Sony TC-K555ES User manual

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77
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SPECIFICATIONS
TCM-110C3
- Continued on page 2 -
0.04 % WRMS (NAB)
±0.12 % (D IN)
SERVICE MANUAL
Tape Transport
Mechanism Type
Wow and fl utter
ChOFF B-TYPE ON C-TYPE ON
TYPE IV (Sony METALLIC) 60
dB 67 dB 73 dB
TYPE III (Sony FeCr) 62 dB 69 dB 75 dB
TYPE II (Sony UCX)
59 dB 66 dB
72 dB
TYPE I(Sony BH F)
56 dB
63 dB 69 dB
Recording system 4-track 2-channel stereo
Fast-forward and rewind time
Approx. 90 sec. (with C-60 cassette)
Bias frequency 105 kHz
Signal-to-noise ratio (NAB, at peak level)
Total harmonic distortion
0.8 % (with Sony METALLIC and FeCr
cassettes)
Frequency response DOLBY NR OFF
• With TYPE IV cassette (Sony METALLIC)
20 -19,000 Hz
25 -18,000 Hz (±3 dB)
25 -14,000 Hz (±3 dB, °
VU recording)
25 -19,000 Hz (DIN)
•
With TYPE" I cassette (Sony FeCr)
20 -19,000 Hz
25 -18,000 Hz
(±3 dB)
25 -19,000 Hz (DIN)
•
With TYPE" cassette (Sony UCX)
20 -18,000 Hz
25 -17,000 Hz
(±3 dB)
25 -17,000 Hz (DIN)
•
With TYPE I cassette (Sony BH F)
20 -18,000 Hz
25 -17,000 Hz (DIN)
•••••
•••••
•••
MICROFILM

TC-K555ES
I OdB=O.775V I
Peak program meters
Response range -40 dB to +8dB
Frequency response 20 -20,000 Hz zl.5 dB
Response
time 1 millisecond
Decay time (from 0 dB to -20 dB)
750
milliseconds
Overshoot none
r-
------ --
Inputs Line inputs (phono jacks)
Sensitivity 77.5 mV (-20 dB)
Input impedance 50 k ohms
Outputs Line outputs (phono jacks)
Output level 0.435 V (-5 dB) at aload
impedance of 50 k ohms
Load impedance over 10 k ohms
Headphone output
Output level, variable from -20 dB to
-50 dB at a load impedance of 8 ohms
General
Power
requirements AEP model: 220 Vac, 50/60 Hz
(240V ac adjustable by authorized
Sony personnel)
UK model: 240V ac, 50/60 Hz
(220 Vac adjustable by authorized
Sony personnel)
US, Canadian
model: 120 Vac, 60 Hz
E model: 110, 120,220 or 240 Vac ad-
justable, 50/60 Hz
FEATURES
Power consumption
Dimensions
Weight
26 watts
Approx. 430 x105 x285 mm (w/h/d)
(17 x4'/. x11'/. inches)
inclUding
projecting parts and controls
Approx. 6.1 kg (13 Ibs 80z)
Three-head system
Separate record and playback heads allow optimum gap settings
and impedance ratings for distortion-free recording and greatly ex-
tended frequency response. For good tape·to-head contact the
heads are mounted in one block and each head is separately ad-
justed for precise azimuth alignment. The three-head system also
enables you to monitor the recorded tape while actually recording.
Newly-developed LA
(LaserAmorphous) head
The record/playback head is made of a special amorphous
magnetic alloy developed by Sony, and its cores are solidly welded
by laser. This new
highly-durable head provides a wider dynamic
range and a more extended frequency response, especially in the
high-frequency range. The head is designed to take full advantage
of the potential of the metal tapes.
Closed-loop dual-capstan tape drive system
Two pairs of capstans and pinch rollers ensure uniform tape ten-
sion and stable tape-to-head contact. As aresult, wow and flutter
and modulation noise are greatly reduced.
Dolby C-type NR (noise reduction) system
In addition to the conventional B-type Dolby NR system, this
cassette deck employs the newly-developed C-type Dolby NR
system which reduces tape noise twice as effectively as the B-type
system. The C-type
system also incorporates an anti-saturation
network to improve the high-frequency dynamic range by 4 dB at
10 kHz.
