center value.)
0.7 ±0.1mN·m
(2)Adjustment (Fig. 4)
If the value is out of standard range, adjust, using the screw 1 shown in Fig. 4.
1. Loosen the screw 2 slightly.
2. Adjust to turning the screw 1. When back tension is too high, turn the screw
1 counterclockwise (CCW).
When back tension is too low, turn the screw 1 clockwise (CW).
3. After adjustment fix the angle with the screw 2. (At this time take care so as
to prevent excessive tightening.) Apply Screw Lock to the screw 1.
<Caution>
Screw tightening torque: 0.04N·m
7-5. Checking and adjustment of tension roller position in
record (playback) mode
DC3V, without cassette controller assembly (Independent Mechanism)
(1)Checking
Before winding the 60-min tape make sure that the tension roller is in the same
position as S guide as shown in Fig. 4.
If not, take out the tape and adjust in the following procedure.
(2)Adjustment (Fig. 5)
1. Set the playback mode without loading the tape.
2. Loosen the screw 3 slightly (to such an extent that the tension band holder
4 can be moved).
3. If the tension roller is inside from the specified position, shift the tension
band holder 4 in the arrow Adirection. If the tension roller is outside, shift
the tension band holder in the arrow Bdirection, and fix with the screw 3.
(Proper shift must be 0.2 to 0.6mm outside from the specified position.)
4. Check the position by the procedure described in item (1) Checking above.
5. If the position is not specified position, adjust again.
7-6. Checking of supply S reel base no-load torque
DC3V, without cassette controller assembly (Independent Mechanism)
(1)Remove the cassette controller assembly, then apply DC3V to the loading
motor and put the system into L. start mode (refer to 9-1).
(2)Move the swing arm toward the Tu reel base side.
Be careful not to cause damage to the gears and other parts in the process.
(Fig. 6)
(3)Set a back tension measurement reel hub on the S reel base.
(4)Usinga dialtension gauge,pull thestring intheAdirection,then confirmthat the
tension is within the standard.
<FF back tension standard>
(If the tension fluctuates, read its center value.)
30mN or less
7-7. Checking of loading back tension
DC3V, without cassette controller assembly (Independent Mechanism)
(1)Remove the cassette controller assembly, then apply DC3V to the loading
motor and put the system into L. start mode. (refer to 9-1)
(2)Move the swing arm toward the S reel base side. Be careful not to cause
damage to the gears and other parts in the process. (Fig. 7)
(3)Set a back tension measurement reel hub on the Tu reel base.
(4)Usinga dialtension gauge,pullthe stringin theA direction,then confirm that
the tension is within the standard.
Fig. 5. Position adjustment
(tape does not exist)
Fig. 6. S reel base no-load torque
measurement method
A
Fig. 4. Check (tape exists)
Tension roller position (S guide standard)
0 ±0.3
Screw2
Screw1
CCW
CW
Apply screwlock
Tension roller position (S guide standard)
0.2~0.6mm (Standard)
Tension roller S guide
Tension band holder 4
Screw 3
Movethe swingarm
toward the Tu reel
base side.

14
VL-MC500U/K
A
Fig. 7. Loading back tension measurement
method
Fig. 8. Winding Tu reel base ratchet torque
measurement method
Fig. 11
OK NG
A
Fig. 10
Fig. 9
<REW back tension standard>
(If the tension fluctuates, read its center value.)
15 ±12mN
7-8. Checking of winding Tu reel base ratchet torque
DC3V, without cassette controller assembly (Independent Mechanism)
(1)Remove the cassette controller assembly, then apply DC3V to the loading
motor and put the system into standby mode. (refer to 9-1)
(2)Move the swing arm toward the S reel base side.
Be careful not to cause damage to the gears and other parts in the process.
(Fig. 8)
(3)Set a back tension measurement reel hub on the Tu reel base.
(4)Using adial tension gauge,pull thestring inthe Adirection, then confirmthat
the tension is within the standard.
