Pioneer PL-L70 User manual

Y PIONEER
Service
ALEVTEY
CIRCUIT DESCRIPTIONS
REPAIR & ADJUSTMENTS
ORDER NO.
ARP-684-0
STEREO TURNTABLE
PL-L7O
MODEL PL-L70 COMES IN SIX VERSIONS DISTINGUISHED AS FOLLOWS:
Voltage Remarks
AC120V only U.S.A. model
AC120V only Canada model
AC220V, 240V (Switchable) European continent model
AC220V, 240V (switchable) United Kingdom model
AC110V, 120V, 220V, 240V, (switchable) General export model
AC110V, 120V, 220V, 240V (switchable) U.S. Military model
®@ This service manual is applicable to the KU, KC, HEM, HB, S and S/G types.
e@ As to the KC, HEM, HB, S and S/G types, please refer to pages 72 and 73.
@ Ce manual d’ instruction se refére au mode de réglage, en francais.
@ Este manual de servicio trata del método de ajuste escrito en espaiiol.
CONTENTS
1. SAFETY INFORMATION ...............04. 2 11. P.C. BOARDS CONNECTION DIAGRAM ..... 41
2. SPECIFICATIONS ........ 0.000 eee ee eee 3 12. SCHEMATIC DIAGRAM............000565 45
3. FRONT PANEL FACILITIES............... 4 13. ELECTRICAL PARTS LIST. ...........0.. 47
4. BLOCK DIAGRAM ..............-020008 | 5 14, ADJUSTMENT ..... 0.0... eee eee 49
5. CIRCUIT DESCRIPTIONS................. 7 REGLAGE =. (iy iat etd temluytdaweers 53
6. ICINFORMATION .............2.0006- 31 AIJUSTEltatoe cho Custer Gace deste wk 57
7. DISASSEMBLY ......... 20. e eee ee eees 32 15. TROUBLESHOOTING 2463 cb aes odes 61
8. PARTS LOCATIONS .............00000- 35 16. SUPPLEMENT FOR KC, HEM, HB, S
9. EXPLODED VIEW AND PARTS LIST........ 37 ANDS/G TYPES ......... 0000 ce eeeeeee 72
10. PACKING...... Bob Sb OE Ra a ae RL Ee 40
PIONEER ELECTRONIC CORPORATION 1, Meguro 1-Chome, Meguro-ku, Tokyo 153, Japan
PIONEER ELECTRONICS (USA) INC. P.O. Box 1760, Long Beach, California SO0801 U.S.A.
TEL: (B00) 421-1404, [phone]
PIONEER ELECTRONIC [EUROPE] N.V. Keetberglaan 1, 2740 Beveren, Belgium TEL: [phone]:08
PIONEER ELECTRONICS AUSTRALIA PTY. LTD. 178-184 Boundary Road, Braeside, Victoria 3195, Australia
TEL: (O03) =!
a aaa FZ © NOV. 1984 Printed _in Japan _,

od ed
1. SAFETY INFORMATION
1. SAFETY PRECAUTIONS
The following check should be performed for the
continued protection of the customer and service tech-
nician.
LEAKAGE CURRENT CHECK
Measure leakage current to a known earth ground
(water pipe, conduit, etc.) by connecting a leakage current
tester such as Simpson Model 229-2 or equivalent between
the earth ground and all exposed metal parts of the appli-
ance (input/output terminals, screwheads, metal overlays,
control shaft, etc.}. Plug the AC line cord of the appliance
directly into a 120V AC 60Hz outlet and turn the AC
power switch on. Any current measured must not exceed
0.5mA.
<_]
Leakage
current
tester
Reading should
not be above
0.5mA
Device
under
test
Test all
exposed metal
surfaces
2-wire cord
Also test with
) plug reversed Earth
(Using AC adapter "ground
plug as required)
AC Leakage Test
ANY MEASUREMENTS NOT WITHIN THE LIMITS
OUTLINED ABOVE ARE INDICATIVE OF A PO-
TENTIAL SHOCK HAZARD AND MUST BE COR-
RECTED BEFORE RETURNING THE APPLIANCE
TO THE CUSTOMER.:
2. PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in the appliance
have special safety related characteristics. These are often
not evident from visual inspection nor the protection
afforded by them necessarily can be obtained by using
replacement components rated for voltage, wattage, etc.
Replacement parts which have these special safety charac-
teristics are identified in this Service Manual.
Electrical components having such features are identified
by marking with a A\ on the schematics and on the parts
list in this Service Manual.
The use of a substitute replacement component which
dose not have the same safety characteristics as the
PIONEER recommended replacement one, shown in the
parts list in this Service Manual, may create shock, fire,
or other hazards.
Product Safety is continuously under review and new
instructions are issued from time to time. For the latest
information, always consult the current PIONEER Service
Manual. A subscription to, or additional copies of, PIONEER
Service Manual may be obtained at a nominal charge from
PIONEER.

