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5-4. SCHEMATIC DIAGRAM – BASE MAIN SECTION (1/2) –
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.
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 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 production
tolerances.
• Signal path.
F
: RX (INTERCOM)
f
: TX (INTERCOM)
E
: RX (LINE2)
j
: TX (LINE2)
N
: RX (LINE1)
O
: TX (LINE1)
– 23 –
SPP-M937
– 24 –
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