Realistic STA-95 User manual

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Serulce amuaI
STA.95
AM /FM STEREO RECEIVER
Catalog Number: 31 -2082
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CONTENTS
page
1. SPECIFICATIONS 3&4
2, BLOCK DIAGRAM . ...... .5
3. DISASSEMBLYINSTRUCTIONS ....6
4, DIAL STRINGING DIAGRAM. .....6
5. ALIGNMENT PROCEDURE. ,7 _9
6. ALIGNMENT & CHECK POINTS . . .. . ...10
7. LEVELDTAGRAM. .......11
9. 0062 TUNER BOARD .. 18& 19
10. 5042 PRE-AMP BOARD.... .....20
11. 6052 MAIN-AMP BOARD... .......21
12.7159INPUTBOARD... .:...........22
13. 8034 POWER SUPPLY BOARD ,.,23
14. 9035 TONE CONTROL BOARD . . . , ... .24
15. SEMICONDUCTOR LEAD IDENTIFICATION ,,,,..,25
16. ELECTRICAL PARTS LIST . . 26 _ 33
17, MISCELLANEOUS PARTS LIST . .... 34 &35
18. SCHEMATIC DIAGRAM. . SEPARATE SHEET
19. EXPLODED VIEW. .... SEPARATE SHEET

SPECIFICATIONS
NOMINAL LIMIT UN IT
FM SECTION
1, TUNING COVERAGE
2. DIAL CALIBRATION ACCURACY 90 MHz
98 MHz
106 MHz
3. USABLE SENSITIVITY
(NOtSE & DTSTORTION -30 dB)
4, IMAGE REJECTION (at 106 MHz)
5. lF REJECTION (at 90 MHz)
6. FULL LIMITING (at _3 dB)
7. lF BANDWIDTH (6 dB down)
8. DISTORTION (1 mV INPUT)
9. SIcNAL-TO-NOISE RATIO (1 mV INPUT)
10. DE-EMPHASIS 75 psec. (at 50-10,000 Hz)
11. DISCRIMINATOR BANDWIDTH (Peak-to-Peak)
12. AFC HOLDING RANGE (with 1 mV signal)
13. OUTPUT VOLTAGE MONO
(at 75 kHz dev., 400 Hz mod., 1 mV input) STEREO
MUTING THRESHOLD
OVERLOAD, THD at 98 MHz, 100% mod.
(100 mV RF input)
SPURIOUS RESPONSE at 98 MHz
ANTENNA INPUT 3 pV. 1 12\F,103.35 MHz
CAPTURE RATIO (1 mV INPUT)
ALTE RNATE CHANNE L SE LECTIVITY
(0.1 mV input)
100 Hz
1 kHz
10 kHz
87.5 - lo8l
I
I
2.O
5.0 |
50 I
80
2.o I
03 I
65
t1.5 I
400 I
l.2SO
0.75
o.7
'l
,l
80
,\
50
14.
15.
16.
17.
18.
MPX SECTION
1, STEREO SEPARATION
(10096 mod., 1 mV input)
2, DISTORTION 1 KHZ
(100% mod., 1 mV input)
3. STEREO BEACON SENSITIVITY (pilot 7%)
4. RESIDUAL 19 kHz & 39 kHz (1 mV input)
5. SUPPRESSION OF SCA INTERFERENCE
(1 mV input)
AM SECTION
1. TUNING COVERAGE
2, DIAL CALIBRATION ACCURACY 600 KHZ
1,000 kHz
1,400 kHz
3. USABLE SENSITIVITY
(400 H2,30% mod. 600 kH2,1000 kH2,1400 kHz
noise & distortion-20 dB)
4. IMAGE REJECTION (at 1,400 kHz)
5. lF REJECTION (at 600 kHz)
6. AGC FIGURE OF MERIT
(from 100 mV/m at 1,000 kHz)
Radiated
Direct
7, DISTORTION
(400 H2,30% mod., 5 mV/m input)
38
40
30
0.5
10
50
510 - 1660
250
25
35
30
45
1.5
88 - 108
t250
t2SO
t350
3.0
9.0
45
70
3.0
t 1S0
0.8
60
t2
300
t400
0.7b t 2 dB
0.65 t 2 dB
4-16
1.5
1.2
3-16
40
40
520 - 1620
t1b
t30
t40
70
3.5
40
27
32
20
500
40
30
25
30
2.5
MHz
kHz
kHz
kHz
pV
dBf
dB
dB
pV
kHz
o/
,/o
dB
dB
kHz
kHz
V
V
pV
o/
/o
dB
dB
o/
/o
pV
dB
dB
dB
dB
dB
dB
kHz
kHz
kHz
kHz
pY lm
pV
dB
dB
dB
o/
/o