2. SPECIFICATIONS
Motor and Turntable
Drive SYSt@M ........ccecceeneeeeecesenaveseeaesaeeaeaneees Direct-drive
Mtr: dsisede diets cotta side baceeneswnes oe Csleeee Quartz PLL Hall motor
Turntable Platter ..... 304 mm diam. aluminum alloy die-cast
Speeds: -efecsscucatsist hive ting, weed wets coeeaes 33-1/3 and 45 rpm
Wow and Flutter ................00e Less than *0.012% (WRMS)
0.025% (WRMS)
+ 0.035% WTD Peak (DIN)
Values marked with an ‘“*” designate the wow and flutter for
the motor, and do not include the cartridge or tonearm load.
Signal-to-Noise-Ratio ............5..08 More than 80 dB (DIN-B)
(with Pioneer cartridge model PC-301)
Motor characteristics
Startup ..... 0... eee eee Less than 1/3 revolution
Speed variation ..........00 eee Less than 0.002%
Dirifte cacbsdicee stand anaes eons So Time: 0.0003%/h
Temp: 0.003%/°C
Tonearm
TYD0issisccd and siviasetsdeve wehea otek Integrated straight tonearm
TYPO ccccsesccvateva ves tuvedavdetsavesdvescviavteuvenerssdesarersss IM type
Stylus: s.ssvseceadideentvevesetenede 0.3 x 0.7 mil diamond (PN-301)
Output Voltage. .ves sccscws de iacisiveavevenaveorecctieesst eves 2.5 mV
(1 kHz, 5 cm/s LAT. Peak)
Tracking Force ...........cceseeeeeees 1g to 1.5 g (proper 1.25 g)
Frequency RESponse ..........csceeceescetseseeeenen 10 to 33,000 Hz
Recommended Load ...........:.:eceeeeceeuceeeeeneeeeneeeacuees 50 ka
WEIGAE iiccvoctaeefesntxnsttucemilecsve cient testuetateaessMeneaered ye 4g
Subfunctions
Auto lead-in, auto return, auto cut, repeat,
arm elevation, program search play, manual play,
skip, auto disc size selector, record detection,
auto speed selector
INFORMATION TO USER [FOR U.S.A. MODEL]
This equipment generates and uses radio frequency
energy and if not installed and used properly, that is, in
strict accordance with the manufacture’s instructions,
may cause interference to radio and television recep-
tion. It has been type tested and found to comply with following measures:
the limits for a Class B computing device in accordance * reorient the receiving antenna
if this equipment does cause interference to radio or
television reception, which can be determined by turn-
ing the equipment off and on, the user is encouraged to
try to correct the interference by one or more of the
Miscellaneous
Power Requirements
HEM, HB, HP models ...............0.00008 AC 220 V/240 V~
(switchable), 50, 60 Hz
KU, KC models ...........cecececeeeseeeeeeeeeees AC 120 V, 60 Hz
S, S/G models ............ AC 110V/120 V/220 V/240 V~
(switchable), 50, 60 Hz
Power Consumption
HEM, HB, HP models .............cccsceeeeeeeeeeeereeeeeeers 15W
KU, KC models aise cdscccssctucciviverecscvbesecsevedocesseads 14W
S\S/GMOElS! i vis sissosceencss dbcexcncutensvedtesnecdec tack’ 10W
Dimensions .............cceeeeeees 420 (W) x 108 (H) x 365 (D) mm
16-1/2 (W) x 4-1/4 (H) x 14-3/8 (D) in.
Weight us scasseccaseed sacsdouvevecantuesebceveunss surom eevee s 5kg/11 Ib
Accessories
EP Adapter ......cccceccseesecseceeseeeneececeeseeeaeeneeeeeetnesereees 1
Operating Instructions ............cccseeeseeeeeeeaeeeeeseeaneeneesenes 1
NOTE:
Specifications and design subject to possible modification without
notice, due to improvements.
lf necessary, the user should consult the dealer or an ex-
perienced radio/television technician for additional sug-
gestions. The user may find the following bookiet
prepared by the Federal Communications Comission
helpful:
“How to Identify and Resolve Radio-TV Interference
with the specifications in Subpart J of Part 15 of FCC ¢ relocate this component with respect to the Problems”.
Rules, which are designed to provide reasonable protec- receiver
tion against such interference in a residential installa- *® move this component away from the receiver
tion. However, there is no guarantee that interference ¢ plug this component into a different outlet so that
component and receiver are on different branch cir-
will not occur in a particular installation.
cuits.
This booklet is available from the US Government Prin-
ting Office, Washington, D.C., 20402, Stock No.
004-000-00345-4.
The above instructions apply only to units which will
be operated in the United States.
3. FRONT PANEL FACITIES
Hip
o_o
3 6
@ POWER switch
Press this switch to turn the power on and off.
[ON] (depressed position) : Power is switched ON.
[STAND-BY] (released position): Power is switched OFF.
@ PROGRAM switches/indicator
e Press these switches in the desired sequence from [1]
through [8] when programming the order in which the
tracks are to be played. The tracks are programmed in the
order in which the switches were pressed, and auto play
or repeat play is performed.
e The numbers [1] through [8] indicate the order of the
tracks on the record (for instance, the [2] switch cor-
responds with the second track). During programmed
playback, the program indicator corresponding to the
track presently being played will flash.
@ CLEAR switch
This switch is pressed in order to clear the program.
@ REPEAT switch/indicator
Press this switch so that the indicator lights for repeat play.
@© LOCATE/SKIP switches (SKIP)
Use these switches to start manual playback, or during
playback to change the track being played. When the
switches are pressed, the tonearm will move to the right or
left.
[<4]: Tonearm moves to left. During programmed play,
moves to the next programmed track. If pressed multiple
times, moves ahead the number of tracks corresponding to
the number of times the switch is pressed.
[> ]: Tonearm moves to right. During programmed play,
moves back to the beginning of the track presently being
played. If pressed multiple times, moves back the number of
tracks corresponding to the number of times the switch is
pressed.
PL-L7O
NOTE:
When
this
switch
is
used
during
programmed
play,
do
not
allow
more
than
a
1-second
interval
between
presses.
© ARM ELEVATION switch(UP)/
indicator
e Use the switch for manual play.
e
Use
the
switch
to
suspend
record
play
temporarily.
e
Use
the
switch
when
changing
the
tracks
during
manual
play.
{UP] indicator lights:
The
tonearm
rises
(the
stylus
moves
away
from
the
record).
[UP] indicator goes out:
The
tonearm
descends
(the
stylus
is
lowered
onto
the
record).
@ START/STOP switch
Depress
this
switch
when
starting
auto
play
or
when
stop-
ping play.
SPEED switch
Set
this
switch
in
accordance
with
the
speed
of
the
record
which is to be played.
[AUTO]:
Automatically
sets
rotation
speed
in
accordance
with
the
size
of
the
record:
Rotates
at
33-1/3
rpm
with
30
cm
and
25
cm
records.
Rotates
at
45
rpm
with
17
cm
records.
[33]: Rotates at 33-1/3 rpm
[45]: Rotates at 45 rpm
@ SENSOR switch
Depending on the type of record being played, this switch
may
be
used
to
adjust
the
sensitivity
at
the
time
of
program.
med play.
Normally the switch should be left in [N] position.
[N]: For normal records.
[H]:
For
records
with
very
narrow
intervals
between
tracks,
[L]:
For
records
with
wide
sound-groove
pitch.
d) Platter
qd) Rubber mat
@) Platter shaft
a) Tonearm
Cartridge (PC-301)
(@ EP adapter
This is used when playing records with a “large center hole”.
Cabinet
@ Dust cover

od ed 2)
4. BLOCK DIAGRAM
PU muting circuit Reset circuit
Auto function | circuit
: Drive amplifier
: Hall amplifier + >
position signal composite circuit CO»
: V-l conversion . qio2
: Drive amplifier Auto function
: Reset circuit | j o
: Sample and hold circuit © K)
: Voltage regulator circuit Qlo
: Buffer amplifier
: FG amplifier
: Timing circuit
: Phase comparison
: Lock indicator circuit fe Pull up resistor
: 1/2 VCC, circuit
Z\ 0102
SrFAcCTITOAMMOQ wp
Phono motor
Q3 Lj
X tal
ae eh a | Y)
Frequency
1/4096 divider (oY
5 | er 33 rom 1/27
45 rpm 1/20
ie a i
een masa aS
been ed
Key matrix circuit
f, LY
ee ea
at CY) ee Tonearm
+81 (12V) +B2(5V) XY dive Gibtde
Power supply assembly '
(4) Forward/| (11) LH a
reverse
> Lo ©
{J
7 a wane X
60Hz
(7)
>
O
(10)
Tracking
sensor
Band sensor circuit
PD6032
VRi1, 2: Band
sensor gain
ADJ
sv] Differential
amplifier ty"
Qs uA
7 8
a <i $ Band sensor LED:
Band signal NJL1102EH
amplifier Ph Phir: PCX-059
Brisa
Zero cross
comparator
» i
Band py Se:
CLS S
7 pt of Record Outside edge
30cm size record<= surface => of record
sensitivity |
Gompalarer VR3: band sensor offset ADJ
sig
O Turns on
when arm
ON is On rest
switch (S16)
Tonearm down sensor
Ev 1 (drawing
rod in)
Ev 2 (holding
rod in)
Tonearm address signal generator circuit Mechanism base Guide bar
ARM
<4
board
assembly
ARM > ADDRESS (36)
Photo interrupter
for tonearm address
signal generator
(Q301)
r
'
{
i]
1
’
'
i
t
r '
( ' L
Slit whéel
Mechanism base
Slit wheel
pT
ae:
4
gain
adjustment
Tonearm
assembly
Tonearm position sensor
switch (S19)
Cover O/C sensor
switch ($18)
Sensor sensitivity selector
g Carriage base
board assembly
Tracking
sensor
(Q201)

