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:
"PW
BOARDS
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1
3.
TEST EQUIPMENT
REQUIRED
FOR
SERVICING
.....
0...
.
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2
4.
TUNER
ALIGNMENT
PROCEDURES
.........
0...
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nents
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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seers.
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tener
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ete
Bar
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EA
EAR
ed
sai
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dod
weiss
5
6.
CX
CIRCUIT
ALIGNMENT
AND
MEASUREMENT
PROCEDURE
.............
0.02
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eeuee
5
7.
VOLTAGE
CONVERSION
..
1...
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tees
6
8.
<CIRCUIT
DESCRIPTION
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9-
‘BLOCK:
DIAGRAM:
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A
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dS 20
10.
SCHEMATIC
DIAGRAM
AND
COMPONENT
LOCATIONS
.......
0.
0c
cee
ee
eee
eee
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

@ Electrical Characteristics (Unless otherwise specified, Ta= 25°C, Vpp =5.0V)
Test
Circuit
Characteristic Test Condition
Supply Voltage =
FM Band, fiy=4MHz,
No-Load
Memory Backup Voltage INH =0V
Vpp =5.0V, INH=0V
Vpp =2.0V, INH=0V
X‘tal
Oscillation
Frequency
=
Vin = 0.5 Vp-p,
AC coupled
fin =2.0 ~ 4.0MHz,
AC coupled
Vin =0.5 Vp-p,
AC coupled
fin =0.5 ~ 2.2 MHz,
AC coupled
Vin =0.5 Vp-p,
AC coupled
fin = 400 ~ 500 kHz,
AC coupled
Supply Current
Inhibit Supply Current
Operating Frequency
Input Amplitude
Operating Frequency
Input Amplitude
}
Operating Frequency
bt ot
Input Amplitude
FM. Propagation Delay
Time
tod
CL
=15pF,
Viy
=0.5
Vp-p
Max. Load Capacity CL
INH Input Voltae Lat Level
ees
npu
oltage
-———-——_}+—-
iNT a ae | Me" Level | Ving
Other All “H" Level
Input I/O | Input Voltage
Terminals “L" Level
ee
UP, DOWN, TEST Input Pull-Down
Resistance
FMin, AMin, STOP3 Feedback
Resistance
F1, 2, STOP1, 2, INH INT Input
Leak Current
—}..
“H" Level
Output Current on
"L'’ Level
OSC, MUTE (TC9147P: DATA, CK1, 2, 0/5)
“H™ Level
Output Current acy
L™ Level
DO-1, DO-2
“H" Level
Output Current 7
“L"™ Level
Try state Leak Current
MC1, MC2
“H" Level
Output Current —-
‘L” Level
Note: Parameters with * mark are guaranteed at all conditions of Vpp =4.5 ~ 5.5V, Ta=30 ~ 75°C.
8

