Sony TC-K570 User manual

Photo: TC-K677ES
SPECIFICATIONS
Recording system 4-track 2-channel stereo
Fast-winding time Approx. 90 sec. (with Sony C-60
cassette)
Bias AC bias
Heads Erasing head x 1 (S&F head)
Recording head x 1 (Permalloy head)
Playback head x 1 (LA head)
Motors Capstan motor x 1
(DC servo motor)
Reel motor x 1 (DC motor)
ASIST(mechanical drive) motor x 1
(DC motor)
Signal-to-noise ratio (at peak level)
oe ON ON
Type lV(Sony METAL-SLT/S)
Type II(Sony UX-S)
Total harmonic distortion
1.0% (with Sony METAL-SLT/S
cassette)
Frequency response (DOLBY NR OFF)
20—21,000 Hz (+3 dB, IEC)
20-—16,000 Hz
[+3 dB OVU (-4dB) recording]
20-19,000 Hz (+3 dB, IEC)
Type IV cassette
(Sony METAL-SLT/S)
Type II cassette
(Sony UX-S)
Type | cassette
| (Sony HF-S)
Wow and flutter
20—17,000 Hz (£3 dB,IEC)
pia
+0.09% W.Peak (IEC)
0.05% WRMS (NAB)
+0.14% W.Peak (DIN)
Dolby Laboratories Licensing Corporation.
ma} Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol! 0] are trademarks of
Canadian Model
AEP Model
UK Model
E Model
TC-K570
US Model
AEP Model
TC-K670
US Model
Canadian Model
UK Model
TC-K677ES
Model Name Using Similar Mechanism
Line inputs Sensitivity 77.5 mV
(phono jacks) input impedance | 47 k ohms
CD DIRECT INPUT! Input impedance | 47k ohms
Outputs
Tape Transport
Mechanism Type
Inputs
0.32 V at a load
impedance of
47 k ohms
Over 10 k ohms
0-1.25 mW ata
load impedance
of 32 ohms
Line outputs
(phono jacks)
Rated output levei
Load impedance
Headphones
(stereo phone
jack)
Output level
General
Power requirements US,Canadian model: TC-K570: 120V AC 60Hz 18W
TC-K670, K677ES:120V AC 60Hz 19W
AEP, Germany model: 220VAC~ 50/60Hz
UK model: 240VAC~50/60Hz
E model: 120, 220, 240VAC~50/60Hz 18W
Power consumption 19 W
Dimensions Approx. 430 x 123 x 300 mm (w/h/d)
(17 x 4’ x 117 inches)
including projecting parts and controls
Weight Approx. 4.9 kg (10 ibs 13 oz)
Supplied accessories
Audio connecting cords (2)
Design and specifications subject to change without notice.
Note
This appliance conforms with EEC Directive 87/308/EEC
regarding interference suppression.
STEREO CASSETTE DECK
ONY.
Dolby noise reduction manufactured under license from

