Sony ICF-CD837, Руководство по обслуживанию, Страница: 19 / 46

ICF-CD837
19 19
ICF-CD837
5-3. CIRCUIT BOARDS LOCATION • NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
for 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.
• 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.
• Voltage and waveforms are dc with respect to ground
under no-signal conditions.
– CD Board –
no mark : CD PLAY
– MAIN Board –
no mark : FM
(
) : AM
< > : CD
– Other Boards –
no mark : FM
∗
: 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.
• Waveforms are taken with a oscilloscope.
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
• Abbreviation
CND : Canadian model.
MX
: Mexican model.
AUS : Australian model.
for printed wiring boards:
• 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 layer’s patterns are not indicated.)
C
B
These are omitted.
E
Q
B
These are omitted.
C
Q
Q
E
B C E
Note: The components identified by mark 0 or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
Caution:
Pattern face side:
Parts on the pattern face side seen from
(Conductor Side) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Component Side) the parts face are indicated.
• Waveforms
— CD BOARD — (Mode: PLAY)
CD board
KEY board
BRIGHTNESS board
POWER board
INDICATOR board
DRIVE board
MAIN board
0.85
±
0.2Vp-p
Approx. 100mVp-p
1
IC701
4
(RF)
500mV/div, 0.5
µ
sec/div
1.6V
Approx. 100mVp-p
1.6V
16.93MHz
3.0Vp-p
2
IC701
qd
(FE)
100mV/div, 5msec/div
3
IC701
qg
(TE)
100mV/div, 5msec/div
4
IC701
rk
(XOUT)
1V/div, 0.05
µ
sec/div
3.3Vp-p
3.3Vp-p
4.19MHz
32.768kHz
1
IC401
ua
(XT2)
1V/div, 10
µ
sec/div
2
IC401
ug
(X2)
1V/div, 0.1
µ
sec/div
— MAIN BOARD —