@ Functional Explanation of Terminals
Terminal Name Function Remarks
2 Crystal Oscillator terminal | Connect a 7.2 MHz crystal for reference With a built in feed-
3 XT frequency. back resistor.
4 FM | FM band designating input .
5 | MW WW band designatinginous Mutual reset type for selecting FM/MW/LW A
4 bands.
6 LW LW band designating input
Manual tuning mode de- ;
7 MANUAL signating input Mutual reset type for selecting manual and
- 4 auto search operating modes at time of A
8 AUTO Auto search tuning mode UP/DOWN tuning.
designating input
9 UP Up operating key input For UP/DOWN tuning with the push key 2
10 DOWN | DOWN operating key input | Connected.
1 STO Memory store command The preset memory is set to write state by A
| input this input.
12 M1 Beas anaes ete In combination with MC1 and MC2 inputs,
2 2 dasidnating inotit controls write/read of the internal 16 chan- A
19 M8 g ane nel preset memory.
20 Mc1 Used for setting the 16 channel preset
Niéinory contiulangut memory either to FM/AM (MW+LW) 8 Cc
1 Mc2. ¥ channel fixed system or FM+MW+LW 3
bands 16 channel random system.
= pais aa aes eee SOE
E é C.R terminal for oscillator that decides
| | =
oe pete, BMoscilatorxermina SCAN speed at time of AM search.
: oat C.R terminal for oscillator that decides
| =
23 OSC1 FM oscillator termina SCANpeediat time oF FM search.
4 0/5 FM 50 kHz output for 50 kHz step output in FM band in European D
Europe region. Become “’H” fevel at 50 kHz.
25 CK2 Transmits serial data and timing clock to be
6 CK1 Receiving frequency data sent to Receiving Frequency Digital Display D
+ serial outputs Driver TD6301AP. CK1 output also serves
27 DATA for pee sound transmission.
28 MUTE Muting signal output This terminal is placed at H”’ level at time D
of muting output.
Region Designating output | For designating Japan, U.S.A. and Europe.
: : Stops auto search by counting 1F450 kHz
- |
31 STOP3 AM-IF signal input aignalat tinear AM. F
re sete Oetaral When a ‘“’H” level signal is input under the
32 STOP2 " ae Page state where a ‘‘H’’ level signa! is being given E
mpe to STOP1 Input, stops Auto search.
33 STOP1 SCAN speed: slow Input When a “‘H”’ level signal is input, reduce E
P auto search scan speed to 1/2.
34 DO-2 pasa Ganiparstoroutsit 2 try state buffers are transmitted para- G
35 DO-1 | Ilelly from one phase comparator.
36 TEST Test Termirial When a ‘‘H”’ level signal is input, this B
terminal is placed at test mode.
37 EM FM Programmable counter | Output from prescaler TD6104P is E
us input connected.
Controls selection of 1/30 and 1/32 division
|
38 PSC Prescaler control output of prescaler TD6104P. D

Terminal Name
Function Remarks
AM programmable counter
input
AM local oscillation signal is applied.
Inhibit input
Normal operation at ““H” level and inhibit
status at ‘’L”’ level.
Initialize input
Normal operation at “‘H’’ level, and internal
state is initialized at ‘’L’’ level.
Power terminals
@ {Input/Output Equivalent Circuit
A. Bipolar Transistor LED Driver Built-in 1/O.
Vpo
C. C-MOS I/O
E. C-MOS Input (without Pull-up. Pull-Down
Resistor)
ae
{—_
|
|. Bipolar Transistor LED Driver Output
G. Try-state Output
Voo
Apply 5+0.5V. Backup is possible up to
2V.
B. C-MOS Input with Pull-Down Resistor
D. C-MOS Output
4
F, With Built-in Input Amplifier
Re
pe
H. Nch MOS LED Driver Output
a
10

8.2 OUTLINE OF FUNCTIONS
@ Receiving Bands
1) FM/MW/LW bands can be received in European region and FM/AM bands in Japan and U.S.A.
2) AM band for U.S.A. is able to receive up to 1710 kHz, and 9kHz separation is also available.
Range of Receiving IF Frequency | Reference
Frequency ‘a Stop Frequency
Destination | Band Name Remarks
FM Europe 50 kHz sepa-
ration
|
MW | 522 ~ 1611 MHz +450 kHz | 9 kHz 9 kHz MW 9 kHz separation
LW 153 ~ 360 kHz +450 kHz 1 kHz 1 kHz 1 kHz separation
FM 87.5 ~ 108.0 MHz +10.7 MHz | 100 kHz 25 kHz FM U.S.A. band
MW U.S.A. 10 kHz separa-
tion
MW U.S.A. 9 kHz separa-
tion
76.0 ~ 90.0 MHz —10.7 MHz | 100 kHz 25 kHz FM JAPAN band
+
522 ~ 1611 kHz +450 kHz | 9 kHz 9 kHz MW 9 kHz separation
FM 37.50 ~ 108.00 MHz +10.7 MHz 50 kHz 25 kHz
520 ~ 1710 kHz +450 kHz 10 kHz 10 kHz
522 ~ 1710 kHz +450 kHz 9 kHz 9 kHz
8.3 EXPLANATION OF OPERATION
@ PLL Unit
1. Reference Frequency and Crystal Oscillator
Oscillation frequency from the crystal oscillator is divided to generate reference frequency of 25 kHz at time of FM, 9 or
10 kHz at MW and 1 kHz at LW.
@ Crystal oscillation frequency is 7.2 MHz.
@ The crystal oscillator has a built-in self-bias amplifier and can be composed easily only by connecting a crystal and a
capacitor. Further, oscillation is stopped under the inhibit state.
Reference Frequency Remarks
25 kHz at FM band
9 kHz at MW 9 kHz separation
10 kHz at MW 10 kHz separation
1 kHz at LW band
2. Programmable Counter
The programmable counters for FM and AM (MW/LW) are in different circuit configuration.
1) FM Programmable Counter
The FM programmable counter is of swallow count type in combination with eo As a result, reference frequency
25 kHz is obtained and performance is improved.
In this case, the transmission delay time of PSC output for controlling TD6104P is limited. PSC transmission delay time
td < 250 ns.
2) AM Programmable Counter
The AM (MW/LW) programmable counter is of direct division type.
The signal transmitted from AM channel can be directly input to AMjy terminal.
11

