Toshiba RT-S652 User manual

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SERVICE DAT.
FILE NO. 110-288
TOSHIBA
STEREO RADIO CASSETTE RECORDER
HT-S692

1—3002
CONTENTS
1. OPERATING CONTROLS ..... 0.20... 0... cee ce eee 3
2. DISASSEMBLY INSTRUCTIONS ........... 0000 eee ee eee 4
3. ALIGNMENT INSTRUCTIONS ....... 0... 0. ce eee eee eens 5 to 8
4. DIAL CORD RESTRINGING .......... 0... ee eee 9
9: “BEOCK (DIAG RAM ik ieicr cece. hace siento de bans Maures «oe eee tetera le aigta ete tate 10
6. ELECTRICAL PARTS LOCATIONS........... 0.000: e eee eee e eens 11
7. SCHEMATIC DIAGRAM.......... Mlteasiapecenthaste ples tet Abgoeee ah Roa ects, leat Biel ae AGS 12
8-1. MECHANISM EXPLODED VIEW (UPPER)........... 00. 0ce ee ueeeeuee 13
8-2. MECHANISM EXPLODED VIEW (LOWER) .......... 0.2002 e ee ee eaee 14
9. MECHANISM PARTS LIST......... 0... cece ee tee 15
10. CABINET EXPLODED VIEW ......... cee et ne 16
11... CABINET PARTS LIST oo... nie eee eae Ge ee eee ee ee ee 17
12... “PARTS PEIST sor cvecisauds sede toe aed 2b aneniae Uae ere dd avid ways 18 to 21
Nameplate

| RT—S652
1. OPERATING CONTROLS
CONTROL FUNCTIONS
OOS ©
®@®O™® @©® ©
) @)
©
@ ©® ®
@
[AM]
BAND]
Selector
42)
[LOUDNESS]
Button
When
listening
to
low
level
sound,
press
this
buiton,
(2)
[FUNCTION]
Selector
The treble and bass tones are amplified to give a more
@) FUNCTION [ON-OFF/TAPE] Selector. natural sound.
Note: When the accessory AC adaptor is used, it will be
left powered even when the [FUNCTION] selector
of the recorder is set to OF F/TAPE. [TONE] Control
When the recorder is not to be used, be sure to (8) [BALANCE] Control
unplag the AC adaptor from its outlet.
G3) [VOLUME] Control
Built-in Microphones
@ [TAPE] Selector ) Tweeters (Speakers for high-pitched sound)
[TAPE] selector Woofers (Speakers for iow to mid-range sound)
CrO2 METAL :
t
METAL
=
[BATTERY]
Indicator
cro, 7s @0 [FM STEREO] Indicator
ees
com
@)
[TUNING]
Indicator
Note:
!f
the
[
D238]
button
is
left
depressed,
the
CrOz,
@)
Tape
Counter
and
Counter
Reset
Button
NORMAL position will not be selected even when @ MTSS [SET] Button
the [CrO,] button is pressed.
(5) [/ASTOP/EJECT] Button
(6) [PONE TOUCH RECORD] Button
@ [>> REVIEW/REW) Button
[<PLAY] Button
() {« FF/CUE] Button
4) MTSS [RESET/EDITOR] Button
@5) [REC] Indicator
6) [MTSS] Indicator
@?) Tuning Knob
[MIC] Jacks
Microphones with 3.5 mm plugs
[11PAUSE]
Button
@9
[REC/PB]
Jack
a)
[MODE/BEAT]
Selector
@
[EXT
SPEAKER]
Jacks
Input
impedance
from
3.2
to 8
ohm
[MODE/BEAT]
selector
__MONO
__
|[STEREO-WIDE
Gi)
[PHONES]
[T]
Jack
MONO
62)
[PHONES]
[2]
Jack
STEREO
r
STEREO-WIDE
63
[DC
9
V]
Jack
=
When
accessory
AC
adaptor
is
to
be
used,
connect
it
to
~
this
Jack.
Note: If [MONO] button is left depressed, the STEREO,
STEREO-WIDE mode will not be selected even G4 Telescopic Antenna
when the [STEREO-WIDE]} button is activated.

