Marantz SR620 User manual

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MARANTZ DESIGN AND SERVICE
Using
superior
design
and
selected
high
grade
components,
MARANTZ
Company
has
created
the
ultimate
in
stereo
sound.
Only
original
MARANTZ
parts
can
insure
that
your
MARANTZ
product
will
continue
to
perform
to
the
specifications
for
which
it is
famous.
Parts
for
your
MARANTZ
stereo
are
generally
available
within
72
hours
throughout
the
nation
via
a
toll-free
line
to
our
National
Parts
Depot
in
California.
The
sales
professionals
who
take
your
call
immediately
refer
to
their
own
desk
top
com-
.
puter
terminal
and
can
quickly
determine
the
availability
and
price
information
you
require.
If,
for
some
reason,
your
order
should
exceed
our
available
stock,
we
usually
can
instantly
provide
an
alternate
replacement
part
or
current
delivery
infor-
mation.
When
the
order
is
placed
and
confirmed,
the
computer
simultaneously
generates
‘‘hard
copy’’
orders
at
the
distribu-
tion
center.
As
hard
copies
come
directly
from
the
computer
to
the
national
parts
depot,
your
requested
stock
is
assembled
and
prepared
for
shipment
and
placed on
the
first available
carrier
for
delivery to you.
ORDERING PARTS
Phone orders will eliminate mail delays, and we encourage the use of this method. If you order by mail, use MARANTZ parts
order froms which are available from our National Parts Depot located at the following address:
SUPERSCOPE NATIONAL PARTS DEPARTMENT
20525 Nordhoff Street
Chatsworth, California 91311
Phone: [phone]
1-213-998-9333
oa
The following information must be supplied to eliminate delays in processing your order:
. Complete address.
. Complete part numbers.
. Complete description of parts.
. Model number for which part is required (indicate MARANTZ).
. Account number (for account customers only).
ahwon
Direct
consumers
will
be
provided
with
the
current
retail
price
quotation
on
available
parts
in
order
to
advise
them
of
the
cost
of
the
parts
and
shipping.
OVERSEAS PARTS ORDERING
Parts may also be ordered from the following overseas addresses:
U.S.A. CANADA AUSTRALIA JAPAN
MARANTZ
COMPANY,
INC.
SUPERSCOPE
CANADA,
LTD.
MARANTZ
AUSTRALIA
MARANTZ
JAPAN,
INC.
National
Service
Dept.
3710
Nashua
Drive
32
Cross
Street
3622
Kamitsuruma
P.O.
Box
577
Mississauga
Brookvale,
NSW
2100
Sagamihara-shi
Chatsworth,
CA
91311
Ontario,
Canada
L4V1M5
Australia
Kanagawa,
Japan
U.S.A.
EUROPE
MARANTZ
S.A.
MARANTZ
AUDIO
U.K.
LTD.
MARANTZ
BELGIUM
MARANTZ
SVENSKA
A.B.
326
Avenue
Louise
Bte
32
Unit
15/16
45
Rue
Auguste
Van
Zande
Svartviksvangen
56
1050 Brussels Saxon Way Industrial Estate 1080 Brussels Traneberg
Belgium Motor Lane Belgium Box 12016
Harmondsworth
UB7
OLW
161
12
BROMMA
Great Britain SWEDEN
MARANTZ
GERMANY
GMBH
MARANTZ
FRANCE
MARANTZ
GMBH
AUSTRIA
,
Max-Planckstrasse 22 4 Rue Bernard Palissy Wiedner Hauptstrasse 98
6072 Dreieich 1 92600 Asnieres 1050 WIEN
West Germany France AUSTRIA
MARANTZ
NORSKE
A.S.
MARANTZ
DENMARK
e
Refstadalieen 13 Bregnerddvej 132b
Oslo 5 3460 BIRKER@D
Norway DENMARK
All
of
the
above
locations
are
fully
equipped
to
take
care
of
your
total
service
needs.
Because
various
countries
have
differing
configuration
requirements,
it
is
necessary
that
you
contact
the
service
facility
in
your
particular
country.
In
the
event
that
there
is
no
service
location
listed
for
your
country,
please
contact
the
nearest
facility
for
the
necessary
assistance.
ERR eR B°ecn ERE ZZ’

