Panasonic Technics SA-800 User manual

ORDER NO. $D7804-1349
Service Manual
FM/AM STEREO RECEIVER 7
SA-800
(FE), (ES)
-800
* The model SA-800 (FE) is availabie in far East PX only
* The model SA-800 (ES) is available in European Militaly
_-.wiue Manual for Model No. SA-800 (M, MC).
For additional information, please refer to
Notes: * This service manual included only the change of the SA-800 (M, MC) service manual
(ORDER NO. SD7801-1295).
* When servicing model SA-800 (FE, ES), this service manual and SA-800 (M, MC)
(ORDER NO. SD7801-1295) service manual should be used together.
m= SUPPLEMENTARY OPERATION
RECORDING/PLAYBACK(DIN) SOCKET
VOLTAGE ADJUSTER
@ TECHNICAL SPECIFICATIONS
SA-800 (M), (MC) SA-800 (FE), (ES)
PHONO —_2.5mV/47 kilohms Poe On ents
a AUX 150mV/47 kilohms mags Lop er Rens
Input sensitivity PLAYBACK (TAPE 1, 2) « PLAYBACK (TAPE 1) 180mV/47 kilohms
and impedance 150mV/47 kilos PLAYBACK (TAPE 2) 150mV/47 kilohms
REC/PLAY 180mV/47 kilohms
one
PRE OUT PRE OUT rated 1V, maximum 3V
rated 1V, maximum 3V REC OUT (TAPE 1, 2) 150mV
REC OUT (TAPE 1,2) 150mvV REC/PLAY 30mV
Output voltage
Power consumption 330W (only for America)
600VA (only for Canada) oa
AC 120V (60 Hz) AC 110V/120V/220V/240V (50/60Hz)
Power supply
Ti e
Panasonic Tokyo
Matsushita Electric Trading Co., Ltd. Matsushita Electric Trading Co., Ltd.
17-15, 6-chome, Shinbashi, Minato-ku, Tokyo 105 Japan P.O.Box 288, Central Osaka Japan
byPanasonic

SA-800
m
REPLACEMENT
PARTS
LIST
Change
of
Part
No.
|
Remarks
$A-300
>
Ae
Part
Name
&
Description
netuerks
(M), (MC) (FE), (ES)
TRANSISTORS
TR501,502
|
2SA720-R
|
2SA902S-F
[AF
Amplifier
(Use
in
ranks
ForG)
@|
2
TRANSFORMER
SLT5R29
|
SLT5S25
[
Transformer,
Power
Source
RESISTORS
R533,
534
ERD28TJ102
ERO25CKF2201_
|
Metallic,
2.2kQ,
1/4W,
+1%
ERD251J274 Carbon, 270k, 1/4W, +5%
ERD25TJ184
ERD25TJ683
Carbon,
68k,
1/4W,
+5%
ERD25TJ124
ERD25TJ823
Carbon,
82kQ,,
1/4W,
+5%
R613,
614
ERD25TJ183
ERD25TJ562
Carbon,
5.6k2,
1/4W,
+5%
R702 ERD18FAJ2R2 Deletion
R1001,
1002
=
ERD25TJ394
Carbon,
390k,
1/4W,
+5%
R1003,
1004
-
|
_ERD25TJ104
Carbon,
100k,
1/4W,
+5%
R1005
~
1008
=
[
_ERD25TJ472
Carbon,
4.7kQ,
1/4W,
+5%
CAPACITORS
NEM TN
C521,
522
ECEASOMR68R
ECEASOM4A7R
|
Electrolytic,
4.7¢F,
50V
C551,
552
ECEASOM1R
ECEA50M4R7R
Electrolytic,
4.7KF,
50V
C607,
608
ECCD2HO70D
ECCD2H120K
Ceramic,
12pF,
500V,
+10%
C613,
614
ECCD2H820K
Ceramic,
82pF,
500V,
+
10%
ECCD1H100K
ECQU1A103MD M
C1002,
1003
”
ECQU1A103MD
Polyester,
0.01K#F,
125VAC,
+20%
ECQU1A103MC (MC)
XBA1F80NU14
XBA2E80NS5
Fuse,
8A
(250V)
Fe
te
F2
XBA1F20NU14
XBA1E20NS5
Fuse,
2A
(125V)
ee
|
F3
XBA1F16NU14
XBA1E16NS5
Fuse,
1.6A
(125V)
F4
-
XBA2E40NS5
Fuse,
4A
(250V)
SWITCHES
SSL15 | Switch, Power Source
SSR53S Switch, Voltage Adjuster
CABINET and CHASSIS PARTS
SGP1110A
| SGP1110B
RJA10A
SJA83
AC
Cord
RJS31-1 Socket, DIN (Tape REC/PLAY)
XWC3BFZ Washer
XTB3+8BFZ Screw, DIN Socket M'tg
XSB3+6BFZ Screw, Voltage Adjuster Switch M'tg
» ACCESSORIES
RJP74-1 Piug Adapter, Power Source
RJP75 Plug Adapter, Power Source
PACKING PARTS
SGP1110-1A Rear Panel
SPS1387
SPS1385
SPS1383
SPS1381
SPG1345
SPG1347
SQF1755
SQF1757
SPS1521 Pad, Right Side
SPS1519 Pad, Left Side
SPG1377 Carton Box
SQF1831 Instructions Book, Printed Matter

m EXPLODED VIEWS
XTN3+8BFZ
Ԥ7)SJV1401-1 ee
§4) SHO3X1F
Part No.
