Pioneer CT-F700 User manual

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TAPE DECK
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MODEL
CT-F7OO
COMESIN FIVEVERSIONS
DISTINGUISHED
AS FOLLOWS:
a
aThis
service
manual
isapplicable
to the CT-F7OO1D,
DlG.
]+:r9^t;iJ,î01:,'',rt-:-1':" manuar
is issued
"rlpp""aix. For
further
detairs
about
the
cr-F700/KU and KG,.refer
to the supprement.ry,n.i"rr"r
on page
6r. tarrs
aDout
the
PË:tîtfftairs' an'd
ordering
of sparep"rt , t"t" speciat
noteof the type (i.e.
cr-F70olD, DlG, 1
1.
2.
3.
4.
5.
6.
3
4
6
I
11
13
15
16
16
17
19
20
21
21
21
21
22
23
8.5 Recording
Current
8.6 Recording
Bias
8.7 Recording/playback
Frequency
Response
. .
8.8 Recording
Level
.
9. PACKING
10.
EXPLODED
VIEWS
10.1 Exrerior
1O.2 Mechariism
Assembly
(Front
Side)
10.3 Mechanism
Assembly
(Rear
Side)
10.4 FrontPanel
10.5 Panel
Stay
10.6 Mother
Assembly
11.
SCHEMATIC
DIAGRAMS,
P.C.
BOARD
PATTERNS
AND PARTS
LIST
11.1 Miscellaneous
parts
List
11.2 Connection
Diagram
11.3 Schematic
Diagram
11.4 Mother
Asserirbly
11.5 Muting
Assembty(RWX-192)
11.6 Dotby
Assembty
(RWX-t9t
)
11.7 Amptifier
Assembly(RWF_084)
11.8 Control
Assembly
(RWG_O85)
11.9 Meter
Amptifier
Assembty
(RWX-lg5l . . . .
1
1.10 Power
and
Oscillation
Assembly
(RWR_061)
.
. ..
11.11 Connection
Assembly(BWX_196)
26
26
26
26
28
29
31
33
35
36
37
38
39
4l
43
47
49
50
53
56
rE-
_i.
x
25
25
25
26 Additional Service
Manual
58
60
61
Type Voltag€
J
20V only
120V
onty Canada
model
Europe or Oceania
model
KU
KC
HG 22OV and24OV (switchable)
12OV,22OV
and 240V (Switchabte)
12OV,22OV
and240V (Switchabte)
D
D/G
CONTENTS
SPECIF
ICATIONS
FRONT
PANEL
FACILITIES
DISASSEMBLY
PARTS
LOCATION
. .
LEVEL
DIAGRAM
CIRCUIT
DESCRIPTIONS
6.1 Recording
and
playback
Circuit
6.2 DolbyProcessor
6.3 Oscillator
Circuit
6.4 Muting
Circuit
6.5 Control
Circuit
6.6 Meter
Circuit
7. MECHANICAL
ADJUSTMENTS
7.1 Pinch
Roller
pressure
7.2 Reel
Turntable
Torque
7.3 Tape
Speed
7.4 pause
Timing
7.5 Motor
Switch
and
play
Timing
7.6 Muting
Switch
Operation
7.7 Wow
andFlutter
8. ELECTRICAL
ADJUSTMENTS
8.1 HeadAzimuth....
8.2 playback
Equalizer
8.3 playback
Level
9.4 Level
Meter
and
D.L.
Meter
.

