Technics QUARTZ SA-R177 User manual

ORDER NO. AD8907222C3
Service
Manual
Receiver
CYUARTZ
Synthesizer
S
A-
R
4
77
AM/FM Stereo Receiver
Color
(K)... Black Type
Area
Country
(gn)
SPECIFICATIONS. nin 45 500)
AMPLIFIER SECTION
Power output Headphones output level and impedance 430 mV/330 Q
DIN 1kHz 2 x 50W(8Q) Load impedance
40 Hz~ 20 kHz continuous power output AorB 8O~160
both
channels
driven
2
x
40W(8Q)
A
and
B
8
Q~16
0
Total harmonic distortion
rated power at 40 Hz~ 20 kHz 0.3 % (8 Q) @i FM TUNER SECTION
half power at 1 kHz 0.07 % (8 Q) Frequency range 87.50 ~ 108.00 MHz
intermodulation distortion Sensitivity
rated power at 60 Hz: 7 kHz= 4:1, SMPTE, 8 Q 0.5% SIN 30 dB 1.5 pv (75 Q)
Power
bandwidth
SIN
26
dB
1.3
WV
(75
Q)
both channels driven, —3 dB 10 Hz~40 kHz (8 Q) SIN 20 dB 1.2 pV (75 Q)
Damping
factor
__
20
(8Q)
IHF
usable
sensitivity
1.5
pV
(IHF'58,
75
Q)
sr pclae and impedance so ileres IHF 46 dB stereo quieting sensitivity 22 pV/75 Q
mv/4
CD, VCR 1, TAPE/VCR 2 200 mV/22 kQ ste eri almontion soe
PHONO maximum input voltage (1 kHz, RMS) 150 mV STEREO 03 9%
SIN
Sin
=
rated
power
(8Q)
MONO
60
dB
(75
dB,
!HF)
PHONO
70
dB
(IHF,
A:
80
dB)
STEREO
58
dB
(7!
dB,
IHF)
Seatac 2 SO/GE (IRIE 20 Oe) Frequency response 20 Hz~15 kHz, +1 dB ~—-2 dB
PHONO
RIAA
standard
curve
lee
tiled
selectivity
fe
oe
+0.8 dB (30 Hz~ 15 kHz) ;
4
CD, VCR 1, TAPEIVCR 2 10 Hz~70 kHz (+3 dB) Ermeceeaieeue of :
5 band graphic equalizer 80 Hz, —10 dB~ +10 dB Spurious response rejection at 98 MHz 70 dB
ee eae eupresion 8
2, Stereo separation
4 kHz, —10 dB~ +10 dB 4 kHz 40 dB
12.5 kHz, -10 d(B~+10 dB 10 kHz 30 dB
Loudness control (volume at—30 dB) 50 Hz, +9 dB Carrier leak
Output
voltage
19
kH
—30
dB
(—3§
dB,
IHF
VCR 1, TAPEIVCR 2 REC OUT 200 mV ante ero ia dG. iB
Channel
balance,
250
Hz~6,300
Hz
md
Channel
balance
(250
Hz~
6,300
Hz)
+1.5
dB
Channel separation 55 dB Limiting point 1.2 uv
i echnics Matsushita Electric Industrial Co., Ltd.
Central P.O. Box 288, Osaka 530-91, Japan