GOR
XSB3+6BFZ
J
aad
oe
RJS31-1
g
co
QBSIAB3
|
HR1i1
Bar
Antenna
Mounting
(With
Bar
Antenna)
i
SJSA66-1
Bar
Antenna(L201)
C2
ain
Vi
Bar
Antenna
Mounting
2
(With
Bar
Antenna)
XSN3+14BNS
67)SJF8003
Part Name & Description
XWC3BFZ
SNE55
XTN3+8B
SHD3XIF
SDR1
SMM23
SJV1401-1
XWA3BFN
XSN3+14BNS
SJF4411
SJF4411-1
SJF3421
SIF 3223
SDZ051-2
SDSA4121
SDD53
SJF8003
SGP1110-1A
XTN3+8BFZ
SHR401-1
XCJ6P21B
SJSA66-1
RHR111
SJA83
SBM41
SBM9007
SJP9205-1
SGX763
SHP641
SJP9205-1
RJS31-1
XWC3BFZ
XTB3+8BFZ
XSB3+6BFZ
Washer, Fuse Circuit Board Screw
Lug, Ground
Screw, Meter Bracket M’tg
Shaft, Pulley
Pulley, Dial
Bracket, Meter
Socket, Power Transistors
Washer, Power Transistors Screw
Screw, Power Transistors M’tg
Terminal, Speakers (Left)
Terminal, Speakers (Right)
Terminla, Pre Out-Main In
Terminal, 4CH Max Out and AM Stereo Out
Cord, Dial 86-9/16" (220cm)
Spring, Dial Cord
Drum, Dial Cord
Terminal, Input and Antenna
Rear Panel
Screw, Terminal and Rear Panel M‘tg
Lock Pin, Terminal M’tg
Jack, Headphones
Socket, AC Outlet
Bushing, AC Cord
AC Cord
Magnet, Relay
Bracket, Magnet
Short pin, Pre & Main Amp Connection
Mirror, Dial Scate
Shading, Cloth
Short Pin, Pre & Main Amplifier
Socket, DIN (Tape REC/PLAY)
Washer
Screw, DIN Socket M‘tg
Screw, Voltage Adjuster M'tg
SHR401-1
XTN34+8BFZ
69
XTN3 + 8BFZ
68)
SGP1110-1A
Per
set | [
BOP WW
2
BaNougsooaa
NNNANWSENANH=

SA-800
m SCHEMATIC DIAGRAMS
@ Power source
f
UNSWITCHED
AC LINE
"| Cd 120 (60Hz)
S16
—_o-—-B-
C1003 0,01
/ R702, F3 1.64
6
C1002 0,01
SWITCHED
7 S18-1,S18-2
| Voltage adjuster switch in “110” position,
@110V-+@ 120V-+@ 220V-"@ 240V
C1003 0.01
AC LINE
110/ 120/220/240V
(50/60Hz )
£1008 00!
SWITCHED
UNSWITCHED
AC OUTLETS
REC OUT
R1007 47K
“PLAY BACK Wv
-REC OUT 7
PLAY BACK 5
-REC OUT
Ri008 47K
'~PLAYBACK (O
>-REC OUT
TAPE 2
—PLAYBACK (O
REC/PLAY
R1005 47K
@ Tape deck connection terminal
p-REC OUT
“PLAYBACK
REC OUT
LPLAYBACK (Q-——-___5
change
REC OUT
PLAYBACK
REC OUT
“PLAYBACK
R1003 100K
Printed in Japan
[4] 78040560 @

ORDER NO. SD7801-1295
Service
Manual
FM/AM STEREO RECEIVER
SA-800
(M), (MC)
e The model SA-800 (M) is available in America only.
e The model SA-800 (MC) is available in Canada only.
Simulated wood cabinet
TECHNICAL
SPECIFICATIONS
(Specifications
are
subject
to
change
without
notice
for
further
improvement.)
