Sharp VC-S101U User manual

1
VC-S101U
SERVICEMANUAL
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
SHARP CORPORATION
VIDEO CASSETTE RECORDER
VC-S101U
In the interests of user-safety (Required by safety regulations in some
countries) the set should be restored to its original condition and only parts
identical to those specified should be used.
MODEL
CONTENTS
Page
1. GENERAL INFORMATION .............................. 5
1-1 FEATURES .................................................5
1-2 SPECIFICATIONS ..................................... 5
1-3 LOCATION OF MAJOR COMPONENTS
AND CONTROL ......................................... 6
2. DISASSEMBLY AND REASSEMBLY .............. 7
2-1 DISASSEMBLY OF MAJOR BLOCKS....... 7
2-2 DISASSEMBLY OF MECHANISM
AND MAIN PWB ASSEMBLY .................... 8
2-3 CARES WHEN REASSEMBLING.............. 9
3. FUNCTION OF MAJOR MECHANICAL PARTS
TOP VIEW.......................................................10
BOTTOM VIEW...............................................11
4. ADJUSTMENT, REPLACEMENT AND
ASSEMBLY OF MECHANICAL UNITS.......... 12
5. ELECTRICAL ADJUSTMENT........................ 31
5-1 ADJUSTMENT OF HEAD SWITCHING
POINT .......................................................32
5-2 ADJUSTMENT OF SLOW TRACKING
PRESET....................................................32
5-3 ADJUSTMENT OF FV (False Vertical
Sync) OF STILL PICTURE ...................... 32
5-4 CHECKING OF OFF TRACK................ 33
5-5 CHECKING OF E-E LEVEL................... 33
5-6 ADJUSTMENT OF VCO .......................... 33
5-7 CHECKING OF SUB EMPHASIS LEVEL 33
Page
5-8 S-VHS / S-VHS ET / VHS WHITE
CLIP LEVEL ADJUSTMENT ................... 34
5-9 S-VHS / S-VHS ET / VHS FM CARRIER/
DEVIATION ADJUSTMENT..................... 34
5-10 S-VHS / S-VHS ET / VHS REC CHROMA
CURRENT ADJUSTMENT....................... 35
5-11 S-VHS / S-VHS ET / VHS REC FM
CURRENT ADJUSTMENT....................... 35
5-12 S-VHS / S-VHS ET / VHS PLAYBACK
LEVEL ADJUSTMENT............................. 36
5-13 ADJUSTMENT OF SIF-INPUT LEVEL .... 36
5-14 ADJUSTMENT OF FILTER...................... 36
5-15 ADJUSTMENT OF STEREO VCO........... 37
5-16 ADJUSTMENT OF STEREO
SEPARATION ...........................................37
6. MECHANISM OPERATION FLOWCHART
AND TROUBLESHOOTING GUIDE .............. 38
7. TROUBLESHOOTING ................................... 44
8. BLOCK DIAGRAM ..........................................58
9. CIRCUIT DIAGRAM AND PWB FOIL
PATTERN .......................................................66
10.REPLACEMENT PARTS LIST....................... 91
11.EXPLODED VIEWS ..................................... 105
12.PACKING OF THE SET ............................... 109
S69I8VC-S101U

VC-S101U
2
part.Any reading of 0.45V rms (thiscorrespondsto0.3mArms
AC.) or more is excessive and indicates a potential shock
hazard which must be corrected before returning the video
cassette recorder to the owner.
IMPORTANT SERVICE NOTES
WARNING :TO REDUCE THE RISK OF FIRE OR ELEC-
TRIC SHOCK, DO NOT EXPOSE THIS AP-
PLIANCE TO RAIN OR MOISTURE.
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK. DO NOT
REMOVE COVER. NO USER-SERVICEABLE PARTS IN-
SIDE. REFER SERVICING TO QUALIFIED SERVICE PER-
SONNEL.
This symbol warns the user of uninsulated voltage
withintheunitthatcancausedangerouselectricshocks.
This symbol alerts the user that there are important
operatingandmaintenanceinstructionsintheliterature
accompanying this unit.
This symbol mark means fast operating fuse.
For continued protection against risk of fire, replace
only with same type fuse F901 (3A, 125V).
CAUTION:
BEFORE RETURNING THE VIDEO CASSETTE
RECORDER
Before returning the video cassette recorder to the user, perform
the following safety checks.
1. Inspectallleaddresstomakecertainthatleadsarenotpinched
or that hardware is not lodged between the chassis and other
metal parts in the video cassette recorder.
2. Inspect all protective devices such as non-metallic control
knobs, insulation materials, cabinet backs, adjustment and
compartment covers or shields, isolation resistor/capacitor
networks, mechanical insulators etc.
3. Tobe sure that no shockhazardexists,check for 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).
●Using two clip leads, connect a 1.5k ohm, 10 watt resistor
paralleled by a 0.15µF capacitor in series with all exposed
metalcabinetpartsand aknownearth ground,suchasawater
pipe or conduit.
●Use an SSVM or VOM with 1000 ohm per volt, or higher,
sensitivity or measure the AC voltage drop across the resisor
(See Diagram).
●Move the resistor connection to earth exposed metal part
having a return path to the chassis (antenna, metal cabinet,
screw heads, knobs and control shafts, etc.) and measure the
AC voltage drop across the resistor. Reverse the AC plug on
thesetandrepeatACvoltagemeasurementsforeachexposed
SSVM
AC SCALE
1.5k ohms.
10W
CONNECT TO
KNOWN EARTH
GROUND
TO EXPOSED
METAL PARTS
0.15 µF
TEST PROBE
3A 125V

