Sony TC-K333ESG User manual

TC-K333ESG
Dolby noise reduction manufactured under license from
Doiby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbot 0G are trademarks of
Dolby Laboratories Licensing Corporation.
SPECIFICATIONS
Recording system 4-track 2-channe! stereo General
Bias AC bias Power requirements
Heads Erase head x 1 (S&F head)
Recording head x 1 (LA head)
Playback head x 1 (LA head)
Motors Capstan motor x 1
(direct drive linear torque BSL motor)
Reel motor x 1 (DC motor)
Wow and flutter 0.024% WRMS (NAB)
Fast-forward and rewind time
Approx. 90 sec. (with C-60 cassette)
Frequency response (DOLBY NR OFF)
TYPE IV cassette 15-— 22,000 Hz (+3 dB, DIN)
(Sony METAL-ES) 15-—16,000 Hz (OVU recording) :
TYPE il cassette 15—20,000 Hz (+3 dB, DIN)
Sony UX-S)
TYPE | cassette 15-18,000 Hz (+3 dB, DIN)
(Sony HF-S) .
Signal-to-noise ratio (at peak level
)
Dolby NR switch OFF B-TYPE | C-TYPE
ON ON
TYPE IV (Sony METAL-ES) 70 dB | 76 dB
TYPE lI (Sony UX-S) 59 dB | 68dB | 74 4B
TYPE | (Sony HF-S) 57dB | 66dB | 72 dB
Total harmonic distortion
Inputs
0.8%
(with
Sony
METAL-ES
cassette)
Line inputs Sensitivity 77.5 mV (-—20 dB)
(phono jacks) Input impedance | 50k ohms
CD DIRECT INPUT | Input impedance 50k ohms
Outputs
Line outputs Rated output level | 0.44 V (—5 dB) ata
(phono jacks) load impedance
47k ohms
Load impedance Over 10k ohms
Headphones Output level 0-3 mW at a load
(stereo phone jack) impedance of 32
ohms
Power consumption
Dimensions
Weight
Model Name Using Similar Mechanism | New |
Tape Transport Mechanism Type TCM- 200D 1
US Model
Canadian Model
AEP Model
UK Model
TC-K950ES
E Model
TC-K333ESG
AEP model:
220 V AC, 50/60 Hz
UK model :
240 V AC, 50 Hz
US, Canadian models :
120 V AC, 60 Hz
E model :
120, 220, or 240 V AC adjustable,
50/60 Hz
31 W
Except UK model :
Approx. 470 x 140 x 380 mm (w/h/d)
(185, x 5, x 15 inches)
UK model :
Approx. 430 x 140 x 380
(17x 5, 15 inches)
including projecting parts and controls
Approx. 11.7 kg (25 ibs 13 02)
Model for the United Kingdom:
Approx. 11 kg (24 Ibs 5 02)
Supplied accessories Audio connecting cord (2)
Wireless remote control unit RM-J702 (1)
Sony R6 (size-AA) batteries (2)
Screws (8) (Except UK model)
A remote commander and Sony R6 batteries are supplied with
UK, E models.
Design and specifications subject to change without notice.
Note
This appliance conforms with EEC Directive 87/308/EEC
regarding interference suppression.
STEREO CASSETTE DECK
SONY.

