Sony TC-K808ES User manual

SERVICE MANUAL
steray
IC-
K808kS
AEP Model
Dolby noise reduction manufactured under license from
Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol DJ are trademarks of
Dolby Laboratories Licensing Corporation.
TC-K222ESA/
Model
Name
Using
Similar
Mechanism
TC-K890ES
TCM-200014
SPECIFICATIONS
Recording system
Fast winding time
Bias
Heads
Motors
4-track 2-channel stereo
Approx. 90 sec. (with Sony C-60 cassette)
AC bias
Erasing head x 1 (S&F head)
Recording head x 1 (SD head)
Playback head x 1 (SD head)
Capstan motor x 1 (direct drive linear torque
BSL motor)
Reel motor x 1 (DC motor)
Assist (mechanism drive) motor x 1 (DC
motor)
Signal-to-noise ratio (at peak level and weighted)
Cassette
(Dolby NR off) |
Type IV | Type II | Type |
Wow and flutter
+ 0.05% W.Peak (IEC)
0.025% W.RMS (NAB)
+ 0.07% W.Peak (DIN)
Inputs
Line
inputs
Sensitivity
0.16V
(phono
jacks)
|
Input
impedance
47
k
ohms
Outputs
Line outputs
(phono jacks)
Rated output level 0.5 V at a load impedance
of 47 k ohms
Load impedance Over 10 k ohms
| 59 dB | 57 dB
S/N ratio improvement (approximate values)
With Dolby B NR on: 5 dB at 1 KHz; 10 dB at 5 kHz
With Dolby C NR on: 15 dB at 500 Hz; 20 dB at 1 kHz
With Dolby S NR on: 10 dB at 100 Hz; 24 dB at 1 kHz
Harmonic distortion
0.4% (with Type |, 160 nWb/m, 315 Hz,
3rd H.D.)
1.5% (with Type IV, 250 nWb/m, 315 Hz,
3rd H.D.)
Frequency response (Dolby NR off)
Type IV cassette
20 - 21,000 Hz (+3 dB, IEC)
20 - 16,000 Hz [+3 dB (-4 dB recording)]
Type !I cassette
20 - 19,000 Hz (+3 dB, IEC)
Type | cassette
20 - 17,000 Hz (+3 dB, IEC)
Type IV : Sony METAL-S or ES-IV
Type Il : Sony UX-S or UX
Type! : Sony HF-S
MICROFILM
Headphones
(stereo phone jack)
0-3 mW ata load
Output level
impedance of 32 ohms
General
Power requirements
Power consumption
Dimensions
Mass
Supplied accessories
220 - 230 V AC, 50/60 Hz
26 W
Approx. 470 x 135 x 350 mm (w/h/d)
including projecting parts and controls
Approx. 8.0 kg (17 Ibs 11 0z)
Audio connecting cords (2)
M3x8 screws (4)
Design and specifications are subject to change without notice.
STEREO CASSETTE DECK
SONYY.

TABLE OF CONTENTS
Section Title Page
Te “GENERAL. 0icscecsccescceeceseses ii dicreresdeiideccccesnasesesdaneeds 3
2. DISASSEMBLY
Cassette Holder Tete ee eee s ee eenan nance ceeee seas tena seeeusnreneserceranees 4
Ornamental Plate Came m reece eee ne nes ee rete nace nsneeseeereeeesesererecssaes 4
Pinch Lever/Lever (033°) RO 4
Comparator Board/Capstan Board/Fly wheel/FG Board ++++-+++++++ 5
MD Board POOR Teer ease tener eer eaneeeeeseeneseesaeeeeeeHaDeseeseveneneceeene 5
Reel Motor Board PEO e Reema eee onan es eens tenses eee seeesereeeeseeusesserenane 5
3. MECHANICAL ADJUSTMENTS ..-------cccccscseseeeeee 6
4. ELECTRICAL ADJUSTMENTS. ---ecccccccrceessssecceeens 9
5. DIAGRAMS
IC Pin Assignment srrrcsssrreecseeseecescnsescecseeereessaenseesenene
5-1. Semiconductor Lead Layouts sr+rss+++++eeeeerees
5-2. Circuit Boards Location Danae nsevenerenesenee
5-3. Block Diagram -+-+++++++++++ oo ecenceccccscerens
5-4. Printed Wiring Boards— Audio Section— ---
5-5. Schematic Diagram — Audio Section— -++++++++++seeee+s
5-6. Schematic Diagram — System Control Section— +++++ 29
5-7. Printed Wiring Boards— System Control Section— -++ 33
5-8. Schematic Diagram —DOLBY S Section— srrrerreeees 37
6. EXPLODED VIEWS
6-1.
6-2.
6-3.
6-4.
7. ELECTRICAL PARTS LIST ---e--::csccsscsesseseessees 43
SAFETY-RELATED
COMPONENT
WARNING!!
COMPONENTS
IDENTIFIED
BY
MARK
A
OR
DOTTED
LINE
WITH
MARK
A
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.