TC-K570/K670/K677ES |
SAFETY CHECK-OUT
After correcting the original service problem,
perform the following safety check before releasing
the set to the customer:
Check the antenna terminals, metal trim, ‘‘metallized”’
knobs, screws, and all other exposed metal parts for
AC leakage. Check leakage as described below,
LEAKAGE TEST
The AC leakage from any exposed metal part to
earth ground and from all exposed metal parts to any
exposed metal part having a return to chassis, must
not exceed 0.5mA (S00 microampers). Leakage
current can be measured by any one of three
methods.
1. A ‘commercial leakage tester, such as the
Simpson 229 or RCA WT-540A. Follow the
manufacturers’ instructions to use these instru-
ments.
2. <A battery-operated AC milliammeter. The Data
Precision 245 digital multimeter is suitable for
this job.
3. Measuring the voltage drop across a resistor by
means of a VOM or battery-operated AC volt-
meter. The “limit” indication is 0.75 V, so
analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa
SH-63Trd are examples.of a passive VOM that
is suilable. Nearly all battery operated digital
multimeters that have a 2V AC range are
suitable. (See Fig. A)
To Expased Metal
Parts on Set
AC
voltmeter
{0.75 V)
0.15 uF a
eae
= Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK /\ OR DOTTED
LINE WITH MARK /\ ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
TABLE OF CONTENTS
Section Title Page
SECTION 1. GENERAL: = = * «© = = ee wie Ge xe: ee bat SNS 3
SECTION 2, DISASSEMBLY: = + * «= = @ 8 We a 4
SECTION 3. PIN DESCRIPTION + © © © = = © «© © ww «© 8
SECTION 4. ADJUSTMENTS
4-{. Mechanical Adjustments = © 5 © #2 # © + Q
4-2, Electrical Adjustments * " "°° = ss = 12
SECTION 5. DIAGRAMS
5-1,
Printed
Wiring
Boards
+
*
=
©
#
s
©
#
©
16
5-2.
Circuit
Boards
Locations
=
+
ss
ee
* &
71
5-3,
Semiconductor
Lead
Layouts"
*
"
*
+
5
=
|
5-4, Schematic Diagram
—Audio Section—- © © * © 8 © ee ee we 22
5-5. Schematic Diagram
~System Control Section- * * * * * As)
SECTION 6. EXPLODED VIEWS
6-1.
Chassis
Sections
*
*
*
*
* *
* #
©
#
#
«
29
6-2,
Front
Panel
Sections
=
*
* *
*
©
ee
30
6-3.
Mechanism
Section
}.5
*
« « =
eee
2
3B]
6-4.
Mechanism
Section
2.*
+ *
*
©
«©
©
«©
©
2 «
39
SECTION
7.
ELECTRICAL
PARTS
LIST:
©
=
=
©
es
©
©
« »
33
MODEL IDENTIFICATION
—
Specification
Label
—
TC-K570
TC-K670
TC-K677ES
SONYoe MODEL NO.
STEREO CASSETTE DECK
SERIAL No.
MADE IN JAPAN
US Canadian model: TC-K570: AC120V 60Hz 18W
TC-K670, K677ES: AC120V 6OHz 19W
AEP, Germany model: AC220V~50/60Hz
UK model: AC240V~50/60Hz
E model: AC120, 220, 240V~50/60Hz 18W
ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!
LES COMPOSANTS IDENTIFIES PAR UNE MARQUE /\
SUR LES DIAGRAMMES SCHEMATIQUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA SECURITE
DE FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIECES SONY DONT LES
NUMEROS SONT DONNES DANS CE MANUEL OU
DANS LES SUPPLEMENTS PUBLIES PAR SONY.

SECTION 1
| TC-K570/K670/K677 ES
G E N E RAL This section is extracted
. from instruction manual.
Identification of Front Panel Parts
For details, refer to the page number indicated in @.
[1] POWER switch
[2] Cassette holder
[3] Counter buttons
RESET button ©
MEMORY button ©
[4] LINEAR COUNTER ©
[5] MEMORY indicator ©
[6] PEAK LEVEL METER @
TAPE TYPE indicator @
DISPLAY MODE button @
[9] MONITOR button @
MPX FILTER switch @®
BALANCE control ©
(12) REC (recording) LEVEL contro! © ®
DOLBY NR (noise reduction) switch @ ©
PHONE (headphones) LEVEL control @
HEADPHONES jack (stereo phone jack) @
INPUT selector ©
/. *Remote control sensor’
REC LEVEL
mex Siren
mogior
.
BA E
(o)- -
v a .
CALIBRATION rm aateY er °
*% aK
~) @) @
mecyent eu p _, Wehr
ir o y w=
Ge) @ ®
“4
a CT TE VT
[17] REC (recording) LEVEL control for calibration ®
BIAS contro! ®
Tape operation buttons
<4 (rewind) button
> (fast-forward) button
@ (stop) button
B> (play) button
IE PAUSE button
O REC MUTE (record muting) button ®
@ REC (recording) button
20| & OPEN/CLOSE button
21] TIMER switch ®
*Remote control sensor
You can remotely control this cassette deck with:
-—- A remote commander that came with a Sony amplifier or
receiver if it has the fal mark and cassette deck control
capability.
— An optional Sony remote commander with the lal mark
and cassette deck control capability.

TC-K570/K670/K677ES |
— SECTION 2
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
MECHANISM BLOCK
Oscrews (M3 x 8)
Oscrews(M3 x 8)
oN,
on
t
(
tk
L
.
UF
;
SX
@+
BVIT3
x6
@+BVTP3x8 |
CASSETTE HOLDER
@fush lever (lifter) in the
direction of arrow and remove
cassette
holder.
AE
A.
CGAL
27S
@cassette lid
Otension spring

