Sony XM-N502 Service Manual page 7

THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
For Printed Wiring Boards.
Note:
• X : Parts extracted from the component side.
• Y : Parts extracted from the conductor side.
• : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
• Indication of transistor.
C
Q These are omitted.
B E
B C E
These are omitted.
Q
B C E
These are omitted.
• Abbreviation
IND : Indian model
XM-N502
SECTION 4
DIAGRAMS
For Schematic Diagrams.
Note:
• All capacitors are in μF unless otherwise noted. (p: pF) 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
specifi ed.
• 2 : Nonfl ammable resistor.
• C : Panel designation.
• A : B+ Line.
• B : B– Line.
• Power voltage is dc 14.4 V and fed with regulated dc
power supply from +12 V and REM terminals.
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark : POWER ON
• Voltages are taken with VOM (Input impedance 10 M).
Voltage variations may be noted due to normal production
tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F : AUDIO
• Abbreviation
IND : Indian model
• Waveforms
– MAIN Board –
IC901 5 (CT)
1
3 Vp-p
20 s
2 V/DIV, 10 s/DIV
2 Q910, 911 (Drain)
29.6 Vp-p
39.6 s
20 V/DIV, 20 s/DIV
• IC Block Diagram
– MAIN Board –
IC901 TL594CD-R2
ERROR
AMPLIFIER 1
1IN+ 1
+
–
1IN– 2
0.7mA
3
FEEDBACK
PWM
PULSE-STEERING
COMPALATOR
FLIP-FLOP
C1
4
DTC
CTC
COMPALATOR
CT 5
OSCILLATOR
RT 6
GND 7
C1 8
7 7
ERROR
AMPLIFIER 2
16 2IN+
+
–
15 2IN–
REFERENCE
14 REF
REGURATOR
UNDER
VOLTAGE
LOCKOUT
CONTROL
1D
13 OUTPUT CTRL
12
VCC
11 C2
E2
10
9 E1
XM-N502