NAD 300 User manual

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CONTENTS
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
SPECIFICATIONS
DISASSEMB LY I NSTRUCTI ONS 7
DIAL STRINGING DETAIL
ALIGNMENT AND CHECK POINTS
ALIGNMENTPROCEDURES ....9-
CHANGING POWER LINE VOLTAGES
TROUBLESHOOTI NG
TUNER FRONT-END
OO36TUNERBOARD ...2O
5027 PRE-AMPLIFIER BOARD ..,.. 21
6038 MAIN AMPLIFIER BOARD
7105 SWITCH BOARD
7110 DOLBY NR BOARD
7118 DOLBY FM CALIBRATION BOARD
BO25 POWER SUPPLY BOARD ...... 25
9025 TONE AMPLIFIEB BOARD .... 26
ELECTRICAL PARTS LIST 27 - 36
M ISCE LLAN EOUS PARTS LIST
PAGE
3- 6
7
I
12
13
18
19
22
23
24
25
37
38
39
BLOCK DIAGRAM
INTERNAL VIEW OF INTEGRATED CIRCUIT
SCHEMATIC DIAGRAM SEPARATE SHEET
2

1. SPECIFICATIONS
4.
5.
6.
A. FM SECTION
1. FM Tuning Range
*Adjustment for tuning prohibited below 87.5 MHz
in West Germany
2. Dial Calibration Accuracy 90 & 106 MHz
98 MHz
IHF Sensitivity at 90, 98 & 106 MHz
Noise and Distortion: -30 dB
lmage Rejection at 98 MHz
lF Rejection at 90 MHz
AM Rejection at 98 MHz
at 30% AM & 100% FM Simultaneous Modulation,
100 - 20,000 pV Antenna lnput
Limiter Sensitivity
at - 1 dB Below Maximum Audio
Total Harmonic Distortion at 98 MHz TAPE OUT
(at 400 Hz lOOo/o Modulation, 1,000 pV lnput)
Spurious Response at 98 MHz
Antenna lnput: 3 pV
OSC 2nd 206.7 MHz
1/2lF 103.35 MHz
10. lF Bandwidth,6 dB down Antenna lnput: 100pV
1 1 . lF Bandwidth, 50 dB down Antenna lnput: 100 pV
12. Signal-to-Noise Ratio 100% Mod., 1 mV lnput
13. Capture Ratio 1,000 prV, MONO lnput
14. Output Voltage
Stereo and Mono, 4OO H2,100% Mod. TAPE-2 OUT
15. Alternate Channel Selectivity (lH F)
Antenna lnput: 100 pV
16. Muting Threshold
B. FM MPX SECTION
1. Stereo Separation at 98 MHz
(Antenna lnput: 1,000 pV) 100 Hz
1 kHz
10 kHz
Hl-BLEND on, at 1 kHz
2. Total Harmonic Distortion
at 98 MHz Stereo, 1 mV Antenna lnput 1 kHz and/or
500 Hz 100% Mod., at REC OUT
3. Automatic Stereo Threshold
4. Residual 19 kHz & 38 kHz at 98 MHz, 1 mV lnput
5. Stereo Frequency Response 40 - 10,000 Hz
6. 19 kHz Pilot Signal Dev. to Activate
7.
9.
NOMINAL LIMIT
*87.7-108
r 150
t'100
1.8
83
90
t 200
x2OO
2.8
73
75
0.8
60
B-20
1.2
5-16
45
t1
7
1.6
o.25
250
600
70
1.2
1.0
75
10
o.4
10
50
0.6
80
80
200
800
65
2
35
40
28
13
30
33
22
1 313
UN IT
MHz
kHz
kHz
pV
dB
dB
dB
pV
o/
/o
dB
dB
kHz
kHz
dB
dB
dB
pV
dB
dB
dB
dB
o/
/o
sV
dB
dB
o/
/o
F.