5. CIRCUIT DESCRIPTIONS
5.1 CIRCUIT DESCRIPTIONS
5.1.1 Address Sensor Circuit
The address sensor is located on the mechanism base
unit. It detects the position of the tonearm and sends ad-
dress pulses to the control IC as the tonearm moves. The
address sensor is made up of an internal Schmitt trigger
circuit photo interrupter and a slit wheel which is syn-
chronized with the carriage. The slit wheel spins when the
carriage moves and intermittently cuts off light to the
photo interrupter (Q301) in pulses which correspond to
the carriage movement. These pulses are counted by the
contro! IC, which detects the distance the carriage moves,
the tonearm lowering position and the end of the record.
It also registers band addresses,
The address pulses from the photo interrupter work
as follows: When the light is cut off, the output is “’L,’”’
and when the light is not cut off the output is ‘‘H.”” One
address signal pulse is approximately equivalent to 0.114 mm
of tonearm movement.
Voltage regulator
Stit wheel
Fig. 5-1 Address Sensor Circuit
5.1.2 Tracking Sensor Circuit
This circuit detects tracking errors by means of a shutter
which is synchronized with the tonearm and a photo in-
terrupter.
The tracking sensor is made up of a shutter synchro-
nized with the tonearm and a photo interrupter which is
mounted onto the carriage base board. When the tonearm
lowers and begins tracing the record surface the tonearm
tracking errors increase as the number of rpms increases.
When tracking errors increase, the shutter, which is syn-
chronized with the tonearm, also moves and the light cut-
off rate of the photo interrupter changes. Subsequently, the
output of the photo interrupter changes and is sent to the
tonearm drive unit in the form of tracking error signals.
al Q3 M54547P
From P12
+12V (
Tracking sensor
gain ADJ
Tonearm
drive motor
Fig. 5-2 Tracking sensor circuit
Sensor
Shutter
Shutter
Sensor
Tracking error
3v f----2
1.1¥ ——=--— Tracking center
Tracking error
Small Large
Fig. 5-3 Detection of tracking errors.

L-L7O
5.1.3 Band Sensor Circuit (Record center) (Record outside edge
The
band
sensor
circuit
detects
the
size
of
the
record
ee
ee
and
width
of
bands
by
means of
a
band
sensor, It is
made
up of a
30cm
size comparator,
a band
comparator,
a
zero
cross
comparator,
a
differential
amplifier
circuit,
an
am-
plifier,
and
a
band
sensor.
The band sensor itself is made up of 2 phototransistors
(PCX-059) mounted into the headshell of the tonearm and
an infrared LED (NJL1102EH). It uses a light sensor and B
the different rates of light reflection to determine the dif-
ference between a sound groove and a plain band. The out-
put of the band sensor is amplified by each of the am-
plifiers and applied to the differential amplifier to obtain a
waveform like that of C in figure 5-5. The zero cross
comparator detects a band signal (zero cross point), from
the differential amplifier and the band comparator detects
signals whose potential is less than O6 (3/3) pin 8 as a band
signal.
These signals then enter the control IC (PD6032) in the
waveforms shown in D and E in figure 5-5. In this way, the D
center of the band that the tonearm is tracing can be detec-
ted.
The
30cm
size
comparator
receives
the
amplified
output
E
ae
oes
ah”
<<
Li
ORS
signal of
the band
sensor.
If
it detects no
record
in
the
30cm area, then
a
waveform
as
shown
in
F
in
figure
5-5
Waveform
will be output to the control IC. at C when
there is no record
(Turntable center) (Turntabie outside edge)
SV
Turntable at 30cm
lowering position
Waveform at F li
when there is no
record ora
17cm record
‘
My
1
ve
it
tt
Ha
1
Fig. 5-5 Band sensor waveform
Ql 5V
Qé
z-cross (5) <é| ‘
RI
Zero cross
comparator
Band sensor LED:
NJL1102EH
Ph Tr: PCX-059
<= Record =>
Record §gurface Record
center outside edge
30cm size
comparator
Fig. 5-4 Band Sensor Circuit

5.1.4 Elevation and Tonearm Circuits
The tonearm drive motor and EV solenoid are controlled
by commands from the control IC (Q1), which also con-
trols the horizontal and vertical movement of the tonearm.
In addition to this, the IC controls tonearm tracking with
the tracking sensor and tracking error signals.
@ EV solenoid drive
The EV solenoid drive uses a large current at first to
draw the plunger inside, and thereafter uses a lower current
for holding the plunger in.
The signal to draw the plunger inside comes from the
control IC (Q1), passes through the Q2 transistor array, and
enters Q3 pin 7. This signal turns on the Q3 Darlington
transistor, and approximately 170mA of current runs into
the collector, turning on the EV solenoid which draws the
plunger inside. Because of this, the tonearm will drop
slightly. This ‘draw’ signal from the control IC lasts about
1 second. Next, the hold signal, which was output at the
same time as the draw signal, passes through the Q2 tran-
sistor array, enters Q3 pin 8 and turns on the Darlington
transistor. When the draw signal ends, a current of ap-
proximately 7OmA drawn from pin 9 holds the plunger
inside, which keeps the tonearm elevation down until the
hold signal ends.
Tracking error
at
:
STOP ‘Tracking
@ ©
©
Q3: M54547P
Pee fe [oo] tat oe
Tels]
Pe be De Lo ree |
@ Tonearm drive
The tonearm drive is controlled by input to Q3 pin 4,
pin 5, and pin 15. Their truth values are shown in Fig. 5-6.
®@ Lead-in (locate-in)
Q3 receives locate-in signals from the control IC (Q1),
and with an output of approximately OV from Q3 pin 14
(01) and approximately 11V from pin 11 (02), the tone-
arm motor begins turning in the lead-in direction.
@ Lead-out (locate-out)
Q3 receives locate-out signals from the contro! IC (Q1),
and with an output of approximately 11V from pin 14 and
approximately OV from pin 11, the tonearm motor begins
turning in the lead-out direction.
@ Stop
Q3 receives stop signals from the control IC (Q1), and
with an output of approximately OV from both pin 14 and
pin 11, stops the tonearm motor.
@ Tracking
Q3 receives tracking signals from the control IC (Q1),
and between pin 14 and pin 11, outputs an amplified
tracking error signal (amplified by an internal OP am-
plifier) and begins turning the tonearm drive motor in
such a way as to correct the error.
—$— : Pull up resistor
EV SW ON
v
Tonearm
operation
ae! Sec
oU
@msire
!Tonearm! Tonears
‘down } up
Fig. 5-6 Elevation and Tonearm Drive Circuit and 1/O Truth Value Chart.