3
VC-S101U
entrelarésistance.InverserlaficheCA(uneficheintermédiaire
non polarisée doit être utilisée à seule fin de faire ces
vérifications.) sur l’appareil et répéter les mesures de tension
CA pour chaque piéce métallique exposée. Toute lecture de
0,45 Vrms (ceci correspond à 0,3 mArms CA) ou plus est
excessive et signale un danger de choc qui doit être corrigé
avant de rendre le magnétoscope à son utilisateur.
NOTES DE SERVICE IMPORTANTES
ATTENTION: POUR REDUIRE LES RESQUES D'IN-
CENDIE OU DE CHOC ELECTRIQUE,
NE PAS EXPOSER CET APPAREIL A
LA PLUIE OU A L'HUMIDITE.
AVANT DE RENDRE LE MAGNETOSCOPE
Avant de rendre le magnétoscope à l’utilisateur, effectuer les
vérifications de sécurité suivantes.
1. Vérifiertoutes les gaines de fil pourêtre sûr que les fils nesont
paspincés ou que le matériel n’est pas coincé entre le châssis
et les autres pièces métalliques dans le magnétoscope.
2. Vérifiertouslesdispositifsdeprotectiontelsquelesboutonsde
commande non métalliques, les matériaux d’isolement, le dos
ducoffret,lescouverclesdecompartimentetajustementoules
boucliers,lesréseauxderésistance/condensateurd’isolement,
Ies isolateurs mécaniques, etc.
3. Pourêtresûrqu’iln’yaaucunrisquedechocélectrique,vérifier
le courant de fuite de la maniére suivante.
●Brancher le cordon d’alimentation secteur directement dans
une prise de courant de 120 volts. (Ne pas utiliser de
transformateur d’isolement pour cet essai).
●Utiliser deux fils à pinces et connecter une résistance de 10
watts 1,5 kohm en parallèle avec un condensateur de 0,15 µF
ensérieavecdespiècesducoffretmétalliqueexposéesetune
masse de terre connue telle qu’un tuyau ou un conduit d’eau.
●Utiliser un VTVM ou VOM avec une sensibilité de 1000 ohms
par volt ou plus ou mesurer la chute de tension CA entre la
résistance (voir diagramme).
●Déposer la connexion de la résistance à toutes les pièces
métalliques exposées ayant un parcours de retour au châssis
(connexionsd’antenne,coffretmétallique,tétesdevis,boutons
etarbresdecommande,etc.)etmesurerlachutedetensionCA
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR
ATTENTION
Ce symbole avertit l'utilisateur que des instructions
importantesrelativesàl'utilisationetàl'entretiensetrouvent
dans le manuel accompagnant l'appareil.
ATTENTION: AFINDEREDUIRELESRISQUESDECHOCELECTRI-
QUE, NE PAS RETIRER LE COUVERCLE, AUCUN
ORGANE INTERNE NE PEUT ETRE REPARE PAR
L'UTILISATEUR. CONFIER L'APPAREIL A UN
DEPANNEUR QUALIFIE.
Ce symbole signale à l'utilisateur la présence d'une
tensionnonisoléeàl'intérieurdel'appareilquipeutêtrela
cause de secousses électriques dangereuses.
PRECAUTION:
Cette marque indique le fusible à action in stantansée.
Pourla protection continue contre le risqued'incendie,ne
remplacer que par le fusible type F901 (3A, 125V).
0,15 µF
SONDE D'ESSAI
VERS PIECES
METALLIQUES
EXPOSEES
VTVM
ECHELLE CA
1.5 KOHMS
10W
CANNECTER A
UNE MASSE DE
TERRE CONNUE
3A 125V

VC-S101U
4
PRECAUTIONS IN PART REPLACEMENT
When servicing the unit with power on, be careful to the section marked white all over.
This is the primary power circuit which is live.
Whencheckingthe solderingsidein thetape travelmode,make surefirst thatthetapehas beenloadedand thenturn
over the PWB with due care to the primary power circuit.
Makereadjustment,ifneededafterreplacementofpart,withthemechanismanditsPWBinpositioninthemainframe.
(1) Start and end sensors: Q701 and Q702
Insert the sensor’s projection deep into the upper hole of the holder. Referring to the PWB, fix the sensors tight
enough.
(2) Photocoupler: IC901
Refer to the symbol on the PWB and the anode marking of the part.
(3) Cam switches A and B: D708 and D709.
Adjust the notch of the part to the white marker of the symbol on the PWB. Do not allow any looseness.
(4) Take-up and supply sensors: D707 and D706.
Be careful not to confuse the setting direction of the parts in reference to the symbols on the PWB. Do not allow
any losseness.