LIMIT
NOMINAL
W/Channel
o/
/o
o/
/o
dB
dB
535-1,605
400
4-10
60
32
45
0.15
+0.5
-2.O
310.5
200130
2.2tO.5
200t30
200t30/30t5
t1.2
525-1,650
200
6
80
40
50
C. AM SECTION
1. AM Tuning Range
2. Sensitivity (lHF)
at 600, '1,000, 1,4OO kHz, 400 H2,30% Mod.
3. Bandwidth 6 dB down
at 1,000 kHz with Antenna lnput of 500 pVlm
4. lmage Rejection at 1,400 kHz
5. lF Rejection at 600 kHz
6. AGC Figure of Merit Form 0.2 V/m, at 1,000 kHz
7. Total Harmonic Distortion
at 1,000 kHz 5,000 pYlm Antenna lnPut,
4OO H2,30% Mod., at REC OUT
8. Dial Calibration Accuracy 600 kHz
1,000 kHz
1,400 kHz
9. Output Voltage
1 kHz 30% Mod. 5 mV/m lnput at TAPE 2 OUT
10. Signal-to-'Noise Ratio
400 Hz 30% Mod. 50 mV/m lnPut
D. AUDIO SECTION
1. Output Power
0.3% THD, 2O Hz - 20 kHz, B ohms Load,
Both Channels Driven
2. Harmonic Distortion
at 1 kHz,8 ohms Load, 65Watts OutPut
3. lntermodulation Distortion
at2Y Output,4 ohms Load
4. Frequency Response
AUX 1 W Output, 8 ohms Load
20 Hz - 2O kH,z
5. lnput Sensitivity
at 1 kHz, for 25.3 Volt Output, B ohms Load
PHONO
AUX
Mrc
TAPE IN
6. Tape Recording OutPut Level
Front Panel Phono Jack/Rear Panel DIN Jack
at PHONO lnput: i mV
7. Phono lnput Equalization
50 - 15,000 Hz
4

NOMINAL LIMIT UNIT
8. Harmonic Distortion of EO Amplifier Section
at 1 kHz, 50 mV lnput
9. Overload Capability of EO Amplifier Section
at 1 kHz, 0.1% HD
10. Tone Control
BASS at 100 Hz
TREBLE at 10 kHz
11. Gain Difference of Left and Right Channels
at AUX and PHONO
12. High-Filter at7 kHz
13. Subsonic Filter at 40 Hz
14. Channel Separation on AUX lnput.
Opposite Channel : Shorted
i00 Hz
1 kHz
10 kHz
15. Signal-to-Noise Ratio (lnput Shorted)
PHONO
AUX
TAPE IN
Volume Minimum
16. LOUDNESS Compensation (-30 dB)
100 Hz
10 kHz
17. Harmonic Distortion of Pre-Amplifier Section
20 Hz - 20 k{z,2 Volt Output 50 Kohms Load
18. lnput Sensitivity of Pre-Amplifier Section
at 1 kHz, for 25.3 Volts Output, 8 ohms Load
E. DOLBY NR SECTION
1 . Output vs lnput at R EC Position
at2k1z,0 dB=30 mV
lnput Level 0 dB
-20 dB
_;3 3B
2. Output vs lnput at PLAY Position
at 5 kHz, 0 dB=30 mV
lnput Level 0 dB
-20 dB
-30 dB
3. Frequency Response of DOLBY FM
lnput=3O mV 5 kHz
10 kHz
0.035
240
t10
t10
-5
-3
o.o2
1
70
80
70
63
85
85
90
+8
+5
0
-15.7
-21.5
-31.1
0
-26.7
-40.3
+3
+5
0.08
200
t1Ot2
!1O!2
1.5
t2
t2
+8t2
+5t2
0.1
1!O.2
t2
-15.7t2
-21.5t2
-31.1t2
t2
-26.7!2
-40.3x2
+31 1
+5r 1
50
60
50
58
75
75
85
mV
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
o/
/o
V
dB
dB
dB
dB
dB
dB
dB
dB
dB

LIMIT
NOMINAL
F. GENERAL
1. Power Requirements
22OVAC,50 Hz (12O,24O VAC,50 Hz)
2. Dimensions
508(W) x 400(D) x 145(H) mm
3. Weisht 22 Ks.