NOMINAL LIMIT UNIT
8. lF BANDWIDTH (6 dB down)
9. OUTPUT VOLTAGE
(400 H2,30% mod., 5 mV/m input)
10. AUDIO RESPONSE
(5 mV/m input from 50 Hz to 2 kHz, 0 dB
@ 1,000 kHz)
11. SELECTIVITY 200 pVlm
12, SIGNAL-TO-NOISE RATIO
(1,000 kHz, with antenna input 5 mV/m)
13. AM BEAT (input 100 mV/m)
AUDIO SECTION
1, RMS OUTPUT POWER
(distortion < 0.3%,20 Hz - 20 kHz)
PER CHANNEL DRIVE 8 O
4a
BOTH CHANNELS DRIVEN B s2
4a
2. IM DISTORTION
(at 30 W output 7O/7,OOO Hz 4l1l
3. HARMONIC DISTORTION (at 30 W output)
100 Hz
1,000 Hz
10,000 Hz
4, FREOUENCY RESPONSE
(AUX, 8 Sl load, 1 W output) 30 Hz - 20 kHz
5. INPUT SENSITIVITY (for 45 W output)
PHONO
AUX
TAPE MONITOR
PHONO MAG
AUX
TAPE MONITOR
BASS 100 Hz
TREBLE 10 kHz
8. EOUALIZATION RIAA: 30 - 15,000 Hz
L PHONO AMP OVER LOAD CAPABILITY (at 1% HD)
10. HIGH FILTER 10 kHz
11. LOW FILTER TOHz
12. LOUDNESS COMPENSATION (Volume -30 dB)
10 kHz
100 Hz
13. CHANNEL SEPARATION
(AUX input 100 - 10,000 Hz)
14. SIGNAL-TO-NOISE RATIO (input shorted)
6. INPUT IMPEDANCE
7. TONE CONTROL
15. RESIDUAL NOISE
16. LOAD IMPEDANCE
PHONO MAG
AUX
120 Volts, 60 Hz AC*
23 WATTS, No Signal
190 WATTS, Full Signal
* 22Ol24O V AC, 50 Hz for European and Australian Models
250
t1
2.5
160
160
50
70
70
r10
t10
-4
28
40
50
52
48
51
0.1
0.1
0.1
o.2
150
-6
-6
4
I
40
65
80
1.0
146-
200
0.3
0.15
0.15
0.3
t 1.5
3
160 t 30
160 t 30
!10!2
t1Ot2
RIAA t 2
100
-Gt2
-Gt2
4x2
9t2
35
4-16
-6
20
32
10
46
49
45
47
58
70
3
kHz
mV
dB
dB
dB
dB
dB
mV
OHM
dB
o/
/o
W
W
W
W
o/,
o/
/o
o/
/o
o/
/o
dB
mV
mV
mV
ks2
ko
ks2
dB
dB
dB
mV
dB
dB
dB
dB
NOTE: Nominal Specs represent the design specs; all units should be able to approximate these-some
will exceed and some may drop slightly below these specs. Limit Specs represent the absolute
worst condition which still might be considered acceptable; in no case should a unit perform
to less than within any Limit Spec.