SA-R177
Bandwidth
Wi
GENERAL
IF
amplifier
180
kHz
FM
demodulator
1000
kHz
os
oe
ow
Antenna
terminals
75
Q
(unbalanced)
For
Oceania
AC
50
Hz/60
Hz,
240
V
For
Third
Region
AC
50 Hz/60
Hz,
110
V/127
V/220
V/240
V
ll
AM
TUNER
SECTION
Danenstons:(WHtx:P)
_
430
x
114
x
300
mm
Frequency
range
522
kHz~
1611
kHz
(9-kHz
steps)
Weight
NG
ae
a
cou
530
kHz
~
1620
kHz
(10-kHz
steps)
9
kg
(13:90)
Sensitivity
(S/N
20
dB)
20 pV,
330
pV/m
Selectivity
at
999
kHz
55
dB
Note:
Image
rejection
at
999
kHz
40
dB
Total
harmonic
distortion
is
measured
by
the
digital
spectrum
IF
rejection
(at
999
kHz)
55
dB
analyzer.
i
CONTENTS
Page
Page
CONNECTIONS
TO
EQUIPMENT
............00e
ee
eeee
2
BLOCK
DIAGRAM
.........
000
e
ence
eee
13
~
15
BEFORE
USE
..
0
cc
ce
ce
teers
3
INTERNAL
CONNECTION
OF
FL...
2...
eee
ee
16
REMOTE
CONTROL
OPERATION
...........0
00
e
eee
3
SCHEMATIC
DIAGRAM
........0
2
eee
eee
ne
17
~
24
ACCESSORIES
.
0...
ec
ee
ee
eee
3
PRINTED
CIRCUIT
BOARDS
.......
2205
ce
ee
enae
25
~
31
FRONT
PANEL
CONTROLS
AND
FUNCTIONS.........
4,5
WIRING
CONNECTION
DIAGRAM
..........-.0.
e002
32
DISASSEMBLY
INSTRUCTIONS
............--e+005
6~9
EXPLODED
VIEW...
1...
0
ce
cer
ener
eens
one
33,
34
PROTECTION
CIRCUITRY
..
0...
0.
cee
eee
ee
tee
10
REPLACEMENT
PARTS
LIST
........-
0000
ee
ve
ee
35
~
38
BEFORE
REPAIR
...
20...
cc
eee
eee
eee
10
EXPLODED
VIEW...
cc
te
eee
wees
38
MEASUREMENTS
AND
ADJUSTMENTS
............
10,
11
RESISTORS
&
CAPACITORS
..........2-
00 ee
ueee
39,
40
TERMINAL
FUCTION
OF
IC...
1.
ee
ee
eee
12
Mi
CONNECTIONS
TO
EQUIPMENT
Antenna
connection
terminals
Speaker
connection
terminals
“GND” terminal
Voltage selector
(For (G) area only.)
~AC IN
REMOTE CONTROL
OUT TAPE
OUT BACK{}oUT BACK
AC IN socket( AC IN)
“PHONO”
terminals
(about 150pF)
Remote-control tape tersninal
(Connect a tape deck.)
Remote-control terminal
“TAPE/VCR
2”
terminals
(Connect
a
tape
deck
and/or
conmpact
disc
player.)
“VCR 1” terminals
“CD”
terminals
3
;
;
Phono
input
capacitance
is
about
140pF.

Mi BEFORE USE
Be sure to disconnect the mains cord before adjusting the
voltage selector.
Use a minus (—) screwdriver to set the voltage selector (on the
rear panel) to the voltage setting for the area in which the unit
will be used.
Mi REMOTE-CONTROL OPERATION
Tuner controls
play >
Compact disc player controls
Ped ShID dor
Mi ACCESSORIES
e@ AM loop antenna (1)
(SPB1162T)
FM indoor antenna (1)
(SSA269M)
e Screws (2)
(XTN3+10AFZ)
®Remote-control
transmitter (1)
(EUR64747)
®@ Flat cable for remote-controi (1)
(SWKST11M—1)
AM ‘FM preset tuning
co
Pplay Bye Use
See
Techni
Remote Controt Transmitter
System
SA-R177
(If the power supply in your area is 117 V or 120 V, set to the
“127 V" position.)
Note that this unit will be seriously damaged if this setting is not
made correctly. (There is no voltage selector for some countries;
the correct voitage is already set.)
Amplifier controls
eck
Bstoc sMoause
Cassette deck controls
Gise
C4
Disc number controls
ferries
AM antenna holders (2)
(SMA233—1M)
(SMA231M)
e AC power supply cord (1)
(RJA0004)
(SJA173)
@ Connection cable for
remote-control (1)
(SJP2257T)
© Batteries (2)
(UM-4NEP/2S)