AM (MW/LW) OSC
0.01 uF
AMIN (39)
AM\n Input Amplitude Viy (AM) 20.5 Vp-p
®
As
both
FMjn
and
AMjy
have
a
built-in
input
amplifier,
a
signal
shall
be
applied with
a
capaciter
connected.
®
Under
the
inhibit
state
and
at
AM
(MW/LW),
PSC
output
is
fixed
at
‘’L”’
level.
©
{F
offset
has
been
provided
in
advance
for
frequency
division
by
the
programmable
counter.
3. Phase Comparator
The phase comparator is a unit that compares phases of reference frequency and programmable counter output and controls
Veo through the low pass filter so that thus two signal frequencies and phases agree each other.
@ Two tri-state buffers DO-1 and DO-2 are transmitted parallely from one phase comparator. Because of this, two sets of
low-pass filter can be used without necessity for switching them.
@ Under the inhibit state, both DO-1 and DO-2 outputs are kept at ‘’L”’ level.
Reference R
Frequency
Phase (35) Do-1
Programmable _S Comparator
Count Output
(34) DO-2 High Impedance State
DO Output Timing Chart
@ Control Unit
1. Determination of OSC1 and OSC2 Oscillation Frequency
OSC1 and OSC2 are C and R connecting terminals of a single terminal type oscillator. Scan speed at time of manual fast
forward and auto search is decided by this frequency.
OSC1 is for FM and OSC2 is for AM and oscillation frequency can be set independently. Further, OSC1 oscillation frequen-
cy also seves for deciding manual fast forward pushing time, muting signal transmission time and store state automatic re-
leasing time.
Both OSC1 and OSC2 stop oscillation unless it is required.
Oscillation Frequency Fosc = (Hz) (Note 2)
1
0.7 CxRx
(Note 1} Rx = 10k ~ 100kQ
12

