Oki B4100 - Manual (Page 480)

40055101TH Rev.4 480 /
4) Sending Frequency Response Adjustment
The adjustment of the high range frequency response is performed by changing the
capacitance of the capacitor C33. Increase the value of C33 to lower the amplitude of the
high range level. Decrease the value of C33 to raise the amplitude. The adjustnent of the
low range frequency response is performed by changing the capacitance of the capacitors
C35 and C37. Decrease the capacitance of C35 and C37 to lower the amplitude of the low
range level. Increase the capacitance of C35 and C37 to raise the amplitude.
Note: When the sending frequency response is changed, the sending loudness rating
(SLR) value may change. It is required to measure the SLR value again and verify
it.
5) Receiving Frequency Response Adjustment
The adjustment of the low range frequency response is performed by changing the capaci-
tance of the capacitor C26. Increase the capacitance of C26 to raise the amplitude of the
low range level. Decrease the capacitance of C26 to lower the amplitude.
The adjustment of the high range-frequency response is performed by changing the
capacitance of the capacitors C29. Decrease the capacitance of C29 to raise the amplitude
of the high range level. Increase the capacitance of C29 to lower the amplitude of the high
range level.
Note: When the receiving frequency response is changed, the receiving loudness rating
(RLR) value may change. It is required to measure the RLR value again and verify
it.
6) Side-Tone Adjustment
The side-tone adjustment is performed by the C-R networks corresponding to the indi-
vidual countries. For adjusting the side tone, select the corresponding C-R network by the
designated DIP switch and adjust the STMR value to the specified value by the values of
capacitors and resistors.
The dip-switch set to ON corresponds to the country as shown in the table.
Note: When the C-R network is changed for the side tone adjustment, the receiving
loudness rating (RLR) value may change. It is required to measure the RLR value
again and verify it.
7) DC V-I Characteristics
The DC V-I characteristics at the time of the line supplement is performed by diodes D10,
D11 and SW4-5, and can be selected from two types by setting of dip-switch 4-5. In case
SW4-5 is set to ON, since D10, and D11 are short-circuited, V/I value is lowered. In case
SW4-5 is set to OFF, V/I value is raised.
Country Dip-switch Symbol (network)
UK SW1-1 R19, C16, R22
Italy /
Belgium
SW1-2 R20, C17, R23
Denmark SW1-3 R21, C18, R24
Norway SW1-4 R62, C47, R63