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4 Operating Notes
4.8 Replacing Internal Fuses
Refer to fig. 5.
5 Cleaning
Important!
6 Troubleshooting
Problem
No sound.
In Voice Activation mode, a single microphone
is talked into but all microphones come on.
The system works but some Microphone
Stations do not.
20
3. To calm down a heated discussion, the chairperson can press and hold down the priority button to
mute all other microphones (except for those switched out of the priority bus). The microphones can
not be activated before the chairperson releases the priority button. In a system with several Base
Units, the priority key will mute only those microphones that are connected to the same Base Unit as the
Microphone Station on which the priority button was pressed.
Each Microphone Station bus (LINE 1 to LINE 4) has its own T4A slow-blow fuse and the motherboard
uses a T1A slow-blow fuse.
• If the rear panel ERROR Σ LED on the Base Unit and the red ERROR LED in the front panel OUTPUT
CONTROL section illuminate, the motherboard fuse has blown.
• If the front panel ERROR LED, the rear panel ERROR Σ LED, and one of the ERROR LEDs next to a
LINE connector illuminate, the fuse on the respective Microphone Station bus has blown.
Replace the defective fuse:
1. Switch power to the Base Unit and the related power supplies OFF.
2. Remove the fixing screws of the Base Unit top panel.
3. Remove the top panel.
4. Remove the defective fuse (
5. Insert a new fuse of the same type (
blow for the motherboard).
6. Screw the top panel back on the Base Unit.
1. Switch power to the Base Unit off and disconnect the power supply/supplies from power.
2. Use a cloth slightly moistened (not wet!) with water to clean the surfaces of the Base Unit, power sup-
plies, and Microphone Stations.
Never use caustic or scouring cleaners or cleaning agents containing alcohol or solvents since
these may damage the enamel or plastic parts.
Possible Cause
1. Power supply/supplies not connected to
power.
2. Power supply/supplies not connected to
Base Unit(s).
3. Power supply/supplies and/or Base Unit(s)
are OFF.
4. MIC DELEGATES LEVEL control fully CCW.
5. One or more internal fuses on the Base
Unit have blown.
1. Gate threshold too low.
2. Volume level of Microphone Station loud-
speakers is too high and mechanical noise
triggers gate.
1. Zero voltage at DC INPUT +1 or +2.
2. If you use two CS PS 20s, one may be
defective.
3. One of the internal fuses has blown (appro-
priate ERROR LEDs illuminated).
) from its holder.
: T4A slow-blow for LINE 1 through 4;
1. Connect power supply/supplies to a
suitable power outlet.
2. Connect power supply/supplies to Base
Unit(s)
3. Switch power to Base Unit(s) and/or power
supply/supplies on.
4. Turn MIC DELEGATES LEVEL control up.
5. Replace fuse(s).
1. Set dip switch no. 1 on Microphone
Stations to "OFF" ("1").
2a.Turn down SPEAKERS OUT control on
Base Unit.
2b.Use external sound system instead of
built-in loudspeakers.
2c.Use headphones instead of built-in loud-
speakers.
2d.Deactivate Voice Activation.
1. Refer to section 3.3.
2. Replace defective power supply.
3. Replace fuse (refer to section 4.8).
: T1A slow-
Remedy
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