TABLE OF CONTENTS
Section
Page
INTRODUCTION?
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1.
SHOCK
FIRE
HAZARD
SERVICE
TEST
.......
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2:
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BOARDS
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1
3.
TEST EQUIPMENT
REQUIRED
FOR
SERVICING
.....
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4.
TUNER
ALIGNMENT
PROCEDURES
.........
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2
4.1
FM
Alignment
Procedures
.
2...
2.
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2
4.2 Multiplex Alignment Procedures . 2... 2... ee eet eee 3
4.3 AM Alignment Procedures ... 2... 0. ee ee ee ee eee ee ee 3
5.
ALIGNMENT
POUNT.
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ed
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5
6.
CX
CIRCUIT
ALIGNMENT
AND
MEASUREMENT
PROCEDURE
.............
0.02
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5
7.
VOLTAGE
CONVERSION
..
1...
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6
8.
<CIRCUIT
DESCRIPTION
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DIAGRAM:
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dS 20
10.
SCHEMATIC
DIAGRAM
AND
COMPONENT
LOCATIONS
.......
0.
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cee
ee
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23
10.1
U-COM
Assembly
(P501)
Schematic
Diagram
and
Component
Location
.........-.---+--5
200
ees
23
10.2
Scan
Step
Assembly
(P504)
Schematic
Diagram
and
Component
Location
(SR620/SR520)
...........
23
10.3.
Display
Assembly
(P502)
Schematic
Diagram
and
Component
Location
.........-....-+++e0-05-
24
10.4
Key
Switch
Assembly
(P503)
Schematic
Diagram
and
Component
Location............---++-.++-:
24
10.5
Tuner/Phono
Assembly
(P100)
Schematic
Diagram
and
Component
Location
(SR620/SR620L)........
26
10.6 Speaker Switch Headphone Assembly (PTO0) Schematic Diagram and Component Location(SR620/SR620L). 26
10.7 Speaker Terminal Assembly (PW00) Schematic Diagram and Component Location (SR620/SR620L)..... 27
10.8 Power Switch Assembly (PU00) Schematic Diagram and Component Location (SR620/SR620L) ....... 28
10.9
Volume/Balance
Assembly
(PGOO)
Schematic
Diagram
and
Component
Location
(SR620/SR620L)......
29
10.10
Tape
2
Monitor
Assembly
(PV00)
Schematic
Diagram
and
Component
Location
(SR620/SR620L)
......
29
10.11
Tone
Amp.
Assembly
(PE00)
Schematic
Diagram
and
Component
Location
(SR620/SR620L)
.........
30
10.12
DE-Emphasis
Switch
Assembly
(PC50)
Schematic
Diagram
and
Component
Location
(SR620
ONLY)
....
30
10.13
Main/Power
Supply
Assembly
(P700)
Schematic
Diagram
and
Component
Location
(SR620/SR620L)...
31
10.14
CX
Control
Assembly
(PD00)
Schematic
Diagram
and
Component
Location
(SR620
ONLY)
..........
32
10.15
CX
Switch
Assembly
(PD50)
Schematic
Diagram
and
Component
Location
(SR620
ONLY)
........-..
32
10.16
CAL.
L.E.D.
Assembly
(PZ00)
Schematic
Diagram
and
Component
Location
(SR620
ONLY).......--.
33
10.17
IND.
L.E.D.
Assembly
(PZ51)
Schematic
Diagram
and
Component
Location
(SR620
ONLY)
........-.
33
10.18
Tuner/Phono
Assembly
(P100)
Schematic
Diagram
and
Component
Location
(SR520/SR520L)
........
34
10.19
Speaker
Switch
Headphone
Assembly
(PT00)
Schematic
Diagram
and
Component
Location(SR520/SR520L)
.
34
10.20
Speaker
Terminal
Assembly
(PWOO)
Schematic
Diagram
and
Component
Location
(SR520/SR520L)
....
35
10.21
Power
Switch
Assembly
(PU0O)
Schematic
Diagram
and
Component
Location
(SR520/SR520L)
.......
36
10.22
Volume/Balance
Assembly
(PGOO)
Schematic
Diagram
and
Component
Location
(SR520/SR520L)......
37
10.23
Tone
Amp.
Assembly
(PE00)
Schematic
Diagram
and
Component
Location
(SR520/SR520L)
.........
38
10.24
DE-Emphasis
Switch
Assembly
(PC50)
Schematic
Diagram
and
Component
Location
(SR520
ONLY)
....
38
10.25
Main/Power
Supply
Assembly
(P700)
Schematic
Diagram
and
Component
Location
(SR520/SR520L)
.
. .
39
11. EXPLODED VIEW AND PARTS LIST ........... 0.0... eee cee ee ce ene eee 40
12.. -ECECTRICAL: PARTS UIST secceciced sh ee Se Se eS ig, Be ee PR Od See RO 49
13. TECHNICAL SPECIFICATIONS ~ ..... 2... ee eee eee 60
14.
SCHEMATIC DIAGRAM. | nse 2 bi wane ened ie 8 Se Oe EI a eee Pas 65

