Dial Tone And Busy Tone Detection Level - Oki OKIFAX OF-38 Field Service Manual

Dial Tone and Busy Tone Detection Level (1)

5.1.2
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.
HIGH
Output
Level
Control
Required tool
Measurement
Connect an oscilloscope probe between the IC5-8 pin and the IC5-1 pii.
(See Figure 5.1.2 at next page.)
Connect the leads of the oscillator at line terminals Ll and L2.
Turn on the AC power switch.
Verify the specifications.
: NCU-181
tone of 400 Hz at - 30.0 dBm is input to the line
terminals, and
when a tone of 400 Hz at - 32.0 dBm is input to
the line terminals.
5 - 3