Marantz SR 8100DC User manual

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. P.W. BOARDS
INTRODUCTION “4
This service manua! was prepared for use by Authorized 1, Tuner {PRONG «3 2. sack see a ee ee eee ee P100 © ees
Warranty Stations and contains service information for 2: Controiler 2. eon aka Vad nik deco a Seti P5000.
Marantz Model SR-8100DC Stereophonic Receiver. 3. VFL. and Signa! LED. .............-.-4 PSOt
* A, PEband LPF. wn. cee eee ee we P502
Servicing information and voltage data included in this 5. Controller and F.1.P.Jumper ............ P503
manual are intended for use by the knowledgeable and ex- 6. Controlier and PLL Jumper .. 2... 2... 2 ee P504
perienced technician only. All instructions should be read 7. MainAmp ... 0.00.00. 0 0 cee eee ee ee ee PPOO
carefully. No attempt should be made to proceed without §. (Main: AMP sd.5. 5 fee ha Geen ete an esas P701 7
a good understanding of the operation of the receiver. 9. Power Supply 2.2.0... eee ee eee P8&00
10. Scan Step SW. 2... see eae. Sct hat Ga PC5O
The parts list furnishes information by which replacement Ts TONGSAM Pe ies, oP ae a eek est tke PEOO ie
parts may be ordered from the Marantz Company. A simple 12. Tone Volume............. Se aANGehlnp ede: abst PEO1
description is included for parts which can usually be ob- 13. Connection... 6... eee PEQ2
tained through local suppliers. 14, Vol/Balance... 2... ee ee ee ee POO
15, Tape Monitor SW... ee ee PJO1
16. Protector ioscan Can) p86 bea ee eae PLOGO
47. AC Power Relay ............-.-22-00005 PQOO
18, Filter/Loudness ..........2....2 0.20005 Psoo
19. Speaker Terminal ...... bebe, ean Spapheeuce S PSO7
20. Timer Switch .......0004 ge sp cklins sae ached PS5O =
21... KOY Board sec ek es ate cc wig aes he Sear es PTOO ne
22. Power Off Switch ......-...........-., PT50
232. FUNCTION SW. 6 oss eles ae aa ee ane, eee PUQO
24. - C/E DIislay® atsscecseee-sad ie ecw bok ey oa ee ti PU5O
25. Head Phone... 2... eee ee PWO1
2, TEST EQUIPMENT REQUIRED FOR SERVICING
This table lists the test equipment required for servicing the Model SR-81G0DC Receiver, : c -
{tem Manufacturer and Model No. Use
AM Signal Generator i Signal source for AM alignment —
Test Loop . | ; ; : Use with AM Signal Generator
. i i Signal source for FM alignment
. py ne ceca | rae se Stereo separation alignment and trouble
shooting
Distortion Analyzer Distortion measurements
Audio Qscillator : reas aaa Sinewave and squarewave signal source
AC VTVM Voltage measurements (AC}
Gistilioseoise Tektronix Model T932 Waveform analysis-and trouble shooting and ?
canned "Philips Model 3232 _ASO alignment
Frequency Counter Fluke Model 1900A MPX Oscillator adjustment (VCO)
Circuit Tester ; : Trouble shooting
Fluke Model 8000 “Digital” Simpson
DC VTVM Model 313, Triplet Model 801 Voltage open bill (DC}
AC Wattmeter Simpson Madet 1379 . Monitors primary power to amplifier
Ker Ree atag | Commercial Grade (1-10A) Monitors amplifier output under short circuit
i condition .
Line Voltmeter | Simpson Model 1359 pics potential of primary power to
peepee
; Superior Electronic Co.,. oe ; : a
Variable Autotransformer | Powerstat Model 116B- 104 a Adjusts level of eripaly power to amplifier
: Use phono plug with 600-ohm _ Shorts amplifier, input to elminiate noise
Shorting Plug across center pinand shell |: pickup. _ he
Output Load {8 ohms, Provides 8-ohm load for: appl ifier output a
+0.5%,700W) =. - Commercial Grade = termination | o
Output Load (4 ohms, Provides 4-ohm ioad for aye ifier output
_ Commercia! Grade
£0.5%, 100W) termination