Digital linear counter
This counter indicates the recording or playback time elapsed on
the tape so
that the tape can be precisely indexed. While conven-
tional displays can only indicate the elapsed recording time, this
display can indicate with a minus sign how much recording time re-
mains.
Bright FL-display peak program meters
The peak program meters follow the transient peaks of the music
and maintain the peak readings for about 4seconds. This double
indication makes it easy to set critical recording levels precisely.
Remote
control operation
Using the optional RM-50 or RM-80 remote control unit, various
operations-recording, playback, record muting operation, etc.-
can be remotely controlled.
When the RM-65 synchro remote control unit is used to connect
this cassette deck with a turntable equipped with a synchro remote
control jack, the operation of the cassette deck and the turntable
will be synchronized.
Two
motors
The two-motor drive system assures accurate and stable tape
transport. The capstan is driven by alinear torque BSL (brush/ess
and
slot less) motor to keep wow and flutter low and to provide
smooth torque.
Useful
functions
.Record muting function allows you to easily insert a moderately
long blank space between selections.
.Auto play permits one step rewind and playback from the begin-
ning
of the tape and the memory function allows you to easily
locate any desired point on the tape.
.A timer switch is provided to turn the deck on and off any number
of times at preset times set on an optional timer.
-2-

SAFETY CHECK-OUT (US Model)
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
TC-K555ES
3. Measuring the voltage drop across aresistor by
means
of aYOM 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 apassive YOM that
is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are
suitable. (See Fig. A)
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 0.5 rnA (500 microampers). Leakage
current can be measured by anyone of three
methods.
I. 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.
To Exposed Metal
Parts
on Set
1.5kH
..L Earth Ground
AC
voltmeter
(0.75 V)
MODEL IDENTIFICATION
- Specification Label -
SON~ MODEL NO. TC-K555ES
TAPECORDER
SERIAL NO.
MADE IN JAPAN
US, Canadian model: AC 120 V60 Hz 26 W
Fig. A. Using an AC voltmeter to check AC leakage.
SON~ MODEL NO. TC-K555ES
TAPECORDER
SERIAL NO.
MADE IN JAPAN
AEP model: AC 220 V~50/60 Hz 26 W
UK model: AC 240 V ~ 50/60 Hz 26 W
Emodel: AC 110, 120, 220, 240 V
~ 50/60 Hz 26 W
-3-

f~-K555ES I,L
Caution on DOLBY IC (CX174) Replacement
This set uses eight Dolby ICs (CXI74). (lCIOI,
102,201,202,301,302,401,402)
These ICs are either CX 174-1 or CX-174-3.
When replacing these ICs, be sure
to use the same
ICs as
the original one.
SONY
174 -
1 :CX174·1
3 :CX174-3
-4-

*
1-1. BLOCK DIAGRAMS
- Amp Section -
- L-CH--
PB EO AMP
IC501
SECTION 1
OUTLINE
TC-K555ES
5505-1 5506-2
I DOLBY NR 11Kl-----.I--+-~--+--___......___<:::I1 I DOLBY NRI
OFF B TYPE
• +
ON C TYPE
B+
(9.6Vl
TC-KS
TO 5Y5TEM CONTROL
BOARD
CNJ301
I L1Ni INI
-- R-CH-
• SAME AS L-CH
5507-1
I MPX FILTERI
OFF
+
ON
1Jc:}------~ SWITCHIREC EO) t------1I---------+__---_+----+----
0314
5506-1 5505-2
IDOLBY NRI IDOLBY NR!