POWER AMPLIFIER SECTION
Rated minimum sine wave RMS power output
20Hz ~ 20kHz
both channels driven
0.04% total harmonic distortion
125W per channel (8 ohms and 4 ohms)
1kHz continuous power output
both channels driven
0.04% total harmonic distortion
Output voltage
PRE OUT
REC OUT (TAPE1, 2)
Acoustic controls (at tone “0” position)
LOW boost
HIGH boost
FM TUNER SECTION
Frequency range
Sensitivity
rated 1V, maximum 3V
150mV
100Hz, +6dB
10kHz, +6dB
88 ~108MHz
10.3dBf
Technics
135W per channel (8 ohms and 4 ohms)
Total harmonic distortion
0.04% at rated power (20Hz ~ 20kHz), 8 ohms and 4 ohms
0.015% at half power (20Hz ~ 20kHz), 8 ohms
0.025% at half power (20Hz ~ 20kHz), 4 ohms
0.005% at half power (1kHz), 8 ohms and 4 ohms
intermodulation distortion 0.04%
SHz ~ 90kHz, “dB
112dB
0.4mV
50 (8 ohms), 25 (4 ohms)
1V/100 kilohms
4 ~ 16 ohms
8 ~ 16 ohms
Frequency response
S/N (IHF, A)
Residual! hum and noise
Damping factor
Input sensitivity and impedance
Load impedance MAIN or REMOTE
MAIN + REMOTE
PREAMPLIFIER SECTION
input sensitivity and impedance
PHONO
AUX
PLAYBACK (TAPE 1, 2}
PHONO maximum input voltage (1kHz, RMS)
S/N (IHF, A)
PHONO
AUX
Frequency response
PHONO
AUX
2.5mV /47 kilohms
150mV/47 kilohms
150mV/47 kilohms
200mV
83dB
97dB
RIAA standard curve +0.2dB
+0
20Hz ~ 20k Hz,_ 9308
+0,
_798
10Hz ~ 40 kHz,
Tone controls
BASS
MIDDLE
TREBLE
Loudness control (volume at —30dB)
High filter
Low filter
Muting
50Hz, +12dB ~ —12dB
1kHz,+7dB ~—7dB
20k Hz, +12dB ~ —12dB
50Hz, +9dB
7kHz, —6dB/oct.
100Hz, —6dB/oct.
—20dB
Panasonic Company
Corporation of America
One Panasonic Way, Secaucus,
by Panasonic
New Jersey 07094
Division of Matsushita Electric 320 Waiakamilo Road, Honolulu,
Hawaii 96817
1.8uV (IH F ‘58)
50 dB quieting sensitivity
MONO
STEREO
Total harmonic distortion
MONO
STEREO
S/N MONO
STEREO
Frequency response
13.2dBf, (2.5uV 'H F 58)
36.2dBf, (35.4yV iH F ‘58)
100Hz 0.15%, 1kHz 0.1%, 6KHz 0.3%
100Hz 0.3%. 1kHz 0.2%. 6kHz 0.4%
7748
73dB
20Hz ~ 18kHz, * 0-208
80dB
1.00B
85dB
40008
400dB
60dB
Alternate channel selectivity
Capture ratio
Image rejection at 98MHz
{F rejection at 9SMHz
Spurious response rejection at 9IIMHz
AM suppression
Stereo separation
1kHz
10kHz
Leak carrier
Antenna terminals
45dB
35dB
—70 dB (19kHz), -50 dB(38kHz)
30), 750
AM TUNER SECTION
525 ~ BOSkHz
30uV, SOKV/m
35dB
50dB
45dB
Frequency range
Sensitivity
Selectivity
Image rejection at 1000 kHz
IF rejection at 1000 kHz
GENERAL
Power consumption 330W (only for &m erica)
600VA (only forCa nada)
AC 12(V 60Hz
222%" x B4"x 155%"
(582 x 177 x 193)mm
41.9 tk ( 19kg)
Power supply
Dimensions (W x H x D)
Weight
Weights and dimensions shown are approximate.
Matsushita Electric of Hawaii, Inc. Matsushita Electric ¢ Ccanada Ltd.
40 Ronson Drive, Redale,
Ontario, Canada MYWV 1B5

m LOCATION OF CONTROLS
POWER DISPLAY RANGE ( a= XO.1 Mi X1)
POWER DISPLAY (= OFF MLON)
FM MPX FILTER (1 OUT = INCREC ))
FM HI-BLEND ( f OFF .= ON)
SIGNAL STRENGTH METER
FM TUNING METER
ey
a et (AM/FM AUTO/PHONO/AUX)
TAPE MONITOR (TAPE 1/SOURCE/TAPE 2)
REC MODE (TAPE 1»2/SOURCE/TAPE 2» 1)
FM MUTING (ON/OFF)
(BOOST/OFF/FILTER) LOW MODE (STEREO/MONO)
(BOOST/OFF/FILTER) HIGH
(OFF/ON)
ACOUSTIC
CONTROL
(0dB/—20dB)
AUDIO
MUTING
BALANCE
LOUDNESS (OFF/ON)
POWER LEVEL INDICATOR
LEFT RIGHT
.