TABLE OF CONTENTS
~ Section . 7 Page
Wo PAN BOARDS: 6. oe mei baa Sey Bing cea atv uf diab dnie Gaines vait ash ogked aiareetthee Be 1
2. TEST EQUIPMENT REQUIRED FOR SERVICING .............. 0. cc cece cee ee cee eauce 1
3. FREQUENCY SYNTHESIZER RADIO TUNING SYSTEM .......... 0200-00 eeu eeeueee 2
4; ALIGNMENT PROCEDURES ©. a... ye.ctiraowaiis sis eg Was oes ek angie a gti@e Bw aa aa aele _ 11
5. VOLTAGE CONVERSION ....... 0... 0... 0. cece ce ee cee ee eee eee F ateiecey Aces Meta esw 8 14
Gi. “BLOCK. DIAGRADMD sicicsico seats awe ie Be dates eee eet dca Stennett do anat's fe anand eb Sv ages Seadene a avetedecbkcs 15
7. DIAGRAM AND COMPONENT LOCATIONS... .uiescgaa wei hoodie ob eed ob eee 16
7.4 Tuner/Phono Amp. {P100) Schematic Diagram and Component Locations ............000eceaeue 16
7.2 Filter/Loudness (PSQ0} Schematic Diagram and Component Locations ...........00-0+eccueues 16
73 Head Phone {PWO1) Schematic Diagram and Component Locations ..... eee iyein isda a acan eae ete ne Biacieteee 18
7.4 Timer Switch (PS56) Schematic Diagram and Component Locations .... . fp evel iel ale finite OL. 0 UE) Arata rete 8
75 Tape Monitor Switch (PJO0} Schematic Diagram and Component Locations ........ 0.0.06 .0eee ee 18
7.6 Controller (P500} Schematic Diagram and Component Locations ........,.2.000ceceeceuccnaue 19
V7 PLL/L.P.F. (P501) Schematic Diagram and Component Locations ....-....-5 0.000 ce eae cuucece 19
7.8 VEFL/Signal LED {P502} Schematic Diagram and Component Locations. .........0.2. 0000 ce eceue 19
7.9 EQ Out {PK00} Schematic Diagram and Component Locations ..........00 0. cc eeu ecu weevace 21
7.10 C/F Display (PU50) Schematic Diagram and Component Locations. ............000ee00 05 eaters 21
7.11 Vol/Valance (PGO0O} Schematic Diagram and Component Locations ..........00. 00 cece ac cuaue 21
7.12 Function Switch (PU00} Schematic Diagram and Component Locations ........0.2 0 ccc ee ee sees 21
7.13 Main Amp. {P701) Schematic Diagram and Component Locations ........0.00 000 eee ee eaees 22
7.14 Main Amp, (P700) Schematic Diagram and Component Locations. ........... 00000 cecedecaeee 22
7.15 Key Board Switch (PTO00) Schematic Diagram and Component Locations....:.........000. ere 22
7.16 Power Off Switch (PT50) Schematic Diagram and Component Locations .............000050- nae 23
7.17 Scan Step Switch (PC50) Schematic Diagram and Component Locations ............000ceeeceas 23
7.18 Speaker Protector (PLOG) Schematic Diagram and Component Locations ............- cece eceeue 23
7.19 Tone Amp. (PE00) Schematic Diagram and Component Locations ..........-.00 cue eueeeucune 24
7.20 Speaker Switch (PSO1t} Schematic Diagram and Component Locations.............0ceeseeeeaae 24
7.21 Connection (PEO1) Schematic Diagram and Component Locations ...........0.0 ccc cee ee avece 24
7.22 Tone Amp. (PEO2} Schematic Diagram and Component Locations ............-..000cees Batis 24
7.23 AC Power Relay (PQ00) Schematic Diagram and Component Locations............ taslal a, Bea een ane i 25
7.24 Power Supply {P800) Schematic Diagram and Component Locations.........-0...0 ce eee eee ace 25
7.25 Tone Volume (PEO3) Schematic Diagram and Component Locations. ..........0.-. cece eeeeeae 26
7.26 Controller/Fip (P503) Schematic Diagram and Component Locations ............2-00cceeeueae 26
7.27 - Controller/PLL (P504) Schematic Diagram and Component, LOGAtIONS os ie ek 886 e i068 ow ete ees 26
8. EXPLODED VIEW AND PARTS LIST... ce ce cc ee ee teen en ues 27
9. TECHNICAL SPECIFICATIONS ..... cc ce eee eee i 3 Pisa ooay env acate 45
10./ SCHEMATIC: DIAGRAM, © aici 4 oie sciaien we ae ORE Ae ase ea ee ee ET AR obG o owow res 46
MODEL SR8100DC STEREOPHONIC RECEIVER
Basa"

