Philips VR299/55 User manual

Video
Cassette
Recorder
|
VR299s5,
VR399i65
erwice
Service
Service
Contents Specification:
Chapter
Video
recording
system:
Rotary
2-head
helical
scan
system
,
eg
-
Antenna
input
Signal:
PAL
BG
DKISECAM
K1
meee
Antenna;
VHF/UHF
75
external
antenna
terminal
2
Mechanism
adjustments
Video
Output
Channel:
UHF
36
(Adjustable
CH28-CH60)
75Q. unbalanced oO
3
Electrical
adjustments.
Power
requirement:
AC
110V
—
240V,
~
50/60Hz
= ; Power consumption: 18Ww
4
Charts
and
diagrams
|
Operating
temperature:
+44°F
(5°C)
to
104°F
(40°C)
*
. Relative humidity: 10% 10 80%
Be) TENS Weight: 3.2kg
Dimensions: 360 x 94.5 x 281mm
- Safety regulations require that the set be restored to its original
condition and that parts which are identical with those specified be
used. ;
Published
by
CFC99PIVM
Videq
Service
Department
Printed
in
the
Netherlands
©
Copyright
reserved
Subject
to
modification
482?
726
15619

TABLE OF CONTENTS
Section Title Page
1, DISASSEMBLY
1.1. DISASSEMBLY FLOW CHART .. Ds ee ee ea ee Beemer Pree rere |
1.2 HOW TO READ THE DISASSEMBLY AND ASSEMBLY .. Sia Soaiacadeiatevoseiwnasbiah weet ixveniaty eae aanevees 1-1
1.3 DISASSEMBLY/ASSEMBLY METHOD. qu... .cccceeesceceeses cesses ces cesaeeeceensneceesesseecoseeeeecousaeseusauesanuensnaneses 1
1.4 SERVICE POSITION.. 1-4
1.5 MECHANISM SERVICE MODE .. : : sisi
1.6 EMERGENCY DISPLAY FUNCTION .. pusidisstuacibushurtvcssecuassbateccanes (ouisvcvusesevtacabissresnoniviae sueeveadahees¥sectendiceweeses 1-6
2. MECHANISM ADJUSTMENT
2.1 BEFORE STARTING REPAIRAND ADJUSTMENT 0. .ccccssscssesssssssessusersscsesnnerssareisessrsesssessneseneeeseeeeees 2-1
2.2 REPLACEMENT OF MAJOR PARTS. ......-cccccsesecceetireseeeseeeeeecesaneeesessaeeecessaeeeceemeeneeneseaese See nMaenaneanetanaas? 2-6
2.4 COMPATIBILITY ADJUSTMENT uo. cc ccceccee cesses cssecsecsneasnsssuscusessseusucessseususessenseyssuesrenpenseeseesesseeessesseaeeaene ss 2-20
3. ELECTRICAL ADJUSTMENT
BAL! SPREGAUTION cof scestshecsics cede scechudaetvasvads satipupsvedesestesecs scentesstina Cactve oatveostude sesvanetstoenidecendsatdevistesssvecsearecntties 3-1
3.2 SERVO CIRCUIT cissessssasssssccctcesscosccesesscseccscensssssaessonevensursenseesssscnsersnssnseeess wauidughiaovs scat auieusasedeusbaccevevietoun 2
3.3. SYSCON CIRCUIT, sisccccccccec cakes Sesisel dcdacenbedecbenndsly. cc dschsewaceus vicesvsedbovanedsseveioeceinecesonsosseaseceneisnncactcessoeces 3-3
4. CHARTS AND DIAGRAMS
NOTES OF SCHEMATIC DIAGRAM 2.0... cesccccceeseeseseseersoecessessesassnecnecoeceesnseenvecuessassneecsonsansseesnsasnsnssassaseressces 4M
CIRCUIT BOARD NOTES .....ssssssenssersrsnssonsseeosornncssoesesveusendsessssnseassassavsnssesenss sslin ade Meee ae 4-2
4.1 BOARD INTERCONNECTIONS... ccccceceee setters tesecscneseeceesseeeceeenssetcnsasaenectan eae sanas eee sareneeaeesneneeeaeeney sersees 4-3
4.2 VIDEO/N.AUDIO BLOCK DIAGRAM ........ee cece cecscesenetenseueenanesuecenserseeseeesseeegeatieepeesesseessnenesseeeneesaenetees 4-5
4.3 ON SCREEN SCHEMATIC DIAGRAM .....ctecsesteercccceeseesecneecescnsecseneaesenessausasaueaesaeseaussaeeautusngesseanesgneerseges 4-7
44 SYSCON CONTROL SCHEMATIC DIAGRAM ........ccceeseetseesestareenresenseeanrersessanensnsseraatsstsessarsensseteareseesees 49
4.5 SWITCHING REGULATOR SCHEMATIC DIAGRAN ............- deessdesatodads stacsdascicavascasseiensiacfisuenadeseasitesarsds 411
4.6 TUNER SCHEMATIC DIAGRAM .....-:....cecccsssessoossesseonsssnssersnsesrsossssccasesosossqsacavocassasausrarsonsnssessnssscaresreners 4°13
4.7 TERMINAL SCHEMATIC DIAGRAM .....ccesssseesenreees Snatacestaeed pilates Glen asset an uaeeeasaa aueandans as ae LO
4.8 SW/BISPLAY SCHEMATIC DIAGRAM ....... cee ecccssessessestreensenseracser seresseecgeseeeeeareesseeeas jSiesouesuscessactien 4
4.9 MAIN AND A/C HEAD CIRCUIT BOARDS . yee 421
4.10 REMOTE CONTROL SCHEMATIC DIAGRAM VR290/55 .. Gheasbcegvcigaasensededeudesvensgedeatadesesbese scien 4°20
4.11 REMOTE CONTROL SCHEMATIC DIAGRAM VRS&QQ9/55 .......-.eseseereennenes sadubacnshd cgauaccestuanedeuveaqanesaneas 4-24
4.12 FDP GRID ASSIGNMENT AND ANODE CONNECTION wu... cesses cescerrsererscecesseteeesspecenenssseesnecneeaeeneeseaeee 4-25
AAS: VOLTAGE: GHAR TS wiscccticelssciaaccavisiessrsrsabsdestsceoracdenssacdesscesnceodansena uhasaaseauijieel Savsutcciadeanhcnlansapiabasantaesencacens 4-26
4.14 SYSTEM CONTROL BLOCK DIAGRAM . 00... eececseearsetsenteersasenerceresseeesseeceenseeqeasasseecnaesseneescaeensaaeens 4-29
4.15 VIDEO BLOCK DIAGRAM ......cccceccstseeteteseessptenesseecesseeceeas ene ceesnennee saat snine ene geCSHgnESRHaEEEERIBEERE EEE SHEE ESEESEE ES 4-31
4.16 AUDIO BLOCK DIAGRAM o.oo... eee ceeeeceeeceeeseraasaseansccseececensseepeessaecaecnsaseaecassecaeaasaascaneansascaaecansaeeeneess 4-33
5. PARTS LIST
5.4 ACCESSORIES AND ASSEMBLY <M1> .00.. eee csssesntensseenceeeseesreassnessceereenssereerarserscarqeiseseneeensseeseneens 5-1
5.2 CABINET AND CHASSIS ASSEMBLY <M2> oo... eeeccccesceseeseeeessereeecesneeeceeeeseeesseeecesesseeeceeceedaseaeeaneeaneneas 5-3
5.3 MECHANISM ASSEMBLY <M4> 0... ecesececceccesseecoesanseeneesaeepsassaneees sa ausedsseraarisasionssavasespivesatessecscomesseas? 5-5
Be ETE TRIGA PERS LYST oes aaa sec lated aca este cpus crates poner nats tetepeclal vouayeacdeunsaoaiastantisl kinivonods 5-5