MODEL SR620/SR620L STEREOPHONIC RECEIVER
MODEL SR620CX STEREOPHONIC RECEIVER
MODEL SR520/SR520L STEREOPHONIC RECEIVER
INTRODUCTION
This service manual was prepared for use by Authorized
Warranty Stations and contains service information for
Marantz Model SR520/SR520L and SR620/SR620L
Stereophonic Receiver.
Servicing information and voltage data included in this
manual are intended for use by the knowledgeable and ex-
perienced technician only. All instructions should be read
carefully. No attempt should be made to proceed without
a good understanding of the operation of the Receiver.
The parts list furnishes information by which replacement
parts may be ordered from the Marantz Company. A
simple description is included for parts which can usually
be obtained through local suppliers.
1. SHOCK FIRE HAZARD SERVICE TEST
CAUTION: After servicing this appliance and prior to
returning to customer, measure the resistance between
either primary AC cord connector pins (with unit NOT
connected to AC mains and its Power switch ON), and
the face or front Panel of product and controls and cha-
ssis bottom.
Any resistance measurement less than 1 Megohms should
cause unit to be repaired or corrected before AC power is
applied, and verfied before return to user/customer.
Ref. UL Standard NO. 1270. Para. 66. 3. D (Mandatory
Test after servicing Electrical Appliances, effective 7-1-83).
2. P.W. BOARDS
As can be seen from the circuit diagram the chassis of
Model SR520/SR520L and SR620/SR620L consists of the
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. Tuner/Phono/Switch . . . .mounted on P.W. Board P100
2. Power Supply. ........ mounted on P.W. Board P700
3. Tone Amp. .........-- mounted on P.W. Board PEOO
4. Speaker Switch/
Headphone .......... mounted on P.W. Board PT00
5. Power Switch. ....... mounted on P.W. Board PUQO
6. Speaker Terminal ..... mounted on P.W. Board PW0O
7. Balance Control ...... mounted on P.W. Board PGOO
8. Tape 2 Monitor....... mounted on P.W. Board PV0O
(SR620/SR620L)
9. DE-Emphasis Switch . . . mounted on P.W. Board PC50
(SR620/SR520(E) SR620(P))
10. CX Control ........ mounted on P.W. Board PDOO
11. CX Switch. ........ mounted on P.W. Board PD50
12. CAL..LED acces 8 mounted on P.W. Board PZ00
13. Ind. LED. .......... mounted on P.W. Board PZ51
(SR620(U))
14. UCOM............ mounted on P.W. Board P501
15. Display ............ mounted on P.W. Board P502
16. Key Switch ......... mounted on P.W. Board P503
17. Scan Switch. ........ mounted on P.W. Board P504
(SR620/SR520)

Item
3. TEST EQUIPMENT REQUIRED FOR SERVICING
Use
This table lists the test equipment required for servicing the Model SR620/SR620L/SR520/SR520L Stereophonic Receiver.
AM Signal Generator
Signal source for AM alignment
Test Loop
Use with AM Signal Generator
FM Signal Generator
MPX Signal Generator
Signal source for FM alignment
Stereo separation alignment and trouble shooting
Distortion Analyzer
Audio Oscillator
AC VTVM
Distortion measurements
Sinewave and squarewave signal source
Voltage measurements (AC)
Oscilloscope
Waveform analysis and trouble shooting
Frequency Counter
MPX Oscillator adjustment (VCO)
Circuit Tester
Trouble shooting
DC VTVM
Voltage measurements (DC)
AC Wattmeter
Monitors primary power to tuner
Line Voltmeter
Monitors potential of primary power to tuner
Variable Autotransformer
DC Didital Voltmeter
Adjusts level of primary power to tuner
Adjust the DC offset of main amplifier output. (SR620/SR620L)
4. TUNER ALIGNMENT PROCEDURES
A dummy resistor of 47 kohms must be connected across the tuner output terminals before alignment.
4.1 FM Alignment Procedures (Selector switch in the ‘‘FM” position, Mode switch in the MONO Position.)
AUTO/MANU Switch in the “MANU” Position (SR620/SR620L)
1. FM RF Alignment
Signal Source
Connection
Signal
Frequency
Indicator
Connection
Set the Digital
Readout Frequency
Adjust:
RF generator to FM antenna
terminals through matching
network (300 ohms, balanced)
Maintain RF level below
limit.
VTVMto Lor R
channel output
(J110)
FRONT END IFT L8 for
maximum output and
distortion.
RF generator 71mV output
to FM antenna terminals
through matching network.
(300 ohms, balanced)
“O"' center meter or
DC current meter in
100A range between
(J117 and J118)
L101 core so that the
meter indicates its center
or may read ‘'O"’.
RF generator 1 mV output
to FM antenna terminals
through matching network.
(300 ohms, balanced)
Distortion meter to
Lor R channel
output (J110)
98.0 MHz
L102 core for minimum
distortion.
RF generator to 12.5uV
Distortion meter to
L or R Channei
Output (J110)
Turn R117 until output
is defeated, then re-adjust
R117-to the point where
output is obtained again.

