55
2-3. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
•
f
: internal component.
• : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side: Parts on the pattern face side seen from
(Conductor Side) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Component Side) the parts face are indicated.
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.
•
f
: internal component.
• C : panel designation.
• U : B+ Line.
• H : adjustment for repair.
• Power voltage is dc 14.4 V and fed with regulated dc power
supply from ACC and BATT cords.
• Voltages and waveforms are dc with respect to ground in
CD play mode.
• 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.
• Circled numbers refer to waveforms.
• Signal path.
J : CD PLAY
• IC Block Diagram
– FM Board –
IC701 BH1415F-E2
+
–
+
–
PHASE
DETECTOR
22 21 20 19 18 17 16 15 14 13 12
1 2 3 4 5 6 7 8 9 10 11
L. P. F.
L. P. F.
SHIFT REGISTER
PROGRAM COUNTER
1
4
1
50
1
19
VCC
2
MUTE
MPX
OSC
0
+
1
2
RF
PRE-EMPHASIS
& LIMITER
L-CH INPUT
PRE-EMPHASIS TIME CONSTANT
LPF TIME CONSTANT
PILOT SIGNAL ADJUST
AUDIO MUTING
DATA
CLOCK
CHIP ENABLE
X'TAL OSCILLATOR
X'TAL OSCILLATOR
PLL VCC
R-CH INPUT
PRE-EMPHASIS TIME CONSTANT
LPF TIME CONSTANT
FILTER
COMPOSITE SIGNAL OUTPUT
GND
PLL PHASE DETECTOR OUTPUT
VCC
RF OSCILLTOR
RF GND
RF OUTPUT
• Waveforms
– FM Board –
1 IC701 qd (XOUT)
2 IC701 qa (RF OUT)
3.4 Vp-p
131.6 ns
656 mVp-p
14.3 ns
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