TC-K333ESG/K950ES
TABLE OF CONTENTS
section Title Page
SPECIFICATIONS i a ee ee 1
MODEL IDENTIFICATION re ee ee 3
SAFETY CHECK-OUT cress ecssecccccercccescceceees 3
1. GENERAL +++ee errr rere cette eee e eter eeeeeeeeeennees 4
2. DISASSEMBLY rrr re ee ee 5
3. ADJUSTMENTS
3-1. Mechanical Adjustments -++sssssrrreee reer 7
3-2. Electrical Adjustments :+++++s+rerteeeer eres 10
4. DIAGRAMS
4-1-1. IC Block Diagrams+-++++seereseeeeeeeeees 15
4-2-1. IC503, 505 (CX20188) Pin Functions::::- 15
4-2-2. IC801 (M50964-220SP) Pin Functions --- 16
4-1-2. Ic Block Diagrams Corer reer verre sceseees 17
4-3, Block Diagram cecsrsrrtseee eect e er eeeeeeees 17
4-4, Semiconductor Lead Layouts -+++++++-+++*> 21
4-5. Circuit Boards Location -sr++ssssrrereeeees 21
4-6. Printed Wiring Boards
— Audio Section — cceerer reece eee eeeeeeees 22
4-7, Schematic Diagram |
— Audio Section — cerrrserercecetereeeeeees 27
4-8. Printed Wiring Boards
—Syscon Section — srrrrerscrereceseeeeeees 32
4-9. Schematic Diagram
— Syscon section rr ee 37
5. EXPLODED VIEWS
5-1. Panel Section -crrssercreee eset sere enc cree 42
5-2. Chassis Section «cssccesece reece eeeeeeceeees 44
5-8. Mechanism Section (1)
(TCM~200D1) srrerecercee eer eeceeeeeeeenees A5
5-4. Mechanism Section (2)
(TCM-200D1) srrrereereceecereeeeecseneeens 46
6. ELECTRICAL PARTS LIST --++csscrreeeeeeeeeeeee AT
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.
Flexible Circuit Board Repairing
* Keep the temperature of the soldering iron around
270 during repairing,
* Do not touch the soldering iron on the same conductor
of the circuit board (within 3 times).
* Be careful not to apply force on the conductor when
soldering or unsoldering.
Notes on chip component replacement
« Never reuse a disconnected chip component.
« Notice that the minus side of a tantalum capacitor may
be damaged by heat,
Dolby noise reduction and HX Pro headroom extension
manufactured under license from Dolby Laboratories
Licensing Corporation. HX Pro originated by Bang &
Olufsen.
Operating voltage .
Before connecting the unit to the power source, check
that the operational voltage of your unit is the same as
the local power supply.
Where purchased | Operating voltage
AEP, WG model | 220 V AC, 50/60 Hz
UK model 240 V AC, 50 Hz
US, 120 V AC, 60 Hz
Canadian model
E model
120, 220 or 240 V AC adjustable,
50/60 Hz
A voltage selector is located on the
rear panel. If the selector must be
reset, disconnect the AC power
cord and set the selector to the
appropriate voltage.
VOLTAGE selector
VOLTAGE
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.
—_2—

| TC-K333ESG/K950ES
MODEL IDENTIFICATION SAFETY CHECK-OUT
— Specification Label —
After correcting the original service problem,
perform the following safety check before releasing
TC- K333ESG the set to the customer:
TC- K950ES Check the antenna terminals, metal trim, ‘‘metallized”
knobs, screws, and all other exposed metal parts for
AC leakage. Check leakage as described below.
SONY: = wo. 1.G,@
STEREO CASSETTE DECK EEA eee
WML LLL
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 (500 microampers). Leakage
current can be measured by any one of three
SERIAL NO. methods: |
MADE IN JAPAN 1. A commercial leakage tester, such as the
Simpson 229 or RCA WT-S40A. Follow the
manufacturers’ instructions to use these instru-
US, Canadian Models: AC: 120V 60Hz 31W ments.
AEP, West Germany
Model: AC: 220V \50/60Hz 31W
nw
A battery-operated AC milliammeter. The Data
Precision 245 digital multimeter is suitable for
UK Model: AC: 240V “U50/60Hz 31W this job.
E
Model:
AC:
120,
220,
240V
;
:
T\)50/60Hz 31W . 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 suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are
suitable. (See Fig. A)
To Exposed Metal
Parts on Set
AC
voltmeter
| | «(0.78 V)
= Earth Ground
Using an AC voltmeter to check AC leakage.

