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ICF-CD873L
• Waveforms
– MAIN Board –
6 IC501 #¡ (RF O), IC502 #§ (RF)
!¡ IC50 1 (XOUT) (RADIO ON mode)
1 IC401 %• (X1) (RADIO ON mode)
(CD PLAY mode)
500 mV/DIV, 10 µs/DIV
1 V/DIV, 100 ns/DIV
200 mV/DIV, 500 ns/DIV
1.3 ± 0.5 Vp-p
3.7 Vp-p
13.3 µs
238 ns
7 IC501 $™ (TEO) (CD PLAY mode)
100 mV/DIV, 500 ns/DIV
2 IC601 %∞ (XT1) (RADIO ON mode)
1 V/DIV, 10 µs/DIV
Approx.
144 mVp-p
3.2 Vp-p
8 IC502 $™ LRCK (CD PLAY mode)
2 V/DIV, 10 µs/DIV
30.5 µs
3 IC501 1 (FEO) (CD PLAY mode)
100 mV/DIV, 50 ns/DIV
5.3 Vp-p
Approx.
136 mVp-p
22.8 µs
9 IC502 $§ (BCK) (CD PLAY mode)
4 IC501 !ª (CLK), IC502 !¶ (CLK0)
2 V/DIV, 200 ns/DIV
(CD PLAY mode)
5 V/DIV, 10 µs/DIV
5.3 Vp-p
5.4 Vp-p
472 ns
14.3 µs
0 IC502 &£ (XTAI) (CD PLAY mode)
5 IC501 @º (XLT), IC502 !§ (XLT0)
500 mV/DIV, 50 ns/DIV
(CD PLAY mode)
5 V/DIV, 200 ns/DIV
1.4 Vp-p
5.2 Vp-p
59 ns
102 ns
– 29 –
6-6.
SCHEMATIC DIAGRAM – POWER SUPPLY Section – •
See page 38 for IC Block Diagrams.
1.3 Vp-p
– 30 –
– 31 –
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.
• 5 : fusible resistor.
• C : panel designation.
Note: The components identified by mark ! or dotted line
with mark ! are critical for safety.
Replace only with part number specified.
• U : B+ Line.
• Voltages are dc with respect to ground under no-signal
(detuned) conditions.
no mark : FM
[
] : CD PLAY
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
– 32 –
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