MZ-E90
6-3-7. SCHEMATIC DIAGRAM — SYSTEM BOARD — • Refer to page 46 for IC Block Diagrams. • Refer to page 40 for Waveform.
(Page 38)
Note:
• 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.
•
A
: B+ Line.
• Power voltage is dc 1.5 V and fed with regulated dc power
supply from battery terminal.
• Voltage and waveforms are dc with respect to ground
under no-signal conditions.
no mark : PB
∗
: Impossible to measure
• 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.
J
: PB
*
IC801 is not replaceable
• The voltage and waveform of CSP (chip size package) can-
not be measured, because its lead layout is different form that
of conventional IC.
– 41 –
– 42 –
