3131
XR-M500R/M550
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
• 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.
7-5. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
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.
•
f
: internal component.
• C : panel designation.
• U : B+ Line.
• H : adjustment for repair.
• 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
〈〈 〉〉 : TAPE PLAYBACK
• 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 : TAPE PLAY
• Please refer to servicing notes (page 3) for system of
TYPE A, B, C and D.
• Waveforms
– MAIN Board –
1 IC701 5 OSCI
2 IC601 ud XIA
3 IC601 od X1
4 IC607 ih EXTAL
– DISPLAY Board –
1 IC901 y; OSC
2.4 Vp-p
232 ns
3.1 Vp-p
306
µ
s
3 Vp-p
54 ns
3.2 Vp-p
22.8
µ
s
3.2 Vp-p
22.8
µ
s
5.5 Vp-p
272 ns
2 IC902 y; OSC
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