Philips DCC170/00 User manual

Portable
digitalcompact
cassette
recorderDGCl70
Scrvlcc
Servlcc
Selvlce
t00t01t05t10/BK01
f DIGITAL
COMPACTCASSETTE
CONTENTS
SECTION PAGE
SAFETY
PRECAUTION
SPEC|F|CAT|ONS........... .................1
PRECAUTIONSFORMECHANISMANDHEADASSEMBLY
HANDLING.....................2
DISASSEMBLY
INSTRUCTIONS
4822725 24749
Published
byConsumer
Electronics
Printedin
the
Netherlands
@opyright
reserved
Subjecttomodification
PCS
79 261
PHILIPS

C SAFETY
PRECAUTIONS
lfnis
"safety
precaution"
is
applied
only
in
U.S.A.)
1. BeÍore
servicing,
unplug
the
power
cordto prevent
anelectricshock.
2. When
replacing
parls,
useonlymanuÍacturer's
recommended
components
íor
saÍety.
3. Check
the
condition
oÍthe
power
cord. Replace
ifwear
ordamageis
evident.
4. AÍter
servicing,
besure
torestore
thelead
dress,insulation
barriers,
insulation
papers,
shields,
etc.
5. BeÍore
returning
theserviced
equipment
to thecustomer,
besureto make
the
Íollowinginsulation
resistance
test
toprevent
thecustomerÍrom
being
exposed
toashockhazard.
OINSULATION
RESISTANCE
TEST
1. Unplug
the
power
cordand
shortthe
two
prongs
oÍthe
plug
with
a
jumper
wire.
2. Turn
onthe
power
switch.
3. Measure
theresistance
value
with
ohmmeter
between
the
jumpered
AC
plug
andeach
exposedmetal
cabinet
part,
such
as screwheads
antenna,control
shaÍts,handle
brackets,
etc. Equipment
withantenna
terminals
should
read
between
3MO
and5.2MO
to all exposed
parts.
(Fig.
A) Equipment
without
antennaterminals
should
read
approximately
inÍinity
toallexposed
parts.
(Fig.
B)
Note: Some
exposed
parts
may thechassis
bydesign. These
will read
(Frg A)
Resrstance = 3Me-5 2MA
Anlcnnl
tcrminll
Ergoscd
mctal
gaÍl
1F
rg B)
Resrstance = Appror @Ergosed
molal
parl
4. lÍ the measurement
is
should
be repaired
and shock hazard. The equipment
be isolated
from inÍinity.
@ wARNTNG
RtttCs ancl
many other semt-conductoíS are
susceptrble
to electrostatrc
drscharges (ESD1.
Careless handling durrng íeparr can reduce híe
clrastrcally.
When repairrng.
make sure that you are
connected wrth the same potenttal as the mass
Oíthe Sel vra ê wnst wrSg wrth reSistance.
Keep components and tools also at thrs
potentral
@ ArrENnoN
Tous les lC et beaucoup d'autres
Seml-COnduCteurs
SOnt
SenSrbles
aux
deëharges statrques
(ESD).
Leur longevrtepouÍratt étre consrdérablement
ecourtee par le íart
qu aucune precautton n est
pÍrse a leur manrpulation.
Lors de reparattons. s'assurer de bren ètre relie
au meme potentrel
que la masse de l'apparerl
et
eníiler
fe bracetet sertt ct'unerésrstance cle
securtte.
Verller
a ce que les composants arnsi gue tes
outrls
que l'on uttltse
sorent egalement a ce
pctentrel
outsidethe specified
rechecked
before
it is f
imits, there is a possibilty
of a
returned
to thecustomer.
CAUTION
:
FOR
CONTINUED
PROTECTION
AGAINST
RISK
OF
FIRE,
REPLACE
ONLYWITH
SAME
ryPE 8OOmA,125VFUSE.
REFER
REPLACEMENT
TO
QUALIFIED
SERVICE
PERSONNEL.
@ wARNUNG
Alle lCs und viele andere Hatbterter
srnd
empÍindlich gegen etektrostatrsche Enttadungen
(ESD).
UnsorgÍaltige Behandtung bei der Reparatur
kann dre Lebensdauer drastrsch vermrndern.
Sorgen sredaírir. dass Sie im Reparaturíatl
uber eln Pulsarmband rnrt
Widerstand mlt dem
Massepotentral des Gerates verbunden srnd.
halten Sie Eauterleund HilÍsmrttel
ebenÍalls auí
dresem Potentral.
@ wAARscHUwrNG
Alle lC's en vele andere hatígeteiderszijn
gevoelig yoor electrostatrsche onttadingen
(ESD).
Onzorgvuldig behandelen tijdens repaíatre kan
de levensduur drastrsch cloenverrnrnderen.
Zorg ervooÍ dat u tr;dens repaÍatie via een
polsband met weerstand verbonden bent met
hetzelÍde potentraal als cte
massa van het
a9paraat.
Houd componenten en hulpmrddelen ook op
ditzelíde potentraal.
O AV'ERnMENTo
Tuttr tC e pareccht semt-condunon sono
sensrbrli
alle scanche statache
(ESD).
La loro longevita potrebbe esseÍe íortemente
ndEttS In caso dr non osseívazione della pru
grande cauztone alla loro manrpolaztone.
Durante te riparazroni occoíre qurndi essere
collegato allo stesso potenziale che quello detla
massa clell'apparecchrotramrte un braccraletto
a reststenza.
Assrcurarsi che i componenti e anche gli utensrli
con quali si lavoÍa stano anche a questo
potenziale.
PCS79 262