L-L7O
5.1.5 Key Matrix Circuit
The key matrix circuit reads the digit output (pins
22 to 25) of the control IC (Q1) from the Key IN terminal
(pins 26 to 29) and distinguishes different key input sig-
nals with the control IC. In addition to carrying out key in-
put operations, it lights LEDs with output from pins 17 to
19. Fig. 5-8 shows the output waves produced by switch
matrix input in the following order: REP SW, Program SW
7, and EV SW.
Ql
r Qs)
KEY ee)
IN
E @7)
Ge)
1.2mS ie
$13 (m)] si4(s/s)
f =k 2.8ms DIS yt al
@5) -
' $9 (CLR) J SIO(REP)} StI (4) | si2(Ev)
cor Xt ys xo yo}
(7)
Ga}
-—
Lee
' 85 (5) J S6(6) £S7(7) »S8(8)
|
DIGIT
ran
tl
poe
yo
‘yo
ys}
Yo
i O17
(8)
Leo
@}-—_
f
SE
0a
a
LR
NE
' Si (1) $2(2)) $3(3) S4 (4)
1 S Ye Ye
LI LJ Di6 xX x x
(5)
i
|
ag
Pf
+6
‘@ Qa
Ye L®
o's
aia ra
{K)
Ad 2°" py O13
| aoe 4QBi0)
db ae dos
Fig. 5-7 Key Matrix Circuit
i Program
Control
SWs
all
OFF
[REP]
sw
ow
sw
ON
Ev]
sw
on
SW matrix
2—~<—
2 ++ —(7}- 3 rm
27 REP
2 6 SAI
U2
mSEC
26
ces
a
2.6 m$EC
23} | 1 4)
24 —»—+—_| 4
23 »—_+_+
2
REP |uP
~~ S-®e X
is sie “par |ehie
'v t 2 3 4
Display
LEDs
all
OFF
[REP]
+e0
on
[REP],
@]}ue0
on
(FeP],
(7)
[UP]Leo
on
LED
matrix
REP vv —__- ner @Y ——_- REP @~ _-___
1@v———- + @
wv Ov —_—__—+
Fig. 5-8 Output Waveforms Produced by Key Input
10

5.1.6 Fader Circuit
The
fader
circuit
controls
audio
performance
using
con-
trol signals from the fader deck.
@ Cross fade recording operation
By
pushing
the
synchronizer
switch
and
the
auto
fader
switch
of
the
fader
deck,
the
fader
standby
input
will
turn
ON
{L),
allowing
for
synchronization
of
the
fader.
When
the
program
switch
is
used
to
choose
the
playing
order,
the
unit
goes
into
search
mode,
and
after
searching,
the
tonearm
leads
out
to
the
first
selection
and
goes
into
UP
standby.
If
the
fader
deck
source
IN
button
is
pushed
at
this
time,
the
deck
will
send
the
player
a
fade
1/O
signal
(trailing
¥_)
and
the
cross
fade
operation
will
begin.
The
player
receives
the
signal
(trailing
¥_
)
and
lowers
the
tonearm
onto
the
record.
In
the
same
way,
when
the
tonearm
is
tracing
and
the
fader
deck
tape
IN
(or
the
fade
OUT)
button
is
pushed,
the
fader
performs
the
cross
fade
(or
fade
OUT)
operation.
When
it
finishes
it
sends
the
player
a
leading
signal
4.
The
player
receives
this
signal
and
begins
the
+skip
opera-
tion,
and
heads
for
the
next
selection.
When
the
fader
standby
input
is
ON
(L)
the
deck
doesn’t
receive
deck
synchronizer
output.
@ Synchronized REC operation
Synchronized
REC
is
an
operation
which
uses
the
deck
synchronizer
output
to
turn
the
deck
to
REC
and
REC/
PAUSE
mode
as
soon
as
the
stylus
leaves
the
record
sur-
face.
During
this
operation,
the
fader
I/O
input
and
the
fader
standby
input
are
both
OFF
(L).
Fader I/O
me
Fader FADER SW Fader standby
deck Deck synchronizer
TC-CONT
=e
Fig. 5-10 Fader Circuit
Cross fade recording operation
(Deck
B
REC)
Col
len
os
ee
CA
(ese
Sst
SES
No movement because
the fader standby
input is OFF
Arrives
at next
selection
UP STANDBY
Search
begins
Ba]
Lead-out
D>
Program
input
Tonearm
down
at specified
selection
UP STANDBY
POWER
Player
operation
\\Down
Playing selection
Fader 1/O
input
L = GND level
Fader Hoty
standby
input |
Deck H = High| impedance
synchronizer
L
=
Low
impedance
output
Auto
fader!
|
Peve.,
acre
Sourch
IN}
|
Tape
IN
switch
ON
itch
ON
i
Sich
OFF
switch
ON
switch
ON
Fader deck
operation
Synchronized REC operation
Player
operation
ri
Search
=
Arrives
Arrives
Prog
em
begins
Lead-out
at
specified
at
next
Tonearm
POWER
input
selection
selection;
up.
ON
<A
bb
tonearm
down
tonearm
down
7
>
:
of
powN
Playing
,
eh
*\
DOWN
Playing
J
uP
re
selection
selection
H
50.
aT
Fade
1/0
oN
!
input
|
;
'
\
'
:
=
1
|
Fader
H
=0.7V
|
\
!
'
standby
:
'
\
'
input
!
'
1 '
H = High impedance
Deck
L
=
Low
synchronizer
impedance
output
Auto fader
switch OFF
Fader deck
opeation :
‘
11
ad el |
12

