Marantz QUADRADIAL 4 User manual
-----------·~
TABLE
OF CONTENTS
SECTION PAGE
Introduction ....................................................................................................................... 1
Service Notes ....................................................................................................................... 1
AM
Tuner ........................................................................................................................... 1
FM
Tuner ........................................................................................................................... 2
Phono and Pre-Amplifier·.......................................;............................................................... 4
Power
Amplifier
................................................................................................................... 5
Power Supply
Unit
............................................................................................................... 5
Audio
Trouble Analysis ....................................................................................................... 5
Test Equipment Required
for
Servicing ............................................................................... 6
AM Alignment Procedure ................................................................................................... 6
FM Alignment Procedure....................................................................................................... 7
Audio
Adjustment ...............................
...
........
...
.................................................................. 8
Automatic
Voltage Regulator Adjustment ........................................................................... 8
Parts List .........................................................................
..
...............
...
........................ 21 -
34
Technical Specifications ...............................................................................................
34
-
35
LIST
OF
ILLUSTRATIONS
FIGURE NO. PAGE
1.
Dial Stringing ............................................................................................................... 8
2.
Front
Panel
Adjustment and Component Locations ................................................... 9
3.
Main
Chassis
Component Locations (Top View) ........................................................... 9
4.
Rear
Panel
Adjustment and Component Locations ....................................................... 10
5.
Main
Chassis
Component Locations (Bottom View) ................................................... 10
6.
FM
Front
End Assembly P100 Component Locations ...................................................
11
7. AM Tuner Assembly P150 Component Locations .......................................................
11
8.
FM
IF
Amplifier
Assembly P200 Component Locations ............................................... 12
9. MPX Stereo Decoding
Amplifier
Assembly P300 Component Locations .......................
13
10. ·
Pre,
Tone
Amplifier
Assembly P400 Component Locations ....................................... 13
11. Noise and
DC
Amplifier
P470 Component Locations ................................................... 14
12. Vari-Matrix
Unit
Assembly P500 Component Locations ............................................... 15
13. Loudness, Hi-Filter and Speaker Switch
Unit
Assembly P550 Component Locations ... 15
14. Temperature Compensation
Unit
Assembly P580 Component Locations ................... 15
15. Power
Amplifier
Assembly P600 Component Locations ............................................... 16
16. Phono
Amplifier
Assembly P700 Component Locations ............................................... 17
17. Tone Control
Unit
Assembly P750 Component Locations ........................................... 17
18. Power Supply
Unit
Assembly P800 Component Locations .......,................................... 18
19. AC Rectifier Assembly P850 Component Locations ................................................... 18
20. Balance Control
Unit
Assembly P900 Component Locations ....................................... 18
21. Schematic Diagram .......................................................................
..
...................
19
-
20
INTRODUCTION
This service manual
was
prepared
for
use
by Authorized Warranty Stations and contains
service information
for
Marantz Model 4430 Quadradial 4
RE!ceiver.
Servicing information
and
voltage data included in this manual
are
intended
for
use
by the
knowledgeable
and
experienced technician only.
All
instruction should
be
read
carefully. No
attempt
should
be
made
to
proceed
without
a good understanding
of
the operation in the
receiver.
The parts list furnish information by which replacement part may
be
ordered
from
the
Marantz Company. A simple description
is
included
for
parts which
can
be
usually
be
obtained
through local suppliers.
1.
SERVICE NOTES
As
can
be
seen
from
the
circuit
diagram, the
chassis
of
Model 4430 consists
of
following
units.
Each
unit
mounted on a printed
circuit
board
is
described
within
the square enclosed by
a bold dotted line on the
circuit
diagram.
1.
FM
Front
End . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . mounted on
P.
W.
Board, P100
2.
AM Tuner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . mounted on
P.
W.
Board, P150
3.
FM
IF
Amplifier
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . mounted on
P.
W.
Board, P200
4.
MPX Stereo Decoding
Amplifier
. . . . . . . . . . . . . . . . . mounted on
P.
W.
Board, P300
5.
Pre,
Tone
Amplifier..
. . . . . . . . . . . . . . . . . . . . . . . . . mounted
on
P.
W.
Board, P400
6.
Noise and
DC
Amplifier
. . . . . . . . . . . . . . . . . . . . . . . mounted on
P.
