JVC HR-A630MS User manual

GENERALES
epi
ala)
ais
_
SPECIFICATIONS
7he
specitication
shown
per
Alimentation : CA 220 - 240 V~, 50/60 Hz
Consommation :24W
Températures — : 5°C a 40°C (Fonctionnement)
ie -20°C & 60°C (Stockage)
Position de
“fonctionnement : Seulement horizontale
‘Dimensions (LxHxP) : 400 x.94 x 340 mm
Poids 2 4,3 kg
Format : Standard VHS PAL/SECAM
Largeur de bande : 12,65 mm
Vitesse de bande
(VN) : 23,39 mm/s
(LD) 2.11,70 mm/s.
Durée maximale
-d'enregistrement
(VN) : 240 mn avec une cassette
vidéo E-240
(LD) : 480 mn avec une cassette
: vidéo E-240
VIDEO/AUDIO
Systéme de signal : Signaux couleur PAUSECAM
et monochromes CCIR, 625
= lignes/50 trames Me es
Systéme
d'enregistrement
:
Systéme
&
deux
fois
deux
: tates rotatives, balayage
: hélicoidal avec combinaison -
Pores de tétes vidéo DA4
Entrée : 0,5 42,0 Vcc, 75 ohms,
asymétrique
Sortie + ¥4,0.Vec, 75 ohms,”
: . ; asymétrique
Rapport signal/bruit :45.dB
rs
Résolution hérizon' 240.fignes -
Gamme de fréquence; 70 Hz:8.10.000 Hz
2 I (audio-normal)
a 7 8. 20 Hz a 20.000 Hz
Bo oe taudio Hi-Fi)
Entrée/sortie © mr Pet
21. be
(ENTREE/SORTIE x 1;
ENTREE/DECODEUR x 1)
Connecteurs RCA
° (ENFREE. VIDEO x 1;
ENTREE AUDIO x 1;
SORTIE AUDIO x 1)
SYNTONISEUR.
Systeme
de
syntonisat
ynténiseur
a
synthése
de
; aha “s8 fréquence
Capacité
de
canaux
TV...
::99
positions
—
; : go Ss ition AUX *AU")
Canaux couverts
_MINUTERIE
1e2ye
iF
Référence de I‘horloge
Capacité de
programmation
Durée de soutien
mémoire
ACCESSOIRES i
Accessoires fournis
ain
specifically
to
the
model
HR-J636MS)
: Par quartz
: Minuterie sur 1 an/8
programmes
> 60 mn
: Cable d'antenne,
Boitier de télécommande a
infrarouge,
Pile "R6" x2,
. Cable péritélévision,
Adaptateur antenne
Présentation et caractéristiques modifiables sans préavis.
COPYRIGHT
©
1996
VICTOR
COMPANY
OF
JAPAN,
LTD.
No. 82555
July 1996

TABLE OF CONTENTS
Section Title Page
important Satety Precautions
INSTRUCTIONS
1, DISASSEMBLY
1.1 DISASSEMBLY FLOW CHART ...
1.2 HOW TO READ THE DISASSEM AND ASSEMBLY ....
1.3 DISASSEMBLY/ASSEMBLY METHOD .....
1.4 CASSETTE HOUSING INSTALLATION
1.5 SERVICE POSITION oo. ~
1.5.1 How to take out the Mechanism and Main board assembiies .....
1.5.2 Cautions on cassette loading when mechanism is In
service position ...
1.5.3 Cassette loading and ejecting procedures when
mechanism is in service position .
1.5.4 Opening on the chassis ........
1.6 MECHANISM SEAVICE MODE
1.6.1 How to set the “MECHANISM SERVICE MODE”
1.7 EMERGENCY DISPLAY FUNCTION .
1.7.1 How to display record of an emergency
1.7.2 Detail of emergency faults «......
1.7.3 How to clear emergency record
2. MECHANISM ADJUSTMENT
2.1 PREPARATION ...
2.1.1 Precautions ....
2.1.2 Check without cassette housing assembly
2.1.3 Manual! removal of loaded tape
2.1.4 Test Equipment .............
2.2 MAIN MECHANISM PARTS .
2.2.1 Cleaning ...
2.2.2 Lubrication ...
2.3 INSPECTION ANI i
2.3.1 Suggested servicing schedule for main components .....
2.4 DISASSEMBLY/ASSEMBLY PROCEOURE OF MECHANISM ...
2.4.1 Precaution before disassembling mechanism .................
2.4.2 How to set the exclusive mechanism operation mode
(MECHANISM ASSEMBLING MODE) ..