SECTION 1
DISASSEMBLY
1.1. DISASSEMBLY FLOW CHART
This flowchart lists the disassembling 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 aid. ay aie
[ Toe cover
| Bracket
ee: ee
| Front pane assembly
DRUM assembl
Mechanism assembly
Main board assembl
@@oP®O8O
1.2 HOW TO READ THE DISASSEMBLY AND ASSEMBLY
PART NAME POINT
TOP COVER 3{$1)
BRACKET 2{S2)
FRONT PANEL 7(L1}
ASSEMBLY
2(S3)(VR389/55), |<NOTE 3>
3(S4), (L2}, WR1,
WR2, *CN1,
CLEANER ASSEMBLY, |
DRUM SHIELD
[VR399/55]
BRUM ASSEMBLY
MECHANISM D5 | 2($5),2(S6),2(L3}, |}<NOTE 3>
ASSEMBLY WR3, *CN1 <NOTE 4>
MAIN BOARD {$6},
ASSEMBLY 6(L4)(VR399/55),
S(L4)IVR299/55}
fr of ff
(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) Identification of part to be removed, unhooked, uniocked,
released, unpluged,unclamped or unsoidered. P = Spring,
W = Washer, S = Screw, L = Locking tab, * = Unhaok,unlock,
release,unplug or unsolder.
{5) Adjustment information for installation
1.3 DISASSEMBLY/ASSEMBLY METHOD
PART NAME
TOP COVER
BRACKET
FRONT PANEL
ASSEMBLY
DRUM ASSEMBLY 2{83}(VR399/65),
3(S4), (L2}, WR1,
WR2, *CN1,
CLEANER ASSEMBLY,
DRUM SHIELD
IVR389/55]
2{$5),2(S6),2(L3},
WR3, *CN4
; MECHANISM
ASSEMBLY
MAIN BOARD {$6},
ASSEMBLY Si{L4})(VR399/55),
3IL4}(VR299/55)
<NOTE1>
When reattaching the Front panel assembly, make sure that
the door opener (@) of the Cassette holder assembly is low-
ered in position prior to the reinstallation.
<NOTE2>
When reattaching the Front panel assembly, pay careful at-
tention to the switch lever'not to make it touch the switch
knob (6) of the Main board assembly from the side.
(If the switch knob of the Main board assembly is damaged,
cassette loading is impossible.}
<NOTE3>
When inserting the flat wire into the connector, be careful
not to make a mistake in the positioning of its electrodes.
<NOTE4>
* When it is required to remove the screws (S5) retaining
the Mechanism assembly, please refer to the "Procedures
for Lowering the Cassette holder assembly". (See on pages
1-3.}
* When removing the Mechanism assembly only, unhook
the two spacers connecting it with the Main board as-
sembly with pliers from the back side of the Main board
assembly first, and then remove the Mechanism assem-
bly.
* When reattaching the Mechanism assembly to the Main
board assembly, take care not to damage the sensors on
the Main board. (D3001: LED, Q3002: Start sensor, Q3003:
End sensor}
1-1