ad oe Ae
5.1.7 Phono Motor Circuit
The phono motor of this player uses magnetism along
the outside edge of the drive magnet to determine its rpm
value. (Formerly, a separate magnet was needed in addition
to the drive magnet.)
This motor uses a PA2017 as its control drive IC and a
crystal oscillator circuit in the oscillator circuit unit. Also,
since this motor is brushless and coreless, the position of
the rotor magnet is detected by two Hall elements HA and
HB, which make the motor turn by switching the current
to the drive coil electronically. When voltage is applied to
the whole elements HA and HB, a voltage differential is
created in the output interval by the magnetic field of the
approaching rotor. The Hall elements HA and HB are also
attached 90° electrically out of phase so their output sig-
nals have a 90° phase difference. (See Fig. 5-13)
After the output voltage from the Hall elements have
been amplified by the PA2017 Hall amplifier, it enters a
position signal composite circuit (See Fig. 5-15). The
output from the position signal composite circuit is then
input into the respective drive amplifiers. The coil current
at this time is as shown is figure 5-13 coils A and B. This
current produces a magnetic field in the drive coil, and the
polarity of the coil and the polarity of the rotor attract and
repel each other causing the motor to start turning.
When the motor starts turning, the signal (approximately
0.5mV p-p) produced by a frequency generator (FG) in
the mtor rotation unit, is amplified to about 0.3V p-p by
Pin 22 HAt
Pin 21 HA—
Pin 20 HB+
Pin 19 HB—
Coil A
Pin 1 waveform
seen with pin 2
as reference
Coil B
Pin 23 waveform
seen with pin 24
as reference
Fig. 5-13 Hall Elements and Coil Terminal Waveforms
13
an FG amplifier (5, Q6) and is input into the FG ampli-
fier (input pin 17) inside PA2017. Possible frequencies at
this
point
are
55.55
Hz
for
33
rpm
and
75
Hz
for
45
rpm.
The signal then undergoes waveform shaping in the
Schmitt transistor, and is then input into the reset circuit,
the sample and hold circuit and finally the timing circuit
for a timing pulse for the phase comparison circuit. In the
PDO0008, the crystal generated 6.144MHz frequency is divi-
ded into 1.5kHz (a division of 1/4096) by the frequency
divider circuit. This signal is further divided by a dividing
ratio selection circuit to 55.55Hz for 33 rpm (a division of
1/27) and to 75 Hz for 45 rpm (a division of 1/20). These
pulses
are
output
to
PDOOO8
pin
15.
This
reference
pulse
from
PD0008
and
the
signal
from
the
timing
circuit
of
PA2017
undergo
phase
comparison
in
the
phase
compa-
rison
circuit.
Output
pulses
can
then
be
made
in
reference
to
the
phase
difference.
Because
these
pulses
speed
up
the
charging time constants of their output sections, P — V
conversion takes place. Also, F — V conversion takes
place in those sections of the sample and hold circuit and
the reset circuit when there is no output pulse from the
phase comparison circuit. As a result, voltage which has
undergone P — V and F — V conversion is output to pin 8.
This output is then amplified by the buffer amplifier and
input into the V — | conversion circuit. The V — | con-
version circuit controls the current that flows into the drive
circuit based on the difference between the output of the
buffer amplifier and the referance voltage (1/2VCC2).
Drive circuit current
Steady rotation
operation point
ie)
-<-__—_ +
Voltage between pin 10 and pin 11
Fig.
5-14
V
—
|
Conversion
+
Drive
Circuit
1/O
Characteristics
When
the
motor
has
just
begun
truning,
the
F
—
V
conversion
voltage
will
be
higher
than
the
reference
voltage,
so
current
will
fiow
into
the
drive
coil,
and
the
motor
will
speed
up.
Gradually,
the
motor
will
return
to
a
constant
rotation
speed.
When
the
motor
spins
faster
than
regulation
speed,
both
the
P
—
V
and
F
—
V
conversion
voltage
become
lower
than
the
reference
voltage.
This
causes
the
current
to
stop
flowing
in
the
drive
circuit
and
the
rpms
decrease
because
of
a
loss
of
torque.
Crystal!
Oscillator circuit
Hail amplifier +
Position signal
composite circuit
‘Sample and
hold circuit
Toall
blocks
regulator
circuit
indicator
circuit
1/2 VCC,
circuit
¢))
vec
a r Bo
| i
(8) (2) i 2
G 33/3: H (OPEN)
4h ib
G START: H (OPEN)
pk
STOP
Fig. 5-15 Phono motor circuit
(Approximately 0.3V p-p)
A
l.7V
3.7V
en Cl oh hat
2.3V
ZV
OV
0.86 msec
“i
2.1V
Pin 14 ans | |
1.4v
TAV
Pin
13
|
zs
|
J
|
e
Ov
'
'
’
t
4
i
4
1
'
t
3.6V
Pin 6
Ov
Pin8
a
56
Pin 10). 3.6V
Fig. 5-16 Phono Motor Circuit Waveforms
14

5.2 CONTROL PANEL EXPLANATION
® KEY SW (Control Switches)
The control pane! of this player is as shown in figure
5-17. It performs the following functions:
SPEED
33° AUTO 45
f————_ PROGRAM.) ——_
go! o2 CLR OOREP cup
A Ss AE OR EIS ae |
Fig. 5-17 Control! Panel
5.2.1 POWER SW (Power Switch)
This switch turns on the power and resets the player.
The tonearm will return to the rest. (The unit also resets
when the cover is opened sending the tonearm back to the
rest.)
© The UP light is on All others are off.
© The phono motor is stationary
5.2.2 SPEED SW (Speed Selector)
Sliding
the
speed
selector
to
either
33
or
45
sets
the
phono
motor
rpms
to
33
or
45
respectively.
If
the
switch
is
set
to
AUTO
and
the
cover
is
closed,
and
then
set
to
fully
automatic
or
program
selection
mode,
then
the
player
will
select
the
motor
speed
automatically
based
on
the
size
of
the
record.
Record size:
30cm 33 1/3rpm
25cm 33 1/3 rpm
17cm 45rpm
If you use the locate switch to play records manually
(without using the automatic or program selection func-
tions), the turntable will play all records at 33 1/3 rpm
while the speed selector is in the AUTO position. If the
cover is opened after the size has been set, the rpm setting
will be reset to 33 1/3 rpm. (However, if the speed selector
is set to 33 or 45, then the rpm setting will not change even
when the cover is opened.)
5.2.3. 1 — 8 SW (Program Selection Switches)
@ These are pressed for program selection.
@ Selection repeat (up to 8 times) and programming (up
to 15 steps) are possible.
@ Pressing any of the buttans 1 through 8 will cause the
tonearm to begin to search. It will move from the rest
to the end of the record. When it has finished, the LED
display will begin to blink, and the tonearm will proceed
to the first selection on the program. However, if the
tonearm has already searched after the cover is closed,
then the LED display will start blinking without an
additional search taking place. It will proceed directly
to the first selection on the program. (If the cover is
opened, however, that search data will be cleared.)
e It is possible to add more selections to the program at
any time. (Regardless of whether the tonearm is lead-
ing-in, tracing or searching.) Moreover, when the selec-
tions have finished, or when the tonearm is returned by
pressing the S/S SW, it is possible to reprogram selec-
tions even with the cover open. The tonearm will return
to the rest, and if the cover is closed, it will begin to lead
in or search.
e@ Reprogramming is not possible during fully automatic
selection playing.
5.2.4 CLR SW (Clear Switch)
@ Pressing this button clears all previously programmed
selections.
@ It can be used at any time. When a program has been
cleared, the player returns to normal, fully automatic
selection playing.
5.2.5 REP SW (Repeat Switch)
@ This switch is used to repeat (or stop repeating) a
selection.
e A selection may be repeated up to a maximum of 8
times. (During both program selection and fully auto-
matic selection playing.) The LED display will start
blinking when the eighth repeat has been programmed.
@ It can be used at any time. (It turns ON or OFF with
each press of the button.) When the unit receives a “REP
ON” command after it has finished playing a selection,
or when the tonearm is returning after pressing the S/S
switch, it will interpret this to mean that it should repeat
starting with the next selection. When the ‘“REP ON”
command is made (except when the tonearm is on the
rest) the player will first finish playing the entire side
(when on automatic) or complete the entire program
(when on program), return to the rest, and then lead in
again.
5.2.6 EV SW (Cueing Switch)
@ This switch raises and lowers: the tonearm.
@ The cueing switch will respond when the tonearm is all
the way UP or tracing (all the way down, or moving
down). When it is all the way up, it will respond to a
down command, and when it is tracing, or moving down,
it will respond to an up command. It won't respond to
commands at any other time.
5.2.7 S/S SW (Start/stop switch)
@ This switch is used to begin automatic playing and to
end automatic or programmed playing.
@ |t can be used at any time.
When the cover is open:
All programming and repeat commands will be cleared.
When the cover is closed:
If the tonearm is on the rest, automatic pfaying will
begin.
When the tonearm is not on the rest, playing will stop
and any repeat commands will be cleared. The tonearm
will then return to the rest.
15