5
VC-S101U
1. GENERAL INFORMATION
1-1 FEATURES
• S-VHS (S-VHS ET)
• Universal R/C
• EZ Set up (automatically channel set up)
• Auto Tracking
• AV Auto REC
• Tamper Proof Function
• Outline revision of chroma
• High speed FF/REW (x 360)
1-2 SPECIFICATIONS
1) Recording system Format: VHS NTSC standard
Luminance signal: FM recording
Chroma signal: Low frequency converted direct recording
Color system: NTSC
Number of video head: 4
Tape speed: SP (33.35mm/sec.)
LP (16.67mm/sec.) (playback only)
EP (11.12mm/sec.)
2) Video signal Input level: 0.5 ~ 2.0Vp-p, 75 ohm Unbalanced
Output level: 1.0Vp-p, 75 ohm Unbalanced
Horizontal resolution: 230 lines (SP mode), 400 lines (S-VHS)
Signal to noise ratio: 50dB (SP mode)
3) Audio signal Input level: –8dBs (309mVrms, 47k ohm)
Output level: –8dBs (309mVrms, 1k ohm)
Frequency response: 80Hz ~ 10kHz (SP mode linear), 20Hz ~ 20kHz (Hi-Fi mode)
Signal to noise ratio: 43dB (SP mode linear)
Hi-Fi Dynamic range: 85dB (Hi-Fi models)
Wow and flutter: 0.005% max. (Hi-Fi mode) with T-120 tape
4) Receiving channel VHF: Channels 1 ~ 13
UHF: Channels 14 ~ 69
CATV: Channels A-8, A-5 ~ W+84
Antenna input Impedance: VHF/UHF; 75 ohm
5) Misc. Fast forward/Rewind time: Approximate 1.0 minutes with T-120 cassette
Power source: 120V, 60Hz
Power consumption: 25W
Allowable ambient temperature: 5°C to 40°C (41°F to 104°F)
Operating humidity: below 80% RH
Dimensions: 430 (W), 281 (D), 92 (H) mm (16-15/16, 11-1/16, 3-5/8 inch)
Weight: 3.9kg (8.7 lbs)
Accessories included: 75 ohm coaxial cable, Operation manual, Timer card, Guarantee card (for SEC),
AV cable, S-VHS cable, Infrared remote control, Battery (2 pcs.)
Note: Specifications may be changed for improvement without notice.

VC-S101U
6
1-3 LOCATION OF MAJOR COMPONENTS AND CONTROL

7
VC-S101U
TOP CABINET : Remove 4 screws 1.
FRONT PANEL : Remove 2 screws 2and 7 clips 3.
Becarefulnottoundothelowerhooks
alone andattempt to tilt the front panel
outof position.The jackPWBholder's
right-hand hook may get broken.
Undothefrontpanel'supperandlower
hooks together and take out the front
panel untilted.
OPERATION PWB : Remove 1 clip a.
JACK PWB : Remove 1 screw 4and 1 clip b.
JACK PWB HOLDER : Remove 1screw 5.
FRONT AV PWB: Remove 2 clip cc
cc
c.
2. DISASSEMBLY AND REASSEMBLY
2-1. DISASSEMBLY OF MAJOR BLOCKS
MAIN PWB UNIT/
ANTENNA
TERMINAL
COVER
SHIELD CASE : Remove 1 screw 6and 7.(One of
the shield screws is also used to hold
the drum in place. Once this shield
screw has been removed, the drum
base gets loose. In reassembling, re-
fer to "Mounting the head amplifier
shield" and take the tape travel check-
ing procedure again.)
Y/C PWB HOLDER : Remove 3 screws 8.
MECHANISM / : Remove 2 screws 9, 2 screws 0,
2screws qand2 screwsw.(Takethe
mechanism, the PWBs, and the an-
tenna terminal board in this order out
of the chassis.)
BOTTOM PLATE : Remove 5 screws e.
5
4
c
b
a
Front AV PWB
Jack PWB
Operation PWB
Top Cabinet
1
1
1
C
8
8
13
13
13
12
11
C
2
10
9
10
9
a
Antenna
Terminal
Y/C PWB Holder
Operation PWB
Main PWB
Bottom Plate
6
7
SHARP
C
Front Panel
3
3