Scan Speed (Fast At FM | fs (FM) = 1/2 fosci (step/sec) 10 (step/sec)
FWD. Auto Search) | At AM (MW/LW) | fs (AM) = 1/2 fosca (step/sec) i 10 (step/sec)
Manual Fast FWD Push Time Tscan = 14/fosei (sec) (One Example) 0.7 (sec)
Store State Auto Release Time Tsto = 224/fose1 (sec) When fosc = 20 Hz 11 (sec}
Muting Signal Tmute {S) = 7/foser (sec) 0.35 (sec)
Output Time Tmute (L) = 15/fogei (sec) 0.75 (sec)
(Note) fosc1: OSC1 Oscillation Frequency, fosc2: OSC2 Oscillation Frequency
2. Designation of Destination by Japan, U.S.A. and Europe
Regional designation by Japan, U.S.A. and Europe is made by E1 and E2 terminals.
Destination
Japan
Europe
MW 9 kHz separation
MW 10 kHz separation
@ For U.S.A. region designation, AM (MW) band 9 kHz/10 kHz separation can be selected.
(a) Method of auto stop signal input during normal auto search.
Input the auto stop signal to both STOP1 and STOP2 terminal, or with STOP2 terminal fixed at ‘‘H” level, apply the
auto stop signal to STOP1 terminal.
(b) When ARI or Stereo Station only is searched.
Apply the normal auto stop signal to STOP1 terminal. Apply ARI or Stereo Station indentification signal to STOP2
terminal (‘'H” level shows ARI of Stereo Station).
(c) When Auto Stops Signa! is received (when there is a broadcasting station), Scan is stopped.
@ The auto search tuning scan system is in triangular waveform shape.
® When the key is pushed during the scanning in the up direction, the scanning is changed in the down direc-
tion. Similarly, when the [UP] key is pushed during the scanning in the down direction, the scanning is reversed
in the up direction.
UPPER SIDE
BAND EDGE
START
STOP STOP
BROADCASTING or STpP
LOWER SIDE
BAND EDGE
@ The auto search scan speed is same as the fast forward scan speed f, (FM) at FM, fs (AM) at AM (MW/LW).
The auto search tuning is released when the following operation is mode:
When the operating mode is changed to the manual scan mode.
When a receiving band is changed.
When the preset memory is read.
When the status is changed to the inhibit state.
@ When the or key is kept pushed during the auto search tuning, no auto stop signal is accepted. In
addition, the band edge is reached, the auto search tuning is stopped.
13

3. Auto Stop
1) STOP1, STOP2 Terminals
@ When a “H” level signal is applied to STOP1 input, auto search scan speed is reduced to 1/2 (Slow mode).
@ When aH” level signal is applied to STOP2 terminal under the slow mode (STOP1 = at ‘‘H” level), the auto search
tuning is stopped.
Through the above operations, it is possible to stop the auto search after searching ARI or Stereo station only.
2) STOP3 Terminal
This terminal is the input of IF signal (=450 kHz) at time of AM (MW/LW). When this input frequency enters the speci-
fied range against 450 kHz, auto search tuning stops.
@ As the input amplifier has been built in, apply IF signal with the capacitor connected.
@ IFin, STOP3 input is not accepted at time of FM.
@ Range of Auto Tuning stopping.
MW Band 450 kHz + about 3 kHz
LW Band 450 kHz + about 600 Hz
@ Since IF signal has been amplitude modulated, it is adequate to apply it to IF iy, STOP3 terminal through the limitter
amplifier.
mn Dud
-—$—_<;—+— AM (MW/LW) IF SIGNAL
0.01 uF
LIMITTER AMPLIFIER
TC9147P
SPOR SISTEM IF jy, STOP3 INPUT AMPLITUDE Vy (IF) >5Vp-p
4. Memory Function
This is the function for tuning a desired channel by one-touch by constantly storing optional frequency data.
The terminals concerned with the memory are STO, M1 ~ M8, MC1, and MC2, a table of 11 terminals. Inputs are all ‘“H”
level active.
@ STO and M1 ~ M8 terminal are of !/O type with a built-in bipolar transistor status display driver.
@ MC1 and MC2 terminals control the built-in 16 channel preset memories as shown in the following table.
Allocation of 16 channel preset memories
Memory type
Memory addresses for 1 ~ 8 channels are assigned
by M1 ~ M8 terminals.
Memory addresses for 9 ~ 16 channels are assigned
by M1 ~ M8 terminals.
No input is accepted. Memory allocation holds the
previous status.
16 channel random
memory system.
Automatically allocated to 8 FM channels and
8 AM channels. Further, at time of AM, MW and
LW band random system.
@ MC1 and MC2 Inputs are of mutual resetting 1/O type with an internal latch circuit.
(Note) MC1 and MC2 terminals are of C-MOS I/O type and has no built-in driver.
14
8 FM/AM channel fixed
memory system.

