DOWNLOAD Sony ICF-CD830 / ICF-CD830L Service Manual ↓ Size: 4.9 MB | Pages: 53 in PDF or view online for FREE

Model
ICF-CD830 ICF-CD830L
Pages
53
Size
4.9 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
icf-cd830-icf-cd830l.pdf
Date

Sony ICF-CD830 / ICF-CD830L Service Manual ▷ View online

7
ICF-CD830/CD830L
SECTION  3
TEST MODE
3-1. LCD Test Mode
• The LCD test mode is initiated by turning off the main power once then
back on or by resetting the machine while IC401 pin-60 terminal is
connected to GND, or while depressing the  D.S.T. ,  ALARM MODE  and
RADIO  keys simultaneously.
• The LCD test mode operations are listed in the following table.
• When the machine enters the LCD test mode, the version number of the
system control IC is displayed on the LCD.
• Pressing the  SNOOZE/DATE/SLEEP OFF  key turns on all segments of
LCD and LEDs.
• Pressing any key turns off the corresponding segment of the LCD.
Correspondence between the keys and segments of LCD are as follows.
KEY
D.S.T.
ALARM MODE
ALARM SET CD
ALARM SET BUZZER
ALARM SET RADIO
CLOCK
TIME SET –
TIME SET +
SEGMENT
s
ALARM  CD RADIO BUZZER
ALARM-CD LED
ALARM-BUZZER LED
ALARM-RADIO LED
AM, PM,:
1a, 1b, 1c, 1d, 1e, 1f, 1g,
2a, 2b, 2c, 2d, 2e, 2f, 2g
3a, 3b, 3c, 3d, 3e, 3f, 3g,
4a, 4b, 4c, 4d, 4e, 4f, 4g
KEY
CD PLAY MODE
CD
RADIO
OFF
SNOOZE/DATE/
SLEEP OFF
SEGMENT
REP, 1, ALL, SHUFFLE,
   ,    ,    ,
CD, H,    TRACK
RADIO, SLEEP
5a, 5b, 5c, 5d, 5e, 5f, 5g,
6a, 6b, 6c, 6d, 6e, 6f, 6g
• After all segments of LCD and LEDs turn off, pressing the  SNOOZE/DATE/SLEEP OFF  key ends the LCD test mode and resets the
machine.
3-2. CD Test Mode
3-2-1. CD TEST-1 (AUTO)
• The CD TEST-1 (AUTO) mode is initiated by turning off the main power once then back on or by resetting the machine while IC401 pin-
59 terminal (RADIO LED) is connected to GND, or while depressing the  D.S.T. ,  ALARM MODE  and  CD  keys simultaneously.
• When the machine enters CD TEST-1 (AUTO) mode, it repeats the focus search until the focus becomes OK.
• After the focus becomes OK and the focus is automatically adjusted, rough servo is locked in and the adjustment value is displayed.
• The sled can be moved to the innermost track by pressing the  .  button. The sled can be moved to the outermost track by pressing
the  >  button.
• When the  RADIO  button is pressed, the machine enters the CLVA (servo ON) and the mute is turned OFF if data is read successfully.
When the following button is pressed, the corresponding operations are performed.
a)   ALARM SET CD
Setting the 1 track jump
b)   ALARM SET RADIO
Setting the 10 track jump
c)   ALARM SET BUZZER
Setting the 100 track jump
Afterwards the desired track jump can be set by pressing the  >  or  .  button.
d)   ALARM MODE
TRACKING GAIN-UP
e)   RADIO
Rough servo
•  D.S.T.  restarts CD TEST-1 (AUTO) mode from the focus automatic adjustment
• When the  CD  button is pressed then, the track jumps to the second session and the machine exits the CD TEST-1 (AUTO) mode.
3-2-2. CD TEST-2 (MANUAL)
• The CD TEST-2 (MANUAL) mode is initiated by turning off the main power once then back on or by resetting the machine while IC401
pin-58 terminal (CD LED) is connected to GND.
• When the machine enters CD TEST-2 (MANUAL) mode, it repeats the focus search until the focus becomes OK.
• After the focus becomes OK, the machine enters the rough servo.
• The sled can be moved to the innermost track by pressing the  .  button. The sled can be moved to the outermost track by pressing the
>  button.
• When the  RADIO  button is pressed, the machine enters the CLVA (servo ON) and the mute is turned OFF if data is read successfully.
When the  RADIO  button is pressed again, the machine enters the rough servo.
• When the  CD  button is pressed then, the track jumps to the second session and the machine exits the CD TEST-2 (MANUAL) mode.
(LCD segment)
F-E BALANCE ADJUSTMENT
TRACKING GAIN ADJUSTMENT
FOCUS BIAS ADJUSTMENT
AM
CD
SHUFFLE
TRACK
a
1
2
3
4
5
6
f
g
b
c
e
d
8
ICF-CD830/CD830L
CD TEST-1
FOCUS
OK
Auto adjustment
Rough servo
CD button
±
 button
RADIO
button
Servo ON
Sled movement
TEST MODE END
The second music
played back.
CD button