HANDLING
CHIP
COMPONENTS
GENERAL
Digital
compact
cassette
48 k{z, 44.1kHz,32 kHz
(selected
automatically)
16-bits,
linear
PASC
2-channel,
stereo
POWER
REQUIREMENTS
orsHouNT|No
V^CUUM
PISTON
SOLOERING .t22 395t00C2
r.9.
WELLER
SOLOER
TIP
PT.X
r g. A PAIR OF
,r^rrfu^f,
SOLOERING IFON
soLo€F
wfcK
C SPECIFICATIONS
DIGITAL
SIGNALFORMAT:
Tape recording system
Sampling
frequencies:
No.
oÍ quantizing
bits:
CodingÍormat
No.
of channels:
AUDIO
PERFORMANCE:
Battery
Recording
time
Playback
time
Recharging
time
External:
USA/Ganada
Europe
U.K.
Australia/New Zealand
Other
countries
MISCELLANEOUS
Ni-Cd
rechargeable
battery
Approx.
2.5hours
Approx.
2.5
hours
Approx.
3 hours
120V,
60
Hz
220
- 230
V,
50Hz
240V,50
Hz
230
- 240V,
50Hz
120/230
V,
50/60
Hz
DCC
Frequency
response:
Ís:44.1
kHz
Ís:48
kHz
Ís:32
kHz
S/Nratio
Dynamic
range:
Wow
and
Ílutter
Compact cassette
TrackÍormat:
Frequency
range:
S/Nratio
(CrOr):
TERMINALS
20Hz
- 20
kHz
+0.5dB,
-1
.5
dB
20Hz
- 22
kHz
+0.5dB,
-1
.5
dB
20
Hz
- 14.5
kHz
+0.5dB,
-1
.5dB
90dB
or
more
90
dBor
more
Quartzcrystal
precision
4track2-channel
stereo
20
Hz
-18kHz
50dBormore
Mechanism
Head:
Motor:
Tapespeed
GENERAL
36channelthin-filmhead
Brushlessrnotor
4.76cm/sec.
Dimensions(WxHxD):
Weight(incl.rechargeable
battery):
ACCESSORIES
111.6
x38.1
x99.8 mm
(43ls
x 1 1
lzx3 15lto
inch)
420
gr.
Line
output
(fixed):
outputlevel:
Phones
output:
max.
output
power:
DG
input:
3.5mm
jack
1.0
v (50
ko)
3.5
mm
jack
18
mW
+18mW
(16
Ct)
6.0
v
ln-ear
phones
Headband type
Remotecontrol
Rechargeable
battery:
Coaxial
digitalcable
Mainsadapter:
Carrying case
HiFi
connection
cable
Note:These
specifications
aresubject
tochange
withoutnotice.
IOUXTINO
c.9.A
PAIR
OF
TWEEZERS
SOLOER
OO5-0tmm
SOLOERING \ pRESSgR€
rRoN
\X\ |
SOLOERING TIME
( 3 rcc/rrdr SOLOER
O03-0.tmm
sBc3179
SBC3184
(only
forBK01)
sBc6270
sBc6434'
sBcl275
EIAHPLES
4
soloEFrNG PREcAuTlo
IRON
SOTOERING
IRON
-l- PCS79 263

PRECAUTIONS
FORMECHANISM
ANDHEADASSEMBLY
HANDLING
(1)
Connect
your
wrist
strapto the unit'sGNDor to thegrounding
postof a measuringinstrument
you
areusing.
To protect
the head
assembly
frommagnetic
or electrostaticdamage,
be sure
to wear
the wrist
strapwhenever
replacing
thehead
assemblyorhandlingthe
PC
boards.
(21
(3)
Resistor
(1
MO)
o When usingthe instrument's
GND terminal
for measurement,
insert
the powercord plug
so that itGND side is connectedto the
ground sideof the power source.
When
disconnectingtheheadFPCfromthe
MechanismP.C.B.,installa
shortingcliponthe
FPC
to
protect
it
frommagnetic
orelectrostaticdamage.
r Useaceramic
screwdriverforallhead
replacementandadjustment.
. Keepmagnetizedmetallic
screwdriversaway
fromthe headassembly,
as theymaydamage the
head'smagnetic
properties.
Ceramic
screwdriver
(HOZAN
D-281,
@No.0)
Measuring
Instrument
(Ex:Distortion
Factor
Meter)
t.
,. GND
terminal
.í
Wrist
strap
(Anti
- staticbracelet)
ShortinQ
clip
(
I
\
I
-:--l
Besure
to shortthisposition.
(Use
theshorting
clip.)
)I
I
)
a
I
I
L
Household
AC
Outlet
('@s-9è.
PCS79 264 -2-

