D-F21, D-F22ST, ICD-BP220 - Sony Audio Service Manual (repair manual). Page 7

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7
D-F21/F22ST
digital
voltmeter
100 k
Ω
TP81 (VT)
i
 jack (J302)
set
16 
Ω
level meter
(range: 0.5–5 V ac)
Put the lead-wire
antenna close to
the set.
AM RF signal
generator
TP3 (RF-IN)
FM RF signal
generator
0.01 
µ
F
set
  TUNER SECTION     0 dB = 1 µV
• FM Section

Setting:
RADIO ON•BAND/MEMORY button : FM
STEP switch
: 10k
75 kHz frequency
deviation by 1 kHz signal
output level : as low as possible
• AM Section

Setting:
RADIO ON•BAND/MEMORY button : AM
STEP switch
: 10k
30% amplitude
modulation by
400 Hz signal
• Connecting Level Meter (FM and AM)
• Connecting Digital Voltmeter (FM and AM)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
• For FM adjustment, fix the FM RF coil (L1) as shown next page
and then perform tracking adjustment at L2 and CT1.
Lastly check the voltage value.
• For AM adjustment, fix the ferrite-rod antenna (L3) as shown
next page and then perform tracking adjustment at L4 and CT3.
Lastly check the voltage value.

Adjustment Location: See page 8.
SECTION 4
ELECTRICAL ADJUSTMENTS
FM FREQUENCY COVERAGE
CHECK
Frequency Display
87.5 MHz
108 MHz
Reading on Digital voltmeter
2.5 ± 1.5 V
7.0 ± 4.0 V
Adjustment Part
<confirmation> <confirmation>
FM TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
CT1
87.5 MHz
108 MHz
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
450 kHz
AM FREQUENCY COVERAGE
CHECK
Frequency Display
530 kHz
1,710 kHz
Reading on Digital voltmeter
1.0 ± 0.5 V
5.2 ± 0.7 V
Adjustment Part
<confirmation> <confirmation>
AM TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
CT3
620 kHz
1,400 kHz

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