Fm Tuner Section
 Fm Tuner Section
Frequency range:
Usable sensitivity:
Signal-to-noise ratio:
Capture ratio:
Frequency response:
Stereo separation:
A-m Tuner Section
Frequency range:
Sensitivity:
Signal-to-noise ratio:
Audio Amplifier Section
Continuous RMS
power output:
(rated output, less than
0.2% THD)
SPECIFICATIONS
87.5 MHz to 108 MHz
1.6 AV (S/N = 30 dB)
70 dB
1.0 dB
20 Hz to 15 kHz +1 dB
Better than 38 dB at 400 Hz General
530 kHz to 1,605 kHz
53 dB/m, built-in bar antenna
at 1,000 kHz
30 HV, external antenna
Power consumption:
50 dB at 50 mV/m
Both channels driven simultaneously
35 + 35 watts (8 ohms) at 20 Hz
to 20 kHz
45 + 45 watts (8 ohms),
55 + 55 watts (4 ohms) at 1 kHz
Dynamic power output:
(IHF constant power
supply method)
Harmonic distortion:
System:
Power requirements:
Dimensions:
Net weight:
Driven separately at 1 kHz (each channel)
60 watts (8 ohms)
80 watts (4 ohms)
136 watts total (8 ohms)
200 watts total (4 ohms)
Less than 0.2 % at rated output
Less than 0.1 % at 1 watt output
Superheterody ne fm/a-m,
Switching MP X
Complementary symmetry circuit
(SEPP OTL) -
Direct output coupling
100, 120, 220, 240 volts 50/60 Hz
300 watts
471 (w) x 157 (h) x 375 (d) mm
18% (w) x 6% 6 (h) x 14% (d) inches
15.3 kg (33 Ib 11 02)
SERVICE MANUAL
Is
TABLE OF CONTENTS
Section | Title Page
SERVICING NOTES .. 1.111111 LL LL LE 1
1. TECHNICAL DESCRIPTION
1-1. Specifications. 2. 2
1-2. Circuit Description Digest 3
1-3. Level Diagram 6
1-4. Block Diagram 7
2. DISASSEMBLY AND REPLACEMENT
2-1. Bottom Plate Removal . . .. . .... 9
2-2. Front Panel Removal . . . . .. 9
2-3. Dial-Cord Restringing. . . . ... 111110 9
2-4. Power Transistor Replacement . . . . . . aa e... 10
2-5. Dial Glass Removal... U
2-6. Meter Replacement... . .
2-7. VOLUME Control Replacement . . . , , . = = a Al
2-8. Control, Jack and Switch Replacement. . . . . . . e. 12
2-9. Chassis Layout . . 3
3. ALIGNMENT AND ADJUSTMENTS
3-1. Em IE Strip Alignment. Ly
3-2. Fm Discriminator Alignment . . . _ aa aa 15
3-3. Fm Frequency Coverage Alignment . .. aa a a a. 16
34. Fm Stereo Separation Adjustment . .... = aa. 16
3-5. Muting Adjustment... . LL 11001
3-6. A-m If Strip Alignment aaa aa 18
3-7. A-m Frequency Coverage and Tracking Alignment . .. . .......18
3-8. TUNING Meter Calibration .... aaa aa 19
3-9, Power Amplifier Adjustment . . . aaa 21
4, REPACKING. LL 111111 LL LL 22
5. DIAGRAMS
5-1. Mounting Diagram — REC/PB Connector Board — . . 1 4 2 2 1. . 23
5-2. Mounting Diagram — Loudness Control Board —..... .. . 23
5-3. Mounting Diagram — Fm Front-End — . ... aaa. 24
5-4. Mounting Diagram — A-m Front-End/I-f Amplifier/MPX Board —. . . 25
5-5. Schematic Diagram — Tuner Section — . . a. 27
5-6. Schematic Diagram — Audio Amplifier Section —. ... _ «. . 29
5-7. Mounting Diagram — Control Board —. . .. .. .. . ‚.. 31
5-8. Mounting Diagram — Power Amplifier/Power Supply Board — . . . . 33
6. EXPLODED VIEWS LL. 11111 LL LL as
7. ELECTRICAL PARTS LIST PET tete ee 4 LL LL 1111. 40
1.
a.
CAUTIONS ON HANDLING IC’s
Excessive heat may destroy an IC. Never reinstall
a used IC. |
. Check the related components for defects before
replacing the IC.
. When installing new IC’s, do not apply excessive
heat. Solder quickly while holding a wet rag on
the heat-sink tab as shown in Fig. A,
. Do not short adjacent IC leads when performing
electrical checks as this might damage the IC.
. Always solder the IC heat sink to the printed
circuit board to avoid damage.
heat sink tab
\
wet rag
Fig. A. IC installation
STR-7055
SERVICING NOTES
2. NYLON RIVET REMOVAL
a. To remove the nylon rivet, push its end with a
tweezers as shown in Fig. B.
b. To reinstall the rivet, insert the flared part into
the opening first, then push its head as far as it
will go.
rear panel
nylon rivet
S_ Push out
Fig. B. Nylon rivet removal
STR-7055
Fm Tuner Section
Frequency range:
Intermediate
frequency:
Sensitivity:
Image rejection:
I-f rejection:
A-m suppression:
Capture ratio:
Selectivity:
Signal-to-noise
ratio:
Frequency
response:
Harmonic
distortion:
Stereo separation:
19 kHz, 38 kHz
suppression:
SCA suppression:
Frequency range:
Antenna:
Intermediate
frequency:
Antenna terminals:
Spurious rejection:
A-m Tuner Section
SECTION 1
TECHNICAL DESCRIPTION
1-1. SPECIFICATIONS
87.5 MHz to 108 MHz
300 ohms balanced
75 ohms unbalanced
10.7 MHz
2.0 uV (IHF)
1.6 uV (S/N = 30 dB)
70 dB
100 dB
90 dB
56 dB
1.0 dB
70 dB, IHF
70 dB
20 Hz to 15 kHz = 1 dB
Mono 0.2 % at 400 Hz, 100 %
modulation
Stereo 0.5 % at 400 Hz, 100 %
modulation
Better than 38 dB at 400 Hz
40 dB
55 dB
530 kHz to 1,605 kHz
Built-in bar antenna and
external antenna terminal
455 kHz
Sensitivity:
Image rejection:
I-f rejection:
Signal-to-noise
ratio:
Harmonic
distortion:
53 dB/m, built-in bar antenna at
1,000 kHz
30 u V, external antenna
50 dB at 1,000 kHz
40 dB at 1,000 kHz
50 dB at 50 mV/m
0.8% at 50 mY/m
Audio Amplifier Section
Continuous RMS
power output:
(rated output)
(Less than 0.2 %
THD)
Dynamic power
output:
(IHF constant
power supply
method)
Power bandwidth,
JHE:
Damping factor:
Harmonic
distortion:
IM distortion:
(60 Hz : 7 kHz
=4:1)
Frequency
response:
Both channels driven simultaneously
35 + 35 watts (8 ohms)
at 20 Hz to 20 kHz
45 + 45 watts (8 ohms),
55 + 55 watts (4 ohms) at 1 kHz
Driven separately at 1 kHz
(each channel)
60 watts (8 ohms)
80 watts (4 ohms)
136 watts total (8 ohms)
200 watts total (4 ohms)
15 Hz to 35 kHz
50 (8 ohms)
Less than 0.2 % at rated output
Less than 0.1 % at 1 watt output
Less than 0.2 % at rated output
Less than 0.1 % at 1 watt output
RIAA equalization curve
PHONO
+ 1 dB
AUX
TAPE 0
(input)
ESL
+
POWER 10 Hz to 100 kHz - y dB Loudness control: + 10 dB at 50 Hz, + 4 dB at 10 kHz
AMP at 1 watt output (Attenuation : 30 dB)
Signal-to-noise ratio: General:
S/N | Weighting network | Input level System: Superheterodyne fm/a-m, switching MPX
Complementary symmetry circuit
PHONO 70 dB B 3 my (SEPP OTL), Direct output coupling
AUX
| Power |
ТАРЕ 50 59 OH
90 dB A 250 mv | requirements: 100, 120, 220, 240 volts 50/60 Hz
REC/PB
(input) Power
POWER AMP | 100 dB E consumption: 300 watts
Dimensions: 471 (w) x 157 (h) x 375 (d) mm
В 18% (№) х 6716 (№) х 14% (d) inches
Input sensitivity and impedance:
| Net weight: 15.3 kg (33 1b 11 07)
Maximum sensitivi Impedance
Ну | mpedanc Shipping weight: 18.6 kg (41 Ib 2 ог)
PHONO 2 mV 47 k ohms
AUX
1-2. CIRCUIT DESCRIPTION DIGEST
TAPE , ao o
150 mV 50 k ohms 1. Noise Elimination Circuit for Tuner Section
REC/PB а Ш |
(input) This circuit is used to eliminate noises due to
B+ voltage fluctuation of tuner when changing the
POWER AMP 1 Y 50 k ohms FUNCTION switch S1 to FM or AM from other
position. Referring to Fig. 1-1, when S1 is changed
Note: Maximum sensitivity means the input
level at which the rated output is pro-
vided into 8 ohms (with both channels
driven at full volume) at 1 kHz.
Tuner, в (+)
Output level and impedance: FM tuner | Q806
Level Impedance
Q802
REC OUT 250 mV 10 k ohms (REGULATOR)
REC/PB
30mV | 82k oh |
(output) a ES {3 S1-1-3 . 4: D801
|
P | AUX « PHONO + [FM]> Ам + TAPE + TAPE A: D802
a 1V | 47k ohms e
- 0206 | Tazas | Azer 06 7
R243 |
A249 0207
HEADPHONE: Accepts all low and high impedance | | А (MUTING)
headphones. | R244 206 T C230
(MUTING)
SPEAKER: Accepts 4 ~ 16 ohm speakers. |
Tone controls: BASS +10 dB at 100 Hz Fig. 1-1. Noise elimination circuit for tuner section
TREBLE +10 dBat 10 kHz .
High filter: | 12 dB/oct. above 9 kHz
Low filter: 12 dB/oct. below SO Hz
STR-7055
to FM, Q806 is gradually turned on due to the
time constant circuit of R819 and C809 and sup-
~ plies B+ voltage to the FM tuner circuit.
However, Q206 is turned off during the time con-
stant of R247 and C230 since Q806 is turned on,
killing the detector output.
Thus, the “pop” noise is completely eliminated
through these two circuits.
R820 is for discharging C809 when FM circuit is
disengaged.
When $1 is changed to AM, Q807 is gradually
turned on due to the time constant circuit of
R818 and C823, supplying power to the a-m local
oscillator at A-M mode.
. Audio Muting Circuit
This muting circuit is used to eliminate the
“pop” noise generated when the POWER switch
is set to ON or OFF and operates as follows:
Referring to Fig. 1-2, when the POWER switch is
set to ON, B + and B — voltages increase quickly to
its normal operating voltage. Q803 is off due to
the long time constant circuit of R808 and C807.
0804 and Q603 are forced into conduction as
the bleeder circuit R810, R811 and R812 are
designed so that the point “C” becomes positive.
Thus, noises in the pre-stage amplifiers are effec-
tively grounded through Q603.
About 2.5 seconds later after POWER switch is set
to ON, Q803 is on as C807 is fully charged. This
grounds point “D”, forcing point “C” negative.