1J<}---+-"-+-~"""-----1t>f1 OFF t OFF 5504-2
: j::: O~ TO MmR ....... t---_-+--~I O*N TJlT~['
BOARD(Al@_,--t-----+--i>°FF5503-2
_ * TYPE ill
ON Fe-Cr
-5-

.I
TC-K555ES I
S508-3
I MONITOR I
TAPE
+
SOURCE
HEADPHONE AMP ~AA CNJ501
IC503 r-~'" Ir IHEADPHONESI
R-CH
}
TO SYSTEM CONTROL BOARD
~~ .. @
TO METER BOARD(A)
IC801
CNJ302
I L1NE
L
OUT I
RV302
METER LEVEL
L
~... ~@
6) ,
R-CH
SWITCHING
Q514,515
S508-1
IMONITORI
TAPE
,
SOURCE
y L~G31~MP ~.+
+
R-CH
METER BOARD (A)
ICBOI
OFF
t
ON
TO SYSTEM CONTROL BOARD
8+ --1 VOL .. REG. H VOL.REG. ~~
(9.6VlQ 502 - 504 Q50I ~~
B-
(-9.6Vl
PL501 PL502
B- (9.6V)
B+
TO SYSTEM CONTROL BOARD
RV502~1
IBIAsl
t~
¥v3T~M CONTROL
BOARD
... 4-1
~~~~I
~
I
S504-2
,
,TYPE N
'"'\
METAL
S503-2
t
ITYPE ill
~\
Fe-Cr
-6-

TC-K555ES
-System Control Section -
SWITCH
-PM2~
~' .~ ~
TO RECORD BOARD
5802
ACCIDENTAL
ON ERASURE
t PREVENTION
OFF
0638
580 I
r----+-+---f-----t--+--+-~-+__t____1--~ CASSETE HALF OET
ON
t
OFF
~
~F
A
TO
RECORD
BOARD
@
0701
•
0702
~
0703
II
IC601
@I-----t
TO SYSTEM
CONTROL BOARD
~
I
FI
I
-7-
I

i55ES
TC-K555ES
TO RECORD BOARD
l~~
e
@
4)
~~
,-----o~ AC IN
DOLBY C INDICATOR
0607,609
DOLBY B INDICATOR
0608,610
) • ~} TO RECORD BOARD
1,2
AC 5.2V
r-----"------,
t
B+ B+
(6V) (22VI
- B+ (6V)
FLUORESCENT DISPLAY TUBE
B-t
B+ B+
(26VI (22VI
(~0) ,@ "TO SERVO BOARD I I
B+ 'i
(26V)
PLI
SPEED-DET ~~
0905,906 ~
B-
(-203VI'
TO PLAYBACK BOARD
~. • (POWER RESET)
5708
IRESETI
S709
[MEMORYI
0611 '4 ~ 1 TO RECORD BOARD
1I
SWITCH I . 4.T~ f
LJL-~----________=_~----- ~~~, ~
B+
(15V)
0612,613
~~MI
~ -----.r REEL MOTOR
~ r\7I PM2
~AMSSOLENOID
~~"\
PMI
~ HEAD SOLENOID
;~G
-.~ ~
,=-
-------------iIJl 'Xl •I
IC604 (1/2)
-8-

TC-K555ES
1-2. FUNCTION OF CONTROLS
The numbers in the photo are keyed to the following explanations.
TC-K5
COUNTER MEMORY button
TAPE select buttons and BIAS control e
Cassette holder
TIMER switch •
REMOTE
control connector
oPeak program meters
oDOLBY NR switches
oMPX FILTER switch
8 MONITOR switch and indicator
REC LEVEL (recording level) controls
• HEADPHONES level control
• Function buttons
OPOWER switch
Depress this switch to turn on the power. The lamp in the cassette
holder, the display of the peak program meter and the tape counter
will light up. The indicator lamp of the pause button will blink for
about 4seconds, indicating that the function buttons are in-
operative during this period.
Press
this switch again to turn the power off.
• ~ (eject) button
Press this button to open the cassette holder.
eTAPE select buttons and BIAS control
Depress one of the TAPE select buttons according to the type of
tape to be used. When the appropriate button is depressed, the op-
timum equalization and bias current settings are obtained for
recording, and the optimum equalization setting is obtained for
playback. When recording using aTYPE I(NORM), TYPE II (Cr0
2)or
TYPE III (Fe-Cr) tape,
adjust the BIAS control. See "Recommended
settings for the TAPE select buttons and the BIAS control': on page
11.
.Peak program meters
With the MONITOR switch set to SOURCE, the meters show the
peak input level of each channel, and to TAPE, the meters show
recorded levels. They follow the transient peaks of high-level inputs
that are too brief to be followed by conventional VU meters so that
the optimum recording level can be accurately set. The highest in-
put of each channel is held about 4 seconds on the scale, except
when a higher peak occurs before 4 seconds have passed, in which
case that peak is immediately indicated.