W.
Board, P470
7.
Vari-Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . mounted on
P.
W.
Board, P500
8.
Loudness, Hi-Filter
and
Speaker Switch
Unit
. . . . . . . mounted on
P.
W.
Board, P550
9.
Temparature Compensation . . . . . . . . . . . . . . . . . . . . . mounted on
P.
W.
Board, P580
10. Power
Amplifier
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . mounted on
P.
W.
Board, P600
11. Phono
Amplifier
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . mounted
on
P.
W.
Board, P700
12. Tone Control
Unit
...........................
mounted on
P.
W.
Board, P750
13. Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . mounted on
P.
W.
Board, P800
14. AC Rectifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . mounted on
P.
W.
Board, P850
15. Balance Control
Unit
. . . . . . . . . . . . . . . . . . . . . . . . . mounted on
P.
W.
Board, P900
16. Indicator Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . mounted on
P.
W.
Board, P950
2.
AM
TUNER
All
components except tuning capacitor
and
ferrite bar antenna
are
mounted on a printed
circuit
board P150.
The
AM
signals induced in a ferrite bar antenna
are
applied
to
the
base
of
RF
amplifier
transistor H151 through a capacitor
of
C151
and amplified
to
the level required
for
overcoming
the conversion
noises,
thus giving good SIN performance. The tuned circuits inserted in both
out
and
input
circuit
of
the
RF
amplifier
assure
very high
image
and
spurious rejection per-
formance. Thus amplified and selected AM signals
are
then applied
to
the
base
of
converter
transistor H152 through acoupling capacitor C156. While the local oscillator voltage
is
injected
to
the emitter
of
H152 through a capacitor C157,
both
AM
signals
and
oscillating voltage
are
mixed at the base-emitter junction
and
converted into 455KHz intermediate frequency. The
resulting IF signal
is
applied
to
the
first
IF transformer L153 consisting
of
one ceramic
filter
and
two
tuned circuits.
The
output
of
L153
is
led
to
the transistor H153 which in
turn
apply its
output
to
the
transistor
of
next
stage
H154. The
fully
amplified IF
output
is
then applied
to
the diode H157
to
detect audible signal through the detector transformer L154. The detected audio signal
is
filtered and amplified and the final audio
output
is
obtained
from
the collector
of
H155
and
applied
to
the
TAPE
OUT
jacks and the function switch.
The
DC
component
of
the detected IF signal
is
used
as
a AGC voltage
to
control emitter
2
-----------·~
current
of
H153 which in
turn
control the bias current
of
the RF amplifier through the resistor
R179 and R151. A
part
of
IF signal
output
is
also applied
to
the diode H158 through a
capacitor C167 and rectified
to
obtain
DC
current
for
energizing the
AM
signal strength meter
M010.
2.1 Suggestions
for
AM
Tuner Trouble Shooting
Check
for
broken
AM
bar antenna, next
try
to
tune station by rotating fly-wheel tuning
knob
slowly and observe the
AM
signal strength meter whether
it
deflects
or
not
.
If
the signal strength
meter
gives
a deflection at
several
frequencies received, no failure may exist in the
stages
at
least
preceding final IF transformer L154. Next connect a oscilloscope
to
the pin terminal J162
or
J 157 and check
for
audio signals
with
the tuning meter deflected.
If
the signal strength meter
does
not
deflect, check the local oscillator circuit. Normal oscillating voltage
at
the
hot
end
of
the oscillator tuning capacitor
is
about 2
or
3 volts, varying
with
tuning capacitor position. When
measuring oscillating voltage
use
a
RF
VTVM,
no
circuit
tester
gives
correct indication.
If
the
local oscillator voltage
is
normal, check all voltage distribution in the
AM
circuits
by
using a
DC
VTVM
and compare
the
measured values
with
those given in the schematic diagram.
3. FM
TUNER
The FM Tuner section
of
Model 4430
is
divided
into
four
functional blocks: FM
Front
End,
IF
Amplifier
and Detector, Muting Control and MPX Stereo Decoding Circuit. FM signals
in-
duced by a FM antenna
are
led
to
FM antenna coil L101 through
ATTENUATOR
switch and a balun coil. These signals
are
then applied
to
the
FET
RF
amplifier
which
in
turn
applies its
output
to
the next
FET
Mixer H102 through the double tuned high selective circuits.