As a result, Q804 and Q603 are off, stopping the
muting. Conversely, when the POWER switch is
set to OFF, Q803 is immediately turned off as
C807 is discharged by R807. C808 holds positive
voltage due to the long time constant circuit of
R809 and C808, and D809 (reverse resistance).
As a result, Q804 and Q603 are turned on, thus
PREAMP QUT is effectively grounded.
Referring to Fig. 1-3, Q805 removes the residual
“pop” noises caused by unbalanced discharging
characteristics of B+ and B— power supply circuit
at power off. These noises cannot be removed by
the muting circuit previously described.
Q805 operates as follows:
Q805 is normally off, as the base ¢ircuit is reverse
biased due to the bleeder circuit.
After power is off, when the difference of absolute
value of B+ and B— exceeds some extent, Q80$ is
forward biased and C901 is discharged quickly
through Q805 and R817, maintaining equal dis-
charging of B+ and B— power supply.
29, B +
= +R810
0803 | rar PLY авоз
R811
RAT PREAMP
OUT
© #r812
3
Le! . -
1807 joe | B—
R807
11 Vac
R808 D808
Fig. 1-2. Audio muting circuit (1)
a B —
= R817 |
4
R815 = c902
| в»
Fig. 1-3. Audio muting circuit (2)
3. Speaker Protection Circuit
In a direct-coupled power amplifier, sorne
faults in transistors appear a large dc voltage across
the speaker output terminal.
This might damage a delicate speaker system. The
speaker protection circuit is used to remove the
dc voltage as shown in Fig. 1-4.
The speaker protection is performed by two ways.
One is the circuitry itself (self-defensible) and the
other is additional protection circuit (Q708, Q709
and Q710).
They operate as follows:
(1) In case that any of power transistors (Q7D6,
Q707, Q901 and Q902) shorted.
If Q901 is shorted, for example, excessive
current flows in this transistor and a large
positive dc voltage will appear across the
speaker output terminal (point “a” in Fag.
1-4).
This voltage is fed-back to the base of Q703
through R710. Q703 is turned off and Q7D5
is excessively forward biased. Thereby, large
a
3
A
2
a
a
#
3
E
4
Lo
3
£
3
#
À
Ü£
7
a
(2)
bias voltage enough to short Q902 is applied
to the base of Q707.
Ás a result, excessive current flows in Q901
and Q902, pulling voltage at point “a” back
to zero, then the fuses in the power supply
circuit are blown. Same is true when Q902
is shorted, except for the negative dc voltage
at point “a”. Then Q705 is off and Q901 is
forced to short. Thus, speaker is protected
even if one of the power transistor is shorted
by accident, by forcing the other power
transistor into secondary break-down.
In case that any of Q701, Q702, 0703 shorted
Q70S 1s forced to either excessively forward
biased or cutoff.
When Q705 is excessively forward biased
Q707 and Q902 are turned on and negative
de voltage will appear at point “a”. This
voltage turns Q709 and Q710 on, shorting
Q707 base to ground. As a result, current
flows in Q707 and Q902 decrease and the
“a” voltage becomes effectively low.
point “a
When Q705 is forced to cutoff
Q706 and Q90! are turned on and the posi-
tive dc voltage will appear at point “a”.
This voltage turns Q708 on, shorting Q706
base to ground and maintaining the point
64.393
a voltage low as previously described.
в
2
=
a
<
«=
Y rr
0705
AAAÁ
y Y YY
714
A a
Y
ы =)
=>
=
Q704 Q708
AAA
TT
>]
AMA
Y 7 Q710
R715
AAA A
TYVY
Q709
Q902|
Q707
R710
AAA
"YY
CB701: Circuit Breaker
Fig. 1-4. Speaker protection circuit
1-3. LEVEL DIAGRAM
Note: Signal voltages are measured with ac VTVM and
expressed in dB referred to 0.775 V, 1 kHz.
dB
30 o
78608 SPEAKER OUT
(20.1 V)
20 / 50.3 W/8 2
(2
1 (5)
0 = PRE OUT —=-—
\2/ 2dB (1 V) / 8.2 dB (2 Y)
0 7 500 mW/8 9
I .
J pe /
— 30
(2)
_ Ц . AUX Le
10 7— TAPE 7 50m REC OUT 7
VEN | ‚7—7 (250 тупее —
— 20 Г
173)
— — REC/PB OUT
—28 dB
(31 mV)
—48 dB (3 mV)
PHONO
PHONO 0—
aux Г
TAPE 0—
BALANCE 5 (6)
REC OUTo—x
D
7 7
DA
2 FE
pS >
REC/PB
Connector | \°
R-CH
—
° РОИЕЯ AMP /
7 0607 A | 0602 : 0201 — 0205 sP OUT
TONE
1-4. BLOCK DIAGRAM
ANTENNA - TON |
TERMINAL FM FRONT-END SECTION CERAMIC CERAMIC DISCRIMINATOR
| FILTER FILTER TRANSFORMER ~~ SCA TRAP
BALUN FM RF AMPI MIXER FM I-F AMP FM 1-Е АМР FM 1-F AMP MUTING
y 108 В me e FM! A 3- MIXE IFT101 tel PM 1 CF201 [amd EM LF APL wd CR202 [ай] М 10201 7201 L201, C221 a MUT)
| TUNING METER
[75 8 ; 4 à D202 M901
FM OSC AFC 5 LA |
AM , т 3 | 0704 - 0101, D102 |* © — |
D205 *
FM 1-F AMP | MUTING
. . - 0204 —=| 7202 »——1 0205, 0206 о
| | _ 0204 / MUTING SW
RT201 | /
455 kHz FILTER Tn
CFT401 0203 I | LEVEL ADJ
TUNING METER
CALIBRATION |
i >—
— 1C401 + AC O
RT401 To Fm Front-End 19 kHz TANK 38 kHz
Г” HBO CIRCUIT COIL
A-M OSC COIL POP NOISE D206 | mMU301 | | 7307 |
7401 © MUTING LPF | | PREAMP
0806 CP301 0301, 0303 | ©
| | O > O
POP NOISE o @ 1 ODE SW a
MUTING LPF PREAMP To R-CH
= RT301 CP302 0302, 0304 101
STEREO To MODE SW
SEPARATION | | (sa)
A-M FRONT-END/1-F AMP/MPX SECTION
CONTROL SECTION POWER AMP/POWER SUPPLY SECTION
£
AUX (O О POWER"
| EQUALIZER AMP $1 PREAMP iN
A
PHONO(O) > REGULATOR DC BIAS
ow 0701 0704
- O! р 56 | FILTER 56 Т | e Mi
VOLUME TONE |
TAPE-1 (O о es CONTROL | CIRCUIT
O и CONTROL] FLAT AMP ae SEL | prepriver| | BREAKER
—> | | | 0702, 0703 Q705 SPEAKER
| ——# BUFFER AMP| 3 BUFFER AMP ba] DRIVER |, |POWER AMP| |! OUTPUT
TAPE2 e 4 < | HIGH | > Q602 > Q707 0902
| FILTER
BALANCE]
CONTROL AC/DC FEED-BACK
-7 O AM r SPEAKER
REC OUT. O У | + À PROTECTION
| 0805 Q603 Q708, Q709, Q710
MUTING -
REC OUT-2(0) 1 —W соо то вся - S le Mes 0804 |
MUTING | To R-CH
REC/PB О М 0808 Q653 O
Cannector | REGULATOR RECTIFIER PO
0807, 0802 803, D804 FO POWER VOLTAGE AC |
Sl: FUNCTION SW . - с - 2805, D806 TRANSFORMER|—] SELECTOR NPUT
; 52,83: . MONITOR SW 8) A O e Rl
$4: MODE SW ‘ 8 X
$5: LOUDNESS SW |
56: FILT -
| ER SW
To R-CH - -
2-1.
Fig. 2-1.
SECTION 2
DISASSEMBLY AND REPLACEMENT
Note: All screws are Phillips (cross recess) type
unless otherwise indicated.
{(—): slotted head
BOTTOM PLATE REMOVAL
Remove the eight self-tapping screws shown in
This frees the bottom plate.
2-2. FRONT PANEL REMOVAL
>)
‘о
Remove all the knobs on the front panel.
Remove the three self-tapping screws shown in
Fig. 2-1. |
9,73
So 8
Ht dt
Remove the three screws shown in Fig.
This frees the front panel.
B 3 x 8, self-tapping
front panel removal
a
| bottom plate removal |
(9 | B3x 8, self-tapping
| power transistor
nt
a mc rem
— replaceme
B 3 x 8, self-tapping
| bottom plate removal
Fig. 2-1. Bottom plate and front panel removal
PSW3 x6
front panel removal |
er replacement
LA
2-3. DIAL-CORD RESTRINGING
Preparation
I. Cut a 1,600 mm (63-inch) length of 0.3 mm
| (‘/64-inch) diameter dial cord.
2. Turn the tuning capacitor shaft fully clockwise.
3. Install the tuning drum as shown in Fig. 2-4.
4. Tie the end of the cord to a spring as shown in
Fig. 2-3.
Hook the spring to the stud of drum as shown in
Fig. 2-4.
4
Fig. 2-3. Tying square knot in the tension Sprirzy
Procedure
1. String the dial cord in order as shown in Fig. 2-4.
ba
Fa
Note: At the finish point, pass the doubled
end of the cord through the eyelet (see
Fig. 2-5) and tighten the cord and squeeze
the eyelet so that the spring is under
tension. Make two knots in the cord end
to keep it from slipping out of the eyelet
as shown in Fig. 2-5.
After completing the dial cord stringing, make
sure that the tuning system properly works.
Put the pointer on the pointer guide as shown in
Fig. 2-6 and bend the pointer guide tab as shh=vn
in Fig. 2-7,if necessary.
Tune the receiver to the local fm station. No ve
the pointer to the position where the dial inäca-
tion coincides with the local station’s carrierfre-
quency. Apply a drop of contact cement to it.
| STR-7055
pulley “С”
РУ
tuning shaft
{Two counterclockwise
| turns) (top view)
pulley CE”
tuning drum finish point
(at fully
clockwise
pulley “A’ position)
N
start point
tuning drum
Fig. 2-4. Dial cord stringing
—
|
Fig. 2-5. Details of dial cord finish
pointer
Fig. 2-7. Dial pointer installation (2)
2-4. POWER TRANSISTOR REPLACEMENT
1. Remove the twelve self-tapping screws (eight at
rear bottom and four at rear top) as shown in
Fig. 2-1 and Fig. 2-8.
2. Remove the two screws securing the power tran-
sistor to the heat sink.
e
Note: When replacing the power transistor,
apply a coating of a heat-transferring
grease to both sides of the mica insulator. DR
Any excess grease squeezed out when =
‘the mounting bolts are tightened should 8
be wiped off with a clean cloth. This
Fig. 2-6. Dial pointer installation (1) prevents it from accumulating conduc-
| tive dust particles that might eventually
cause a short. |
pointer
MEA | EL = 2-7. VOLUME CONTROL REPLACEMENT
B3x8 self-tapping
' Clan transistor oe | I. Remove the power amp/power supply board by
removing the two nylon rivets.
>
Remove the power amp circuit board bracket (C)
located near the front subchassis by removing the
screw shown in Fig. 2-11.
3. Remove the front panel as described in Procedure
Fig. 2-8. Power transistor replacement 4. Remove the nut securing the VOLUME control
LG Fü /STOr 7e nent , 4 .
me © to the front subchassis shown in Fig. 2-10.
2-5. DIAL GLASS REMOVAL (continued to Page 12)
I. Remove the front panel ass y. |
Pr
ол >
. Remove the five screws shown in Fig, 2-9. AT
This frees the dial glass. — У В 3х 6,
; BSW 3x70 fs |= self-tapping >,
LTO x 70 > SSA |
| PORN VE A |
| | Ny - |
x | =r power amp/power
N .. supply board bracket (€)
* » N
Fig. 2-9. Dial glass removal >
2-6. METER REPLACEMENT
| 1. Remove the meter lamp shade by removing the
i two Screws shown in Fig. 2-2.
| 2. Carefully remove the defective meter from the |
4 front subchassis and install a new one.
| Fig. 2-11. VOLUME contro) replacement
| | ТОМЕ | |
| contro fF] BASS} TREBLE] |
| = TT | ГЕИ т TER | MODE] | FUNCTION |
| | sw | SW |
' Do
| fal scale a 2 ae dial scale |
| em | E Le | ADU RO neta CR В ; removal |
ен KOST
| VOLUME RO
A x 6
control mer
| POWER}——
|5 AUX jack
a
Pob Г
| | | | ——————1 69 control board bracket |
| MUTI | HH. —
HEADPHONE | MUTIN 6 wi ed | MONITOR]
| jack > 3 À J | SA ‘tch )
B3x6 | mes
removal
nette a are tte rt ste À
|
| i
| front subchassis |
| |
Lo i
Fig. 2-10. Control, jack and switch replacement (1)
феей
E
]
!
| STR-7055
5 Remove the loudness control board along with the
VOLUME control.
6. Cut each lug of the defective control on the board.
7 Unsolder and remove the clipped lugs, and clean
out the holes in the printed circuit board.
8. Install a new one.
2.8. CONTROL, JACK AND SWITCH
REPLACEMENT
Prepare for replacing any of the controls, jacks
or switches by removing the front panel described in
Procedure 2-2.
Note: Before removing the front subchassis,
fasten the dial cord to the drum, pulleys
with cellophane tape. This helps you to
restring the dail cord.
POWER Switch, HEADPHONE, AUX Jacks
1. Remove the two screws securing the defective
switch or jack to the front subchassis as shown
in Fig. 2-10.
2. Remove the switch or jack, and unsolder its leads.
3. Install a new one.
SPEAKER, FILTER, MODE and
FUNCTION Switches
1. Remove the retaining ring securing the defective
switch, located at the back side of control board
bracket, as shown in Fig. 2-12.
7 Pull out the shaft of the defective switch with a
screwdriver as shown in Fig. 2-13.
retaining ring,
5 mm dia
contro!
board bracket
Fig. 2-12. Control board removal
3. Remove the bottom plate as described in Procedure
2-1.
4, With a soldering iron having a solder-sucking tip,
clean the solder from each lug of the defective
switch and the printed circuit board.
5. Remove the switch and install a new one.
Fig. 2-13. Switch shaft removal |
LOUDNESS, MUTING Switches and
TONE controls
1. Remove the four screws (B 3 x 6) securing the
control board bracket to the subchassis as shown
in Fig. 2-10.
2. Remove the three screws (PSW 3 x 6) securing the
control board to the chassis as shown in Fig. 2-1 4.
3. Remove the nut securing the defective control or
two screws (B 3 x 6) securing the defective switch
to the control board bracket as shown in Fig. 2-10.
4. Remove the bottom plate as described in Procedure
2-1.
5. Move the control board in the direction of the
power transformer as far as it goes. This helps in
unsoldering the defective part on the board.
6. With a soldering iron having a solder-sucking tip,
clean the solder from each lug of the defective
part and the printed circuit board.
7. Remove the defective part and install a new ore.
PSW3x 6
control board.
2.9. CHASSIS LAYOUT
a-m front-end/
i-f amp /MPX
board — 55
fm front-end
(FAF-0228BWG/
Fig. 2-14. Control, jack and switch replacement (2)
control board
{CCB-116) power transformer
power transistor
a-m bar antenna
og,
foudnes:
_ con tro!
board
powerarnp/
powerseipply
board
STR-7055 MU
SECTION 3
ALIGNMENT AND ADJUSTMENTS
3-1. FM I-F STRIP ALIGNMENT
CAUTION
The ceramic filters in the fm i-f circuit are
selected according to their specified center
frequencies and color coded as shown in Fig.
3-1, and listed in Table 3-1. Check the color
code of the filters to identify the same center
frequency when replacing any of these filters.
TABLE 3-1.
FM 1-Е CERAMIC FILTERS
Part No. Color Specified Center Freq.
1-527-507-11 red 10.70 MHz
1-527-507-21 black 10.66 MHz
1-527-507-31 | white 10.74 MHz
1-527-507-41 green 10.62 MHz
1-527-507-51 yellow 10.78 MHz
color dot ———
Fig. 3-1. Fm i-f ceramic filter
Note: Fm if strip alignment should be per-
formed only after replacing IFT101 in
the front-end.
Test Equipment Required
1. Fm signal generator
Ac VIVM
Oscilloscope
ED
. Alignment tools
5. Headphone
Preparation
1. Remove the shield case.
2. Connect the test equipment and a headphone as
shown in Fig. 3-4.
3. Short the test point of R226 (AFC circuit) on the
a-m front-end/i-f amp/MPX board to ground as
shown in Fig. 3-2.
Component side C217
220/16 v
TT, pan
pur
—————. > To ground
Fig. 3-2. [Interruption of afc circuit
Note: This alignment is needed only after
IFT101 in the front-end, rf trimmer
capacitors (CT102, CT103), or T20l
(discriminator transformer) has been
replaced or repaired.
All signal generator output levels speci-
fied in the fm section are for terminated
output.
Procedure
1. With the test equipment connected as shown in
Fig. 3-4, set the signal-generator controls as follows:
Carrier frequency . . . . . 98 MHz
Modulation ......... Fm, 400 Hz, 100 %
(75 kHz deviation)
Outputlevel......... 30 uV (30 dB)
2. Set the receiver controls as follows:
FUNCTION switch .... FM
VOLUME control . . . . . Minimum
MUTING switch . . . . . . OFF
fm osc trimmer
CT104
fm osc coil
L104
fm IFT101
Fig. 3-3. Adjustment parts location
—14—
STR-7055
3. Turn the core of fm i-f transformer IFT101 (See
Fig. 3-3) and the bottom core (primary side) of
discriminator transformer T201 (See Fig. 3-10) to
obtain maximum output with the alignment tool.
3-2. FM DISCRIMINATOR ALIGNMENT
Note: There are two or three methods of
discriminator alignment, but only the
simplified method using the tuner TUN-
ING meter is described here.
Test Equipment Required
1. Oscilloscope
2. Alignment tools
3. Headphone
oscilloscope
HEADPHONE
REC OUT У
(1904)
STR-7055 CL.
Fig. 3-5. Discriminator alignment test setup
Preparation
1. Remove the shield case.
2. Connect the input cable of the oscilloscope to
REC OUT jack (J904) as shown in Fig. 3-5.
3. Short the test point of R226 (AFC circuit) on the
a-m front-end/i-f amp/MPX board to ground as
shown in Fig. 3-2.
Procedure
1. With the test equipment connected as shown in
Fig. 3-4, set the receiver controls as follows:
FUNCTION switch .... FM
VOLUME control ..... Minimum
MUTING switch ...... OFF
2. Tune the receiver to a vacant spot in the band (no
signal input). Listen to the headphone and watch
the oscilloscope to confirm that the receiver ís not
receiving any off-the-air signal.
3. Turn the top core (secondary side) of discriminator
transformer T201 (See Fig. 3-10) to obtain a null-
point reading on the TUNING meter with the
alignment tool. If the discriminator transformer
T201 is not aligned correctly, some deviation on
the TUNING meter will be observed.
Note: Turn the core carefully and slowly.
At both extreme positions of the top
core, a null point will be observed.
The real null point should be obtained
in the middle of the core thread length.
4. Repeat the above mentioned steps and fm i-f strip
alignment (procedure 3-1) alternately two or three
times.
ac VTVM oscilloscope
ad tem
IN
/ |
HEADPHONE
fm o—o о © о!
signal ANTENNA
generator o: REC our
Do (J904)
STR-7055
V
=
Fig. 3-4. Fm |-f, discriminator, muting and front-end alignment test setup
3-3. FM FREQUENCY COVERAGE
ALIGNMENT
CAUTION
Never attempt alignment of the front-end
section except for the frequency-coverage and
dial-calibration adjustments. The fm front-end
section has been carefully adjusted at the
factory, so very little adjustment is necessary
in the field. Alignment need not be performed
when the front-end FET is replaced since
changes in FET parameters have little effect
Upon tuning. If an rf-stage adjustment is re-
quired, ask your nearest SONY Service Station
to send your unit to the Factory Service Center
for a complete front-end alignment. Exercise
caution when returning the faulty unit so that
it is not damaged in transit. The warranty will
NOt cover damage incurrent in transit to the
Factory Service Center.
Note: Before starting this alignment, the dis-
criminator alignment should be per-
formed.
Signal Generator Method
Test Equipment Required
1. Fm signal generator
2. Ac VTVM
3. Alignment tools
Preparation
1. Short the test point of R226 (AFC circuit) to
ground as shown in Fig. 3-2.
2. Connect the test equipment as shown in Fig. 3-4.
3. Set the receiver controis as follows:
FUNCTION switch .. FM
VOLUME control . . | .. Minimum
Procedure
Follow the procedures given in Table 3-2 when
performing this alignment with an fm signal gener-
ator. Be sure that the dial is mechanically calibrated
as described in Procedure 2-3 on page 9.
Off-the-Air Signal Method
An accurate dial calibration and a frequency-
coverage alignment can also be performed by utilizing
off-the-air local fm signals. However, before per-
forming the following procedure, be sure that the
dial pointer is correctly positioned as described in
Procedure 2-3 on page 9.
Procedure
1. Tune the receiver to the lowest-frequency station
in your locality.
2. Check the dia] scale for a calibration accuracy of
+ 100 kHz from the carrier frequency of the
station. If the dial-accuracy deviation exceeds this
limit, adjust the local-oscillator coil L104 (See
Fig. 3-3) slightly until optimum dial calibration
is obtained.
3. Tune the receiver to the highest-frequency station
in your locality. If the dial-calibration error is
excessive, adjust local-oscillator trimmer CT104
(See Fig. 3-3) to obtain maximum calibration
accuracy
3-4. FM STEREO SEPARATION ADJUSTMENT
Test Equipment Required
1. Fm stereo signal generator
2. AC VTVM
3. Oscilloscope
TABLE 3-2 FM FREQUENCY COVERAGE ALIGNMENT
| SG Frequency | VTVM |
| Coupling Between and Ac | _ ue
Step Receiver and SG Output Level Indication | Connection Adjust Indication
| (terminated) |
87.5 MHz
400 Hz OSC coil
1. 30 % Mod. 87.5 MHz L104
Output level See Fig. 3-3 Maximum
as low as possible REC OUT VTVM
Direct (J904)
108 MHz | reading
, 400 Hz OSC trimmer
2. 30 % Mod. CT104 —
Output level See Fig. 3-3
as low as possible - |
STR-705!
ac VTVM oscilloscope
STR-7055
ee | / || | GA
] OUT (L) Is
fm © —OANTENNA | © o
Sores OUT | mec Or mo | |
generator © 0 OUT (R) o о
J L J — —
77
Fig. 3-6. Fm stereo separation adjustment test setup
Preparation
1. Remove the shield case.
2. Connect the test equipment as shown in Fig. 3-6,
then set the fm stereo signal generator controls
as follows:
Carrier frequency ..... 98 MHz
Output level ........ 1,000 uV (60 dB)
Mode ............. Stereo
67.5 kHz (90 %)
7.5 kHz (10 %)
Audio (400 Hz) Mod .. .