~ RT-S652 |
1.
2. Unscrew two screws (A) and five screws (8). Fig. 1.
. Open the cassette cover by pressing the Stop/Eject
CASSETTE MECHANISM ASS’Y REMOVAL
1. Follow the instruction for Front Cabinet Removal.
MAIN P.C. BOARD REMOVAL
1. Follow the instruction for Front Cabinet Removal.
NS
om F Ww
. Disconnect the speaker and MQJS connectors to
. Reassemble in the reverse order.
. Unscrew one screw (C). Fig. 2.
.
Diconnect
the
Motor
and
the
Head
connectors
©).
. Take off the Cassette Mechanism Ass’y from the Back
. Pull out the Balance, Tone, Volume, Loudness, Mode,
. Pull up the Main P.C. Board from the Back Cabinet.
. Reassemble in the reverse order. DTBID Hd. Tapping 3d x 10mm& RED
2. DISASSEMBLY INSTRUCTIONS
¢———p>
FRONT CABINET REMOVAL DTBID Hd. Tapping
3d x 52mm
Pull out the Tuning and Fine Tuning Knobs.
button.
separate the Front Cabinet from the Back Cabinet.
DTBID Hd. Tapping 3d x 35mm BLK
Figure 1.
Fig. 2.
Cabinet.
Reassemble in the reverse order.
DTBID Hd. Tapping 3d x 20mm RED
Figure 2.
DTBID Hd. Tapping 3d x 16mm RED
Tape Selector, Function and Band Switch Knobs.
Remove the spring ©. Fig. 3.
Unscrew four screws () and two screws @. Fig. 3.
Figure 3.

| RT—S652
3. ALIGNMENT INSTRUCTIONS
fe
L193
Re
Ant,
Coil
h
awe!
i
.
TP2 TPI
FM IN
LW Ant. SW Ant.
colo co09
@Xo) ae
‘
eTP6
Free Run
re
. Ose.
ue R203 . TP4 SW Ose. (e)
Free Run
Sw “le
AM IF L109
Zz) AM IF
FM IF LIII
euo DET.
Output ‘Zz
TP3° }
Figure 4.
TEST EQUIPMENT
. Signal generator with a frequency range of at least from 140 kHz to 23 MHz AM.
. Oscilloscope with a side range amplifier of approximately 100 kHz.
. Test loop — a coil of any size wire, one turn or more. (LW & MW)
. A 30 ohm dummy antenna. (SW)
VTVM
a hwWN =
AM ALIGNMENT
. Turn on the AM signal generator and the VTVM allowing a fifteen-minute warm-up period.
. Using the test loop across the output of the signal generator, inductively connect the signal generator to the radio.
. Connect the VTVM across the voice coil or a 3.2 ohm dummy load.
PWN =
. Set signal generator frequency as listed in ALIGNMENT CHART and maintain a sufficient output level to provide
an indication on VTVM.
a
Set volume contro! at mid-position.
6. Proceed as outlined in the IF-LW, MW and SW ALIGNMENT CHART.
AM 460kHz
ONE-TURN COIL
Figure 5.