The
FET
Mixer convert its
input
signal into 10.7MHz intermediate frequency and amplifies
it
at
the
same
time. The H103
is
a local oscillator and its
output
is
injected
into
the source
of
the
FET
Mixer, the injection voltage
is
about 700mV. The 10.7MHz
front
end
output
is
led
to
the
next
IF
amplifier
unit
through a coaxial cable.
The IF amplifier
unit
consists
of
five
stages
of
IF amplifier and one
stage
of
AGC amplifier.
Three pieces
of
dual elements ceramic filters
are
also
used
to
obtain high selectivity,
four
stages
of
symmetrical diode limiters
are
also employed
for
the best
limiting
characteristics, improved
capture ratio and good
AM
suppression.
A part
of
FM
Front
End
output
is
applied
to
the AGC amplifier H201 and rectified its
output
is
fed back
to
the gate
of
FET
RF
amplifier
to
decrease the gain
with
increased signal strength.
The
IF
signal sufficiently amplified through every
stage
of
IF amplifier
is
finally
applied
to
the
transistor limiter. The detected audio
output
is
led
to
the
buffer
amplifier H208 and its buffer-
ed
output
is
led
to;
(a)
noise amplifier
H471
through resistor R471 and capacitor C471, (b)
OUADRADIAL
jack on the rear panel through resistor R484, (c) MPX stereo decoding
circuit
through R483.
3.1
Audio
Muting
and Stereo Mode Auto-Selecting
Circuit
The muting
circuit
consisting
of
all solid-state electrical switching
has
been incorporated in
the Model
4430.
Three inputs control the muting function. The
first
is
related
to
singal strength,
the second
to
the noise
condition
at the detector and the
third
is
derived
from
the
DC
com-
ponent
of
the detector output. These inputs
are
properly matrixed and gated
to
provide muting
free
from
noise and transients.
The
first
input
of
DC voltage obtained by rectifying a part
of
IF
output
signal
from
the H206
is
applied
to
the
base
of
H306
and
turns on it,
if
the
IF
output
is
greater than predetermined level
(muting threshold level).
When
the H306
is
turned on the H307
is
turned
off,
allowing the
emitter-collector resistance increasing and the collector voltage
rises
about 9V. The increased
collector voltage increases the gate bias voltage and turns on the switching
FET
H308, decreasing
the source-drain resistance
to
near zero ohm and allowing the audio signal applied
to
the source
to
flow
to
the center
of
38KHz switching transformer through the source-drain path.
When
the
input
signal
is
lower than predetermined level, the
DC
output
obtained
is
small and
can
not
turn
on the H306, thus the H306
keeps
its
turn-off
stage
and this makes H307
turn
on,
decreasing the collector voltage and turning
off
H308. Thus no audio signals
can
pass
through
the FET. This
is
the fundamental principle
of
the muting operation
but
for
more elaborate mut-
ing operation the second and the
third
inputs
are
necessary.
The second
input
is
used
to
protect the muting operation and MPX stereo beacon lamps
from
misoperation due
to
undesirable
noises.
The high frequency noises included in the detected
audio signals
are
separated
by
a small capacitor
C471
and amplified by the noise amplifier tran-
sistor H471
and
its
output
is
rectified
by
the
two
diodes. The rectified
DC
output
is
proportional
to
the
noise components in the audio signals.
When there are excessive
noises
in the audio signals
such
as
obtained
with
a station incorrectly
tuned in,
the
rectified
DC
output
turns on the transistor H472, decreasing the emitter-collector
resistance
to
zero. This
means
the collector
of
H307
is
short-circuited
to
the ground, therefore
the H308
is
turned
off
and any audio signals having
excessive
high frequency
noises
can
not
go
through
the
FET's source-drain path.
The transistor H303 connected in
series
with
the 19KHz
pilot
signal amplifier transistor H302
is
also turned
off
(when the transistor H472
or
H307
are
turned on.) and no current flows
in
the
H302, resulting
in
turning
off
the
stereo beacon lamps. Thus misoperation due
to
undesirable
noises
is
also avoided.