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
-fo
which
it
is
famous.
:
"
a,
Parts
for
your
MARANTZ
stereo
are
generally
available
within
72
hours
throughout
the
nation
via
a
toll-free
ling
to.
our
National
Parts
Depot
in
California,
The
sales
professionals
who
take
your
cail
immediately
refer
to
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own
desk
top
com-
puter
terminal
and
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and
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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.
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order
is
placed
and
confirmed,
the
computer
simultaneously
generates
“‘hard
copy”
orders
at
the
distribu:
a
tion
center.
As
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copies
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to
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national
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depot,
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is
assembled:
and
prepared
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shipment
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available
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for
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to
you.
on
7
ORDERING PARTS
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order
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use
MARANTZ
parts
ob...
.
-
order
froms
which
are
available
from
our
National
Parts
Depot
!ocated
at
the
following
address:
,
SUPERSCOPE NATIONAL PARTS DEPARTMENT
20525 Nordhoff Street
Chatswosth, California 91311
Phone:
1-800-423-5108
:
1-213-998-9333
bine
The
following
information
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to
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in
processing
your
order:
i
. Complete address.
. Complete part numbers,
. Complete description of parts.
_ Modei number for which part is required (indicate MARANTZ}.
, Account number (for account customers only).
Ok WN =
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consumers
will
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on
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shipping.
OVERSEAS PARTS ORDERING
Parts may also be ordered fram the follawing overseas addresses:
USA,
CANADA
|
AUSTRALIA
JAPAN
Marantz
Company,
Inc.
Superscope
Canada,
!
td.
Marantz
Australia
Marantz
Japan,
ine.
National
Service
Dept.
3710
Nashua
Drive
32
Cross
Street
3622
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P.O.
Box
577
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2100
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Chatsworth,
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91311
Ontario,
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L4ViMS
Australia
Kanagawa,
Japan
U.S.A.
ae
.
EUROPE
a
MARANTZ
AUSTRALIA
PTY.,
LTD.
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GERMANY
GMBH
MARANTZ
AUDIO
U.K.,
LTD.
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SVENSKA
A.B,
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Cross
Street
Max-Planckstrasse
22
Unit
15/16,
Saxon
Way
Franzengatan
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2100
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UB7
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-
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configuration
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ee
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i

3. FREQUENCY SYNTHESIZER RADIO
TUNING SYSTEM
3.1 Construction of Synthesizer System
This frequency synthesizer is composed of a micro-
computer (MN14551.F), PLL’LSi (MN6147)}, lowpass filter,
crystals and fluorescent indicating tubes, as shown in Fig. 1.
3.2 Microcomputer MN1455LF
(1) Terminal connections
TOP VIEW
VSS 1 Osc
CO 11 2 VDD
CO 10 3 DO?
co9 4 DO6
cos 5 DOS
cO7 6 po4
COs 7 DO3
cos 8 DO 2
co4 9 DO 1
CO3 DOO
C02 SNS 1
co 1 SNS 0
coo CSLCT
Ai 3. > RST
Ai 2 TST
Al 1 EO3:
Al 0 EO 2
BI 3 EO 1
BI 2 EQQ
Bi 1
SD signal
signal
Function selector circuit
(FM AM,PHONO,AUX)
Frequency/clock/memory LED
l 254733 Q502
MN6147 x8 ~O509
74LS42
Preset memory
Segment driver
pom 1 {Led driver)
MN1455LF ©
MICRO COMPUT.
Power outage
Ee
» 28A733x6
{(O511~0516)
KEY BOARD
&
SWITCHES
Figure 1. Block Diagram of Synthesizer
BIG
MNi455LF
Figure 2.