SA-R177
Mi FRONT PANEL CONTROLS AND FUNCTIONS
Tuner section
L
[1] Power switch (power)
[2] FM stereo indicator (FM stereo)
This indicator automatically illuminates when an FM stereo
broadcast is being received.
Note:
It will not illuminate if the FM mode selector is set to the
monaural mode.
[3] Remote-control signal receptor
(remote sensor)
Receives the signals from the remote-control transmitter.
[4] Band selectors (band selector)
FM: Press this button to listen to an FM broadcast.
AM: Press this button to listen to an AM broadcast.
allocation: When the AM button is pressed for about 4
seconds, the AM frequency step will change to 10 kHz per
step. (This unit is set to 9 kHz before shipment.) In order to
return to the original frequency indications, press this button
for about 4 seconds again.
[5] Preset channel matrix display (tuner matrix)
When an entry is made to the memory, the figure’s outer
frame illuminates.
The outer frame of the “channel”
continuously.
now being received flashes
[6] Band indicators (AM/FM)
Indicates the selected band.
Memory indicator (memory)
This indicator illuminates when the memory button is
pressed.
[8]Audio input selector/frequency display
(input selector/frequency)
Displays the selected source or broadcast frequency.
Geers | Pero
[9] Quartz-lock indicator (quartz lock)
This indicator illuminates when the unit is tuned precisely to a
broadcast station.
Memory button (memory)
This button is used when presetting broadcast station frequen-
cies into memory.
[11] Group registration buttons (group)
These buttons are used to assign memory presets to the
desired group or to select the desired group.
[12] Music-scan/group-search button
(-M. scan/— group search)
This button is used to scan the memory presets within a group
(for about three seconds each) or to search for the desired
group.
[13] Preset-tuning buttons (1—0)
(24 channel random preset tuning)
These buttons are used to preset broadcast frequencies into
the memory of this unit, and to recall the desired Preset sta-
tions.
[14] Tuning buttons (tuning)
These buttons are used for tuning to the desired broadcast
station. !f the button is pressed momentarily and then releas-
ed, the frequency will change at intervals of 0.05 M Hz for FM
and 9 kHz (or 10 kHz) for AM.
fis] FM mode selector (FM mode)
This unit automatically switches to the stereo medé when an
FM stereo broadcast is received. This selector iS used to
select the mode (stereo or monaural) of FNM broadcast
signals.

SA-R177
Amplifier section
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nana Ceamoe anon |
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2 (CEEEREr rs |
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[1] Speaker selectors (speakers)
These selectors are used to select the speaker system(s) (A
and/or B).
(2] Tape indicator (TAPE)
This indicator will illuminate when the tape-monitor switch is
pressed.
[3] Muting indicator (muting)
This indicator will illuminate when the muting button (on the
remote-control transmitter) is pressed.
To cancel the muting function without using the remote-con-
trol transmitter, press and hold the “phono” input selector of
this unit for about 5 seconds.
Note:
The unit will switch to the phono mode.
[4] Loudness indicator (loudness)
This indicator will ituminate when the loudness button is
pressed.
[5] Equalization controls (graphic equalizer)
These controls are used to adjust the levels within each fre-
quency band. The levels can be varied over a range of
+10 dB~—-10 dB.
[6] Volume control/indicator (volume)
[7] Balance control (balance)
[8]Input selector buttons
(phono/tuner/CD/tape monitor/VCR 2)
These buttons are used to select the sound source to be
heard, such as a disc, radio broadcasts, etc. The selected
sound source is shown on the audio input selector/frequency
display.
(VCR1, tape monitor/VCR2, CD, tuner, phono)
[9] Tape-monitor/VCR 2 switch
Press this button to listen to a tape or a second VCR.
No other source selected by an input selector can be heard
while the tape indicator is illuminated. To listen to some other
source, press this switch once again.
(10|Loudness switch (loudness)
Set to the “on” position (the loudness indicator will il-
luminate); when listening to music at low volume. Auditory
perception of sound in the low frequency range falls off at low
volume, but when the switch is in this position, this deficiency
is compensated for, so that the full impact of the musical per-
formance can be enjoyed.
Headphone jack (phones)

