Sony HCD-EC68P, Service Manual

Page: 27 / 66

HCD-EC68P/EC78P
HCD-EC68P/EC78P
27 27
For Schematic Diagrams.
Note:
• 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
speci fi ed.
•
f
: internal component.
•
2
: non fl ammable resistor.
•
C
: panel designation.
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
•
A
: B+ Line.
•
B
: B– Line.
•
C
: adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
– CD Board –
no mark : CD PLAY
– Other Boards –
no mark : TUNER (FM/AM)
• Voltages are taken with a VOM (Input impedance 10
M
Ω
).
Voltage variations may be noted due to normal production
tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f
: AM
J : CD PLAY
i : AUDIO IN
g
: DMPORT
• Abbreviation
AUS :
Australian model
CND : Canadian model
For Printed Wiring Boards.
Note:
•
X
: Parts extracted from the component side.
• Y : Parts extracted from the conductor side.
•
W
: indicated side identi fi ed with part number.
•
f
: Internal component.
• : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
• Indication of transistor.
C
B
These are omitted.
E
Q
• Circuit Boards Location
KEY POWER board
PANEL board
MAIN board
HI AMP board (EC78P)
LOW AMP board
PT board
REG board
JACK board
DMP board
KEY CD board
CD board
MOTOR board (EXCEPT EC78P: UK)
B
These are omitted.
C E
Q
The components identi fi ed by mark 0 or dotted line with
mark
0
are critical for safety.
Replace only with part number speci fi ed.
Caution:
Parts face side:
(Conductor Side)
Pattern face side:
(Component Side) Parts on the parts face side seen from
the pattern face are indicated.
Parts on the pattern face side seen from
the parts face are indicated.