AM BAR ANTENNA
PRE AMP OUTPUT
MAIN AMP INPUT
AC OUTLETS
AM STEREO OUT
4CH MPX OUTPUT
AM ANTENNA
FM ANTENNA (75Q)
MAIN
Es SPEAKER
REMOTE
© SPEAKER
PLAYBACK
REC OUT
FM
ANTENNA
(3009)
TAPE
DECK
1
GROUND
PHONO
INPUT
PLAYBACK
TAPE DECK 2
AUX
INPUT
REC
OUT

SA-800 SA-800
POWER AMP DRIVE/PROTECTION CIRCUIT POWER TRANSISTORS
TRANSFORMER TAP SELECTION CIRCUIT
&
FUSES
FM RF CIRCUIT
VARIABLE CAPACITOR
FM IF AMP/AM CONV.
RELAY
(PROTECTION/
FM IF AMP
FM MPX
LOGARITHM
MPX
FILTER
COMPRESSOR
CIRCUIT
TECHNICAL GUIDE
™@
AUTOMATIC
SELECTION
CIRCUITRY
FOR
MAIN
AMPLIFIER
POWER
VOLTAGE.
(TRANSFORMER
COIL
TAP)
This
circuitry
functions
to
maintain
the
main
amplifier
in
a
stabilized
operating
condition
by
detecting
the
DC
resistance
of
the
speakers
connected
to
this
unit,
and
then
making
the
changeover
to
the
high-voltage
power
trans-
former
coil tap
if
the
load
is
80
or
more, or
to
the
low-voltage
tap
if the load
is
61
or
less.
MAIN
(SPEAKER)
AC
120V
o—{1)
REMOTE
|
{
—¢-0--0—{R) MAIN
i
(SPEAKER)
|
ro SPEAKER DC RESISTANCE o—(R) REMOTE
DETECTION CIRCUIT | i |
| RELAY DRIVE CIRCUITRY BY
| |
|
|
I
|
D903
Fig. 1
Operation principles
1.
If
speakers
with
an
impedance
of
62
or
less
are
to
be
con-
ea
nected
to
the
left
and
right
“MAIN”
or
“REMOTE”
speaker
9
terminals
(Fig.
2).
-—+-
COMPARATOR $ $
After the speakers are connected to this unit, turn on the
power switch. The muting circuitry of this unit will function 6V
for about 5 seconds, until output from the main amplifier .
appears
at
the
speaker,
thus
maintaining
the
muting
relay
1c301
3
aiveor
(RLY601)
in
the
condition
shown
in
figure
1.
Speaker
impe-
teaon
dance
is
detected
during
this
interval.
With
RLY601
in
the
:
2
3]
condition
shown
in
figure
1,
the
speakers
will
be
connected
in
hr
parallel to point @) of the speaker DC resistance-detection
circuitry, and the voltage at point (b) will decrease. With a
reference
voltage
of
1.5V
applied
to
terminal
@
of
the
Fig.
2
comparator (IC901), a voltage of 6V will appear at terminal
@
when
the
voltage
of
terminal
@
becomes
lower
than
that
of
terminal
@.
In
other
words,
the
output
voltage
of
terminal
8)
activates
TR902
and
TR901
of
the
relay-drive
circuitry,
and
the
tap-selection
relay
(RLY701)
switches
over
to
the
low-voltage
tap.
When
80
speakers
are
connected
to
the
“MAIN”
and
“REMOTE”
speaker
terminals
and
both
speaker
switches
are
on,
total
impedance
becomes
422,
and
operation
becomes
the
same
as
when
speakers
of
6
or
less
are
connected.
2. lf speakers with an impedance of 89 or more are to be
connected to the left and right ‘“MAIN” or “REMOTE”
speaker terminals (Fig. 3).
COMPARATOR
The detection method is the same as when Speakers with an
impedance of 6 or less are connected. In this instance,
however, the voltage of terminal @ of the comparator
becomes higher than the reference voltage of terminal @),
and no output appears at terminal 8) . AS a result,
q because the relay-drive circuitry does not operate, the relay
(RLY701) remains switched to the high-voltage tap.
Fig. 3
.
If
a
speaker
with
an
impedance
of
8
is
connected
to
the
left
“MAIN”
or
‘“REMOTE”
speaker
terminal,
and
a
40
speaker is connected to the right terminal.
