5.1.3
Dial Tone and Busy Tone Detection Level (2)
Service personnel can adjust the dial tone and the busy tone detection level with a
potentiometer.
The disassembly procedure to reveal the NCU-181 is described in sub-item 7.3.5 in
Chapter 7.
PC board name
NCU-181
Measurement points
pin and
pin
The
pin reading becomes Low V) when a
HIGH
tone signal of 400 Hz at 25.0
is input to
the line terminals, and
The
pin reading becomes High (5 V) when
output
a tone signal of 400 Hz at 27.0
is input to
Level
the line terminals.
LOW
27.0
- 2
Level
Control
RV3 (potentiometer)
Required tool
Oscilloscope, Oscillator, Attenuator
Measurement
Connect an oscilloscope probe between the
pin and the
pin.
Figure 5.1.3 at next page.)
b)
Connect the leads of the oscillator at line terminals and
Turn on the AC power switch.
d)
Verify the specifications.
5 - 5
Summary of Contents for OKIFAX OF-38
Page 1: ...OfClFAx OF 38 Facsimile Transceiver HELD SERVICE HANDBOOK...
Page 2: ...OKIFAX OF 38 FACSIMILE TRANSCEIVER FIELD SERVICE HANDBOOK 0 0...
Page 7: ...C H A P T E R I GENERAL INFORMATION 0 0 s...
Page 8: ...CHAPTER 1 GENERAL INFORMATION 1 1 Features l l 1 2 GeneralAppearance l 3 0 0 c7...
Page 12: ...Fig 1 2 3 Operation Control Panel of the OKIFAX OF 38 l 4...
Page 13: ...0 0 co CHAPTER 2 SPECIFICATIONS...
Page 31: ...2 1 8...
Page 39: ...2 2 6...
Page 52: ...09s r El 1 SLl r pr Fig 2 1 General appearance and dimensionsof the OKIFAX OF 38 2 39...
Page 53: ...CHAPTER 3 lNSTALi_ATION...
Page 77: ...Table3 7 3 PTT parameter 3 2 3...
Page 112: ...Fig 3 13 1 Flow chart for typical message reception 3 5 8...
Page 113: ...Fig 3 13 2 Flow chart for typical message transmission 3 59...
Page 114: ...CHAPTER 4 MAINTENANCE...
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Page 160: ...CHAPTER 5 ADJUSTMENT...
Page 174: ...n mmmmm m mrm m 5 1 3...
Page 175: ...3 Scanner assembly SNS 18 PC BOARD SCREW SHIELDING PLATE Fig 5 2 4 Scanner assembly 5 14...
Page 186: ...CHAPTER 6 TROUSLESHOOTING...
Page 191: ...0 0 0 Fig 6 1 1 MODEM PC board 6 4...
Page 198: ...Li YU3512 1667 Fig 6 1 2 NCU 181 PC board JC3 6 1 1...
Page 211: ...Note No INo 6 2 4...
Page 214: ...6 2 4 Document Skew Put a smaller original in the carrier sheet and fed them together 6 2 7...
Page 220: ...C H A P T E R 7 DISASSEMBLY ASSEMBLY P...
Page 225: ...f 3z _ d 7 4...
Page 252: ...5 Remove a screw 0 SCREW 6 Remove the two screws Fig 7 3 11 3 SCREWS BOARD Fig 7 3 11 4 7 31...
Page 268: ...CHAPTER 8 BRIEF TECHNICAL DESCRIPTION...
Page 270: ...OKIFAX OF 38 overall circuit diagram Fig 8 1 1 m _ n 111 I I 1 Cl...
Page 271: ...t j_1 I 1 I I 1 c I_ c 8 3...
Page 273: ...m I j jj Read hugeData _ _t PrintlmageData...
Page 274: ...1 I _ __ __ _ M B 1 Fig 8 2 2 _ OKIFAX OF 38 G3 data send signal flow...
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