Pilot (19 kHz) Mod .. ..
Note: 75 kHz (100 %) if the metering indicates
total modulation (audio-pilot).
3. Set the receiver controls as follows:
FUNCTION switch .. .. FM
VOLUME control! ..... Minimum
Procedure |
I. Precisely tune the receiver to the carrier frequency
of stereo signal generator, then turn the top core
of switching transformer T301 (See Fig. 3-10) to
obtain maximum output at the left channel. Note
that this adjustment has a close relationship with
stereo distortion.
2. Record the output level of the left channel when
the stereo signal generator input selector is set to
the left channel.
3. Switch the stereo signal generator input selector
to the right channel and read the residual signal
level in the left channel.
4. The output-level to residual-level ratio represents
the separation. Adjust separation adj. control
RT301 (See Fig. 3-10) for minimum residual level.
Check the right channel for separation. Usually,
about an 8 to 9 dB difference in channel separation
exists. Readjust RT301 for minimum difference
between left- and right-channel separation. While
doing this, remember that the output level also
changes according to the setting of RT301.
— 1 7—
3-5. MUTING ADJUSTMENT
Note: Readjustment is necessary after replacing
Q204 (FET) or if the muting point upon
TUNING meter deflection is not sym-
metrical when detuning higher or lower
than the reference carrier frequency.
Two methods of muting adjustment are
available, signal generator adjustment and
adjustment by using an off-the-air signal.
You can use either of them.
Signal Generator Method
Test Equipment Required
1. Fm signal generator
2. Ac VT'VM or oscilloscope
3. Screwdriver with 3 mm (Vs "') blade
Preparation
1. Remove the shield case.
2. Short the test point of R226 (AFC circuit) on the
a-m front-end/i-f amp/MPX board to ground as
shown in Fig. 3-2.
3. With the test equipment connected as shown in
Fig. 3-4, set the signal generator controls as fol lows:
Carrier frequency ..... 98 MHz
Modulation ......... Fm, 400 Hz, 30 %
(22.5 kHz deviation)
Output level ........ 1,000 uV (60 dB)
4. Set the receiver controls as follows:
FUNCTION switch .... FM
MUTING switch. ...... ON
VOLUME control ..... Minimum
Procedure
1. Turn RT201 (See Fig. 3-10) fully clockwise.
2. Follow the procedure given in Table 3-3. Tur e the
receiver to the SG frequency, then adjust T202
STR-7055
TABLE 3-3 MUTING ADJUSTMENT
. SG Frequency Receiver
Coupling Between and Dial Adjust Remarks
Output Level Indication
98 MHz
Direct 400 Hz 98 MHz ; T202 Turn T202 to obtain pro-
30 % Mod. . See Fig. 3-10. per muting operation.
1,000 uV (60 dB)
(See Fig. 3-10) for proper muting operation. Signal Generator Method
Muting should begin at point equidistant from |
zero center. - Test Equipment Required
1. A-m signal generator
Off-the-Air Signal Method
_ 2. Loop antenna
Accurate muting circuit adjustment can also be
performed by utilizing an off-the-air local fm signal 3. Ac VTVM or oscilloscope
instead of the fm signal generator. |
Procedure
3-6. А-М 1-Е STRIP ALIGNMENT With the test equipment connected as shown in
| | Fig. 3-7, follow the procedures given in Table 3-4
Note: The i-f transformers (CFT401 and T402) when performing this alignment with an a-m signal
in the a-m i-f amplifier circuit are adjust- generator.
edat the factory, so very little adjustment
is necessary in the field even if replacing Off-the-Air Signal Method
any of these i-f transformers.
An accurate frequency-coverage and tracking
3-7. A-M FREQUENCY COVERAGE AND alignment can also be performed by utilizing off-t he-air
TRACKING ALIGNMENT local a-m signals.
Preparation
1. Connect the test equipment as shown in Fig. 3-7.
2. Set the receiver controls as follows:
FUNCTION switch .... AM
VOLUME control ..... Minimum
loop ac VTVM oscilloscope
antenna
STR-7055 | /
REC OUT y! So o
am (J904)
signal IN у
generator Oo O— -0
Fig. 3-7. A-m frequency coverage and tracking alignment test setup
TABLE 3-4. A\M FREQUENCY COVERAGE AND TRACKING ALIGNMENT
A-M FREQUENCY COVERAGE ALIGNMENT SC Coupling
... Loop Antenna
SG Output Level. . 400 Hz, 30 % (as low as possible)
A-M TRACKING ALIGNMENT
i TVM Le
Ste Receiver Ac V :
p SG Frequency Dial Indication Connection Adjust Indication
| OSC coil T401
, 550
! kHz 350 kHz See Fig. 3-10. | Maximum
REC OUT VTVM
2, 1,600 kHz 1,600 kHz (J904) OSC trimmer CT402 reading
See Fig. 3-10.
SG Coupling Loop Antenna
SG Output Level. . 400 Hz, 30 % (as low as possible)
Bar antenna coil
1. 600 kH i
a Tune to the 1.901 Maximum
SG signal REC OUT y VTVM
5 1.400 kHz (J904) Antenna trimmer CT401 reading
See Fig. 3-10.
3-8. TUNING METER CALIBRATION
| /
Test Equipment Required antenna
1. A-m signal generator un
2. Loop antenna STR-7055
3. Alignment tools a-m
signal ]
, generator @
Preparation
1. Remove the shield case.
: On Fig. 3-8. Tuning meter calibration test setup
2. Connect the test equipment as shown in Fig. 3-8.
3. Set the a-m signal generator controls as follows:
1 3 rr:
Carrier frequency . . . .. 1,000 kHz | mm (764 )
Output level... ...... 104 dB/m at AM TUNING
| antenna AM =~
Modulation (400 Hz). .. 30% FM
4. Set the receiver controls as follows: as
VOLUME control . . . . . Minimum Fig. 3-9. TUNING meter calibration
FUNCTION switch .... AM
MODE switch. ....... MONO
MONITOR switch... SOURCE |
Procedure
Precisely tune the receiver to the signal and
adjust RT401 (See Fig. 3-10) to obtain the meter
pointer within 1 mm (%a”) left of its maximum
indication as shown in Fig. 3-9.
Adjustment Parts Location
A-m Front-End/I-f Amplifier/MPX Board
— Component Side —
rear panel side
SX ( её Vorlage vorhauden )
S10 7307
(switching transformer)
o 1C-301 D
CFT401
{а-т
CT401
ant trimmer)
RT201 ]
? muting
! gir ting (transformer!
1c-201 Fo
T201 (discriminator transformer)
front panel side
Fig. 3-10. Adjustment parts location
1C-401 O)
RT301
MUJO1 (separation adj.)
e 7402 (m
CT402
RT401 fa-m osc trimmer)
D ftuning meter
O calibration) A
7202
7401
{a-m osc coil)
3-9. POWER AMPLIFIER ADJUSTMENT
Dc Bias Adjustment
Serious deficiencies in performance, such as
thermal runaway of power transistors, will result if
this adjustment is improperly made.
CAUTION
To avoid accidental power transistor damage,
increase the ac line voltage gradually, using a
variable transformer.
Test Equipment Required
1. Dc millivoltmeter
2. Variable transformer
3. Screwdriver, 3 mm (/3'') blade
Preparation
|. Remove the shield case.
2. Connect the de millivoltmeter across the test
points as shown in Fig. 3-11.
3. Turn the adjustable resistors RT701 and RT751
on the power amp/power supply board fully
counterclockwise as shown in Fig. 3-11.
4. Set the variable transformer for minimum output.
Procedure
|. Turn on POWER switch, and increase the line
voltage up to the rated value (120 V).
2. Allow about five minutes for warm-up.
3. Adjust RT701 (RT751) for 50 mV reading on the
meter. |
__ ----2
De millivoltmeter
RT751
E
у
WHT/RED WHT/VLT
Г
0 / 0
VLT
Fo 777
Dc millivoltmeter
power amp/
power supply
board
RED
T
A.
Fig. 3- 7 1. Power amplifier adjustment test setup
| STR-7055
SECTION 4
REPACKING
The STR-7055 original shipping carton and the STR-7055 must be repacked in these materials
packing materials are the ideal containers for shipping precisely as before. The proper repacking procedures
the unit. However to secure the maximum protection, are shown in Fig. 4-1.
3-701-020-00
bag, polyethylene; instruction manual
1-506-138-11
/ plug, phono (red)
/ 1-506-138-12
plug, phono (white)
1-506-191-00
plug, binaural
X-44900-02-0
cloth ass’y, polishing
НИ 3-780-173-11
, manual, instruction
3-733-587-00
schematic diagram
1-507-083-2171
ribbon antenna, frm
TT 4.822-360-00
cushion, upper
Te #-822-363-00 *
~~" cushion, side
>
>
4-826-435-00
sheet, protection
4-822-218-00
carton
Fig. 4-1. Repacking
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5-4. MOUNTING DIAGRAM — A-m Front-End/I-f Amplifier/MPX Board —
— Conductor Side — |
MODE SW
S4-3-1
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2SC403C
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To terminal strip, BLK To control
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board, S9
7854321
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a Ao 50 WHT/ORG To control
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To control board, To control To tm front-end To control To contro! board,
0807 (E) board, S1-1-1(7) board, R109 . board, Q806 (E) 0806 (C)
; Parts Location
Q201 0202 0203 0204 | 0205 0206 303
{ 0204 05 D203 202 D206
;‘ ; D201
CT401 CFT401 T301 | RT201
ADJ T401 T402 RT 301 T2702 - | T201
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e: e da ©
5-6. SCHEMATIC DIAGRAM — Audio Amplifier Section —
section
To a-m front-end/
if amp/MPX section
MONITOR
MONITOR
FUNCTION sw Sw-1 Sw-2
MODE SW,
52-1 S4-1-1. 84-2-1.
us —
16501
CX-0461
TAPE-—— [SOURCE]
TAPE
To am front-end/
if amp/MPX section
= 7
o LEFT
RIGHT
To a-m front-end/.
i-f amp/MPX section
Tos a-m front- and/.
if ET amp/MPX section
REVERSE
agen
E
PHONO
954
AUX
4952
TAPE-1 |
J953
REC OUT 1 /
“1954
51-1-2
ВЕС E
C559 0.001:
=
8
a
50K(8)
\
7
‚ 9803, 0804 -
-25C634A:
- IMUTING):
9603, 0653 eu
PL904
Г @701 07020703
2SA678 — 2SA705
“(REGULATOR} (Pangrtrase
I VY
9307 -
\ PREAMP OUT
{MUTING)
0704
2SC634A
[DC BIAS) +
0705. Q708. .Q709 . Q710
‚ 25С1124 2SC634A 254678 ,25C633A
— (PREDRIVER)
‚(SPEAKER PROTECT
0702-0704 -
e SH-18
ceo.