PL-L7O
5.2.8 <4, PrPSW
This switch has two separate functions
1. Function 1... Locate.
During automatic playing (when the tonearm is on the
rest and the player is started using the S/S SW) and during
manual playing (when the tonearm is on the rest and the
player is started using the <4 SW), this switch performs a
locate function.
44SW ON .. . The tonearm will move toward the center of
the record.
>> SW ON... The tonearm will move toward the outside
edge of the record.
o
>]
>[s]
>[7
Example: G]—[2]
>{8
Now playing
With +SKIP button pressed
2. Function 2... Skip
During programmed playing {when the player is started
using the program SW), this switch performs a skip func-
tion.
<SW (+SKIP) . .. Player stops playing present selection
and goes on to the next. It will skip one selection for
each time it is pushed.
be SW (—SKIP) . . . When pressed once it will return to the
beginning of the present selection. If pressed N times, then
it will go back N — 1 selections.
When programmed to play selections 1, 2, 4, 5, 7, 8
With —SKIP button pressed
Record surface
Three
times
Twice
Once
Once Three
times
Twice
Selection 8 | Selection 7|Selection 6|Selection 5
Selection 4/Selection 3} Selection 2| Selection 1
Fig. 5-18
5.3 MODE TRANSITION
5.3.1 Initial Reset
Power ON
STOP
STATUS
Qt: PD6O32
+B: 12V generated
+B, : SV generated
Fig. 5-19
16
Phono
motor is
stationary
LED ‘UP’
goes on
The tonearm
returns to
the rest
Initial reset
complete

5.3.2 Mode Transition Chart 1
@ When using automatic playing (no standby input)
No
Is record
on turntable?
Yes
the tonearm
come down on the
record-center side
of the groove?
No
Yes
No
|
ee ae
Did
the tonearm
come down in the
proper place?
No
Yes
No
Yes
POWER ON
Initial reset
Ga
—_\——-, |
REP SW can be used at any
time
Tonearm is
on the rest
Locate switch or
S/S switch in ON
center of record
Ae ee oe moves toward
Size detection takes place
(whether there is a record or
not), and when there is a
record, the tonearm lowers
onto the record surface ap-
proximately 7mm beyond the
first selection,
Ae tonearm moves toward
ly Locate SW ON —---
Yes
4
|
|
eo ee a ee
{
1
|
oe
®
Fig. 5-20-14
the outside edge of the record.
17
od ed
Down trace mode
Playing selection
a
Y
<a
es
Yes
Locate SW ON
Yes
Locate mode
= =]
End of record?
Yes
No
Locate SW ON
No Locate SW ON
Yes
No
Yes
\
No
REP clear
Yes
Eee,
peer
nies
Sieg
ee
eee
Penn
Tonearm
Up
return
to
rest
tonearm reach
the rest?
When
the
tonearm
is
returning
and
REP
ON
is
commanded
with
the
REP
SW,
the
unit
won't
restart.
The
repeat
operation
will
end
after
a
maximum
of
8
times.
Is the
REP SW ON?
Fig. 5-20-2
18

5.3.3 Mode Transition Chart 2
POWER ON
Initial reset
@ Using programmed playing (no standby input)
REP SW can be used at any time
The tonearm is
on the rest
Locate or
S/S SW ON
---—
-{
Program
SW ON
Fully automatic
Manual
Search alread
completed?
The tonearm begins searching when the
program SWs (1 through 8) have been
pushed. The search is completed at a
level close to the surface of the record.
No
Se
Y Close to N
=
the
end
of
the
2
Record
surface
record? proximity (about 112mm)
Yes
No B)
Is there a record?
Yes
aa
The
tonearm
moves
Pr Wee et Se es Stes doea 3s auras Meee cee toward the outside edge
of the record and goes
beyond the specified
selection by about 7mm
N ips :
° Specified selection
qi
Yes ¥
s J nigh Dyoeat the No te 7mm
specified selection?
Yes
<}—_____—.
a
The
tonearm
toward
=
ae
penta
ee
i
See
Wed
AT
Get
es
the
center
of
the
record
to
the
specified
selec-
tion,
Specified selection
<fea>* a
Yes
Did the tone- N
arm arrive at the 0
sepeficied
selection?
Yes
Fig. 5-21-1
1923
|
——_—_-—--——
ace mode
4
Yes
The tonearm lowers and detects
the specified selection band cen-
ter.
Muting is ON
No Band
input |
Yes Zero
<<
cross
mM
+m
Specified
No : ree
selection finished?
No End of record?
Yes 4
Yes
REP
1
through
[s
there
8 clear
Yes
No
UP mode
No another
program?
> Finish playing
Is next “ wee .
Return
mode
selection
closer
N
specified
selection
=
to
record
edge?
N+
and
go
to
next
a
f
selection
or return
Did the _
tonearm arrive
at the rest?
When the tonearm is returning and REP ON is commanded with the
REP SW, the unit won't restart. The repeat operation will end after
a maximum of 8 times.
Fig. 5-21-2
20

5.4 OPERATION MODE EXPLANATIONS
5.4.1 Power ON
When the power is turned on or the cover is opened,
the PL-L70 performs the following operations.
1. It returns the tonearm to the rest.
2. \t turns off the program display (1 through 8) and the
REP display LEDs and turns on the UP display LED.
3. It stops the phono motor rotation.
4. It turns the muting on.
5.4.2 Rest Mode
With the PL-L70 on and awaiting input, all of the func-
tions work with the exception of the EV SW. During the
rest mode, the buttons, when pushed, perform the follow-
ing functions.
1. SWs 1 through 8
Pushing any of these will start the search mode.
When searching has already been completed the lead-in
mode will begin.
2. REP SW
This turns the repeat function ON and OFF alternately.
3. 4< SW
This turns the turntable and moves the tonearm toward
the record center. With manual playing, it works as a
locate SW.
4. S/S SW
This starts the lead-in operation during automatic play-
ing. (The turntable rotates and player switches to
lead-in mode)
5.4.3 Search mode
f=
aaa
It does the following while moving the tonearm from
the rest to the center of the record.
1.
It
determines
the
size
of
the
record.
(And
the
speed
as
well)
2. It records the band address.
3. It detects programmed selection.
When
the
speed
SW
is
set
to
AUTO,
the
speed
for
30cm
and
25cm
records
is
33rpm.
When
the
search
mode
detects
a
17cm
record,
then
it
sets
the
speed
to
45rpm.
However,
at
this
point,
the
turntable
is
not
yet
spinning.
When the tonearm gets to the 17cm size area and detects
no
record,
it
then
clears
the
program
and
repeat
(s)
{if
any)
and returns to the rest. (Switches to return mode.)
When the tonearm comes to the end of a record and it
has
a
programmed
selection
number
that
is
higher
than
the
ad oe eo
actual number of record selections, it clears those numbers
from its memory and begins the lead-out operation. (Swit-
ches to lead-out mode) For example, if the number of ac-
tual selections that a record has is 6, and more than 7
selections are programmed, then the numbers above 6 are
cleared from the memory.
In the search mode, all functions work with the excep-
tion of EV,4<4, >» SWs.
1. SWs 1 through 8
Repeat input is possible, and up to 15 steps can be
programmed into the PL-L70.
2. CLR SW
It clears everything in the memory, and the search
operation will continue.
3. REP SW
It turns the repeat ON and OFF alternately.
4. S/S SW
It clears programmed selections and/or repeats and
starts the return operation. (Switches to return mode.)
5.4.4 Lead-out Mode
@ During automatic playing
This moves the tonearm toward the outside edge of the
record until it addresses the first selection. Then depending
on whether or not there is fader standby input operates in
the following manner.
1. With fader standby
It stops moving the tonearm, and holds it UP and waits
for fader DOWN input. (Switches to UP mode)
2. Without fader standby
It stops moving the tonearm, and starts to move it
DOWN. (Switches to down trace mode.)
® During programmed selection playing
If the EV is DOWN, then it brings the tonearm UP and
moves it toward the outside edge of the record. However,
depending on whether it is pushed during the first selection
of a program or after that, the operations change.
1. When pushed during the first selection of a program.
It moves the tonearm to the address of the first selec-
tion, and thereafter operates as with automatic selection
playing.
2. When pushed during subsequent selections of a program.
It moves the tonearm back 64 address units from the
selection address (approximately 7.3mm toward the
outside edge of the record) where it changes direction
and begins the lead-in operation. (Switches to lead-in
mode.)