VC-S101U
8
1
2
3
4
5
6
5mm
30~40
mm
2-2 DISASSEMBLY OF MECHANISM AND MAIN PWB ASSEMBLY
1.WHEN REMOVING MECHANISM FROM MAIN PWB
Remove 1 screw 1from behind of the PWB.
Remove FFC cables which connects mechanism and
PWB.
Take out verticallyy the mechanism so that it does not
damage the adjacent parts.
2.REMOVING THE MECHANISM AND CASSETTE
CONTROLLER
Remove 2 screws 2fixing the cassette controller to
the mechanism, and remove the cassette controller.
1
2
REVISED DRAWING
(1)Remove this screw off the current shielding cover
(PSLDM4557AJFW) at the back of the P frame. Fit the
newshieldingcover(PSLDM4567AJFW)inposition,and
apply the screw again to fix the cover.
(2)Lead with terminal (QCNW-0311AJZZ)
a)PutsolderatthespecifiedspotontopoftheU/Vtuner.
b)Solder the tip of the lead in position.
c)Connect the terminal to the projection of the shielding
case.
(3)Screw (XHPSD26P06WS0)
Screw the shielding case to the mechanism chassis.
(4)Spacer (PSPAZ0438AJZZ)
Place the spacers in the positions shown above.
(5)Insulating sheet (PZETZ0004AJZZ)
Insert this sheet between the shielding cover and the
terminal board PWB. Using the mats (6), secure the
sheet tightly on the PWB.
(6)Fixing mat (ZTAPEZ950010E)
Applythetwoback-upmatstosecuretheinsulatingsheet
to the terminal board PWB.
(7)Without the insulating sheet (PZETL0001AJZZ) on the
left side of the P frame, attach the top cabinet in place.
Fold the FFC at these two locations.
<Preparatory dressing of the FFC>
Fold the FFC at two locations be-
tween the AC head and the main
PWB. Pass the FFC through the
shielding cover.

9
VC-S101U
INSTALLING THE CASSETTE CONTROLLER
When the cassette controller is installed on the mecha-
nism, the initial setting is essential condition.
There are two initial setting methods, namely electrical
and mechanical.
1. Electrical initial setting
So as to perform initial setting of mechanism execute the
Step1ofInstallationofcassettehousing.Afterascertain-
ing the return to the initial setting position (*1) install the
cassette controller. (Conditions: When mechanism and
PWB have been installed)
2. Mechanical initial setting
Feed the pulley feed gear of loading motor with screw
driver. After ascertaining the return to the initial set
position(*1)install thecassettecontrollerin thespecified
position.(Thismethodisappliedonlyforthemechanism.)
INSTALLING THE MECHANISM ON PWB
Lower vertically the mechanism, paying attention to the
mechanism edge, and install the mechanism with due
care so that the parts are not damaged. So as to fix the
mechanism to the main PWB install 1 screw.(Fix the
soldering side of the main PWB as well as some points
near the loading motor.) Connect again the FFC cable
between the mechanism and the main PWB.
Pulley feed gear
Screwdriver
Tilt mark (*1)
Casecon
drive gear
Drive angle of
cassette control
MOUNTING THE HEAD AMPLIFIER SHIELD
Insert the head amplifier shield to the connector. Tighten
up the two screws.
Afterreassemblingtheset,perform"A/CHEADXVALUE
ADJUSTMENT" to check the tape drive disversity.
PARTS WHICH NEED PARTICULAR CARE
Wheninstallingthe mechanismchassis onthe PWBunit,
take care so as to prevent deformation due to contact of
mechanism chassis with REC TIP SW.
2-3. CARES WHEN REASSEMBLING
REC TIP SWITCH
END SENSOR
START SENSOR

10
VC-S101U
3. FUNCTION OF MAJOR MECHANICAL PARTS (TOP VIEW)
1715 10 27
11
5
9
14
12
8
16
13
4
6
2
7
3
1
18
28
No. Function No. Function
1 Full erase head
2 Supply pole base ass’y
3 Tension arm ass’y
4 Idler wheel ass’y
5 Pinch drive lever ass’y
6 Supply reel disk
7 Supply main brake ass’y
8 Take-up main brake ass’y
9 Pinch drive cam
10 A/C Head ass’y
11 Reverse guide lever ass’y
12 Casecon drive gear
13 Take-up reel disk
14 Pinch roller lever ass’y
15 Drum ass’y
16 Loading motor
17 Drum motor
18 Take-up pole base ass’y
27 Fixing guide
28 I roller ass'y

11
VC-S101U
FUNCTION OF MAJOR MECHANICAL PARTS (BOTTOM VIEW)
No. Function No. Function
12 Casecon drive gear
19 Slow brake
20 Master cam
21 Capstan D.D. motor
22 Reel belt
23 Clutch lever
24 Limiter pulley ass'y
26 Shifter
26
24
21
22
19
20
12
23