SA-R177
Mi
DISASSEMBLY
INSTRUCTIONS
“ATTENTION SERVICER”
Some
chassis
components
may
have
sharp
edges.
Be
careful
when
disassembling
and
servicing.
ee
Removal
of
the
cabinet
Raa
Removal
of
the
front
panel
Procedure
@
Remove
the
5
screws
(Q@~
@).
pees
1.
Remove
the
1
screw
(
@).
1
2.
Remove
the
1
connector
(J705).
3.
Remove
the
3
flat
cables
(J502,
J604,
J605).
Cabinet
4. Remove the volume knob and nut.
5. Remove the 4 screws (Q@~@).
6.
Pull
out
the
front
panel
in
the
direction
of
the
arrow.
Removal of the power switch P.C.B.,
speaker switch & headphones jack P.C.B.
and power source P.C.B.
Ref. No.
3
Procedure
1 2 3
1. Remove the 3 screws (@ ~ @).
2. Remove the speaker switch & headphones
jack P.C.B. in the direction of the arrow.
Front panel
Removal of the FL/graphic equalizer
P.C.B.
1. Remove the 6 screws (@~ @).
2. Remove the FL/graphic
equalizer in the
direction of the
Speaker switch &
headphones jack P.C.B.
FL/graphic
equalizer P.C.B.
Power source P.C.B.

SA-R177
Removal
of
the
operation
P.C.B.
Removal
of
the
balance
VR
P.C.B.
@ Remove the 10 screws ( O~ @). 1. Remove the balance VR knob.
~>5 2. Remove the 1 screw( @).
Cellophane
tape
Ref. No.
7
Procedure
1-7
1. Remove the 1 connector (J705).
2. Pull out the volume knob in the
direction of the arrow.
3. Release the 2 claws.
Volume knob
Sf Volume knob
@ Pull out the volume P.C.B. in the
direction of the arrow.
Procedure
12-2 +8
Volume P.C.B.
i
;

SA-R177
Ref. No. Removal of the main P.C.B., tuner
10 P.C.B. and speaker terminal P.C.B.
Procedure
1 +10
1. Remove the 18 screws (@~ @).
0 98 9
q 7 f
—— ee {~- f.
=
/
b go
17)
4. Remove the tuner P.C.B. in the direction of
the arrow.
Speaker terminal P.C.B.
5. Remove the 1 screw (® ).
6.
Remove
the
speaker
terminal
P.C.B.
in
the
direction of the arrow,
How to check the main P.C.B. 5. Remove the bottom chassis.
6. Reinstall the power transformer to the rear chassis.
1. Remove the 11 screws (Q@~@, O~®) 7. Reinstall the front panel to the main P.C.B.
in above figure.
2. Remove the volume knob and nut.
3. Remove the front panel.
4. Remove the 7 screws (@) ~ @).
Front panel
Screws

SA-R177
Ref. No.
anes | Removal of the AC INLET P.C.B. Removal of the power IC
Procedure Procedure
110 11 @ Release the 2 claws. 1210 +12
1. Unsolder the power IC.
2. Remove the 2 screws (@, @).
AC INLET P.C.B.
Unsolder the power IC
Note: When mounting the power IC, apply silicon
terminal compound (SZZOL15) to the rear
of the power IC.