In
the
lead-out
mode
the
REP
and
S/S
SWs
work,
but
the
other
functions,
program
SWs
(1
through
8)
and
the
CLR
only
work
during
programmed
selection
playing.
1.
REP
SW
This
turns
the
repeat
ON
and
OFF
alternately.
2.
S/S
SW
This
clears
any
programming
and/or
repeat(s)
and
starts
the
return
operation.
(Switches
to
the
return
mode.)
3.
SWs
1
through
8
These
permit
repeating
the
same
selection
and
the
ad-
dition
of
more
programming
(up
to
15
steps)
during
programmed
selection
playing.
4.
CLR
SW
This
clears
programming.
After
that,
it
switches
to
auto-
matic
playing.
(It
starts
leading
out
to
the
first
selection.
5.4.5 Lead-in Mode
pa
piacere OO
@ During fully automatic playing
If the size of the record has not yet been determined,
the tonearm does this while moving to the address of
the first selection +64 address units, (approximately 7.3mm
closer to the center of the record). There it changes direc-
tion and begins to lead out. (Switches to lead-out mode.)
@ During programmed selection playing
This mode moves the tonearm toward the center of the
record. Depending on whether the button is pushed during
the first selection of a program or during subsequent selec-
tions, the operations change as follows.
1. When pushed during the first selection of a program.
It moves the tonearm to the address of the first selection
+64 address units (approximately 7.3mm toward the
center of the record), changes direction, and starts to
lead out. (Switches to lead-out mode.)
2. When pushed during subsequent selections of a program.
It moves the tonearm toward the center of the record, to
the programmed selection address ~—16 address units
(approximately 1.8mm toward the outside edge of the
record), where it begins detecting the band. The next
operation depends on whether or not there is fader
standby or not.
1. When there is fader standby
While moving the tonearm toward the center of the
record it detects a leading singnal (4) as in figure 5-22.
The tonearm stops during this process and waits for a
fader down input signal in the UP position. (Switches to
the UP mode.)
22
2. Without fader standby
While moving the tonearm toward the center of the
record it detects a trailing signal Cy) as shown in figure
5-22. The tonearm stops when it has detected the signal,
and then lowers. (Switches to pre-down mode.)
With or without fader standby when the tonearm
doesn’t detect a band even after going to the program-
med selection address +16 address units (about 1.8mm
closer to the center than the band) then it begins leading
out. (Switches to lead-out mode.)
When the tonearm has not detected the selection band
after repeating the lead-in/lead-out sequence 4 times it
goes on to the next programmed selection.
Tonearm
Band signal <
Lead in
Band
differential
output ‘
TH
'
Record
QYYLIDII TIVO
surface \
{
Band
Fig. 5-22
In the lead in mode, as with the lead out mode, the R EP
and S/S switches work, but the other functions, program
switches (1 through 8) and the CLR only work during
programmed selection playing. The operations performed
after the commands are received are the same as with the
lead out mode.

5.4.6 Pre-down Mode
ond
The
pre-down
mode
is
the
mode
which
moves
the
tonearm
down
after
the
band
has
been
detected
by
the
lead-in
mode
(during
programmed
selection
playing
for
all
selections
except
the
first).
After
the
tonearm
goes
down,
it
traces
the
air
with
the
muting
ON
until
it
finds
the
center
of
the
band
(zero
cross).
Then
the
tonearm
goes
down,
a
landing
sensor
starts
the
tracking
when
the
tonearm
comes
to
rest
on
the
record.
When
the
zero
cross
input
H
is
detected
while
tracking,
the
muting
is
turned
off
and
normal
tracing
begins.
(Switches
to
down
trace
mode.)
H
Zero
cross
input
WT
|
7
mil
Band differential
output
Record surface
Band center
Fig. 5-23
In the pre-down mode: when the:
Fader standby input is ON and
Fader skip input is present,
the tonearm begins leading out (Switches to lead-out mode.)
In order to continue to the next programmed selection. In
the pre-down mode all of the input SWs function.
1. SWs 1 through 8
Selection repeat ispossible, and up to a maximum of 15
steps are programmable.
2. CLR switch
Clears all programming. After that it switches to auto-
matic playing.
3. REP switch
Turns the repeat function ON and OFF alternately.
4. EV switch
Starts the UP operation. (Switches to UP mode.)
5, 44, pPSW
Starts
the
+SKIP
and
—SKIP
operations.
(Switches
to
the lead out-mode.)
6. S/S SW
Clears programmed repeat(s) and starts the return
opeation. (Switches to the return mode.)
5.4.7 Down Trace Mode
® With fully automatic playing
It turns off the UP LED and sets the tonearm down.
During the first second of lowering the tonearm, the
elevation solenoid draws a current of 170mA. After that,
it draws 70mA.
The landing sensor determines whether or not the tone-
arm is in contact with the record. When it senses that it is,
it begins to watch for the end.
When it has detected the end, it checks the repeat LED,
and if there are any repeats, it counts them and begins the
return operation. (The maximum number of repeats is 8,
and the repeat LED will begin blinking when the number of
repeats reaches 8.) (It then switches to the return mode.}
During fader standby, it will begin the return operation
if there is fader standby input. (Switches to return mode.)
@ With programmed selection playing
As with fully automatic playing, the UP LED is turned
off and the tonearm is lowered. When the landing sensor
comes to rest on the record, it turns OFF the muting and
turns ON the tracking. With the position of the tonearm
within ¢125mm the sensor watches for the end.
When switching to this mode from the pre-down mode,
the muting is switches to OFF. (There are no other changes.)
While tracing with the tracking on, this mode watches
the tonearm position address and when it comes to the
band at the end of the selection it is playing — 16 address
units (approximately 1.8mm from that band toward the
outside edge of the record) it starts the band sensor.
When it detects the middle of a band (at the end of the
record it detects the end), it truns ON the muting, and lifts
the tonearm up in order, to continue on to the next selec-
tion in the program. (Switches to lead-out mode.) However,
if the fader standby input is ON, then the tonearm will
raise UP and switch to the lead-out mode for every selec-
tion.
During programmed selection playing and the down
trace mode when the:
Fader standby input is ON and
fader skip input is present.
then the tone arm begins the +SKIP operation.
23