12
VC-S101U
VROATSV CD
VROEFZCS
4. ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS
The explanation given below relates to the on-site general service (field service) but it does not relates to the adjustment
and replacement which need high-grade equipment, jigs and skill. For example, the drum assembling, replacement and
adjustment service must be performed by the person who have finished the technical courses.
4-1 MECHANISM CONFIRMATION ADJUSTMENT JIG
So as to perform completely the mechanism adjustment prepare the following special jigs. So as to maintain the initial
performance of the machine the maintenance and check are necessary. Utmost care must be taken so that the tape is
not damaged. If adjustment needs any jig, be sure to sue the required jig.
JiGTG1200 CN
JiGMP0001 BY
1. Torque Cassette Meter JiGVHT-063 CZ
No. Jig ltem Part No. Code Configuration Remarks
JiGTG0090 CM
3. Torque Gauge Head JiGTH0006 AW
5. JiGRH0002 BR
JiGSG2000 BS
JiGSG0300 BF
6.
7. JiGADP003 BK
2. Torque Gauge
Tension Gauge
These Jigs are used for checking
and adjusting the reel disk height.
Whenfixinganyparttothethreaded
hole using resin with screw, use the
jig. (Specified torque 5 kg)
Thiscassettetorquemeterisusedforcheck-
ing and adjusting the torque of take-up for
measuring tape back tension.
These Jigs are used for checking
and adjusting the torque of take-up
and supply reel disks.
Master Plane Jig and
Reel Disk Height
Adjusting Jig
Pinch pressing force
measuring jig
This Jig is used with the tension
gauge.Rotarytransformerclearance
adjusting jig.
There are two gauges used for the
tension measurements, 300 g and
2.0kg.
4. Torque Driver JiGTD1200 CB
9. JiGDRiVER11055 AR
Reverse guide height
adjusting box driver This Jig is used for height adjustment of the
reverse guide (for reverse guide height ad-
justment).
Guide roller height
adjustment drive This screwdriver is used for adjusting the
guide roller height.
For X value adjustment
X value adjustment
gear type screw driver
This Jig is used for height
adjustment of the reverse guide.
13. JiGRVGH-F18 BU
12. JiGDRiVER-6 BM
Reverse Guide Height
Adjusting Jig
11. JiGDRiVERH-4 AP
10. Alignment Tape

13
VC-S101U
Limiter pulley
Supply/take-up Main brake levers Tape slack
AHC (Automatic Head Cleaner)
Lateral noises Head
occasionally blocked
A/C head
Guide roller ass’y
Sup Guide Shaft
Retaining guide
Slant pole
Full-erase head Color and beating
Loading Motor
MAINTENANCE CHECK ITEMS AND EXECUTION TIME
Perform the maintenance with the regular intervals as follows so as to maintain the quality of machine.
Parts Maintained 500 hrs. 1000 hrs. 1500 hrs. 2000 hrs.
Upper and lower drum ass’y
Pinch roller
Capstan D.D. Motor
Idler ass’y
Tension band ass’y Screen swaying
NOTE : Part replacement. : Cleaning : Apply grease
<Specified> Cleaning liquid Industrial ethyl alcohol
* Thismechanismdoesnotneedelectricadjustmentwithvariableresistor.Checkparts.Ifanydeviationisfound,clean
or replace parts.
Possible symptom
encountered
Small sound or sound
distortion
Poor S/N ratio, no color
Poorflatnessoftheenve-
lope with alignment tape
Notaperunning,uneven
color
No tape running, tape
slack
Cassette not loaded or
unloaded
No tape running, tape
slack
Clean tape contact part with the
specified cleaning liquid.
Abnormal rotation or significant vibra-
tion requires replacement.
Remarks
Clean rubber and rubber con-
tactareawiththespecifiedclean-
ing liquid.
Cleantapecontactareawith the
specified cleaning liquid.
Replace the roller of the
cleaner when it wears
down.
Just change the AHC roller as-
sembly for new one.
No tape running, tape
slack, no fast forward/
rewind motion
Reel belt

14
VC-S101U
Figure 4-1.
• Reassembly
1. Before installing the cassette housing control, short-
circuit P803 provided at the center (when facing to the
main PWB), press the eject button. The casecon drive
gear turns and stops when the positioning mark ap-
pears. Engage two teeth of casecon drive gear with the
three teeth of casecon drive angle gear, and set on the
mechanism chassis as shown below.
Figure 4-2.
2. Install in the reverse order of removal.
Notes:
1. When fitting the S/E sensor holder to the cassette
controller frame L/R, take care.
2. Misengagementofteethofcasecondrivegearanddrive
anglegearcausesmalfunction.(Thecassettecannotbe
set, load and ejection are repeated).
3. Inthecasewhenyouusethemagnetscrewdriver,never
approach the magnet driver to the A/C head, FE head,
and drum.
4. When installing or removing, take care so that the
cassette housing control and tool do not contact the
guide pin or drum.
5. After installing the cassette housing control once per-
form cassette loading operation.
TO RUN A TAPE WITHOUT THE CASSETTE
HOUSING CONTROL ASSEMBLY
1. Remove the full-surface panel.
2. Short-circuit P803.
3. Plug in the power cord.
4. Turn off the power switch.
(The pole bases move into U.L.position.)
5. Open the lid of a cassette tape by hand.
6. Hold the lid with two pieces of vinyl tape.
7. Set the cassette tape in the mechanism chassis.
8. Stabilize the cassette tape with a weight (500g) to
prevent floating.
9. Turn on the power switch.
10. Perform running test.
REMOVINGANDINSTALLINGTHECASSETTE
HOUSING
• Removal
1. In the cassette removing mode remove the cassette.
2. Unplug the power cord.
3. Remove in the following numerical order.
a) Remove two screws 1.
b) Slide and pull up the cassette housing control.
1
Casecon
drive gear Casecon drive
angle gear
500g
Figure 4-3.
Mechanism chassis
Weighttoprevent
float (500g)
Note:
The weight should not be more than 500g.
To take out the cassette tape.
1. Turn off the power switch.
2. Take out the cassette tape.

