Oki OKIFAX 5400 Maintenance Manual page 336

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
5) Receiving Frequency Response Adjustment
The adjustment of the low range frequency response is performed by changing the
capacitance 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
6) Side-Tone Adjustment
The side-tone adjustment is performed by the C-R networks corresponding to the
individual 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
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.
40838301TH Rev.1
(SLR) value may change. It is required to measure the SLR value again and
verify it.
rating (RLR) value may change. It is required to measure the RLR value again
and verify it.
loudness rating (RLR) value may change. It is required to measure the RLR
value again and verify it.
Country Dip-switch Symbol (network)
UK SW1-1
Italy
/
SW1-2
Belgium
Denmark
SW1-3
Norway SW1-4
A3 - 55
TELU/TEL-W2/TEL-W1/TEL-W2D/TEL-W2F
R19, C16, R22
R20, C17, R23
R21, C18, R24
R62, C47, R63