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2-2.
SERVICING NOTES
• Model Identification
There are three types of main board in according of destination
for MDX-C8500R.
– MAIN BOARD (Component Side)
R502
R503
IC502
R502
R503
×
TYPE A
a
×
TYPE B
a
TYPE C
a
a
Type A, B and C can be identified by its model number label at
the buttom of the set.
– SPECIFICATION LABEL –
TYPE A
TYPE B
TYPE C
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.
• b : 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.
7
7
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.
•
: internal component.
f
• 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 and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(
) : AM(MW/LW)
[
] : LW
〈〈
〉〉 : MD PLAY
• 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.
F
: FM
f
: AM(MW/LW)
L : BUS AUDIO IN
E
: MD PLAY
• Please refer to servicing notes for system of TYPE A, B
and C.
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