0,022/200V
‘0706 Q902
scie, 254706 ascos ans
POWER. AMP): -
CP 901
1200+0033u
D803-D806
E
(RECTIFIER)
Q751 “ars, Q753
2SA678 |
. 2SATOS |
0754 Q755
EX 2sc1124
0787 0881. 9952
ita 2SA706
Q9
2501408 25A745
Note:
Ref. No.
$21~2
(SOURCE — TAPE)
S3-1-2 MONITOR-2 switch
(SOURCE ~ TAPE)
S4-1~3 MODE switch
[REVERSE — STEREO — (L + R) -
o LEFT - RIGHT] _
$5-1~2 LOUDNESS switch ON
S6-1~2 FILTER switch - OFF
В (LOW — OFF — HIGH — BOTH)
$7-1~2 NORMAL/SEPARATE switch -
$81~2
HEADPHONE. :
SPEAKER °
TERMINAL
Lo Lor
“FUNCTION switch В
[AUX = PHONO — FM — AM
(TAPE PRINT ls 2) - — (TAPE
RIN
MONITOR-1 switch |
5 SPEAKER switch. ~~.
[C— B— OFF — A-(A+B)—
(A+O)]
POWER switch
Description
ic BLOCK DIAG RAM
Position
SOURCE
SOURCE
STEREO
NORMAL
1C501. 551
1C601, 651.
| input
feedback input t
+ phase compensation
80
©
Ny
input
"+ phase compensation input
feedback
input
CNE PERS ie me
All resistance values are in ohms.
All capacitance values are in UF except as indicated with p.
which means ULF.
1000, M
Detailed IC (CX-0461) diagram
1000 k.
All voltages are dc measured with a VOM which has an input
impedance of 20 k ohms/volt. No signal in
All voltages represent an average value,
à
a
’
>
AR I$ BRULEE XT WW RR a Вол
HOT a we be eset Toe
4
x
a
=;
La
x
X
<
+
,
я
sure
LEER
+
1
38
С
=
<
©
8
©
=
<
©
2
>
|
m front-end/
F amp/MP
H
CNJ9C4
С
To AUX
=
©
<=
@
=
o
o
o
><
a
=
e a-mfront-
1-f amp/
buard
doard,
R331
Toa
ower amp board
3806
38
To a-m frontend/
i-f amp/MPX
To power amp
R402
9802 (E)
R212
3247
jack
To PHONG
|
J851
BRN
To a-m front-end/
i-f amp/MPX board
R418
To loudness control board
ground
AVEC!
AVESI
R248
To a-m front-end/
+f amp/MPX board
y
A249
R652
C651
R651
|
To loudness
control board
WHT/GRN
C322 (-)
To a-m front-end/
To power amp
board, R832
i-f amp/MPX board
372 (-)
To power amp
board, 1751
To power amp board,
ORG
To SP terminal
R8
To power amp
L701
board,
(CCB-116)
To SP terminal
To C902 (-)
ground
WHT/VLT
WHT/ORG
WHT/YEL
BLK
To loudness contre!
board
MOUNTING DIAGRAM — Control Board —
— Conductor Side —
)
AVES?
(
Right {=}
To £902 (~)
(С)
(8)
Rignt (-)
Left (-)
To SP terminal
4700 y 60 V
To SP terminal
To SP terminal
5-7.
sr side -
= 0823 is mounted on the conduct
(А)
Right (+)
(A)
Left (+)
4700 4 50 V
To FUNCTION SW,
s2RD
Q806 Q807
$7-2
To NORMAL/SEPARATE
D810
S7-1
h
swite
SH-1S
Q653
Q603
Q652
Q602
To loudness
control board
0602
AGO!
CX-0461
7654321
8 91011121314
0805
To power
transformer
T80?
D811
PL902
25A678
PL903 PLSD!
PL904
25C632A
2SC634A
To SP tarminal
(e)
Right (+)
To SP terminal
(B)
Right {+}
0804
Left {+}
D809
To SP terminal
To SP terminai
(8)
Left (+)
Q601
Q651
Q803
D808
Ta SP terminal
Left (-)
Parts Location
{Top view)
i
STR-7055
25CE34A
25A678
2SA705
2501124
25A745
To power transistor,
lo
D901
2902 (B)
@ 0902 (Е)
To thermal compensator,
To power
transistor,
To contro!
board,
$8-1-2
La
|
25A 706
2SC1403
power transistor
To
Q901 (B)
RN
SH:1S
VD-122 1
cathode
anode
anode
anode
UO-5E
SV-31
cathode
cathode
—
RN
CNJ902
HEADPHONE
1T243M
‘
input jack
J908
GRY To power amp
GRY
har RED |
| |
To power
|
©
ei
O
ед
>
Q
e
=
A
he
©
=
O
a.
=
2
=
E
<
D
5
O
[2
|
=
<q
ec
©
<
Q
©
=
>
2
>
O
=
— Conductor Side —
5-8.
em
om
25
Ein
so
=.
=
—
со
o
m
=
=
=
с
Oo)
eo
oo
HO
To power
transformer
To control
transistor,
To power
To thermal compensator,
D951
To C901 (-)
4700 y 50 V
(anode)
i
(
=)
ov
To C802
470045
ister,
To power trars
)
0951 (8
jur
WHT/ BLU
To control board, R812
BLK
2
RED
—Mpo———]——]]—]
,
famp/
MPX board,
ground
To control board,
0806 (C)
j-
To a-m front
-end/
@
©
©
To control board,
|
To power
transformer
T801
BRN
ower amp input
Top
k, J958
jac
VLT
mm
FA ERICA
ETA
EE AEE
as
SU
cathode
anoge
— 3 4 —
0702 @7
0701 "7 a705
D703
RT701
Q704 Q703
Q706
D702
D704
D701
Q709
Q710
D752
D754
D751
Q756
Q753 0754
0757 0752
0755 0751
D753
RT751
Voltage Selector
Q802
D807
— 33 —
Q801
D805
D806
D802 D801
D804
D803
Parts Location
ADJ
ESB NO
i
wad a
"a
EA
EE)
EA
A, Pal
x
5,
AA
A
7
A i
7685-546-23
83x 8, self tapping _
2-043-749-05
case, shield
|
SECTION 6
EXPLODED VIEWS
J À
\
; X
J
4
/ 7-685-546-25
/ 53x68, saif-tapping
/
7-685-545-21
B 3 x 8, seif-tapping
—35—
Note:
— Hardware Nomenclature --
— PanHeadScrew.... | © =
— Pan Head Screw
with Spring Washer ........ ©) d=
— Flat Countersunk Head Screw © p=
В - Binding Head Screw ___. © E
SC - SetScrew o... e I
E — Retaining Ring (E Washer)...... CC
W — Washer
SW — Spring Washer
LW — Lock Washer
N - Nut
— Example —
f
Type of Slot
® РЗх10 _
| Length in mm (L) I г
| Diameter in mm (D) |, || |
Type of Head mi O
STR-7055
x
4-822-338-00
piate, bottom
2-066-107-00
screw, top cover
0-G51-263-00
foot, rubber
7-685-546-23
В 3 x 8, self-tapping
All screws in this service manual are Phillips
type (cross recess type) unless otherwise indi-
cated. (—): slotted head.
4-822-344-00
terminal post (D)
____1-536-353-00
terminal past, U-shaped (single)
1-536-355-00
terminal post, U-shaped (double) —
4803-957-00
e —— terminal post (A)
1-536-354-00
‘terminal post {0}
4-809-248-00
— terminal post (8)
X-48223-07-0
knob ass’y, BALANCE
. x,
\
%
X-48223-08-0
knob ass'y, VOLUME
х-20472-09-0
knob ass'y, POWER
N 5
= Pe
>
X-48030-04-0 e
knab ass'y, SPEAKER ~~
x
X-480
a . TONE {L-CH) у
knob 55),
/ и
X-48222-01-0
subehassis ass'y, front
4-803-055-00
cushion, dial glass
4822-33700
escutcheon, dial scale
>
. >
4-822-351-00
glass, dial —
4-822-356-00
hoider (AJ, dial glass
x
у > >
-48030.07-0 — De E ANN " | | e , mA
knob ess'y, TONE (R-CH)— / NA SH set screw, © M4 x 8
X-48030-04-0 7
knob ass’y, FILTER
X-20472-09-0 í iB
knob ast’y, LOUDNESS, MUTING
X-48030-04-0 , - В
knob ass’y, MODE, FUNCTION „ и
7 >”
= и
at... 1 Х-48223-09.0 „ р
! knob ass‘y, TUNING и”
- и
X-20472-090 #
knob assy, MONITOR"
/
7-685-546-2
—
7682-94701
PSWIxE
7
>
7-682-547-01
BIx56
482221400 7
holder (C}, dial glass
Y
> 2-047-106-00
fight shield (A)
4-822-219-00
— panel, front
E - a
8 768266001
= he, PSAxE6
/ >
/ . 2-043-776-00
bracket, front panel
3
B 3 x 8, self-tapping
me.
Tree 4822-343-00
cushion, dial scale
(2)
A
=
В
i
ы | |
o
U
ui
X48222-240
1-224-102-17
4-822-345-00
bracket, dial lamp holder —.
Te
4-818-044-00 Ts
reflector (B) =
4-818.
-045-00 С
lighs shield 18) ~___
—
1-543.
holder, dial lamp =
7621-55945
K26x§&
— |
1-518-116-00
famp, dial — ff
4-822-333.00
cushion, dial scale >
7-682-647-01
PSIxE >
4518-
3439-00
holder, dial scale —
4-822- 206-00
scale, dial
complete circuit board, foudness control
resistor, variable: 250
MOLUME/BALANCE,
7-662-647-01
PSIxE
(€)
1:517-058-00
4-5 18-044-00
holder, meter lamp reflactor (B)
#-533-090-00 yey
7-682-545-05 haider, dial lamp PEE 7-07
B3x4
7-621-55845
4822-211-00 K26x6
shade, meter тр
- 1-518-116.00
tamp, dial
1-520- 154-00 p, dé
4-822-346-00
meter, TUNING
hracket, dial {amp holder
eee. 1-5715-3715-00
switch, lever (POWER)
1-518-124-00
lamp, TUNING meter
7682-14707
sat screw, PI x 6
- 4-8 18-045-00
1-507-265-00 — ‚ A A or wo 4818.04.00
jack, HEADPH - -
jack, HEADPHONE » 754.0
mn
Во 1-5 18- 181-00
2-057-730-00 pointer {with lamp)
pulley, dial cord 7.682-647-01 _
PSIxE6
4-815-103-00
clamp {F}, lead wire -5 mm dia
~~ 4-822-347-00
shaft, tuning
7682-6471
SIX
7682-647-01
PSIx6
5-398-00
terminal strip 20. 2C
1-518-153-00
lamp, STEREO
~_2057-730-00
pulley, dial cord
4-818-032-00
washer, nylon
X-48223-03-0
bracket est'y, dial cord pulley
X-48223.02-0
u tor ass’y, dial scale
- F442-022-00
grommet, тр
4.822.348 DO
bracket, ftywheei
7-684-023-0171
а nut, 3 mm dia
r Tres
7-623-208-22
>= washer, spring; 3 mm dia
1-507-170-00
fack, AUX
=
4810-422-00
— excutcheon, AUX jack
7-502-6547-01
PSIxE6
X-48222.01.0
subchassis ass’y, front
7-682-5472-01 X-48080-07-0
BIx6 7-682-547-01 iluminaror ass'y, STEREO
BIx6
4822-333-00
cushion, dial scale
Note: A 1 flywheel ass'y (X-20437-54-0) includes
the part marked &
m ETE
ERE
Cpu Bh
5, auras wd EAL LRH
7-682-547-01
2-056-666-00 X-45222-21-2 BIxE6
clamp (C), lead wire; 8 mm dia complete circuit board,
power amplifier/power supply 7-582-54701
7-682-548-03 83x6
B3x8 4-822-358-00 a
bracket (DJ, printed circuit board E
(7
> >.