SA-R177
M@ PROTECTION CIRCUITRY
The protection circuitry may have operated if either
of the following conditions is noticed:
e No sound is heard when the power is turned on.
e Sound stops during a performance.
The function of this circuitry is to prevent circuitry
damage if, for example, the positive and negative
speaker connection wires are “shorted”, or if
speaker systems with an impedance less than the
indicated rated impedance of the amplifier are used.
Mi BEFORE REPAIR
If this occurs, follow the procedure outlines below:
1. Turn off the power.
2. Determine the cause of the problem and correct
it.
3. Turn on the power once again after one minute.
Note:
When the protection circuitry functions, the unit will
not operate unless the power is first turned off and
then on again.
(1) Turn off the power supply. Using a 10Q, 5W resistor connect both ends of power supply capacitors (C701,
C702, 4700uF) in order to discharge the voitage.
(2) Before turning the power supply on, after completion of repair, slowly apply the primary voltage by using a
power supply voltage controller to make sure that the consumed current at 50Hz/60Hz in NO SIGNAL mode
should be shown below with respect to supply voltage 110V/127 V/220V/240V.
Power supply voltage AC110V AC127V AC220V AC240V
Consumed current 50/60Hz | 170~470mA_ | 150 ~450mA 60 ~260mA 50 ~ 250mA
Mi
MEASUREMENTS
AND
ADJUSTMENTS
Note:
For
Z202
(AM-IFT),
and
Z201(AM
ANT
and
OSC
coil),
they
are
supplied
as
adjusted
parts.
So,
do
not
turn
the
cores
of
the
parts.
It is not necessary to adjust the AM circuit.
e ADJUSTMENT POINTS
FM MONO
DISTORTION
coil
— 10 —
VR301
FM MPX VCO Adj.

e FM ADJUSTMENT
Control positions and equipment used
e FM signal generator (FM-SG).
© Distortion analyser
«Oscilloscope
¢ DC electronic voltmeter (EVM)
FM MONO DISTORTION ADJUSTMENT
1. Test equipment connection is shown in figure.
2. Set the unit to “FM” position.
3. Set the radio frequency display and signal generator
to 100.10MHz.
. Adjust T201 core so that voltage measured in signal
mode is OmV (0+20mV) in 300mV range.
. Adjust T202 so that the distortion factor of Lch is
minimized.
. Repeat steps 4 and 5 a few times.
. Make sure that the distortion factors of Lch and Rch
are nearly the same with each other to minimum.
Note:
The adjusting screwdriver used should be made of
resin.
FM MPX VCO ADJUSTMENT
1. Test equipment connection is shown in figure.
2. Set the unit to “FM auto” position.
3. Place the radio frequency display and signal
generator setting to 100.10 MHz.
. Adjust VR301 for 19.00+0.03kHz on frequency
counter reading.
%* USING ALTERNATE SYSTEM
1. Apply stereo signal from generator or receive the
stereo broadcast.
2. Adjust VR301 until stereo indicator lights up.
Cement arm of VR301 as shown in figure.
¢ Frequency counter
¢Choke coil (100}H)
e Resistor (100kQ)
SA-R177
FM SIGNAL GENERATOR CONDITION
Modulation
Modulation frequency.
Output level
onooee
(non-modulation)
66dB
FREQUENCY
FM ANTENNA COUNTEA
TERMINAL
: Stereo ON position
® - ©) - ©: Stereo OFF position
©-@©
{indicator lighting)
©: Adjust point of pilot circuit
Teo e re TEP Lee ARON ee RET ee

SA-R177
TERMINAL FUNCTION OF IC
e 10901 (LC6554H4097): Microcomputer
Function Function
Division
Segment signal output Level shift control output
Key return signal input
Not used, connected to GND
Key return signal input
Power supply terminal
Power ON/OFF det. terminal
(Not used, open)
Volume motor drive output
STEREO Stereo signal det. terminal
S Received signal det. terminal
D I
Not used, connected to GND
DP 1/0 Cassette deck control terminal 42
RELAY
Oo
Relay
control
output
43
Power
supply
terminal
(negative voltage)
DK | Cassette deck control terminal
START —- Not used, connected to GND
STOP — Not used, open
FM AUTO/MONO select signal
MONO oO output
Segment signal output
Pay Muting control output for tuner
circuit
Muting control output for amplifier
circuit
Muting control output for amplifier
o circuit
-
Power
supply
terminal
_ Not used, connected to GND (positive voltage)
fe)
— Ground terminal
Oscillator terminal
ie)
RES | Reset signal input
Digit signal and key scan signal
PFO/DA
[@)
Serial
data
output
output
PFI/CK Clock signa! terminal for serial data
PF2/CE Chip enable terminal
PF3/INT Remote control input
Not used, connected to GND
~12—-

