– 39 –
– 41 –
– 40 –
5-5. SCHEMATIC DIAGRAM – MAIN SECTION (1/3) –
PMC-DR50L/DR70L
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.
• 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
f
: MW
L
: LW
r
Waveforms – MAIN SECTION (1/3) –
r
Refer to page 74 for IC Block Diagram.
1
IC3
@¡
2
VOLT/DIV : 0.5 V AC
TIME/DIV : 5 msec
IC4
!¢
VOLT/DIV : 0.2 V AC
TIME/DIV : 50 nsec
1.5Vp-p
75kHz
556mVp-p
4.332MHz
