Read Sony HS-JM400 Service Manual online
9
HS-JM400
[AM]
BAND : AM
BAND : AM
[FM]
BAND : FM
BAND : FM
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
505 kHz
CT1-4
1,690 kHz
TUNER SECTION
0.01
µ
F
FM RF signal
generator
generator
to ANT (FM IN)
75kHz frequency deviation by 1kHz signal.
Output level : as low as possible
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
30% amplitude modulation by 400 Hz
signal.
Output level : as low as possible
signal.
Output level : as low as possible
AM RF signal
generator
generator
set
+
–
level meter
2
jack (J301)
16
Ω
0dB=1µV
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455 kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
86.0 MHz
CT1-3
109.5 MHz
• Repeat the procedures in each adjustment several times.
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
620 kHz
CT1-1
1,400 kHz
[MAIN BOARD] - SIDE B -
Adjustment Parts Location :
[MAIN BOARD] - SIDE A -
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
86.0 MHz
CT1-2
109.5 MHz
CT1-3
CT1-4
CT1-2
CT1-1
RV601
L4
L3
L2
T1
L1
CT1-3 : FM frequency
coverage adjustment
CT1-4 : AM frequency
coverage adjustment
CT1-2 : FM tracking
adjustment
CT1-1 : AM tracking
adjustment
RV601 : Tape speed adjustment
L4 : AM frequency
coverage adjustment
L3 : FM frequency
coverage adjustment
L1 : AM tracking
adjustment
L2 : FM tracking
adjustment
T1 : AM IF
adjustment
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