1)
2l
2. DISASSEMBLY INSTRUCTIONS
Removing the metal enclosure from chassis. (Refer to Figure A)
Remove seven screws from top of the enclosure and four screws from both sides of the en-
closure, then pull off the enclosure f rom the chassis.
Removing the Front Panel. (Refer to Figure A)
a) Pull off all the control knobs except for PLAY CAL and REC LEVEL.
b) Remove three nuts from SELECTOR, SPEAKERS and DOLBY NR controls.
c) Remove three screws from top of the Front Panel and remove Front Panel.
Note: Numbers shown in circles correspond to Miscellaneous
Parts List on Page 37.
Figure A
'-V)
PIJLLEY
DIAL DRUM
(2 TURNS)
6l)
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l'/e
t/r
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3. DIAL STRINGING DETAIL
. PULLEY
Note: Tuning capacitor should be fully closed position
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4.ALIGNMENT AND CHECK POINTS
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5. ALIGNMENT PROCEDURES
Do not attempt alignment unless the following equipment is available.
EOUIPMENT DESCRIPTION
1. AM Signal Generator 5. Stereo Modulator 9. Frequency Counter
2. Oscilloscope
3. AC Voltmeter 6. Audio Generator
7. Distortion meter
4. FM Signal Generator 8. DC Voltmeter
AM IF & RF ALIGNMENT
Output of signal generator should be no higher than necessary to obtain an output reading.
Set SELECTOR switch 51 to AM.
[--00 cm
Loop Antenna
I
I
I
STEP SIGNAL
GENERATOR
COUPLING
Refer Fig.
S.IGNAL
GENERATOR
F REOUENCY
455 kHz
(400 Hz Mod.)
RECE IVER
DIAL
SETTI NG INDICATOR
AC Voltmeter
to TAPE OUT
jack.
ADJUSTMENT REMARKS
1
Point of non-
i nterference.
(on/about
600 kHz)
T401 (RF Coil)
Both sections
CF4O1
Adjust for
maximum
reading.
2Same as Step 1600 kHz
(400 Hz Mod.) 600 kHz Same as step 11401 (OSC Coil)
L451(ANT Coil)
Adjust for
maximum
read i ng.
3Same as Step 11400 kHz
(400 Hz Mod.) 1400 kHz Same as step 1
TC107
(OSC Trimmer)
TC105
(ANT Trimmer)
TC106
(RF Trimmer)
Adjust for
maximum
reading.
Repeat steps
(2) and (3)
4 Same as Step 11000 kHz
(400 Hz Mod.) 1000 kHz Same as step 1V R4O2 Adjust for
150 mV
Audio
Output
5Same as Step 1
1000 kHz
(400 Hz Mod.)
SG output
level 28mV/m 1000 kHz SIGNAL Meter VR4O1
Adjust for
maximum
read i ng
on SIGNAL
meter
AM/FM IF
L401, T401,
cF401
TUNER
FRONT END
TC105, TC106
TC107
Fis.1 AM ALIGNMENT CONNECTION

FM RF AND IF ALIGNMENT
Signa|generatoroutputshouldbenohigherthannecessarytoobtainanoutputreading.
Set Selector switch to FM'
Signal Generator deviation: 75 kHz
REMARKS
SIGNAL
GENERATOR
COUPLI NG
SIGNAL
GENERATOR
FREOUENCY
RECEIVER
DIAL
SETTING tNDTCATOR i AOlUsrn/lerur
Connect to FM
Antenna Terminal
through FM
DummY Antenna
(300sl) Fig' 2
90 MHz
(400 Hz. Mod.)
Adjust for
maximum
reading on
AC
Voltmeter
Same as Step 1
AC Voltmeter
connected to
TAPE OUT
jack
Same as Step 1
1104
(FM OSC Coil)
L1 01
(FM ANT Coil)
L102, L103
(FM RF Coil)
(oolofi.Yil'"0'' i '06 MHz
TC104
(FM OSC
Trimmer)
TC101
(FM ANT
Trimmer)
TC102, TC103
(FM RF
Trimmer)
Adjust for
maximum
reading
Repeat steps 1 & 2 until no further improvement is possible'
T101 (FM IFT)
Same as Step 1
DC Voltmeter:
connect
between BASE
of TR305 and
Ground
T2O1 TOP
(DISCRIMI-
NATOR)
Adjust for
maximum
reading
90 MHz
(4OO Hz, Mod.)
Same as Step 1
Adjust for
0V on DC
Voltmeter
90 MHz
(400 Hz, Mod.)
Same as Step 1
Adjust for
minimum
distortion
r*o3o-1il'"a., oo uu'
Distortion
Meter
connected to
TAPE OUT
jack
T201 Bottom
Same as Step 1
Adjust for
maximum
read i ng
9BMHz I L
!4^00 Hz, Mod.) i n, ,r, I signrr Meter
SG output
level: 1 V
Same as Step 1
Same as Step 1
Adjust for
60 mV read-
ing on AC
Voltmeter
AC Voltmeter
connected to
PIN 2 (or 9) of I vnzgta(or b)
7110 DOLBY
NR BOARD
98 MHz
(400 Hz, Mod.)
Fig.2 FM DUMMY ANTENNA
FM Dummy Antenna to 300o
antenna terminal of Receiver. Zin = 5012 (75o)
10
125c} (112.50)

