Ncu Pcb - Brother FAX-170 Service Manual
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Also See for FAX-170:
- Service manual (192 pages) ,
- Owner's manual (74 pages) ,
- Service manual (169 pages)
Table of Contents
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3.3
NCU PCB
The NCU PCB switches the communications line to telephone or built-in MODEM, under the
control of the main PCB.
FAX-170/190/510/HOME FAX
1
8
1
Surge absorber
2
Line relay (CML relay)
Line transformer
3
4
Circuit related to the line transformer
5
High-impedance transformer circuit
Calling signal detector
6
7
Loop current detector
8
Dial pulse generator
Telephone circuit
9
:
Reference voltage generation circuit for the operational amplifier in 4
2
3
6
7
9
NCU PCB Circuit Diagram (U.S.A. versions)
III – 31
4
5
:
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Troubleshooting