NOTE : When installing the DRUM assembly, secure the
screws ($4) in the order of A, B, C.
DRUM SHIELD
(VR399/55)
(S3}
(VR399/55)
CLEANER
ASSEMBLY

FOIL SIDE
= <NOTE 3
Q3003
End sensor
<NOTE 4>
D3001 Q3002
LED Start sensor
<NOTE 4> <NOTE 4>
Fig. DS
VR299/55
Procedures for Lowering the Cassette holder assembly
As the mechanism of this unit is integrated with the
Housing assembly, the hoider must be lowered and
the two screws unscrewed when removing the
Mechanism assembly.
Turn the loading motor pulley in the direction as indicated
by Fig.2. As both@and@®)levers are lodged twice, push the
levers in the direction as indicated by Fig.3 to release them.
When pushing the levers, do it in the order of &.®.©.6.
When the holder has been lowered, turn the pulley until the
cassette holder is securely in place without allowing any up/
down movement.
1-3

1.4 SERVICE POSITION
In order to facilitate diagnosis and the repair of the Mecha-
nism assembly, this unit is constructed so as to allow the
Mechanism and Main board assemblies to be removed to-
gether from the Chassis assembly.
1.4.1. How to take out the Mechanism and Main board
assemblies
{1) Remove the Top cover, Bracket and Front panel assem-
bly. (See 1.3 DISASSEMBLY/ASSEMBLY METHOD. Take
care not to pull the drum wire {Fig.D4} fram CN1,)
(2) Lower the cassette holder, and make the preparations
"required in order to remove the screws from the Mecha-
nism assembly. (Refer to the “Procedures for Lowering
the Cassette holder assembly” on pages 1-3 of 1.3 DIS-
ASSEMBLY/ASSEMBLY METHOD.)
(3) Take out 2 screws ®), 2 screws ® and 1 screw © as
shown in Fig. 1-4-1.
Fig. 1-4-1
(4} Remove the Main board and Mechanism assemblies to-
gether while holding the edge of the Main board assem-
bly. At this stage be careful of the power cord and prongs
of the jacks on the back side. (See Fig. 1-4-2.)
Fig. 1-4-2
{5) Connect the power cord to the isolation transformer, and
lift the cassette holder.
(Before turning on the power make sure that there is
nothing which may produce a short circuit, such as faulty
soldering.}
(6) When performing a diagnosis or repair of the Main board
assembly with a cassette tape in place, turn on the
power, insert a cassette tape, and turn over the Main
board and Mechanism assemblies together.
NOTES: ¢ When carrying out diagnosis and repair of the
Main board assembly in the service position,
be sure to ground both the Main board and
the Mechanism assemblies.
if they are improperly grounded, there may be
noise on the playback picture or the FDP
counter display may move even when the
mechanism is kept in an inoperative status. -
* When performing diagnostics of the tape play-
back or recording condition in the “SERVICE
POSITION”, enter the desired mode before
turning the set upside down, and do not
change the mode during diagnostics while the
set is placed upside down. If you want to
switch the mode, turn the set to the normal
position.