-9-
GOOLBY NR switches
The left switch turns the Dolby NR *(Noise Reduction) system on
and
off and the right switch selects either the B-type or C-type
Dolby NR system.
To record
with the Dolby NR process, depress the ON/OFF switch
to the ON position and choose B-TYPE (n )or C-TYPE (.D. ).
To record without the Dolby NR process, press the ON/OFF switch
again to release.
When
playing back, set these switches to the same position used
in recording.
* "Dolby" and the double-D symbol are trade marks of the Dolby Laboratories
Licensing Corporation. Noise reduction system manufactured under license
from Dolby Laboratories Licensing Corporation.
OMPX FILTER switch
Normally set this switch to OFF.
When recording FM stereo
broadcasts with the Dolby NR system,
set it
to ON if the 19 kHz pilot signal and the 38 kHz subcarrier have
not been adequately suppressed by the FM tuner or receiver.
If the tuner or the receiver suppresses such signals adequately
(most high-quality tuners and receivers will), you do not have to set
this switch to ON.
•MONITOR switch and indicator
When adjusting the recording level, set this switch to the released
position (SOURCE n) to allow monitoring of the sound to be
recorded. During
playback, depress this switch (TAPE 0.) to allow
monitoring of the recorded sound. According to the MONITOR
switch setting, "SOURCE" or "TAPE" will appear in the indicator
window.
During recording, use this switch to monitor either the source or
the recorded sound.

TC-K555ES
OREC LEVEL (recording level) controls
These controls adjust the recording level. The knob nearest the
panel is for the left channel and the other knob for the right chan-
nel. To
adjust the level of the left or right channel only, turn the ap-
propriate knob while holding the other knob.
OTiMER switch
You can set the unit to record or play back at apredetermined time
by connecting any commercially available timer. To record, set this
timer switch to REC. To play back, set it to PLAY.
(!) REMOTE control connector
Connect the optional RM-50 (wired) or RM-80 (wireless) remote con-
trol
unit to operate the tape transport functions from a distance.
Synchronized operation is also possible with selected Sony turn-
tables, using
the optional RM-65 synchro remote control unit. Read
the
instruction manual of your remote control unit before operating
it.
CD Tape counter
This counter indicates the tape running time .
•COUNTER RESET button
Press this button to reset the tape counter to "0.00."
GCOUNTER MEMORY button
Press to rewind the tape to the "0.00" point on the tape counter.
The word
"MEMORY" is displayed below the tape counter. Press-
ing the
~ button together with the - button automatically starts
playback from "0.00."
When you do not use the memory function, press this button again.
The word
"MEMORY" will disappear.
4D Function buttons
It is possible to switch directly from one mode to another. The in-
dicator lamps light when the tape deck is in the forward, record or
pause mode.
-(rewind)
button: Press this button to rewind the tape. This
button is also used, with the ~ button, to initiate auto play.
•(stop)
button: To stop the tape, press this button. The tape will
stop automatically when it is completely wound in either direc-
tion.
~ (forward) button: Press this button to play the tape back. To
record, press
this button while holding the. button down.
-(fast-forward)
button: Press this button to advance the tape
rapidly.
•(record)
button: Press this button together with the ~ button to
start recording.
"(pause)
button: To pause for a moment during recording or
playback, press
this button. This button is also used to control
more precisely the start of recording and to release the record
muting mode.
o(record muting) button: Press this button to eliminate un-
wanted
material and to insert a blank space during recording.
G)HEADPHONES jack
Headphones may be inserted either to monitor the input signals to
be recorded or to listen to arecording in the playback mode.
Headphone volume is
adjustable with the HEADPHONES control.
oHEADPHONES level control
This control adjusts the headphone level. This selling does not af-
fect
the peak program meters or the output level of the LINE OUT
jacks at the rear.
"
-10-

TC-K555ES
'-3. RECORDING
RECOMMENDED SETTINGS FOR THE TAPE SELECT BUTTONS
AND BIAS CONTROL
Press
the appropriate TAPE select button referring to the recom-
mended
settings listed below. When recording using aTYPE I(nor-
mal), TYPE
II (CrO,) or TYPE III (Fe-Cr) tape, adjust the BIAS control
also.