SECTION 1
GENERAL
fo l=yatiaydiare mal
Parts
Front Panel
POWER switch
TIMER switch
Peak program meter
Automatic Music Sensor (AMS) buttons
Linear counter
COUNTER buttons
RESET button
MEMORY button
7} Cassette holder
9} Remote control sensor”
10] MONITOR button
11] BALANCE control
12] REC (recording) LEVEL contro!
[13] PHONE (headphones) LEVEL control
o>} [on] [] [co] [no] [—
*You can remotely control this cassette
deck with:
— Aremote commander that came
with a Sony amplifier or receiver if it
has the [ld mark and cassette deck
control capability.
— An optional Sony remote
commander with the ld mark and
cassette deck control capability.
[14] HEADPHONES jack (stereo phone jack)
f5] DIRECT button
[16] REC EQ CAL (recording equalizing
calibration) switch (LOW, NORMAL,
HIGH)
(17) REC (recording) LEVEL control for
calibration
(18) BIAS control
19} DOLBY NR (noise reduction) switch
20} CALIBRATION button
21) MPX FILTER button
22) 2 OPEN/CLOSE button
23] Tape operation buttons and indicators
<4 (rewind) button
b> (play) button and indicator
bP (fast-forward) button
@@ (stop) button
IIE PAUSE button and indicator
O REC MUTE (record muting) button
@ REC (recording) button and indicator
i

SECTION 2
DISASSEMBLY
NOTE: Follow the disassembly procedure in the numerical order given.
CASSETTE HOLDER
® tension spring
O lever (joint)
© cassette holder
ORNAMENTAL PLATE
@ Push lever (lifter) in the (i
direction of arrow and remove ~
ornamental plate. ~ Cy
. +.
30)
® ornamental plate Z ry
i i re |
Due
Ny
PINCH
LEVER/LEVER
(FR2)
@
two
screws
(B2.6X6)
® leaf spring
© lever (FR 2)
© washer
® screw
St
(BVTT3X5)
Noo
35
@avesher
@ lever (pinch T)
@ lever (pinch S,
2 4 @ nut

COMPARATOR BOARD/CAPSTAN BOARD/FLYWHEEL/FG BOARD
@® two screws (PS3X8}
@ two screws ~ . . © two screws (BVTT3X 5}
(PSS%8) @ CAPSTAN board
O bracket
(thrust retainer)
© two screws
(PS3X 8)
@ COMPARATOR
board
MD BOARD
@
screw
@
belt
(capstan)
(PTPWH2X
25)
©
two
screws
©
two
screws
@ four screws (PTPWH2x 18) (PS3X8) (BVTT3X 5)
$1001
rotary encoder
Align -mark to the line when reassembling.
Align boss of mode cam to the point
a
ma
when
reassembling.
Ae”
\
n
selection lever
es; boss( “ penne REEL MOTOR BOARD
%& mode cam ‘~___ Align the line on mode cam to
™. Hook belt here the tip of selection lever, when
temporarily when feassembling.
reassembling.
@ four screws
(P2.6X6.5)
@ REEL MOTOR board
hs

SECTION 3
MECHANICAL
ADJUSTMENTS
+ Refer to page 8 for Adjustment Location.
PRECAUTIONS
Clean
the
following
parts
with
an
alcohol-moistened
swab.
2.
Demagnetize
the
record/playback
heads,
erase
heads
and
the
(tape
sliding
surface)
capstan
using
the
head
demagnetizer.
Do
not
use
a
magnetized
screw
driver
for
the
adjustments.
After
the
adjustments,
apply
suitable
locking
compound
to
the
parts
adjusted.
The
adjustment
should
be
performed
with
the
rated
power
supply
Tape
guide
(S)
voltage
unless
otherwise
noted.
Capstan
Pinch roller (T)
Pinch roller (S)
Erase heads Record/playback heads