BLOGK DIAGRAM
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DISASSEMBLY INSTRUCTIONS
1. Removing chassis from Wooden Cabinet. (Refer to Fig. A)
Remove five screws (#88 & #91) from sides and back.
2. Removing the Front Panel. (Refer to Fig. A)
a) Pull off the SPEAKERS, BASS, TREBLE, DUBBING, MONITOR, VOLUME,
BALANCE, SELECTOR and Tuning knobs.
b) Remove five screws (#90) from top and bottom of Front Panel.
Figure A
a,--
rd-
-@ ffi-\
^.-'- I -
(82) .8 .
-t-v)
@'"
DIAGRAM
fully closed position.
@6
DIAL STRINGING
Note: Tuning capacitor should be in
-o

ALIGNMENT PROCEDURES
Do not attempt alignment unless the following equipment is available.
1. AM Signal Generator
2. Oscilloscope
3. AC Voltmeter
4. FM Signal Generator
5. Stereo Modulator
6. Audio Generator
7. Distortion meter
8. DC Voltmeter
9. Frequency Counter
Note: Bemove line cord antenna from FM external antenna terminal when aligning.
AM IF & RF ALIGNMENT
Note: Remove line cord antenna from FM external antenna terminal when aligning
RECEIVER
L451
TAPE OUT
Output of signal generator should be no higher than necessary to obtain an output reading.
Signal Generator Modulation: 30%.
Set SELECTOR switch SW1 to AM.
STEP SIGNAL GENE BATOR
COUPLING
SIGNAL
GENERATOR
F R EOUENCY
RECEIVER
DIAL
SETTI NG INDICATOR ADJUSTMENT
Refer Fig. 4. REMARKS
1Refer Fig. 1455 kHz
(400 Mz Mod.)
Point of non-
i nterference
(on/about
600 kHz)
AC Voltmeter
to TAPE OUT
jack T401 flFT) Adjust for maxi-
mum reading.
2Same as Step 1600 kHz
(400 Hz Mod.) 600 kHz Same as Step 1L401
L451 (OSC Coil)
(ANT Coil) Same as Step 1
3Same as Step 11400 kHz
(400 Hz Mod.) 1400 kHz Same as Step 1
TC1 05
(OSC Trimmer)
TC1 04
(ANT Trimmer)
Same as Step 1
4Same as Step 11000 kHz
(400 Hz Mod.) 1000 kHz Same as Step 1VR402 Adjust for 250
mV Audio
output.
5Same as Step 1i000 kHz
(400 Hz Mod.) 1000 kHz Receive r's
SIGNAL
Meter VR4O1
Adjust for 70o/o
reading of full
scale with input
of 5 mV/m.
Fig. 1 AM ALIGNMENT CONNECTION
I
I

FM RF AND IF ALIGNMENT
For European model, the lowest frequency of FM tuning range should not be below 87.5 MHz.
125a (1 12.5s,)
Zin = 50o (75s}) Zout = 300O (balanced)
FM Dummy Antenna to 300O antenna terminal
Fig.2 FM DUMMY ANTENNA
B
Signal generator output should be no higher than necessary to obtain an output reading
Set Selector switch to FM.
Signal Generator deviation: 75 kYz NOTE: Be sure to disconnect FM line cord antenna during alignment.
STEP SIGNAL GENERATOR
COUPLING
SIGNAL
GENE RATOR
FREOUENCY
RECE IVER
DIAL
SETTING INDICATOR ADJUSTMENT
Refer Fig. 4R EMAR KS
1
Connect to FM
Antenna Termi-
nal through
FM Dummy
Antenna
(300St) Fis. 2
90 MHz
(400 Hz, Mod.) 90 MHz AC Voltmeter
connected to
TAPE OUT
jack
L1 04
(FM OSC Coil)
Ll 01
(FM ANT Coil)
Ll02
(FM RF Coil)
Adjust for
maximum
reading on
AC Voltmeter
2Same as Step 1106 MHz
(400 Hz, Mod.) 106 MHz Same as Step 1
TC1 03
(FM OSC Trimmer)
TC1 O1
(FM ANT Trimmer)
TC1 02
(FM BF Trimmer)
Adiust for
maximum
readi ng
Repeat steps 1 & 2 until no further improvement is possible
3Same as Step 190 MHz
(400 Hz, Mod.) 90 MHz Same as Step 1T1O1 (FM IFT) Adjust for
maximum
readi ng
4Same as Step 190 MHz
(400 Hz. Mod.) 90 MHz TUNING Meter T201 (Bottom)
(Discriminator) Adjust for
center point on
TUNING meter
5Same as Step 190 MHz
(400 Hz, Mod.) 90 MHz
Distortion
Meter
connected to
TAPE OUT
jack
T201 (Top) Adjust for
minimum
d istortion
6Same as Step 198 MHz
(400 Hz, Mod.) 98 MHz Receive r's
SIGNAL
Meter vR202 Adjust for 70o/o
readi ng of fu I I
scale with input
of 1mV
7Same as Step 198 MHz
(400 Hz Mod.) 98 MHz Oscilloscope
connected to
TAPE OUT
jack VR2O1
Adjust so output
just appears with
an input signal
level of 5 pV.
1 50s2
of Receiver.