TC-K333ESG/K950ES
SECTION 1
GENERAL
LOCATION AND FUNCTION OF CONTROLS
fteseiece
POWER switch
| 2|Remote sensor
You can remotely control this cassette deck with:
— A remote commander that has an mark and
comes with a Sony amplifier or receiver and which
can be used to control a cassette deck.
— An optional Sony remote commander that has an
mark.
/3|LINEAR COUNTER
|4|RESET button
MEMORY button
DISPLAY MODE button
|5 | Dolby HX PRO button
6 | DOLBY NR (noise reduction)/ MPX FILTER switch
MONITOR switch
[8 |INPUT switch
[9 |PEAK PROGRAM METER
REC (recording) LEVEL
PHONE (headphones)LEVEL control
Remote Commander
(> [>] [>] [IN]
& (open/close) button
for opening and closing the cassette holder
[2] DISPLAY button
for selecting the display mode
Counter buttons
RESET button
for resetting the counter to zero
MEMORY button
for activating and deactivating the Memory function
Ceara jack (stereo headphone jack)
REC EQ CAL (recording equalization calibration)
switch (LOW, NORMAL, HIGH)
19] Tape operation buttons and indicators
<4 (rewind) button
(gi (stop) button
> (play) button and indicator
bP (fast-forward) button
@ REC (record) button and indicator
il PAUSE button and indicator
O REC MUTE (record muting) button
20] AMS(Automatic Music Sensor) buttons
TIMER switch
[4] Tape operation buttons
<q /p | (AMS*) buttons
for locating selections sequentially
<< (leftward fast winding) button
pp (rightward fast winding) button
» (forward play) button
@ (record) button
@ (stop) button
II (pause) button
© (record muting) button
[s]cp (Compact Disc) buttons (for Sony CD players)
If (pause) button
Ke<q/bP1 (AMS) buttons
for locating selections sequentially
[6]CD SYNCHRO buttons
for synchronized recording with a Sony CD player (see
procedure below)
STOP (synchronized recording stop) button
START (synchronized recording start) button
STANDBY (synchronized recording standby) button
* AMS is an abbreviation for Automatic Music Sensor.
Procedure for Synchronized Recording with a CD Player

SECTION 2
DISASSEMBLY
NOTE: Follow the disassembly procedure in the numerical order given.
: JOINT LEVER 2
CASSETTE HOLDER © SPRING 4) x
@ CASSETTE
HOLDER
ORNAMENTAL PLATE
@ORNAMENTAL PLATE
SCREWS,
*
<(h
PINCH
LEVER//LEVER
FR/HEAD
+B
26x6
(2
pes)
@-— O: PINCH LEVER S
[1]. [2] : PINCH LEVER T
A\ A\: LEVER FR
ZA\ STOPPER WASHER 1.5
A\ LEVER FR
[2] PINCH LEVER T
N
O-— 1 stopper WASHER 2.3
@ LEVER PS
@ PINCH LEVER S

COMPARATOR BOARD//CAPSTAN BOARD//FLYWHEELS//FG BOARD
&
SCREWS,
+PS
3x6
(2
pes.)
A\.Z\
:
COMPARATOR
BAORD
é. @— @ : CAPSTAN BOARD
WASHER
(1]—[3] : FG BOARD (after removal of 1 and 2)
Note: To remove the whole unit assembled on CAPSTAN
DECK. (D1) ASSY, remove 4 screws marked x.
FLYWHEEL (S)
@ SCREWS,+ BVTT 3x5 (2 pes.)
i“ ape os 6 CAPSTAN BELT
Peet @CAPSTAN BOARD
@ THRUST RETAINER D BRACKET ASSY
@ SCREWS,+PS 3x6 (2 pcs.)
FG BOARD
[2] SCREW,+ PS 2.66
i a ZA COMPARATOR BOARD
MD BOARD “=o— /\ SCREWS, + BVTT 3x5 (2pcs.)
@ SCREWS, + BTP 2x 18 (3 pes.) @ SCREWS, + PS 3x6 (2 pes.)
a
: Ny
Ss Se oY Y]
ar */ Align A- mark to the line
Me when reassembling .
Align BOSS of MODE CAM to
the point when ressembling .
;
o i .
; i
i
@
MD
BOARD
a
iS
K
ROTARY
ENCODER
(81001)
/ SELECTION LEVER
SEL, @ SCREWS, + B2.6 x 6 (4 pes.)
7\--—— MODE CAM
Align the fine on MODE CAM to
the tip of SELECTION LEVER.
HOOK BELT here
temporarily when
reassembling.
REEL MOTOR BOARD
@ASSIST MOTOR (M1002)
Soldering
SPACER (MOTOR)
[\ ~ @REEL MOTOR (M1001)
Soldering
a
MD BOARD
@REEL MOTOR BAORD