While the settings are optimum for Sony cassettes, you may want
to change them when using cassettes produced by other manufac-
tures.
BIAS
control
This control regulates bias current for TYPE I (NORM), TYPE II
(CrO,) and TYPE III (Fe-Cr) cassettes. The full counterclockwise
position decreases bias by about 20% from the center position and
the full clockwise position increases it by about 20%. Generally, as
bias is increased, extreme high frequencies will be suppressed. As
bias is reduced, extreme high frequencies will be boosted. You can
then
find the appropriate bias setting for each brand of TYPE I,
TYPE II and TYPE III cassettes.
Tape list (for Canada)
Tapes (C-60 and C·9O)
Type 01 tape
SONY:
LNX, SHF
AMPEX:
GRAND MASTER I
MAXELL:
UD, UD·XL I,
FUJI: FX·I TYPE I
XL I·S
MEMOREX:
MRX·'
(NORMAL)
SCOTCH:
MASTER I TDK:
AD, AD·X
SONY: UCX·S, EHF
AMPEX:
GRAND MASTER II
FUJI: FX·II TYPE
II
MAXELL:
UD·XL II, XLlI·S MEMOREX:
HIGH BIAS II
(CrO,)
SCOTCH: MASTER II
TDK: SA, SA·X
SONY: FeCr
BASF: PROFESSIONAL III TYPE III
SCOTCH:
MASTER III (Fe·Cr)
TYPE I
SONY:
METALLIC
Other metal tapes
(METAL)
CD
"0
.~
Qi Bias reduced
~ 1---B-ia-s-I-'n-c-re-a-s-ed--ooE::----
"5
c.
"5
0'-- -::- __ --:-,-- _
Frequency in Hz
RECORD MONITORING
As
this tape deck has separate record and playback heads, you can
easily
compare the source and the recorded sounds in the record-
ing mode by using
the MONITOR switch. You can check the record·
ing level and
whether there is any contamination on the heads that
is affecting the recording.
.If the connected amplifier has atape monitor selector, sourcel
tape comparison is possible with the amplifier monitor selector. In
this case, set the tape deck MO ITOR switch to TAPE.
Tape
list (for other countries)
MONITOR switch setting and signal flow
REC LEVEL
l+---toJ LINE IN
l+---toJ LINE IN
REC LEVEL
Playback
head
J-J()~A~~~i~
~,,~ J;:==='h- .... --Q~ MONITOR
TAPE
TO RECORD MATERIAL ONTO ASPECIFIC PORTION OF TAPE
When you want
to re-record a specific portion of tape or to insert
new
material between two points on atape you will find it handy to
be able to change directly from the playback to the record mode by
pressing
the. REC button while holding the ~ button down.
The three-head
system permits you to monitor the recorded sound
while in the record mode, so that you can easily check the effects
of various settings of the TAPE select buttons and the BIAS con-
trol.
f
Tapes (C-60
and C·90)
Type of tape
SONY: AHF, BHF AGFA:
SUPER FERRO DYNAMIC
BASF: LH-X. Professional I FUJI: FX·I TYPE I
MAX ELL :UD, UD·XL I, XL I·S PHILIPS: SUPER FERRO·f (NORMAL)
SCOTCH: MASTER I TDK: AD
SONY: UCX·S, UCX
AGFA: STEREO CHROM
BASF: Professional II FUJI: FX·II TYPE
II
MAX ELL :UD·XLlI, XLlI·S PHILIPS: CHROMIUM (CrO,)
SCOTCH: MASTER II
TDK: SA, SA·X
SONY: Feer AGFA: CARAT
TYPE III
BASF: Professional III PHILIPS: FERRO CHROMIUM
SCOTCH: MASTER III (Fe·Cr)
TYPE IV
SONY: METALLIC
Other metal tapes
(METAL)
-11-

PM
1M
'M
HE
)
R
G
El
9
TC-K555ES
1-4. TO ADJUST THE RECORDING LEVEL
Adjust the recording level while monitoring on the peak program
meters the input level of the program source to be recorded. If the
recording level setting is too high, the recording will be distorted,
and if the setting is too low, the recording will be noisy. The record·
ing level
should be set as high as possible while still avoiding
distortion. This level will depend on the type of tape being used.