ORNAMENTAL PLATE CAPSTAN MOTOR/FLYWHEEL
(TC-K570)
@ Push lever (lifter) in the
direction of arrow and remove
ornamental plate.
@Oscrews
Hook belt here
temporarily when
~~, reassembling.
Sa
Spacer
t
Py
+
PTPWH2
x
25
¢
@ornamental plate
@flywheel
P) a7 se ee @Qbracket(thrust retainer R) OW O+87P2.6x5
CAPSTAN MOTOR/FLYWHEEL
(TC-K670/K677ES)
PINCH LEVER
(TC-K570)
® \ x6
@washer—____ cS
Olever(FR) @washer eae :
/ a PAO
:
a
a
®+PS3x6
Obelt(capstam
V4)
@release claw Q @ + PTPWH2 25
Olever(pinch)
PINCH LEVER i
(TC-K670/K677ES) \ C :
. Vi 7
@lever(pinch
T)
(jo
@capstan
motor
Qwasher eS 0O+PS3x6
@bracket
| V.
Olever(pinch
S)
(thrust
retainer
V4)
ee ee
@lever (PS) COR ie om
a>
| TC-K570/K670/K677ES
REEL AND ASSIST MOTORS
@+8B7TP2x 18
O+8B7P2x18 ‘o
E
g
H
@bracket(motor R) ass‘’y
Align boss of mode cam to the point
when reassembling.
“bai
Ca
boss \ a - of PAA Z
mode cam LY,
FL selection lever
mode cam
Hook
belt
here
Align
the
line
on
mode
cam
to
temporarily when the tip of selection lever.
reassembling.
+B2.6X6.5
@assist motor
Spacer(mot
e gion ‘bracket(motor R) ass’y.
Oree/ motor board @ree/ motor

TC-K570/K670/K677ES
SECTION 3
PIN DESCRIPTION
©1C701 M50941-483SP(MICRO COMPUTER)
The M50941-483SP function are-described below.
[rine
[178
[rt
1 | Vrer Internal A/D port reference voltage input.
2 KEY 7 Key input port. OV = OPEN/CLOSE, 1V = STOP, 2V = REW, 3V = FF, 4V = REC.
3 KEY 6 I key input port. OV = PLAY, IV = PAUSE, 2V = REC MUTE. .
4 KEY 5 I Key input port. OV = RESET, 1V = MEMORY, 2V = DISPLAY MODE, 3V = MONITOR.
5 METER-L | Signal input for level meter-L.
6 METER-R I Signal input for level meter-R.
7 TIMER I Timer REC/PLAY switch input. OV = TIMER REC, 1V = TIMER PLAY, 2V = OFF.
8 T. PULSE I Take-up reel base sensor input.
9 S. PULSE I Supply reel base sensor input.
10 AMS. SIG I AMS signal input. No song detected = Low. Song detected = High.
1] BIAS 0 Bias oscillation on and off control.
12 MO3V 0 Motor speed control. STOP/PLAY = Low, FF/REW = High.
18 M04, 5V 0 Motor speed control. STOP/PLAY = High, FF/REW = Low.
14 MO-FWD 0 Reel motor rotates.
15 MO-REV 0 Reel motor rotates in reverse.
16 MO-DOWN 0 Head base DOWN output of the mechanical block.
17 MO-UP 0 Head base UP output of the mechanical block.
18 HALF-SW I HALF switch input of the mechanical block.
19 REC-SW I REC switch input of the mechanical block.
20 DOOR-SW I DOOR switch input of the mechanical block.
21 CLOSE-SW I CLOSE switch input of the mechanical block.
22 OPEN-SW I OPEN switch input of the mechanical block.
23 POWER-OUT 0 “Low” for power off procedure after POWER switch is turned off.
24 POWER-IN I Power (AC) off detection.
25 | Remote control signal input.
26 oe GND
27 I System reset input.
28 I Clock input (4. 19MHz).
29 0 Clock output.
30 _ Not used.
31 zc Not used.
32 Ves = GND
33 Not used.
34° | PATS I
| | Rotary encoder input to detect the position of the head base of the mechanical block.
37 PATO I
38 ZV = Power supply for driving the fluorescent indicator tube.
39 FL~p 0
| | | Segment data output for the fluorescent indicator tube FL751.
54 FL-a 0
55 FL-G5 0
| | | Common data output for the fluorescent indicator tube FL751.
59 FL-G1 0
60 MONI TOR 0 Source monitor control. Low = TAPE, High = SOURCE.
61 REC-MUTE 0 REC MUTE control. Low = MUTE.
62 LINE-MUTE 0 LINE MUTE control. Low = MUTE.
63 AVec i Analog power supply(+5V).
64 Vec = Power supply(+5V).