4.2 Multiplex Alignment Procedures (Selector switch in the ““FM’’ position/Mode switch in the STEREO position)
Signal Source
Connection
Indicator
Connection
Signal
Frequency
Set the Digital
Readout Frequency
Adjust:
£
RF generator to FM antenna
terminals through matching
signal
network. with 1mV FM stereo
Frequency counter
98.0 MHz to (J119)
R312 so that frequency
may precisely read
76 kHz.
RF generator to FM antenna
terminals through matching
with 1mV FM stereo signal
Modulation level.
DIN 40kHz +8% pilot
SHF 67.5 kHz +9% pilot
network (300 ohms, balanced)
VTVMto Rorl
channel output
(5102)
98.0 MHz
tFT (A101) for minimum
distortion.
RF generator to FM antenna
terminals through matching
with 1mV FM stereo signal.
network (300 ohms, balanced)
VTVM to right
and left channel
output (J110)
Pilot only
R309 so that minimum
output should be the
same in both channels.
RF generator to FM antenna
terminals through matching
with 1mvV FM stereo signa!
Modulation level.
DIN 40kHz +8% pilot
IHF 67.5 kHz +9% pilot
network (300 ohms, balanced)
VTVM to right
channel output
(J110)
Stereo left
(1,000 Hz}
VTVM to left
channel! output
(J110)
Stereo right
(1,000 Hz)
4.3 AM Alignment Procedures
Repeat steps 4 and 5.
1. AM (MW) Local Oscillator Alignment
Signal Source
Connection
2. AM (MW) RF Alignment
Signal Source
Connection
Indicator
Connection
Signal
Frequency
Set the Digital
R338 for same separation
in both channels.
Adjust:
DC voltmeter in
3V range to
(5102)
Indicator
Connection
Signal
Frequency
Set the Digital
LAO1 for 1.5V.
Readout Frequency
Apply the signal to the
AM loop antenna from the
RF generator using the
test loop.
As per the Figure 1.
1,404 kHz 1,404 kHz
VTVMto Lor R
CAO5-1 for maximum
output.
————— channel output
603 kHz (J102) 603 kHz
3. AM IF Alignment
Signal Source
Connection
pn Erereerin, US 2 Se ee
LAO3 for maximum
output.
Repeat steps 1 and 2 as necessary to obtain maximum sensitivity.
Indicator
Connection
Signal
Frequency
Set the Digital
Readout Frequency
Adjust:
Sweep generator to
(J101 AM Ant)
Quiet point on
band
| 450 kHz Oscilloscope to ,
i (J111)
LAOS for maximum and
symmetric response.

4. LW Local Oscillator Alignment (Selector switch in the “LW” position) SR620L/SR520L
Signal Source Signal Indicator Set the Digital
Connection Frequency Connection Readout Frequency
Adjust:
DC voltmeter in
12V range to 153 kHz LAO2 for 3.0V.
(J102)
5. LW RF Alignment (Selector switch in the “LW” position} SR620L/SR520L
Signal Source Signal Indicator Set the Digital
. 5 Adjust:
Connection Frequency Connection Readout Frequency ;
Apply the signal! to the H kKH CAO5-2 for maximum
AM loop antenna from the S20 ie VTVM to Lor R B20'kHe output.
RF generator using the test channei output ~ =
loop. 170 kHz ($102) 170 kHz LA0O4 for maximum
As per the Figure 1. output.
Repeat steps 1 and 2 as necessary to obtain maximum sensitivity.
6. Main Amp. Aignment (Function switch in the “Aux" position)
Connect the digital voltmeter to the Speaker terminals (no-load condition) and adjust R709 (L. ch.) and R710 (R. ch.) for an
indication of 0 V. (Volume turned to minimum.)
Test Loop
AM Loop Antenna
©
2 60cm =
Figure 1. Application of AM Signal