<Winding Tu reel base ratchet torque standard >
(If the tension fluctuates, read its center value.)
100mN or less
7-9. Checking of rewinding playback (VS-REW) back
tension
DC3V, without cassette controller assembly (Independent Mechanism)
(1)Remove the cassette controller assembly, then apply DC3V to the loading
motorandput thesystem intorewindingplayback (VS-REW) mode.(referto
9-1)
(2)Move the swing arm toward the S reel base side.
Be careful not to cause damage to the gears and other parts in the process.
(3)Set a torque gauge on the Tu reel base.
(4)Turning the torque gauge to counterclockwise (1 turn for 3 seconds), then
confirm that the torque is within the standard.
<Rewinding playback (VS-REW) back tension standard value>
(If the tension fluctuates, read its center value.)
0.70 +0.6/-0.3mN·m
7-10.Checking of pinch pressing force
DC3V, without cassette controller assembly (Independent Mechanism)
(1)Set the pinch roller pressing force measuring thread on the pinch lever
(position A , Fig. 9).
(2)Set the mechanism to the playback mode, press the pinch roller against the
capstan shaft.
(3)Fit thetensiongaugeto thepinchrollerpressing forcemeasuringthread,pull
inthearrowBdirectionshowninFig.11toseparatealittlethepinchrollerfrom
the capstan shaft.
(4)Gradually return the pinch roller, and when the pinch roller contacts parallel
the capstan shaft, read the value (see Fig. 10) to make sure that the value
conforms to the standard shown below.
<Standard>
1.8 +0.3/-0.5N
<Caution>
After making this measurement, quickly release the system from playback
mode and remove the pinch roller from the capstan shaft. (If the pinch roller
is left fitted onto the capstan shaft for a long time, the pinch roller will be
deformed.)
A
Movetheswingarm
toward the S reel
base side.
Movetheswingarm
toward the S reel
base side.
Capstan shaft
Pinch roller
B
Right guide

VL-MC500U/K
15
8. TAPE RUNNING ADJUSTMENT
8-1. Adjustment locations
8-3. Preparation for tape running adjustment
Meters, jig…Oscilloscope, Adjustment remote control, Height adjustment screw driver, Alignment tape (for tape running
adjustment, for switch point adjustment), Master plane, Height adjustment jig.
<Method and description>
(1)Clean the tape running surface (especially, adequately clean
the drum surface and the lower drum helicam surface).
(2)Attach the cassette controller.
(3)Connect an oscilloscope to each TP on the relay circuit board.
(4)Turn the AC adapter power ON.
(5)Using the adjustment remote control unit, put the system TEST
mode T-05.
(6)Replay the alignment tape for running adjustment, and make
sure that the tape is running in the SP mode.
(7)Check the oscilloscope playback envelope, then, at +1/4 shift
and -1/4 shift, check whether all of it is flat. If it is not, perform
the following adjustment so that it becomes flat.
(Each time you push the PLAY key, the shift will change;
+1/4 shift → Normal → -1/4 shift → Normal , in order.)
8-2. Running height adjustment
·After replacement of T roller or Tu guide adjust the height . (Adjust only the replaced parts.)
·After height adjustment do not turn the T roller. If crease is found on the tape of Tu guide, remove the crease by rotating.
(As for details refer to the “Running rough adjustment”.)
·After height adjustment of T roller or Tu guide, apply Screw lock to an end of shaft.
(After replacement of S guide apply Screw lock to same point, too.)
S guide
Reels
Tension roller Drum
Tu guide roller
Sup guide roller
Pinch roller
Tu guide
Fit height the par on low edge fitting.
After setting adjustment jigs, turn T roller
counterclockwise to 315°.
Lower edge
fitting
Height setting
jig
Master plane
Running adjustm-
ent preparation
Adjustment
procedure 8-3
<Replacement parts>
·T roller, arm
·Tu guide, arm
·Slide chassis
Adjust the height of only
replaced parts with the
adjusting jig.