MAIN BOARD ASSEMBLY <03>
. Fig. 1-4-3
1.6 MECHANISM SERVICE MODE
This model has a unique function to enter the mechanism
into every operation mode without loading of any cassette
tape. This function is called the “MECHANISM SERVICE
MODE".
1.5.1 How to set the "MECHANISM SERVICE MODE”
{1} Disconnect VCR from AC.
(2) Connect TPGND and TP7001(TEST) on the Main béard
assembly with a jump wire.
’ (3) Connect VCR to AC.
{4} Press the power button.
(5) With lock levers @® on the left and right of the Cas-
sette holder assembly pulled toward the front, slide the
holder in the same direction as the cassette insertion di-
rection. (For the positions of lock levers @®, refer to
the “Procedures for Lowering the Cassette holder as-
sembly” on pages 1-3 of 1.3 DISASSEMBLY/ASSEMBLY
METHOD.)
{6} The cassette holder lowers and, when the loading has
completed, the mechanism enters the desired mode.
TP2033 TP106
A, ERASE PB. FM
Main board
assembly
Fig. 1-5-1

4.7.2 Syscon CPU pin function {iIC3001} 2/2
iN/OUT
OUT
FUNCTION
OUT
CLOCK FOR DATA TRANSFER TO THE TUNER UNIT
TU DATA OUT
TUNING DATA
FWE
NC
OUT CHIP ENABLE OF THE TUNER UNIT
TUNER SYSTEM “L” MODE:L.
NC
NMIIL)
NC
TIMER CLOCK (32.768KHz}
Xi
TIMER CLOCK (32.768KHz)
RESiL)
RESET TERMINAL (RESETON:L)
OSC1(IN)
MAIN SYSTEM CLOCK(10MHz}
VSS
OSC2(QUT)
GND
MAIN SYSTEM CLOCK(10MHz}
VCC
SYSTEM POWER
MODE
NC
TU A MUTE(H}
~ TUNER AUDIO MUTE CONTROL (MUTE:H)
TU V MUTE(H}
TUNER VIDEO MUTE CONTROL (MUTE:H)
Sw
TUNER SYSTEM “L“ MODE:H
SERIAL DATA TRANSFER CLOCK FOR MEMORY IC
SERIAL DATA TRANSFER OUTPUT FOR MEMORY IC
77 NC
78 NC
73 NC
80 | AUDIO MUTE CONTROL (MUTE:H}
81 NC
82
86 LP SHORT(H)
87 N.REC ST(H)
- NC ‘
as AUDIO SOUND RECORDING START
88 | H.REC STIH) NC
sg | BAVIH) NC
90 [NC - |_NC
g1__| OSDCS
92 SYNC DET(H)
J2C CLK2
12C DATA2
NC
NC -
NC -
A.MUTE(H) ‘| QUT
FMA_ADJ “
VCC - SYSTEM POWER
CCIRIH) . NC
VSS - GND
SPSHORTIH) - NC
|
DETECTION OF VIDEO SYNC SIGNAL (DETECTED:H}
93 P.MUTE(L)
PICTURE MUTE CONTROL (MUTE:L}
OUT | CHIP SELECT FOR THE ON-SCREEN IC
] aE
O
ga | SECAM(H) - NC
95 | iP ONH) - NC
96 | NC - NC
97 | N.REC(H} OUT | NORMAL AUDIO REC MODE CONTROL (REC:H)
98 | C.SYNC iN COMPOSITE SYNC
| 99 | AFF - NC
NC ESD oR ees aoe ee ee eS
[104 ['s PatrySP SEARCH [SG
IMG eet oe cee NOS we gg et ee eg et
DRUM PICKUP PULSE INPUT (SWITCHING PULSE)
DRUM FG PULSE INPUT |
[tog [vec systepowen OO OS—SSCSCSC“‘(SSNNNNNNT
fi Mise oe hee OND er gr ee
Poui2_ | cTuRer CU CTLREFERENCEVOLTAGE—“*‘“C*s‘“‘“‘“CS*C™*™*™C™C™C*@CY
Table 1-7-2 SYSCON CPU pin function(2/2)
=
4
oO