q
l-
{'
I
1. SPECIFICATIONS
Systems Compactcass€tte,2-channel
stereo
Motor Electronically-controlled
DC motor
{built-inSenerator)
x I
Heads "Ferrite Solid" recordinS/playback
Signal-to-Noise
Ratio
head
x 'l
Ferriteerasing
head
x 1
Approximately 85 seconds (C-60
tape)
No more than
o.o5%
(wRMS)
No more than
10.17%
(DlN)
Standard,LH tapes:25
to 15,000H2
(30 to 14,000H2 t3dB), (40 to
13,000H2DIN)
Ferrichrome
tape: 25 to 17,000H2
(30 to 16,000H2
+3dB)
Chromium dioxide tape: 25 to
17,000H2
(30 to 16,000H2t3dB),
(40
to 14,000H2DIN)
Dolby
NR OFF: Morethan
54dB
Oolby
NR ON: More
than64dB
(over
5kHz,
standard,
LH tapes)
(When chromium dioxide tape is
used,signal-to-noise
ratio is further
improved
by 4.5d8 over5kHz)
Morethan58dB
(DlNl
Harmonic
Distortion. No morethan
1.5%
(0dB)
Inputs
(Sensitivity
lMaxi
mum allowableinput/lmpedance)
MIC (L, R); 0.3mmV/l00mV/10 kilohms,
6mm diam'
jacks(Reference
MICimpedance;
25Oohmsto l0kilohms)
LIN
E (2-channel
stereo)
;
64mV/25Vll
00 kilohms
REC/PLAY
x 1
;
lnput& output,
l4mV/4.5V/l.8 kilohms
5p
iack
(OlN standard)
Outputs(Reference
level/Maximum
level/Load
impedance)
Ll
NE (2-channel stereo);
450mV/7
I
0mV/50
kilohms
REC/PLAY x l; 450mV/7l0mV/50 kilohms 5p iack
(DlN standard)
Headphones
x l; 60mV/l00mV/8 ohms,6mm
diam.
iack
5em
iconductors
Amplifier Section
Motor controlsection
Subfunctions
. Meter
f Dynamic
levelmeter:
for recordingl
I Bi"r rn.t"tt for recording I
t Peak
meter:
for Playback )
o
Biasadiustment
systcm
e
Input
selector
(LINE/MlC'DlN)
. Memorystop
(ON/OFF)
r Dolby system
(ONOFF) with indicator
lamp
. Tape Selector(STD/FeCrlCrOr )
Automatic tape selector
for CrOr tape' and Manualtape
selector
of independently
BIAS/EQ
o
Cassette
compartment
illumination
Power
Requirements
. . . AC l2OV, 22OV, 24OV (switchable)
50l6OHz
Transistors x 35 lCs x 4
Diodes
x 51
Transistors
x 3,Diodes
x I
2l watts
a20(w)
x 187(H)
x 304(D)mm
Max.
16-9116
x 7-318
x l2 in
8.5ke
(18
lb l2oz)
l0.2kr
(22|b
8oz)
cT-F7c',C,
Furnished
parts Stereo connecting cord with pin
plugs
x 2
HeadcleaninS
kit x 1
Fuse
(120V; lA or 220,240V 500mA)
Operating
instructionx I
NOTE:
Specificdtioru ond the design .ubiect to Po.tlble modificdaion
uithout notice due to improuement..
NOTES:
l. ReferenceTaoes:
Standard
& LH: DIN 45513/BLATT6 or
eoulv.
: CrOr: DIN
45513/BLATTT
(CrO')or
equiv.
2. Reference
RecordingLevel: Meter 0dB indicating
level(160
nwb/m magnetic
level
= Philips
cassette
reference
level)
3. ReferenceSignal:333H2
4. Wow & Flutter: o J15 [3kHz, with acoustic
compensation
(weighted),
rms valuel o DIN [3150H2,
with acoustic com-
pensation
(weighted)
PEAK
valuel;DIN 45507
5. Frequency Response: o Measured
at -20d8 level, DOLBY
NR OFF, level
deviationis
i6dB without indication
o DIN is
DtN 45500
6. Signal-1o-Noise
Ratio: r Measured
at +4dB level
(250nwb/m
magnetic fevet = DIN 45513 specifiedreference
level), IEC A
curve with acoustic
compensation
(weighted) o DIN is DIN
45500
7. Sensitivity:Input level
(mV) required
for reference
recording
level
with input (REC)controlsset
to maximum.
8. Maximum Allowable lnput: While decreasings€ttings
of ingut
(REC) levelcontrols and increasinS
level
at input iacks,
thisis
the maximum input level(mV) at the point whererecordinS
amplifier
output waveform
becomes
clipped.
Reference
Output Level: Playbackoutput level
when meter
indicates
0dB.
Maximum Output Level:
Playback
output level
with respectto
reference recording level when output (PLAY) level controls
are
setto maximum.
Unit:
mm
420(w)
x 187(Hl
x3ût(Dl mm
Max.
Fast
WindingTime
Wow
andFlutter
Frequency
Response.
Power
ConsumPtion
Dimensions
Weight .
t0.

3. DISASSEM
BLY
Exterior Parts
1. Remove screltrs
Q thru @, and remove the
bonnet.
2. Remove knobs A and B, remove screws@ thru
@ fastening the front panel to the chassis,
and
remove the front panel. Be sureto unhook the
door spring from the adjusting
hole; otherwise'
the front panel cannot be separated from the
chassis.
3. Remove screws @ thru @, and remove the
bottom plate.
Disassemblyofexterior
parts
Front
panel