Tape Passing Adjustment
Note: For the following adjustments, use the jig as far as possible.
Although the following methods are operable without using
the jig, precise adjustment may not be completed, for example
no compatibility to other decks is available even if self
recording and playback is OK.
In these adjustments, either the pinch roller guide in the S
side or the record/playback head guide is referred to for tape
pass. Therefore, do not unnecessarily rotate the adjustment
screws including those of the erase heads unless any one is
replaced. When 2 or more heads or pinch rollers out of these
2 heads and pinch rollers are to be adjusted or replaced, use
the jig for the adjustments or replace one at first and then take
complete tape pass and then replace the second one.
Head height adjusting jig : apex
Preparation:
* Mirror cassette CQO09C 8-909-708-01
(Or CQ012C 8-909-708-02)
If it is not avaliable, cut a part of the half of a 120 minute cassette
tape and use.
i Cut and use.
¢ Plus screw driver
Medium size .... Apply to the head adjusting screw.
Minus screw driver
Large size .......... Apply to the pinch roller adjusting screw in
the S side.
* Pen light
* WS-48B (3kHz, 0dB)
« P-4-A100 (10kHz, —10dB)
Definition:
The following view relates to record/playback heads.
Azimuth
Height Thrust
Tilting
For the locations of the adjusting screws, see the view “adjustment
location” in the lower right corner of Page 8.
Procedure:
Pinch roller in the S side
Note: It should be adjusted only when the pinch roller in the S side
is replaced.
Mount the mirror cassette and set the equipment to playback state.
Check that the tape is curled in the pinch roller guide or the guide
of the record/playbakd heads.
If curled, remedy it by rotating the tape curl adjusting screw @. At
tha time, check that the tape runs near the center part of the erase
heads.
Nn =
Record/playback heads
Note: The heads should be adjusted only when the record/playback
head is replaced.
1. Mount the mirror cassette and set the equipment to playback state.
2. (Height adjustment) Check that the tape is curled in the tape guide
of the heads. If curled, rotate screws @, @ and @ in the same
angle and move the entire heads parallel. Check the mirror cassette
where there is curling and, when curling exists in the lower side
(actually in the deep side), tighten all screws slightly. If curled in
the upper (your) side, loosen them.
' ' : ‘
Far side — ea — Your side fe ; i of
Normal Curled in the Curled in
(record/playback far side. your side.
head viewed from t L
the erase head side) Tighten screws Loosen screws
©, © and @. 0, © and @.
3. (Adjustment of tilting) Adjust back tension to 0 still in playback
state (loosen the tape by rotating the reel in the S side using a small
tip such as a pencil), and check that there is no curling or snaking
(up or down) in the guide of the record/playback heads. Snaking of
the tape may occur only within the range of a difference in the
widths of the tape and the tape guide (it curls when tate slacks
more than the range). Therefore, carefully check it because it may
often be overlooked.
If the tape is snaking, rotate screws @ and @ in the same angle and
change the tilting of the heads. Tighten or loosen the screws to
remedy up or down snaking, respectively.
4. Repeat the adjustment 2 and 3 again and converge the height and
tilting to suitable positions.
5. (Tentative adjustments of azimuth) Demagnetize and clean the heads
and playback WS-48B (3kHz, OdB).
Rotate the screw @ so that the pointer of the level meter of the set
or connected to LINE OUT becomes maximun. If the screw is rotated
more than 1/2 turn, repeat the adjustments again from | -
6. (Checking of tape pass) Connect an oscilloscope to LINE OUT,
replay P-4-A100 (10kHz, —10dB) to describe Lissajov’ s figures.
At about 20 seconds after beginning playback (the temion in the
loop becomes stable), check that the variation of the Lissajou’s
figures occur within £90° (more preferably within +45°) If beyond
+90°, adjustments of tilting or height will not be complete, so
finely adjust the equipment again from 1.

Standard adjustment tape
P-4-A100
(10kHz, —10dB)
L-CH
47kQ
Oscilloscope
LINE OUT
Oscilloscope Lissajous’ Figures
OADO@OOQ
Same phase 45° 90° 135° Pe
boon aunt
Good
eae good
Note: The heads should be adjusted only when the erase head is
replaced.
1. Mount the mirror cassette and set the equipment to playback state.
2. (Azimuth adjustments) Adjust screws @ or @ so that the tape runs
as parallel to the erase heads as possible.
Co >)
per To>
Normal
Tighten @
and loosen @.
Tighten @
and loosen @.
(Erase head viewed in the
mirror cassette)
3. (Height adjustment) Rotate screws ®, @ and @ in the same angle
so that the widths of erase heads seen in the upper and lower sides
of the tape become essentially the same. If the width in the upper
or lower side is larger, tighten or loosen the screws, respectively.
Erase head (viewed in the mirror cassette)
oe
Tape —»
aa -tO J
Adjust to the same widths.
4. (Adjustments of tilting) Adjust back tension to 0 still in playback
State and check that there is no snaking in the erase heads and
pinch roller guide in the S side. If there is, change tilting by rotating
the screw ®. When the tape moves up or down in the mirror tape,
tighten or loosen the screw, respectively.
5. Repeat the adjustments again from 2. and converge the height and
tilting to more suitable values. And, check that there are no tape
curls in the pinch roller guide and the guide of the record/playback
heads.
6. (Adjustments of thrust) Slightly loosen the screw © and finely
adjust it so that the tape smoothly runs over the entire surfaces of
the heads by adjusting the thrust of the erase heads to an optimum
value relative to the tape.
About 0.5mm
gee |. et.
™
Normal Erase —='
heads
Record/playback
heads
Too shallow Too deep
1, Check that the tape smoothly runs over the entire tape pass without
curling or snaking.
2. After the adjustments, apply the locking compound to the screws
adjusted (apply the compound to the screw @ only after the final
azimuth adjustments are completed).
Adjustment Location:
The following views relate to those in the mirror cassette (upper) and
MD viewed from your side (lower).
Pinch roller in
the T side
Pinch
roller
in
Erase
Record/playback
the
S
side
heads
heads