7-684-023-00 >. _
nut, 3 mm dia 7
451504600_—— < f 4-822-341-00
heat sink (B} O В caver, fm front-end
1-535-055-00 | À
lug terminal (B) <b 7682-54701
——————— Bx 6
1-535-054-00
I lug terminal (A) 8-982-730-11 4-822-345-00
. fm front-end drum, tuning
4-812-134-00 2001-70705. —
rivet, nylon (3.5 mm dia x 5.5 mm) 7-685-545-21 | clamp (B), lead wire 4-809-050-00
3 x §, self-tapping spring, tension
4-822-364-
822-364-00 7-623-616-01
finer, lead-wire protection,
4-303-820-00
clamp (Е). lead wire
x 1
4-822-352-00
plate, connection
>
3-701-454-00
clamp (0}, lead wire
4-822-354-00
bracket {CC}, printed circuit board
7-682-947-01,
PSW3x6 |!
1-516-198-
DO
switch, rotary/slide {SPEAKER} 7-665-545-21
В 3 x 6, self-tapping
3
O E 1-5 14-448
-00 a. ;
switch, slide (DE-EMPHASIS} D 7
FD
La
4-824-701-00
bracket, control board
е 7-682-947-01
(a, PSW 3 x 6
e Y < к. S к
ROP 1-516-197-00 ©
<
> N 0
> N switch, rotary/slide (FIL TER) =
— >» es Y
1-516-096-00 >. e
E switch, lever (LL QUD 1
oy
7-624-109-01
retaining ring, 5 mm dia
1-516-252-00
switch, rotary /slide {FUNCTION}
^^
1.516-036-00
1224-10 1-11 Ш
resistor, variable :50 k (8B) (TONE) A :
rr
7-682-147-01
P3x6
>
>
и /
76821470 /
3x6 J
1624-10301 Ра
retaining ring, 5 mm dia
__ 4-804-157-00
clamp, lead wire
X-48266-21-0
complete circuit board, contro! (CCB-116)
7-682-147-01 N
B3x6 1-516-196-00 7-682-147-01
switch, rotary/stide {MODE} PIxE
7-623-108-127
washer, 3 mm día 7-682-647-01
eyelet, 2 mm x 3 mm
7-623-207-22
spring washer, 2.6 mm dia
7-621-773-65
B26x4
TT ASIXÉ
A 7-585-545-21
- ——— 8 3x6, self-1apping
_— 2.056-635-00
поте pracket (8B), tuning capacitor
4-822.340-00
x — bracket (AJ, tuning capacitor
7-685-545-71
re BIR6, self-tapping
—__7685-546-23
“E B3Ix8, self-tapping
> 4822-336-00
stopper, lead wire
————————— X-48272301-0
chassis ass y
— X48222-22.0
complete circuit board.
a-m frant-end/i-f amp; MPX
7-682-947-01
PSWIXE
SSOZ-YLS
(5)
4.822-216-00
panel, rear
-
| CC
\
1-536-415-00
screw terminal strip (SPEAKER)
—4-803-054-00
screw (A), voltage selector cover
4-812-134-00
rivet, nylon (3.5 mm dia x 5.5 mm)
1-401-558-21
bar antenna, a-m
7-682-649-03
PS 3x 10
097 151-00
band, a-m bar antanna
a
ро
- rd <
7 e E
7,682 147-00 — IN:
x nut-plate, am bar antenna
7-682-147-00 Оо 4822-35611 > 7-682-649-03
x6, Pa cover, voltage selector PS Ix 10
A0 \ "> X-20437-13-0
4822-217-00 holder ass’y, a-m bar antenna
plate, ac input se > \ |
connector suppo Say = -803-055-00
| > „screw (8), voltage selector
A0 y = 4-822-203-00
- te label, specification
| ! 17-621-773-65 `
1-536-295-00 | LN |8 2.6х 4 -682-148-05
7-684-023-01 terminal strip, TL 1 ! P3x8
Aut, 3 mm die с 4-8 12-134-00 ‚
вх > rivet, nylon (3.8 mm día x 9.5 mm)
Se > ___7-682-546-25
> Sh >> X Hs J x 8, self-tapping
; RS AN 1-509.617-00
1-509-546.00-— A Sy j connector, ВЕС/РВ
connector, ac 1-536-415-00 y
input; 3- screw terminal strip, 4- (ANTENNA) < X-20680-04-0
terminal ass'y, ground
1-507-393-00 a
rf 8. — — 2-068-008-00
= washer, ground terminal
1-514-524-00 | ° T8 22-334-00
switch, slide (NORMAL/SEPARATE) Mi E clamp. antenna lead wire
1-591-020-00
‚ба 7-623-208-22
; Sa spring washar, 3 mm dia
591-020.00 ~~ > 768254901
printed circuit board, REC/PE connector C6 "7 B3x 10
— me © - Q
1526582011 .——— _
‘ 3.701-589-00
voltage selector o ~D Yep} 3x8, seif-tapping
Ly DD A 7-623-112-11
A ZL) ad washer, 5 mm dia
. O) | ’ 7-623-508-07
Pr ых 3 lug, 3 mm dia
— NS) À} \7-684-023-01
„и и К В
a / a ut, 3 mm día
1-507-393-00 /
fack, phono 8-p 7 !
7 ! _—7-682-546-23
/ | ; 7 8 3 x 8, saif-tapping
1-582-233-00 4822.352.00
jumper board, 8-p phono jack
3 bracker, heat sink
76825484
83x8
Xx 1-509-437-2 |
9 socket, powr transistor
4-82-208- 00
„7 =" heatink {A}
1-442-076-00
7-682-651-01 Ts transformer, power
PSAXE — A 2825-03-00
E = insulator, micas
1 f 4820-42-00
Вс ` e _hoider, viistor
nn — ; A 7
— e ; i
2-066-607-00 alll
washer, power transformer
” 7-623-408-05
washer, 3 mm dia; external Ae 13
SD 7685.546-23
W B 3 x 8, self-tapping
4822-335.00
plate, heat sink support
83x
8, self-tapping
—39—
STR-7055
Ref. No.
Q101
Q102
Q1 03
Q1 04
Q201
Q202
Q203
Q204
Q205
0206
0207
0301
Q302
0303
Q304
Q601(Q651)
Q602(Q652)
Q603(Q653)
Q701(Q751)
Q702(Q752)
Q703(Q753)
Q704(Q754)
Q705(Q755)
Q706(Q756)
Q707(Q757)
Q708
Q709
Q710
Q801
Q802
Q803
Q804
Q805
Q806
Q807
Q901(Q951)
Part No.
SECTION 7
ELECTRICAL PARTS LIST
Description
COMPLETE CIRCUIT BOARDS
8-982-730-11
X-48222-22-0
X-48266-21-0
X-48222-24-0
X-48222-21-2
X-48222-25-0
SEMICONDUCTORS
fm front-end (FAF-022BWG)
a-m front-end/i-f amp/MPX
control (CCB-116)
loudness control
power amp/power supply
REC/PB connector
FET
FET
transistor
transistor
transistor
transistor
transistor
FET
transistor
transistor
FET
transistor
transistor
transistor
transistor
transistor
transistor
transistor
transistor
transistor
transistor
transistor
transistor
transistor
transistor
transistor
- transistor
transistor
transistor
transistor
transistor
transistor
transistor
transistor
transistor
transistor
2SK42
2SK23A
2SC403C
2SC710
2SC403C
2SC403C
2SC403C
2SK23A
2SC633A
2SC633A
2SKR23A
25C631 A
2SC631 A
2SC633A
25C633A
2SC632A
2SC632A
28C634A
2SA678
2SA705
2SA705
2SC634 A
2SC1124
2SC1124
2SA706
2SC634A
2SA678
2SC634 A
28C1124
2SC1124
25C634A
28C634 A
2SA678
2SC634A
2SC634A
2SC1403
- Ref No.
Q902(Q952)
1C201
IC301
‚ 1С401
Part No.
IC501(IC551)
IC601 (IC651)
D101
D102
D201
D202
D203
D204
D205
D206
D701(D751)
D702(D752)
D703(D753)
D704(D754)
D801
D802
D803
D804
D805
D806
D807
D808
D809
D810
D811
D901(D951)
Description
transistor 2SA745
IC CX-0412
IC CX-0431
IC CX-0451
IC CX-0461
IC CX-0461
diode 1S351M
diode 1T243M
diode 1T22A
diode 1T22A
diode 151555
diode 1T22A
diode 1T22A
diode 181555
diode VD-1221
diode SH-1S
diode SH-1S
diode SH-1S
diode 1T243M
diode 1T243M
diode UO-SE
diode UO-SE
diode UO-5E
diode UO-SE
diode - SH-15
diode SH-15
diode 151555
diode SH-15
diode SH-15
diode SV-31
TRANSFORMERS, COILS AND INDUCTORS
Bl
CFT401
IFT101
L101
L102
‚ 1103
1104
1105
1106
L201
1202
L203
L401
L402
1-417-014-21
1-403-150-00
1-403-295-12
1-401-489-00
1-425-446-12
1-425-668-00
1-405-377-00
1-407-184-00
1-407-184-00
1-407-418-00
1-407-163-00
1-407-169-00
1-407-169-00
1-407-169-00
balun
CFT
IFT, fm 10,7 MHz
coil, fm antenna
coil, rfl
coil, rf2
coil, fm osc
inductor, micro 3.3 AE
inductor, micro 3.3 UE
coil, trap; SCA
inductor, micro 33 UH
inductor, micro 100 A!