2. FRONTPANEL
FACILITIES
R SWITCH
The power
comeson when the POIVER switch
is
depressed
The
levelmeters
andtheremainingtape
display
liShtwill then light up.
To turn off the power,
releasethe
switch
by depressingit again.
TTEDOOR
OPEN
BUTTON
Depressthis
button to openthe cassettedoor To close
thedoor,
Press
it lightlyand
close.
CASSETTE
DOOR
Alrvays keep this door closed
to prevent dirt and dust from
adhcringto theheads€ction
androtating
parts.
OPERATING
REC bvcr: To
together.
LEVERS
This lever will not work when a cass€tteisnot loaded or when the
erasure
prev€ntion tabs of a loaded cassette
have been broken off.
Ravind hvor ( *rl l: Depress this lever to rewind the tape (the
tape will travel from right to left at high speed).
Plry læer I ) ): Depress this lever when playing back a tape.
Depressit together with th€ REC leverfor recording (the tape will
travelfrom left to right).
Siop lever (ll: When this lever is depressed during tape play,
the operating leversin use will be releas€dand the tap€ will stop.
Frst forwsrd lever ( }} ): Depress this lever to send the tape
forward at top speed
(the tape will travcl from left to right).
PAUSE hvrr: Depress this le\€r to stop th€ tape temporarily
during recording or playback. When it is released,the tape will
continu€ to travel as before. This lever is also deDressed for un-
attended recording wh€n thc casJ€tre
deck is being used togethcr
with a timer.
NOTESI
I. Apdrt frcm the pby ond REC leuera. Do not depress ony of
the leverc simuataneoul!.
2. The opemtinl teuen witl ^ot return to their originol po.itioB
euen when the pouer iscuitched QFF.
record,depressthis lever and thc play lever
DYNAMICLEVEL/BIAS
METER
Dynrmh l.y.l m.te?: When setling the recording level, you will be
able to record any program source at the c.orrect recordint levcl
if you edjust this meter s that the pointer does not deflcct morc
than +6dB with rcspect to a peak siSnalof the proSram source
even if the level meter pointcr defl€cts up to +3d8.
This meter servesat a peak metcr during playback
8iæ metor: Use this meter to adiust thc bias in accordance with
the characteristicsof the tÀpe beinS us€d. Meter indication is in
percent.
LEVELMETERS
Theseindicatethe input levelduringrecordingand the output
level
during
playback.
PHONES
fACK
This is the output iack for stereo
headphones.
Us€it when
you
wantto monitorthe
quality
of a recordingor if youwant
to listen
to atape
priYately.
lvoîES..
. Uselou-impedonce heodphonet I1 you uæ o hilhJmpedance
model,
you uill not be
qbte
to obtoin tufficient wtume.
. you con domage the micrcphone if you plug it into the
PHONES
jochmittohenly,
Mrc
,AcKs
These
are
the inputjacks
for microphone
recording.
Plut thc left
channel microphone into L and thc righr channel microphone
intoR.
TPUTLEVEL
CONTROLS
Use them to ad,ust the output signal level during playback.
Turning the control to the right incr€as€s the levcl. The cont(ols
are coupled when turned but it is also possible
to adiurt th€ right
channel (rear) and left channel (front) independently.
INPUTLEVEL
CONTROLS
Usethem to adiustthe input signal from the MIC iacks
andthe
rear
panel
INPUT
lacks,
andDIN connector
Turning the control to the right increases
the level.
The controls
arecoupled
to the left andright
channelsalthough
you canalso
use
them to adiust
the right channel
(rear)
andth€ l€ft channcl
(front)independently.
I
.\-/f- .r"
n .o1
ô"ô
5€æO C€ÎrC
4

EC
INDICATOR
This light comes
on when the play and REC levers
aredepressed
together to indicate that the cassette
deck is now set to the
recotdinE
mode.
DOLBY
NRINDICATOR
This light comes
on when the DOLBY NR switch issetto ON to
indicate that the cassettedeck is now set up for Dolby recording
or Dolby playback.
CrOzINDICATOR
This light comeson when a chrometape is being used.
lt will
come on when a cassetteisnot loaded
but this does
not indicate
a
failure.
Fe{r INDICATOR
This light comeson when the EQ switch issetto Fe{r.
METER
SELECTOR
SWITCH
Set thisswitch to DYNAMIC LEVEL when
you wanr
to make
use
of the dynamic level
meter,and to BIAS when you want to use
thebiasmeter.
BIASCONTROL
Use
this control to àdiustthe biasin accordancewith thecharac.
teristicsof the tape beingused.lt issetsothat the centerposition
(center
click)
correspondsto thestandard
bias.
EQSWTTCH
Use this switch to sclectthc recordingand playback equalization
characteristicsin accordance with the tygeof tapebeingused.
STD: For ordinary tapesand low-noise/highoutput rapes.
FeCr'. For ferrichrome tapes.
NOTE:
Therc b no need to opemte thilrlaitch ûfyou are usinga chrome
aape slnce the bi.rt ond equorlzer orc tetected, outomaticatly by
the bui t.in mechonhmc, Mohe aure tt'Æ,t
lour chrome tape has
d'etectbn hobt, The chrome tspe d.tector uill not worh uith
chtome topet uhich are not equipped wlth these detectton
hobe, and a thb type of tape connot be uæd.
GT-F7OO
TAPE
COUNTER
Thisindicates
theposition
of thetape
run.
TERRESET
BUTTON
Depressthis button to reset
the tepe counterdisplay to ,000'
MEMORY
STOP
SWITCH
When this switch is depressed
to the ON position, the position
the tepe counter is s€t to'000'is memorized
during recording
and playback,
and the tape
canbe stoppedwith this memory.
DOLBY
NR
SWITCH
Set this switch to ON for recording with the built.in Dolby noisc
reduction system and for the playback of tapeswhich havebeen
Dolby-recorded.
INPUT
SELECTOR
SWITCH
Usethis switch to selectthe program sourcewhich you intend to
record.
LINE: Set to this position for recording a program source
which isconnectedto the rearpanel
INPUT jacks.
Set to this position lor rccording signalsfrom a micro-
phone which is connected to the MIC iack or rear
panel
DIN connector,
NOTE:
I1 mlcrophones are connected to front pone,MIC iachc,a.ource
connectedto DIN connector connotbe recorded
+ Dolby and [Tl aretrademarks
of Dolby Laboratories.
h
o
,,. ,Æ [Ec*
cl.fru
@t0-il@
&cÙ CO 1r$b
o