SECTION 4
ELECTRICAL ADJUSTMENTS
0dB =0.775V
1, Perform adjustment in the order listed below. (As a rule, adjust the
record system after adjustment of playback system has been
completed.)
2. Adjust and measure both channels unless otherwise specified.
3. To perform simultaneous record and playback, select recording mode,
and set MONITOR switch to TAPE, then play back immediately the
recorded signal to take out from LINE OUT.
« Switch position
DOLBY NR ceccecscecercecccnseceesescencecsesscscsserecs OFF
MPX
FILTER
secccsssesescssresescccnevccececesssorececses
OFE
TIMER
ceccessteteccscscnccceesescasessccucrersessseseseerens
OFF
MONITOR ceccecrccssccrcecccecescecencsencccerertcacesens TAPE
CALIBRATION
ao
DIRECT
crreecetsceeeseeensssesenenerensesensscussecnersecaoes
OFF
BIAS
cecsssecereesesenasssscssensseccssenes
CENTER
CLICK
REC
LEVEL,
«csttessseeeseseesereeenseaeoe
CENTER
CLICK
BALANCE
cereessesteeeeeserseccceneeenenes
CENTER
CLICK
« Standard Record
Adjust the REC LEVEL (RV502) and BALANCE (RV501) controls
so that the 1/O signal levels specified below can be attained.
Record Mode
AF OSC
©
[e)
Attenuator 10kQ
6002
LINE OUT
LINE IN
Standard Input Level
Input pin
LINE IN
10kQ
0.25V (—10dB)
LINE OUT
47kO
0.32V (—7.7dB)
Signal source impedance
Input signal level
Standard Output Level
Output pin
Load impedance
Output signal level
Test tape
Tape speed/WOW check
10kHz, — 10dB Azimuth adjustment
P-4-L300 PB level adjustment
Torque Adjustment
1. Load the torque measuring tape CQ-102C, and play back. Adjust
RV8O1 so that the torque meter reading is 40+5g-cm. (0.556 +
0.069 oz-inch)
2. After adjustment, measure back tension and FF/REW torque, and
make sure that measured data satisfies the specification.
Torque Torque meter Meter reading
CA-102C | 35—45g-cm (0.49~-0.62 oz: inch)
FWD back tension CA-102C 7—11g-cem (0.10—0.15 oz: inch)
CQ-201B | 65—90g-cm (0.91— 1.25 oz inch)
Tape Speed/WOW Check
Procedure:
Test tape
WS-48B (3kHz OdB) Frequency counter
& WOW meter
LINE OUT
L- or R-CH
1. Play back the top of test tape to measure its output frequency and
WOW value.
2. Invert test tape and perform same measurement, then check for
difference between top and end of tape.
Specification:
Tape speed deviation : within 2,990~3,010Hz
Tape speed fluctuation : within 2,990~3,010Hz
WOW (WRMS) : 0.047% or less
MPX Filter Check
Condition:
DOLBY NR switch : OFF
MPX FILTER switch : OFF
Procedure:
1. Mode : stop
AF OSC
9 Attenuator
eeeeneee |
fo)
LINE OUT
LINE IN
315Hz, 0.25V (—10dB)
2. Applying 315Hz, 0.25V (—10dB) signal, adjust the REC LEVEL
and BALANCE controls so that the LINE OUT level is 0.32V
(—7.7dB).
3. Applying 19kHz, 0.25V (—10dB) signal, measure the LINE OUT
level.
Specification:
DOLBY NR switch: Either B, C or S
MPX FILTER switch: ON, LINE OUT level must be,
315Hz: within 0.28~0.36V (within —8.7~—6.7dB)
19kHz: 9.8mV (—38dB) or less

Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode : FWD playback
Test tape
P-4-A100 VTVM
(10kHz, —10dB)
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 1dB.
L-CH
peak
within
10B
R-CH
Screw Peak
we ——~ angle
position
L-CH peak R-CH peak
3. Phase Check
Mode: playback
Test tape
P-4-A100
(10kHz, —10dB)
ill
ae 47kO Oscilloscope
LINE OUT
4. Confirm that the phase difference between L-CH and R-CH is
in-phase to 90°.
Oscilloscope Lissajous’ Figures
QOOAOQOO
eT
good no good
in-phase 45° go° 135° = 180°
— J
Adjustment Location:
Adjusting screw
Playback Level Adjustment
Procedure:
1. Mode: playback
Test tape
P-4-L300
(315Hz, OdB)
LINE OUT
2. Adjust the RV101 (L-CH) and RV201 (R-CH) to satisfy the
following specification.
Adjustment Value:
LINE OUT level : 302 — 338mV
(-—8.2 — —7.2dB)
Level difference between channels: within 0.5dB
Confirm that the LINE OUT level does not change when playback and
stop are repeated.
Erase Current Adjustment
Procedure:
1. Mode: record
Blank tape
F
VTVM
TP503
requency
counter
CS-413
2. Adjust RV506 so that VTVM reading is 110mV (erase current
110mA).
3. At this time, confirm oscillation frequency.
Adjustment Value:
Erase current: 11072mA
Oscillation frequency: 160+6kHz

Blas Consumption Current Adjustment
Note: The bias consumption current must be adjusted before adjusting
the record bias. Retry record bias adjustment after the bias
consumption current is adjusted.
Procedure:
1,
Set semi-fixed resistors RV104 (L-CH), RV204 (R-CH) and RV505
for record bias adjustment to mechanical center, and select the
recording mode without applying a signal.
Adjust T101 (L-CH) and T201 (R-CH) so that the digital voltmeter
reading becomes minimum.
Digital
voltmeter
B+ (+8.5V)
Specification: 120mV or less
(This value is measured using CS-413 after bias adjustment.)
Blas and Recording level adjustment
Condition:
REC LEVEL control: Specified recording position (Page 9)
Procedure:
1.
2.
Mode: simultaneous record and playback
LINE IN
315Hz, 25mV (—30dB)
AF 7
10kHz, 25mV (—30dB) Blank tape
10kQ CS-222
Ay Bass Le
Oscilloscope VTVM J
[eo}}
{C4
LINE OUT
Adjust the following controls so that the minimum output becomes
the specified output level.
(1) RV104 (L-CH) and RV204 (R-CH) srrrrsreres Bias adjustment
(2) RV103 (L-CH) and RV203 (R-CH) serrrtssees Recording level
adjustment
Adjustment Value:
(1) Level of 10kHz against 315Hz: 0+0.3dB
(2) 315Hz level: 30.9 — 33.1mV (—28.0 — —27.4dB)
Metal Bias Adjustnemnt
Condition:
REC LEVEL control: Specified recording position (page 9)
Procedure:
1, Mode: simultaneous record and playback
315Hz, 25mV (—30dB)
Pelee
10kHz,
25mV
(--30dB)
Blank
tape
€)
oKQ.
LINE
IN
CS-413
(e)
Attenuator
ey
Looo*
LINE OUT
2. Adjust RVSO5 so that 10kHz R-CH output is 0+0.3dB relative to
the 315Hz output.
Calibration Adjustment and Level Meter Adjustment
Condition:
CALIBRATION switch: ON
Procedure (oscillation output level adjustment):
1, Mode: record (No signal to LINE IN)
VIM Blank tape
[A TP501 CS-222
2, Adjust RV508 so that the 400Hz check point level is 2.32 —2.59V
(9.5dB—10.5dB).
3. Adjust RV507 so that the 8kHz check point level is 2.32 — 2.59V
(9.5dB—10.5dB).
Procedure (level meter adjustment):
1. Record mode (No signal to LINE IN)
2. Adjust RV102 to higher side, then lower it gradually.
Adjsut so that the level “‘a” higher by one point than 0dB of LOW
FREQ segment (lower) of CAL level meter turns off.
3. Adjust RV202 so that HIGH FREQ segment (upper) up to 0dB
position of CAL level meter turns on.
HIGH: Blinking of level “a” higher by 1 point is acceptable.
HIGH
REC CAL FREQ L oem mem wae ee ee
LOW Bo ew ee eee oe ee oe
FREQ ‘
REC EO CAL NOP
“gy!
LOW: Blinking of level “a” higher by 1 point is not acceptable.