c DISASSEMBLY
TNSTRUCTTONS
ReÍ.
No.
1Removal
oÍthe
bottom
cabinet
ass'y
@
Front
hooks Bottom
cabinetass'y
Intermediate
cabinet
1.
2. Remove
the3scrgws
tO - @1.
Lift
upthebottomtabinet
ass'y
in
the
directionoÍarrow
@,
and
push
itin
the
direction
oÍ
arrow
(9 torelease
the2Íronthooks. CIr'n-'(3pcs.)
e-@
M1.4
x2.5
Hooks
ReÍ.
No.
2Removal
oÍ the MAIN
P.
C.B.
Procedure
1.r 2Socket
(J802)
1.
2.
3.
4.
5.
Connector \9/
(JU01,
JU02)
Remove
the2 FPC
boards
(JU01
,
JU02).
Remove
a socket
ofbattery
terminal
wire(J802).
Remove
the4 screws
(O - @1.
Remove
the2 screws
(@, @). And
then
remove
therear
frame
panel.
Open
theintermediate
cabinet
in
thedirection
of
arrow
@.
Remove
the
MAIN
P.
C.B.
shiftingin
thedirection
ofarrow
@.
Removal of the FPC board
1. Push
the
upper
portion
ofconnector
in
the
direction
of
arrow
@, and
then
pull
the
FPC
board
in
thedirection
ofarrow
@.
Upper
porlion
ofconnector
)FPC
board
Ol*t* (1pcs.)
e
M1.4
x3.5
0--. (bpcs.)
@-@
M1.4
x2.5
-3
- pcsrg 26s

ReÍ.
No.
3Removal
of the intermediate
cabinet
Procedure
1.r 2+ 3Shafts
Hooks
1
2
3
Push
theopenknob
in
thedirection
oÍarrow
@, andthenopenthecassette
lid
ass'y.
Remove
the
2screws
tO, @1.
Stretchtheintermediate
cabinetin
thedirection
oíarrow
@, andthenremove
the2
hooks
ofthebaek
sidebracket
ass'yandthe 2shafts. Mecha.
hooks
While
stretching
the
intermediate
cabinet,release
the
2mecha.hooks,and
thenremove
theintermediate
cabinetin
thedirectionof
arrow
@. @rnr* (2pcs.)
O,@
M1.4
x2.5
Note: Be
surenot
tohook
theleaf
SWuptheintermediate
cabinet.
ReÍ.
No.
4Removal
ofthe
armass'y
Procedure
1+ 2+ 3
Arm
ass'y Mecha
cassette
guide
@
%@ (1pcs.)
C
M1.4x 1.5
(2pcs.)
@,@
M1.4x2
1. Remove
the
3screws
(e ^,
@).
Note: Check
the
projection
ofhead
blockholder
at
@ isin
the linkangleswhen
assembling.
ReÍ.
No. I
5 | R"moval
oÍthetopcase
ass'y
I
Hook
@' \(zpcs.)
O,@
M1.4
x2
SCREW
HEAD@
2.0
1.
2. Stretch
thehooks
(@),
andthen
remove
thetopcase
ass'y.
7@q
ft*
\ protection
k6 retainer
Hook
'-@
PCS
79266 -4-

ReÍ.No.
6Removal
oÍtheLCD
mold
cover
ass'y
1. Remove
the
4screws (O - @). (apcs.)
e^,@
M1
.4x
2.5
ReÍ.No.
7Removal
oÍthe
cassette
guide
spring
Procedure
7LCD
mold
cover
Cassette
guide
spring
1. Remove
the2
screws
(C ,
@).
2. Pull
out
the
cassette
guide
spring
in
the
direction
ofarrow
@
(2pcs.)
e,@
M1
.4x2.5
ReÍ.No.
8Removal
of the LCD
P.C.B.andthe switch P.
C.B.
Procedure
I
1+ 2+ 3 !
+ 4+ 5 I
+ 6+ 8 i
@@
LCDP.C.B.
@
1. Remove
the
6screws
(C - @). SwitchP.C.B. (6pcs.)
O-@
BTfTEI
.4
x2.5
Ref.No.
9Removal
ofthe
mechanism
chassis
Procedure
1+ 2+ 3
+ 4+ 5
.+9
Leaf
spring
1
2
3
Remove
the3screws
(O - @).
Pull
outtheleaf
springbyslantingit
asshown.
Lift
up
the
front
bracket,and
then
release
the
hooks.
Remove
itin
the
direction
ofarrow
@. s'rr* (3pcs.)
e-@
M1
.4x
2.5
Front
bracket
-s- pcsT9267