5. LEVELDIAGRAM
PLAYBACK
FLAÏ AMPI
Goin
32dB
FLAT
AMP
2HIADPHONES
AMP
Sz REC
--------o
OUÏPUT
VR
, ,
-5dBv
i (0
56v)
VR
Loss
53d8
LINE
OUT
25d8v
(t33v)
0dBv= lV
Frequency
, 333
Hz
-7.7
dgv
(04rv)
RL=
æ
-4
d8v
(0 63vl
RL:8N
-23
dBu
l707nvl
@
E
J
U
U
J
a
a
ô';;r LrNE,ouT
-l
3dBv
(0 22v
I
i
-3Z3d8v -43dBv
(t3
6mv; (7tmv)
-33
TdBv
l207nv
-77
3
dBu
(
0
t36
mV)

RECORDING
FLAT
AMP
1
-lldBv
(
0.28v
)
OOLBY
NR
i-7.7
dBv
t(0.4
tv
)
RECAMP
FLAT
AMP
2
|
-5d8v
i
(
0.56v
)
{ nrc
reao
HEAOPHONES
AMP
LINE
_
Mrc Ër
t'
I
2.5dBv
(
r.34V
Goin
7.5dB
Goin
8dB LINEOUT
-7
dBu
(
0.45v
)
; -20
cE)
E
J
U
4
J
RL=
8O
-23
dBv
(70.7mv)
-
33.7
dBv
(
2O.7nY
)
- 43dBv
(z.tmv)
0dBv
= lV
Frequency
: 333 Hz
-31
ZdBv
( 27,5nVI
-35.5d8v
( 16.8
mV)
-365dBv
( 14.9mV)

4. PARTS
LOCATIONS
Front Panel
View
Front
panel
assembly
RXX-221
Knob
(METER,
BIAS,
RAA.2O9
Level
meterassembly p
RAW.O74
Level
meter
assembly
RAW-O7O
RAA.2O7
EQ,
DOLBY
NR,
INPUT}
Button
A
RNK.332
Variable
resistor
(
I
NPUT)
RCV-045
Variable
resistor
(OUTPUT)
RCV.046
Jack
assembly
RKN.O4O
Rotary
switch
(DOLBY
NR)
RSB-018
RNK.335
Button A
RNK-332
Button B
RNK-333
Button C
RNK-334
Front View with Front panel
Removed
Lamp
assembl
B
E
L.056
Cassette
plate
RAH.O2O
Rotary
swi
(METER,
EO,
RSB-017
Erasing
he
RPB-014
PB/REC
he
RPB-032 votume
{glASl
Rcs.o76
Power
cap
RAc.06e ---,-t +
ButtontJ

cT-F7oc,
r andoscillation
assembly
RWR.061
Muting
assembly
RWX-192
ifier
assemblv
RWF-084
assembly
RWX-191
ide
switch M
RSH-03O
ide switch
RSH-027
byassembly
RWX-191
Amplifier
assembly
RWF-084
Meter
amplifier
RWX-195
RNA-321
Linevoltage
selector
(switchable
3 positions)
RKR-O2O
cord
RDG-o19
I
op View with BonnetRemoved
rwer
transformer
ïr-132
)apacitor
0.01pF
43-003
iontrol assembly
iwG-085
earPanelView
njackassembly
KB-013

Button Replacement
The buttons are bonded to the switches. To
remove the buttons, heat the lever of the button
to be removed, with a hair dryer or other similar
device,
and then pull the button off.
Tape-lndicator Lamp, Reel Turntable and Belt
Replacement
1. To replace the tape indicator lamp, first loosen
screws
O and
O, and removethe cassette
plate.
2. Then unsolder the lamp leadswith a soldering
iron, and replacethe lamp.
3. Remove screws |$ ttrru @, and remove the
supply reel tumtable full ass'y.
Then, removescrews
@ thru |@,
andremovethe
take-upreel turntable full ass'y.
Both the supply
and take-up reel tumtables are supplied as
assembly.
4. Remove the flywheel ass'y to remove the
capstan belt, being careful not to lose the oil
washer.Never get any oil on the capstan.Both
sides of the belt are polished, and either side
can be the front or back.
Soldering
iron
cT-F7o,C,
Mechanism
Ass'y
After removing the front panel, remove screws
O ttrru @ at the front and screws
@ and @ at the
top, and remove the mechanismass'y.
Mechanismass'y
Remaining
tape-indicator
lampass'y
Supply reelturntable full ass'Y
Lamp
Vinyl
tube
(blue)
Ïake-up reel
turntable full ass'Y
@',
Oil
washer
teplate
Fig.2 Button
replacement
Removemechanism
ass'y
Fig.
4 Tape
indicator
lamp.
reelturntable
and
belt
replacement