Adjustment procedure 8-2
<Replacement parts other
than those shown above>
·S guide
·Pole base
·Guide roller
·Drum assembly
·Capstan motor, etc.
Height presetting is not
necessary.
Cassette controller
installation
Running rough
adjustment
Adjustment
procedure 8-4
Running final
adjustment
Adjustment
procedure 8-5
Tu guide T roller
Height setting
jig Height setting
jig
Master plane
Master plane

16
VL-MC500U/K
<Method and description>
(1)Check that the tape is not distorted between the Tu guide and
pinch in the PB mode and the V/SR mode.
-If crease is found, make an adjustment in the range of ±180°.
-After adjustment apply Screw Lock.
<Method and description>
(1)Confirm that the envelope waveform peaks in V/SR mode are
uniform.
(2)If they are not uniform, fine-adjust the guide roller and the Tu
guide.
<Method and description>
(1)Loosen the guide roller lock screw, then tighten loosely so that
the roller turns easily.
(2)Replay an alignment tape, and adjust the Sup, Tu guide roller
so that the envelope sides of entrance and exit are flat.
(3)Perform ±1/4 shift, then, as in the above case, adjust until the
envelope becomes flat.
* If running is difficult for the entrance changed, turn the T roller
to counterclockwise 180°. (refer to Fig. 1)
8-4. Running rough adjustment
(With cassette controller)
<Method and description>
(1)Perform ±1/4 shift, then if the envelope wave's ratio of MAX.
to MIN. are 60% or less, adjust again the height of guide roller.
(Refer to Fig. 2)
(2)Finally adjust the lock screw of Sup and Tu guide roller.
(3)Once perform unloading and then loading to set the PB mode,
and make sure that the envelope waveform does not change.
1) Adjustment of Sup and Tu guide roller height
8-5. Final running adjustment
(With cassette controller)
2) Adjustment of playback SWP
<Method and description>
(1)Playback the alignment tape for switch point adjustment.
(2)Perform SWP automatic adjustment with adjustment remote control.
Fig. 2
* When replacing the mechanism and drum, adjust the phase and equalizer using the adjustment remote control.
(Refer to "10. ADJUSTING THE ELECTRICAL CIRCUITS".)
1) Su, Tu guide roller height adjustment Entrance side Exit side
Normal
NG NG
Turn to 180°
T roller
Fig. 1
2) Check of V/SR envelope wave form
B
A
•
•
Adjust so that A B.
3) Check of tape wrinkles Tu guide
Deformation
Deformation
Wrinkles
Pinch roller
4) Check the rising time of the envelope wave form
<Method and description>
(1)Check the rising time of the envelope when switching from V/SR mode to PB mode. (Within 5 sec)
(2)Check the rising time of the envelope when switching from STOP mode to PB mode. (Within 5 sec)
±1/4 shift ±1/4 shift

VL-MC500U/K
17
9. MECHANICAL SECTION ASSEMBLY AND PARTS REPLACEMENT
(DISASSEMBLY AND REASSEMBLY)
Mechanical section disassembly and reassembly are explained in this section.
For removal of the cabinet, etc., refer to 4. DISASSEMBLY OF THE SET.
<Precautions>
1. Always replace cut washers that have been removed, for example in parts replacement, with new ones.
2.
When reassembling, be careful not to allow screws, washers or foreign matter to enter. They can cause mechanical misoperation.
3. Use the cleaning liquid, oil, grease and screw lock that are specified below. Use of any other kind can cause mechanical
misoperation.
Oil: Cosmo Petroleum : Cosmo Hydro HV22 Screw lock: Three Bond :1401B
Grease: Dow Corning : Moly Coat YM-103 Cleaning liquid: Industrial-use ethyl alcohol
9-1. On the mechanical modes
When operating the mechanism separately, apply DC3~4V to the loading motor.