SECTION 2
MECHANISM ADJUSTMENT
2.1 BEFORE STARTING REPAIR AND ADJUSTMENT
2.1.1 Precautions
(1) Unplug the power cable of the main unit before using
your soldering iron.
(2) Take care not to cause any damage to the conductor
wires when plugging and unplugging the connectors.
(3) Do not randomly handle the parts without identifying
where the trouble is.
{4} Exercise enough care not to damage the lugs, etc. dur-
ing the repair work.
(5) When installing the front panel assembly, be sure to hock
the lug on the back side of the cassette door to the door
opener of the cassette holder. If this operation is ne-
glected it will not be possible to remove. the cassette
when ejecting because the housing door cannot be
opened.
2.1.2 Checking for Proper Mechanical Operations
Enter the mechanism service mode when you want to op-
erate the mechanism when no cassette is loaded. (See 1.5
MECHANISM SERVICE MODE.)
2.1.3 Manuaily Removing the Cassette Tape
1, In case of electrical failures _
If you cannot remove the cassette tape which is loaded be-
cause of any electrical failure, manually remove it by taking
the foliowing steps.
(1) Unplug the power cable and remove the top cover,
bracket and front panel assembly. (See 1.3 DISASSEM-
BLY/ASSEMBLY METHOD.)
(2} Unload the cassette by manually turning the loading mo-
tor of the mechanism assembly toward the front. In do-
ing so, hold the tape by the hand to keep the slack away
from any grease. (See Fig.2-1-1.}
(3) Bring the pole base assembly (supply or take-up side) to
a pause when it reaches the position where it is hidden
behind the cassette tape.
(4) Move the top guide toward the drum while holding down
the lug @ of the bracket retaining the top guide. Like-
wise hold part @) down and remove the top guide.
Section © of the top guide is then brought under the
cassette lid. Then remove the top guide by pressing the
whole cassette tape down. (See Fig.2-1-2.)
(5) Remove the cassette tape by holding both the slackened
tape and the cassette lid.
(6) Take up the slack of the tape into the cassette. This com-
pletes removal of the cassette tape.
Loading motor
Pole base assembly
Fig. 2-1-4
Fig. 2-1-2
2-1

2. in casa of mechanical failure
if you cannot remove the cassette tape which is loaded be-
cause of any mechanical failure, manually remove it by tak-
ing the following steps.
(1) Unpiug the power cable and remove the top cover, front
panel assembly and others so that the mechanism as-
sembly is visible. (See 1.3 DISASSEMBLY/ASSEMBLY
METHOD.)
{2} While keeping the tension arm assembly of the mecha-
nism assembly free from tension, pull the tape on the
pole base assembly (supply or take-up side) out of the
guide roller, (See Fig.2-1-3.}
Pole base assembly
(supply side}
Tension arm assembly
{3) Take the spring of the pinch roller arm assembly off the
hook of the press lever assembly, and detach it from the
tape. (See Fig.2-1-4.}
{4} In the same way as in the electrical failure instructions in
2.1.3 (4), remove the top guide.
(5) Raise the cassette tape cover. By keeping it in that posi-
tion, draw out the cassette tape case from the cassette
holder and take out the tape.
(6) By hanging the pinch roller arm assembly spring back on
the hook, take up the slack of the tape into the cassette.
Pole base assembly (take-up side)
Pinch roller arm assembly
_Guide pole guard
Take the spring off the hook,
and detach it from the tape.
Press lever assembly
” Fig. 2-1-4

2.1.4 Jigs and Tools Required for Adjustment
Alignment tape {SP} Alignment tape {LP} Back tension cassette gauge AIC head position bit
‘
4822
397
30262
4822
397
30261
4822
395
90615
4822
395
90916
id
Roller driver
4822 395 90904
Presetting unit
4822 395 90915 |
Ses
Table 2-1-1 Jigs and tools required for adjustment
2.1.5 Maintenance and inspection
4. Location of major mechanical parts
(12)siator assembly UY catcher? (take-up side) (76) Audio control head
1) UV catcher2 (supply side} 73) Drum assembly (Ts) Head base 7) Loading motor
|
q oF
An i (T8) Guide pole guard
ea
Pinch roller arm
assembly
1) Lid guide
717) Press lever
assembly
12) Guide arm
assembly
Full erase Read
Pole base assembly
{supply side)
Tension arm
assembly
23 Adjust pin
2 Tension brake
assembly
{take-up side)
114) Sub brake assembly
(take-up side)
Main brake assembly
Reel disk take-up sid
{supply side) te) Idler lever 8 idler arm assembly foreman)
2) Rec safety lever Main brake assembly tw) Pole base assembly (take-up side}
(supply side)
Fig. 2-1-5 Mechanism assembly top side

Capstan motor Capstan brake assembly Loading arm gear (supply side)
Plate
(supply side)
Relt (oading motor)
& ° Belt (capstan) Loading arm gear (take-up side}
Controt
brackett
Worm gear
69) Control cam
619 Take-up head 6i)) Take-up lever
@8 Rotary encoder guide Change lever assembly 613 Clutch unit .
Fig. 2-1-6 Mechanism assembly bottom side
Door
opener
Leading motor
Cassette housing bracket Worm gear
Bett (loading moter}
Fig. 2-1-7 Mechanism assembly left side Fig. 2-1-8 Mechanism assembly right side
2-4