15
VC-S101U
REEL DISK REPLACEMENT AND HEIGHT
CHECK
• Removal
1. Remove the cassette housing control assembly.
2. Pull the tension band out of the tension arm ass'y.
3. Remove the Supply/Take-up main brake ass'y.
4. Openthehookatthetopofthereeldisk,andremovethe
reel disk.
Note:
Take care so that the tension band ass'y and main brake
ass'y (especially soft brake) are not deformed.
4. Assemble the Supply main brake ass'y.
Notes:
1. When installing the reel disk, take due care so that the
tension band ass'y is not deformed and grease does no
adhere.
2. Donot damagethe Supplymain brakeass'y. Becareful
so that grease does not adhere to the brake surface.
• Reassembly (Take-up reel disk)
1. Clean the reel disk shaft and apply grease (SC-141) to
it.
2. Align the phase of the reel disk to that of the reel relay
gearandtoinstallanewtake-upreeldiskontotheshaft.
3. Check the reel disk height and reassemble the take-up
main brake ass'y.
Note:
1. Take care so that the Take-up main brake ass'y is not
damaged.Takecaresothatgreasedoesnotadherethe
brake surface.
2. After reassembly, check the video search rewind back
tension (see page 18), and check the brake torque (see
page 20).
• Height checking and adjustment
Note:
1. Set the master plane with due care so that it does not
contact the drum.
2. When putting the master plane, shift the reverse guide
alittlein theloadingdirection.Care mustbetakensince
excessive shift results in damage.
Figure 4-6.
Note:
Checkthatthe reeldisk islower thanpartAbut higherthan
part B. If the height is not correct, readjust the reel disk
height by changing the poly-slider washer under the reel
disk.
Figure 4-4.
Note:
When the tension band ass'y is pressed in the direction of
the arrow for removal, the catch is hard to be deformed.
Figure 4-5.
• Reassembly (Supply reel disk)
1. Clean the reel disk shaft and apply grease (SC-141) to
it.
2. Matchthephasesofreeldiskandreelrelaygear,andset
the new reel disk.
3. After checking the reel disk height, wind the tension
band ass'y around the reel disk, and insert into the hole
of tension arm ass'y.
Tension arm ass'y
Supply reel disk Take-up reel disk
Master plane
Reverse
guide
Position
pin
Supply main brake ass'y
Supply reel disk
Cassette lock
release shaft
Take-up reel disk
Tension band ass'y
Take-up main brake ass'y

16
VC-S101U
Note:
Wheneverreplacingthereeldisk,performtheheightcheck-
ing and adjustment.
Notes:
1. Hold the torque gauge by hand so that it is not moved.
2. Donotkeepthereeldiskinlockstate.Donotallowlong-
time measurement.
CHECKING AND ADJUSTMENT OF TAKE-UP
TORQUE IN REWIND MODE
• Remove the cassette housing control assembly.
• After short-circuiting P803 provided at the right of
display tube on the operation PWB, plug in the
power cord.
• Setting
1. Set a torque gauge to zero on the scale. Place it on the
supply reel disk.
2. Press the rewind button.
3. To calculate the remaining capacity, slowly rotate the
take-up reel disk, and then shift it into the rewind mode.
• Checking
1. Turn the torque gauge slowly (one rotation every 2 to 3
seconds) by hand in the CCW direction.
2. Makesurethat theindicationof torquegauge isnotless
than 30mN·m (306gf·cm).
AB
Figure 4-7.
Master plane Reel disk height
adjusting jig
Mechanism chassis
Reel disk
10 ±0.2mm Reel disk
CHECKING AND ADJUSTMENT OF TAKE-UP
TORQUE IN FAST FORWARD MODE
• Remove the cassette housing control assembly.
• After short-circuiting P803 provided at the right of
display tube on the operation PWB, plug in the
power cord.
• Setting
1. Set a torque gauge to zero on the scale. Place it on the
take-up reel disk.
2. Press the FF button.
3. To calculate the remaining capacity of the play back
mode, slowly rotate the supply reel disk, and then shift
it into the forward mode.
• Checking
1. Turn the torque gauge slowly (one rotation every 2 to 3
seconds) by hand in the CW direction.
2. Makesurethat theindicationof torquegauge isnotless
than 30mN·m (306gf·cm).
Figure 4-8.
Torque gauge
30mN·m (306gf·cm)
or more
The gauge is held at
its maximum value.
(Red mark)
Idler ass'y
• Adjustment
1. If the FF winding-up torque is less than the specified
value,cleanthecapstanD.D.motorpulley,reelbelt,and
limiter pulley with cleaning liquid, and check again.
2. If the torque is less that the set value, replace the reel
belt.
CW
Figure 4-9.
Torque gauge
30mN·m (306gf·cm)
or more
Supply reel disk
Idler ass'y
The gauge is held at
its maximum value.
(Red mark)
• Adjustment
1. Iftherewindwinding-uptorqueislessthanthespecified
value, clean the capstan D.D. motor pulley, drive belt,
andlimiterpulley withcleaningliquid, rewindagain, and
check the winding-up torque.
2. If the winding-up torque is still out of range, replace the
drive belt.
CCW