SECTION 4
ADJUSTMENTS
1. MECHANICAL ADJUSTMENTS
PRECAUTION Adjustment Position: As seen from the cassette,
side (top) and MD as seen
1. Clean the following parts with a denatured-alcohol-moistened swab: TC-KB70/KB77ES
record/playback head pinch roller head on (bottom).
erase head rubber belts
capstan idler
2. Demagnetize the record/playback head with a head demagnerizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the parts
adjusted.
Tape Path Adjustment
Note: When using the adjustment methods for other
than replacement reasons, please do not
tamper unnecessarily with the adjustment
screws or the erasehead because either the Supply pinch Takeup pinch
supply pinch roller guide or the record/ roller Erasehead Record/playback roller
playback head will be made the standard tape head
paths. Moreover, when it is necessary to
adjust and replace two or more of any of the
heads and/or pinch rollers, replace them one TC-K570
by one, completely taking out the first tape
path, and then replacing the second one.
(TC-K670/K677ES)
Preparation :
1. Mirror cassette CQO09C 8-909~708-01
(or CQO012C 8-909-708-02)
If one does not have this, cut out the sections of
a 120-minute cassette shell as indicated below head @
and use that cassette.
Record/playback Takeup pinch
head roller
Definition of Terms: The figures are of a record/
playback head.
Height Declination Depth Azimuth
Cut out
2. Phillips screwdriver (medium-size) :
For the head adjustment screws
Blade-type screwdriver (large-size) :
For the supply pinch roller adjustment screws
3. Pen light
4, WS-48B (3 kHz, 0 dB)
5. P-4-A100 (10 kHz,-10 dB)

Adjustment Method :
Supply Pinch Roller! :
Note: Only perform this adjustment when the supply
TC-K670/K877ES
pinch roller is to be replaced.
Insert the mirror cassette and put the unit in
record/playback mode.
Check to see whether the tape is curling at the
record/playback head guide or the pinch roller
guide.
If it is curling, remove the curl by adjusting the ®
tape curl adjustment screw. Then, check that the
tape is running past the middle of the erasehead.
Record/ playback Head
Note: Only perfom this adjustment when the record
/playback head is to be replaced.
Insert the mirror cassette and put the unit in
record/ playback mode.
(Height Adjustment) Check to see if the tape is
curling at the tape guide of the head. If it is
curling, tighten screws @, ©, and @, respectively
by the same angle, moving the head so that it
remains at the same angle throughout the
procedure. If it curls on the bottom side of the
mirror cassette (actually the inner side), tighten
all the screws equally; but loosen them if the
tape begins to curl on the top side (outer side).
ane = , Outside
normal Curling on the Curling on the
(record/playback head inner side. outer side.
as seen from the side Tighten screws Loosen screws
of the erasehead.) 4, ©, and @. @,®, and @.
(Declination Adjustment) While in the record/
playback position, set the back tension to 0 (wind
the supply reel with something thin like a pencil
in a counterclockwise direction) and make sure
there is no curling or shifting (shifting up/
shifting down) at the guide of the record/
playback head.
Because shifting can only occur due to a difference
in the width of the tape and that of the tape guides
(curling will otherwise occur), it is necessary to pay
close attention since it can be easily overlooked.
When there is a shift, tighten screws © and @ equally
and change the declination of the head. If the tape
is shifting up, tighten the screws, and if it is shifting
down, loosen them.
Repeat the adjustments in steps 2 and 3 and fine
adjust the height and the declination.
(Preliminary Azimuth Adjustment)
After demagnetizing and cleaning the adjustment
head, play back WS-48B (3 kHz, 0 dB).
Turn screw @ so that the reading on the level
meter of the unit or that of the level meter
connected to LINE OUT is maximized.
If the screw is turned at least half a revolution,
repeat the adjustments from step 1.
(Tape Path Check) Connect the oscilloscope to
LINE OUT and play back P~4-A100 (10 kHz, -10
dB) to display a resurge waveform. After 20
seconds of record/playback (after the tension
within the loop has been increased sufficiently),
make sure the variation in the resurge is within
+ 90 degrees (within +45 degrees is desired).
If the variation is greater than this, it is because
the declination and/or the height adjustment is
not perfect. Repeat the adjustments from step 1.
test tape
P-4-160
(10 kHz, ~10 dB) Oscilloscope
L-CH 47kQ
LINE CUT
Oscilloscope Resurge Waveform
OOAOOQV®
In Phase 45° cases 180°
SRL). coli en
Good ae a

