Read Sony HS-RM436 / HS-RM439 Service Manual online
8
HS-RM436/RM439
TUNER SECTION
AM section
BAND : AM
FM section
BAND :FM
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
IFT1
1,400kHz
<1,395kHz>
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust parts
Frequency display
Reading on digtal
voltmeter
L4
530kHz <531kHz>
Adjustment value : 1.2V
Standard value : 1.1–1.3V
Standard value : 1.1–1.3V
Confirmation 1,710kHz <1,602kHz> Standard value : 9V or less
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
620kHz
<621kHz>
CT1
1,400kHz
<1,395kHz>
FM FREQUENCY COVERAGE ADJUSTMENT
Frequency display Reading on digtal voltmeter
L3
108MHz
Adjustment value : 9.0V
Standard value : 8.7–9.3V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
98MHz
Confirmation
108MHz
Adjustment Location : Main board
0 dB = 1
µV
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
< >: 9kHz step
AM RF signal
generator
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
signal.
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
set
32
Ω
phones jack (J301)
level meter
Frequency Coverage Adjustment
Setting :
Setting :
C34
CF1
CF2
X1
BPF1
IN
E
OUT
L2
R24
R23
C37
C38
L5
R6
R4
10
C14
C10
C8
C9
C33
D2
HOLD
ON
OFF
t
.
FM RF signal
generator
generator
33.75kHz frequency deviation
by 1kHz signal.
Output level :
as low as possible
by 1kHz signal.
Output level :
as low as possible
BPF1 IN
0.01
µ
F
[MAIN BOARD]
(Side B)
(Side B)
L3
L4
R15
R7
R13
R5
R11
R19
R12
R8
C17
C7
C858
C857
C16
C18
C5
C3
C12
C13
E
S802
TP
(VT)
+
/UP
PRESET/TUNE
t
TP (VT)
[MAIN BOARD]
(Side B)
(Side B)
digital voltmeter
(DC range)
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