17
VC-S101U
Notes:
1. Hold the torque gauge by hand so that it is not moved.
2. Donotkeepthereeldiskinlockstate.Donotallowlong-
time measurement.
CHECKING AND ADJUSTMENT OF TAKE-UP
TORQUE IN RECORD/PLAYBACK MODE
• Remove the cassette housing control assembly.
• After short-circuiting P803 provided at the right of
display tube on the operation PWB, plug in the
power cord.
• Turn off the power switch.
• Open the cassette torque meter lid, and fix it with
tape.
• Load the cassette torque meter into the unit.
• Put the weight (500g) on the cassette torque meter.
• Turn on the power switch.
• Press the REC button, and set EP picture record
mode.
CHECKING AND ADJUSTMENT OF TAKE-UP
TORQUE IN VIDEO SEARCH REWIND MODE
• Remove the cassette housing control assembly.
• After short-circuiting P803 provided at the right of
display tube on the operation PWB, plug in the
power cord.
• Setting
Press the playback button and rewind button to set the
video search rewinding mode.
• Checking
Place the torque gauge on the supply reel disk, and turn it
counterclockwise very slowly (one rotation every 1 to 2
seconds) and check that the torque is within the set value
14.0 ±3.9mN⋅m. (144 ±40gf⋅cm)
Set value EP6.9 ±2.5mN⋅m (70 ±25gf⋅cm)
500g
Cassette torque meter
Figure 4-10.
• Checking
1. Make sure that value is within the setting 6.9±2.5mN·m
(70±25gf·cm).
2. The winding-up torque fluctuates due to variation of
rotation torque of limiter pulley ass'y. Read the center
value of fluctuation as setting.
3. SettheEPrecordmodeandmakesurethatthewinding-
up torque is within setting.
• Adjustment
If the playback winding-up torque is not within the setting,
replace the limiter pulley assembly.
Note:
When the torque cassette is set, put a weight (500g) to
prevent rise.
When the cassette torque meter is taken out.
Turn off the power switch.
Figure 4-11.
Torque gauge
Supply reel disk
Note:
Surely put the torque gauge on the reel disk to measure. If
the torque gauge is raised, accurate measurement is
impossible.
• Adjustment
Iftherewindingplaybackwinding-uptorqueisnotwithinthe
setting, replace the limiter pulley assembly.
Note:
The winding-up torque fluctuates due to variation of rota-
tion torque of supply reel disk. Read the center value of
fluctuation as setting.
CCW

18
VC-S101U
CHECKING THE VIDEO SEARCH REWIND
BACK TENSION
• Remove the cassette housing control assembly.
• After short-circuiting P803 provided at the right of
display tube on the operation PWB, plug in the
power cord.
• Checking
1. After pressing the play button, press the rewind button,
and set the video search rewind mode.
2. Placethetorquegaugeonthetake-upreeldisk,andturn
it counterclockwise very slowly (one rotation every 2 to
3 seconds) and check that the torque is within the set
value 3.4±1.5mN⋅m (35±15gf⋅cm).
Figure 4-12.
Torque gauge
Take-up reel disk
CCW
Notes:
Set the torque gauge securely on the take-up reel disk.
If it is not secure, the measurement will be incorrect.
CHECKING THE PINCH ROLLER PRESSURE
• Remove the cassette housing control assembly.
• After short-circuiting P803 provided at the right of
display tube on the operation PWB, plug in the
power cord.
• Checking
Press the play button to set the playback mode.
Figure 4-13.
1. Detach the pinch roller from the capstan shaft.
Do not separate excessively. Or the pinch lever and
pinch double action lever may disengage.
2. Engage the tension gauge adapter with the pinch roller
shaft, and pull in the arrow direction.
3. Gradually return the pinch roller, and measure the
pulling force when the pinch roller contacts the capstan
shaft.
4. Make sure that the measured value is within setting 8.8
to 11.8 N (900 to 1,200gf).
CHECKING AND ADJUSTMENT OF TENSION
POLE POSITION
• Remove the cassette housing control assembly.
• After short-circuiting P803 provided at the right of
display tube on the operation PWB, plug in the
power cord.
• Setting
1. Turn off the power switch.
2. Open the cassette tape (T-120), and fix with tape.
3. Set the cassette tape in loading state.
4. Put the weight (500g) on the cassette tape.
5. Turn on the power switch.
Pinch roller Tension gauge
8.8 - 11.8N
(900~1,200gf)
Capstan shaft
Tension gauge adapter
Figure 4-14.
500g
(T-120)
Weight to prevent
float (500g)
6. MaketheadjustmentwiththebeginningofaT-120tape.
• Checking
1. Set a cassette tape, push the REC button to place the
unit in the SP record mode. Now check the tension pole
position.