Equalizer/microphoneamp.
(FiS.
11)
The microphone amp section of the PA4001 is
used. Its input is a differential amplifier, and its
output is an emitter follower type. Whenrecording,
this circuit is used as a flat frequency response
microphone amp by switching the NFB circuit. At
playback, it is usedasa playback equalizer amp by
making the NFB circuit a time constant circuit.
The playback equalizer amp is switched between
CrOz, Fe-Crand STD. At CrOz, Fe-Cr,
a CR series
circuit is inserted at the output side of the
equalizer amp by a transistor switch.
When a cassette half having a chrome tape
detector hole is loaded (CrOztape detector switch
Ss
at the HOLE position),or the EQswitch S+isset
to the Fe-Cr,
CrOz position, +B issuppliedthrough
the route Dzoeor Dzos
> F.zzt
> 3tt3 r Qror
.
Since Qror is tumed ON by cancelling
of -B, the
amp is made a CrOz (Fe-Cr)equalizeramp (time
constant ?Opsecat the high range) by Caoaand
Rarr.
When a cassettehalf not havinga chrome tape
detector hole (Ssat the NO HOLE position) and
S+is set to the STD position, +B is not supplied
to Qror and Qror is tumed OFF by -B (time
constant 120psecat the high range).
Recordingbiasswitchingcircuit (Fig.12)
The recording bias is switched between CrOu
and Fe-Cr, and STD. The bias current is switched
by changing the oscillation width by changing the
bias oscillator supply voltage. The bias current
can be varied fuom -LiVo Lo +lo7o for CrOz and
from -2O7o to +157o for Fe-Cr and STD, by
adjustingthe biasfine-adjustment semifixed resistor
VRzoz.
At the center click position, the reference
bias OV" of the set is indicated at the THIRD
METER (BIAS meter).
When a cassette half without chrome tape
detector hole is loaded (CrOzdetector switch Ss
at
the NO HOLE position), at recording power is
supplied to the oscillator circuit through the route
Rzzr
andSs'Dzos > Rurs'VRzoz. Since
theseries
with Rzzswhen a cassete
half vrith detector hole is
loaded (Ss at the HOLE position), the voltage
supplied to the oscillator circuit becomeshigh.
When VRzozis at the center click position, the
CrO2 recording bias becomesapproximately 20Vo
to 30Vo
deeperthan for STD/Fe-Cr.
The recording biasisindicatedon the biasmeter
by setting the THIRD METER switch Sroto the
BIAS position. VRzosis for "0" adjustmentof the
STD/Fe-Cr bias indication, and VRzoq
is for "0"
adjustment of the CrOz biasindication. Quor
acts
as a switching transistor which mutes the THIRD
METER when the REC/PB switch Szis set to the
PB position and the MUTING switch Sz is set to
the ON position.
?
STD
RJI]
CJoB
0
lot
+81
ro
s?
lltL
REC/PBhead
Sr: REC/PBswitch
Ss
: CrO2lapesenseswitch
Sro: THIRD METER swilch
i||th-r rNpJrvR
# r,r're
f,
Mlc llvl Equàr,ze,/ r,4rc
f IREC mrc.ophone
amp
'rc-
PR
S,. REC/PBrwirch
S.: EQswirch
St: CrO, taæ sense switch
56 INPUT switch
5z
Fig.
11 Equalizer/microphone
amp
circuit
HOL
E
rr i:#*'riib-
Fig. 12 Recording
biasswitching
circuit

HeadReplacement
PB/REC
head
Remove screws
O and @, and disconnect
the
PB/REC head wiring, being careful not to lose
the head adjusting spring. Be sure to adjust the
head azimuth after replacing the PB/REC head.
Refer to the electrical adjustmentitem on page
24
for details.
Erasinghead
Remove scre\fls
@ andQ, remove the lead clamp,
and disconnect the erasing head wiring.
Pinch
arm
Remove the E-washer and nylon washer, and
remove the pinch arm, while pushing the pinch
pressure spring downward.
Pinch
pressure
spring
Erasing
head
Leadclamp
SubchassisandMotor Bracket
Whenreplacing the capstanmotor, first removethe
subchassis.
1. Remove screwsQ thru @, and remove the
subchassis.
2.Removescrew
@,
andremovethemotor bracket.
3. Remove screws @ thru O, and remove the
capstanmotor.
Su
bch
assis
Fig.
7 Remove
subchassis
andmotor bracket
Door
Remove
the two door-shaftstoppers,
and remove
the door from the escutcheon.
The front panel is
attached to the escutcheon with double-sided
adhesive
tape.
Door
Door shaftstopper
I
n'S I
I
o
PBlREch-d
f{
H"aoaoiusti.isp:2fu
Pinch
aim ]"^u'=-on
washer
E-washer
Fig.
5 Headreplacement
MeterLampReplacement
1. Remove the tape and meter coversealing
tape.
2. Replacethe meter lamp, usinga solderingiron.
Be careful not to touch the scale plate and
pointer with the soldering iron when replacing
the meter lamp.
Metercover
Sealing
tape
Fig.
6 Meter lamp
replacement
. Tape
Tape
,,
/b
a/
9-\
Capstanmotor
Fig.
8 Doorreplacement