When the TAPE button is pressed, the range above the saturation
level of the selected type of tape is indicated by the red line.
Generally speaking, adjust the recording level by making sure that
the meters deflect only to the left end of the red line at the highest
signal level.
Example: Type I cassette
-- -40 -jO -}(j -10 0oJ .4., -8
c::;J~c:::.c::::J~CJc::::Jc::Jc::JOc:::J~
c:::::;):=Jc::::x:=Jc:::J~c:lc:::::Jc:=lc::=Jc::::1c::;J
/R~iCh
Saturation level of Type I cassette saturation occurs.
Since the saturation level of any tape is lower in the higher frequen·
cies than in the lower frequencies, the recording level may still be
too high if adjusted in this way if the program to be recorded con·
tains many high frequency signals. Consideration has to be given
to the program source to be recorded as well as to the character·
istics of the cassette to be used, since each cassette, even casset·
tes using the same type of tape, may have different characteristics.
The following table will provide you with a starting point in setting
the recording level of various kinds of programs when using Sony
cassettes.
Type of
Sony
Low and mid freq. Mid and high freq.
tape
cassettes
range programs range programs
(vocal, etc.) (piano,
guitar, etc.)
I
BHF
+3
dB +1 dB
AHF
+4 dB
+2
dB
II
UCX +
3dB
+2
dB
III FeCr +
5dB
+1
dB
IV
METALLIC
+ 6dB + 6dB
-12-

SECTION 2
DISASSEMBLY
Note: Follow the disa"ssembly procedure in the numerical order given.
TC-K555ES TC-KS
CASE
BWscrew
PLAYBACK BOARD
BOTTOM PLATE
case j
+BVTT3x6
r-----~ + BVTT3x8
bottom plate
-13-
BWscrew

5TC-KSSSES ·1
f)
rO+BVTT3X20
8 ~reverse board
/1~ ~" spacer
f)+PTTWH3x5 ~ --~ ~systemcontrolboard
SYSTEM CONTROL
BOARD
CASSETTE
LID/PANEL
f)+BVTT3x6- - ~
A- 8+ BVTT3x6
record board
-14-

ESCUTCHEON ASS'Y
~.
~
~ fush thed~wsmarkedby 0
~ with precision screwdriver.
TC-K555 5
MECHANISM SECTION
Of) + BVTT3x6
O+BVTT3x6
CASSETTE HOLDER
8 Remove\'he gu;de ~ '-- a~~~ ~
/;~ '/)
/d~'P cA'
;:-tJi' ~ Z ·
oRerr:ove the loading '- ~2- f) Remove the holder
spnng. ~ support.
@} Remove 'he gu;de rOller.· ~
OBVTT2.6x5
-15-

555ES
TC-K555ES
METER AMS SOLENOID
Remove the brake solenoid
holding it up.
When
installing:
~brake
F solenoid
brake
OBVTT3x5
~Si u~ I I
\K'<::JV A- 0Remove the
flywheel.
8" \" .~
Remove the belt. \ \ ..... ~J
RECORD/PLAYBACK HEAD 0 ~ f}
ERASE HEAD & ~ &
f) Remove the record
playback head.
-16-

.CASSETTE-ORNAMENT PLATE
Note: This plate does not need screws to be installed.
1. Press the ejection button and open the cassette
lid.
2. Release the two claws from the cassette-
ornament plate at
both the top corners.
3. Depress the REC detecting lever and the half
detecting levers at the inside
of the set and re-
move the cassette-ornament plate.
4. When reinstalling
the cassette-ornament plate,
perform the steps in areverse manner.
claw
cassette-ornamentplate
MECHANISM SECTION PHOTOGRAPHS
1. Top View with Cassete Holder Shut:
2.
Bottom View with Cassette Holder Shut:
-17-
TC-K555ES
3. Left Side View with Cassette Holder Shut:
4. Right Side View with Cassette Holder Shut:
5.