MPX ALIGNMENT
TAPE OUT
Fis.3 MPx ALIGNMENT CONNECTION
Set SELECTOR Switch to FM.
Tune for 98 MHz on band.
Signal Generator output level: 1000 pV, Deviation:
Connect Signal Generator to FM Antenna Terminal
RECEIVER
__l
75 k{z at 1OO% modulation of composite signal.
through FM Dummy Antenna (300S2).
FM ANTENNA
TERMINAL
TUNNER
FRONT END
1103,1101
L102, L104
T101, TC101
TC102, TC103
TC104
FM SIGNAL
GENE RATOR
FM DUMMY
ANTENNA
30t)r,
STEP
19 kHz
(PILOT SIGNAL)
MODULATION
Level
SIGNAL
GENERATOR
Freq. Set to
OUTPUT
INDICATOR
Connected to
ADJUST.
MENT ADJUST
FOR NOTE
1PI LOT OFF Stereo Modulator
(Sub Signal)
Frequency counter
connect to #12
PIN on 1C301 VR301 19 kHz
2Bo/o
Composite
1 kHz R channel
SG output
level: 5 pV
Stereo beacon
lamp V R3O2 Just
turns ON
Adjust so
TR311 turns
ON, with SG
output level
of SpV
3B% Composite 1 kHz
R channel
AC Voltmeter to
TAPE OUT jack
of R channel
Adjust input
for audio
output of
about 1.1 V
48%o Composite
1 kHz L channel
AC Voltmeter to
TAPE OUT jack
of R channel V R303a Minimum
AC Volt-
meter reading
should be at
least 30 dB
below read-
ing in step 3.
5 8% Composite
1 kHz R channel
AC Voltmeter to
TAPE OUT jack
of L channel vR303b Minimum Same as
Step 4.
11
F

MAIN AMP & DOLBY NR ALIGNMENT
NOTE:
1 . The proper bias adjustment is most important to assu re correct performance of the amplifier.
' Bias adjustment is necessary if any of the transistors are replaced in the power amplifier
circuitry or the amplifier exhibits overheating of the output transistors under normal
operating conditions.
2. This Receiver has built-in overload thermal protections, one is installed within power trans-
fornier and the others are installed on heat sinks of power transistors.
ln case of the thermal protector of power transformer, when the temperature of thermal
protector reach to 135t5'C, the thermal protector will be automatically cut out, and as
soon as the temperature goes down to 110t10'C, the thermal protector turns back on
automatically.
The protectors of heat sinks have the same effect as above except for working temperature.
When their temperature rises up to 115t5"C, these protectors will be automatically cut
out, and as soon as the temperature falls down to 40t19'9, these protectors turn back on
automatically.
STEP ADJUSTMENT INDICATOR REMARKS
1VR601a, b
(Bias control) DC Voltmeter Adjust for 0.025V across R629a, b or R630a, b
(0.82) with no signal.
2VR602a, b (DC
balance control
of output)
DC Voltmeter Connect DC Voltmeter to SPEAKE R terminals.
Adjust for 0Vt20 mV reading on DC Volt-
meter.
3vR702
(output level con-
trol of 400 Hz
TONE)
AC Voltmeter Connect AC Voltmeter to output terminal
(Pin #11 of 7110 DOLBY NR Board.
Adjust for 30 mV reading on AC Voltmeter.
4VR701a, b
(DOLBY level
cal. of SIGNAL
Meter
SIGNAL Meter Adjust for DOLBY level on SIGNAL Meter
reading with 400 Hz TONE button (located on
the Front Panel) pushed in position, with
DOLBY NR switch to the PLAY position.
12