ReÍ.No.
10 Removal
oÍthemechanism P.
C.
B.
and
TAPElN/
SELECT
det.switch
Procedure
1.+2+ 3
r) 9+ 10 Mechanism
P.C.B. TAPElN/
SELECT
det.
switch
Shield
board
(0e1G) Det.
switch
Connector
1
2
3
4
5
Soldering (J101
'J
102'
J103)
Remove
the
FPC
boards
(J101
,
J
102,
J103).
Remove
theshield
board
(091G).
Remove
the
12
soldering
part_(2
solenoids,
6 motors,4 switches).
Remove
the4 screws
(C - @).
Remove
themechanism
P.
C.B.
Note: Be
sure
touse
acliptothe
terminalofthe
FPQ
board
which
isfrom
the
head
during
repair
inorder
toavoidthestaticelectricity.
(Be
surenot
todamage
atthe
connection
of
theTAPElN/
SELECTdet.
switch).
Release
the
2 hooks
of
TAPElN/
SELECTdet.
switch. CI"rrrn (4pcs.)
e^,@
BTfTEI
.4x2.5
ReÍ.
No.
11 Removal
ofthe
lock
lever
ass'y
Procedure
1+ 11 Hooks
^
1. Lift
up
and
pu
the
hooks
ofthe
intermediate
llit
outwith
the
pliers.
@
mold
in
thedirection
ofarrow
@
ReÍ.
No.
'12 Removal
ofthebattery
contactor
Procedure
1.r 12 Hoo
Aks Intermediatemold /
1. Liftup'
2. Push
fr
Battery
contactor
thedirectionof
arrow
@ andremove
hehooksoftheintermediate
cabinet.
the
inside
ofthe
intermediate
cabinet
om nit
in
the
directionofarrow
@.
PCS
79268 -6-

oHowto replace
the
mechanism
block
Themechanismblock
issupplied
withoutother
parts
asasemi-assembly.
Thehead
block
ass'y,motor
andbeltare
supplied
separately
Írom
the
mechanism
block.
lÍthemechanism
blockisexchanged
asareplacement
assembly,
Íollow
the
preparation
procedure
below.
Preparatlon
procedure
Removethehead
block
ass'y,motorandbeltfrom
themechanism
tobe
replaced
andreplace
those
parts
tothenew
mechanism
block.
(Refer
toFig.1and2.)
(Follow
the
procedures
inReÍ.
No.
9,
10in
theDisassembly
instructions.
ReÍer
to
pages
5
and
6.)
.
Head
bfock
ass'y
otor
tf
Mechanism
toberepaired
Fig.
1
Howto replace
thehead
block
ass'y
Thehead
block
issupplied
as
ahead
block
ass'y.
(Refer
toFig
3.)
The
head
and
pinch
rollerarm(L).(R)
aresupplied
together
in
the
headblock
ass'y.
The
pinch
roller
arm(L).(R)
is
also
supplied
separetely.
S
pring
3.
Remove
the
2washers.
4.
Remove
the
springsfrom
thehook. 5.
Lift
up
the
pinch
roller
arm(L).(R)
inthe
direction
ofarrow.
Mechanism
block
Fig.
2
o
oHowto replace
cam
gear
and
solenoid
Thecam
gear
andsolenoid
areincludedin
themechanism
block.They
arealso
supplied
separately.
o Howto remove
thehead
block
ass'yand
pinch
roller
arm(L).(R)
1. Follow
the
procedures
in
Ref.No.
1- 5in
the
Disassembly
instructions.
(ReÍer
to
pages
3and
4.)
2. Remove
the
2screws(
O ,
A )toremove
thehead
block
ass'y.
Pinch rolle
arm (L)
Head
block
ass'y
-7- PCS79 269

o Removal
ofthemotor
and
belt
1. Follow the
procedures
inRef.
No.1
- 10in
theDisassemblyinstructions.
(ReÍer
to
pages
3- 6.)
2.Remove
the2screws(
O,@
).(ReÍer
toFig.1.)
3.
Removethe
2screws(
O,())andtheÍixing
ptate,(ReÍer
toFig.
2.)
4.
Removethemotor
inthedirectionoíarrow.(ReÍer
toFig. 2.)
5.Removethe
beltfrom
themotor.(ReÍertoFig.
3.)
Fig.
1
o
BeÍor
installing
thebelt
tothemotor,insert
the
unmagnetized
sheet
totheclearance
between
chassis
and
lower
portion
oÍmotor,
and
then
push
the
upper
portion
ofmotor
inthe
direction
oÍarrow.
Putthe
beltinto
theclearance
between
upper
portion
ofmotor
and
coil
P.C.B.
(Refer
toFig.
4 and
5.)
Fig.
2
Motor
Belt
Unmagnetized
1
sheet
orsimilar
;material
Upper
portion
oÍmotor
Coil
P.C.B.
Lower
portion
of
motor
Fig.
a
4.Remove
the
1screw(
O )
5.Remove
thewasher.
6.Remove the
cam
gear
in
Fig.3
Stretched
Chassis
(
Thickness:
0.2-0.3
mm
)
o Removal
of
the
cam
gear
and
solenoid
1. Follow
the
procedures
in
ReÍ.No.
1
- 10
in
theDisassembly
instructions.(ReÍer
topages
3 - 6.)
2.Pull
outthe
bushing.
3.Remove the
trigger
lever.
Note:
Avoid
missing
thetrigger
lever
spring
when
removing
thetrigger
lever.
andthe
solenoid.
the
direction
ofarrow.
Fig.5
Trigger
lever
Trigger
lever
spnn9
Solenoid
Washer
Solenoid
PCS79
270 -8-