PL-L7O
When all of the programmed selections have finished,
this mode checks the number of repeats and then, if there
are any, begins the repeat opeation. (Switches to the return
mode) (The maximum number of repeats is 8, and when
the number of repeats reaches 8 the REP LED begins blink-
ing.)
With down trace all of the functions work during program-
med selection playing, and with automatic playing all func-
tions work except the program switches and the clear SW.
1. REP SW
It turns the repeat function ON and OFF alternately.
2. EV SW
It starts the UP operation. (Switches to UP mode.)
3. S/S SW
It clears and programming and/or repeats and/or repeats
and starts the return operation. (Switches to the return
mode.)
4, 44, >> SW
@ With programmed selection playing
Starts the +SKIP and —SKIP operations. (Switches to
the lead-out mode.)
@ With fully automatic playing
Starts the UP operation. (Switches to the UP mode.)
The following function only operate with programmed
selection playing.
5. SWs 1 through 8
Selection repeat and up to 15 steps of additional pro-
gramming is possible.
6. CLR SW
Clears programmed selections and switches to auto-
matic playing.
5.4.8 Return Mode
mee
If the tonearm is DOWN (EV DOWN) then it lifts it UP,
stops the turntable, and returns the tonearm to the rest.
If the repeat SW is ON, (Except when turned to during
return) then at the same time that the tonearm returns to
the rest, it will start the turntable rotating in order to play
the next selection, and begin leading in the tonearm. (Swit-
ches momentarily to the lead-out mode and then to the
lead-in mode.)
At times other than these, (i.e. turning the REP SW ON
during return) the tonearm will be at the rest on standby
unless there is a command to start from one of the program
SWs or the S/S SW. (Switches to the rest mode.)
When the playing has finished, or has been terminated,
the program switches 1 through 8 still function while the
tonearm returns to the rest, and when the search operation
has not yet been completed, (i.e. the cover was opened
during tonearm return) then the search operation will
begin. (It will switch to the search mode.) If the search
e4
operation has been completed the lead-in operation will
begin. (It will switch to the lead-in mode.) When the cover
is open, the tonearm will remain at the rest until the cover
is closed.
In the return mode, the operable switches differ depend-
ing on whether it is a return that takes place during a
repeated selection, or a return that takes place at the end or
middle of a selection.
With a return during a repeated selection. (REP SW ON)
(During automatic or programmed selection playing.)
. REP SW
It turns the repeat function ON or OFF alternately.
(Cancels the repeat selection.)
. S/S SW
This clears the programmed selections and/or repeats.
(Cancels the repeat selection.)
(This works with programmed selection playing, but not
with fully automatic playing.)
. SWs 1 through 8
Selection repeat and up to 15 steps of additional pro-
gramming are possible.
. CLR SW
Clears all programmed selections and then switches to
automatic repeat playing.
With a return at the end or middle of a selection
1. SWs 1 through 8
Repeat input is possible, and up to 15 steps of new
programming is possible.
. CLR SW
This clears all programmed selections.
. REP SW
This turns the repeat function ON and OFF alternately.
. S/S SW
Clears all programmed selection and/or repeats.

5.4.9 UP Mode
eae eae
This
mode
lights
the
UP
LED,
turns
ON
the
muting
and
raises
UP
the
tonearm.
When
the
EV
chip
and
the
EV
bar
make
contact
and
the
stylus
leaves
the
surface
of
the
record,
the
landing
sensor
detects
this
and
turns
OFF
the
tracking.
Then,
after
about
1.1
seconds
it
detects
that
the
tonearm
has
moved
UP.
Function that will work when the tonearm is UP and
when it is moving UP differ depending on whether the play-
ing is fully automatic or programmed selection.
@ During fully automatic playing
1. The CLR SW and 1 through 8 don’t function.
2. REP SW
Turns the repeat function ON and OFF alternately.
3. EV SW
@ When the tonearm is moving UP .. .no response.
@ When the tonearm is UP......... the down oper-
ationtakes place.
(Switches to
down trace
mode.)
4, 44, >> SW
@ When the tonearm is moving UP . . .no response.
@ When the tonearm is UP......... the locate oper-
ation begins.
(Switches to
locate mode.)
5. S/S SW
It clears the repeats and starts the return operation.
(Switches to the return mode.)
@ During programmed selection playing
1. SWs 1 through 8
Selection repeat and up to 15 steps of additional pro-
gramming are possible.
2. CLR SW
Clears all programmed selections, and then switches to
fully automatic playing.
3. REP SW
Turns the repeat function ON and OFF alternately.
4, EV SW
@ When the tonearm is moving UP .. no response.
@ When the tonearm is UP........ the down oper-
ationtakes place.
(Switches to
down trace
mode.)
5. <<, >> SW
@ When the tonearm is moving UP .. it begins + SKIP
operations.
(Switches to the
lead-out mode.)
@ When the tonearmis UP......... no response.
6. S/S SW
Clears all programmed selections and/or repeats and
begins the return operation. (Switches to return mode.)
During the UP mode or when the tonearm is UP during
programmed selection playing and the
Fader standby is...........0200- ON and
Fader inputis .........-.-.-e0005 present,
then the tonearm down operation will begin. (It will switch
to down trace mode.)
5.4.10 Locate Mode
= Pe
renee
The locate mode is a passing mode that works during
programmed selection playing when the <4 SW or the
>» SW is pushed and held.
When the 44 SW is ON,
The tonearm moves toward the center of the record.
(up to approximately 6106mm)
When the »» SW is ON,
The tonearm moves toward the outside edge of the
record. (up to the rest)
When the <4 />»SW is OFF, the tonearm stops, and goes
into the UP position. (Switches to the UP mock. )
@ Do not Push 2 buttons at the same time with the
PL-L70, regardless of the modes. Noneof the input
will be accepted when two function buttons are
pushed at the same time. (However, it is possible to
change the 33/45 speed while performing another
function.)
25

L-L7O
Prog... . Programmed selection playing
Modes and the corresponding operable functions
Full... Automatic playing
Down trace mode
[== | — |-{-[-|-| —_
Pe ee
Locate/skip
Start/stop S/S +SKIP —SKIP
Tqnearm
elevation EV
<< >>
I
Tee esp
fs |
Prog i Full
(Cead-out)
CUP)
Program 1 through 8 Clear CLR Repeat REP
Search system Search system
(Search) (Lead-out )
(With cover open)
(—Do not push two function buttons at the same time.)
(* Clears 1 through 8)
(O= Yes, X = No)
Fig. 5-1
26