ALIGNMENT POINTS
6. CX CIRCUIT ALIGNMENT AND MEASUREMENT PROCEDURE
6.1 Alignment Procedure
(a-1) Output Level Adjustment
1
3.
. Set the input VR (RD53) to mechanical center.
2.
Apply a 1 kHz sine wave signal to the Phono input
(appr. 4 mV).
Attenuate the input audio signal generator until both
CX CAL indicator LEDs (QZ01, QZ02) are out.
. Check the DC voltage between test points JDO5 (+)
and JDO6 (GND) at this time. Voltage must be 5 V
40.5V.
. Next, adjust the semi-fixed RD33 (L. ch.) and RD34
(R. ch.) for equal output level at TAPE OUT with the
CX switch (SD51) in ‘‘on” and “off’’ positions.
(a-2) DC Offset Adjustment
1
. After performing the adjustment described in a-1),
adjust the semi-fixed VR RD27 (L. ch.) for a DC voltage
reading of O V between test points JDO7 and JDO6,
with the CX switch (SD51) in the “on” position.
. In the seme way, adjust the semi-fixed RD28 (R. ch.)
for a DC voltage reading of 0 V between test points
JDO8 and JDO6G.
. Next, check the left channel DC voltage again, and
perform re-adjustment if a change has occured.
6.2 Measurement Procedure
Measurement of Input Vs. Output Level
. Apply a 1 kHz sine wave signal to the Phono input and
attenuate the input signal until both CX CAL LEDs are
out. {Input VR at mechanical center).
. Assume the TAPE OUTPUT level at this time to be OdB.
Next, attenuate the input signal by 10 dB.
. Measure the TAPE OUTPUT level at this time, and
confirm that it is -20 dB+5 dB.
. Next, attenuate the input signal to —30 dB (—10 dB
+ —20 dB total of —30 dB).
. Measure the TAPE OUTPUT level at this time, and
confirm that it is —50 dB+5 dB.
THD Measurement
. Apply a 1 kHz sine wave signal to the Phono input and
attenuate the input signal until both CX CAL LEDs are
out. (Input VR at mechanical center.)
. Next, raise the input signal level by 6 dB. At this time,
THD at the TAPE OUTPUT must measure 0.5% or
less.

7. VOLTAGE CONVERSION
To convert the unit to a different power source voltage, Voltage Conversion Chart
change the position as illustrated in the drawing below.
CAUTION
DISCONNECT POWER SUPPLY CORD FROM AC
OUTLET BEFORE CONVERTING VOLTAGE. DO
NOT DISASSEMBLE THE VOLTAGE SELECTOR
ABSOLUTELY. ‘eS
_I
240V ~ 220V ~ 240V ~ 120V ~
\ / 220V ~ \ / 110V~
(A)(N}(T) Version {E) (P) Version
NOTE ON SAFETY:
Symbol A\ Fire or electrical shock hazard. Only original parts
should be used to replace any part marked with symbol A\ .
Any other component substitution (other than original type),
may increase risk of fire or electrical shock hazard.
8. CIRCUIT DESCRIPTION
The Mode! SR620/SR620L/SR520/SR520L is an LW/MW/FM digital frequency-synthesized tuner using a PLL frequency
synthesizer designed for use in LW/MW/FM tuners in conjunction with a CMOS LSI controller.
8.1 LW/MW/FM Tuner PLL Frequency Synthesizer and Controller TC9147P (Q501)
@ Maximum Ratings (Ta = 25°C) Pin Gaunacsa
Characteristic Symbol Ratings tee pane
Supply Voltage Vop 0~6 ee : a seein
Input Voltage Vig —~0.3~ Vop +0.3 cree mpeg
a MANUAL 7 36D 1EST
Output
Voltage
[Your
03~Voot03
|
ee
Output Current (Note) lout 30 Sees sooiaes
ua a2 fstop2
bst0p3
30DE!
Power Dissipation Pp 800 m2
Operating Temperature Topr ~30~ 75 we
Storage Temperature Tstg ~55 ~ 125
(Note) Bipolar transistor output current. ie

® Block Diagram
AMiy PSC FMin TEST DO-1 DO-2 STOP1 STOP2 STOP3
PROGRAMMABLE
COUNTER
AUTO STOP
COUNTER
PROCESSING CIRCUIT
TIMING
GENERATING
CIRCUIT
PRESET MEMORY
(RAM)
ADDRESS
DECODER
REFERENCE
FREQUENCY DIVIDER
LAST FREQUENCY MEMORY
CONSTANT ROM
MULTIPLEXER
PRESET MEMORY
CONTROL
X'TAL BAND SELECTING
OSCI-
LLATER CONTROL
SCAN CONTROL
MANUAL AUTO UP DOWN