Switchlever
Mechanism
lever
O NOTE
FOR
ASSEMBLY
o Notice
Íorassembling
the
Mechanism
P.C.B.
o
Align
the
switchleverwith
mechanism
leverwhen
installing
the
Mechanism
P.C.B.
oNoticefor assemblingtheintermediate-
cabinet
o
Make
sure
thehooksinside
theintermediate
cabinetare
joined
tothemechanism.
When
installing
the
intermedi-
ate
cabinet
to unit.
o Notice
Íorassembling
the
Head
block
assembly
1. Unhook
the
pinch
roller
springs
(L)
and
(R)
on
thehead
block.
2. Fixthe
screw
thehold
piece
support
(R)
onthe
mechanism
block.
3. Interlock
anaxis
ofthe
hold
piece
support
(R)
byopening
thehead
block
50- 60"
tothemechanism
chassis,
and
keep
thecondition.
Donot
damage
tothe
pinch
roller
and
controllod.
4. Hold
thehold
pieces
support
(L)
with
thescrewbyusing
tweezers,
andtheninterlock
a hole
at
theLside
ofthe
head
block.
Additionally,interlock
a locating holeofthe
mechanism
chassiswith
a boss
atthebottom
ofthehold
piece
support
(L).
5. Fix
thescrew
thehold
piece
support
(L)
onthe
mechanism
block.
6. Hook
the
pinch
roller
springs
(L)
and
(R).
o Notice Íor
assembling
the
jack
ornament
and
switch
ornament
. Alignthe
switch
leverswithswitch
knobswhen
installing
theswitch
ornament.
Note:
BeÍoreinstalling
theswitch
knob,besure
tocheck
the
clawsfordeÍects
that
wouldrender
the
claws
unseryiceable.
(lÍ
awhite
linelikewhite
wax
onaclawisÍound,
the
claw
may
bebroken
when
installingtheswitch
knob.)
o Notice
Íorassembling
the
LCDmold
coverAss'y
o
Set
theswitchlever
tothemarker
ofswitch
P.C.B.
Theknob
lever
will
beengagedwhen
the
top
case
is
assembled.
.
o
Tocheckwhether
theswitch
woks correctly,
connecta
circuit
tester
acrossterminals2 and
I (see the
illustration),
andchecktoseethere is
aconductivity
when
theknob is
setto"right"
side
(viewed
from
front
side).
Switch
P.C.B.
dJ3U
t- Marker
o o o-fo oLLtr
Terminals
-9- PCS
79271

oNotice
for
assemblingthe
cam
gear
Triggerlever Cam gear
spnng
Triggerlever
1.Temporarilyinstall
thetrigger
lever
spring
on
trigger
lever.
5. Latchthe temporary
attached
triggerlever
springtotheboss.
6.Install the
bushingand
washer.
Triggerlever
9.Pull
thetrigger
lever
onetimein
thedirection
oÍarrow
@,
andthen
rotate
themain
gear
in
thedirection
ofarrow
@
.
10.Makesure
the
yoke
islocated
at
the
position"REV"
when
thecam
gear
is
ceased
rotating.
Shaft
(B Nsserlever
Cam gear
3.Rotate thecam
gear
towardtheposition
asshown
above.
4.Install
the
trigger
lever
totheshaft
(B).
. Confirmation
oÍ camgear
operation
Cam
gear-'
7.Rotate the
main
gear
in
thedirection
ofarrow
e ,and
then
thecam
gear
associates
inthedirecion
ofarrow
@.
8.Makesure the
yoke
is
located
atthe
posision"RVD"
when
thecam
gear
isceased
rotating.
Cam
gear
FwD,-[3ÏóFl++ REV
11
.Further,
pull
thetrigger
lever
one
time
in
the
direction
oÍ
arrow
@
,and
thenrotate
themain
gear
in
thedirection
oÍ
arrow
@.
12.Make
sure
the
yoke
is
located
atthe
position
"STOP"
when
thecam
gear
isceased
rotating.
Shaft
(A)
Install
thecam
gear
tothe
shaft
(A).
Bushing
Triggerlever
spring
Main
gear
@ e+sroP r+ REV
Maingear Main
gear
PCS
79272 -10-

C SERVICE
TOOLS
Required
Jigs,
Test
Tapes,
and
Measuring
Instruments
o Testtape
Part
No. Contents Use
sBc420
(4822
3e730071)
315H2:OdB,
3150H2:
-10d8
125H2,-16kHz:
-20d8
4.76cmls
250nWb/
time
conslanl3180ps
and120ps
0nWb/m
31SOHz 14kHz 1OkHz 12
SkHz 14k I
-10
dB ));i -n
dB )t )e -n
dB -20
dB À-a
5Os 3Os 60s 10s 10s los 10s 1
Playback
sensitivitycheck
and
adjustment
Highfrequency
response
check
andadjustment
Tape
speedadjustment
sBc438
(4822
3e530288) Mirror
tape Tape
transport
adjustment
9.6kHz
(48223e730264) Level
tape(DCC)
9.6kF{z:
OdB Recording
current
adjustment
(4822
3e7
30252) Blank
tape
(DCC) Recording
current
adjustment
o JigsandTools
(A)
MECHANTSM
ADJUSTM
ENT
Head
alignment .
adiusting-screwdriver h
(RZZ02s6)
(4822
395
s0452)
Ceramicscrewdriver
(Head
alignment)
(HOZAN
D-281,@No.
0)
(4822
3ss 504s1
)
Head
adjusting
jig
(ozz02o7) Y
(B)
ELECTRTCAL
ADJUSTM
ENT
Ceramicscrewdrrver
(HOZAN
D-281,
O No.
1.7)
(4822
395
50451
) \rI-
o Measuring
instrument
Oscilloscope Frequency
counter Digitalvoltmenter
(Dig.-vol.) Electronicvoltmeter
(E.V.M.)(AC/DC)
-il- PCS
79 273

