AKG HT 450, User Manual

32

Problem

No sound.

Noise, crackling, unwanted signals.

Distortion.

Momentary loss of sound ("dropouts") at

some points within performance area.

Error Messages

ERR.>SYS<

ERR.>PRE<

TXBand

ERR.>USR<

ERR.>RF<

Err.>IR<

>-h<

>ChArGE<

(rechargeable battery only)

Possible Cause

1. AC adapter is not connected to receiver

and/or power outlet.

2. Receiver is OFF.
3. Receiver is not connected to mixer or

amplifier.

4. Microphone or instrument is not connected

to bodypack transmitter.

5. Transmitter is tuned to different frequency

than receiver.

6. Transmitter is "OFF" or transmitter MUTE

switch at "MUTE".

7. Transmitter batteries are not inserted 

 properly.

8. Transmitter batteries/battery pack dead.
9. Transmitter is too far away from receiver or

squelch threshold setting is too high.

10.Obstructions between transmitter and

receiver.

11.Receiver is invisible from transmitter  location.
12.Receiver too close to metal objects.

13.Transmitter and receiver Preset versions

are not identical.

1. Antenna location.
2. Interference from other wireless systems,

TV, radio, CB radios, or defective electrical
appliances or installations.

1. GAIN control on transmitter is set too high

or too low.

2. Interference from other wireless systems,

TV, radio, CB radios, or defective electrical
appliances or installations.

•

Antenna location.

Problem

•

Frequency settings cannot be changed.

•

Error in selected Preset.

1. Transmitter frequency band is not identical

with receiver frequency band.

2. RF output too high/low.

•

Last setting cannot be loaded.

•

PLL error. (Receiver cannot lock on to
selected frequency.)

•

Infrared transmisison failed.

1. Transmitter cannot identify battery as dry

or rechargeable type.

2. Transmitter was switched on during charg-

ing.

•

Battery is not fully charged.

Remedy

1. Connect AC adapter to receiver and/or

power outlet.

2. Push POWER switch to switch receiver ON.
3. Connect receiver output to mixer or ampli-

fier input.

4. Connect microphone or instrument to

audio input on bodypack.

5. Tune transmitter and receiver to the same

frequency.

6. Switch transmitter "ON" or set MUTE

switch to ”ON” position.

7. Insert batteries conforming to "+" and "-"

marks.

8. Replace batteries/charge battery pack.
9. Move closer to receiver or choose lower

squelch threshold setting.

10.Remove obstructions.

11.Avoid spots where you cannot see receiver.
12.Remove offending objects or move receiv-

er away.

13.Check Preset versions on transmitter and

receiver.

1. Relocate receiver or antennas.
2. Switch off interference sources or defective

appliances or tune transmitter and receiver
to a different frequency; have electrical
installation checked.

1. Decrease or increase GAIN setting just

enough to stop the distortion.

2. Switch off interference sources or defective

appliances or tune transmitter and receiver
to a different frequency; have electrical
installation checked.

•

Relocate receiver or antennas. If dead
spots persist, mark and avoid them.

Remedy

1. Switch power to receiver OFF and back

ON after about 10 seconds.

2. If problem persists, contact your AKG

Service Center.

1. Continue with previous Preset.
2. Select error-free Preset.
3. If problem occurs frequently, contact your

AKG Service Center.

1. Use transmitter with the same frequency

band as the receiver.

2. Use transmitter with lower/higher Rf out-

put.

1. Set frequency and squelch threshold again.
2. If problem occurs frequently, contact your

AKG Service Center.

1. Set different frequency.
2. If problem persists, contact your AKG

Service Center.

•

Point transmitter infrared sensor directly at
receiver infrared emitter from a distance of
approx. 2 inches (5 cm).

1. Remove battery and reinsert after approx.

five seconds.

2. Remove transmitter from charger, switch off,

and restart charging (cf. CU 400 manual)

1. Charge transmitter using CU 400 charger.
2. Replace transmitter battery with new dry or

fully charged rechargeable battery.

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AKG WMS 450 V 1.10

6 Troubleshooting