HCD-BX7/DX7/DX7J
21
21
SECTION 7
DIAGRAMS
7-1. CIRCUIT BOARD LOCATION
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
/
4
W or less unless otherwise
specified.
•
f
: internal component.
•
C
: panel designation.
Note on Printed Wiring Boards:
•
X
: parts extracted from the component side.
•
b
: Pattern from the side which enables seeing.
• Indication of transistor.
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 portant le numéro
spécifié.
•
U
: B+ Line.
•
V
: 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 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
E
: PB (DECK A)
d
: PB (DECK B)
G
: REC (DECK B)
J
: CD
c
: digital out
• Abbreviation
CND : Canadian model
AUS
: Australian model
G
: German model
EA
: Saudi Arabia model
MY
: Malaysia model
SP
: Singapore model
TH
: Thai model
KR
: Korea model
MX
: Mexican model
AR
: Argentina model
E2
: Central and South AMERICA
E3
: Middle and Near East
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
B
These are omitted.
C
E
Q
PANEL Board
LEAF SW Board
HEAD (A) Board
HEAD (B) Board
TRANS Board
CD SWITCH Board
SUB-TRANS Board
BD Board
DRIVER Board
MOTOR Board
SENSOR Board
MAIN Board
POWER AMP Board
• WAVEFORMS
C
B
These are omitted.
E
Q
1
IC101
yj
CD PLAY MODE
6.4Vp-p
16.9344MHz
1.2Vp-p
2
IC101
ta
CD PLAY MODE
3
IC101
ra
CD PLAY MODE
4
IC101
el
CD PLAY MODE
400nsec/div
approx 200mVp-p
approx 170mVp-p
1
IC401
qa
STOP MODE
3.0Vp-p
32.768kHz
3.4Vp-p
2
IC401
qd
STOP MODE
3
T301
4
TAPE B REC MODE
16MHz
120Vp-p
80.7kHz
1
IC601
oa
STOP MODE
4.8Vp-p
12.5MHz
– BD BOARD –
– MAIN BOARD –
– PANEL BOARD –