o MECHANTSM
ADJUSTMENTS
(HEAD
pOStTtON
ADJUSTMENT)
o Disassembly
1. Remove
the
2screws
of
thearmonthe
cassette
lid
ass'y.
(Ref.
No.4
@,@
on
page
4.)
Remove
the3screwsof
thebottomcabinet
ass'y
andthen,
take
outthebottom
cabinet
ass'y.
(Ref.
No.1
on
page
3.)
Remove
the
LCDflexible
board
from
the
connector.
(JU02)
Remove
the
4screws
ofthe
Rear
protector
retainer
andopen
thecenter
frame.
Pull
the
cassette
lid
ass'y.
(Ref.
No.
2@,@,No.
5O
,@
on
pages
3
and
4.)
Insert
the
small
(-)screwdriver
into
aclearance
between
theLCDretainer
(R)
flange
and
the
cassetteholderin
the
mechanism
little
by
little,
andthen
remove
apin at
the
mechanism
side
(shown
onthe
rightfigure).
Remove
apin at
the
left
sideas
well.
Connect
theconnecter
(JU02)
with
theLCD
flexible
boardwhichisremoved
on
No.
3.
Press
theopendetecting
switch
with
an
adhesive
tape
and
hold
the
power
"ON".
Atape
isloading
without
any
interference
with
thecassettelid
ass'y.
Performhead
position
adjustment
after
disassembling
the
unittothe
point
shownonthe
below.
2.
3.
4.
5.
LCDretainer
(R)
flange
6.
7.
8.
9.
Ceramic
screwdriver
(Head
alignment)
(HOZAN
D-2981,
+No.
0)
Head
alignment
adjusting
screwdriver
(R220296)
o Name
ofadjusting
screw
Open
detect
switch
(Press
the
opendetect
switch
with
anadhesive-tape)
@ Headheight
adjusting
screw
(R)
Tape
guide(R)
Tape
guide
(L)
Head
height
adjusting
screw
(L)
PCS
79 274 - 12-

o LoadingHead
Adiusting
Jig(o,Z'Z:0207)
1. Load
the
headadjusting
jig(Q'Z.Z:0207)-
into
the
unit.
Head
adjusting
iig
(022.0207) Head Check
bar
o Power Connection
1.Plug
the
accessoryACAdaptor
(or
other6.0V DC
power
supply)
into
theunit's
DClN
jack.
2.Press
the
PLAY
buttonandthen
rotatethe
takeupside
reelfor
awhile by
hand.
- 13 - Pcs792Ts
(1)
TiltAdiustment
o
IÍ the head
tilts backward:
Head
Turn the @ tilt adjusting
screwclockwise
until
of the check
bar
(0:within +30'). the head
surface
is parallel
with the end
o
lÍ the head
tilts Íorward:
Check
bar Check
bar
Tape
guide
(R)
@
Tilt
adjusting
screw
Turn @ tilt adjusting
endof the check
bar screwcounterclockwise
until the
(0
: within +
30'
). headsurface
is parallel with the
Check
Base
guide(L)

(21
GuideHeights
Adjustment
. Adiusting
Guide
(L)
Insert
the
check
bar
into
tape
guide
(L)
as
shown
below. Tape
guide(L) Check
bar
Tape
guide
(R)
adjusting
screw(L)
Check
Rear
end bar
Tape
guide(L)
Lifted Turn
Q head
height
adjusting
-.-
?- screw
(L)
counterclockwise.
Vr
I+
II
' \Turn o headheight
adjusting
screw(L)cloclcwise.
Turn
@
head
height
adjusting
screw
(L)
bar
off thebase,
then
slowlyturn
the
parallel
andrests
onthe
base.
. Adiusting
Guide
(R)
Insert
the
check
bar
into
tape
guide
(R)
as
shown
below.
counterclockwise
to lift the rear
endof the check
screw clockwise
to lower the Íearend until it is
Tape uide(L) Check
bar
Tape
guide(R)
l-{eíad @Head height
adjusting
screw(R)
Turn
@ head
height TaPe
guide
(R)
aàiusÍng
sóie'"(Ëi
--- \Rear end
Gheckbar
\- -í Lifted
clockwise. - -r*t
Note:
Turn
@ head
height
adjusting
screw
(R)
clockwise
to lift
offthe
base,
then
slowly
turn
the
screw
counterclockwise
parallel
and
rests
onthe
base.
Becareful
notto lift
the
check
barendmore
than1.Smrn,
as
the
screw
may
loosen
completely
and
pop
out.
the rear end of the check bar
to lower
the
Íear
end
untilit is
Note:The
head
armhas
a slight
amount
of play. Make
sure
thattherear
endof the
check
bar
completely
rests
onthebaseafter
thescrewdriver
is removed.
Base
PCS
79 276 - 14
-