R1—-s652 |
AM SIGNAL
GENER-
ATOR if
= ; UNIT UNDER TEST
Figure 6.
MW ALIGNMENT CHART eS
Signal
Generator
Frequency
Radio Dial Setting
Tuning Gang Fully Counter-
clockwise
(Lowest Frequency)
460 kHz
}-—-—
PHONES
JACK
Adjustment
$$} —__.
Remarks
Li09
L110
Adjust for maximum
indication.
Tuning Gang Fully Counter-
clockwise
(Lowest Frequency)
510 kHz
OSC. Coil
L107 (MW)
Adjust for maximum
indication.
Tuning Gang Fully Clockwise
peak (Highest Frequency)
OSC. Trim.
C007
Adjust for maximum
indication.
R 2 3 ired.
eae epeat steps 2 and 3 as require
600 kHz Tune to Signal.
Ant. Coil
L104 (MW)
Adjust for maximum
indication.
1400 kHz Tune to Signal.
Ant. Trim.
C005
Adjust for maximum
indication.
Repeat steps 5 and 6 as required.
LW ALIGNMENT CHART
Signal
Generator
Frequency
Radio Dial Setting
Adjustment
Remarks
Tuning Gang Fully Counter- |
clockwise
(Lowest Frequency)
142 kHz
OSC, Coil
L108
Tuning Gang Fully Clockwise
280
kHz
(Highest
Frequency)
OSC. Trim.
C012
Adjust for maximum
indication.
Adjust for maximum
indication.
Repeat steps 1 and 2 as required.
160 kHz Tune to Signal.
Ant. Coil
L103
Adjust for maximum
indication.
280 kHz Tune to Signal.
Ant. Trim.
C010
Adjust for maximum
indication.
t.
Repeat steps 4 and 5 as required.
30 ~ 33 ohm
30 ~ 33 ohm
dummy antenna
Figure 7.
_="G 2s:

| RT—S652
SW ALIGNMENT CHART
Signal
Generator Radio Dial Setting Adjustment Remarks
Frequency
Tuning Gang Fully Counter-
5.75 MHz clockwise
(Lowest Frequency)
OSC. Coil Adjust for maximum ‘
L106 indication.
Tuning Gang Fully Clockwise OSC. Trim. Adjust for maximum
Toe (Highest Frequency) C011 indication.
Repeat steps 1 and 2 as required.
Ant. Coil Adjust for maximum
L102 indication.
Ant. Trim, ’ Adjust for maximum
Ccoo9 indication.
6.5 MHz Tune to Signal.
14 MHz No Adjustment
Repeat steps 4 and 5 as required.
FM-IF ALIGNMENT
. Set the select switch to FM position.
. Turn on both sweep generator and oscilloscope, and allow a fifteen-minute warm-up period.
. Connect the RF SWEEP SIGNAL OUTPUT from the signal generator through the loop antenna to the receiver.
. Connect the oscilloscope vertical input directly to the test point TURN OUT H and connect the shielded lead to
the test point E or chassis ground. :
5. Connec the SWEEP VOLTAGE OUTPUT of the sweep generator to the oscilloscope.
6. Proceed as outlined in the FM-IF ALIGNMENT CHART.
PWN =
FM-IF ALIGNMENT CHART
Signal coupling Equip. Tuning Connection Pattern
Connect sweep Sweep Tuning Knob | Set scope for con- Turn the !F Transformer
generator output to | generator of | fully counter- | necting output L111 fully counterclock-
a three-turn loop 10.7 MHz clockwise signal from TUN wise to obtain a single
antenna of 10cm center freq. (Lowest OUT to vertical peak. Adjust coil L105
diameter. with 10.7 Frequency.) axis of scope “V"’ in order until the best
MHz marker. and sweep gener- single peak is obtained.
ator output to Figure 9.
horizontal axis Finally turn the coil
“H", L111 to obtain S curve.
See Figure 10.
IF Seeep Test
FM
Sweep
Receiver
S
Curve
Generator
under
test
ae
aS
Figure
8.
-
F
igure
3-turn
Loop
Antenna
located
near
the
LOO2.
Figure
9.
Figure
10.
FM-RF ALIGNMENT
1. Turn on the signal generator and the VTVM, and allow a fifteen-minute warm-up period.
2. Connect the signal generator output through a 75 ohm dummy antenna across FM ANT.
3. Connect the VTVM across the voice coil or a 3.2 ohm dummy load.
4. Set the volume control to mid-position. 7