2.5 MAIN PARTS REPLACEMENT OF MECH
2.5.1 Pinchi Roller Arm Assembly .
2.5.2 AC Head ..
2.5.3 Pinch plate
2.5.4 Mode Motor .
2.5.5 Lever Assembly,Sub Deck Assembly,Capstan Motor
2.5.6 Control Bracket-1 ...
2.5.7 Reel Bracket, Slit Disk (take-up) .
2.5.8 Control Bracket-2,Control Plate ..
2.5.9 Sub Brake (take-up),Control Cam ..
2.5.10 Slide Plate oo... eens
2.5.11 Change Lever,Rotary Encoder .
aca ed) wk sea daca a
ooooayuuaa
PVRVYYEVERPD
PhESWOWNN HH —
VAYNNYHY HNN N HNN
ODANNNODOHHSSSE
2.5.12 Sub Brake (supply), Tension Band Assembly, Tension Ari
Assembly, Take-up Lever Assembly, Slit Disk (supply)
2.5.13 Take -up Head, Tension Arm Lever
2.5.14 Guide Rail ........
2.5.15 Stator Assembly ..
2.5.16 Rotor Assembly ...
2.5.17 Upper Orum Assembly
2.6 CHECKUP AND ADJUSTMENT OF MECHANISM PHASE .
2.6.1 Precaution
2.6.2 Loading Arm Assembly(supply,take-up) ..
2.6.3 Rotary Encoder,Change Lever,Contro! Cam ..
2.6.4 Slide plate ...
2.6.5 Control Plate ..
2.7 TAPE INTERCHANGEABILITY ADJUSTMENT .
2.7.1 Tape pattern...
2.7.2 AIC head height & azimuth .
2.7.3 A/C head phase (X-vaiue)
2.7.4 LP mode auto tracking .
2.7.5 Tension pole position
2.7.6 Take-up torque ......
3.ELECTRICAL ADJUSTMENT
3.1 PRECAUTION
3.1.1 Required test equipment .
eee ee et wOOo NNOOU AA WWONNN~OOO
PPVPVVVY EYP YY VYYYND
we 31
P|
Section Title
3.4.2 Required adju:
Bie) cin ee
3.2 SEAVO CIRCUIT .
3.2.1 PB switching poi
3.2.2 Siow tracking preset
3.3 VIOEO CIRCUIT ...
3.3.1 AUTO Picture ...
3.4 SYSCON CIRCUIT ..
3.4.1 Timer clock .......
3.5 TUNER CIRCUIT .
3.5.1 RF VCO .....
3.5.2 SIF VCO
3.5.3 RF AGC .....
3.5.4 33.4MHz TRAP
3.5.5 40.4MHz TRAP ....
3.6 DEMODULATOR CIRCUIT ...
3.6.1 STEREO SEPARATION ....
4. CHARTS AND DIAGRAMS
SCHEMATIC DIAGRAM NOTES .
CIRCUIT BOARD NOTES ........