(3)
TapeTransport
Adiustment
Load
themirror
tape (SBC438)
into
theunitandcheck
tapetransportin PLAY
mode,Check
both
Íorward
andreversedirections. lf thetop
edgeof thetapeiscurled,remove
thecurlbyfollowing
the
stepsbelow:
Tapeguide
Tape FATG
side
view
Tape
hub
A curledtape
edge
will notoccur
at the bottom
@ of thetape
guide,
asthetape is pushed
up
alongaslope.
Check
for
acurledtape
edgeatthetop
@
of thetape
guide.
guide
O lfacurled
tape
edgeoccursonFATG
(L)
:
Turn
O head
height
adjusting
screw
(R)
clockwise
until
thecurlis removed.
Curling
(L
side)
Tape
Tape FATG
side
view X Adjustmentneeded
Tape
hub FATG
@lf acurledtape
edgeoccurs
onFATG
(R)
:
Turn
@
headheight
adjusting
screw
(R)
counterclockwise
untilthecurla
IS removed.
X
Adjustment
needed
Curling
(R
side)
Tape
Tape FATG
side
view
Tapehub FATG
@When
the relative
positioning
LR of the tapehub andtape
head
(tapeguides)
iscorrect:
(L
/R both
sides)
Tape
Tape FATG
side
view C
No adjustment
needed
Tapehub FATG
Aftercompleting
the aboveadjustment,runthetapeboth
forward
andbackwardto check
for a curled
tapeedge. lf it stilloccurs,repeat
step
O or @.
- ls - pcs Tg277
Note: Since
the head arm has a
differ beforeand afterthe
margin.)
slightamount
of play,
the degree
to
adjustment
screwdriver
is removed.which the tapeedgecurlswill
(Allow
a sufficientadjustrnent

O ELECTRICAL
ADJUSTMENTS
o Disassembly
1. Complete
disassembly
instruction
Ref.
No.1
on
page
3.
(Tape
speed
adjustment)
2. Completedisassemblyinstruction
Ref.
No.2on
page
3.
(Other
adjustments)
3. With
theunitdisassembled,
plug
the
accessory
ACAdaptor
(or
other
6VDC
power
supply)
into
theunit'sDClN
jack.
4. Connecta measuringinstrument
totheLINE
OUT
jack.
Note:
Use
the
in-ear
phones
for
audiomonitoring.
TP1 :Testland
Íorplayback
ITPJ2o2 | :Forrec
currentadj.
(C
SETvoltage
check)
Fig.1MAINPCB
(P503)
IR211 I :Reccurrentadj.(DCC)
l-El: Playback
leveladj.(Rch)
I R12?
l: Playback
leveladj.(Lch)
IRlíl :HighrJrqr"n.y
response
adj.(Lch)
I R152
|: HighÍerquency
responseadj.(Rch) ÍTPTI
lol :Forreccurrent
adj.
(RD
MUXlevel
check)
Fig.2MECHANISMPCB
(P103)
lTPoil :Forrec
currentadj.
(Read
lCAGC
cancel)
lRusil: Motor
speed
adj.
JMO1
JMO2
!!l*',los / I ffi'{ "É'o
[ | [ !.ruos
C)JM07JM04
PCS
79278 - 16-

(1) TapeSpeed
Adjustment
Caution
This
adjustment
can
be
made
only
in
the
(4)
Motor
SpeedAdjustment
mode
under
Factory
mode.
1. Setthemode
tothe
"Motor
Speed
Adjustment
Mode"
underFactory
Mode.
(Refer
topage
20.)
2. Play
backtheACCTest
Tape
(SBC420:
3150H2,
-10d8)
forward.
3. Adjust
RU51
untilthefrequency
counter
reads
3150H2.
Adiustment
Ta : 3150t1 SHz
Preparation Setup
Test
tape
and
toolrequired Measuri
nginstruments
required
1ACC
test
tape
(SBC420)
Ceramic
screwdriver
(HOZAN
D-281
,@)No.
1.7)
21. Frequency
counter Frequency
counter
Connect
either
L-chor R-ch.
4. Reverse
thedirection
oftape
transport
and
perform
the
same
check.
Gheck
Target: 3150
t30Hz
Note:
Four
digit
number
(hexa
value)
displayedonthe
LCD
is
avoltage value
ofRU51A/D-converted
bythe
microcomputer.
(2) Playback
Sensitivity
Gheck
Preparation Setup
Test
tapeand
toolrequired Measuringinstruments
required
1. ACC
test
tape
(SBC420) 1.Oscilloscope
2. Electronicvoltmeter
(EVM)
(AC
range)
Lch:
OUT
(LINE
OUT)
Rch:
OUT (LINE
OUT)
DCCl70
CheckProcedure
1. Play
backtheACCTestTape
(SBC420:315H2,0d8)
fonrvard.
2. Checkthat
the
line
outputlevels
onbothchannels
fallwithin
the
Íollowing
limits:
CheckTaroet: 450mV
tldB
3. Reverse
thedirection
oftapetransport
and
perÍorm
the
samecheck.
o lfitis
stilloutsidethelimits
after
realignment,
dothe
Playback
Sensitivity
Adjustment
described
initem
(3).
(3) PlaybackSensitivity Adjustment
Preparation Setup
Test
tape
andtoolrequired Measuring
instruments
required
1.ACC
testtape
(SBC420)
2. Ceramic
screwdriver
(HOZAN
D-281
,@No.
1.7)
1.Oscilloscope
2. Electronicvoltmeter
(EVM)
(AC
range)
Lch: TPl EVM
Rch:Tp2 (ACrange) Osciiloscope
Adjustment
Procedure
1. Play
back
the
ACCTestTape
(SBC420:
315H2,OdB)
forward.
2. AdjustR127
(L
ch)
and
R128
(R
ch)untilthe
test
landTP1
(Lch)
and
TP2
(R
ch)
levels
onbothchannels
Íallwithin
the
following
limits:
Adiustment
Tarqet:113mV
tl dB
3. Reverse
the
direction
of
'tape
transportand
perform
the
samecheck.
-17 -PCS
79 279