AUDIO (A) BOARD (component side)
Test point
(ERASE CURRENT)
ERASE CURRENT
RV203
RECORDING CALIBRATION
ce yet Adjustment
Test
point
Adjustment
(BIAS CONSUMPTION T201 2 |
Bk
BIAS
CONSUMPTION
SS
a
RV508
4)
BIAS Adjustment CURRENT Adjustment : | 3
Test point
(CALIBRATION TP501
OSCILLATION
LEVEL)
METAL BIAS RV103
Adjustment
PLAYBACK LEVEL RV202
Adjustment
CALIBRATION
42 22 METER
C502 Adjustment RV102
| 2l
SYSTEM CONTROL (A) BOARD (component side)
Test point
(ROTATION DETECTION)
oo 0]3
|
ic802 IC803 TP8O1
33
~P
FWD TORQUE Adjustment 64
Ic801
RV507

SECTION 5
DIAGRAMS
IC PIN ASSIGNMENT
1C801 Master Microcomputer (M50964-226SP)
This IC controls, based on input signals from various switches and remote devices, the mechanical deck, audio signal switching for equalizer, muting,
etc. and data transfer to the display microcomputer.
Function
Power supply (+5V)
Power supply (GND)
Reference voltage input (+ 5V) to A/D ports
Data output (analog) to display microcomputer (IC601)
lot used
wioi<|>l<
3/5/8)2 8
>
w)
2
ata Output to display microcomputer (IC601)
Not used (Connected to GND)
Not used (Connected to GND)
Not used (Connected to GND)
Key switch input (analog) OV: “4\”,1V: “J”, 2V: “0”, 3V: “ee”, 4V:“@”
“ “ . & ”
ac) >
ic
n
les)
o
ry
> =e
Key switch input (analog) OV: “p” ,1V:
Key switch input (analog) OV:“ RESET”, 1V:‘“‘MEMORY”, 2V :‘ DISPLAY MODE”
Key switch input (analog) 3V:“ REC”, 4V:“PLAY”, 5V:“ OFF”
echanism deck take-up reel table sensor pulse input
_
13
14
Z|
lechanism deck supply reel table sensor pulse input
A|
PEE EF lel el L 8
Zz
egative pulse input at counter 0
ot used
ot used (Connected to GND)
ot used (Connected to GND)
ot used (Connected to GND)
ot used (Pull up)
~
19
20
S-CLOCK
al aleletale ele
ia)
g sis|s/a1> a
Sl|nAln
3 o[m me
Z
R
Zz
N
< 7.)
n
Q
30
31
3
33~36
lock output (4MHz)
‘ot used
[sin
22 I SIRCS signal (remote control) normal phase input
23 SIRCS signal (remote control) inverted phase input Inverted SIRCS-L input
24 Not used (Open)
a
ec
ene
7 cata | eee ee
Pasar resp
29 Clock input (4MHz)
Poot
Power supply (GND)
Rotary encoder input for mechanism deck head base position detection
> fa w
5 |
fon)
37
38
Mechanism deck OPEN SW (S1004) input “LL” : Cassette holder is opened
| 1 | Mechanism deck CLOSE SW ($1003) input“ L” : Cassette holder is closed
OPEN SW
CLOSE SW
et ee
:
;
:
g
;
4

a) =
z 9
;
e) n =
Pin Name VO
DOOR SW
Mechanism
deck
DOOR
SW
(S1002)
input
“L”
:
Cassette
holder
status
changes
from
open
to
close
Mechanism
deck
REC
SW
(S1001)
input“
L”
:
REC
protector
is
broken
Mechanism
deck
70
~
SW
(S1008)
input
“H”:704S,
“tL”:
120,
S
(constant
when
playback
EQ)
Mechanism
deck
HALF
SW
(S1006)
input
“L”
:
Tape
is
loaded
Mechanism
deck
METAL
SW
(S1007)
input
“H”:Metaltape,
“LL”:
Normal
or
CrO2
tape
Mechanism deck head base UP output
Mechanism deck head base DOWN output
FSW
BEER
is <
<
Qa
z
:
CAM DOWN
&
47 M-FWD
48 M-RE
<
REV/
a
wav
[1
|
|.
[>|
“L” when reel motor runs at PLAY speed
“L” when reel motor runs at FF/REW speed
Bias oscillation control output “LL”: Oscillation, ‘“H”: OFF
|
i
> re
W o
= bes | >
“a
pe
e\8/8 4 =
wa N
REC mute control output “H” : Mute
Monitor switch output “H”: TAPE, “L”:SOURCE
Line mute control output “1H” : Mute
AMS switch output “L”: AMS
REC equalizer switching output “L” : Normal tape
53
54
NM Ww
WA
AMS MODE
58
59
REC equalizer switching output “L” : CrO2 tape
REC equalizer switching output“ L” : Metal tape
PATS EsIE tf ay}a SPREE ~ | I Zi] BS | <I 5
Z
AMS signal input “L”:Nomusic “H”: Music
61
62
63