1.
2.
A,
B.
Ci. CHANGING POWER LINE VOLTAGES
The NAD300 has a multi-voltage Power Transformer of 12OV,22OV and 240V.
Remove the chassis out of cabinet and open the bottom cover of chassis.
Change the soldering of primary transformer wire as follows (with a setting of 22OV as indi-
cated in figure).
To change from22OY to24OV.
Remove the white wire from pin-2 of terminal strip and connect the white wire to pin-1
(already connected orange wire).
To change trom 22OV to 120V.
Remove the orange wire from pin-1 and the white wire from pin-3 of terminal strip, then
connect the orange wire to pin-4 of terminal strip and the white wire to lug of fuseholder
(alredy connected gray wire).
Also remove the white wire to pin-2 of terminal strip and connect the white wire to pin-3
of terminal strip.
,,WARN ING" lf the power transformer connections are not set for the correct local voltage
the set will be damaged in case it is switched on.
Please RE-CHECK the connections before power goes on.
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13

T,TROUBLESHOOTING
Symptom
1) Fuse blows when power is turned on. --
Power Transformer T851 defective.
R ep lace the transformer.
Short in the primary or secondary of transformer
circuitry.
Repair the short.
Damaged rectifier D806, D805, D831, D832.
Replace the damaged rectifier.
Short circuit in the power transistor TR610,
TR611 ,TR612, TR613.
Replace the defective transistor and check circuit.
Resistor R811, R821 defective (open).
Replace the defective resistor.
Capacitor C807, C809, C810 or CB14 defective.
Replace the defective capacitor.
Open in secondary winding of the power
transformer T851.
Replace the transformer.
Transistor TR807 or TR810 damaged (open),
Replace the damaged transistor.
Diode D803 or D804 damaged.
Replace the damaged diode.
A)
B)
c)
D)
A)
B)
c)
D)
E)
2l Pilot lamp lights but no sound from
both channels.
3) "A" Speakers do not worl(. A) Speaker switch S17 defective.
Replace the switch,
4l "B" Speakers do not work. A) Speaker switch S17 defective.
Replace the switch.
One channel does not work with
VOLUME at maximum with a test
signal applied to the center terminal
of VOLUME control VR551 of
the dead channel.
5) A) Defect in transistor TR901, TR902, TR903 or
TR904 of 9025 TONE AMP BOARD.
Locate and correct the defect.
Defect in transistor TR751 ,1R752 of 7105
SWITCH BOARD.
Locate and correct the defect.
Defect in transistor TR601-TR613 of 6038
MAIN AMP BOARD.
Locate and correct the defect.
Break in copper foil of printed circuit board
6038, 7105 or 9025.
Repair the circuit board.
Short in speaker output terminal.
Repair the short.
B)
c)
D)
E)
14

t:
Symptom Cause and Remedy
6) Same as 5 above but channel operates
when test signal is applied as 7. A) Defective transistor TR501, TR502, TR503, or
TR504.
Replace the defective transistor.
B) Faulty resistor R502, R504, R505, R506, R51O
or R512.
Replace the faulty resistor.
C) Faulty capacitor C501 or C505.
Replace the faulty capacitor.
D) Defective selector switch S1.
Repair or replace the switch.
7\ Speaker works normally but
headphones do not work. A) Headphone plug does not mate with jack.
Replace the plug.
B) Defective resistor R651a, b.
Replace the resistor.
8) 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 S1
9) PHONO input not operative. A) Poor contact in PHONO input jack.
Repair or replace the jack.
B) Faulty selector switch S1.
Repair or replace the switch.
10) TAPE OUT not operative. A) Defective contact in TAPE OUT jack.
Repair or replace the jack.
1 1 ) FM does not operate. A) Defective diode D833.
Replace the diode.
Transistor TR831 damaged (open).
Replace the transistor.
Defective resistor R831.
Replace the resistor.
Short-circuit in Tuner B+ circuit.
Repair the short.
Poor contact in selector switch S1.
Repair or replace the switch.
Resistor R301 defective.
Replace the resistor.
Capacitor C301 defective.
Replace the capacitor.
Defective lC 1C201 ,lC2O2,lC203 or 1C301.
Replace the defective lC.
Defective IFT T201.
Replace the lFT.
B)
C)
D)
E)
F)
G)
H)
t)
15