Note:
This
table
shows
the
order
in
which
parts
are
removed
for
replacement.
To
replace
parts,
remove
them
in
the
order
of
4
to
18.
as
shown
in
the
table.
To
install
them,
reverse
the
removal
sequence.
The
circled
numbers
(symbols
and
numbers)
preceding
the
individual
part
names
represent
the
numbers
in
the
"Lo-
cation
of
major
mechanical
parts"
table.
Also,
the
"T",
"B",
and
"T/B”
on
the
right
of
each
part
name
shows
that
the
particular
part
is
removed
from
the
front,
from
the
back,
and
from
both
sides
of
the
mechanism,
respectively.
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———
1223
Guide
rail
TIA
gs
|
RARER
eee
See
Roller
cam
assembly
T
{3
Ss
ee
sacle
223
Cassette
housing
bracket
TIA
Exe
i)
|2.23
Opener
guide
|
T
{2
1
|_|
fe
seth,
Seepe
ae
STA
223
Door
apener
TI3
1]
2
ao
HEH
— [223
Relay
gear
ra
1/2
|
|
||
i
22.3
Limit
gear
|
T
|
3
1|2
rte
|i
caper
ste)
aged
|
— ]223
Cassette
holder
assemioly
Tlefilela{4|s
|_|
jE
223
Drive
gear
[7
|
rf2]a
|
a
sled
—
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2-5

2. Cleaning
Regular cleaning of the transport system parts is desirable
but practically impossible. So make it a rule to carry out clean-
ing of the tape transport system whenever the machine is
serviced.
When the video head, tape guide and/or brush get soiled,
the playback picture may appear inferior or at worst disap-
pear, resulting in possible tape damage.
(1) When cleaning the upper drum (especially the video
head}, soak a piece of closely woven cloth or Kimu-wipe
with alcoho! and while holding the cloth onto the upper
drum by the fingers, turn the upper drum
counterclockwise.
Note: Absolutely avoid sweeping the upper drum
vertically as this will cause damage to the
video head.
(2} To clean the parts of the tape transport system other than -
the upper drum, use a piece of closely woven cloth or a
cotton swab soaked with alcohol.
(3) After cleaning, make sure that the cleaned parts are com-
pletely dry before using the video tape.
3. Lubrication
With no need for periodical lubrication, you have only to lu-
bricate new parts after replacement. If any oil or grease on
contact parts is soiled, wipe it off and newly lubricate the
parts,
(1) See the mechanism assembly and disassembly diagrams
{M4) for the lubricating or greasing Spots. See Table 2-1-
2 for the types of oil or grease to be used.
Symbols on the disas-
Type sembly diagrams
ao er
Table 2-1-2 Grease and oil used for the unit
4. Suggested servicing schedule for main components
The following table indicates the suggested period for such
service measures as cleaning,lubrication and replacement.
In 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
time,even if the set is not used.
Operation Hours
< wy ~2000H
Upper drum assembly
A/C head
Lower drum assembly
Pinch roller arm assembly
Full erase head
Tension arm assembly
Capstan motor (Shaft)
ue arm assembly
Capstan motor
Parts Name
Tape transport
Capstan brake assembly -
Main brake assembly
Belt (Loading motor)
Loading motor
Clutch unit
Worm gear
Control plate
Brush ae *O
Tension brake assembly
Rotary encoder
%: Cleaning
O: inspection or Replacement if necessary
Table 2-1-3
2.2 REPLACEMENT OF MAJOR PARTS
2.2.1 Before Starting Disassembling (Phase matoning
between mechanical parts)
The mechanism of this unit is closely linked with the rotary
encoder and system controller circuits.
Since the system controiler detects the status of mechani-
cal operation in response to phases of the rotary encoder
{internal switch positions), the mechanism may not operate
properly unless such parts as the rotary encoder, control
plate, loading arm gear, contro! cam, cassette gear, limit gear,
relay gear and drive gear are installed in their correct pasi-
tions.
Especially, this model is not provided with any cassette hous-
ing assembly, so that cassette loading and unloading must
be accomplished by operation of the cassette holder assem-
bly. The latter is in turn driven by such parts as the drive
gear, relay gear and limit gear. Exercise enough care, there-
fore, to have the phases of all this gear matching one an-
other.
(For information on phase matching of the mechanism, see
the instructions on how to install individual parts.)