19
VC-S101U
2. Visuallychecktoseeiftherightedgeof thetensionpole
is within the 2.3 ±0.25 from the right edge of the Sup
guide shaft.
Insert the slotted screwdriver in the tension pole adjuster,
and rotate clockwise.
Figure 4-17.
At left side from the center line
Figure 4-15.
Figure 4-16.
Insert the slotted screwdriver in the tension pole adjuster,
and rotate counterclockwise.
At right side from the center line
Tension pole adjuster adjusting range
2.3 ±0.25
2.3 ±0.25
Sup guide shaft
Adjust so that the delta mark of tension pole adjuster is
within 90°range (left, right).
CHECKING AND ADJUSTMENT OF RECORD/
PLAYBACK BACK TENSION
• Remove the cassette housing control assembly.
• After short-circuiting P803 provided at the right of
display tube on the operation PWB, plug in the
power cord.
• Setting
1. Turn off the power switch.
2. Open the torque cassette meter and fix with tape.
3. Set the cassette tape in loading state.
4. Put the weight (500g) on the cassette torque meter.
5. Turn on the power switch.
Make the adjustment with the beginning of a T-120 tape.
Tension pole adjuster
90°
90°
Figure 4-18.
Tension pole
2.3 ±0.25
Weight to prevent
float (500g)
Cassette torque
meter
Figure 4-19.
500g
• Checking
1. Push the REC button to place the unit in the SP record
mode.
2. At this time ascertain that the back tension is within the
setting(36 to56g·cm) byseeing theindication oftorque
cassette meter.

20
VC-S101U
• Adjustment
1. If the indication of torque cassette meter is lower than
the setting, shift the tension spring engagement to the
part A.
2. If the indication of torque cassette meter is higher than
the setting, shift the tension spring engagement to the
part B.
• Checking the brake torque at the take-up side
Figure 4-22.
CCW: 8.8~23.5mN⋅m (90~240gf⋅cm)
CW: 4.9~11.8mN⋅m (50~120gf⋅cm)
• Remove the cassette housing control assembly.
• After short-circuiting P803 provided at the right of
display tube on the operation PWB, plug in the
power cord.
• Setting
1. Switch from the FF mode to the STOP mode.
2. Disconnect the power cord.
3. Set a torque gauge to zero on the scale. Place it on the
take-up reel disk.
• Checking
1. Turn the torque gauge at a rate of about one turn/2 sec
in the CCW direction/CW direction so that the reel disk
and torque gauge pointer rotates at equal speed and
make sure that the value is within the setting (CCW
direction: 8.8 to 23.5mN·m (90 to 240gf·cm), CW direc-
tion: 4.9 to 11.8 mN·m (50 to 120gf·cm).
2. Adjustmentofthebraketorqueatthesupplysideandthe
take-up side
• Unless the supply side brake torque or take-up side
brake torque is within the setting, clean the felt surface
of reel disk (supply, take-up) brake lever, check again
the brake torque.
• If value cannot be set within the setting yet, replace the
main brake ass'y or main brake spring.
Figure 4-20.
CHECKING THE BRAKE TORQUE
• Checking the brake torque at the supply side
CCW: 3.9~9.8mN⋅m (40~100gf⋅cm)
CW: 8.8~23.5mN⋅m (90~240gf⋅cm)
Figure 4-21.
• Remove the cassette housing control assembly.
• After short-circuiting P803 provided at the right of
display tube on the operation PWB, plug in the
power cord.
• Setting
1. Set a torque gauge to zero on the scale. Place it on the
supply reel disk.
2. Switch from the FF mode to the STOP mode.
3. Disconnect the power cord.
• Checking
Turn the torque gauge at a rate of about one turn/2 sec
in the CW direction/CCW direction with respect to the
supply reel disk so that the reel disk and torque gauge
pointer rotate at equal speed, and make sure that the
valueiswithinthesetting(CWdirection:8.8to23.5mN·m
(90 to 240gf·cm); CCW direction: 3.9 to 9.8mN·m (40 to
100gf·cm).
Tension arm
Tension spring
CW
CCW CW
Supply reel disk
Torque gauge
Torque gauge
CCW
Take-up reel
disk
AB