@ BLOCK DIAGRAM
FM MONO DISTORTION adj
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tuner matrix
a-i6-=

@ SCHEMATIC DIAGRAM
(Parts list on pages 35 ~ 40)
(This schematic diagram may be modified at any time with the
development of new technology.)
Note 1:
e $601-1, S601-2 : Speaker selectors.
$601-1: A S601-2: B
S701 : Power “on/off” switch.
@$702 : Voltage selector switch. (For (G) area.)
$901 ~ $910 : Preset-tuning (1-0) switches.
$901 : CH1, S902 : CH2, S903 : CH3,
$904 : CH4, S905 : CH5, S906 : CHG,
$907 : CH7, S908 : CH8, S909 : CH9,
$910 : CHO
es911 : Music-scan/group-search switch.
@$912 : FM mode selector.
@ $913, $914 : Band selectors. "
$913: FM, S914:AM
@ $915, $916 : Tuning switches.
$915: W(DOWN), S916: A (UP)
S917 : Memory switch.
S918 : Loudness switch.
eS919 ~ $926 : Group registration switches.
$919 : start, S920: rock, $921 : jazz
$922 : classic, S923 : easy, S924 : news
$925 : other, S926: end
e@$927~S929, _ : Input selector switches.
$931 $927 : phono, $928 : tuner, S929 : oo,|
ee :VCR1
© S930 : Tape-monitor/VCR 2 switch.
® Signal line
coon : FM OSC <=>: FM signal
==B8) - AM OSC em AM signal
cz : Phono signal : AF signal (Lch)
—(__}- : Positive voltage lines
--{__}-- : Negative voltage lines
© Important safety notice:
Components identified by A.” mark have special characteristics
important for safety. When replacing any of these components,
use only manufacturer's specified parts. Indicated boltage values
are standard values for the unit measured by the DC electronic
circuit tester (high-impedance) with the chassis taken as standard.
Therefore, there may exist some errors in the voltage values,
depending on internal impedance of the DC circuit tester.
@ All voltage values shown in circuitry are DC voltage in FM signal
(Stereo signal) reception mode.
* Figures in ( ) Stand for DC-voltage in AM signal reception mode.
* Caution!
IC and LSI are sensitive to static electricity.
Secondary trouble can be prevented by taking care during
repair.
* Cover the parts boxes made of plastics with alminum foil.
* Ground the soldering iron.
* Put a conductive mat on the work table.
* Do not touch the legs of IC or LSI with the fingers directly.
Note2:
¢ Use of ceramic filters in pairs
The ceramic filters (CF 201, CF202) for FM-IF circuit are
available in three ranks. For this circuit, be sure to use the
ceramics of the same rank in a pair.
At repairing and replacement, pay close attention to the
diodes (D914, D915) for use as different diodes must be used
depending on each rank of the ceramic filters.
Color marking
(Blue, Red or
Note: © mark: Diode is used.
x mark: Diode is not used.
a47
SA-R177 SA-R177
1 2 3 4
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B48
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Data code Custom code Data code
pulse code
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foeckecmute | ore0r | ooornn | av [umes | ovo01__| 010000
«[oecKniay« | o1oon | ooroor [ae [coe | _o11o0 | _ovsou0 |
Pveunew | _or0o1 | [ex [coe | 01100 | or0001
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[eps | oto [ae —[oecx pause] —oraor [0110 |
Trogariconinue | 01100 [stare | — oreo] oro
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17 18
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19
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— 28 —
297