4.1 BOARD INTERCONNECTIONS
4.2 SYSTEM CONTROL BLOCK DIAG
4.3 VIDEO BLOCK DIAGRAM .
4.4 AUDIO BLOCK DIAGRAM .
4.5 VIDEO AND AUDIO SCHEMATIC DIAGRAM
4.8 SYSTEM CONTROL SCHEMATIC DIAGRAM .
4.7 SWITCHING REGULATOR SCHEMATIC DIAGRAM.......
4.8 TUNER SCHEMATIC DIAGRAM .
4.9 SERVO SCHEMATIC DIAGRAM
4.10 ON SCREEN SCHEMATIC DIAGRAM(or HA-J636MS) ..
4.11 TERMINAL (MAIN) SCHEMATIC DIAGRAM.
4.12 PRE/REC SCHEMATIC DIAGRAM
4.13 FMA SCHEMATIC OIADRAM .......,
4.14 MAIN AND A/C HEAD CIRCUIT BOARDS ..
4.15 TERMINAL SCHEMATIC DIAGRAM.
4.16 TERMINAL CIRCUIT BOARD .
4.17 IF SCHEMATIC DIAGRAM .
4.18 IF CIRCUIT BOAAD........
4.19 DEMODULATOR SCHEMATIC DIAGRAM .
4.20 DEMODULATOR CIRCUIT BOARD .....
4.21 SW/DISPLAY,SW/JACK,REC SAFETY AN
SCHEMATIC DIAGRAMS (for HR-J636MS)
4.22 SWIDISPLAY,SWIUACK.REC SAFETY AND CASSETTE SW CIRCUIT
BOARD (for HR-J6Q6MS) .....-.ceceseseeesieseneee 4247
4.23 DISPLAY, SW/JACK,REC SAFETY AND CASSETTE SW
SCHEMATIC DIAGRAMS (for HR-A63OMS/MS(C)) .......... 4-49
4.24 DISPLAY, SWIJACK.REC SAFETY AND CASSETTE SW CIRCUIT
BOARDS (for HR-A6SOMS/MS(C)}
4.25 PDC SCHEMATIC DIAGRAM
4.26 POC CIACUIT BOAAD ...........
4.27 FOP GRID ASSIGNMENT AND ANODE CONNECTION ..
4.28 REMOTE CONTROL SCHEMATIC DIAGRAM .....
5. PARTS LIST
5.1 PACKING AND ACCESSORY <M1>
5.2 CABINET AND CHASSIS ASSEMBLY <M2> ..
5.3 MECHANISM ASSEMBLY <M4>
5.4 ELECTRICAL PARTS LIST .....
MAIN BOARD ASSEMBLY <03> ..
TERMINAL BOARD ASSEMBLY <06>
IF BOARD ASSEMBLY <07> ........escceees ~ 15
AUDIO/CONTROL HEAD ASSEMBLY <t2> . 5-16
OEMOD SOARD ASSEMBLY <14> ..... 5-16
DISPLAY BOARD ASSEMBLY <28> ... 5-17
REC SAFETY BOARD ASSEMBLY «32>
CASSETTE SWITCH BOARD ASSEMBLY <33>.
SW/JACK BOARD ASSEMBLY <36> ..
POC BOARD ASSEMBLY <70>
6 TECHNICAL INFORMATION
6.1 SYSCON CIRCUIT ooo seescsssseeetnsssssseneecenmasensee 6-1
The feltoming labie trate Ine ditfersng oonis between
Wodels (HR-AG1OMS WR-AGJOWS (C)_ ang A-JEIENS! 8 tha series
a a
ST PICTURE
fest

Important Safety Precautions
Prior to shipment from the factory, JVC products are strictly inspected to conform with the recognized product safety and electrical codes of
the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following
precautions when a set is being serviced
@ Precautions during Servicing
1. Locations requiring special caution are denoted by labels and
inscriptions on the cabinet, chassis and certain parts of the
product. When performing service. be sure to read and comply
with these and other cautionary notices appearing in the opera-
ON and service manuals
2. Parts identified by the A symbol and shaded ( ) parts are
critical for safety
Replace only with specified part numbers
Note: Parts in this category also include those specified to
comply with X-ray emission standards for products using
cathode ray tubes and those specified for compliance
with vanous regulations regarding spurious radiation
emission,
3. Fuse replacement caution notice
Caution for continued protection against fire hazard.
Replace only with same type and rated fuse(s) as specified.
. Use specified internal wiring. Note especially:
1) Wires covered with PVC tubing
2) Double insulated wires
3) High voltage leads
5. Use specified insulating materials for hazardous live parts. Note
especially:
1} Insulation Tape 3) Spacers 5) Barrier
2} PVC tubing 4) Insulation sheets for transistors
6. When replacing AC primary side components (transformers,
power cords, noise blocking capacitors, etc.) wrap ends of wires
securely about the terminals before soldering
“its bo h*
7, Observe that wires do not contact heat producing parts (heat-
sinks, oxide Metal film resistors, fusible resistors, etc.)
8. Check that replaced wires do not contact sharp edged or pointed
parts
9. When a power cord has been replaced, check that 10-15 kg of
force in any direction will not loosen it.
Power cord
Fig. 2
. Also check areas surrounding repaired locations
. Products using cathode ray tubes (CRTs)
In regard to such products, the cathode ray tubes themselves,
the high voltage circuits, and related circuits are specified for
compliance with recognized codes pertaining to X-ray emission.
Consequently, when servicing these products, replace the cath-
ode ray tubes and other parts with only the specified parts.
Under no circumstances attempt to modify these circuits.