The
third
input
is
obtained
from
the
FM
discriminator circuit. The
DC
output
so
called
"S"
curve is applied
to
the gate
of
H478 through a resistor R273 and
dividing
network (R485 &
R486). The
DC
output
is
zero
with
a station correctly tuned in,
but
will
vary
from
negative
to
positive values
or
vice
versa
when the tuning
point
is
deviated toward either plus
or
minus
frequency
from
the correct tuning frequency.
When the
DC
output
is
increased
to
a greater level than
that
of
predetermined, the increased
source potential
of
H478
makes
the transistor H481
turn
on, and this makes the H306
turn
off,
... H307
turn
on, ... H308
turn
off,
... H303
turn
off
(this
means
rio 19KHz
pilot
signal
is
amplified and
no
stereo beacon
is
turned on.).
When
the
DC
output
is
increased
to
the negative
predetermined level,
the
decreased
source potential turns
off
the H479 which in
turn
makes
the
H480
turn
on and
the
H306 in turned
off.
The subsequent
changes
are
exactly the
same
as
that
just described above.
Thus when the tuning
is
shifted-or-deviated
to
the certain frequencies in which undesirable
noisy side-audio signals
are
produced, both muting and 19KHz switching transistors
are
operated
automatically and open
the
circuits.
With the station correctly tuned in, the
bias
current
of
the FET H478
is
adjusted
so
that
both
transistor H480 and H481
are
not
turned on, giving no effect on the transistor H306.
3.2 MPX Stereo Decoding
Circuit
The buffered and non-equalized audio signals
are
applied
to
the
first
amplifier H301 which
serve
as
a tuned amplifier
for
the
pilot
signal in the composite signals and
as
a
buffer
amplifier
for
the audio signals. The amplified 19KHz
pilot
signal
is
led
to
the second 19KHz amplifier H302
and
further
amplified
if
switching transistor H303
is
turned on
by
the controlling
DC
signal
as
described in the preceding chapter. The final 19KHz
pilot
signal
is
rectified
by
the doubler
circuit
consisting
of
the
H315 and H316
to
obtain synchronized
38KHz
amplifier driving signal.
The H304
is
the
38KHz
tuned amplifier
and
supplies its
output
to
the switching
matrix
circuit
consisting
of
four
diodes. While the composite signals
are
applied
to
the center tap
of
switching
transformer
1I2
L302. The right and
left
stereo signals decoded
by
the switching
circuit
are
led
to
the crosstalk cancelling amplifier which utilizes complementary configuration
with
NPN and
PNP
transistors through de-emphasis network consisting
of
C315
and
R335, and C316 and R336,
L305
is
a
low
-
pass
filter
networks having very sharp
cut
off
characteristics and eliminates unde-
sirable residual switching signals. Transistors H313 and H314
are
buffer
amplifiers and their
outputs
are
led
to
the function switch.
3
4
...
-...
a.--•~
3.3 Suggestion
for
Trouble Shooting
of
FM
Tuner
~
·
3.3.1 Symptom: No
FM
Reception
First turn on the power switch
and
try
to
tune
FM
stations. Rotate the fly-wheel tuning
knob slowly
and
observe the
FM
signal
strength meter.
If
the
signal
strength meter deflect at
several
frequencies received, the tuner circuits preceding the discriminator circuit may
have
no
failure.
When
no reading
is
obtained
in
the meter, check
FM
local oscillator circuit, using a
RF
VTVM.
The normal local oscillator voltage
is
one
or
two
volts (rms) at the tuning capacitor,
depending on the tuning capacitor position.
If
the local oscillator voltage
is
normal,
next
check
all voltage distribution in the
FM
Front
End
and
IF amplifier
unit
and
compare them
with
those
shown
in
the circuit diagram.
When
signal
strength meter deflects
but
no sound
is
obtained,
check audio circuits, using high sensitive oscilloscope.
3.3.2 Symptom: No Stereo Separation
First check the
"MONO"
switch
is
in normal
out
position. Connect a
FM
RF
signal
generator
output
modulated by a stereo modulator
to
the
rear
FM
ANTENNA
terminals,
and
check the
stereo beacon
is
turned on
or
not.
If
not turned on, check
for
19KHz
pilot
signal
and
38KHz
switching signal, using
an
oscilloscope.
4.