Symptom Cause and RemedY
J) Defective capacitor C2O2, C208 or C222'
Replace the defective caPacitor.
Defective transistor TR 101, 1 R1O2, TR 1 03
coil L101, L104 of tuner f ront-end.
Replace the defective comPonent.
Faulty lead-in.
Repair or rePlace the lead in,
K)
L)
nlmproper adjustment
Readjust f2O1, VR301 and VR303a, b'
(Refer to MPX ALIGNMENT on page 1 1')
Defective transistor TR301, T8302, TR303 or
lC lC3O1, lC3O2 of Turner Board 0036'
Replace the defective comPonent.
Variable resistor V R301 defective.
Replace the variable resistor.
Variable resistor VR303a, b defective.
Replace the defective variable resistor'
B)
C)
D)
12\ Poor multiPlex seParation.
13) Stereo indicator lamp does not light' A) Defective indicator lamP PL9.
Replace the lamP.
lmproper adjustment of VR301 and VR302 of
0036 TUNER BOARD.
Make readjustment.
(Refer to MPX ALIGNMENT on page 1 1')
Defective lC3O1 or R835 of 0036 TUNER
BOARD.
Rep lace defective comPonent.
lf volume both L and R channels not enough:
Front End defective, or faulty IFT T201 or
diode D207, D2OB of 0036 TUNER BOARD or
faulty C313, lC3O1 or 1C302 of 0036 TUNER
BOARD.
Locate and replace the defective component'
lf sound of one channel not enough:
Defective lC3O2 of 0036 TUNER BOARD'
Replace the lC.
B)
c)
A)
B)
14\ FM volume not sufficient'
15) AM does not operate' A) Damaged lC4O1 of Tuner Board 0036'
Replace.
B) Defective Coil L401 ,T4O1or Ceramic Filter
CF4O1 of 0036 Tuner Board'
Replace the defective comPonent'
C) Selector switch S1 defective.
Repair or rePlace the switch.
D) Defective Tuning Gang.
Replace.

Symptom Cause and Remedy
E) Damaged AM bar antenna.
Repair or replace bar antenna.
16) LOUDNESS has no effect. A) Defective LOUDNESS switch S5.
Replace the switch.
B) Defective C758, C759 or R765.
Replace defective component.
C) Defective VOLUME control VR551
Replace.
17l, STEREO-MONO not effective. A) Defective MONO switch 56.
Replace the switch.
18) TAPE-MONITOR not effective. A) Defective TAPE MONITOR switch 52.
Replace the switch.
B) Poor contact in TAPE input jacks.
Repair or replace the jack.
19) BASS control has no effect. A) V R902 defective.
Replace.
B) Defective C905, C906, R911, R912, R913 of
9025 Tone Amplifier Board.
Replace defective component.
2Ol TREBLE control has no effect. A) VR901 defective.
Replace.
B) Defective C904, R908 or R909 of 9025 Tone
Amplifier Board.
Replace the defective component.
21l, Excessive noise with PHONO
(MAG) input. A) Faulty TR501, TR502, TR503 or TR504.
Replace the faulty transistor.
B) Faulty R501, R503, R506, C501 or C505.
Replace the faulty component.
22\ Noisy VOLUME control. A) Defective VR551.
Replace the variable resistor.
B) Defective capacitor C505 or C901.
Replace the defective capacitor.
23l' SIGNAL meter not functioning. A) Defective meter.
Replace the meter.
B) f n case of FM reception, C209, C21O, D203,
D2O4, D205 or D206 defective.
Replace the defective component.
C) ln case of AM reception, R407, R408, R409,
R410 or TR401 defective.
Replace the defective component.
I
I
17

l-
Cause and Remedy
A) Defective meter.
Replace the meter'
B) ln case of FM reception, R227,C224 or C225
defective.
Replace the defective comPonent'
Note: ln case of AM reception, the meter does
not function.
24\ TUNING meter not functioning'
A) Defective switch S17'
Replace the switch.
251 OUADRO not effective.
A) Defective switch 57'
Replace the switch.
B) Defective capacitor C752, C753 or C754'
Replace the defective caPacitor'
26]t SUBSONIC filter has no effect'
A) Defective switch S8.
Replace the switch.
B) Defective C755, C756, TR751 or TR752'
Replace the defective comPonent'
271 High-Filter has no effect.
DOLBY NR switch 54 defective'
Repair or rePlace the switch.
lC 1C701 defective.
Replace the lC.
DOLBY Noise Reduction
has no effect.

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