1C601 Display Microcomputer (M50940-313SP)
This IC controls display of 24-segment level meter, counter, etc. based on the instruction from master microcomputer (IC801).
PinNane | 10
Level meter Rch input (analog) from meter amplifier (IC507)
FL tube grid output
Negative pulse output when counter is 00
PLAY LED output “L” : ON
PLAY LED output “L”:ON
PAUSE LED output “L”: ON
REC LED output “L”:ON
FL tube segment output (L : TAPE, H: SOURCE display)
FL tube segment output (‘‘ OVER LEVEL ” display)
ol
re o ais
na
a
5 S
=|
d
5~6
LEVEL L
10~15
6
7
as Q]| OQ
els
&
i
Q
2 Y
=
. ne
_ >
<
ac) >
Gq
a res]
8 Bs
a
21
22
FL tube segment output (“‘ TYPE I” display)
FL tube segment output (“ TYPE Il” display)
FL tube segment output (“ TYPE IV ” display)
Power supply (GND)
RESET input
Clock input (4MHz)
Clock output (4MHz)
Not used (Normally “L”)
| 0 |
| o |
a
| o |
Ee!
ea
nal
za
| o |
[eee
ne
Lee
oa
a
ae
ze
ie
==
| o |
Ea
ee
25 TYPE IV
26
ps
Q}4l)allalol| a Z
iil, |
5 <
S et
Pas
&
ies] 3
IN
29
30
31
|x 1
612le G@l4ig
4
w is)
<
an n
Power supply (GND)
Version switching input (Normally “ L ”)
w w
8
z g
i
a
5
4
TEST mode input ‘“‘L” : Meter all ON
Calibration SW (S602) input “L”: CAL mode, ‘“H”: Normal mode
36
37
3
39~62
Zz
$23~S0
<

5-1. SEMICONDUCTOR LEAD LAYOUTS
BA6219B M5218AL 2SB1094-LK
LB1641 2SD1406-YGR
2SD1585-LK
2$D2012
LS)
AS |
i Me SES By ib 12345678 ay
MARKING SIDE VIEW Hi
CXA14170 2SA1175-HFE 8 AN
2SC1815-Y
2SC2603-EF
2SD2144S-UVW
DTA114ES
DTA144ES
DTC114ES
DTC144ES
(TOP VIEW)
GP2S22B 2SA1409-LK
2SB1116A-L
2SC945-P
. c
8
Ece
5-2. CIRCUIT BOARDS LOCATION
SYSTEM CONTROL (A) board
SYSTEM CONTROL (D) board
SYSTEM CONTROL
(B) board CAPSTAN board
SYSTEM CONTROL
(E) board
MD board
{C) board
AUDIO (B) board
2SK246-GR SEL2210S-D
2SK30A-GR2 SEL2410E-D
SEL2910A-D
l long short
Sig D
10E2N anode cathode
1N4148M
30DF2
cathode
anode
HZS6C3L
UZL-12H1
UZL-6L3
cathode
anode
DOLBY S board
AUDIO (E) board
AUDIO
(D)
board
AUDIO
{(C)
board

5-3. BLOCK DIAGRAM HRPSOL
OX (5) eB €0 DOLBY AMP — 5502
(6)
a
©
LINE
OUT
ata
CALIN
REC/PB
OFF/B/C
LINE MUTE
Q107 ia
BUFFER
(5) (C506 ®
@ruter C)
J501
SWITCH
Q104
HEAD
PHONES.
RVIOL
0505
LINE MUTE
813,814
INPUT SWITCH
0514
RESET
Q801,802
$1001-S100S
SWITCH
0106
RvIO2
MD SWITCH
Rch
PB SIGNAL
CAL
METER
0512
0504
KEY
$603-612,851
SWITCH
Qo
DOLBY S|SWITCH
NORMAL 0520
RVSOI | NORMAL. SWITCH
3502 [BALANCE] LOIRECT
CINE
IN
REC
AMP
CrO2
SWITCH
1C513 9807
METAL SWITCH
REC 0806
RV502 RV503 MUTE
REG oul REMOTE CONTROL RECEIVER
LEVEL eae
INVERTER
| votsy s [owitcn ; eS
0519 ti
HRP 501 | | j
| | | T REEL DET
~ C1002
| ; |
(REC HEAD)
I
CALIBRATOR a -
SWITCH Hl
CALIBRATE (PLAY) Ded!
0854 awe
(Pause) D692 <
5y —-—+>
R (REC)
£6
ERASE
|
D603
CURRENT SWITCH
0851 oS
|
HESOI
ERASE
X tee | Osc KEY
° 527,528 OFF S601, $602
(ERASE
HEAD)
eam
0852
Rca t#—_ ps2
RV851 = = > Fs
ee |
RV505
D853
R~-CH
—_y_
+ Loh. T 4 0520
aan
9524 0523 Qii4
feel
BY,
[MPx
FILTER]
ONS
‘ ON + OFF R-CH
Bi
REC EQ SELECT SWITCH
BIAS SELECT
SAME AS R-CH
—-17-
49=