PHONO
AND
PRE-AMPLIFIER
Signals from the PHONO jacks
are
applied
to
the phono amplifier mounted on P700. The
amplified
and
RIAA
equalized phono
signals
and
signals
from the tuner section
and
the TAPE,
AUX1, AUX2, jacks
are
applied
to
the selector switch which, in turn,
leads
the selected signals
to
the TAPE OUT jacks
and
mode switch.
Applied
to
the other section
of
the TAPE MON switch
are
signals
from the TAPE IN jacks.
The TAPE MON switch selects the
signals
from the mode switch or those from the TAPE IN
jacks
and
the selected
signals
go
to
the pre-amplifier.
Signals
are
then mode
processed
by the
mode switch
and
its associated circuit and applied
to
the tone control amplifier through the
volume control. The
bass
and
treble controlled
signals
from the tone control amplifier
pass
through the balance control section
and
the hi-filter before they
reach
the main amplifier.
4.1 Mode Switch
Mode switch S005
has
positions
of
MONO, 2
CH,
DISCRETE,
VARI-MATRIX,
and
SQ
DECODER.
In the MONO position, all
input
signals
are
mixed together
and
delivered
to
all
four
channels.
In the 2
CH
position,
each
pair
of
input
signals
right-front (RF)
and
right-rear (RR),
and
left-front (LF)
and
left-rear (LR)
are
mixed together. The resultant
signals
(RF +
RR)
and
(LF
+LR)
are
delivered
to
the pairs
of
RF
and
RR,
and
LF
and
LR channels, respectively.
In the DISCRETE position,
each
channel
signal
is
separately routed
to
the corresponding
channel.
In the
VARI-MATRIX
position, 2-channel stereo input
signals
are
converted
into
quadra-
phonic
signals
through the vari-matrix circuit; the input right
and
left
channel signals
are
fed
directly
to
the LF
and
RF
channels, while the
signals
to
the LR
and
RR
channels
are
synthesized
from the 2-channel
input
signals
under the control
of
the dimension control. The LR
and
RR
channel
signal
components
are
controlled by the dimension control
as
shown below.
Dimension Control Setting LR
Output
RR
Output
Minimum
(FCCW)
LF
+RF
RF+
LF
Center LF
RF
Maximum (FCW)
j_
LF-
RF
RF-
LF
When
the dimension control
is
set
to
the minimum position the LR
and
RR
channel
signals
-
become monophonic,
to
the center
are
stereophonic, and
to
the maximum
are
out
of
phase,
thus
providing vanished sound
image
positioning.
In the _
SQ
DECODER position, signal sources encoded by the
CBS
SQ
system
are
ideally
decoded
into
4-channel signals. Required
for
this operation
is
incorporation
of
the
SQ
Adaptor,
Model SQA-1,
into
the Model 4430.
4.2 Balance Control
Signals
from
the tone
wntrol
amplifiers
are
fed
into
the balance control circuit, in which the
signals
are
controlled by three balancers: FRONT L-R, REAR L-R,
and
FRONT-REAR. By
setting the FRONT-REAR balancer
to
the
"FRONT"
side
and
the
FRONT
L-R balancer
to
the
"L"
side,
for
example,
only
the
front
left
channel
is
drived.
The balance control
circuit
is
provided
with
the remote control switch which makes the
Model
RC-4
Remote Control Box operative when
set
to
the
"RE
MOTE"
position. In the
"REMOTE"
position the balancers
on
the Model 4430 become ineffective since signals
are
led
to
the Model
RC-4.
The volume level
can
be
adjusted by the volume control either on the Model
4430
or
Model
RC-4.
However, the maximum volume level available by adjustment
of
the Model
RC-4
is
determined by the volume control on the Model 4430.
Balance controlled signals
are
led
through the hi
filter
to
the main amplifier section
for
further
power amplification.
5.
POWER
AMPLIFIER
Differential amplifier consists
of
the transistors H601 and H603
to
provide satisfactory
D.C.
stability.
The transistor H605 drives the inverter transistors H611
and
H613 which, in turn, drive the
power
stage
consisting
of
H001
and
H002. Transistors H607
and
H609
are
current
limiter
operating
as
a power transistor protection circuit.
Excessive current
flow
in the power
output
stage
is
detected by the resistors R642 and R644
and
the resultantvariation
is
applied
to
the transistors H607
and
H609
and
make them turned on.
This
decreases
the
base
biasing current
for
H611
and
H613. In this way the current
flow
in the
power
output
stage
(H001 and H002)
is
restricted
within
a
safe
predetermined value.