MPX ALIGNMENT
FM ANTENNA
TERMINAL
(s00 s})
Fig.3 MPX ALIGNMENT CONNECTTON
TAPE OUT
RECEIVER
I
I
I
FM SIGNAL
GENERATOR
FM DUMMY
ANTENNA
300 sl
Set SELECTOR Switch to FM.
Tune for 98 MHz on band.
Signal Generator output level : 1000pV. Deviation: 75 kHz, at 100% modulation of composite signal.
connect Signal Generator to FM Antenna Terminal through FM Dummy Antenna (300 o).
STEP
19 kHz
(PILOT SIGNAL)
MODULATION
Level
SIGNAL
GENERATOR
Freq. Set to
OUTPUT
INDICATOR
Connected to
ADJUST
Refer Fig. 4ADJUST
FOR NOTE
18% Composite 1 kHz
R channel AC Voltmeter to
TAPE OUT jack
of R channel
Adjust input for
audio output of
about 0.65 V
28Yo Composite
1 kHz L channel
AC Voltmeter to
TAPE OUT jack
of R channel VR3O2 Minimum
AC Voltmeter
reading should
be at least 32
dB below reading
in step 1.
38% Composite
1 kHz R channel
AC Voltmeter to
TAPE OUT jack
of L channel VR3O2 Minimum Same as Step 2.
4PI LOT OFF Carrier only
Frequency
Counter Connect
to TP (#18 pin)
of PCB 0062 and
ground
VR301 19 kHz
lf you did not obtain -30 dB readings in steps 2 and 3 (compared with step 1), readjust VR302 until you obtain -32 dB
reading for both steps 2 and 3.
MAIN AMPLIFIER ALIGNMENT
INDICATOR ADJUSTMENT REMARKS
DC Voltmeter VR601 a, bAdjust for 0.005 V - 0.01 V across
R622 a, b (0.33 ohm) with no signal

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ALIGNMENT & CHECK POINTS
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o
(0
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10
Fig.4

SPEAKE R
OUT
LEVEL DIAGRAM
FREOUENCY = lkHz
dt
''tr
=
(3
lIJ
(5
F
J
o
I NPUT
SE LECTO B
18.9V
45W/ 8f,
11

TROUBLESHOOTING
SYMPTOM CAUSE AND REMEDY
1) Receiver not operative; pilot lamp
does not light. A) Faulty AC power cord
Replace the cord.
B) Defect in the power switch
Replace the switch.
C) Broken wire in the power transformer
Replace the transformer.
D) Broken power fuse
Replace the fuse.
2l Fuse blows when power is turned on. A) Power transformer T851 defective
Replace the transformer.
B) Short in the primary or secondary of the
transformer circuitry
Repair the short.
C) Damaged rectifier D851
Replace the rectifier.
D) Short-circuit in the rectifier circuit
Repair the short.
E) Short circuit in power transistor TR609a, b or
TR610a, b
Replace the defective transistor(s) and check circuit.
3) Pilot lamp does not light. A) Defective lamp(s)
Replace lamp(s).
B) Disconnection in the power transformer T851
tertiary winding
Replace the transformer.
4l Pilot lamp lights but no sound from
either channels. A) Resistor R801, R804 or R809 open
Replace the resistor(s).
B) Capacitor C801, C802 or C807 defective
Replace the defective capacitor(s).
C) Diode D851 damaged
Replace the diode.
D) Open in secondary winding of the power
transformer T851
Replace the transformer.
E) Transistor TRB03 (open), TR804 (short),
TR805 (short) or TR806 (open) damaged
Replace the damaged transistor(s).
F) Diode D801 (short) damaged
Replace the diode.
5) A SPEAKERS do not work. A) Speaker switch SW9 defective
Replace the switch.
6) B SPEAKERS do not work. A) Speaker switch SW9 defective
Replace the switch.
12