(WhenthemechanismisconnectedtothemainPWB,donotapplyexternalvoltagetotheloadingmotor.Itmaycauseoperationalproblems.)
(1)EJECT mode
The mechanism position to take out the cassette where the
EJECT lever is extremely shifted in the A direction. (It is
impossible to lock the cassette controller assembly in this
mode.)
(2)STANDBY mode
The mechanism position to set the cassette where the slide
chassis is at the farthest position from the drum and the
EJECT lever is in counterclockwise rotated position (position
where the cassette controller assembly can be locked).
LOADING START mode diagram REWINDING (VSR) mode diagram
A
EJECT lever
EJECT lever
Rotation
(3)LOADING START mode
This is the mode where the tape is wound around the winding
reel when a cassette with visible wind start leader tape is
loaded. (The brake shifter moves to the left, the S main brake
is separated from the S reel base and the Tu main brake is
separated from the Tu reel base.)
(4)REWINDING (VSR) mode
The mechanism position to rewind the tape (fast rewinding
playback). The S and T pole base is pressed, the pinch roller
is pressed to the capstan shaft, the brake shifter VSR brake
section engages with the Tu reel base gear.
EJECT mode diagram STANDBY mode diagram
S reel base
S main brake Brake shifter Tu main brake
Tu reel base
VSR brake section
Tu reel base
Capstan shaft
Pinch roller
T pole base
S pole base
Slide chassis
Itishardlyseensince
it is concealed with
slide chassis.

18
VL-MC500U/K
PLAYBACK mode diagram
(RECORD, FF, VSF)
(5)PLAYBACK (RECORD, FF, VSF) mode
The mechanism position for playback, record, FF and fast
feed playback.
The pinch roller is pressed to the capstan shaft, and the S/Tu
main brake is separated from the S/Tu reel base.
(6)STOP mode
The system is in the STOP (Rec Lock in CAMERA mode)
position;theSandtheTpolebasesaresnap-fittedtothedrum
base,theSbrakeisincontactwiththeSreelbase,and theTu
brake is in contact with the Tu reel base.
STOP mode diagram
S main brake
S reel base Tu reel base
Tu main brake
(Not visible)
Capstan shaft
Pinch roller
S reel base
S main brake Tu main brake
Tu reel base
T pole base
S pole base
Fig. 1. Fig. 2.
Fig. 3. Fig. 4.
Fig. 5. Fig. 6.
9-2. Cassette controller assembly
<Removing>
(1) Apply DC3V to the loading motor to enter the standby mode.
Press the lock lever in the arrow direction to raise the cassette controller. (See Fig. 1;
A
or Bdirection.)
(2) Turn the damper lever in the arrow Cdirection to release the engagement of the damper bar. (See Fig. 2.)
(3) Remove two screws E, and remove the down guide Din the arrow Fdirection. (See Figs. 3 and 4.)
Take care that the slide chassis is provided with the down guide positioning
G
or H.
(4)Slide the cassettecontroller in thearrow Idirection, removethe outer linkshaft (both sides)toward the insideof themechanism,
and turn the cassette controller in the arrow Jdirection. (See Fig. 5.)
(5) Slide the cassette controller in the arrow Kdirection. (See Fig. 6.)
<Installing>
(1) Apply DC3V to the loading motor to enter the standby mode.
(2) For assembly, reverse the removing procedure (5) thru (2).
Tightening torque of two screws E: 40±4mN.m

VL-MC500U/K
19
9-3. How to operate with the circuit board without the cassette controller assembly.
Inthismethod,iftheprocedureisfollowedincorrectlythereisdangerofdamagingthemechanismand thetape,soexceptinspecial
cases,suchaswhenmeasuringtheVSRtorque,donotperformthisprocedure.Normallyoperatethisunitwiththecassettecontroller
assembly attached.
Be sure to follow each caution mentioned.
