Sony ICF-CD815 Service Manual ▷ View online
13
ICF-CD815
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
455 kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
Frequency Display
L4
520 kHz
CT4
1,750 kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
600 kHz
CT1
1,400 kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
Frequency Display
L3
86.5 MHz
CT3
109.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L2
fmin
CT2
fmax
Adjustment and Connecting Location:
T1
AM IF Adjustment
– TUNER Board (Component Side) –
AM Tracking
Adjustment
L1
CT1
CT1
AM Frequency
Coverage Adjustment
CT4
L4
L4
FM Frequency
Coverage Adjustment
L3
CT3
FM Tracking
Adjustment
L2
CT2
– TUNER Board (Conductor Side) –
TP1
TP2
SECTION 5
ELECTRICAL ADJUSTMENTS
TUNER SECTION
0 dB=1
µ
V
[AM]
Setting:
Function: RADIO
Band: AM
Function: RADIO
Band: AM
[FM]
Setting:
Function: RADIO
Band: FM
Function: RADIO
Band: FM
• Repeat the procedures in each adjustment several times, and
the 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
8
Ω
MAIN board
speaker terminal (CN302)
speaker terminal (CN302)
FM RF signal
generator
75 kHz frequency
deviation by 1 kHz
signal
Output level: as low as possible
deviation by 1 kHz
signal
Output level: as low as possible
+
–
–
level meter
set
8
Ω
0.01
µ
F
TUNER board
TP1
TP1
MAIN board
speaker terminal (CN302)
speaker terminal (CN302)
TP2
14
ICF-CD815
– MAIN Board (Conductor Side) –
TP706
(RF)
TP702
(VREF)
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 a oscilloscope to TP706 (RF) and TP702 (VREF) on
the MAIN board.
2. Insert the CD test disc (PATD-012). (Part No. 4-225-203-01)
3. Press the
3. Press the
u
CD
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
thecenter of the waveform can be clearly distinguished.
RF Signal Reference Waveform (Eye Pattern)
Checking Location:
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns
TIME/DIV: 500 ns
1.1
±
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.
+
–
–
MAIN board
TP706 (RF)
TP702 (VREF)
oscilloscope
(AC range)
ICF-CD815
15
15
ICF-CD815
•
Note For Printed Wiring Boards and Schematic Diagrams
Note on Schematic Diagram:
•
All capacitors are in
µ
F unless otherwise noted. (p: pF)
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
•
All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
f
: internal component.
• C
: panel designation.
• A
: B+ Line.
• H
: adjustment for repair.
•
Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(
under no-signal (detuned) conditions.
no mark : FM
(
) : AM
[
] : CD PLAY
∗
: Impossible to measure
•
Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
•
Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
Voltage variations may be noted due to normal produc-
tion tolerances.
•
Circled numbers refer to waveforms.
•
Signal path.
F
: FM
f
: AM
J
: CD PLAY
L
: AUDIO IN
Note on Printed Wiring Board:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
• W
: indicates side identified with part number.
•
f
: internal component.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
•
Circuit Boards Location
SECTION 6
DIAGRAMS
MOTOR board
DETECTION board
TUNER board
MAIN board
ALARM (A) board
ALARM (B) board
JACK board
KEY board
TRANS board
Note: The components identified by mark
0
or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
ICF-CD815
16
16
ICF-CD815
6-1. PRINTED WIRING BOARD – TUNER Section –
C22
C9
C25
C10
C2
C18
C13
C11
C17
C12
C7
C19
C21
C24
C14
C15
C16
C8
R10
R6
R9
R5
R7
R3
R14
R2
R1
L7
C4
+
C6
+
JW1
T1
1
4
CF2
CF3
CF1
8
1
16
9
IC1
TUNER BOARD
1-868-650-
(12)
12
L3
L4
CV1-2
CV1-4
CV1-3
CV1-1
CT2
CT3
CT4
CT1
TUNING
CV1
MAIN
BOARD
CN301
A
TRANS
BOARD
B
L1
AM FERRITE-ROD
ANTENNA
L2
A
B
C
D
1
2
3
4
5
6
7
(SHIELD)
TP1
TP2
•
See page 15 for Circuit Boards Location.
:Uses unleaded solder.
(Page 20)
(Page 21)
Click on the first or last page to see other ICF-CD815 service manuals if exist.