Sony ICF-CD523 Service Manual ▷ View online
13
ICF-CD523
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
T1
450 kHz
( ): AEP model
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L4
530 kHz
(531 kHz)
2.65
±
0.1 V
Confirmation
1,710 kHz
8.8
±
0.5 V
(1,602 kHz)
(8.5
±
0.5 V)
( ): AEP model
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3
580 kHz (621 kHz)
CT2
1,490 kHz (1,404 kHz)
FM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L2
87.5 MHz
2.6
±
0.1 V
Confirmation
108 MHz
8.0
±
0.5 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
87.5 MHz
CT1
108 MHz
Adjustment Location: MAIN board (See page 15)
FM VCO ADJUSTMENT
Setting:
Procedure:
1. Connect the frequency counter to TP(STVCO), TP(TU - +B)
on the MAIN board, as shown the figure below.
2. Tune the set to 98 MHz.
3. Adjust RV1 on the MAIN board for 76 kHz reading on the
3. Adjust RV1 on the MAIN board for 76 kHz reading on the
frequency counter.
Specified Value: 75.95 to 76.05 kHz
Adjustment Location: MAIN board (See page 15)
SECTION 5
ELECTRICAL ADJUSTMENTS
TUNER SECTION
0 dB=1
µ
V
[AM]
Setting:
Function : RADIO
Band
Function : RADIO
Band
: AM
[FM]
Setting:
Function : RADIO
Band
Function : RADIO
Band
: FM
• Attention
BP1 Desoldering
(Must be short after measurement)
(Must be short after measurement)
• Repeat the procedures in each adjustment several times, and
tracking adjustments should be finally done by the trimmer
capacitors.
capacitors.
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
+
–
–
level meter
set
4
Ω
MAIN board
speaker terminal (CN301)
speaker terminal (CN301)
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
deviation by 400 Hz
signal
Output level: as low as possible
+
–
–
level meter
set
4
Ω
0.01
µ
F
MAIN board
TP (FMIN)
TP (FMIN)
MAIN board
speaker terminal (CN301)
speaker terminal (CN301)
TP (FEG)
digital voltmeter
100 k
Ω
MAIN board
TP (VT)
FM RF SSG
Carrier frequency: 98 MHz
Modulation: 400 Hz, 30% FM modulation
Output level: 0.1 V (100 dB)
Modulation: 400 Hz, 30% FM modulation
Output level: 0.1 V (100 dB)
MAIN board
TP (FMIN)
TP (FMIN)
0.01
µ
F
set
TP (FEG)
1
µ
F
TP (STVCO)
+
–
–
frequency counter
33 k
Ω
TP (TU - +B)
+
MAIN board
Ver. 1.1
14
ICF-CD523
CD SECTION
CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.
In case of operation check, confirm that focus bias.
FOCUS BIAS CHECK
Connection:
Procedure:
1. Connect the oscilloscope to TP513 (RF) and TP568 (GND)
on the MAIN board.
2. Insert the CD test disc (PATD-012). (Part No. 4-225-203-01)
3. Press the CD u button.
4. Confirm that the oscilloscope waveform is as shown in the
3. Press the CD u 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.
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)
Connecting Location: MAIN Board (See page 15)
MAIN board
TP513 (RF)
TP568 (GND)
+
–
–
oscilloscope
(AC range)
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns
TIME/DIV: 500 ns
1.2
±
0.3 Vp-p
When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.
for AC range and raise vertical sensitivity.
15
ICF-CD523
T1
AM IF Adjustment
L4
AM Frequency
Coverage Adjustment
L2
FM Frequency
Coverage Adjustment
RV1
FM VCO
Adjustment
FM Tracking Adjustment
L1
CT1
CT1
AM Tracking Adjustment
CT2
L3
– MAIN Board (Component Side) –
TP
(FEG)
TP
(FMIN)
TP
(VT)
TP
(TU-+B)
TP
(STVCO)
TP568
(GND)
(GND)
TP513
(RF)
– MAIN Board (Conductor Side) –
Adjustment and Connecting Location:
16
ICF-CD523
MEMO
Click on the first or last page to see other ICF-CD523 service manuals if exist.