cT-F7clcl
6. CIRCUIT
DESCRIPTIONS
Input
Lêvel
Conlrol LevelMeler
LINE
0uT
REC/P8
Heod
52
: REC/P8
SELECÎORPB
_ REC
SC
: INPUT LINE
- MIC
Fig.9 Block
diagram
The circuit construction of the set is shown in
the block diagram, and the circuit schematic is
shown on page 41.
6.1 RECORDING AND PLAYBACK
CIRCUITS
The special tape deck system IC (PA4001)
developed by Pioneer is used in the recoridng and
playback circuits. The PA4001 is a 16-pin dual-in-
line IC containing a microphone amp, recording
amp, and headphone amp. Its block diagram is
shown in Fig. 10.
Flat
amp 1
The flat amp section of PA4001 is used. This
amp ha.sa flat frequency response, and boosts
the equalizer amp output at playback and the
microphone output or LINE input signalat record.
Flat amp 2 (Qcotl
This amp has a flat frequency response,and
amplifies the output of the Dolby processor.
Headphone
amp
The headphoneamp section of the PA4001 is
used. This amp is a headphone and level meter
drive complementary amp, and has a gain of ap-
proximately 7.5d8. The headphone output is
divided bV resistors.
,, rN our
IN OUT IN
Fig.
10 Blockdiagramof P44001
Fl
ot
Anp 2
OUT

AUTO
STOPoperation
(Fig.
17)
1. When the tape stops running, the base voltage
of Qzol remains constant and the its collectorr
voltage also remains constant, as shown in
Fig.
1? @.
2. Since the change in the collector voltage of
Qzor is taken from Czocand rectified by Dzo:
and Dzo+,no output voltage will appear when
the collector voltage is constant.
3. Therefore, bias to Qzo:is removed, and Qzo:
is
turned OFF.
4. When Qzo: is turned OFF, C.roo
proceeds to
charge and the an{u voltage of Dzoa rises as
shown in Fig. 17 (D.
5. +Bz is divided by Rzzr and Rzzoand applied
to the anode of Dzoa, and since this anode
voltage rises further, Dzoa conducts.
6. Therefore, bias is applied to Qzoa, Qzo+is
turned ON, a voltage drop is generated across
Rure,and Qzos
is also tumed ON.
7. Consequently, blas is applied to Qroz, Qroz is
turned ON, current flows through the route
*Bz > Su t Durq t solenoid r euot ground,
and the mechanism is released (placed into the
STOP state) by the solenoid.
8. When the tape is stopped in the REW (FF)
state, current flows through the route *Bz ,
S't
r Dzrs
r solenoid
+ eror r glound, because
Sz is at the ON side, and the mechanism
is
released
by the solenoid.
Since this route does not pass
through the
PAUSE
switch Se,auto stop isperformed
even
if the PAUSE button is pushed.
9. Since Sa is switched to the OFF side when
the mechanism
is in the STOPstate,eror is
biased
through
theroute+B: ' Ss
, P,tzg
' ero:,
andQzor
istumed ON.
10.Therefore, the anode voltage of Dzoa
drops,
Qzo+,,Qzos
and Qzoz
are turned ON, and the
current flowing through the solenoid is inter-
rupted.
l1.'When the PAUSE button has beenpushed
in
the PLAY (REC) state,Se
is switchedto the
ON side, and Qro: is biased
through the route
+Bz
+
Sz, Rtzot Dzror
Sst Dzrz
t Rzrot Dzos.
Rzrz' Qzoa
and Qzo.l
is turned ON.
12. Consequently, Quoa,
Qzos,
and Qzor remain in
the OFF state, even if the tape is stopped.
13. When the PAUSE button has been pushed in
the FF (REW) state, the route of item 11
above is not established, Quo: is turned ON
and OFF in accordance with running of the
tape, and the auto stop circuit operates
normallv.
S- MUTING sw,rch
S. MOTOR sw rch
I
I
I
I
Fig.
17 Control
circuit
J;
Srrr
18