The detection method is the same as when speakers with an impedance of 82 or less are connected. In this instance,
however, the 6V voltage can be obtained only from terminal 3) of the right channel comparator (1C902). This
voltage is applied to terminal @) of the left channel comparator (1C901), and then, because the voltage of terminal
@ of 1C901 becomes high, it can be seen that the voltage of terminal @ of 1C901 becomes equivalently low. As
a result, a 6V voltage can be obtained at terminal B) of 1C901, and the relay (RLY 701) switches the power trans-
former over to the low-voltage tap. This operation is the same as when a 42 speaker is connected to the left speaker
terminal and an 8Q speaker is connected to the right terminal.
Operation principles 1, 2 and 3 above are an explanation of the circuitry which detects speaker impedance after the
power is turned on and until the main amplifier output is emitted to the speakers. The following is an explanation
of the circuitry which detects impedance when the output is being emitted.

4. Trigger-pulse-generation
circuitry MAIN AMP
Let> RELAY B
oe, EN reea : 2. ~” OLEFT SPEAKER
This
is
circuitry
which
gene-
°
OOFF
PULSE
OUT
ere
rates a positive pulse when a $13 @1 (s13)
speaker switch is switched 1 OON C913 D909
from off to on while this unit ie tt + ®
is operating, and generates a Baie bss fra
negative pulse when the +Bo WWW 1 +¢ © 6)
switched from on to off (Fig. 4). ool freus
@ When the speaker switch
(S13) is on, positive vol- Fig. 4
tage (+B) is charged to C912 and C913.
(@)
When
the
speaker
switch
is
switched
from
on
to
off,
the
charge
applied
to
C912
is
suddenly
discharged,
D908
becomes
forward
biased,
and
a negative
pulse
can
be
obtained from
in
figure
4.
@
When
the
switch
is
switched
from
off
to
on,
a
positive
voltage
(+B)
is
suddenly
charged
to
C913.
D909
becomes
forward
biased,
and a positive
pulse
can be
obtained from
@
in
figure
4.
5, When a speaker switch is switched from off to +B
on.
D906
In this instance, as explained in item 4, a posi- re 7
tive pulse is generated from the trigger-pulse-
generation circuitry. This pulse is applied to O3sec
the mono-stable multivibrator shown in figure
5. TR905 of this circuitry is usually maintain- me to ON
ed in the “off’’ condition, and TR906 in the
“on” condition. When a positive pulse is
applied to the base of TR905, it becomes on,
and the collector becomes ground potential. Fig. 5
However, because this transistor becomes on only at the instant that the positive pulse is applied, the collector
also returns to positive potential about 0.3 second later. During this interval of about 0.3 second, the TR907
muting-relay-drive transistor becomes off, and RLY601 becomes in the condition shown in figure 1. Then speaker
impedance is detected as described in items 1, 2 and 3, and the tap-selection circuitry is activated.
RLY601 to OFF
. When a speaker switch is switched from on to off
In
this
instance,
as
explained
in
item
4,
a
negative
pulse
is
generated
from
the
trigger-pulse-generation
circuitry.
This pulse
is
applied
to
the
mono-stable
multivibrator
shown
in figure
6.
TR903
of this circuitry
is
usually main-
tained
in
the
“on”
condition,
and
TR904
in
the
“off”
condition.
TR903
becomes
off
only
at
the
instant
when
a
negative
pulse
is
applied
to
its
base,
and
positive voltage
appears
at
the
collector.
C909 is
charged
by this voltage,
and,
at
the
same
time,
TR904
becomes
on.
When
TR904
becomes
on,
the
collector
becomes
ground
potential,
and,
in
the
same
way
as
explained
in
item
5,
this
circuitry
also
returns
to
the
“off”
condition
after
about
0.15
second.
In
this
way,
the
TR904
collector
and
the
impedance
detection
circuitry
are
connected
by
way
of
D903.
During
the
time
that
the
TR904
collector
is
ground
potential,
D903
becomes
forward
biased,
and,
therefore,
the
comparator
function
is
simultaneously
reset
when
TR902
of
the
tap-selection
relay-drive
circuitry
becomes
off.
In
addition,
the
collector
potential
of
TR903
also
returns
to
ground
potential
after
about
0.3
second.
At
this
time,
the
charge
until
now
applied
to
C909
is discharged,
and the
negative
pulse
here generated
is
applied
to
the base of
TR906.
Then
TR906
becomes
off,
and,
as
explained
in
item
5,
the
collector
of
TR905
becomes
ground
potential,
and
the
negative
pulse
turns
off
the
TR407
muting-relay-drive
transistor
for
about
0.3
second.
During
this
interval,
the
Operation
of
the
speaker
DC
resistance-detection
circuitry
is
as
already
explained
in
items
1,
2
and
3.