(4) High
Frequency
Response
Checkand
Adjustment
Gautions: a Be
sure
to
check
the
frequencyresponse
afterthe
head
assembly
isreplaced.
o lÍthefrequencyresponse
does
notfallwithin
the
limits,
perform
the
Íollowing
adjustment.
FrequencyResponseCheck
1. Play
back250H2,
-20d8and
12.5kH2,
-20dB
ofthe
ACCTestTape
(SBC420)
forward,
and
verify
that
theleveldifference
betweenthetwobands
iswithin
0
t 1dB.
2. Reverse
thedirectionoftapetransport
and
perform
thesamecheck.
AdjustmentProcedure
1. While
playing
back
250H2,-20d8oÍACC TestTape
(SBC420)
forward,measure
the
LINEOUT
levels
onbothchannels.Usethese
levels
asstandards.
2. Play
back
12.5kH2,
-20d8ofthesametesttape
foruvard,
and
adjustR151
(L
ch)and
R152
(R
ch)until
the
LINE
OUTlevelsareidenticaltothestandard
levels
obtainedabove.
AdjustmentTarget:
0í).5d8
o
3. Reverse
thedirectionoftapetransportand
perform
thesame
check.
Gheck
Target:
0t1.sdB
Preparation Setup
Test
tape
andtoolrequired Measuringinstrumentsrequired
1.ACC
test
tape(SBC420)
Ceramic
screwdriver
(HOZAN
D-281
,G)
No.1.7)
2. 1. Frequency
counter
2. Electronicvoltmeter
(EVM)
(AC
range)
Lch:
OUT
(LINE
OUT) Frequency
counter
Rch:
OUT(LINE
OUT)
DCCl70
(5) RecordingCurrentAdiustment
o Always
perform
the
adjustment
when
the
head
block
isreplaced.
1.
2.
3.
4. J11O:RDMUX
level
by
Oscilloscope.
Usethis
level
asstandard.
5. Next, changetheDCC testtapetoa DCC blank
tapeandsettheunittothe
recording
status.
(Record
music
signals.)
6. AdjustR211until
voltage
value
at
TP:J202shows
1
30mV^.
1
4}mVDC.
(Temporary
adjustment)
7. Play
backthe
music
signals
recordedin
the
step
6,
and
measure
the
voltage
at
TP:J110
again
(peak
to
peak
level).
Checkthis
level
andthestandard
level
in4,
tosee
their
level
difference
iswithin
0+100mV.
AdjustmentTarget:
0
t100mV
B. ff
the
value
is
outofthe
limit,repeat
steps
5 - 7.
. lf
the
level
ishigher
thanthe
referencelevel,
rotateR211
counterclockwisetodecrease
the
voftage
(C
SET)atJ202.
. lf
the
level
islower
thanthe
reference
level,
rotateR211
clockwise
toincrease
the
voltage
(CSET)
aïJ202.
9. Open
the
short-circuitatlands
of
TP01.
Caution:
For
each
head,
arecommendedrecordingcurrentexists
individually.
lf
this
valueis
not
adjusted
correctly,
the
RDMUX
value
doesnot
match
between
aself
recorded
tapeand
prerecorded
tape.Moreover,
if
arecording
is
madeata
deeplayerwith
ahighvalue,the
previous
recordscan
not
be
erased
when
anoverwrite
recording
is
madeatthatarealater.
As
aconsequencetheerror
ratewill
be
increased
atthat
area.
Preparation Setup
Test
tapeand
tool
required Measuringinstrumentsrequired
1. DCC
test
tape
(9.6kHz
level
tape)
2. DCC
blank
tape
3. Ceramic
screwdriver
(HOZAN
D-281
,ONo.1.7)
1.
2. Digitalvoltmeter
(Dig.-vol.)
Oscilloscope . Recording TP:
J2o2 Dis-vot.
(DC
range)
. Playback
TP: J202
(c
sET)
TP:Jl12
(RDSYNC)
TP:
J110
(RDMUX)
CHl :2V
lDlV,
O.Spsec/DlV
CH2
:0.5V/DlV, 0.SpsedDlV
* Triggerd
byCHl.
Press
the
STOPbuttontwicetoturn
the
unitOFF.
Short
lands
of
TP01.
(Refer
to
Fig.1
MECHANISM
PCB.)
Play
back
the
DCC
testtape
(9.6kH2,
OdB).
Measure
thatthe
TP:
J110
(peak
to
peak
level),
PCS79 280 - l8 -