Unauthorized modification can increase the high voltage value
and cause X-ray emission trom the cathode ray tube.
to prevent safety hazards,
according to the following steps
12. Crimp type wire connector
In such cases as when replacing the power transformer in sets
where the connections between the power cord and power
wansformer primary lead wires are performed using crimp type
connectors, if repiacing the connectors is unavoidable, in order
perform carefully and precisely
1) Connector part number : £03830-001
2) Required tool . Connector crimping tool of the proper type
which will not damage insulated parts
3) Replacement procedure
(1) Remove the old connector by cutting the wires at 8 point
close to the connector
Important : Do not reuse a cOnnector (discard it).
524
\lz
S
ho. 10 connector
Fig. 3
(2) Strip about 15 mm of the insulation from the ends of the
wires. tf the wires are stranded, twist the strands to avoid
frayed conductors.
15 mm
2
Fig. 4
(3) Align the lengths of the wires to be connected. Insert the
wires fully into the connector
Metal
sleeve
Connector
Fig.S
(4) As shown in Fig. 6, use the crimping tool to crimp the
metal Sleeve at the center position. Be sure to crimp fully
to the complete closure of the tool.
eS hey Cr
20
3
Fig. 6
(5) Check the four points noted in
Not easily pulled free
Wire insulation recessed
more than 4 mm
Fig. 7
imping tool
Fig. 7.
Crimped at approx. center
of metal sleeve
Conductors extended
SECTION 1
DISASSEMBLY
1.4 DISASSEMBLY FLOW CHART
This flowchart lists shows the disassembly steps for the
cabinet parts and P.C. boards in order to gain access to
item(s) to be serviced. When reassembling. perform the
step(s) in reverse order. Bend,route and dress the flat cables
as they were originally.
@
Top cover
¢
Bottom cover
[= 28 J
[Front panel assembly 7
© ©
®
SW/JACK & SW/DISPLAY board assemblies]
1.3 DISASSEMBLY/ASSEMBLY METHOD
PART NAME
TOP COVER 5(St)
—}-
@ | BOTTOM COVER O2 | (S2}, 7(L1}
©) FRONT PANEL ASSEMBLY| D3 | 7121, °JOG/SHUTTLE [NOTE1>
(J636MS)
eeeremeees bec
ao SW/JACK & SW/DISPLAY| D4 1 12(L3),°CN1201 |<NOTE2>
BOARD ASSEMBLIES i *CN1204
©) | CASSETTE HOUSING | D5 | 2(S3) ,2(S4)
ASSEMBLY
Cassette housing assembly |
ey
Shield case
© © ®@
DRUM assembly
>)
Main deck assembly
@
1.2 HOW TO READ THE DISASSEMBLY AND ASSEMBLY
Main board assembly
PART NAME
TOP COVER
BOTTOM COVER {$2), 7{L1)
1
FRONT PANEL ASSEMBLY | D3 } 7(L2),*JOG/SHUTTLE | <NOTE 1>
(J636MS)
+ + +
SW/JACK & SW/DISPLAY | D4 | 12(L3),°CN1201, | <NOTE 2>
®
®
®
BOARD ASSEMBLIES *CN1204
®
©
+
CASSETTE HOUSING | DS j 2(S3),2(S4)
ASSEMBLY
; 4 am
SHIELD CASE D6 } 2(S5),*CN1
a
(1) (2) {3} (4) (5)
(1) Order of steps in Procedure
When reassembling, perform the step(s) in the reverse
order. These numbers are also used as the identification
(location) NO. of parts Figures.
(2) Part name to be removed or installed.
(3) Fig.No. showing procedure or part location
(4) Indentification of part to be removed, unhooked, unlocked,
released, unpluged,unclamped or unsoldered. P = Spring,
W = Washer, S = Screw, L = Locking tab, * = Unhook,unlock,
release, unplug or unsolder.
(5) Adjustment information for installation
+—
SHIELD CASE 06
+—
DRUM ASSEMBLY
D7 | 3(S6),WRI,
MAIN DECK ASSEMBLY | D8 | 2(S7),.WR2
WR3,2(L4),°CN703
OI
MAIN BOARD ASSEMBLY | D9 | 2(S8)
<NOTE1>
When reattaching the front panel assembly, make sure that
the door opener (@) of the cassette housing assembly is low-
ered in position prior to the reinstallation.
