Shure 27C8642 manual Transmitter audio gain adjustment

ENGLISH

Transmitter Battery Installation

1.Slide the transmitter ON/OFF switch to the OFF position.

2.Press down on the OPEN side of the battery compartment cover, slide it back and flip it open, as shown in Figure 11.

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FIGURE 11

3.Insert a fresh 9V alkaline battery into the battery compartment as shown in Figure 11 (Duracell MN1604 recommended and included with the system). A fresh 9V alkaline battery should typically provide 18 hours of performance time. A fully charged 8.4V NiCad battery should provide 2 hours of perfor- mance time. When the red LOW BATTERY light on the trans- mitter glows, you have 1 hour or less of useful battery life remaining; change the battery at your first opportunity.

IMPORTANT: Carbon-zinc and zinc-chloride batteries will not provide adequate power and are not recommended.

4. Replace the battery cover.

Transmitter audio gain adjustment

The transmitter audio gain control has been factory preset to provide satisfactory output. However, if the PEAK light on the T88 receiver is constantly on or never on, the transmit audio level may require adjustment. Use the gain controls as follows to adjust the equipment for the best sound quality.

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FIGURE 12

To adjust the audio gain, locate the transmitter audio gain con- trol and use the supplied screwdriver to adjust the control.

•If the PEAK light is always on, decrease the audio gain by turning the gain control counter-clockwise (while the vocalist is singing or the musical instrument is being played) until the PEAK light on the receiver flickers only occasionally.

•If the PEAK light is never on, increase the audio gain by turn- ing the gain control clockwise (while the vocalist is singing or the musical instrument is being played) until the PEAK light on the receiver flickers only occasionally.

TIPS AND TROUBLESHOOTING

Tips for getting the best performance

•Maintain a line-of-sight between the transmitter and receiver antennas.

•Keep the receiver and antennas away from large metal ob- jects.

•Avoid placing the receiver near computers or other RF gen- erating equipment.

•Point the receiver antennas straight up.

•Avoid placing the receiver in the bottom of an equipment rack unless the antennas are remotely located.

Troubleshooting

Some common problems and their solutions are identified in the table below. If you are unable to solve a problem, contact your dealer.

Problem		Solution
No sound; RF light(s)	•	Make sure the transmitter
not glowing.		POWER switch is ON and the
		receiver is plugged into a power
		source.
	•	Check battery.
	•	Check receiver squelch setting.
	•	Check receiver antenna
		connection(s).
	•	Make sure antennas are in line of
		sight of transmitter.
No sound; RF and Audio Level	• Turn up receiver audio VOLUME
meter lights glowing.		control.
	•	Check for proper connection
		between receiver and karaoke
		unit.
	• Talk into microphone and observe
		receiver audio level lights. If they
		glow, the problem is elsewhere in
		the sound system.
Received signal is noisy or con-	•	Check battery.
tains extraneous sounds with	•	Remove local sources of RF
transmitter on.		interference.
	•	If using a guitar or other
		instrument, check connections.
	• Two transmitters may be operating
		on the same frequency. Locate
		and turn one off.
	• Signal may be too weak.
		Reposition antennas. If possible,
		move them closer to transmitter.
Noise from receiver with transmit-	•	Adjust receiver squelch control.
ter off.	• Remove local sources of RF
		interference.
	•	Reposition receiver or antennas.
Momentary loss of sound as trans-	•	Reposition receiver and perform
mitter is moved around performing		another “walkthrough” test and
area.		observe the RF indicators. If audio
		dropouts persist, mark these
		“dead spots” in performing area
		and avoid them during
		performance.

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