inductor, micro 100 Al
inductor, micro 100 Al
STR-705:
Ref. No Part No. Description Ref. No. Part No. Description
L701(L751) 1-407-592-00 inductor, micro 1.8 uH C211 1-102-100-11 0.0022 +5% 50V ceramic
L901 1-401-558-21 bar antenna, a-m C212 1-121-651-11 10 16 V electrolytic
MU301 1-464-009-00 MPX unit C213 1-101-118-11 0.01 +20% 50 V ceramic
T201 1-403-291-00 transformer, discriminator 10.7 MHz C214 1-121-651-11 10 16 V electrolytic
T202 1-403-299-00 transformer, muting C215 1-105-677-12 0.022 +10% 50V mylar
T301 1-425-729-00 transformer, switching 38 kHz C216 1-105-689-12 0.22 +10% 50V mylar
T401 1-405-459-00 coil, a-m osc C217 1-123-068-11 220 16 V electrolytic
T402 1-403-128-00 IFT, a-m C218 1-102-977-11 200p +5% 50V ceramic
T801 1-442-076-00 transformer, power C219 1-121-413-11 100 6.3 V electrolytic
C220 1-121-651-11 10 16 V electrolytic
CAPACITORS C221 1-107-140-11 240p +10% 50V silvered mica
| C222 kann
All capacitance values are in UF except as indicated with p, C223 1-131-196-11 2.3 20 V tantalum
which means UUF. C224 1-102-960-11 24p +5% 50V ceramic
C225 1-101-922-11 0.0047 * 30 » 25 V ceramic
C101 1-102-880-11 15p +0.5pF50V ceramic C226 1-101-923-11 0.01 39% 25V ceramic
C102 eel C227 1-105-683-12 0.068 +10% 50V myiar
C103 1-102-880-11 15p +0.5pF 50V ceramic C228 1-121-391-11 1 50 V electrolytic
C104 1-102-064-11 0.75p +10% 50V ceramic C229 1-121-395-11 4.7 25 V electrolytic
C105 1-102-880-11 15p +0.5pF50V ceramic C230 1-121-651-11 10 16 V electrolytic
C106 1-102-848-11 180p +0.5pF 50V ceramic C231 1-127-022-11 0.47 +10% 10V solid aluminum
C107 1-101-923-11 0.01 - 59 % 25 V ceramic C235 1-101-118-11 0.01 +20% 50 V ceramic
C108 1-101-923-11 0.01 159% 25 V ceramic
C109 1-101-923-11 0.01 % 50 % 25V ceramic C301 1-121-402-11 33 10 V electrolytic
C110 1-101-918-11 0.001 “30% 25V ceramic C302 1-121-352-11 47 10 V electrolytic
C111 1-101-924-11 0.022 * 20 % 25 V ceramic C303 1-121-413-11 100 6.3 V electrolytic
C112 1-101-924-11 0.022 * 50 % 25V ceramic C304 1-127-022-11 0.47 10 V solid aluminum
C113 1-101-924-11 0.022 * 30 % 25V ceramic C305 - 1-103-575-11 4,700p+5% 50V styrol
C114 1-101-923-11 . 0.01 + 30 % 25V ceramic C306 1-105-661-12 0.001 10% 50 У myler
C115 1-102-875-11 7p +5% 50V ceramic C307 1-123-068-11 220 16 V electrolytic
С116 1-102-875-11 7p +5% 30V ceramic C321(C371) 1-106-013-12 0.0033 +5% 50V mykr
C117 1-102-986-11 10p +0.5pF 50V ceramic C322(C372) 1-121-912-11 1 50 V electrolytic
C118 1-102-114-11 470p +10% 50V ceramic C323(C373) 1-121-912-11 1 50 V electrolytic
C119 1-101-118-11 0.01 +20% 50V ceramic C324(C374) 1-105-661-12 0.001 +10% 50V mylar
C120 1-102-986-11 10p +0.5рЕ 50 У ceramic C325(C375) 1-102-973-11 100р +5% 50V ceramic
C121 1-101-924-11 0.022 * 50 % 25 V ceramic C326(C376) 1-121-352-11 47 10 V electolytic
C122 1-105-679-12 0.033 +10% 50V mylar C327(C377) 1-121-392-11 3.3 25 V electoiytic
C123 1-121-391-11 1 50 У electrolytic
C1 24 1-101-924-11 0.022 = 50 % 25V ceramic C401 1-105-673-12 0.01 +10% 50V myla
C125 1-101-118-11 0.01 :20% 50V ceramic C402 enanas
C126 1-101-118-11 0.01 *20% 50V ceramic C403 1-102-953-11 18p +25% 25V ceramic
C127 1-102-986-11 10p +0.5pF 50V ceramic C405 1-121-409-11 147 16 V electrolytic
| C406 1-105-677-12 0.022 +10% 50V myla
C201 1-101-118-11 0.01 +20% 50V ceramic C407 1-103-715-11 390р +5% 25V styro
C202 1-101-923-11 0.01 230% 25V ceramic C408 1-101-923-11 0.01 39% 25 М ceramic
C203 1-102-100-11 0.0022 #5% SOV ceramic C409 1-101-923-11 0.01 138% 25V ceramic
C204 1-101-923-11 0.01 -20% 25V ceramic C410 1-105-677-12 0.022 +10% 50V mylar
C205 1-101-118-11 0.01 +20 о 50 У ceramic С411 1-105-669-12 0.0047 +10 % 50 У туй:
C206 1-101-923-11 0.01 7 20 о 25 V ceramic C412 1-101-923-11 0.01 + 30 % 25V cerame
C207 1-101-923-11 0.01 ; 20 о 25 V ceramic C413 1-105-677-12 0.022 +10% 50 V mylar
C208 : 1-101-918-11 0.001 -20% 25V ceramic C414 eae
C209 1-102-977-11 200р +5% 50V ceramic
C210 1-101-924-11 0.022 > 30% 25V ceramic
—41—
E YE
Ref. No.
C415
C416
C417
C418
C419
C420
C421
C422
C423
C424
C425
C426
C427
C428
C501(C551)
C502(C552)
C503(C553)
C504(C554)
C505(C555)
C506(C556)
C507(C557)
C508(C558)
С509(С559)
C601(C651)
C602(C652)
C603(C653)
C604(C654)
C605(C655)
C606(C656)
C607(C657)
C608(C658)
C609(C660)
C610(C660)
C611(C661)
C612(C662)
C613(C663)
C614(C664)
C615(C665)
C616(C666)
C617(C667)
C618(C668)
C619(C669)
C620
C701(C751)
C702(C752)
C703(C753)
С704(С754)
C705(C755)
C706(C756)
C707(C757)
C708(C758)
Part No.
1-102-977-11
1-102-936-11
1-121-651-11
1-121-395-11
1-121-398-11
1-101-923-11
1-105-672-12
1-105-672-12
1-105-672-12
1-101-924-11
1-121-651-11
1-101-924-11
1-105-682-12
1-101-923-11
1-131-206-11
1-121-925-11
1-102-978-11
1-101-880-11
1-106-005-12
1-106-019-12
1-121-911-11
1-105-661-12
1-105-677-12
1-107-137-11
1-131-206-11
1-121-392-11
1-105-679-12
1-105-679-12
1-105-665-12
1-121-398-11
1-121-352-11
1-102-978-11
1-102-978-11
1-102-978-11
1-121-392-11
1-106-023-12
1-106-0] 3-12
1-106-041-12
1-106-031-12
1-121-392-11
1-121-392-11
1-105-671-12
1-121-392-11
1-102-963-11
1-121-413-11
1-102-944-11
1-102-963-11
1-121-392-11
1-123-058-11
1-105-679-12
ceramic
ceramic
electrolytic
electrolytic
electrolytic
ceramic
Description
200p +5% 50V
3p + 0.25 рЕ25 У
10 16 V
4.7 25 V
10 25 V
0.01 “50% 25V
0.0082 +10% 50V
0.0082 +10% 50 V
0.0082 +10 % 50 V
0.022 30% 25V
10 16 V
0.022 558% 25V
0.056 +10% 50V
0.01 130% 25V
3.3 25 V
33 10 V
220р £5% 50V
47p 5% 50V
0.0015 45% 50V
0.0056 +5% SOV
0.47 50 V
0.001 +10% 50 V
0.022 +10% SOV
180p +10% 50V
3.3 25 V
3,3 25 V
0.033 +10% SOV
0.033 +10% 50 V
0.0022 +10 % 50 V
10 25 V
47 10 V
220р +5% 50V
220р +5% 50V
220р +5% 50V
33 25 V
0.0082 +5% 50V
0.0033 +5% 50V
0.047 +5% 50V
0.018 +5% 50V
3.3 25 V
3.3 25 V
0.0068 +10% 50V
3.3 25 V
33p +5% 50Y
100 6.3 V
7p +5% 50V
33p +5% SOV
3,3 25 V
47 50 V
0.033 +10% 50 V
mylar
mylar
mylar
ceramic
electrolytic
ceramic
mylar
ceramic
tantalum
electrolytic
ceramic
ceramic
mylar
mylar
electrolytic
mylar
mylar
silvered mica
tantalum
electrolytic
mylar
mylar
mylar
electrolytic
electrolytic
ceramic
ceramic
ceramic
electrolytic
mylar
mylar
mylar
mylar
electrolytic
electrolytic
mylar
electrolytic
ceramic
electrolytic
ceramic
ceramic
electrolytic
electrolytic
mylar
—42—
Ref. No.
Part No.
Description
C709(C759) 1-105-665-12
C711
C801
C802
C803
C804
C805
C806
C807
C808
C809
C810
C811
C812
C813
C814
C815
C816
C817
C818
C819
C820
C821
C822
C823
C824
C825
C901
C902
CT401,402
CV101,102
CV103,104
CV105,106
CT101,102
CT103,104
0.0022 +10 %
50V mylar
1-121-935-11 100 25 V electrolytic
1-105-917-12 0.022 +10% 200V mylar
1-105-917-12 0.022 +10% 200 V mylar
1-105-917-12 0.022 +10% 200 V mylar
1-105-917-12 0.022 +10% 200V mylar |
1-123-065-11 330 25 V electrolytic
1-123-065-11 330 25 V electrolytic
1-121-413-11 100 6.3 V electrolytic "
1-121-411-11 47 50 V electrolytic
1-121-392-11 13.3 25 V electrolytic ,
1-121-726-11 0.47 50 V electrolytic
1-121-936-11 220 25 V electrolytic
1-121-936-11 220 25 V electrolytic
1-121-391-11 1 50 V electrolytic
1-121-935-11 100 25V electrolytic
1-121-935-11 100 25 V electrolytic
1-123-058-11 147 50 V electrolytic
1-123-058-11 47 50 V electrolytic
1-105-725-12 0.1 +10% 100 У mylar
1-105-725-12 0.1 +10 % 100 У mylar
1-105-677-12 0.022 10% 50\У mylar
1-121-392-11 3.3 25 V electrolytic
1-105-673-12 0.01 110% SOV mylar
1-105-673-12 0.01 +10% 50V mylar
1-123-101-11 4,700 50V electrolytic
1-123-101-11 4,700 50 V electrolytic
1-141-095-00 capacitor, trimmer
1-151-232-12 capacitor, tuning
RESISTORS ‘
All resistors are in £2, + 5 %, % W and carbon type unless
otherwise indicated.