SYMPTOM CAUSE AND REMEDY
7l One channel does not work with
VOLUME at maximum, with a test
signal applied to the center terminal
of Volume Control VR902 of the
dead channel.
Defect in transistor TR901, TR902 or TR903 of
Tone Amp Board 9035
Locate and correct the defect.
Defect in transistor TR601, TR602, TR603,
TR6O4, TR6O5, TR6O6, TR6O7, TR6O8,
TR609, TR610, TR611 or TR612 of MAIN
AMP Board 6052
Locate and correct the defect.
Short in speaker output terminal
Repair the short.
Defective resistor R902, R903, R905, R906,
R907, R908, R909, R917, R921,or R922of
TONE AMP Board 9035
Replace the defective resistor(s).
Defective resistor R602, R603, R604, R605,
R606, R607, R608, R609, R610, R613 0r
R615 of Main Amp Board 6052
Replace the defective resistor(s).
A)
B)
c)
D)
E)
8) Same as 7 above but channel operates
when test signal is applied as 7. A) Defective lC (1C501 NJM 4558D-D)
Replace the lC.
B) Faulty resistor R502, R503, R504, R510 or
R511 of Pre-Amp Board 5042
Replace the faulty resistor(s).
C) Faulty capacitor C501 or C506
Replace the faulty capacitor(s).
D) Defective SELECTOR switch SW1
Repair or replace the switch.
9) Speaker works normally but
headphones do not work. A) Headphone plug does not mate with jack Replace the plug.
B) Defective resistor R651
Replace the resistor.
10) All the inputs work normally except
AUX input. A) Poor contact in AUX input jack Repair or replace the jack.
B) Poor contact in SELECTOR switch SW1
Repair or replace the switch.
1 1) PHONO input not operative. Poor contact in PHONO input jack
Repair or replace the jack.
Faulty SELECTOR switch SW1
Repair or replace the switch.
A)
B)
121 TAPE MONITOR 1(or2) OUTnot
operative. A) Defective contact in TAPE MONITOR 1 (or 2l OUT jack
Repair or replace the jack.
B) Defective contact in TAPE MONITOR switch SW3
Repair or replace the switch.
13) FM does not operate. A) Transistor TR801 or TRB02 damaged
Replace the damaged transistor(s).
13

SYMPTOM CAUSE AND REMEDY
13) FM does not operate.
l)
Transistor TR801 or TR802 damaged
Replace the damaged transistor(s).
Resistor R801 defective
Replace the resistor.
Short circuit in Tuner B+ circuit
Repair the short.
Poor contact in SELECTOR switch SW1
Replace the switch.
Resistor R304 defective
Replace the resistor.
Capacitpr C302 defective
Replace the capacitor.
Defective transistor TR201 or lC 1C201, 1C203
Replace the defective transistor or lC(s).
Defective IFT T201
Replace the lFT.
Defective resistor R203 or R208
Replace the resistor(s).
Defective transistor TR101 ,TR102, TR103 0r
coil L101, L1 02, L103, L104 of Tuner Board
0062
Replace the defective component(s).
Faulty lead-in
Repair or replace the lead in.
A)
B)
C)
D)
E)
F)
G)
H)
J)
K)
14) Poor multiplex separation A) lmproper adjustment
Readjust T2O1 , VR301 and VR302.
(Refer to MPX ALIGNMENT on page 9)
B) Transistor TR2O2, TR203, TR2O4, TR3O1,
TR302, TR303, TR304, TR305 or tC tC301
defective.
Replace the defective component(s).
C) Variable resistor VR302 defective
Replace the variable resistor.
15) Stereo indicator LED does not
light. A) Defective indicator LED D755
Replace the LED.
B) lmproper adjustment of VR201 of Tuner
Board 0062
Make readjustment.
(Refer to MPX ALIGNMENT on page g)
C) Defective lC 1C301 or resistor R307
Replace the defective component(s).
16) FM volume not sufficient A) If volume of both L and R channels not enough:
Front End defective, or faulty lC 1C201, IFT
T201 or faulty capacitor C224, C301 of Tuner
Board 0062
Locate and replace the defective component.
B) lf sound of one channel not enough:
Defective L301 (Board 0062) in case of R channel,
or defective L302 (Board 0062) in case of L
channel
Replace the defective coil(s).
14

