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OKI OKIOFFICE 84
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of OKI OKIOFFICE 84 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

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Text excerpt from page 308 (click to view)
UNC/WN5/FN5/DN5 4.4 DN5 circuit diagram 1 Lightning arresters (AR1, 2) The nominal operating voltage is 500 V. When connecting the ground of the arrestor to the chassis, tighten ARG on the PCB with a screw. At this time, the PCB is grounded through the power cable. The TB1 arrestor ground terminal can also be used to connect to the earth directly. Loop current detector (IC4) - Optional When a line is hunt, this circuit detects a DC loop current to notify the fact. For detection (OH1), it outputs the low level to the nominal input current of 10 mA or more. Diode bridge (DB1) This circuit rectifies the loop current so that the DC circuit characteristics are not affected by a polarity change over the line. DC circuits (Q3, R540, R541, C13, R9, R209) These circuits provide DC characteristics according to the line requirements. Impedance matching network (R523, R536, C503, ...) This circuit matches the impedance between the line and equipment to reduce reflection of transmitted signals. It provides impedance (return loss) characteristics to meet the line requirement using the S4-3 and S4-4. Receiving sensitivity (R537, R539, R637, R639) The receiving sensitivity at line hunting is determined by R539 to R639 depending on the line impedance. Similarly, the MF tone receiving sensitivity at parallel pickup is determined by R537 or R637. The receiving sensitivity is set using the DIP switches S4-5 to S4-8. CML (RL1) This circuit selectively switches the line between the telephone or facsimile. SR (RL2) This circuit connects the line with the telephone. During facsimile transmission, it disconnects the telephone. DP (IC5) This circuit generates pulse dial signals. MUTE (IC7) During pulse dialing, this circuit closes to reduce the DC loop resistance. PP (RL6) If this circuits detects MF or CNG tones without seizuring a line, it disconnects NT (5) to increase the input impedance and also sets the receiving sensitivity. MUTE (RL3) During pulse dialing, this circuit opens to prevent pulse distortion caused by capacitor C11. If it detects MF or CNG tones without seizuring a line, it opens to increase the impedance. Pickup RC (R590, C31) These circuits insert a high-impedance resistor and capacitor serially to prevent the line impedance from dropping by the line transformer T1.

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40672201TH Rev. 4

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