1515
HCD-EP404
Note on Schematic Diagram:
• All capacitors are in µF 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.
• 2 : nonflammable resistor.
• C : panel designation.
Note on Printed Wiring Board:
• W : indicates side identified with part number.
• : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
• Indication of transistor
• A : B+ Line.
• H : adjustment for repair.
•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.
no mark : FM
<>: CD (STOP)
• Circled numbers refer to waveforms.
• Signal path.
F : FM
f : AM
E : PB (TAPE)
a : REC (TAPE)
J : CD PLAY
• WAVEFORMS
– MAIN Board – – CASSETTE Board – – DISPLAY Board –
1
IC102 ws (XOUT)
3.4 Vp-p
139 ns
1 V/DIV, 40 ns/DIV
2
Q715 (Collector)
(RECORD (1SS) mode)
2 V/DIV, 4
µ
s/DIV
3
IC601 i; (X2)
1 V/DIV, 100 ns/DIV
8.6 Vp-p
12.7
µ
s
5.1 Vp-p
238 ns
B
These are omitted.
CE
SECTION 6
DIAGRAMS
6-1. Circuit Boards Location
Note: The components identified by mark 0 or dotted line
with mark 0 are critical for safety.
Replace only with part number specified.
MAIN board
LED board
HEADPHONE board
DISPLAY board
POWER boar
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