5. Receiving Frequency Display
The frequency display of TC9147P is explained here. The linear display of TC9146AP will be separately explained. Receiv-
ing frequency is displayed using the external static display driver TC6301 AP.
@ Maximum Ratings (Ta = 25°C} Bis connsateas
onne
Characteristic Symbol Tating
Supply Voltage Vec 8
Input Voltage VIN —0.3~ Vcc +0.3
Output Current lor (MAX) 20
Output Voltage ‘|You (MAX) 20
Power Dissipation L Pp 1.0
Operating Temperature) Topr
Storage Temperature Tstg
Q503
@ Block Diagram
a1 bi ci di e@1 fi gi a2 b2 c2 d2 e2 f2 ge a3 b3 c3 d3 e3 f3 93 1/0
Cy TTT
7-SEGMENT
DRIVER
7-SEGMENT 7-SEGMENT
DRIVER DRIVER
ADD ADD
CIRCUIT CIRCUIT
BINARY TO BCD + IF OFFSET ROM
15

®- Pin Description
Functional Description Remarks
L/D
Output state switching signal input. Signal input
for switching output state by displays (LED, FL
and LCD).
Data
Receiving frequency data signal input. Signal is
input in serial from system controller.
CKi, CK2
Timing clock signal input.
1/0
Segment drive signal output. For FM the digit
of 100 MHz and for AM that of 1000 kHz are
displayed respectively. Since both FM and AM
are 1 or O, one pin only is sufficient for output.
With built-intransistors of
high resisting voltage and
large current flow.
7-segment drive signal output. Digits of 10 MHz
for FM and those of 100 kHz for AM are displayed,
respectively
With built-intransistors of
high resisting voltage and
large current flow.
13,15~20
7-segment drive signal output. Digits of 1 MHz for
FM and those of 10kHz for AM and displayed,
respectively.
With built-intransistors of
high resisting voitage and
large current flow.
Vec, GND
7-segment drive signal output. Digits of 100 kHz
for AM and those of 1 kHz for AM are displayed,
respectively.
Power supply GND.
@ Electrical Characteristics (Unless otherwise specified, Vcc = 5V, Ta= 25°C)
Characteristic
Operating Supply Voltage Range
Test
Circuit
Test
Condition
Ta=—30 ~ 75°C
Operating Supply Current
——-}
No load
5 eee
With built-intransistors of
high resisting voltage and
large current flow.
| min. | Typ. | Max. | Unit
| 45 | 50 155 | V
“HY” Level
Vino Data, CK;, CK2, L/D
Input Voltage
“L’ Level
Vin Data, CK,, CK2, L/D
“H" Level
Input Current
iw Data, Vip =5V
“L’ Level
Nie Data, Vi, =O0V
Output Current
a1 ~ 91, a2 ~ 92,43 ~Q3,
l
: 1/0
Output Saturation Voltage
Ve (sat) 1/0, lo. =15mA
a1 ~ 91, 42 ~ 92,43 ~ 93,
Timing input Operating
Frequency
fopr Data, CKy j CK2
Receiving frequency data in serially transfered to TD6301 AP through DATA, CK1 and CK2 terminals.
16

@ The Output timings of DATA, CK1 and CK2 terminal are shown in the following diagram.
(1) DATA Output
BAND DATA
5 BITS
16 BITS
1 CYCLE (1.8ms)
@aaaéa
BIT!
a=20us
Frequency data and band data are serially transmitted in 16 bits. 1 ~ 11 bits are frequency data and 12 ~ 16 bits are band
data.
@ Frequency Data
This is a value of receiving frequency minus the lower band edge of that band. This value is transmitted in binary 11 bits.
e@ Band data are as shown in the table.
Band
LW Band
FM JAPAN Band
FM U.S.A./Europe Band
MW 9 kHz separation
(2) CK1, CK2 Output
MW 10 kHz separation
These outputs are timing clocks for reading DATA output by TD6301AP. DATA, CK1 and CK2 outputs are transmitted
by are cycle only in the following cases:
@ When the inhibit state is released.
@ When a band is changed.
@ When the preset memory is read.
® At time of UP/DOWN tuning.
17