Technics SA-5270 Service Manual

MAIN AMPLIFIER EQUALIZER AMPLIFIER I.C.
POWER AM BAR ANTENNA
SOURCE
FUSES
FM
RF
CIRCUIT
VARIABLE CAPACITORS
POWER
TRANSFORMER
FM
IF
AMPLIFIER
&
AM CONVERTER IC.
POWER SUPPLY FM IF AMPLIFIER &
DETECTOR I.C.
FM MPX
PLL DEMODULATOR 1.C.
SPEAKER
PROTECTION RELAY
m@ NOTE
The unit is provided with the speaker circuit protection fuses at the right and left channels respectively.
The fuse is to prevent the power transistor from destruction, should the speaker terminals be short-circuited.
Accordingly,
if
the
unit
fails
to
function
upon
completion
of
the
speaker
connections,
check
the
speaker
protection fuses first of all for possible blowing.
@ ALIGNMENT POINTS
SPEAKERS FMOSC
ae MO
L Lk RR Trimmer
BOO®
TP101----FM IF CHECK Wy
POINT \
TPEQ® ~~ 150kHz, \HDkHz
VOLTMETER
{R522
p
aM
ANT
© el eal TP201--~AM DETECTOR
UTPU N \
TP604@ = {REE FM ANT NI)
(ss ira Trimmer TP.
25 mV 301----PLL OSCILLATOR
® é FM DET OUTPUT (19kHz) POINT
Trimmer
TPEN® ff Pa
@ VR301 AM 0S!
VOLTME
TER
2,
{RGLTp
PLL
OSC
6
AES
weinvnet
@| Adjustment © |
1P802@ = CREAT sD hss AM OSC
TP301® L202 |Coi1
l= AB
LEFT L| 6
C LETI@E @ © 8,8 1201 [AM IFT
1P201 vR101 [5M Muting
vR302 7202 7101 =~ ndustment
Separation AM IFT FM IFT \——— Mete:
Adjustment
(Discriminator)
VR102
‘Adjustment
Fig. 1 FM meter vol
(VR102) adjustment Foleo)
(Abb.
1
)
hole
adjustmin
t
hole
VOLTAGE VOLTAGE
TP603
TR614
2
TP603 re
Less than
© 25mV
OUTPUT
VOLTMETER TP604 AMMETER
Voltage
check
method
Current
check
method
Fig. 2 (Stromspannung-priifmethode) Fig. 3 (Stromstarke-Priifmethode)
(Abb. 2) Méthode de vérification Méthode de vérification
. de tension (Abb. 3) de courant
[4] SA-5270

Technics SA-5270 Specifications

General

Brand	Technics
Model	SA-5270
Category	Stereo Receiver
Language	English