3-
—
oN
SECTION 3
ADJUSTMENTS
1. MECHANICAL ADJUSTMENTS
PRECAUTION
. Clean the following parts with a denatured-
alcohol-moistened swab:
pinch roller
rubber belts
idlers
record/playback head
erase head
capstan
. Demagnetize the record/playback and erase head
with a head demagnetizer.
. Do not use a magnetized screwdriver for the
adjustments.
. After the adjustments, apply suitable locking
compound to the parts adjusted.
. The adjustments should be performed with the
rated power supply voltage unless otherwise
noted.
capstan
tape guide (S}
pinch roller (S)
pinch roller (T)
erase head REC/PB head
FLYWHEELS T/S THRUST ADJUSTMENT
1, FLYWHEEL T THRUST ADJUSTMENT :
Insert 3mm —thick spacer guage into the
clearance between magnet of FLYWHEEL T and
CAPSTAN Board, and adjust THRUST SCREW
so that thrust play is 0.2—0.4mm .
. FLYWHEELS THRUST ADJUSTMENT :
Tighten THRUST SCREW lightly until the
flywheel has no play and then loosen the screw
by 1/2-—3//4 turns.
. After adjustments, apply locking compounce to
the screws.
Pinch Roller 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: 270 — 350g (9.5 — 120z)
Supply side: 180 — 280g (6.4 — 9,902)
capstan
pinch roller
tension gauge
THRUST SCREW
CAPSTAN BOARD
THRUST SCREW
REAR VIEW OF MECHANISM

Tape
Path
Adjustment
1.
Insert
the
mirror
cassette
and
put
the
unit
in
¢
Refer
to
Adjustment
Position
on
page
10.
record/
playback
mode.
Note:
When
using
the
adjustment
methods
for
other
2.
Check
to
see whether
the
tape
is
curling
at
the
than replacement reasons, please do not record/ playback head guide or the pinch roller
tamper unnecessarily with the adjustment guide.
screws or the erasehead because either the
supply pinch roller guide or the record/
playback head will be made the standard tape
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
by one, completely taking out the first tape
path, and then replacing the second one.
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.
1. Insert the mirror cassette and put the unit in
Preparation :
1. Mirror cassette CQO09C 8-909-708-01
(or CQ012C 8-909-708-02)
If one does not have this, cut out the sections of
record/ playback mode.
2. (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
a 120-minute cassette shell as indicated below
and use that cassette.
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).
a inside 1i outside Re | ' ofl
Ven
YA
—
ial
as
ee
Rie
ae
ae:
2. Phillips screwdriver (medium-size) : | .
For the head adjustment screws normal Curling on the Curling on the
Blade-type screwdriver (large-size) :
For the supply pinch roller adjustment screws
3. Pen light
WS-48B (3 kHz, 0 dB)
5. P-4-A100 (10 kHz,-10 dB)
(record/ playback head inner side. outer side.
as seen from the side Tighten screws Loosen screws
of the erasehead.) ®, ©, and @. @, ©, and @.
>
3. (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.
Definition of Terms: The figures are of a record/
playback head.
Height Declination § Depth Azimuth
Adjustment Method : Pi eas She ests
z » Repeat the adjustments in steps 2 an and fine
S Pinch Roll
UpeY Een one { ; adjust the height and the declination.
Note: Only perform this adjustment when the supply
pinch roller is to be replaced.