(2) Specifications
tem
Power supply voltage
Input termi nal voltage
Peak envelope output current
i
IoH (peak}
Io. (peak)
Average output current ©
—
me
Tox favg.}
Power consumption 500
Ambient temperature
~20 ~ +70.
Storage temperature
—55 ~ +100
fee

{3) Functions of terminals
= Pin Pin
as Code | Symbol {
VSs
2 C011
Function
; Ground terminal
LW source controt output terminal, |
H teve!l output ,
MW source control output terminal,
H level output
FM source control. output terminal,
H level output
Function
Data output terminal for BCD driver
SN74LS42 Preset memory display
_LED (M1 — M8) and PHONO, AUX1
and AUX 2 source LED contro} terminal
Test terminal. Connected to ground
AC outlet output terminal, H tevel
output
Muting output terminal, H level
output
Data latch clock output terminal for
MN6147
Frequency display digit output and
switch and key matrix scan port,
The scan is low level,
COS..,G1,004...G2,C03... G3,
CO2...G4,C01...G5,Cc00..,
'GS1, GS2
Bi3
Switch and key matrix input terminal.
The input signal is always supplied
from the micro computer standard
routine. ; ;
Reset terminal. When power is supplied
to the micro computer, the level is L.
in the norma! condition, the ijevel is
H.. :
To use the SNS? for counter mode,
connect to ground. (For the models
| without clock, connect to ground.}
Lock detection input terminal for
; PLL system, The MN6147 ALDO
signal is applied to this termina! via
the filter. This terminal is used for
auto up/down station seek.
Lock mode — H fevel input
Unlock mode-— | level input
Reference clock {250 Hz) input
terminal. Input from MN6147 CK2.
For the models without clock, connect
Station detector signa! (tuning
detector signal) input terminal.
Checks the input only in the auto
up/down station seek.
Station detector signal — H level input
Non station detector signal — L ievel
input.
In the norma! condition, the muting
is released regardiess of the station
detector signal. ; '
+ MN6i47 data output and display
° segment output terminal.
| The segment sean is iow.
Power supply terminal (+5V + 10%)
Bi2
detection terminal. [n the battery
back-up mode, the output of the micro
computer becomes low and only the
clock is counted. When the power is
recovered, the unit is set to GFF mode
(OFF key on condition} and display
indicates the current time.
| Battery back-up mode — L level input
Normal power supply — H level input
Micro computer clock (526.5 kHz)
input terminal.
Input from MN6147 CK1.

3.3 PLL LStMN6147
(1) Terminal connections {2} Specifications
‘Absolute maximum ratings (Ta = 25°C) bead
Vss
G1
Condition
.
Loom 2 Power supply
voltage
oscig3
Input voltage
Osc2y
ckK1m
Allowable loss
Operating
temperature
Storage
temperature
Figure 3.
(3) Block diagram
2-coefficient prescaler
«oA pp.
AMLO (15) he o-—{> a> O MPX
Swallow counter
SWwiMW (17)
FM/AM MPX |
CPL
DAQ
DAT Data ratch
DA2
DA
OOO® CH
Reference frequency counter
> :
OSC! OSC2 CKi CK2 Vek Vpp Vss Figure 4.
(4) Functions of terminals
Description
Ground i 8 [ CPL Latch clock
Description
Oscillator output : 9 DA3~DAG | Data address input
OSCi ~ 2 | Crystal oscillator {4.5 MHz} . 10 Vpb Main power supnly
14 |cK1 | Clock output (562.5 kHz) 11 AMLO AM Jocal osciliator input
fs | cK2 | Clock output (250Hz) <r 12. | FMLO —_ FM local oscillator . . a
VoK Clock circuit back-up ; 13 SW /MW SW/MW selector
PD - Phase comparator output : 14 FM/AM FM/AM selector

(5) Data input timing chart
: ' (RLF. 25kHz)
Nc GO?
FS A RSET 0
a ay eg Le Err Ne NC eS
RAY cue, FcR OT eS ty C1, )
——— |
ee
oO C4
Oo 1
ENT, Y,
SS eee 5
SSE EEE 3
SS ee
——— ee oO
nt
ay ae ay, SS 4
Fr Enid
G8
av a, ER
VCO frequency
— ere
e. 22 “Teal
DAG ~ 3 =
Latch address data Input data | Latch address data
113.850 MHz Figure 5.
{6) Relationship between data input terminal and programmable counter
Main counter Swallow counter
Ea rs =
iT 2 [sl aslo] 7] sf frof rif 2fis[ s4]15f:6] +7 }13] 19] 20]23} 22] 23}
REREERRESMREES RES RREARE
et see oe a ae ee
CPL 9
DAZ 0
ee er os a eS
DAI ¢ = =
DAO & Figure 6.
(10) FM, SW, MW (LW) signal process list
FM/AM(18}| SW/MW(17)
Sw {15)
MW (LW) (15)

