Note For Printed Wiring Boards And Schematic Diagrams; Main Board (Component Side) - Sony XR-C8220 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 are dc with respect to ground under no-signal
(detuned) conditions.
no mark : FM
( ) : AM
〈〈 〉〉 : 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
L : BUS AUDIO IN
E : TAPE PLAYBACK
– 27 –
• Waveforms
– MAIN Board – – KEY Board –
1 IC10 @º (XOUT) 1 IC900 @º (OSC-IN)
3.8 Vp-p
139 ns
2 IC600 &¢ (X0A) 2 IC900 @¡ (OSC-OUT)
3.6 Vp-p
30.6 µ s
3 IC600 (£ (X1)
– INVERTER Board –
1 Q556 (EMITTER)
5.8 Vp-p
272 ns
4 IC650 2 (XT)
3.8 Vp-p
236 ns
2 Vp-p
5.5 µ s
6.8 Vp-p
3.3 µ s
10 Vp-p
1.1 ns
– 28 –