Note
that,
as
shown
in figure
6,
time
delays
occur
in
each
of
the pulses.
oe FROM
4 aN ae = SPEAKER SWITCH
OV |
ay
015
oi
Ss
RESET
PULSE
2Sec ov-—-
\
he1015sec
+—~—
C909
RESET
PULSE
ov
CHARGE
PULSE
am D903
ov o—p
+
0.i5sec i TR9O6
eae INPUT PULSE
- RLY601
OV
OFF
PULSE
03sec
O3sec
[RELAY PULSE | PULSE
Fig. 6
@ POWER-INDICATION CIRCUITRY
fe) 0
POWER AMP Lr aaa Y ¥ Wr
The power amplifier output signal is attenuated
by the sensitivity selector, and is applied to the
logarithmic-compression circuitry. In this cir-
cuitry, as shown in figure 7, the output chara- forte Sencetn
cteristics change logarithmically in relation to CIRCUITRY
input, and the output is applied to the window Fig. 7
comparator IC. Here, the pulse waveform -—
becomes as shown in figure 8, and the indicator
illuminates according to the input of the IC INPUT
(the output of the power amplifier).
WINDOW
COMPARATOR;
LOGARITHM
COMPRESSOR
WINDOW
COMPARATOR IC
(paxtals e
LIGHT UP PULSE
Fig. 8
_ (Low) a . oes
1,2 SOM FICT m@ TONE-CONTROL CIRCUITRY
ee > ‘ on (TONE)
TREBLE i gee Configuration is as shown in figure 9. Bass and
(HIGH) Y] treble are the BAX type of control circuitry,
= a= im ~~] and a bandpass filter is used for control of
intermediate frequencies. If the middle control
(eabet is moved in direction A, a valley-like charac-
AAI S crenteioe teristic can be obtained. If it is moved in
TY] > direction B, a peak-like characteristic can be
obtained. Note that the input signal will bypass
the tone-control circuitry if the acoustic cont-
Fig. 9 rol (“TONE”) is set to the “OFF” position.
BAND PASS FILTER
B PROTECTION CIRCUITRY
When DC voltage appears at the speaker terminals of this unit, there is protection circuitry to shut off the speaker
relays and thus protect the speakers from damage, as well as protection circuitry which short-circuits the input and
prevents the signal from being applied to the main amplifier, thus protecting the power amplifier from damage caused
by overload or short-circuitry of the speaker terminals.
Sisinecitais sieinatsescias bt

M@ POWER TRANSISTOR PROTECTION CIRCUITRY
When speaker terminals are shorted or an overload voltage is applied to the power
transistor, the emitter resistance voltage of the power transistor is applied to
terminals 2 and 3 and to terminals 13 and 14 of IC903. This voltage actuates the
switching circuitry of |C903, and positive voltage from terminal 4 turns on TR909.
When this happens, the TR909 collector
becomes ground potential and TR916
becomes off, thus causing the safety indica-
tor connected to TR916 to extinguish. In
addition, positive voltage also appears at
terminals 9 and 10 of IC903; TR910 and
TR911 become on; and the main amplifier
input is shorted. Note that, once the prote-
ction circuitry has operated, the circuitry
will remain in the “hold’’ condition even
though the abnormality is corrected. Thus,
if the safety indicator goes out, the power
should be turned off, and not turned on
again until first it is confirmed that there is
no abnormality.
(DRIVER) (POWER)
TREO! +B
TREIS
$-— OUTPUT
TR611 TR616
AW =B
Wi
+B
ae == (C903 3 (DRIVER) (POWER)
| TR610, +B
HOLD
A TR61S
—foerecrork CIRCUITRY |
| Co fence] | OUIEUL
| TR612,
| swITCHING L$ [SWITCHING |
-B;
TRE2
| ge = | oe
k- prtaien mn Osied
a
To Safety +B ae ae
TRSI6 SUPPLY
Indicator- ! TR909 Input ftch- s
Line (Reh,
DC PROTECTION
TR910 TRON Relay "CIRCUITRY
Fig. 10
mw ALIGNMENT INSTRUCTIONS ...... Main Amplifier Circuitry
¢ Main amplifier (ICQ) alignment
1. The “ICO” adjustment should be started about 5 minutes after
setting the power switch to the ON position.
2. Speakers switch to ‘‘push” position.
3. Connect DC voltmeter between TP601 and (+) speaker termi-
nal of right channel.
4. Adjust VR602 to 13 mV on DC voltmeter indication.
5. Connect DC voltmeter between Emitter (TR613) and @)
speaker terminal of left channel.
6. Adjust VR601 to 13 mV on DC voltmeter indication.
¢ Power level indication alignment
1. Connect AC VTVM to speakers terminal. (Left and Right channels)
2. Power display switch to “ON” position and display range
switch to “XO. 1” position.
. Selector switch to “AUX” position.
. Apply a 1kHz signal to “AUX” terminal.
. Adjust supply signal level to 12.6V ~ 12.7V output voltage.