5. (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.
6. (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-4-100S
(10 kHz, —10 a8) Oscilloscope
UNE CUT
Oscilloscope Resurge Waveform
OQ ®OO®PO®
In Phase 45° Jt SO, -$80°
Good "Baa
Erasehead
Note: Only perform this adjustment when the
erasehead is to be replaced.
1, Insert the mirror cassette and put the unit in
record/playback mode.
2. (Azimuth Adjustment) Adjust the azimuth of the
erasehead by adjusting screws @ and @ so that
the tape runs as evenly as possible.
SS
Normal Tighten @ Tighten @
Loosen @ Loosen @
(The erasehead as seen when erasing the mirror
cassette.)
4. (Declination Adjustment) Leaving
| TC-K333ESG/K950ES
3. (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.)
oe
Tape —»
et en J
Make these the same width.
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.
6. (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 a eae 5 mm
Normal sae ae +. | | a
ba playback
Not deep enough Too deep
1. Check to make sure that there are no curls or
shifts throughout the whole tape path and that
the tape runs smoothly.
z Reapply the locking compound to the adjusted
screws. (The locking compound should only be
applied to screw © after the azimuth has been
adjusted.)

TC-K333ESG/K950ES |
Adjustment Position: As seen from the cassette,
side (top) and MD as seen
head on (bottom).
Supply pinch
3-2. ELECTRICAL ADJUSTMENTS
Note: The adjustment should be performed in the order
given in this service manual.
The adjustments should be performed for both L-CH
and RCH.
® Simultaneous REC/PB Mode:
Input the signals to LINE IN terminal and set to
REC mode. Set the monitor switch to TAPE,
and monitor the recorded signal from LINE OUT
terminal.
@® Switch Position:
DOLBY NReevesssecsstcssscnscscsvcnscssssesscnsscerscess OFF
MPX FILTER coccecsscsscsssccsssesconscssssensessessees OFF
TIMER ccccssscessccssesensccrscsssscnscssssasecesossasseres OFF
MONITOR «cccrossccrscersccnscssescessensesscesssssooes TAPE
HX PRO ccccsssccensscceessesssscesescesscssessacrenssecees OFF
CALIBRATION crrerscecssceccecsscssnsscnssessessseeons OFF
CD DIRECT evccsreescsccesescceeesceueeccsenseeseneenses OFF
BIAS ccrrensccecscenscesssnaascnsstesesens CENTER CLICK
REC LEVEL coccsesstenssccssseesssees CENTER CLICK
BALANCEvrssccessesssscscesscesceecess CENTER CLICK
@ 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.
Standard Input Level
025 V (1088)
Takeup pinch
roller
Erasehead
Record/playback
roller
head
Standard Output Level
Output Terminal LINE OUT
aa VC5aB)
AF OSC
ee, attenuator '%®
oO
Oo—O O
11-000
haw es O
VTVM
6008) INE INPUT LINE OUTPUT
Torque Adjustment and Measurement
1. Load a torque meter cassette CQ-102C and push
pe button.
2. Adjust RV801 so that the reading on the torque
meter is 40+3g+¢cm (0.56 + 0.04202 « inch).
3. After the adjustment, apply suitable locking
compound to RV803.
Torque Reading
cQ-102C |35—45g+cm (0.49 — 0.640z* inch)
FWD
Back tension
FF/REW CQ-201B |7
0 — 120g*cm (0.97 — 1.670z+inch)
Record/ Playback Head Azimuth Adjustment
Procedure :
1. Mode: playback
test tape
P-4-A100S
(10 kHz ~10 dB)
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 0.5dB.
L-CH output
peak level within
1) dB within 1 dB
oO R-CH
peak
screw
aa
~~
lock-nut
position peak R-CH pe
peak
CQ-102C |6.5—11g+cm (0.09 — 0.150z+inch)