Front View with Cassette Holder Removed:
TC-K
6. F

ES TC-K555ES
6. Front View with Cassette Holder and Cassette-
Ornament Plate Removed: 8.
Bottom View with Thrust Retainer and DC
Motor Removed:
7. Rear View: 9. Bottom View with Switch Board and Flywheel
(T) Removed:
SELECT TUNE LEVER/BRAKE PLATE ASS'Y/
SWITCH BOARD
swith board
~~~~~
/ ~[II
~ ~~~8~" il 6:~
~~//'~ /~~;- 1{O~
~ ~ I ~~I,-- O/:'~ ~
~ ~1!: /
/'1 ~ ~ I~~ ~, ~:t/
,~01 60i ~~-/
~ ~I'I / ~/
",... .»';T •I 'I"" //~~.
~ ~ ~~
OPTPWH3xB ~ (Qjt:l~~\.fi;)'/ -~ / ~~
(1) PTP'AI ~*, ~ ~-- ~
.v'H 3xBV . . '\ .
,brake sele
~
•'-..... plate ass'y ct tune lever
0PTPWH3xB ~
~ote: Be sure to tighten the screws 0'-0in numerical
order given. Otherwise
motor position may be dis-
placed and decrease the performance.
Select tune lever: 0, f)
"Brake plate ass'y: 0 -., ()
Switch board: 0 -., 0
-18-

SECTION 3
ADJUSTMENTS
TC-K555ES
3-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with adenatured-
alcohol-moistened swab:
2. Demagnetize
the record/playback head with a
head demagnetizer.
3. Do
not use amagnetized screwdriver for the ad-
justments.
4. After the adjustments, apply suitable locking
compound to the parts adjusted.
5.
The adjustments should be performed with the
rated power supply voltage uhless otherwise
noted.
Torque Torque meter
Meter reading
FF
CQ-201B 65 -85
g-cm
REW
record/playback head
erase
head
capstan
FF/REW Torque Measurement
pinch roller
ru bber belts
idlers
tape FE
Tape Path Adjustment
1. Insert amirror cassette (CQ-009C).
2. Set
for forward mode and confirm that there is
no tape curl at the tape guides and recording
head.
3.
If there is curl, turn the adjust nut and raise and
lower
the supply side pinch roller (with tape
guide attached) to adjust.
4.
If step 3does not get rid of the curl, adjust
further by turning adjustment screws A, B, C
less
than 1/
2
turn in the same direction at the
same angle.
5. Confirm
that the erase head height is as shown
in Figure
2.
6. Check tape wrinkling (zigzag).
Tighten adjust screw D if the tape is wrinkling
up. (clockwise)
Loosen screw 0
if the tape is wrinkling down-
ward. (conterclockwise)
Repeat step 5 after adjusting screw D as neces-
sary, within
1/
2turn.
7. Lock
the screw with locking compound.
record/playback head
16.1 mm
tape guide
Fig. 3
capstan
pinch
roller
C8
D *When replacing the pinch roller, be sure that the measurements are
as shown below when attaching it. (After installation, perform
the above adjustment.)
1. Loosen screws E, Fso that
the ratio between a and b
is 3 : 5
and adjust with the
adjustment shim.
2. When changing erase head
heigh t, check for tape
wrinkling.
Fig. 1
~ II O.75mm
(b)
E F
Fig. 2
tape I
n~~~5mm
_________ • ---10,
II
I I
II
II
tape path adjustment
-19-

TC-K555ES
Head Base Position Adjustment
Perform the following adjustment when replacing the
head
base solenoid.
Perform with the old head base solenoid still in
place.
1. Press the head base solenoid core with the
finger until the head base stops moving.
2. Draw aline as shown in Figure 2. Replace with
the new head base solenoid.
3. Loosen
the mounting screw, match with the
line drawn in step 2, and tighten the screw.
4. Lock
the screw after adjustment.
L-_..-L~;---- draw aline
head board
~..--_,.--: .. ~- -"?
~ ...
, ,
,,
_...L __ .L_,
X:
I
I
I
I
I
I
XI
I
__ ..J
core
screws
head base solenoid Fig. 1
head board
Jz. mech chassis
Fig. 2
head base position adjustment
-20-