Recording
amp
(Fig.
13)
The recording amp section of the PA4001 is
used. Its input is a differential amp, and its output
is a complementary circuit. A low-rangecompen-
sation circuit is provided in the NFB loop, and
a recording bias trap is provided in the output
circuit.
The high range peaking characteristic can be
switched between CrOz, Fe-Cr,and STD by three
NPN transistor switches.
+B is suppliedto the baseof Qror,Qro+,
or Qros
by the tape position determined by the CrOz tape
detector switch Ssand EQ switch S+,
-B is cancel-
led,andthe appropriatepeaking
circuit is operated.
The peakingfrequencyisapproximately 14kHz for
STD, and approximately 15kHz for CrOz and
Fe-Cr.
Recording
amp
Dolbyprocessor REC/PB head
cT-F7c,c,
scribed level (Dolby level) at the mid'range, the
range at which the ear is most sensitive, and
automatically retums it to its original level at
playback. This reduces tape hiss by the amount
of drop in the playback level, and improves the
S/N ratio at the highrange
(above
SkHz)by 10d8.
A monolithic IC (CR860) is used as the Dolby
processor. Dolby processor circuit is shown in
Fig.
14.
At record, the compressor
input is taken from
the input side of the summing amplifier C and
the prescribed characteristic is obtained by adding
the output of the compressor
to the main signal
at the summing amplifier C.
At playback,the compressor
input istaken from
the output side of the summing amplifier C.
When the input taken from the output side has
been added to the summing amplifier C as the
output of the compressor,
it is added in the op-
posite phase of the main signal and is, in effect,
subtracted.
Compressor
The input signal is sent to amplifier D thru
attenuator H via high-pass filter G. The output
of amplifier D is sent to clipper J and then to
summing amplifier C as compressor output.
On the other hand, it is also sent to amplifier E.
The output of amplifier E is sent to rectifier I
and fed back to attenuator H a-s
a control signal.
When the signal passingthru high-passfrlter G
is low level,the rectifier I voltagebecomes
almost
"0", the attenuation of attenuator H becomes
minimum and the output of the compressor
in-
creases.
When the sigpal passingthru high-passfilter G
is high level, the rectifier I voltagebecomes
high,
the attenuation of attenuatorH becomes
maximum
and the output of the compressor decreases.
-B
STD
S4 55 NOHOLE
Sq
: EO switch
Ss: CrOz tape sense
switch
Fig.
13 Recording
amP
circuit
6.2 DOLBY
PROCESSOR
This set usesa Dolby B type noisereduction
circuit. A DolbyBtypecircuit boosts
therecording
level when the input signaldropsbelow a pre-
HOLE
AmpA MPX
Filter ÂmpB
Fig.
14 Dolby
processor
circuit
Hloh-
eoss
5ii1grç AttenuoiorHAnp
D ClipporJ

6.3 OSCILLATOR
CIRCUIT
The oscillatorcircuit is shown on Fig. 15. This
circuit is a push-pull circuit (Qao:,Qsoa),
and
supplies recording bias current to the recording
head and erasing current to the erasing head
(frequency is approximately 85kHz).
Since a push-pull oscillator produces few even
harmonics, there is no DC magnetization of the
tape (even harmonics produce a plus and minus
asymmetrical waveform) and little noise.
1.When the REC button is pushed,
the REC/PB
switch Szis switched
to the REC
side,and
+Bis
suppliedto the oscillator.But sincethe MUTING
switchSzis at the ON side,
Qaos
is tumed OFF
by -B, and the circuit doesnot oscillate (only
the amp section is used).
2.When the REC and PLAY buttons are pushed
simultaneously,
Sz
is switched
to the OFF side,
Qaos
is turned ON, and the circuit begins to
oscillate.
P.B
Sz; REC/PB
swjtch
S7: MUTING switch
Fig.
15 Oscillatorcircuit
Recordrng
amp
6.4 MUTING
CIRCUIT
Muting when the power switch isturned ON and
OFF in the PLAY state
(Fig.
16)
This circuit suppresses
the click noise
produced
when the power switch is switched.
Powerswitch ON
1. Since +Bz flows through the route Coor
- Roo.t -
Qoor only while Cooris charging, Qoor
is tumed
oN.
.2.
Consequently,
Qooz
is tumed ON, Qoo.r (Qoo+)
is
turned ON, and muting is actuated.Themuting
time is determinedby the time constantof Coor
andRoor,
andisset
at approximately4.5
seconds.
PowerswitchOFF
1. Since +B is supplied to the base of Qooz
when
the power switch is set to the ON position,
Qoozis tumed OFF.
2. On the other hand, Cooz
is charged by +Bz
through the route Dooo
- Rors- Rooz.
3. When the power switch is set to the OFF
position, +Bz is no longer applied to the base
of
Qooz.
4. Furthermore, the base voltage of Qoo:is quickly
raised to zero potential through the route Door-
Roro
- Roos
- Sz
- ground. (This route is Doos
-
Rorr - Rooo
- Sz
ground at recording.)
5. At this time, the emitter potential of eooz is
maintained by the charge across Cooz,
and eoo: is
tumed ON.
6. When Qooz
is turned ON, Qoo-r
(eoor) is tumed
ON, muting is actuated, and the click noise
when the powerswitch istumed off is prevented.
S: REC/PB sw tch
S" l\.4UTlNG
swrrch
5rr HÈL Swtlch
(
I
{
Rzrr jFF 0N
lrr're
our
Ç
Flâr
amp
LINÈOtII
OFF
"7- +e
Fig.
16 Muting
circuit