3. Phase check
By the means of 6. Tape Path check on page 9
confirm that phase difference is proper.
4. After the adjustment, lock the adjustment screw
with locking compaund.
Adjustment Location :
adjustment screw
Tape Speed/WOW Check
Procedure:
test tape
WS-48S frequency counter
(3 kHz, 0 dB) & WOW meter
47 k2Q
{f=
LINE OUT
Lor R-CH
1. Measure the output frequency and the WOW value
while playing back the tape top of the test tape.
2 Turn over the test tape, measure the output
frequency and the WOW value, and check the
difference from the values of the step 1.
Adjustment Limits :
TAPE SPEED deviation: within 2,990 to
3,010 Hz
TAPE SPEED fluctuating width: within 2,990 to
3,010 Hz
WOW (WRMS): 0.037 % or less
| TC-K333ESG/K950ES
Playback Level Adjustment
Procedure:
Mode: playback
test tape
P-4-L300 VTVM
(315 Hz, 0 d8)
ene | BE
LINE OUT
Adjust RV101 (L-CH) and RV201 (R-CH) to ob-
tain the specified LINE OUT level.
Adjustment Limits :
LINE OUT level: 0.42 to 0.46 V
(-—5.3 to — 4.7 dB)
Level difference between channels:
less than 0.5 dB
Check that the LINE OUT level does not change in
playback mode while changing the mode from
play back to stop several times.
MPX FILTER Check
Setting: DOLBY switch: OFF
MPX FILTER switch: OFF
Procedure :
1. Mode: stop
AF OSC
. attenuator
0 ——a
LINE OUT
LINE IN
315 Hz, 0.25 V (-10 dB)
2. Apply 315Hz, 0.25V (—10dB) signal and adjust
REC LEVEL (RV501) control so that the LINE
OUT level is 0.44V (-—5dB).
3. Set DOLBY switch to B or C and MPX FILTER
switch ON. Confirm that the LINE OUT level is
0.39V to 0.49V (-5dB + 1dB).
4. Apply 19kHz 0.25V (-10dB) signal and confirm
that the LINE OUT level is 0.013V (-35dB) or less.
Adjustment Limits :
LINE OUT level
315Hz 0.389V —0.49V (-5dB + 1dB
19kHz 0.014V (-35dB)
a | ee

TC-K333ESG/K950ES |
Bias OSC Frequency Adjustment
Procedure :
1. Record mode
blank tape
~ erase fr
head equency counter
—s| inductor Ge
1. Connect the frequency counter to the inductor
which functions at 10 mH. (When the inductor
is a closed magnetic circuit, redesign the
inductor to be anopenmagnetic circuit.
2. Remove the cassette lid, insert the cassette, and
put the unit into REC mode.
3. Move the inductor from the side in close to
the erase head to check the value of the bias.
4, Adjust CP501 so that the reading on the
frequency counter is 105kHz + 1kHz.
CrO. Bias and Record Level Adjustment
Note: This adjustment should be made before
Record Bias Adjustment.
Setting:
REC LEVEL knob: standard record position
(See page 10.)
HX PRO switch: ON
Procedure:
1. Mode: simultaneous REC/PB
LINE IN
315Hz, 25mV (-30dB)
lel 10kHz, 25mV (-30dB) —22*s!9nal tape
CO | attenuator
CS-122
rey
11,000 74
oscilloscope
LINE OUT
2. Adjust RV105 (L-CH) and RV205 (R-CH) so that
the playback output level of 10kHz signal
is 0.8dB to 0.3dB with respect to that of 315Hz.
¢ ¢ «Record Bias Adjustment.
3. Adjust RV102 (L-CH) and RV202 (R-CH) so that
the playback output level of 315Hz is -25.3dB to
-24,7dB. > + «Record Level Adjustment.
Metal Bias Adjustment
Setting :
REC LEVEL Knob: standard record position
(See page 10.)
Procedure :
1. Mode: simultaneous REC/PB
315H2z, 25mV( —30d8)
AF OSE 10kHz, 2SmV(—30d8) = no~signal tape
a) 10kQ LINE INPUT CS- 413
fe) attenuator
pk etlakel ale
o—=
tt, O00
LINE OUTPUT
2. Only when the level difference of 10kHz play
back output between L~ch and R-ch is 1dB or
more short or open EQ-tap for TYPE-IV (on the
conductor side of REC board).
3. Adjust RV510 so that the playback output level
of 10kHz in R-CH is 0.5dB to -0.5dB with
respect to that of 315Hz.
Normal Bias Adjustment
Setting:
REC LEVEL knob: standard record position
(See page 10.)
Procedure:
1. Mode: simultaneous REC/PB
LINE IN
10 kHz, 25 mV (—30 d&)
AF OSC 315 Hz, 25 mV (-30 dB)
no-signal tape
) a CS- 122
O| attenuator
omen |
000%
[ SS |
LINE OUT
2. Only when the level difference of 10kHz play
back output between L~ch and R~-ch is 1dB or
more short or open EQ@-tap for TYPE-I (on the
conductor side of REC board).
3. Adjust RV509 so that the output level of 10kHz
is 0.5dB to -0.5dB with respect to that of 315Hz.
a ae