<NOTE2>
When plugging the connector in, check that the flat wire is
inserted properly and fully.
<NOTE3>
When reattaching the cassette housing assembly, pay careful
attention to the switch lever not to make it touch the REC
switch knob of the REC SAFETY board assembly from the
upside. ;
(If the REC switch knob of the REC SAFETY board assembly
is damaged, cassette loading is impossible.)
<NOTE4>
When plugging the connector in, check that the flat wire is
inserted properly and fully.
<NOTE5>
* When removing the Main deck assembly only, unhook the
two spacers connecting it with the Main board assembly
with pliers from the back side of the Main board assembly
first, and then remove the Main deck assembly.
« When reattaching the Main deck assembly to the Main
board assembly, make sure to set the spacers into the
retaining slots respectively.
11
tt
<A
ROLE
LC
CE
LICE
LCC
ACCC
LO
AL
CT
LL
AE
ETT
RT
DT
TR
TT

Fig. 01
THE FRONT SIDE
FOIL SIDE
Fig. D3
(S3)
THE FRONT SIDE
FOWL SIDE
Fig. D7
Fig. D2
Fig. D4
Fig. D8

Fig. D9
1.4 CASSETTE HOUSING INSTALLATION
NOTE: Observe the mechanical phase and position
(see figure) when installing the cassette hous-
ing assembly. If these are incorrect, the system
will not operate properly even when tape is
inserted.
1. Check that the hole of the control cam are aligned to the
deck hole. !f necessary, turn the loading motor belt by
hand to adjust the position.
Loading Motor Belt
Pinch Plate
Hole align with
hole in deck
14
1.5 SERVICE POSITION
1.5.1 How to take out the Mechanism and Main board
assemblies.
(1) Remove the Top cover, Front panei assembly, CN1201
and CN1204 of the SW/DISPLAY and SW/JACK board
assemblies.
(2) Take out 4 screws @>. 2 screws (@ and 1 screw (C)
as shown in Fig.1-5-17.
|
CN1204
Sg
mn
Fig. 1-5-1
(3) Remove the Mechanism assembly (including Cassette
housing) and Main board assembly out of the chassis as
shown in Fig. 1-5-2.
(5) Turn over the Mechanism assembly and Main board
assembly then connect CN1201and CN1204 of the SW/
DISPLAY and SW/JACK board assemblies.
(8) Carry out checke & rapaire as nocessary at shown in
Fig.1-5-3.
Note: When input the AUDIO/VIDEO signal from connector,
connect CN1204 of the SW/JACK board assembly.
(HR-J636MS only)
SW/JACK board assembly
REC SAFETY board assembly
CASSETTE SWITCH board assembly
SW/DISPLAY board assembly
Fig. 1-5-3
1.5.2 Cautions on cassette loading when mechanism is
in service position
The REC SAFETY board assembly of this set serves both
for detecting the safety tab (erasure prevention tab) of a cas-
sette and detecting a cassette loaded. Therefore, cassette
loading in the condition that the mechanism is disassembled
from the set needs manual operation of the switches of the
REC SAFETY board assembly and the CASSETTE SWITCH
board assembly.
1.5.3 Cassette loading and ejecting procedures when
mechanism is in service position
(1) Insert a cassette tape halfway into the cassette housing
assembly.
(2) Press the switch of the REC SAFETY board assembly to
turn on.
(3) When the cassette loading begins and the cassette goes
down to the bottom, immediately press the switch of the
REC SAFETY board assembly to turn off and hold the sta-
tus that the switch of the CASSETTE SWITCH board as-
sembly is turned on. (Fix the switch with adhesive tape
or put a screwdriver, etc. on it to leave the switch in the
ON status.)
(4) In this status, desired operations (recording, playback,
fast forward, rewind, etc.) can be performed.
Note: When the mechanism is in the service position, the
safaty tab of cassette tape is not detected and record-
ing on cassette tapes without safety tab is possibie.
Therefore, carefully choose a cassette tape for op-
eration in this mode so as to avoid using cassette
tapes of important recording.
(5) For ejecting the cassette in this status, do it in the
reverse order of cassette loading mentioned above.
Note: /f the manual operation REC SAFETY switch timing
is incorrect, the cassette may be completely or par-
tially ejected, and the cassette is often ejected incom-
pletely. in such a case, it is possible to take out the
cassette by hand.
