TB 9-6625-2316-35
(8) Press the RESET pushbutton and disconnect resistance standards No. 2 and
No. 3.
b. Adjustments. Perform 8b above, if not previously performed. Otherwise, no other
adjustments can be made.
11. Crosstalk
a. Performance Check
(1) Set FUNCTION switch to XTALK.
Ensure that no other equipment is
connected to TI.
(2) Set AUTO/SINGLE switch to AUTO.
(3) Press the ADVANCE pushbutton once. The TI TEST light will be flashing on
and off as each pair combination is being tested, beginning with 01 - 01 and ending with 26
- 26. The FAULT light should remain off, and upon completion, the END light should
temporarily come on. If the FAULT light comes on, perform b below.
b. Adjustments
(1) Press the RESET pushbutton.
(2) Set AUTO/SINGLE switch to SINGLE.
(3) Set POWER switch to OFF. Remove TI from its casing. Remove the end plate
(located near the interface connector J100). Ensure that potentiometers R1, R2, and R3
and the test points TP1, TP2, and TP3, located on A3 measurement card, are readily
(4) Set POWER switch to ON.
(5) Set resistance standard No. 1 for 16.78 kΩ and connect between pin 1A and pin
2A (fig. 1). Set resistance standard No. 2 for 16.78 kΩ and connect between pin 1B and pin
(6) Press ADVANCE pushbutton a few times until circuits 01 02 are under test.
(7) Measure the dc voltages at TP-1 and TP-2. If the two readings are within 0.5%
of each other, the crosstalk detector is in good operating condition. Repeat 11a above after
disconnecting both standard resistors from TI.
(8) If the readings differ from each other more than 0.5%, perform paragraphs (9)
through (16) below.
(9) Reset the test set and disconnect standard resistors No. 1 and No. 2.
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