iT—S652 |
5, Adjust the signal generator frequency as indicated in FM-RF ALIGNMENT CHART, and maintain a sufficient signal
output level to provide a measurable indication.
6. Proceed as outlined in the FM-RF ALIGNMENT CHART.
FM-RF ALIGNMENT CHART
Step Signal Generator Radio Dial Setting Adjustment Remarks
Tuning Knob fully P : ,
1 87.5 MHz Counterclockwise O2G fol! AaeE IO eal a ae
indication.
(Lowest Frequency)
Tuning K full
ee nob sully OSC. Trim. Adjust for maximum output
2 108 MHz Clockwise C003 indicate
(Highest Frequency) pee
3 Repeat steps 1 and 2 as required.
4 90 MHz Ant. Coil
_ LOO1 Adjust for maximum output
Tune to signal RAGE indication
nt. Trim .
5 106 MHz ;
e C001
6 Repeat steps 4 and 5 as required.
Headphone
SET Jack
DUMMY
ANTENNA
50 ohm
FREE RUN FREQUENCY ALIGNMENT
Adjust R203 under no signal condition so as to obtain
38 kHz + 75 Hz.
CAUTION:
When realigning the FM Receiving Frequency, the highest
end of the frequency range should not be more than 108
MHz and the lowest end of the frequency range should not
be less than 87.5 MHz, in order to comply with FTZ regula-
tions in West Germany.
RECORD/PLAYBACK HEAD ADJUSTMENT
A 6.3 kHz test tape must be used for this adjustment.
Connect a VTVM or an oscilloscope to the headphones
jack or speaker terminal and adjust the azimuth by using a
phillips screwdriver to maintain the maximum output
voltage.
TAKE-UP/SUPPLY REEL TENSION
1. Insert cassette torque meter (HARTAK X-87 Torquette).
Figure 11.
Frequency
V.T.V.M. Counter
3.2
ohm
Figure 12.
Record/Playback Head
Record/Playback Head Adjustment
Figure 13.
2. Press PLAY button and read torque meter. Torque should be 35 to 65 gcm.
3. Release PLAY button and press REWIND button. Torque should be 60 to 160 gcm. !f necessary, clean take-up
reel or drive belt with alcohol, or replace belt.

5. BLOCK DIAGRAM
RT—S652
RT—S652
4. DIAL CORD RESTRINGING
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YOUMS
( 2 turns
Ve
<> - Cement after tying twice.
Eyelet
uu
3mm.
s
Cut less than
Drum
Figure 14.
9
Dial cord
363 + 0.5 mm
Spring
4. Turn the tuning shaft fully counterclockwise.
5. Set the pointer to the cord.
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2. Wind the dial cord in numerical order after passing through the hole of drum.
1. Turn the shaft of poli-variable capacitor fully clockwise.
3. Hook the spring to the drum after completing winding.
DIAL CORD STRINGING

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Q702
D701
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| RT—S662 RT—S652 | ,
6. ELECTRICAL PARTS LOCATIONS
pa | o [42| 0
703
[2 PB] o | olor
Lov | ov
tf 2a
7) es [ofolute
030! | 8.8V
3 = 5 [6
4.5v[ ov [os5v[ ov [5iv
Ov | OV | 05V| B8V 145V} 9V
E
cls
Tweeter
Speaker (L)
Battery
Spring
Battery
Battery
Contact
Speaker (L).
Built-in Mic P.C.B. (L)
Woofer
Q302 | OV |2.3VjO7V
Speaker (R)
MQJS P.C.B.
fem Ble ince a5
Q407
Tweeter
Speaker (R)
o7oi[ 1/2]; 3 [4/5 [é6[7][alfo
Mos |S59vjoevjo7v] o | o [s8viorvioivi6sv)
3.4V|2.8V| 3V
fe jec ]e]
1501 TRC OSC(5203)
ee eae ae
ref 0 fesv] o farviiaviiav{ 0 {9 [0 | 0 faviisvle
Figure 16.
earl i [2{[3[4][5]6 8 | 9
FM [27v/3.4v/4 25V|25V
AM 27V|27Vj
213 /4[5]6
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[001 |
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Record
fi. Wo Ee
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Proybac Head
5 Pin Socket