If it is desired to load a cassette again after the cassette is
ejected in the above procedure, make sure to set the tray
of the cassette housing assembly in the frontmost position
prior to loading the cassette once again.
1-5

1.5.4 Opening on the chassis.
The chassis assembly has openings for easy access to the
checkpoints and connector pins as shown in Fig.1-5-4.
peceee
Fig. 1-5-4
Rotary Encoder
, SPACER
@
TP1101
CTL P.
TP333
A.ERASE
TP334
F.ERASE
1.6 MECHANISM SERVICE MODE
This medel has 2 unique function tw enter the meshenism
into every operation mode without loading of any cassette
tape. This function is called the "MECHANISM SERVICE
MODE".
1.6.1 How to set the "MECHANISM SERVICE MODE"
(1) Disconnect VCR from AC.
{2) Remove the Top cover, Front panel assembly and
cassette housing assembly. (See Page 1-2, 1-3)
(3) Connect TP1202 (GND) and TP1201 (TEST) on the SW/
DISPLAY beard assembly with 9 jume wire
(4) Connect VCR to AC.
(5) Press the POWER button.
(6) Select the desired operation modes with the operation
buttons or remote controller.
TERMINAL board assembly
sal
TP334
F. ERASE
IF board mii
DEMOD board
assembly
PDC board
assembly |
an)
SW/ JACK
board assembly
c
REC SAFETY
board assembly
TEST
SW/DISPLAY
board assembly
CASSETTE SW
board assembly
Fig. 1-6-1
1-7

1.7 EMERGENCY DISPLAY FUNCTION
This product has the function to store the last two previous
emergency faults which can be displayed in the FDP when
servicing.
1.7.1 How to display record of an emergency faults
(1) Press "N" button of the presetting unit more than 2
seconds. and the two previous emergency faults are
shown in the FDP.
(2) Press "N° button of the presetting unit again when
return the norma! mode.
[Example] E:01:03
a Emergency faults before last
Emergency faults of the last
time
Example} E:——:—-— +No record of emergency
1.7.2 Detail of emergency faults
1.7.3 How to clear emergency record
Press the COUNTER RESET button on the remote contro+
ler in the emergency record display mode,and the record of
the emergency fauit(s) is cleared.
without shift to next mode.
TU REEL FG input is absentifor more than 4 Sec)
DRUM FF input is absentifor more than 3 Sec)
[i ed
FDP Symptom Detect mode Resulting mode
+
£:01 | Loading motor rotates for more than 8 Sec Loading POWER OFF
; without shift to next mode.
+ 4-
i E:02 Loading motor rotates for more than 8 Sec Unloading POWER OFF
REC/PLAY/FF/REW
SEARCH FF/SEARCH REW
STOP -» POWER OFF
REC/PLAY/FF/REW
SEARCH FF/SEARCH REW
E£:06 CAPSTAN FG input is absentifor more than 1 Sec)|} REC/PLAY/FF/REW STOP —- POWER OFF
mi SEARCH FF/SEARCH REW
st
E.07 No SWD5V/12V POWER ON POWER OFF
ee
Table 1-7-1 EMERGENCY FAULTS
SECTION 2
MECHANISM ADJUSTMENT
2.1 PREPARATION
2.1.1 Precautions
{1} Disconnect VCR from AC power before soldering.
(2) Avoid imparting stress to wires when disengaging con-
nectors.
(3) Determine and correct the cause of difficulty before pro-
ceeding to adjustments.Do not disturb settings
unnecessarily.
(4) Use care not to damage tabs,claws,etc during repairs.
(5) Install the cassette housing assembly only when the
mechanism is in the MECHANISM ASSEMBLING
MODE position.
(6) When installing the Front panel assembly,be sure to
engage the housing door with the door opener of the
cassette housing assembly.
If this is omitted,the cassette door will not open at Eject
and the cassette can not be removed. (See SECTION
1 DISASSEMBLY.)
2.1.2 Check without cassette housing assembly.
Mechanism operations can be observed easily by removing
the cassette housing assembly. Use the MECHANISM
SERVICE MODE. (See SECTION 1 DISASSEMBLY. )
2.1.3 Manual removal of loaded tape
When the deck enters the emergency mode with cassette
tape loaded and it can not be ejected by pressing the EJECT
button, take out of the cassette tape according to the follow-
ing procedure.
(1) Disconnect the power cord from AC outlet then take out
the Top cover and Front panel assembly.