This unit is provided with a mechanism assembly made. It
is therefore necessary to enter this mode for assembling and
disassembling
procedures.
This mode is usually not in use, manually set it when it is
required.
2.2.2 How to Set the Mechanism Assembling Mode
Remove the mechanism assembly and place it bottom side
up. (See SECTION 1 DISASSEMBLY.) Tum the worm gear
toward the front so that the guide hole of the control cam is
brought into alignment with the hole at the mechanism as-
sembly chassis. This position renders the mechanism assem-
bling mode operational. Make sure that the control plate is
located in alignment with the mark E, (See Fig.2-2-1,)
Chassis hole
Worm gear
Guide hole
Control cam
Contro! piate
Fig. 2-2-1
2.2.3 Cassette Holder Assembly
1. How to remove
{1} Remove the guide rail and roller cam assembly. (See
Fig.2-2-2.}
{3 lugs on the guide rail and one lug on the roller cam
assembly}
Guide rail
Roller cam
assembly Lug
Fig. 2-2-2
(2) Remove the two slit washers and remove the cassette
housing bracket. (See Fig.2-2-3.)
{3} Remove the opener guide, spring(A), door opener, relay
gear and limit gear. (See Fig.2-2-3.)
Relay gear
Door opener Slit washers
Cassette housing oracket
Fig. 2-2-3
2-7

(4) While swinging the lock levers (R} and {L} of the cassette
holder assembly toward the front, slide the cassette
holder assembly until its legs come to where the guide
rail and the roller cam assembly have been removed (so
that the drive arm is upright). (See Fig,2-2-4.}
Cassette holder assembly
Drive arm
Lock lever (L} (Upright)
\.
Cassette holder assembly
Fig. 2-2-6
(6) Draw out the drive gear, and remove the drive arm.
Drive arm
Fig. 2-2-4
Main deck right side
(5) While holding the left side of the cassette holder, lift the
cassette holder assembly so that the three legs on the
left side are ali released. Then pull the legs @ and
on the right side out of the raii and also pull up the leg
©. (See Fig.2-2-5 and Fig.2-2-6.}
Cassette holder assembly
Drive arm
Fig. 2-2-5
PR

2. How to install (Phase matching)
(4) Insert the section @) of the drive arm into the section
of the main deck.
(2) Insert the section() of the drive gear into the round hole,
and the section @) into the square hole on the drive arm.
(See Fig.2-2-7.}
(3) Hold the drive arm upright and fit the leg © on the right
side of the cassette holder assembly into the groove.
(See Fig.2-2-8.)
{4} While swinging the lock lever (R) of the cassette holder
assembly toward the front, put the legs @) and @) into
the rail. (See Fig.2-2-3.}
(5) Drop the three legs on the left side of the cassette holder ~
assembly into the groove at one time. (See Fig.2-2-9.}
(6) Slide the whole cassette halder assembly toward the
front to bring it to the eject end position.
{7) Install the limit gear so that the notch on the outer cir-
cumference of the limit gear is brought into alignment
with the guide hole on the main deck. (See Fig.2-2-10}
(8) Install so that the notch on the periphery of the relay gear
is aligned with the notch of the main deck and that hele
A of the relay gear is aligned with the hole A of the limit
gear and that hole B of the relay gear is aligned with the
hole B of the drive gear. (See Fig.2-2-10.}
{9) Install the door opener, opener guide, spring(A) and cas-
sette housing bracket and fasten the two slit washers.
Cassette holder assembly
Lock jever {R}
Drive arm
Fig, 2-2-8
Relay gear.
Cassette holder assembly
Notches Guide hole
Drive gear
Fig. 2-2-16
Notch
Limit gear
2-9

2.2.4 Pinch Roller Arm Assembly
1. How to remove
(1) Remove the spring from the hook of the press lever as-
sembly.
{2} Remove the slit washer and remove the pinch roller seat
2. (See Fig.2-2-11.}
(3} Remove the pinch roller arm assembly by pulling it up.
Slit washer
Pinch roller seat2
Pinch roller arm
assembly
Press lever assembly
Pinch roar arm assembly
Fig. 2-2-11
2.2.5 Guide Arm Assembly and Press Lever Assembly
1. How to remove
(1) Remove the spring and expand the lug of the lid guide
in the arrow-indicated direction. Then remove the guide
arm assembly by pulling it up.
{2} Remove the press lever assembly by pulling it up. (See
Fig.2-2-12.}
Press lever
assembly
oo ||||
. ii Guide arm
i o) assembly
- ;
Lid guide Lug
Fig. 2-2-12
2-10
2.2.6 Audio Control Head
1. How to remove
{1} Remove the two screws (A) and remove the audio con-
trol head together with the head base.
Audio control head
Fig. 2-2-13
{2} When replacing only the audio control head, remove the
three screws (B) while controlling the compression
spring.
Screws(B)
Audio contro head
Compression
springs
[| Audio contral head
board assembly
Head base
Fig. 2-2-14
2. How to install
{1} To make the post-instaliation adjustment easier, set the
temporary level as indicated in Fig.2-2-15. Also make sure.
that the screw center is brought into alignment with the
center position of the slot.
Head base
AIC head
=
. Head base Audio control head
Fig. 2-2-15