6.
POWER SUPPLY
UNIT
The power supply
unit
consisting
of
transistors H805
and
H806, which operates
as
an
auto-
matic voltage regulator provides +35V
DC
to
all
of
the audio amplifiers except power amplifiers,
and
H803 which operates
as
the voltage regulator provides +14V
DC
to
the tuner section,
and
H808, H809 and H810 which operates
as
the speaker protector
to
relay circuit.
7.
AUDIO
TROUBLE
ANALYSIS
1.
Excessive line consumption
2.
No line consumption
or
zero
bias
3.
Excessive hum
and
noise level
4.
Parastic oscillation
a.
Check
for
shorted rectifiers H851 through
H854.
b.
Check
for
shorted transistors H001 through
HOOS.
c.
Check L003
for
short.
a.
Check line cord,
fuse,
shorted H581 & H582,
H626 & H627.
b.
Check
for
open rectifiers H851 through H854,
or open L003.
a.
Check
filter
capacitors C006 through C009,
C605 & C606.
b.
Check
for
shorted transistor H805.
a.
Check
for
defective capacitors, C607, C608,
C619, C620,
C621
and
C622. 5
6
-----------·~
5.
Improper clipping
a.
Check
for
defective resistor, R662 & R663.
8.
TEST EQUIPMENT REQUIRED FOR SERVICING
Table 1 lists the test equipment required
for
servicing the Model 4430 Receiver.
Item Manufacturer
and
Model No.
AM
Signal Generator
Test Loop
FM
Signal Generator
Less
than 0.3% distortion
Stereo Modulator
Less
than
0.3%
distortion
Audio
Oscillator
Weston
Model CV0-100P,
less
than 0.02% residual distortion
is
required.
Oscilloscope High sensitivity
with
DC
hori-
zontal
and
vertical amplifiers.
VTVM
With AC,
DC,
RF
range
Circuit Tester
AC Wattmeter Simpson, Model 390
AC Ammeter Commercial Grade (1-10A)
Line Voltmeter Commercial Grade
(0-150V AC)
Variable Autotransformer Powerstat, Model 116B
(0-140V AC, 10 amps)
Shorting Plug
Use
phono plug
with
600
ohm
across
center pin
and
shell.
Output
Load Commercial Grade
(8 ohms,±1% 1
OOW)
Output
Load Commercial Grade
(4 ohms, ±1% 1
OOW)
Use
Signal source
for
AM
align-
ment.
Used
with
AM
Signal
gen-
erator.
Signal source
for
FM align-
ment.
Stereo separation alignment
and
trouble shooting.
Sinewave
and
squarewave
sig-
nal
source.
Waveform analysis
and
trouble
shooting
and
ASO alignment.
Voltage measurements.
Trouble shooting.
Monitors primary power
to
Amplifier.
Monitorsamplifier
output
un-
der short
circuit
condition.
Monitorspotential
of
primary
power
to
amplifier.
Adjusts level
of
primary
power
to
amplifier.
Shorts amplifier
input
to
eliminate noise pickup.
Provides 8-ohm load
for
amplifier
output
termination.
Provides 4-ohm load
for
amplifier
output
termination.
Table
1
Test
Equipment
Required
for
Servicing
9.
AM
ALIGNMENT
PROCEDURE
9.1
AM
IF
Alignment
1. Connect a
sweep
generator
to
the J
151
and
an
alignment
scope
to
the J162.
2.
Rotate
each
core
of
IF transformer L153
and
L154
for
maximum height
and
flat
top
sym-
metrical
response.
•
-
j
9.2
AM
Frequency
Range
and Tracking Alignment
1.
Set AM signal generator
to
525KHz.
Turn the tuning capacitor
fully
closed (place the
tuning pointer atthe
low
end.)
and
adjust the oscillator coil L152
for
maximum audio output.
2.
Set the signal generator
to
1650KHz.
Place
the tuning pointer in the high frequency
end
and adjust the oscillator
trimmer
on
the oscillator tuning capacitor
for
maximum audio
output.
3.
Repeat the step 1
and
2
until
no further adjustment
is
necessary.
4.
Set the generator
to
600KHz
and
tune the receiver
to
the
same
frequency
and
adjust a slug
core
of
AM ferrite rod antenna
and
RF
coil L
151
for
maximum output.
