Telex MCE325 User Manual Page 26
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2-6 CSI-200 User Instructions
Program Assignment – IFB Option (J4, J5, J16-J18)
Jumper J4 assigns PROGRAM A to two-wire CH 3 or four-wire CH B with interrupt during talk
(IFB A). Jumper J5 assigns PROGRAM B to CH 4 with interrupt during talk (IFB B).
(PROGRAM B is not used in four-wire mode.)
Jumpers J16, J17, and J18 assign the mono mix of both program inputs to the left headphone,
right headphone, and speaker respectively. Program volume to the headphones and speaker is
controlled by the PGM VOL control on the front panel.
See Table 2.2 for Jumper settings. See Figure 2.2 for locations of jumpers.
Balanced/Unbalanced Dynamic Microphone Selection (J24)
The MCE 325 may be used with headsets having either a balanced or unbalanced dynamic
microphone. The MCE325 is pre-programmed for use with an unbalanced microphone by
shorting J24 pins 2 and 3. For balanced microphones, remove the shorting jumper and reinstall it
to short pins 1 and 2.
Headphone Sidetone Trimmer Adjustment (R37)
The headphone sidetone trimmer (R37) adjusts the loudness of your own voice heard in your
headset when the microphone is on and the speaker is off. (It does not affect the actual level heard
on the intercom lines.) This trimmer is preset so that your voice level in the headphones will be
approximately ¾ of the intercom line level. To prevent feedback, this signal is automatically
turned off when the external speaker is turned on with the SPKR ON switch.
Speaker Dim Adjustment (R157)
When an external speaker is used, switching the microphone on will cause the speaker level to
attenuate. The level of attenuation may be adjusted with the speaker dim trimmer (R157). The
minimum attenuation of 6 dB is preset at the factory (R157 fully clockwise). The range of
adjustment is –6 dB to –40 dB.
Mechanical Installation
Dimensional requirements for the various mounting configurations are illustrated in Section 6.
Also allow an additional 4.0 inches (102 mm) of rear panel clearance for connectors.
If the headset connector is remotely located (See “External Headset”), allow space between the
cable and interfering sources such as TV monitors, power supplies and equipment with internal
power supplies. The MCE325 has no special ventilation space requirements.
Assembly of optional mounting components is shown in Figure 2.3.
- USER INSTRUCTIONS 1
- PROPRIETARY NOTICE 2
- COPYRIGHT NOTICE 2
- UNPACKING AND INSPECTION 2
- WARRANTY INFORMATION 2
- CUSTOMER SUPPORT 2
- RETURN SHIPPING INSTRUCTIONS 3
- TABLE OF CONTENTS 5
- Operation 3-1 6
- Maintenance 4-1 6
- Parts Lists 5-1 7
- Diagrams 6-1 7
- & S 9
- Front Panel Features 10
- Rear Panel Features 11
- Programming 12
- Mounting Configuration 12
- MCE325 Specifications 13
- MCS325 Specifications 14
- Figure 1.5 15
- Figure 1.3 15
- Figure 1.4 15
- Figure 1.6 16
- Figure 1.7 16
- Figure 1.8 17
- Figure 1.9 17
- Figure 1.10 18
- Figure 1.11 19
- 1-12 MCE325 User Instructions 20
- NSTALLATION 21
- Top cover removal 22
- Table 2.2 23
- Figure 2.2 24
- ISO (DS5) 25
- Remote Talk-off (DS7) 25
- VOX (DS8) 25
- Mechanical Installation 26
- Figure 2.3 27
- Electrical Installation 28
- Program Inputs, J14 and J15 29
- External Speaker, J27 29
- Auxiliary Connector, J22 29
- Remote Microphone Switch 30
- ISO Connection 30
- External Headset 30
- PIN # FUNCTION 31
- Table 2.9 32
- PERATION 33
- Microphone On/Off 34
- Speaker On/Off 34
- Volume Adjustment 34
- Front Panel Programming 35
- 3-4 CSI-200 User Instructions 36
- Instant Mic 37
- 3-6 CSI-200 User Instructions 38
- AINTENANCE 39
- Cleaning 40
- Test Equipment 40
- Power Supply Test 40
- Initial Configuration 41
- Keying Output Test 41
- Four-Channel, Two-Wire Mode 42
- Two-Channel, Four-Wire Mode 43
- True Sidetone Adjust 44
- Headphone 44
- Program A to Left Headphone 45
- IFB Test 46
- Panel Mic to Channel Test 48
- Carbon Mic to Channel Test 48
- VOX Test 48
- Mic Kill Receive Test 48
- Mic Kill Transmit Test 49
- Call Transmit Test 49
- Call Receive Test 49
- ISO Test 50
- Remote Mic Switch Test 50
- Program Lockout Test 50
- Noise Checks 50
- CSI-200 User Instructions 52
- Table 5.1 53
- Table 5.2 53
- Table 5.3 54
- Table 5.4 55
- Table 5.5 55
- Table 5.6 55
- Table 5.7 65
- S ECTION 67
- 6-2 CSI-200 User Instructions 68
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- TELETELEXX 82
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