3.4 PLL Synthesizer Tuning System: Theory of Operation
As shown in the Figure, the output frequency of the
FM/AM local oscillator is automatically locked to a con-
stant frequency by the PLL network which is operating
under microprocessor control.
tn the FM mode, part of the local oscillator output is
coupled to the FM input terminat of the PLL block via a
buffer amplifier (for example, when the received frequency
is 98.1 MHz, the local oscillation frequency is 98.1 + 10.7
= 108.8 MHz).
Meanwhile, the microprocessor accepts frequency data
input from the keyboard and provides the data of, say,
98.1 MHz to the display. It aiso provides frequency divid-
ing-ratio data to the PLL biock. Since the reference fre-
quency for the FM mode is 25 kHz, dividing ratio N is
determined as follows: :
N = 108.8 MHz + 0.025 = 4352
When the 50 kHz stepping interval is selected in the FM
mode, the FM frequency band is between 87.5 and 108.0
AMRF FM RF
4.5MHz
11/3928—
1/4748}
AM i
1 (4748)
MHz, and hence the local frequency band is between
98.2 and 118.7 MHz. As a result, the dividing ratio is be-
tween 3928 and 4748. /
Once dividing ration is determined, the local oscillation
frequency is divided by N, and the resultant signal phase
is compared. with the reference signal phase. The refer-
ence signal is created by dividing the master oscillator
output of 4.5 MHz, and its frequency accuracy depends
on that of the quartz crystal element used in the master
oscillator. :
The frequency divided in the PLL block (108.8 MHz +
435 = 25 kHz} is phase-compared with the reference fre-
quency of 25 kHz, and the phase difference between the
two signa{s is converted by the PLL into a corresponding
pulse array, This pulse array is cougled to a low-pass filter,
where it is converted into a corresponding DC level, which
is then feed back to the local oscillator’s contro} input to
control the faca! oscillator output frequency to a constant.
PHASE
COMPARATOR
Reference
frequency
divider “Vay FM: 25kHz
AM: SkHz
ic} FM: 25kHz
AM: 10kHz
|
11/3944—
4)4744 FM: 25kHz
AM: 10kHz
|
| :
1/108—1/229 | 1/98 — 1/207 | 4/98—14/207
Receiving frequency
87.50 ~ 108.0 MHz
522 ~ 1611 kHz
87.50 ~ 108.0 MHz
530 ~~ 1620 kHz
i. 87.9~ 107.9MHz_
[sar Ste |
200 kHz
Loca! oscillator frequency
MN1455LF
- Figure 7.
Number of channels
98.2 ~ 118.7 MHz
972 ~ 2061 kHz
98,2 ~ 118.7 MHz
980 ~ 2070 kHz -
93.6 ~ 118.6 MHz
10 kHz
530 ~ 1620 kHz
980 ~ 2070 kHz
r——:

3.5 Description of Switches
Switch and Key Matrix
os LS
Momentary switch (Keyboard SW)
C port
C port
Switches 0-9: these switches are used for read/write
operations for memories CH.1-8, timer set-up, and
read/write operations for EVERY ON/OFF and ONCE
ON/OFF data. , :
UP/DN
switches:
when
the
Auto/Manuat
switch
is
set
at
Auto,
pressing
these
switches
scans
frequencies
up
or
down
until
a
search
signal
is
input.
a
When
the
switch
is
set
at
Manual,
each
depression
of
these
switches
steps
up
or
down
the
frequency
by
ane
step.
When
the
switches
are
held
down
continuously
for more than.1 second, continuous frequency scan-
ning starts.
EM/AM/PHONO/AUX: select input program sources.
The FM and AM selector switches are shared by the
9 and 0 numerical keys.
C/E CALL: recalls time and frequency data for 5 seconds,
C/F DISPLAY: switches between time and frequency
display.
8 part
Alternator switch (Push SW, Rotary SW]
+5V
Vee
44-~21 pin
9~12 pin
Figure 8.
SLE: used to set up the sleep timer function. This switch
function is independent of the timer function. .
AUTO/MANUAL: switches between the muting and scan-
ning functions in the FM mode. .
B2/B3: select scan stepping intervals with the following
combinations:
AM (kHz) |FM {kHz}
IF: controls the intermediate frequency in the FM mode
over +25 KHZ.
CANCEL: WRT, REA, C, SET, MANUAL.
TIMER: selects timer modes.