(2) Turn the loading motor on the Main deck assembly by
hand in the unloading direction to where the pole base
assembly (supply and take-up) is positioned below the
cassette tape.At that time, pay careful attention to the
tape not to get soiled with grease.
(3) Take out 4 screws of the cassette housing assembly.(See
SECTION 1 DISASSEMBLY. }
(4) Remove the cassette housing with slackened tape and
guard panel of cassette.
(5) Wind up the tape by turning the reel hub(either supply
or take-up side for convenience) from the bottom of the
cassette,and remove the cassette tape.
Loading Motor
Pole Base Assembly - Guide. Arm Assembly
Fig. 2-1-1
2-1
fo ea tn mea SNR eA AA A eA

2.1.4 Test Equipment
Ee
Alignment
tape
(LP)
Back
tension
cassette
gauge
AC
head
positioning
tool
MHPE-L
PUJ48076-2
PTU94010
a
Algnment tape (SP}
MHPE
PTU94002 PTU94008 KYODO-SH-P
AO |
—
Roller driver i Presetting unit Grease r
Table 2-1-1 Test equipment
2.2 MAIN MECHANISM PARTS
Drum Assembly A/C Head
Stator Assembly Capstan Motor Loading Motor
Guide Rail
FE Head YY at i — Belt (Loading Motor)
40
;
f
Pinch
Roller
Arm
Assembly
Guide Arm Assembly
C}-Lever Assembly
Control
Plate
Control
Cam
s- Change Lever Assembly
| Ek pa AS
|e ee
Tension Band Assembly
Se
Slide Piate Slit Disk Pole Base Assembly Slit Disk
(SUP) (TU) (TU)
Fig. 2-2-1 Top view of main deck
2-2
(a
EEE
i,
(CGleoa 10)
aay
Belt (Capstan}
Fig. 2-2-2 Bottom view of main deck
2.2.1 Cleaning
Periodic cleaning of the tape transport system is desirable, but
usually not feasible in practice. Therefore,perform cleaning
when a set is brought in for repairs or maintenance. Con-
tamination of the video heads,tape guides and brush can
detract from playback picture quality and in extreme
cases,even damage the tape.For cleaning,use a finemesh
cotton clothiabout the texture of a white dress-shirt) mois-
tened in alcohol. It is recommended to also clean thetape
tension posts and capstan.
* To clean the video heads, press the moistened cloth
gently against the upper drum with fingertip and turn the
drum by hand.
¢ Do not use a vertical stroke,as this may damage the
heads.
2.2.2 Lubrication
Oil and grease do not normally require periodic replenishing.
Apply only when replacing lubricated partslaiso clean and
replace lubrication of mating parts if soiled). For parts and
points to apply oil and grease, refer to the exploded views
of the mechanism assembly. Before oiling,clean with alcohol.
Apply one or two drops of oil. Avoid excess oil.
1. Table 2-2-1 indicates the oil and grease used in this set.
Use these or recommended locally available equivalents.
Oil COSMO-HV56
Grease KYODO-SH-P
Table 2-2-1
2. Grease is not required for a replacement cassette hous-
ing assembly,as this has been applied at the factory.
NOTE: Stir grease that has been stored for an extended
period.
2:3

2.3 INSPECTION AND MAINTENANCE
This product employs rotary and moving parts which wear
out in the course of usage. Periodic inspection, cleaning, lu-
brication and maintenance are therefore important for ensur-
ing
maximum
performance.
Worn
parts
must
aiso
be
re-
placed as and when required.
2.3.1 Suggested servicing schedule for main components
The following table indicates the suggested period for such
service
measures
as
cleaning,lubrication
and
replacement
'n practice, the indicated periods will vary widely according
to environmental and usage conditions. However, the indi-
cated components should be inspected when a set is
brought for service and the maintenance work performed if
necessary. Also note that rubber parts may deform in
ume,even if the set is not used.