> TC-K670/K677ES
Note:
Only
perform
this
adjustment
when
the
erasehead is to be replaced.
Insert
the
mirror
cassette
and
put
the
unit
in
record/
playback
mode.
(Azimuth
Adjustment)
Adjust
the
azimuth
of
the
erasehead
by
adjusting
screws
@
and
@
so
that
the
tape
runs
as
evenly
as
possible.
pe
tor
TT
Tighten @ Tighten @
Loosen @ Loosen @
(The
erasehead
as
seen
when
erasing
the
mirror
cassette.)
Normal
(Height adjustment) Turn screws ®,@, and @ all
by the same angle so that the portions of the
erasehead visible at top and bottom are nearly
of equal width. If the width at the top is greater,
tighten the screws; if the width at the bottom
is greater, loosen the screws.
Erasehead
(The
erasehead
as
seen
through
the
mirror cassette.)
4.
Tape —»
a Cay
Make these the same width.
(Declination Adjustment) Leaving it in the
playback position, put the back tension to 0 and
make certain the erasehead part and supply pinch
roller guide part do not shift. If there is a shift,
turn the screw ® and change the declination.
Looking at it using the mirror cassette, if the
tape shifts up, tighten the screw, and if it shifts
down, loosen the screw.
Repeat the adjustments beginning with step 2 and
fine adjust the height and declination. And make
sure the tape does not curl up on the pinch roller
guide or the guide part of the record/playback
head.
(Depth Adjustment) In order to make the entire
head play the tape smoothly, and to make sure
the depth of the erasehead is neither too shallow
nor too deep, loosen screw @ a bit,
About 0.56 mm
ae _}
T I oa
Normal Erasehead ~~
|
Record/ playback
“fT
|
7
>
head
Not deep enough Too deep
Check
1. Check to make sure that there are no curls or
shifts throughout the whole tape path and that
the tape runs smoothly.
2. Reapply the locking compound to the adjusted
screws. (The locking compound should only be
applied to screw © after the azimuth has been
adjusted.)
TORQUE MEASUREMENT
Torque Torque meter
C Q-102C ‘28-60 g- cm(0, 39-0. 83 02 + inch)
FWD
CQ-102C
TC-K570:1-5
g
+
cm(0.
014-0.
069
oz
+
inch)
Back
tension
|
Yo-ro/eorrs:7-1
g
+
cm(0.
097-0.
15
0z
*
inch)
PF, REW| CQ-201B | 85-90 g + cm(0, 9-1. 25 02 « inch)
Meter reading
Pinch Rolier Pressing Force Measurement
Mode : playback
Hook needle of the tension gauge to the pinch roller
shaft and push back pinch roller to detach it from
capstan. Then, return it gradually to capstan and
read the gauge when the pinch roller begins turnning.
Standard Limits :
Tape-up side .
TC-K570 : 210-320 g(7. 4-11.3 02)
TC-K670/K677ES : 270-350 g(9. 5-120 02)
Supply side
TC-K670/K677ES : 180-280 g(6. 4-9.9 oz)
capstan
pinch roller
tension gauge

2. ELECTRICAL ADJUSTMENT
Note: The adjustment should be performed in the order given in the
service manual. As a rule, adjustments about playback should be
performed before those about recording.
The adjustments should be performed before: for both L-CH and
R-CH.
* Switches and controls shoud be set as follows unless otherwise
specified.
DOLBY NR switch: OFF
MPX FILTER switch: OFF
MONITOR switch: Tape
* Standard Record:
Deliver the standard input signal level to the input jack and set the
REC LEVEL control to obtain the standard output signal level.
~ Record Mode —
AF OSC
LINE OUT
LINE IN
Standard Input Level
LINE IN|
source impedance 10kQ
___ input level 0.25 V (- 10 dB) |
Standard Output Level
LINE OUT
[toad impedance |_—a7EQ
adv (= 5B)
Test Tape
|_P-4-A100 | 10 kHz, ~104B | Azimth Adjustment _|
PB Level Adjusumet
WS-48B
Tape Speed Adjustment
Test Mode
This
set
will
get
into
test
mode
by
shorting
the
pins
of
CNE707
(TEST)
on
MA
I N(A)
board
before
turning
the
power
on.
Record/Playback
Head
Azimuth
Adjustment
Porcedure:
1. Mode: FWD playback
Tast jee
P-4-A100
(10
kHz,
~
10
dB)
VTVM
LINE OUT
2. Turn the adjustment screw for the maximum output levels. If these
levels do not match, turn the adjustment screw until both of output
levels match together within | dB.
within
L-CH
peak within
1 dB
Da R-CH
ie peak
crew , am —
position angle
L-CH peak R-CH peak
3. Phase Check
Mode: playback
test tape
P-4-A100
(10 kHz, — 10 dB)
L-CH
A7kQ4
oscilloscope
LINE OUT
Screen pattern
in phase 45° 90° 135° 180°
bo nmnnmne aamenncentll
Good Wrong
4. After the adjustment, lock the screws with locking compound.
Adjustment Location: Record/Playback head
TC-K570 TC-K670/K677ES
Adjustment
screw
Adjustment
screw