Note For Printed Wiring Boards And Schematic Diagrams - Sony XR-C7220R Service Manual

6-5.

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.
•
r : Through hole.
• 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.
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.
• 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 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.
• Signal path.
F
: FM
f : AM (MW/LW)
L : BUS AUDIO IN
E : TAPE PLAY
– 31 –
• Waveforms
– MAIN Board –
1 IC10 @º (XOUT)
3.8 Vp-p
139 ns
2 IC150 4 (OSCO)
3.6 Vp-p
230 ns
3 IC600 &¢ (X0A)
3.6 Vp-p
30.6 µ s
4 IC600 (£ (X1)
5.8 Vp-p
272 ns
XR-C7220R
– KEY Board –
1 IC900 @º (OSC-IN)
2 Vp-p
5.5 µ s
2 IC900 @¡ (OSC-OUT)
6.8 Vp-p
3.3 µ s
– INVERTER Board –
1 Q556 (EMITTER)
10 Vp-p
1.1 ns
– 32 –