DOWNLOAD Sony ST-SA50ES Service Manual ↓ Size: 1.89 MB | Pages: 24 in PDF or view online for FREE

Model
ST-SA50ES
Pages
24
Size
1.89 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
st-sa50es.pdf
Date
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— 9 —
Stereo Separation Adjustment
Setting:
IF BAND : NARROW(NARROW SEPARATION)
WIDE (WIDE SEPARATION)
Procedure:
1. Set  IF BAND  switch to the NARROW position.
L-CH Stereo separation : A – B
R-CH Stereo separation : C – D
The separations of both channels should be equal.
set
FM RF Stereo
signal generator
FM ANTENNA (75
Ω
)
LINE OUT
VTVM
Modulation : Stereo Standard signal
Output level : 6mV (76dB
µ
) (at 75 
Ω
 open)
FM stereo
Signal generator
Output channel
L-CH
R-CH
R-CH
L-CH
Level meter
connection
L-CH
L-CH
R-CH
R-CH
Level meter
reading (dB)
A
B
IF BAND WIDE :
Adjust RV301 for minimum
reading on VTVM
IF BAND NARROW :
Adjust RV302 for minimum
reading on VTVM
C
D
IF BAND WIDE :
Adjust RV301 for minimum
reading on VTVM
IF BAND NARROW :
Adjust RV302 for minimum
reading on VTVM
— 10 —
AM SECTION
Setting:
BAND : MW
AM Meter Level Adjustment
Setting:
Carrier frequency : 1,050kHz
Modulation
: 400Hz, 30% modulation
Procedure:
1. Set AM RF signal generator so that the AM antenna input level
becomes 74dBµ/m.
2. Adjust RV402 so that 1 to 10 indication bars light up on the
signal meter.
Adjustment Location :
AM RF  SSG
loop antenna
set
loop antenna
(Supplied accessories)
60 cm
AM antenna
terminal
30% amplitude
modulation by
400 Hz signal
Field strength dB (
µ
V/m) =SSG output level dB (
µ
V/m) –26 dB.
FE101
RV402
AM Meter Level
Adjustment
RV232
Narrow THD
Adjustment
RV251
Stereo Level
Adjustment
T252
FM Discriminator Adjustment
(Null and Mono Distortion Adjustment)
RV221
FM Meter Level
Adjustment
IFT1
Front end IFT/
Stereo Distortion
Rate Adjustment
RV231
Narrow Gain
Adjustment
IC221
IC251
IC401
TP251
RV301
wide
Separation
Adjustment
RV302
Narrow
Separation
Adjustment
IC301
T253
(Distortion)
(Null)
— 11 —
— 12 —
SECTION 5
DIAGRAMS
AC SW board
DISPLAY board
ENCODER board
TUNER board
5-1. CIRCUIT BOARD LOCATION
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted.  pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in 
Ω
 and 
1
/
4
 
W or less unless otherwise
specified.
•
¢
: internal component.
•
2
: nonflammable resistor.
•
C
: panel designation.
Note: The components identified by mark 
!
 or dotted line
with mark 
!
 are critical for safety.
Replace only with part number specified.
•
U
: B+ Line.
•
V
: B– Line.
•
H
: adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f
: AM
Note on Printed Wiring Boards:
• X
: parts extracted from the component side.
•
¢
: internal component.
• b
: Pattern of the rear side.
• Waveform
1
 IC 701 
!™
  XTAL
4.19MHz
4Vp-p
ST-SA50ES
1
2
A
B
C
D
E
F
3
4
5
6
7
8
9
10
11
12
13
14
— 13 —
— 14 —
5-2. PRINTED WIRING BOARD – DISPLAY SECTION –     
•  Refer to page 11 for Circuit Board Location.
16
ECP700
Ref. No.
Location
D701
E-13
D702
D-13
D703
D-11
D705
E-11
D707
E-12
IC701
D-8
IC702
E-10
Q701
E-11
• Semiconductor
Location
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