Meter Level Adjustment
Setting :
REC LEVEL Knob: standard record position
(See page 10.)
MONITOR : SOURCE
Procedure :
1. Stop mode
AF OSC
LINE IN
315 Hz, 0.25 V (—-10 dB)
2. Adjust the REC LEVEL (RV501) control so that
the LINE OUT level is 0.44V (-5 dB ). In this time
adjust RV103 (L-CH) and RV203 (R-CH) so that
the OVU (-4 dB) segments of the meter light-up.
3. Adjust the REC LEVEL (RV501) control so that
the LINE OUT level is 1.9V (8 dB ). In this time,
make sure that all the segments of the meter
light- up.
| TC-K333ESG/K950ES
Calibration OSC and Calibration Meter Adjustment
Setting : CALBRATION switch: ON
Procedure (OSC OUT LEVEL):
1. Mode: record (no-signal (LINE INPUT))
VTVM -
no-signal tape
[A TPI CS-i22
8kHz
2. Adjust RV508 for 400Hz and RV507 for 8kHz to
obtain oscillation level within 10 +0.5dB
respectively.
Procedure (CAL METER ADJ) :
1. Put the set in record mode and adjust RV104
(HIGH) so that HIGH FREQ segments in the CAL
LEVEL meter light thoroughly up to 0 VU as
shown in the figure below. Segment (a) may
flicker.
2. Preset RV204 (LOW) so that segment (a) in LOW
FREQ CAL LEVEL meter lights. Then adjust
RV204 to the point where segment (a) goes out.
HIGH: LEVEL (a) may flicker.
HIGH
REC CAL FREQ L sans Gi a ces Sed ee
LOW RR ene ono cnn ame one one om cme cm eee
FREQ ‘
REC EQ CAL NORM
(a)
LOW: LEVEL (a) must not flicker.
a, (cae

TC-K333ESG/K950ES
Adjustment Parts Location :
REC EQ —~R-CH -
TAP ADJ
(TYPE 1)
L-CH— REC £0
TAP ADJ
(TAPE 1)
R-CH+
REC EQ
TAP ADJ
(TYPE 1V)
L-CH
:
s
:
|
‘
~
REC BOARD
— CONDUCTOR SIDE —
PLAYBACK LEVEL
ADJUSTMENT
RV101 (L-CH)
BACK
PANEL
SIDE
RV201
(R=CH)
REC LEVEL ADJUSTMENT
RV102 (L~CH)
RV202
(R-CH)
(REC
BOARD)
FWD TORQUE ADJUSTMENT
RV801
B| TP801
TP(TEST)
SYSCON BOARD
RV507 (8kHz)
RV508 (400Hz)
p
PLAYBACK BOARD | CAL OSC ADJUSTMENT
gs
REC BOARD
ite
can
BIAS
ADJUSTMENT
RV203.
(R-CH)
+++
NORMAL
RV509
rE WETAL RV510
CAL METER ADJUSTMENT RV105 (L-CH)
Cr0z \ py205(R-CH)
RV104 (HIGH) —+- g
RV204 (LOK) —+H 1
—COMPONENT SIDE — BIAS OSC FREQUENCY ADJUSTMENT
CP501 (105kHz)
—14—

