EFJohnson 3000 SERIES - Manual (Page 122)

TELEPHONE INTERFACE MODULE (TIM)
14-12
The TIM should be pre-aligned using the Basic
Board Module alignment procedures, Section 14-18.
Input With Personality Card Installed
1. Jumper T201, pin 8 to T202, pin 12.
2. Insert 1004 Hz at -12 dBm with a 600 ohm driving
impedance into the EQU of J1.
3. Set S5 for Test 7 ( sections 1, 2 and 3 open, close 4).
4. Reset the module, Press S2 and release.
5. Adjust R41 for -6 dBm
±
0.5 dB at J11.
6. Verify -6 dBm
±
1 dB at TP5.
7. Adjust R214 on the personality card for -12 dBm
±
1 dB at EP223 (DTMF input level).
8. Adjust R210 on the personality card for -12 dBm
±
1 dB at EP222.
9. Set S5 for normal operation (all sections closed).
10.Reset the module, Press S2 and release.
Bandpass Filter and Pulse Detector
1. Jumper T201, pin 8 to T202, pin 12.
2. Insert 395 Hz at -12 dBm with a 600 ohm driving
impedance into the EQU of J1. (The typical Dial
Tone is 380 + 440 Hz, the 395 Hz simulates this Dial
Tone.)
3. Set S5 for Test 7 (sections 1, 2 and 3 open, close 4).
4. Reset the module, Press S2 and release.
5. Verify -6 dBm
±
0.5 dB at J11.
6. Verify -6 dBm
±
1 dB at TP5.
7. Adjust R210 on the personality card for 0 dBm
±
1 dB at EP222.
8. Adjust R257 for a peak level at U203, pin 7
(typically -1 dBm
±
1 dB).
9. Set Detector
a. Measure EP225 with an oscilloscope.
b. Adjust R274 until EP225 is high ( >4V).
c. Adjust R274 until EP225 just goes low (< 0.8V).
d. Verify that EP226 is a square wave of the input
waveform.
5. Set S5 for normal operation (all sections closed).
6. Reset the module, Press S2 and release.
Output
1. Jumper T201, pin 8 to T202, pin 12.
2. Place a 600 ohm resistor in series with a non-polar-
ized 2.2
µ
F capacitor in EQU J1.
3. Set S5 for Test 1 (1 open, close 2, 3 and 4).
4. Reset the module, Press S2 and release.
5. Adjust R83 for -3 dBm
±
0.5 dB at TP3.
6. Adjust R44 to be -9 dBm
±
1 dB at J12.
(This provides a maximum level of -13 dBm
±
2 dB
across the line. The loss is due to the hybrid trans-
former. Verify the level across the 600 ohm resistor
and 2.2
µ
F cap is -13 dBm
±
2 dB, measure with a
balanced non-grounded AC voltmeter.)
7. Mobile Speech Detection
a. Set S5 for Test 7 (section 1, 2, 3; open, close 4).
b. Reset the module, Press S2 and release.
c. Insert 700 Hz into J2 EQU with a 600 ohm
balanced ungrounded oscillator.
d. Set oscillator for -15 dBm at J201, pin 5.
e. Adjust R282 for -18 dBm
±
1 dB at EP227.
f. Adjust R286 (counterclockwise) for a peak at
U220, pin 7, -19 dBm
±
1 dB.