Mutingat FF,REW,and
STOP
(Fig.
16)
This circuit prevents unwanted noise (for in-
stance,motor noise) at FF, REW and STOP.
1. When the set is in the STOP state, or the FF
or REW button is pushed,
MUTING switch Sz
is
set to the ON side.
2. +Bt is suppliedto Qoo+
(Qoor)
through the route
Sr
> RECswitch
Srr, Rzaz' Door
> Rot+
(Rott)
> Doos
(Deoz)
+ Qooa
(Qeo:),
and Qooa
(Qoor)
is
tumed ON.
3.\ilhen Qooo(Qoo:) is tumed ON, the signal
current of both the L and R channels
flows to
ground and is muted.
Recording
muting
(Fig.
16)
REC switch Srr is ganged
ïvith the REC button.
Mechanical
muting isprovidedsothat Sr
r is opened
after the REC/PB switch Sz has been switched
when the RECbutton ispushed,
andSz
isswitched
to the PB side after Srr has been closed when
returning to the STOPstateafter the REC button
is pushed.Noise produced when the REC button
has been pushed, and noise produced at REC *
STOP and REC/PLAY > STOP are muted by the
timing of these actions and the muting circuit
consistingof Qoor
to Qoo+
and Qroz.
In the STOP state, the MUTING switch Sz is at
the ON side, and since +Br is applied through the
route Sr t Srr t Rzoa
t Duor > Rrrs t Q:oz,
the
recording amp signal is muted.
When the PLAY button is pushed, +Bz is
suppliedthrough the route Sz
' Rrts' Qroz,
Qroz
is
tumed ON, and the muting amp signal is muted,
the same as at the STOP state. When the REC
button is pushed,Sz
is switched to the REC side,
Qroz is turned OFF, and the signal enters the
recording amp. Noise produced by switching is
preventeâ by turning Qroz ON and OFF in this
manner.
Muting
at
follow-on
recording
(Fig.
16)
This is the muting circuit when follow-on
recordingby pushingthe REC button from PLAY
operation.
t. Wtren the REC/PB switch Sz is switched from
the playback side to the recording side, +Bzis
tnppti"d through the route Rotz' Doos
> Coos
>
Roost
Szt ground.
2. The base
potential of Qooz
isdroppedand Qooz
is
tumed ON dudng the charging
time of Coos'
3.When Qeoz
is turned ON, Qooa
and Qooc
arealso
tumed ON, and muting is actuated' The muting
time is determined by the time constant of
Coos
and Roos,
and is set at approximately 0'5
second.
cT-F7clcl
4. When Szhas been switched from the playback
side to the recording side, +Bz is supplied
throughtheroute Rotz
t Doo+'Coo+'
Rooz
t Sz
t
ground.
5. Qooz
is turned ON during the chargingtime of
C
oo+.
6. When Qooz
is turned ON, muting is actuatedas
described
in item 3 above.
However,the muting
time is determinedby the time constantof Coo+
and Rooz.
6.5 CONTROL
CIRCUITS
AUTO STOP
circuit
(FaS.17l
Thiscircuit automaticallyreleases
the mechanism
by means
of asolenoidwhenrunning of the tapeis
detected and the tape has been stopped with the
mechanism
in the FF, REW or PLAY (REC)state.
Running of the tape is detected by coupling
a Hall element detector switch to the take-up
reel turntable with a belt. Since Czor
is charging
during normal operation, Qroz is turned OFF,
and is unrelated to the AUTO STOP operation.
When
tape
is
running
When the PLAY (FF, REW) button is pushed,
the MOTOR switch Sa
is switched to the ON side'
and the MUTING switch Sz
is set to the OFF side
(to the ON sideat FF and REW). Moreover,since
the PAUSE button Ssis not pushed,it is at the
OFF side.
1. While the tape is running the basepotential of
Qzor is changed as illustrated in Fig. 1? @,
by switching of the HalI element-
2. This changeis taken from C'to+,
rectified by Dzoa
and is used to tum Qzor
ON and OFF.
3. Croo
is chargedthrough the route +Bz + Rzt+
>
Ctoo
, ground, but sinceQro: is tumed ON and
OFF. the'anode voltage of Dzoa
is varied as
illustrated in Fig. 17 @.
4. +Bz is divided by Rrzr and Rzzo
and applied to
the base
of Qzo+
through Dzto' Rzrr.It is also
applied to the emitter of Qroethrough Rzrr'
Therefore,Droa
is reverse
biased
andturned off,
and Qro+
is turned OFF.
5. When Qzoa
is turned OFF, there is no voltage
drop acrossRzto, and Qzos
is zero biasedand
turned OFF.
6. Consequently, since Qroz is zero biased, it is
tumed OFF and current does not flow to the
solenoid.

AUTO START circuit
(Fig.
17)
This circuit inhibits the start of the PLAY and
REC operations until the power supply voltage
rises to'a stable value after the power switch has
been set to the ON Position
1. When
the power switch isset
to the ON position'
the chargingcurrent of Czor
flows through the
route +Èz t Cro, t Rzoz
> Qzoz
t ground' and
Q'toz
is turned ON.
2. iFi, isapplied
to the anode
of Dtoo
through R'rro'
Uut ,i.r"Ë Qrot is ON, its rise is very small and
Qroris turned OFF.
3. Therefore, Czoo
is charged through the route
- iS, ' RTre + C'too
+ gfround, and the anode
voltage of Dzoe
rises'
4. Wherithe anodevoltageof Dzoe
rises'
Qzo+'
Quos
and Qzoz are tumed ON through the same
MEMORY REWIND
operation
(F'g'17)
cr-t7oc,
2. This causes
the voltage drop across
Rrrs to be
applied to the baseof Qzoc
through Rzr:' and
solenoid.
6.6 METER
CIRCUIT
The meter circuit isshownin Fig' 18' The meter
is operated as a peak meter with a flat frequency
,".pàn." at playback, and asa peak meter having
a frequency responsewhich increases
at the low
ON Position.
Fig.
18 Meter
circuit