RV80!
FWD TORQUE
PHONE
P R-CH
17
RESET ene
(28) RESET MPLAY @9)
— WEF 69)
$ 1001-51005 35
MD SWITCH 40 RMR (48)
RMF @?)
(64) LMUTE
= 63)
9
= 3) CAL
CMO @5)
KEY
$603-612,851
Bas MECHANISM
6!) BIAS CONTROL
(52) REC MUTE —-1C B01
v sw@)
CrOz
SWITCH
63
0
sw@)
0807
0
METAL
SWITCH
0806
9)
v
ssw(3)
REMOTE
CONTROL
RECEIVER
@2)
\C85!
4-6: 14-16 - 25-64
T REEL DET
1C1002
S REEL OET
(C1001
+e
0802
MOTOR CONTROL
0804
0803
MOTOR CONTROL
2805 ASSIST
MOTOR Mi002
DRIVE ASSIST
MOTOR
C803
@9)
INVERTER C |
9803 (23) SIRCS £ XOUT G0)
Oo, $1007
(METAL }
$1008
(70p}
$1006
o
Ba (HALF )
PLAY
> 4
OFF
‘
S613 REC
FG
FG
CAPSTAN COIL
SERVO
X'tal
4.9406MH2
X95i
CAPSTAN
MOTOR
colt
i
Lim H90i -903
HALL ELEMENT
DISPLAY
SWITCH
0601-606
DISPLAY SWITCH
8Vv
BV REG
501,505
CONTROL
503,507
-8V REG
502,506
CONTROL
504,508
0701-704
-9V +
T901
POWER
TRANSFORMER
5001
POWER
33), > g B o™~o- Cf ac in
D715
D709
+5V REG
HONS 701,704 t¢
O71
ene +I2v REG ons
0703, 707 1
0705-708
9.2V REG
192 702,705
CONTROL
Q706
0712
NORMAL
Q607
Cr02
2608
(7) Croe
FLUORESCENT
(6) METAL LIGHT
METAL
Q609
INDICATOR
(16) TAPE
TUBE
(15) SOURCE
FLT6OI
$853
CALIBRATION
62 TAPE
(PLAY) 060 a 0610
(yi) SOURCE
>
(PAUSE) — D6O2 A ©) 1® 612,613
5vV + (15) 0 OVER LEVEL
(REC) D6Q3 “x 1@) O61!
20) @
o WV
~
@5)
CALIBRATION
DISPLAY 0858
TAPE QI)
2601 ;S602 CAL OVER LeveL 22 —~ 9852
p82!
(36)
CALIBRATION
+¢ SWITCH
—' 0607 0614
D520 erie
+
—~—wranannsntnadl
—22V
+8V
OFF-ON
TC-K808ES

|
TC-K909ES
« Semiconductor Location
ri i
J-7
os [rn i
Note:
@ o—-: parts extracted from the component side.
e @s parts mounted on the conductor side.
e @ =: Through hole.
= : : Pattern from the side which enables seeing.
(The other layers’patterns are not indicated.)
Caution:
Pattern face side: Parts on the pattern face side seen from
(Conductor Side) the pattern face are indicated.
Parts face side: | Parts on the parts face side seen from the
(Component Side) parts face are indicated.
5-4. PRINTED WIRING BOARDS —AUDIO Section—
* See page 16 for Circuit Boa
[AUDIO (D) BOARD)
Feat tow
NORMAL
HIGH
RV501
RVS02
(Rec fever] LEVEL
ee 2 ce ae ee 6 fi
[AUDIO (A) BOARD]
TO
SYSTEM CONTROL (B)
BOARD
OA 603
(See page 35)
|-646-409-
|
[AUDIO
(C)
BOARD]
3501 (CHASSIS)
(HEADPHONES)

on— * See page 16 for Circuit Boards Location and Semiconductor Lead Layouts. * See page 37 for Dolby S Board Schematic Diagram.
ee ae a (ee ieee: 9 10 Ne Se ei ee re es 9 20 2
(AUDIO
(A)
BOARD)
[DOLBY
S
BOARD]
(A
SIDE)
{DOLBY S BOARD) (B SIDE)
TO
SYSTEM CONTROL (B)
BOARD
0A 603
(See page 35)
TO
SYSTEM CONTROL (A)
BOARD
0A 804
(See page 33)
TO SYSTEM CONTROL (A) BOARD
SCN 703
(See page 34)
1-646 -409-
REC / PB HEAD
TO SYSTEM CONTROL (C) BOARD
DA852
HESOI
(See page 34) ERASE HEAD @REDY WHT
U
S |
YS «WHT WHT
HASSIS)
WHT]
|PNK
ia
«BLU»
<3 —
225.2
—24—