3
4
5. Volume control to maximum position of set.
6
7
. Adjust VR801
until “200W”’ indicator lights up.
e¢ Power transformer tap selection circuitry alignment
Notes: o
Resistors connected to speaker terminals should
be of low tolerance (1% ~ +2%).
o Each channel to be adjusted separately.
1. Set volume control to minimum position and speaker
switch to ‘‘on”’ position.
2. Connect oscilloscope between TP1 and chassis for left
channel, and between TP3 and chassis for right channel.
(Set to voltage measurement range.)
3. Connect 6.50 resistor (or 12Q and 152 coil resistors in
parallel) to left channel speaker terminal.
4. Short TP2 and TP4 to chassis.
5. Adjust VR901 and VRQ02 so that TP3 output voltage is
from about OV to about 6V.
6. Connect 6.529 to right channel, and adjust VR903 and
V R904 so that TP1 output voltage is from about OV to
about 6V.
(Left and Right channels)
(Left channel) and VR802 (Right channel)
[SPEAKER TERMINAL] DC Voltmeter
ze . et
ro
rant
© 2
VREO2
= TP601
I<
MAIN AMP
VR601
Emitter
of TR613
nae
Ls
u——7 7
MAIN REMOTE. DISPI
~ (ON)
{SPEAKERS TERMINAL |
(LEFT) ale
20
ALcon)
LAY RANGE
om (X01)
OSCILLOSCOPE
iS)
150 4) 0,00)
eo
| Ase ‘ite | RaCHASSIS
' frria¢, |
| TP3
[vRs02
TR4
j
i SX TP2
CHASSIS
R
[vR903"
——— [vega]
DC VOLTMETER
TTY
@ @
Zaller
fetes
(Vy
7.
After
adjustment,
remove
6.50
and
wire
shorting
TP2
and
TP4.
8. Measure TR613 collector voltage when 8 speakers are
connected to speaker terminals.
9. Next, connect 60 speakers to speaker terminals, and
confirm
that
TR613
collector
voltage
is
about
10V
lower
than
voltage
measured
in
item
8.
[7]

m@
ALIGNMENT
INSTRUCTIONS
......
FM/AM
Tuner
Circuitry
Notes:
1. Muting switch ........ OFF 5. Mode switch.......... MONO
2. Band selector switch ..... AM/FM AUTO (FM, RF FM.-IF) 6. Maintain tine voltage at 120 volts.
3.
FM
muting
switch.....
..,
OFF
7.
3002
FMdummy
antenna.........
Refer
to
fig.
1
4.
Speaker
switch..........0N
8.
Output
of
signa!
generator
should
be
no
higher
than
necessary
to obtain an output reading.
INDICATOR
(AC VTVM or SCOPE)
(DISTORTION METER)
AM ALIGNMENT
SIGNAL GENERATOR DIAL
SETTING
CONNECTION | FREQUENCY
ADJUSTMENT
POINTS
REMARKS
Plat
side
shrovan
T2010
tase
iF)
(A)
1
0.0014F
to
AM
antenna
455k
Hz
Point
of
non-
Connect
VTVM
or
scope
7201
(1st
JET)
(8)
Adjust
for
maximum
trimmer
terminal.
(30%
Mod.
inter-ference
to
TP201.
through
0.
1KF
E
output.
Common
to
chassis.
with
400Hz)
T202
(2nd
IFT)
Move
L201
as
shown
Fashion
loop
of
several!
in
‘alignment
points”
turns
of
wire
and
radiate
GOOKH2
Connect
VTVM
or
Scope
L202
(OSC
Coil)
Adjust
for
maximum
#
cghalinto
leap
of
rece!
os
Med
|
O0OKr
2
lorspeaker
tenmirrals
L201
(ANT
Coil)
output,
Adjust
ferrite
signal
into
loop
of
receiver
with
400Hz}
Of
receiver:
put,
Adj
core
of
L201
by
screw driver.
Adjust for maximum
Fashion
loop
of
several
1500k
Hz
Connect
VTVM
or
scope
:
3]
turns
of
wire
and
radiate
(30%
Mod.)
1500k
Hz
to
speaker
terminals
aes
at
SUA
ad
ablaaa
steps
(2)
and
(3)
signal
into
loop
of
receiver
with
400Hz}
of
receiver.
Pp
.
{|
es
_L
FM-IF
ALIGNMENT
2
Point
of
non-
T102
(DISCRI
IFT)
(A)
|
Adjust
for
center
3
No
Signal
inter-ference
Tuning
meter
of
set
a
Orange
Core
|
position
of
tuning
meter.
FM-RF ALIGNMENT
L7 (OSC Coil) : :
Connect
to
FM
3000.
