DOWNLOAD Sony ICF-CD555TV Service Manual ↓ Size: 4.05 MB | Pages: 74 in PDF or view online for FREE

Model
ICF-CD555TV
Pages
74
Size
4.05 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
icf-cd555tv.pdf
Date
PREV: Sony ICF-C273 / ICF-C273L Service Manual

Sony ICF-CD555TV Service Manual ▷ View online

13
ICF-CD555TV
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
450 kHz
AM VCO VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L4
530 kHz
1.0 
± 0.1 V
Confirmation
1,710 kHz
5.3 
± 0.7 V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3
580 kHz
CT3
1,490 kHz
FM IF ADJUSTMENT
Adjust for a minimum reading on level meter
T2
10.7 MHz
FM VCO VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L2
87.5 MHz
1.3 
± 0.3 V
Confirmation
108 MHz
3.0 
± 0.2 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
87.5 MHz
CT1
108 MHz
Adjustment and Connecting Location:
TUNER board (See page 14)
TUNER  SECTION
0 dB=1 
µ
V
[AM]
Setting:
Function: RADIO
Band: AM
[FM]
Setting:
Function: RADIO
BAND button: FM
• Repeat the procedures in each adjustment several times, and the
tracking adjustments should be finally done by the trimmer ca-
pacitors.
AM RF signal 
generator
30% amplitude
modulation by
400 Hz signal
Output level: 
as low as possible
Put the lead-wire
antenna close to 
the set.
+
–
level meter
set
6 
Ω
AMP board
CN301 pin 
2
AMP board
CN301 pin 
1
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: 
as low as possible
+
–
level meter
AMP board
CN301 pin 
2
AMP board
CN301 pin 
1
set
6 
Ω
0.01 
µ
F
TUNER board
TP (GND)
TUNER board
TP (ANT)
digital voltmeter
TP (VT)
TP (GND)
100 k
Ω
TUNER board
SECTION  5
ELECTRICAL  ADJUSTMENTS
14
ICF-CD555TV
Adjustment and Connecting Location:
L4
AM VCO Voltage Adjustment
L2
FM VCO Voltage Adjustment
FM Tracking Adjustment
T1 AM IF Adjustment
T2 FM IF Adjustment
L1
CT1
AM Tracking Adjustment
L3
CT3
– TUNER BOARD (Component Side) –
– TUNER BOARD (Conductor Side) –
TP
(VT)
TP
(GND)
TP
(ANT)
15
ICF-CD555TV
CD SECTION
Perform all CD section check in the test mode.
FOCUS  BIAS  CHECK
Procedure:
1. Connect the oscilloscope to TP (RF) and TP (VREF) on the
CD board.
2. Set the CD TEST MODE. (Refer to CD TEST MODE (See
page 9))
3. Insert the test disc (YEDS-18). (Part No. 3-702-101-01) (CD)
4. Press the
7
key. (LPC ON)
5. 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.
6. Press the
7
key. (LPC OFF)
7. Perform confirmation in the same manner as step 5.
8. Press the
s
key.
9. Change the test disc (TCD-W082L). (Part No. J-2502-063-2)
(CD-RW)
10. Perform confirmation in the same manner as step 4 to 7.
•
 RF signal reference waveform (eye pattern)
Connecting Location:
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns
CD:
1.1 
±
 0.2 Vp-p (LPC ON)
1.1 
±
 0.3 Vp-p (LPC OFF)
CD-RW:
1.0 
±
 0.2 Vp-p (LPC ON)
0.9 
±
 0.3 Vp-p (LPC OFF)
When observing the eye pattern, set the oscilloscope 
for AC range and raise vertical sensitivity.
TP
(RF)
TP
(TE)
TP
(VREF)
IC701
IC702
– CD BOARD (Conductor Side) –
16
ICF-CD555TV
5-1-5. 3.9V  CHECK
Connection:
Checking Procedure:
1. Connect a digital voltmeter to the TP1411 on the TV board.
2. Check that the reading of digital voltmeter is 3.85 
± 0.2 V.
5-1-6. 7.5V  CHECK
Connection:
Checking Procedure:
1. Connect a digital voltmeter to the TP1907 on the TV board.
2. Check that the reading of digital voltmeter is 7.3 
± 0.2 V.
5-2.
PLL  ADJUSTMENT
Connection:
Adjusting Procedure:
1. Connect a digital voltmeter to the TP1651 on the TV board.
2. Adjust the RV1651 so that the reading of digital voltmeter is
2.2 
± 0.15 V.
5-3.
V  COM  ADJUSTMENT
Connection:
Adjusting Procedure:
Connect an oscilloscope to the TP1955 on the TV board.
5-3-1. VOLTAGE  SET  UP  ADJUSTMENT
Adjust the set so that the A   level of the waveform on the
oscilloscope is 6.6 
± 0.1 Vp-p. (Refer to the 5-7. video bus adjust-
ment (See page 17))
MONITOR  SECTION
5-1.
VOLTAGE  CHECK
5-1-1. VDD (3.3V)  CHECK
Connection:
Checking Procedure:
1. Connect a digital voltmeter to the TP1904 on the TV board.
2. Check that the reading of digital voltmeter is 3.3 
± 0.2 V.
5-1-2. VGH (17.0V)  CHECK
Connection:
Checking Procedure:
1. Connect a digital voltmeter to the TP1912 on the TV board.
2. Check that the reading of digital voltmeter is 17.5 
± 0.5 V.
5-1-3. VSS (–13.0V)  CHECK
Connection:
Checking Procedure:
1. Connect a digital voltmeter to the TP1911 on the TV board.
2. Check that the reading of digital voltmeter is –12.5 
± 0.5 V.
5-1-4. 13.5V  CHECK
Connection:
Checking Procedure:
1. Connect a digital voltmeter to the TP1401 on the TV board.
2. Check that the reading of digital voltmeter is 11.5 
± 0.5 V.
digital
voltmeter
TP1403 (GND)
TP1904
set
+
–
digital
voltmeter
TP1403 (GND)
TP1912
set
+
–
digital
voltmeter
TP1403 (GND)
TP1911
set
+
–
digital
voltmeter
TP1403 (GND)
TP1401
set
+
–
digital
voltmeter
TP1403 (GND)
TP1411
set
+
–
digital
voltmeter
TP1403 (GND)
TP1907
set
+
–
digital
voltmeter
TP1403 (GND)
TP1651
set
+
–
+
–
TP1403 (GND)
TP1955
set
osclloscope
A
Page of 74
Display

Click on the first or last page to see other ICF-CD555TV service manuals if exist.

RANDOM: