6-1. Circuit Boards Location
MAIN board
LED board
HEADPHONE board
• WAVEFORMS
– MAIN Board –
– CASSETTE Board –
1
2
IC102 ws (XOUT)
Q715 (Collector)
(RECORD (1SS) mode)
3.4 Vp-p
12.7 µ s
139 ns
2 V/DIV, 4 µ s/DIV
1 V/DIV, 40 ns/DIV
SECTION 6
DIAGRAMS
POWER board
DISPLAY board
– DISPLAY Board –
3
IC601 i; (X2)
8.6 Vp-p
5.1 Vp-p
238 ns
1 V/DIV, 100 ns/DIV
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
B
C
E
These are omitted.
15
15
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
/
W or less unless otherwise
4
specified.
• 2 : nonflammable 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.
• 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