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MZ-R909
3737
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
/
4
W or less unless otherwise
specified.
• % : indicates tolerance.
• C : panel designation.
• A : B+ Line.
• Total current is measured with MD installed.
• Power voltage is dc 3 V and fed with regulated dc power
supply from external power voltage jack.
• Voltages and waveforms are dc with respect to ground in
playback mode.
no mark : PLAYBACK
( ) : REC
∗
: Impossible to measure
• 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.
E : PLAYBACK
k : REC (ANALOG IN)
l : REC (DIGITAL IN)
• The voltage and waveform of CSP (chip size package)
cannot be measured, because its lead layout is different
form that of conventional IC.
* Replacement of IC801 used in this set requires a spe-
cial tool.
6-4. 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.
• : 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.
• MAIN board is four-layer printed board.
However, the patterns of layers 2 and 3 have not been
included in this diagrams.
* Replacement of IC801 used in this set requires a spe-
cial tool.
• Lead Layouts
surfac
e
Lead layout of conventional IC CSP (chip size package)
Note: The components identified by mark 0 or dotted line
with mark 0 are critical for safety.
Replace only with part number specified.
2.3 Vp-p
5.7 µs
2.3 Vp-p
5.7 µs
• Waveforms
1 IC601 4 (CLK) (PLAYBACK mode)
500 mV/DIV, 2 µs/DIV
2 IC901 th (CLK) (PLAYBACK mode)
500 mV/DIV, 2 µs/DIV