System
t
Tape transport
Drive
Other
Parts Name Operation Hours
L
\
~1000H
|
~2000H
|
Upper
drum
assembly
KO
i
©
if
AC
head
KO
|
*O
{Lower drum motor assembly |e KO
Pinch
roller
arm
assembly
a
|
*
Full
erase
head
|
*
x
| Tension arm assembly i * | *
Guide arm assembly i o* *
Capstan
motor
=|
O
Belt (Capstan) i O O
Belt (Loading motor) O
Loading motor O
Slit disk (supply, take-up) O
Clutch unit (supply, take-up) O
Worm gear assembly O
Control piate 2 ; EKG
Slide
plate
|
ae.
|
Brush
assembly
7
i
AO
1
KO
Tensionbandassembly
|
OQ
|
©
Rotary
encoder
O
|
% : Cleaning
C; : Inspection or Replacement if necessary
Table 2-3-1
24
2.4 DISASSEMBLY/ASSEMBLY PROCEDURE OF
MECHANISM
2.4.1 Precaution before disassembling mechanism
This mechanism has an exclusive operation modo provided
for disassembling and installation of the mechanism
(MECHANISM ASSEMBLING MODE), and it is suggested
lo set the mechanism to this mode before disassembly and
installation The exclusive mechanism operation mode is not
generally used and becomes available by manuai setting only.
Then this procedure starts with the condition that the cabi-
net parts,cassette housing assembly and PRE/REC board
assembly have been removed.
2.4.2 How to set the exclusive mechanism operation
mode (MECHANISM ASSEMBLING MODE)
(1) Turn the loading motor belt by hand.
(2) Confirm that the hole of the control cam are aligned to
the deck hole as shown in Fig.2-4-1.
Loading Motor Belt
oe
tl
1+
|
Hole align with
hole in deck
Control Cam
Fig. 2-4-1
2.5 MAIN PARTS REPLACEMENT OF MECHANISM
2.5.1 Pinch Roller Arm Assembly
(1) Remove the slit washer.
(2) Tilt up the pinch roller assembly in direction of arrow.
Slit Washer
Pinch Roller
Arm Assembly
2.5.2 A/C Head
1, Removal
{1} Take out 2 screws (A).
(2) Remove the A/C head with head base.
Head Base
(A)
Fig.2-5-2
(3) When replacing the A/C head only,remove 3 screws (B),
use Care not to misplace the 3 springs.
(B)
AIC Head
’ Board
AIC Head
Zo 7
s Head Base
ow &
eo
SS
Fig.2-5-3
2. ‘Installation
(1) Temporarily set AYC head height as indicated in Fig. 2-54.
A/C Head
gus /
Fig.2-5-4
NOTES:
* It is very important to correctly adjust the control pulse and
audio signal in addition to the mechanical tape path.
* Perform interchangeability adjustments after electrical ad-
justments,
2.5.3 Pinch Plate
1. Removal
1) Disengage 2 claws, then remove the pinch plate.
f
Pinch Plate
Fig.2-5-5
2. Installation ;
(1) When installing pinch piate,align rack of pinch plate and
triangle mark of control cam as indicated in Fig.2-5-6.
Pinch Plate
Control Cam Correct direction
L
Fig. 2-5-6

2.5.4 Loading Motor
(1) Disengage the belt between loading motor and worm gear.
(2) Take out 2 screws (A) then remove the loading motor.
Red Line
(to CN703
Fig.2-5-7
2.5.5 Lever Assembly,Sub Deck Assembly,Capstan Motor
(1) Take out 1 slit washer,then remove the lever assembly.
(2) Disengage the belt( capstan motor) from bottom of
mechanism assembly first as indicated in Fig.2-5-10.
(3) Take out 3 screws (A) and remove the sub deck assembly
as indicated in Fig.2-5-8.
(4) Take out 3 screws (B) and remove the capstan motor
trom the sub deck assembly as indicated in Fig.2-5-9.
(A)
Stit Washer
Lever Assembly
Fig.2-5-8
2-6
2.5.6 Control Bracket-1
(1) Take out 1 screw {A) and 1 screw (8).
(2) Remove the control bracket-1.
(B)
Sub Deck
Assembly
eA GK
Cty} =) A
cl TY Co
Capstan Motor
Fig.2-5-13
Fig.2-5-9 Fig.2-5-11
2.5.7 Reel Bracket,Slit disk (take-up),Control Bracket-2 2.5.8 Control Plate
(1) Take out 2 slit washers. (1) Take out 1 slit washer.
(2)
Remove
the
reel
bracket
and
slit
disk(take-up).
(2)
Disengage
2
claws
and
remove
the
contro!
plate.
(3) Take out 1 screw (A) and remove the control bracket-2.
Slit Washer
Control Plate
Fig.2-5-10
Fig.2-5-14
2-7