SYMPTOM CAUSE AND REMEDY
17], AM does not operate. A) Damaged 1C401 of Tuner Board 0062
Replace the lC.
Defective L4O1 , T4O1 , CF401 or T4O2 ot
Tuner Board 0062
Replace the defective component(s).
Defective transistor TR401
Replace the transistor.
Resistor R4O2, R409 or R411 defective
Replace the defective resistor(s).
Capacitor C416 or C419 defective
Replace the defective capacitor(s).
Selector switch SW1 defective
Replace the switch.
Defective tuning gang
Replace tuning gang.
Damaged AM bar antenna
Bepair or replace bar antenna.
B)
C)
D)
E)
F)
G)
H)
18) LOUDNESS has no effect A) Defective LOUDNESS switch SWS
Replace the switch.
B) Defective capacitor C901, C902 or resistor R904
Replace the defective component(s).
C) Defective VOLUME control VR902
Replace the VOLUME control.
19) Stereo-Mono not effective A) Defective MONO switch SW4
Replace the switch.
2Ol TAPE MONITOR not effective A) Defective TAPE MONITOR switch
Replace the switch.
B) Poor contact in TAPE MONITOR input jacks
Repair or replace jack(s).
21\ BASS control has no effect A) Variable resistor VR904 defective
Replace.
B) Defective C908, C909 or R912, R913, R914,
R91 5
Replace the defective component(s).
221 TREBLE control has no effect A) Variable resistor VR903 defective
Replace.
B) Defective C907, R910, R911, R916
Replace the defective component(s).
23], Excessive noise with PHONO input A) Faulty lC 1C501
Replace the lC.
B) Defective capacitor C501, C506 or resistor R501,
R503, R505, R506
Replace the defective component(s).
15

SYMPTOM CAUSE AND REMEDY
24], Noisy VOLUME control A) Defective VR902
Replace.
B) Defective capacitor C506 or C903
Replace the defective capacitor(s).
25l, SIGNAL meter not functioning
26l, TUNING meter not functioning
A) Defective meter
Replace meter.
B) Defective capacitor C402
Replace the capacitor.
C) ln case of FM reception, lC2O1, TH201 or
V R202 defective.
Replace the defective component(s).
D) ln case of AM reception, VR401 defective
Replace,
A) Defective meter
Replace the meter.
B) Resistor R226 defective
Replace the resistor.
27) LO Fl Lter has no effect
28) Hl FlLter has no effect
A) Defective switch SWB
Replace the switch.
B) Defective capacitor Cg14
Replace the capacitor.
A) Defective switch SW7
Replace the switch.
B) Defective resistor R919 or capacitor C913
Replace the defective component(s).
16

NOTE:
1. This Receiver has built-in over load thermal protection for abnormal operation.
When the temperature of thermal protector (installed with heat sink) does rise abnormally
(9015'C), the thermal protector will automatically cut out, and as soon as the temperature
goes down suff iciently (35115'C), the thermal protector turns back on automatically.
lf the Receiver does turn itself off, check ventilation and speaker connections.
r_,
t_
SWlO
r---1
Transistors TR611 and TR612 protect audio output stage
when abnorma lly high current flows in TR609 and
TR610 caused by excessive input drive, or too low
impedance load is connected at output.
lf increase of the current is excessive, the voltage across
R622 and R623 will turn on TR611 and TR612 which are
not normally biased on and collectors of these transistors
(through D602 and D603 diodes) reduce biases on TR607
and TR60B which decreases drive to output transistors
TR609 and TR610 to reduce the current.
This occurs to protect not only the circuit but also the
speakers against high level switching clicks and pop noises.
POWEB TRANSFORI\1EH
T851
T SINK OF POWEB TRANSISTOBS
THEBMAL PROTECTOR
AC 120V 6oHz -
i
=
POWER
lj'---J
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2.
t
=
.
6
o
F
17

0062 TUNER BOARD (TOP VIEW)

0062 TUNER BOARD (BOTTOM VIEW)

5042 PRE.AMP BOARD (TOP VIEW)
PHONO AUX
5042 PRE.AMP BOARD (eorroM VIEW)
AUX
20