Indicator
The indicator employs fluorescent tubes for dynamic
lighting.
GS2 Gs G4 G3 G2 G1 GSI
>> SN a SN a a a a aa Se ed a
~ a2
| t — ii
FM STEREO ! ¢2f ga fot 142
y AZINAL 1 at al pee
1 QE ivi 1/071 d2ke2ile
Connection - Connection
ars 5
“ad
G3
FM STEREO : . e2
ME
GS2
je, m2
94
eq
dg
OOo wl nl a lawl nya
. &q
> o
Details of display
3
c
Dp
7
=
A=
Q
MN1455LF
2M
g 5 Segment signal
we ==. Figure 10.

Dynamic lighting timing chart
Micro- Indicator
computer grid
OUTPUt ;
4
. CO5 —— GSI, GS2
co4. —— G5
cos) —— i G4
coz2° ———- G3
coi — G2
cop —— Gi
Dog? —— 1,kHz
‘p01 -~——— »b
bpo2 —— C,AM
Dpo3. —— _ 4d,FM, MHz
DO4 —-~ @
DOS. -—— f,ME
poé —-~ g
DO? —— Dot
; FM a
varus) | a
Lies eat | afi
Memory
MHz Goes off ‘Figure 11.
70

‘4, ALIGNMENT PROCEDURES
AUDIO ALIGNMENT (FUNCTION switch in AUX position and VOLUME control in the minimum position at NO load) . a=
4.1 DC of set {Adjust with a digital volt meter.)
‘Test point ~— SPK out {L & R)
Adjusting point —— R705 (L), R706 {R}
Specified values — O mV
A dummy resistor of 47 kohms must be connected across the tuner output terminals before alignment.
4.2 Idling current (Adjust with a digital volt meter.)
Test point — J705 ~ J706 (L), J707 ~ J708 (R)}
Adjusting point —~ R717 (L), R718 (R}
Specified value —— 713.2 mV (20 mA}
4.3 FM Alignment Procedures (Selector switch in the “FM” position and mode/tuning switch in the “Mono/Manual”’ position)
FM Local Oscillator Alignment {Scan step selector switch (SC51)} in the “50 kHz’’ position)
Signal Source
Connection
Signal
Frequency
Indicator
Connection
Set the Digital
Read out Frequency to:
Adjust:
DC Volt meter in
30V and 3V range
to point (A)
{1116}
108.00 MHz
C142 for 20.0V
87.50 MHz
L104 for 3.0V ao
Signal Source
Connection
Signal
Repeat steps 1 and 2.
indicator
Connection
RF generator to FM
antenna terminals
(B} through matching
network (300 ohms
balanced} {Maintain
RF level below limit)
! Frequency
106.10 MHz
90.10 MHz
VTVM to L or R
channel output
{JJO1 of JJO2)
Set the Digital
Read out Frequency to:
Adjust:
106,10 MHz
C101, C105, C107
for maximum out-
put and minimum
’ distortion
90.10 MHz
L101, L102, Li03
for maximum out-
put and minimum
distortion
Repeat steps 7 and 2.
RF generator to FM
antenna terminals
{B} through matching
network (300 ohms
balanced) {Maintain
RF level below limit)
RF generator 1 mV
output to FM antenna
terminals B through
maching network
(300 ohms, balanced}
RF generator 300 uv
98.10 MHz
VIVM to Lor
channel output
{JJO1 or JJ02}
98.10 MHz
L106 for maximum
output and mini-
mum distortion
98.16 MHz
“O° Center Meter
or DC current
meter in 100 vA
range to point (C}
($109 and J110)
L108 Core so that
the meter indicater
its center or may
read “0”
98.10 MHz
Distortions meter
ta L or R Channel
output (JJ07 or
JJG2)}
11
98.10 MHz
L108 core for mini-
mum distortion
R136 so that signal
Strength Led may 2
-light 5 points ; f