5.
Set the generator
to
1400KHz
and
tune the receiver
to
the
same
frequency
and
acijust both
trimming
capacitors
of
antenna
and
RF
tuned
circuit
for
maximum output.
6.
Repeat the step 4
and
5
until
no further adjustment
is
necessary.
Note: During tracking alignment reduce the signal generator
output
as
necessary
to
avoid AGC
action.
10. FM
ALIGNMENT
PROCEDURE
1.
Connect a FM signal generator
to
the FM
ANTENNA
terminals and a oscilloscope
and
an
audio distortion analyzer
to
the TAPE OUTPUT jacks on the rear panel.
2.
Set the
FM
SG
to
87.5MHz
and
provide about 3
to
5µV.
Place
the tuning pointer at the
low
frequency
end
by rotating the tuning knob
and
adjust the core
of
oscillator coil L104
to
obtain maximum audio output.
3.
Set the FM
SG
to
108.5MHz
and
provide about 3
to
5µV output. Rotate the tuning knob
and place the tuning pointer at the high frequency
end
and
adjust the
trimming
capacitor
C106
for
maximum output.
4.
Repeat the step 2
and
3
until
no further adjustment
is
necessary.
5.
Set the FM
SG
to
90MHz
and
tune the receiver
to
the
same
frequency.
Decrease
signal
generator
output
until
the audio
output
level
decreases
with
the decreasing generator output.
Adjustthe
antenna coil L101,
RF
coil
L102andL103
and
IF transformer L105
for
minimum
audio distortion.
6.
Setthe
FM
SG
to
106MHz
and
tune the receiver
to
the
same
frequency.
Adjustthe
trimming
capacitor C102, C104
and
C105
for
minimum distortion.
7.
Adjust the secondary core(upper)of discriminator transformer L201
so
that
the center tuning
meter pointer indicates its center at no signal applied. Set the FM
SG
to
98MHz and increase
its
output
level
to
1
KµV
and tune the receiver
to
the
same
frequency
so
that
the center
tuning meter pointer indicates its center. Adjust the primary core (lower)
of
L201
for
minimum distortion.
10.1 Stereo Separation Alignment
1.
Set the
FM
SG
to
provide 1Kµ V at 98M
Hz.
Tune the receiver
to
the
same
frequency
so
that
the center tuning meter pointer indicates its center.
2.
Modulate the FM
SG
with
stereo composite signal consisting
of
only
subchannel signal
(of
course a
pilot
signal must
be
included). Adjust the core
of
L301
for
maximum audio
output.
then, modulate the signal generator
with
astereocomposite signal consisting
of
only
L channel
signal and
again
adjust the core
of
L301
for
maximum audio output.
3.
Adjust the
trimming
resistor R365
for
maximum
and
same
separation in both channels.
10.2 Muting
Circuit
Alignment
1.
Connect a
VTVM
across
the resistor R487 and adjust the resistor R487
until
the meter
reads
0.
75V
DC
at no signal.
2.
Set the FM
SG
to
provide 1 KµV at 98MHz and tune the receiver
to
the
same
frequency
correctly.
7
8
-----
----
.-.•-:.-.
3. Turn on MUTING pushswitch.
Shift
the
FM
signal generator frequency
to
plus
and
minus
and
note both plus
and
minus shifted frequencies at which undesirable audio
side
responses
are
muted out. Adjust the R487
so
that
the
same
shifted frequencies mute the undesirable
side
response.
11.
AUDIO ADJUSTMENT
1.
Connect a
VTVM
to J613(+)
and
J629(-)
and
adjust the trimming resistor R628 until the
VTVM
reads
10mV
DC.
For the other channel connect the
VTVM
to
J614(+)
and
J630(-)
and adjust the R629
for
the
same
reading.
2.
Connect a
VTVM
to
J629(+)
and
J623(-)
and
adjust the trimming resistor R613
until
the
VTVM
reads
OV
DC.
For the other channel connect the
VTVM
to
J630(+) and
J624(-)
and adjust the R614
until
the
VTVM
reads
OV
DC.
12.
AUTOMATIC VOLTAGE REGULATOR ADJUSTMENT
Connect a
VTVM
to
J802(+)
and
J820(-)
and
adjust R809
until
the
VTVM
reads
35 V
under no
signal
condition.