2.2.7 Loading Motor
1. How to remove
(1} Remove the belt wound around the worm gear.
{2} Open the two lugs of the motor guide and remove the
loading motor, loading motor board assembly and motor
guide altogether by pulling them up.
{3) When replacing the !oading motor board assembly, take
care with the orientation of the loading motor. {Install so
that the loading motor label faces upward.)
(4) When the motor pulley has been replaced, choose the
fitting dimension as indicated in Fig.2-2-16.
ading motor board assembly
Loading motor
Motor guide
6.5+0.2 mm
Motor pulley
Fig. 2-2-16
2.2.8 Capstan Motor
4. How to remove
(1) Remove the beit (capstan) on the mechanism assembly
back side..
. {2) Remove the three screws (A) and remove the capstan
motor.
Screws(A)
ee Screw(A)
Ws
Capstan motor
Fig. 2-2-17
2. How to install (Centering the mounting position}
When the capstan motor has once been removed and then
reinstalled out of the initial correct position in the rotationa!
direction, the capstan motor current may be unstable dur-
ing operation in high or low temperatures. This may result
in greater Wow & Flutter and occasionally in power break-
down because of current over - load. Install the capstan mo-
tor while following the procedure given below.
(The capstan motor is centrally located when the unit is
shipped from the factory.}
{1} Provisionally tighten the three screws {A) securing the
capstan motor. :
{2} Install the mechanism assembly to which the capstan
motor is provisionally fastened on the bottom chassis
which incorporates the Main board assembly. (No need
to tighten the screws for mounting the mechanism.)
Make sure that all the connectors for the mechanism as-
sembly and the Main board assembly are correctly in-
stalled as indicated in Fig. 2-2-18.
Fig. 2-2-18
(3) Making sure that the connector CN3003 of the capstan
motor is correctly mounted, and securely tighten the
three screws (A).
Note: When the capstan motor has been re-
placed with a new one, perform record-
ing in the EP mode for at least 2 min-
utes at normal temperatures immedi-
ately before starting the FF/REW or
SEARCH operations (Aging).
2-11

2.2.9 Pole Base Assembly (supply or take-up side)
1, How to remove
{1} Remove the UV catcher 2 on the removal side by loos-
ening the screw (A).
{2} Remove the pole base assembly on the supply side from
the mechanism assembly by joosening the screw (B) on
the mechanism assembly back side and sliding the pole
base assembly toward the UV catcher 2.
(83) As far the pole base assembly on the take-up side, turn
the pulley of the loading motor to lower the cassette
holder because the screw (B) is hidden under the con-
trot plate. {See the “Procedures for Lowering the Cas-
sette holder assembiy” of 1.3 DISASSEMBLY/ASSEIV-
BLY METHOD.) Further turn the motor pulley to move
the cassette halder until the screw (B) is no longer un-
der the contro! plate lin the half-loading position). Then
remove it as done for the supply side by removing the
screw (B).
NOTE: After reinstalling the Pole base assembly and the
joy catcher2, be sure to perform compatibility ad-
/ justment.
eae
Screw(A) +—?
“UV catcher2
Fig. 2-2-19
2-12
2.2.10 Rotary Encoder
1. How to remove
(1) Remove the screw {A} and remove the rotary encoder
by pulling it up. (See Fig. 2-2-20.} i
Rotary encoder (Front side}
Screw(A) Guide marks
Rotary encoder {Back side) -
Positioning pin of the rotary encoder
Fig. 2-2-20
Contral plate
Shait of the rotary encoder guide
Fig. 2-2-21
2. How to install (Phase matching)
(1) Make sure that the mark E of the control plate is in align-
ment with the mark W of the loading arm gear shaft and
bring the guide marks on the rotary encoder into align-
ment as indicated in Fig.2-2-20. (See Fig. 2-2-20 and Fig.
2-2-21.)
{2) Turn over the rotary encoder with its guide marks kept
in alignment and install it by fitting on the shaft of the
rotary encoder guide and the positioning pin.
{3) Tighten the screw {A} to complete the installation.