Muting Circuit Alignment (FM Stopping Level of Scanning, FM Stereo indicator threshold Level)
Signal Source
Connection
Signat
Frequency
Indicator
Connection
Set the Digitat
Read out Frequency to:
Adjust:
Multiplex Alignment Procedures (
RF generator 12.5 uV
output to FM antenna
terminal (B)
network {300 ohms
balanced)
Signal Source
Connection
98.10 MHz
Signal
Frequency
VTVM to R or L
channel output
(JJ01 or JJO2)
Indicator
Connection
98.10 MHz
Set the Digital
Read out Frequency to:
R131 for 12.5 pV
threshold Level
(Setting to Auto
position of mode
switch & Low Level
position of threshold
Level switch)
Function switch in the “FM” position, Auto/Manua! switch in the Auto position)
Adjust:
RF generator to FM
antenna terminals
(B) through matching
network (300 ohms,
balanced), with 1 mV
FM stereo simulator
RF level and Pilot 9%
modulation
No.
modulation &
pilot off
Frequency counter
to point (D)
(J1 14)
Pilot only
VTVM to right
and left channel
output
(JJ01 or JJO2)
98.10 MHz
R304 so that Fre-
quency counter may
precisely read 76 kHz
AM RF Alignment
Signal Source
Connection
Signal
Frequency
Indicator
Connection
Set the Digital
Read out Frequency to:
Adjust:
Apply the signal to
the AM loop antenna
from the RF gene-
rator, using the test
loop. As par the
Figure 12(with 3 mV/m)
1400 kHz
600 kHz
[oo ert
i
VTVM to LorR
Channel output
(JJO1 or JJO2)
1400 kHz
CAO2 for maxi-
mum output
600 kHz
LA0O1 for maxi-
mum output
Repeat step 1 and 2 as necessary to obtain maximum sensitivity.
R307 so that mini-
mum output should
be the same in both
channels
Signal Source
Connection
1000 kHz
Signal
Frequency
PLL Oseillator Alignment (Function Switch in the “AM” position)
Indicator
Connection
1000 kHz
Set the Digital
Read out Frequency to:
RA11 so that
signal strength
LED may light
5 point
Adjust:
RF generator to FM
antenna terminals
(B) through matching
network (300 ohms
balanced) with 1 mV
FM stereo simulator
RF level and 100%
modulation (pilot 9%)
Stereo, left
(1,000 Hz)
Stereo right
(1,000.Hz)
VTVM to right
channel
(JJO1 or JJO2)
VTVM to left
channel output
terminal
(JJO1 or JJO2)
Repeat step 3 and 4.
4.4 AM ALIGNMENT Procedures (Function Switch in the “AM” position)
AM Local Oscillator Alignment (Scan Step Selector switch (SC51) in the “10 kHz” position)
Signal Source
Connection
Signal
Frequency
Indicator
Connection
98.10 MHz
Set the Digital
Read out Frequency to:
R322 for minimum
output and same
separation in both
channels
Adjust:
DC Volt meter in
30V and 3V
range to point (A)
(J116)
+
1620 kHz
CA16 for 22V
530 kHz
LAO2 for 2.0V
AM IF
Alignment
Signal Source
Connection
Signal
Frequency
Repeat step 1 and 2.
Indicator
Connection
Set the Digital
Read out Frequency to:
Adjust:
Sweep generator to
point (E) (JA07)
450 kHz
marker
Oscilloscope to
point (F) (JA03)
12
Quiet point on band
LAO3 for maximum
and symmetric
response
No signal
Frequency counter
to point (G)
(J117)
Test Loop
13
AM Loop Antenna
1400 kHz
C515 so that
frequency may
precisely read
1850,000 kHz
Figure 12.

5. VOLTAGE CONVERSION 6. BLOCK DIAGRAM
To convert the unit to a different power source voltage, iris
change the position as illustrated in the drawing below. :
CAUTION: DISCONNECT POWER SUPPLY CORD
FROM AC OUTLET BEFORE CONVERT-
ING VOLTAGE. DO NOT DISASSEMBLE
THE VOLTAGE SELECTOR ABSOLUTELY.
SPEAKER
SPEAKER SYSTEMS.
sw
ATT
RELAY
PRO- TECTOR
AMPLIFIER STATES
ib,
HEADPHONES.
BATTERY BUCK UP.
POWER
AMP
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SUPPLY
POWER
MUTING CIRCUIT
VOLTAGE
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SCAN THRESHOLD
FM FM
MIXER IF AMP.
SIGNAL METER
TAPE MON!TOR
sw
BUFFER
NOTE ON SAFETY: THE PARTS MARKED WITH Z\ ARE IMPORTANT PARTS ON THE SAFETY. PLEASE USE
FUNCTION sw
{Power On SW)
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MEMORY | DRIVER
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7. DIAGRAM AND COMPONENT LOCATIONS
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