33
33
tuner unit
(TU1)
COMPUTER board
DIGITAL board
CONNECTION board
SENSOR board
KEY board
RELAY board
SERVO board
MAIN board
3-5. CIRCUIT BOARDS LOCATION
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
For schematic diagrams
• 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
/
4
W or less unless otherwise
specified.
•
%
: indicates tolerance.
•
f
: internal component.
•
C
: panel designation.
•
U
: B+ Line.
• Power voltage is dc 14.4V and fed with regulated dc power
supply from ACC and BATT cords.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
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.
F
: FM
f
: AM
J
: MD
For printed wiring boards
•
X
: parts extracted from the component side.
•
Y
: parts extracted from the conductor side.
•
a
: Through hole.
•
f
: internal component.
•
b
: Pattern from the side which enables seeing.
(The other layer’s patterns are not indicated.)
Note: The components identified by mark
0
or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
Caution:
Pattern face side: Parts on the pattern face side seen from the
(Side B)
pattern face are indicated.
Parts face side: Parts on the parts face side seen from the
(Side A)
parts face are indicated.
• Waveforms
(MODE:PLAY)
(SERVO/COMPUTER BLOCK)
1
2
3
IC440
ek
(RF)
1.4Vp-p
Approx.
0.5Vp-p
4
5
6
7
8
IC400
wg
(LRCK)
IC400
wh
(XBCK)
IC520
ea
(CAPA+)
4.8Vp-p
4.8Vp-p
4.4Vp-p
4.4Vp-p
3.4Vp-p
24µsec
0.35µsec
2.8µsec
IC440
wh
(TE)
Approx.
0.3Vp-p
IC440
ef
(FE)
IC520
es
(CAPA–)
2.8µsec
IC560
os
(XO)
3.68MHz
