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SPP-M937
5-5. SCHEMATIC DIAGRAM – BASE MAIN SECTION (2/2) –
Note:
• 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.
• 2 : nonflammable resistor.
Note: The components identified by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part number specified.
•
: B+ Line.
• H : adjustment for repair.
• Power voltage is dc 9V and fed with regulated dc power
supply from external power voltage jack (J6).
• Voltages and waveforms are dc with respect to ground in
test mode.
• 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.
N
: RX
P
: BELL
Waveform
z
1
1.3 Vp-p
4MHz
U2 2 XOUT
VOLT/DIV : 0.5 V AC
TIME/DIV : 0.1 µsec
– 25 –
– 26 –
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