SECTION 4
DIAGRAMS
4-1-1. IC BLOCK DIAGRAMS
IC503, 505 CX20188
RECORD IN 2! Vec
REC IN
1 REF
PB IN
CAL/REC/PB
PB FB
REC FB
PLAYBACK IN 2
LINE OUT 2
OFF/B/C
CAL IN
Vee
| TC-K333ESG/K950ES
4-2-1. IC503, 505 (CX20188) PIN FUNCTIONS
Description
Positive power supply terminal.
Recording input terminal.
Reference current input terminal.
Playback input terminal.
Calibration/recording/playback select terminal
Playback feedback terminal.
Recording feedback terminal.
GND terminal.
Line output (decode output) terminal.
Spectral skewing switch terminal.
Encode circuit input terminal.
HLS high-pass filter terminal.
HLS detector time constant terminal 2.
HLS detector time constant terminal 1.
HLS encoder error reduction terminal.
LLS detector time constant terminal 2,
LLS detector time constant terminal 1.
LLS encoder error reduction terminal.
LLS high-pass filter terminal.
Anti-saturation terminal.
Recording output (encode output) terminal.
Dolby NR off/B type/C type select terminal.
Calibration input terminal.
Negative power supply terminal.
1C517_ uPC1297CA
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TC-K333ESG/K950ES |
4-2-2. IC801 (M50964-220SP) PIN FUNCTIONS
Description
Power supply: +5V.
Analog GND.
A/D port reference voltage input.
Not used for this model.
Not used for this model.
Not used for this model. Connected to GND.
PAUSE LED output.
REC LED output.
PLAY LED output.
Key input. OV-4& , 1V=M, 2V=44, 3V=p>, 4V=@.
Key input. OV=P, 1V=90, 2V=i44, 3V=bbl, 4V=-O.
AMS signal input. No song detected = Low. Song detected = High.
Key input. 2V = DISPLAY. 3V = MONITOR.
Remote control category select switch.
Connected to 5V.
Take-up ree! base sensor input.
Supply reel base sensor input.
Model select input. Connected to GND.
Model select input. Connected to GND.
Not used for this model.
Power on and off detection.
SIRCS phase input.
SIRCS reverse phase input.
Timer REC switch input.
Timer PLAY switch input.
External interruption input. Interruption process is performed when the power is on
or off.
GND.
Reset input.
Clock input (4 MHz).
Clock output (4 MHz).
Not used for this model.
GND.
Rotary encoder input to detect the position of the head base of the mechanical block.
Rotary encoder input to detect the position of the head base of the mechanical block.
Rotary encoder input to detect the position of the head base of the mechanical block.
Rotary encoder input to detect the position of the head base of the mechanical block.
OPEN switch input of the mechanical block.
CLOSE switch input of the mechanical block,
DOOR switch input of the mechanical block.
REC switch input of the mechanical block.
Reel motor rotates at PLAY speed.
Reel motor rotates at FF/REW speed.
Reel motor rotates.
Reel motor rotates in reverse.
Head base DOWN output of the mechanical block
Head base UP output of the mechanical block
Counter light-off output
Meter light-off output
Bias oscillation on and off control
REC MUTE.
Not used for this model.
Tape MUTE. Goes to low when the tape is being played.
Source MUTE. Goes to low three seconds after the power is on.
AMS switch output. Goes to low when AMS is being used.
Not used for this model. Connected to GND.
Not used for this model. Connected to GND.
Outputs parallel data for the counter display.
Outputs parallel data for the counter display.
Outputs parallel data for the counter display.
Outputs parallel data for the counter display.
Outputs parallel data for the counter display.
Clock output to transmit the parallel data.
Output for latching the transmitted data.
CAL switch input.
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REC BOARD
FG BOARD

TC-K333ESG/K950ES
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4-6. PRINTED WIRING BOARDS — AUDIO SECTION —
A {PLAYBACK BOARD} . [SW BOARD] [METER BOARD]
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NORMAL
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—26—

TC-K333ESG/K950ES
4-7.
SCHEMATIC
DIAGRAM
~—
AUDIO
SECTION
—
,
|
1
2
3.
4
5
6
7
|
8
9
10
11
12
~
13
14
15
16
17
18
19
20
21
22
|
23
Ct
24 25
26
27
28
29
30
31
32
33
34
35
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