±
 button
RADIO
button
jump has
been set?
Executes the 
setting of jump.
Sets the respective
setup values.
TRACKING
GAIN UP
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
N
N
ALARM SET
BUZZER
ALARM SET
RADIO
ALARM SET
CD
ALARM
MODE
D.S.T.
CD TEST-2
FOCUS
OK
Rough servo
±
 button
±
 button
RADIO
button
CD
button
CD
button
Servo ON
Sled movement
TEST MODE END
The second music
played back.
Y
Y
Y
N
Y
Y
Y
Y : YES
N : NO
9
ICF-CD830/CD830L
SECTION  4
ELECTRICAL  ADJUSTMENTS
FM VCO Adjustment
Procedure:
FM RF signal
generator
Carrier frequency: 98 MHz
Modulation: no modulation
Output level: 0.1 V (100 dB)
0.01 
µ
F
FM lead wire antenna terminal
Connection:
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
455 kHz
AM FREQUENCY COVERAGE ADJUSTMENT (CD830)
Adjust for a maximum reading on level meter
L4
515 kHz (516.5 kHz)
CT4
1,750 kHz (1,631.5 kHz)
AM TRACKING ADJUSTMENT (CD830)
Adjust for a maximum reading on level meter
L1
600 kHz
CT1
1,400 kHz
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L3
86.5 MHz (87.35 MHz)
CT3
109.5 MHz (108.25 MHz)
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L2
86.5 MHz (87.35 MHz)
CT2
109.5 MHz (108.25 MHz)
PRECAUTION
• Adjustment should be performed in the order given.
[FM]
Setting:
Function switch :  RADIO
BAND switch
:  FM
[AM (MW/LW) ]
Setting:
Function switch :  RADIO
BAND switch
:  AM (MW/LW)
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.
FM RF signal
generator
75 kHz frequency deviation 
by 1 kHz signal.
Output level: as low as possible
0.01 
µ
F
FM lead wire antenna terminal
TUNER  SECTION
0 dB=1 µV
Frequency counter
75,950 – 76,050 Hz
IC1 Pin 
4
+
frequency counter
33 k 
MAIN Board
IC1 Pin 
7
LW FREQUENCY COVERAGE ADJUSTMENT (CD830L)
Adjust for a maximum reading on level meter
CT6
145 kHz
LW TRACKING ADJUSTMENT (CD830L)
Adjust for a maximum reading on level meter
L1-2
160 kHz
CT5
240 kHz
1. Connect the frequency counter to 4 and 7 pins of IC1 as shown
the figure right.
2. Tune the set to 98 MHz.
3. Adjust RV1 for 76 kHz reading on frequency counter.
Specification Value:
MW FREQUENCY COVERAGE ADJUSTMENT (CD830L)
Adjust for a maximum reading on level meter
L4
515 kHz
CT4
1,750 kHz
MW TRACKING ADJUSTMENT (CD830L)
Adjust for a maximum reading on level meter
L1-1
600 kHz
CT1
1,400 kHz
level meter
set
SPEAKER OUT
+
(        ) : AEP Model
Adjustment Location:
[MAIN BOARD] (Component Side)
L3
T1
AM IF
Adjustment
CT3
CT2
L2
FM Traking
Adjustment
L3
FM Frequency 
Coverage
Adjustment
L4
CT4  
AM Frequency 
Coverage Adjustment
MW Frequency 
Coverage Adjustment
CT6  
LW Frequency 
Coverage
Adjustment
L1, L1-1 
AM Tracking Adjustment
MW Tracking Adjustment
CT5
LW Traking Adjustment
L1-2
LW Traking Adjustment
CT1
AM Tracking Adjustment
MW Tracking Adjustment
10
ICF-CD830/CD830L
SECTION  5
DIAGRAMS
Note on Printed Wiring Board:
• X
: parts extracted from the component side.
: Pattern from the side which enables seeing.
Note on Schematic Diagrams:
• All capacitors are in µF unless otherwise noted.  pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in 
 and 
1
/
4
 
W or less unless otherwise
specified.
¢
: internal component.
2
: nonflammable resistor.
C
: panel designation.
H
: adjustment for repair.
A
: B+ Line.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(         ) : AM (MW/LW)
<
> : CD
• Voltages are taken with a VOM (Input impedance 10 M
).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
F
: FM
f
: AM (MW/LW)
J
: CD
• Abbreviation
AUS
: Australian model
CND : Canadian model
IT
: Italian model
SP
: Singapore model
Note:
The components identi-
fied by mark 
!
 or dotted
line with mark 
!
 are criti-
cal for safety.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque 
!
 sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce por tant le numéro
spécifié.
5-1.  CIRCUIT BOARDS LOCATION
• Waveforms
0.2 V/DIV, 500 ns/DIV
1.0 V/DIV, 20 
m
s/DIV
2.0 V/DIV, 40 ns/DIV
1
 
IC401 
ud
 (XT1)
2
 
IC501 
ed
 (RF0)
       (PLAY MODE) 
3
 
IC551 
ua
 (XTA0) 
3.4 Vp-p
31 ms
0.9 – 1.3 Vp-p
5.6 Vp-p
59 ns
MAIN board
LED board
TRANSFORMER board
MOTOR (6P) board
KEY board
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