9O0MHz
Connect
scope
to
L5
(RE-DET
Coil)
Adjust
for
maximum
5] antenna terminal through (100% Mod. QOMHz speaker terminals of L2 (RE-DET Coil) amplitude and sym-
FM
dummy
antenna.
with
400H.z)
receiver.
L1
(ANT
Coil)
metrical
curve.
T101 (FM IFT) (Refer to fig. 4)
Connect
to
FM
300
106MHz
Connect
scope
to
CT4
(OSC
Trimmer)
Adjust
for
maximum
am-
6] antenna termina! through (100% Mod 106MHz speaker terminals of CT3(RF DET Trimmer) pusige and symmetrical
FM
dummy
antenna.
with
400Hz)
receiver.
CT2
(RF
DET
Trimmer)
Repeat
steps
(5}
and
(6).
CT1 (ANT Trimmer)
FM MONO DISTORTION ALIGNMENT
Connect
to
FM
300Q
1OQMHz
Connect
distortion
meter
T102(DISCRI
IFT)
(B)
Adjust
for
minimum
7]
antenna
terminal
through
(100%
Mod.
1OOMHz
to
speaker
terminals
Green
Cot
distortion
meter
,
FM
dummy
antenna
with
400H
2)
of
receiver
eer
&
indication
4
Apply 60 dB to set.
FM MUTING LEVEL ALIGNMENT
FM muting switch
to "ON".
M103 Adjust to that output
can be obtained.
Connect to FM 3002) 1OOMH2
antenna
terminal
through
(100%
Mod
100MHz
FM
dummy
antenna.
with
4007)
Apply 16dB (6.3uV) to set
Connect VTVM or scope
to speaker terminals.
FM SIGNAL METER ALIGNMENT
1
Apply
100MHz
FM
signa!
of
100d8
(400Hz
30%
modulation)
3
Adjust
VR102
for
about
4.7
point
of
signal
meter
indication.
to
FM
3002
antenna
terminal
through
FM
dummy
antenna
2
Tuning
at
1OOMHz.
FM MPX PILOT ALIGNMENT
Using
a
frequency
counter
Using
alternate
system
{
j
1
98MHz
Non-modulated
mono
signal
applied
to
set
1
Apply
stereo
signa!
from
generator
or
stereo
station
to
receiver
10]
2
Muting
switch
to
"ON".
2
Adjust
VR301
until
stereo
indicator
lights
up.
Cement
arm
of
3
Connect
frequency
counter
to
TP302
through
resistor
(100k)
VR301
as
shown
in
fig.
2.
4
Adjust
VR301
to
19kHz,
+30Hz
Notes:
1.
Stereo
modulator
*
Connect
stereo
modulator
output
to
EXT
MOD
terminal
of
signal
generator.
¢
Pilot
signal
modulation
to
‘10%’
2.
FM
signal
generator
*
Frequency
approximatery
100MHz/Output
level
to
'’72dB
(HF}”
e
Modulation
mode
to
“FM”
3.
Selector
switch
to
“FM
AUTO”
4.
Mode
switch
to
“STEREO”
———
BEcae
on
STEREO
MODULATOR
INDICATOR
ADJUSTMENT
pena?
CONNECTION MODE & MOD. RATE (AC VTVM} | POINTS
FM MPX PILOT CANCEL ALIGNMENT
A Tuning at 1OOMHz
FM
3002.
antenna
19kHz(Pilot)
signal
|
Connect
AC
VTVM
or
.
:
:
eit
11]
terminals
through
FM
10%
ae
scope
to
speaker
a
*¢
FM
Muting
switch
to
“ON
dummy antenna. terminals. ¢ Make adjustment to bring the
output to minimum.
FM MPX FILTER ALIGNMENT
¢ Tuning at 1OOMHz
FM
3002
antenna
38kHz
100%
Connect
AC
VTVM
or
°FM
Muting
switch
to
“ON”
.
72) terminals through FM Modulation scope to speaker an eFM Hi-blend switch to ‘OFF
dummy
antenna.
{External
Modulation)
terminals.
¢
FM
MPxX
Filt
switch
to
“IN
¢ Make adjustment to bring the
i output to minimum,
FM
STEREO
SEPARATION
ALIGNEMNT
i
|
*
Tuning
at
1OOMHz
i
FM
300f
antenna
(1kHz
30%
Modulation)
|
Connect
VTVM
to
speaker
¢
Make
adjustment
so
that,
when
i
13]
terminals
through
FM
MODE
L
(and
R})
terminals
through
low
pass
VR303
the
antenna
input
is
subjected
to
t
dummy
antenna.
Pilot
signal
to
"ON"
filter.
.
L
modulation
{or
R
modulation),
(Refer
to
fig.
3)
R
channel
output
(or
L
channel
output) becomes minimum.
Sma tte ton ain ttt