START
POINTER
Figure
1.
Dial
Stringing
S002-1
M010 S002-2 M009 S002-4 R905 R907 R906
S551-1
S551-2 Tuning Knob S551-4
-0
··••
I·~·-\~
t
......
R012 S004 R767 R768 S551-3 R013 S007
Figure
2.
Front
Panel
Adjustment
and
Component
Locations
Figure
3.
Main
Chassis
Component
Locations
(Top
View)
9
·o
-----------·~
J012
J014
J029
J013
J015
J030
W001
J019
P58Q----;..,=--
C006-__,..=-
J020
R004
J010
J001
JOOS
S001
J016
I
J002
J011
J009 J007
Figure
4.
Rear
Panel
Adjustment
and
Component
Locations
P500
P400
---;?---P580
5--=---coos
Figure
5.
Main
Chassis
Component
Locations
(Bottom
View)
-
Figure
6.
FM
Front
End
Assembly
PtDO
Ci>mponent
Locations
Figure
7.
AM
Tuner
Assembly
P150
Component
Locations
11
-----------·~
(&
"'
c
Q
·.;::::
ra
~
Q
.....
.....
c
Q.I
c
Q
CL
E
Q
(.)
=
=
N
a.
>
::i5
E
Q.I
"'
"'
C(
...
Q.I
t§
CL
E
C(
u..
:a:
u..
cci
!
=
en
i.i:
12
Figure
9.
MPX
Stereo
Decoding
Amplifier
Assembly
P300
Component
Locations
Figure
10.
Pre,
Tone
Amplifier
Assembly
P400
Component
Locations
13
-----------·~
Figure
11.
Noise
and
DC
Amplifier
P470
Component
locations
14
Figure
12.
Vari-Matrix
Unit
Assembly
P500
Component
Locations
Figure
14.
Temperature
Compensation
Unit
Assembly
P580
Component
Locations
Figure
13.
Loudness,
Hi-Filter
and
Speaker
Switch
Unit
Assembly
P550
Component
Locations
15
(o)
-It--
cl:.
' •
cl:.
' •
c!::.
'
c!::.
'
c!::.
'
c!::.
f '
db
; •d:o
J6
(0
J614
J6f6
'
J612
J630
J620
J618
J622
.
J628
....
R628
~
H
627
~
~
& I & .
~
~
J617
J619
J629
J61
I
J6
r'
5
J613
J607
9P
C605
+
.....
Figure
15.
Power
Amplifier
Assembly
P600
Component
Locations
C705
--n-
+
......
C703
•
Figure
16.
Phono
Amplifier
Assembly
P700
Component
Locations
H G
I::
.
E:
c
Figure
17.
Tone
Control
Unit
Assembly
P750
Component
Locations
17
CXl
~
c!:::JID
...,
~
(X)
...,
c!:::J
\ ;:::
~
J802
·~815
co
iii
~814
~i
~
ft·+
Jr
w·06oHOOS
:
crr
7
1
~
1:
~
.
...
TT
~3
- 0
~loo
CX>
C!!.,..o,...,'-....._
./
gi
iii
(ii =
u u
(X)
8·
::c
C808
-0
~
-0
-0
~
-0
J804
J803
J820
J819
J805
J806
m
c+Jg
...,
-
ce:i
a;
....,
r<>
c;::i
iii
....,
N
c;::i
iii
....,
<t
c+Jeii
...,
Figure
18.
Power
Supply
Unit
Assembly
PBOO
Component
Locations
c!::J
J 9 o 3
c!!!:}
9 O7
c!::J
J
9o1
c!::J
J 9 o 5
c!::J
c:!::J
'
~
~
(
e--l\NVlr--e
J909
R902
R901
C"..::l
c::-1
...
,I
db
db
+ •
db
!Jss4
AC
J85
,1
J856
J855
~
0
.
··
~
.
H852
()
J853
AC
qp
c;:
H'
853
I )
H851
J852
qp
<:::
Figure
19.
AC
Rectifier
Assembly
P850
Component
Locations
J
904
J906 J902
c!::J
db
c!::J
~
:S:TVIAR
Figure
20.
Balance
Control
Unit
Assembly
P900
Component
Locations
•
'"'
0
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