DOWNLOAD Sony D-F21 / D-F22ST / ICD-BP220 Service Manual ↓ Size: 4.33 MB | Pages: 32 in PDF or view online for FREE

Model
D-F21 D-F22ST ICD-BP220
Pages
32
Size
4.33 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
d-f21-d-f22st-icd-bp220.pdf
Date
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5
D-F21/F22ST
Note : Follow the disassembly procedure in the numerical order given.
3-2. LID ASSY, UPPER
SECTION 3
DISASSEMBLY
3-1. “LID, BATTERY CASE”, CABINET (FRONT) ASSY
1
 B 2x10
3
 B 2x10
4
 claws
0
 cabinet (upper) assy
5
 claws
6
 claws
7
 claws
8
9
2
 lid, battery case
boss
1
 claws
2
 lid assy, upper
cabinet  (front) assy
6
D-F21/F22ST
3-3. MAIN BOARD, MD ASSY
3-4. OPTICAL PICK-UP, MOTOR
1
 CN501
4
 MD assy
7
 MAIN board
cabinet (lower) sub assy
knob (HOLD)
terminal (+.–), battery (BT400)
terminal (–), battery (BT402)
S803
2
 CN502
5
 S812
6
 S813
3
 CN503
1
 B 1.7x5
3
 B 1.7x5
7
 P 1.4x3.5
9
 B 1.4x2.3
0
 rack
8
 retainer, shaft
qa
 screw (feed) assy
qd
 shaft, standard
qs
 pick-up block, optical
4
 cover, gear
2
 motor assy, turntable (M502)
5
 motor assy, sled (M501)
chassis
6
 gear (B)
Note: When installing, fit the knob (HOLD) and S803.
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
8
D-F21/F22ST
TP629
RF
– MAIN BOARD (SIDE B) –
Adjustment Location:
  CD SECTION
CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.
FOCUS BIAS CHECK
1. Connect the oscilloscope between TP629 (RF) and GND on
main board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the  N X  button.
4. Confirm that the oscilloscope waveform is as shown in the
figure below. (eye pattern)
A good eye pattern means that the diamond shape (     ) in the
center of the waveform can be clearly distinguished.
• RF signal reference waveform (eye pattern)
Test Point:
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
CN501
IC61
TP81
VT
TP3
RF-IN
– MAIN BOARD (SIDE A) –
CT3   L4
L3
L1
CT1
L2
FM TRACKING ADJ
AM IF ADJ
T1
AM TRACKING
 ADJ
RF level :
0.45 
±
 0.1 Vp-p
VOLT/DIV : 20 mV (10 : 1 probe in use)
TIME/DIV : 500 nS
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