Phase matching hole
(for chassis)
Main cam Coupling
gear
Phase matching
mark
Fig. 8
Fig. 9
Mode switch
Sub cam
(1) Apply DC3 ~ 4V to the loading motor to enter the standby mode.
(2) Securely press the movable piece Lof the down SW with
cellophane tape or similar to turn on SW. (Take care that the
movable piece turns only in the shown arrow direction.)
Note:ToenterRECmode,pressthepinoftherecognitionswitch M.
(Unnecessary in other modes.)
(3) Set the test mode (T-01) with the adjustment remote controller
without putting the tape, and the mechanical operation will
become possible with the mode key.
(4) For ejection, remove the tape of (2).
Fig. 7. LOADING START mode
Rotarydi-
rection of
movable
piece
Movable piece
of down SW.
Side view
9-4. Phase matching
Referring to Figs. 8 and 9, align the phase for the following parts.
(1) Eject lever (2) Eject control lever (3) Mode SW (4) Main cam (5) Sub cam
Note: Before disassembly, sufficiently check the marker position.
Note: When installing the joining gears, verify that the phase matching holes of the main cam and subcam are aligned to the hole of
the chassis.
Note: After the phase is aligned, turn the mode SW with hand, and verify that it turns nearly one turn.
(After verification, return it to the original position.)
Phase matching hole
(for chassis)
Eject lever
Phase matching hole
(for gear)
Eject
control lever
Phase matching hole
(for chassis)

20
VL-MC500U/K
9-5. Reassembly
9-5-1. Reassembly in side of the main chassis.
Note) Numbers before part names are given as a guide to the order of assembly.
As for greasing/oiling/cleaning places refer to the attached drawings (Grease/Oil application side of the main chassis).
1. 4.
5.
2.
Item Tightening torque Quantity
A S Tight ·M1.4 x L3 70mN·m3
Item Tightening torque Quantity
BCWø1.2-ø3.0-t0.25 1
3.
Item Tightening torque Quantity
C Special screw ·40mN·m2
M1.4 x L1.6
D
Special screw with step ·70mN·m1
M1.4 x L6.25
Item Tightening torque Quantity
C Special screw ·40mN·m1
M1.4 x L1.6
E S Tight ·M1.4 x L4 70mN·m2
F S Tight ·M1.4 x L2 70mN·m1
6.
Item Tightening torque Quantity
G Special head screw · 40mN·m2
M1.4 x L1.5
Item Tightening torque Quantity
HCWø0.7-ø2.2-t0.25 2
I Special screw ·5mN·m2
M1.2 x L1.8
(Tentative tightening)
303
361
301
465
463
A-1
A-2
A-3
Groove grease Pinch drive lever
Pinch control lever
Main chassis Ass'y(Front surface)
LM/Mode FPC
Mode SW
360
302
304
370
369
305
B
371
Main cam
Cam groove grease
Coupling
gear
EJECT lever
EJECT control lever AHC cam
Sub cam
Shifter drive lever Ass'y
386
462
461
309
306
C
C
D
T arm control lever
Loading motor Ass'y
Groove grease Capstan motor
Loading motor
fitting Ass'y
Slide chassis
guide
Loading lever
Groove grease
367
315
363
366
311
312 364 365
421
459
C
F
E
E
T arm control
lever stopper
H/A PWB angle
Center pulley
Ass'y Drive belt
Intermediate gear angle
sub Ass'y
Intermediate gear
stopper
Intermediate pulley
Ass'y
Capstan FPC stopper
G
G
Phase match check
Enter part of
convexity rear
surfacer
Guide rail sub Ass'y
Phase match check
Guide rail sub Ass'y
(Rear surface)
396
308
362
373
454
451
307
395
372
452
I
I
H
H
Guide roller Ass'y
Sup pole base Ass'y
Tu pole base
Ass'y
S loading arm
Ass'y
S pressure spring
S loading gear
Tu loading gear
Tu pressure spring
Tu loading arm Ass'y
Guide rail