– 48 –
– 49 –
– 48 –
– 47 –
– 50 –
ZS-D50
r
Refer to page 26 for Circuit Boards Location.
6-8. PRINTED WIRING BOARDS (TUNER SECTION)
D1
C-2
D2
C-2
D3
E-3
D4
D-3
D5
G-4
IC1
D-4
IC2
C-6
Q1
G-4
Q2
G-5
Q3
H-5
Q4
F-5
Q5
H-5
Q6
F-4
Q9
F-5
Q10
F-5
Q11
D-6
Q12
E-5
Q15
G-7
Q16
G-6
Q18
H-7
Q21
G-6
Q22
I-5
Q23
B-3
Ref. No.
Location
r
Semiconductor
Location
Note:
•
X
: parts extracted from the component side.
•
b
: Pattern from the side which enables seeing.
6-9. SCHEMATIC DIAGRAM (TUNER SECTION)
r
Refer to page 55 for IC Block Diagrams.
r
Waveforms (Tuner Section)
1
IC2
@¡
(X OUT)
VOLT/DIV : 0.5 V AC
TIME/DIV : 5
µ
sec
350 mVp-p
75 kHz
Note:
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
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.
•
¢
: internal component.
•
U
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 12V and fed with regulated dc power
supply from external power voltage jack.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
<
> : MW
[
] : LW
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
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