Electrical Adjustments; Tuner Section - Sony ZS-M35 Service Manual

5-1. TUNER SECTION

• FM Section
Setting:
BAND button: FM
FM RF signal
generator
0.01 µF
75 kHz frequency
deviation by 1 kHz signal
output level : as low as possible
• AM Section
Setting:
BAND button: AM
AM RF signal
generator
30% amplitude
modulation by 400 Hz signal
output level : as low as possible
• Connecting Level Meter (FM and AM)
32 Ω
set
i jack (J301)
• Connecting Digital Voltmeter (FM and AM)
tuner board
TP (VT)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
SECTION 5

ELECTRICAL ADJUSTMENTS

0 dB = 1 µV
FM antenna
(JW1,2)
set
Put the lead-wire
antenna close to
the supplied
AM loop antenna.
level meter
(range: 0.5-5 V ac)
digital
voltmeter
FM FREQUENCY COVERAGE
Frequency Display
Reading on Digital voltmeter
Adjustment Part
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
87.5 MHz
AM FREQUENCY COVERAGE
Frequency Display
Reading on Digital voltmeter
Adjustment Part
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
620 kHz
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
Adjustment Location: TUNER board (See page 23.)
– 22 –
ADJUSTMENT
87.5 MHz 108 MHz
+ 0.4 V
1.3 3.0
– 0.2 V
<confirmation>
CT1
108 MHz
ADJUSTMENT
530 kHz 1,710 kHz
0.8 ± 0.2 V 5.5 ± 0.3 V
<confirmation>
CT2
1,400 kHz
T1
450 kHz
+ 0.3 V
– 0.5 V
L2
L4