R101
R102
R103
R104
R105
R106
R107
R108
R109
R110
R111
R112
R113
R114
1-244-665-11
1-242-689-11
1-242-696-11
1-242-666-11
1-242-673-11
1-242-642-11
1-242-697-11
1-244-692-11
1-242-666-11
1-242-677-11
1-242-685-11
a A a тт ня а =
чо а т чо о чт ой ай ион
10k
6.2k
510
1.5k
3.3k
STR-7055
Ref. No. Part No. Description Ref. No. Part No. Description
R115 1-242-677-11 1.5k R248 1-244-731-11 270k
R116 1-242-721-11 100k R249 1-242-714-11 51k
R117 1-244-697-11 10k R250 1-242-745-11 1M
R118 1-244-675-11 1.2% | R251 1-242-735-11 390k
R119 1-244-708-11 30k R252 1-242-723-11 120k
R253 1-242-711-11 39k
R201 1-244-655-11 180 R254 1-242-721-11 100k
R202 1-242-661-11 330 R255 1-242-745-11 1M
R203 1-242-671-11 820
R204 1-242-693-11 6.8k | R301 1-242-669-11 680
R205 1-242-663-11 390 R302 1-242-701-11 15k
R206 1-242-680-11 2k R303 1-242-684-11 3k
R207 1-244-649-11 100 R304 1-242-684-11 3k
R208 1-242-673-11 1k R305 1-242-681-11 2.2k
R209 1-242-687-11 3.9k R306 1-202-559-11 270 15% AW composition
R210 1-242-673-11 1k R321(R371) 1-242-709-1133 k
R211 1-242-649-11 100 R322(R372) 1-242-693-11 — 6.8k
R212 1-244-649-11 100 R323(R373) 1-242-693-11 6.8k
R213 1-242-691-11 5.6 k R324(R374) 1-242-713-11 47k
R214 1-242-661-11 330 R325(R375) 1-242-724-11 130k
R215 1-242-684-11 3k R326(R376) 1-242-665-11 470
R216 1-242-669-11 680 R327(R377) 1-242-693-11 6.8k
R217 1-242-663-11 390 R328(R378) 1-242-681-11 2.2k
R218 1-242-661-11 330 R329(R379) 1-242-663-11 2390
R219 1-242-669-11 680 R330(R380) 1-242-709-11 33k
R220 1-242-663-11 390 R331(R381) 1-242-681-11 2.2k
R221 1-244-649-11 100
R222 1-242-672-11 910 R401 1-242-697-11 10k
R223 1-242-697-11 10k R402 1-242-690-11 5.1 k
R224 1-242-641-11 47 R403 1-244-673-11 1k
R225 1-242-641-11 47 R404 1-242-649-11 100
R226 1-242-721-11 100k R405 1-242-716-11 62k
R227 1-242-745-11 1M R406 1-242-682-11 2.4k
R228 1-242-745-11 1M R407 1-242-671-11 820
R229 1-242-721-11. 100k R408 1-242-697-11 10k
R230 1-244-649-11 100 R409 1-242-673-11 1k
R231 1-242-673-11 1k R410 1-242-656-11 200
R232 1-242-70611 24k R411 1-242-709-11 33Kk
R233 1-242-655-11 180 R412 1-242-687-11 3.9k
R234 1-242-713-11 47k R413 1-242-693-11 6.8k
R235 1-244-673-11 1k R414 1-242-672-11 910
R236 1-242-657-11 220 R415 1-242-641-11 47
R237 1-242-705-11 22k | R416 1-242-672-11 910
R238 1-242-703-11 18k R417 1-242-689-11 4.7k
R239 1-242-649-11 100 | R418 1-242-673-11 1k
R240 1-242-689-11 4.7 К R419 1-242-713-11 47k
R241 1-242-632-11 20 | R420 1-244-643-11 56
R242 1-242-701-11 15k
R243 1-242-699-11 12k В501(В551) 1-242-715-1156 К
R244 1-242-632-11 20 R502(R552) 1-242-737-11 470k
R245 1-242-701-11 15k R503(R553) 1-242-670-11 750
R246 1-242-699-11 12k R504(R554) 1-242-673-11 1k
R247 1-242-685-11 3.3k R505(RS55) 1-242-683-11 2.7k
—43—
Ref. No.
STR-7055
Part No.
R506(R556) 1-242-713-11
R507(R557) 1-242-741-11
R508(R558) 1-242-721-11
R509(R559) 1-242-685-11
R601(R651) 1-244-703-11
R602(R652) 1-244-717-11
R603(R653) 1-242-731-11
R604(R654) 1-242-663-11
R605(R655) 1-242-711-11
R606(R656) 1-242-677-11
R607(R657) 1-242-697-11
R608(R658) 1-242-697-11
R609(R659) 1-242-689-11
R610(R660) 1-242-697-11
R611(R661) 1-242-673-11
R612(R662) 1-242-721-11
R613(R663) 1-242-673-11
R614(R664) 1-242-721-11
R615(R665) 1-242-673-11
R616(R666) 1-242-693-11
R617(R667) 1-242-709-11
R618(R668) 1-242-649-11
R619(R669) 1-242-679-11
R620(R670) 1-242-687-11
R621(R671) 1-242-673-11
R622(R672) 1-242-715-11
R623(R673) 1-242-739-11
R624(R674) 1-242-731-11
R625(R675) 1-242-673-11
R626(R676) 1-242-701-11
R627(R677) 1-242-709-11
R628(R678) 1-242-689-11
R629 1-242-721-11
R701(R751) 1-244-745-11
R702(R752) 1-244-673-11
R703(R753) 1-244-714-11
R704(R754) 1-244-705-11
R705(R755) 1-244-677-11
R706(R756) 1-244-671-11
R707(R757) 1-244-666-11
R708(R758) 1-244-685-11
R709(R759) 1-244-697-11
R710(R760) 1-244-714-11
R711(R761) 1-202-583-11
R712(R762) 1-202-583-11
R713(R763) 1-244-699-11
R714(R764) 1-244-661-11
R715(R765) 1-244-661-11
R716(R766) 1-244-649-11
R717(R767) 1-202-511-11
R718(R768) 1-217-158-11
47 k
680 k
100k
3.3k
18k
68 k
270 k
390
39k
1.5k
10k
10 k
4.7 k
10k
1k
100 k
1k
100 k
1k
6.8k
33 k
100
1.8k
3.9k
1k
56 k
560 k
270k
lk
15 k
33 k
4.7 k
100k
1M
1k
51k
22k
1.5k
820
510
3.3k
10k
51k
2.7k
2.7k
12k
330
330
100
4.7
0.47
£5%
+5 %
5%
+5 %
Description
Y W
nW
» W
SW
composition
composition
composition
metal
—44—
Ref. No.
Part No.
R719(R769) 1-217-158-11
R720(R770) 1-202-525-11
R721(R771) 1-202-511-11
R722(R772) 1-202-565-11
R723(R773) 1-202-565-11
R724(R774) 1-244-697-11
R725 1-244-697-11
R726 1-244-697-11
R801 1-207-630-11
R802 1-207-686-11
R803 1-244-681-11
R804 1-207-667-11
R805 1-244-649-11
R806 1-244-665-11
R807 1-242-706-11
R808 1-242-721-11
R809 1-244-697-11
R810 1-242-720-11
R811 1-242-707-11
R812 1-242-726-11
R813 1-242-705-11
R814 1-244-697-11
R815 1-242-701-11
R816 1-242-703-11
R817 1-202-565-11
R818 1-244-671-11
R819 1-244-671-11
R820 1-242-705-11
R821 1-202-587-11
R822 1-202-573-11
R823 1-202-573-11
R824 1-202-579-11
R825 1-202-579-11
R826 1-244-657-11
R827 1-244-641-11
R828 1-202-550-11
R829 1-207-630-11
R831 1-244-632-11
R832 1-244-632-11
R833 1-213-121-11
R837 1-244-705-11
R901(R908) 1-244-697-11
R902(R906) 1-244-697-11
R903(R905) 1-244-719-11
R904(R907) 1-244-735-11
RT201 1-222-845-00
RT301 1-221-978-00
RT401 1-221-978-00
0.47
10
4.7
470
470
10k
10k
10k
22
100
2.2 К
220
100
470
24 К
100 К
10k
91 k
27k
160 k
22 К
10k
15 К
18k
470
820
820
22 К
3.9 К
lk
1k
1.8k
1.8 k
220
47
110
22
20
20
20
22 К
10 k
10k
82k
390 k
Description
+5% SW
15% LAW
15% LW
15% %W
15% NW
*5% 2W
*+5% SW
15% 2W
+5% “BW
+5% VW
+5% RW
15% LW
5% LAW
5% RW
15% AW
15% 2W
15% “BW
100 k (B), adjustable
4.7 k (B), adjustable
4.7 k (B), adjustable
metal
composition
composition
composition
composition
wirewound
wirewound
wirewound
composition
composition
composition
composition
composition
composition
composition
wirewound
fuse, metal-coate
Ref. No.
RT701
(RT751)
RV601
(RV651)
RV602
(RV652)
RV603
(RV653)
RV604
(RV654)
Si
52
53
Sá
55
56
57
58
59
510
sii
CF201,202
CP301,302
Part No. Description
1-221-967-00 10 k (B), adjustable
1-224-102-11 250 k(M)/250 k (M), variable
(VOLUME)
1-224-102-11 250 k (B)/250 k (B), variable
(BALANCE)
1-224-101-11 50 k (B), variable (TREBLE)
1-224-101-11 50 k (B), variable (BASS)
SWITCHES
1-516-252-00 rotary/slide (FUNCTION)
1-516-036-00 lever (MONITOR 1)
1-516-036-00 lever (MONITOR 2)
1-516-196-00 rotary/slide (MODE)
1-516-036-00 lever (LOUDNESS)
1-516-197-00 rotary/slide (FILTER)
1-514-524-00 — slide (NORMAL/SEPARATE)
1-516-198-00 rotary/slide (SPEAKER)
1-516-036-00 | lever (MUTING)
1-514-448-00 slide (DE-EMPHASIS)
1-516-315-00 lever (POWER)
FILTERS
1-527-507-11 fmi-f, ceramic 10.70 MHz (red)
1-527-507-21 fmi-f, ceramic 10.66 MHz (black)
1-527-507-31 fm i-f, ceramic 10.74 MHz (white)
1-527-507-41 fm i-f, ceramic 10.62 MHz (green)
1-527-507-51 fmi-f, ceramic 10.78 MHz (yellow)
1-231-224-00 filter, low-pass
— 45
Ref. No.
CB701
(CB751)
CP201
CP901
CNJ901
CNJ902
CNJ904
CNI905
F901,902
1901-908
(J951-958)
M901
PL901,902
PL903
PL904
PL90S
Vs901
TM901 —
904
STR-7055
Part No. Description
MISCELLANEOUS
1-532-320-00 breaker, circuit
1-231-193-00 encapsulated component
1-231-057-00 encapsulated component,
0.033 uF +120 £2
1-509-517-00 connector, REC/PB
1-507-265-00 jack, HEADPHONE
1-507-170-00 jack, AUX
1-509-546-00 connector, ac; 3-p
1-532-252-00 fuse, 2.5 A
1-507-393-00 jack, phono; 8-p
1-520-154-00 meter, TUNING
1-518-116-00 lamp, dial 11 V/0.36 A
1-518-124-00 lamp, TUNING 8 V/0.25 A
1-518-151-00 pointer (with lamp)
1-518-158-00 lamp, STEREO 8 V/0.0} A
1-526-520-11 selector, voltage
1-509-437-22 socket, power transistor
1-517-058-00 holder, meter lamp
1-533-090-00 holder, dial lamp
1-535-054-00 lug terminal (A)
1-535-055-00 lug terminal (B)
1-536-353-00 terminal post, U-shaped(single)
1-536-354-00 terminal post (C)
1-536-355-00 terminal post, U-shaped(do uble)
1-536-395-00 terminal strip, 1L1 (C) |
‚ 1-536-398-00 terminal strip, 2L2 (С)
1-536-415-00 screw terminal strip, 4-p(AINTENNA)
1-582-233-00 jumper board, 8-p phom jack
310543-1 1973
Printed inJapan
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