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Q Q
3 7 6 3 1 5 1 5 0
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
Note on Schematic Diagram:
• 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 Ω and
1
/
W or less unless otherwise
4
specified.
•
f
: internal component.
• 2 : nonflammable resistor.
• 5 : fusible resistor.
• C : panel designation.
Note: The components identified by mark 0 or dotted line
with mark 0 are critical for safety.
Replace only with part number specified.
• A : B+ Line.
• B : B– Line.
• H : adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
• Voltages are taken with a VOM (Input impedance 10 MΩ).
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
E
: PB (DECK A)
T E
L
1 3 9 4 2 2 9 6 5 1 3
d
: PB (DECK B)
G
: REC (DECK B)
J
: CD
c : digital out
w w w
.
http://www.xiaoyu163.com
SECTION 7
DIAGRAMS
Note on Printed Wiring Boards:
• X : parts extracted from the component side.
•
: Pattern from the side which enables seeing.
• Indication of transistor.
C
These are omitted.
Q
B
E
Q
B
C E
These are omitted.
x
a o
y
i
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8
7-1. CIRCUIT BOARDS LOCATION
CD SWITCH Board
PANEL Board
LEAF SW Board
Q
Q
3
7
6
3
1
HEAD (A) Board
• WAVEFORMS
– BD BOARD –
1
IC101 yj
CD PLAY MODE
16.9344MHz
2
IC101 ta
CD PLAY MODE
400nsec/div
– PANEL BOARD –
1
IC601 oa
u 1 6 3
STOP MODE
.
12.5MHz
21
21
2
4
9
9
8
MOTOR Board
DRIVER Board
SENSOR Board
TRANS Board
5
1
5
0
8
9
2
4
HEAD (B) Board
– MAIN BOARD –
3
1
IC401 qa
IC101 ra
STOP MODE
CD PLAY MODE
approx 200mVp-p
6.4Vp-p
32.768kHz
2
4
IC401 qd
IC101 el
STOP MODE
CD PLAY MODE
approx 170mVp-p
16MHz
1.2Vp-p
m
c o
4.8Vp-p
HCD-DX90
2
9
9
BD Board
MAIN Board
POWER AMP Board
9
8
2
9
9
3
T301 4
TAPE B REC MODE
80.7kHz
120Vp-p
3.0Vp-p
3.4Vp-p
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