Manley Stingray iTube - Manual (Page 18)

TROUBLESHOOTING
It is rare that any of these problems occur, but here are some things to try if something is “wrong”:
HUM - Try a mains ground adapter if they are legal in your country. They are also called 3 pin to 2 pin adapters (or
“cheaters”) and are available in hardware stores. There should be one ground in your system and only one. If two or
more pieces of gear have 3 pin AC cables a ground loop can occur which will usually cause hum. The Stingray iTube
is probably the best grounded single piece as it is the center of your system.
HISS - Usually one of the sources. This source may have a volume control that is turned down and forcing you to turn
up the volume of the Stingray iTube. Adjust the source so that it is a similar volume as your other sources. If it seems
to be the one channel of the Stingray iTube, then it is probably an input tube (12AT7WA). Most tubes should last
many years but sometimes they get noisy prematurely. To verify, you can swap the two 12AT7s (with the power off)
then test again. Be careful - tubes can be hot (let them cool down for a few minutes or wear a glove), don’t bend any
pins and gently wiggle the tube to remove it or insert it. Force should not be needed.
BALANCE - The two speakers sound different - It may be the CD or source and the way it was recorded. First try a
different source. Next try swapping the inputs. Power down and swap left and right inputs. If it is the source, then the
problem will “follow” the swap. Return them to normal (L=L). Power down again and next try swapping the speaker
connections by putting the left speaker wire in the right terminals and right wires into the left terminals. If the problem
switched sides then the Stingray iTube is suspect, if the problem stayed on the same side it is probably a damaged or
fatigued speaker.
ONE CHANNEL DEAD - Usually just a bad connection or an interconnect is plugged in wrong. Check your wiring.
You can try any of the other inputs and verify that both channels work on other inputs or not. The Balance Control
is adjusted for “center”? You might try swapping the speaker interconnects at the Stingray iTube end. If the problem
swaps sides then it may be the Stingray iTube. In that case, the two most likely problems are a bad tube (12AT7 or
6414) or a blown 250 mA (MDL 1/4) B+ fuse accessible through the sides of the unit. See page 8 for details on chang-
ing this fuse.
TUBE GLOWS CHERRY RED - This is where you can see the plate area of the tube glowing red hot (they are nor-
mally gray or black and are the most visible part inside the tube). This indicates a bias problem or a bad tube; immedi-
ately attempt to re-bias the tube in question (see page 15). If the bias cannot be adjusted on that tube, immediatley turn
off the power; the tube will have to be replaced. It is normal to see a slight blue glow that seems to coat the inside of
the glass.
REMOTE DOESN’T FUNCTION - Dead batteries? Try aiming the remote directly at your Stingray iTube. If you
press any button on the remote, a red LED should light up at the 2:00 position on the Input Selection knob. If the LED
does not illuminate, try changing the batteries. If that doesn’t fix it, make sure the Stingray iTube is set to recieve
signal from the remote - see “Remote Control Configuration” on page 9 of this manual to learn how to configure your
remote control.
To “pair” your remote control with your Stingray iTube: First, turn off the main power switch on the
rear of your Stingray iTube. Then, while pressing the front-panel volume knob IN, switch the main
power ON. When the lights stop spinning on the front panel, release the volume knob and press any but-
ton on the remote control. Your remote is now “mated” with your Stingray iTube!
NO SOUND FROM INPUT 4 (iPod) - Is your iPod plugged in correctly and firmly seated on its connector? If the
Stingray iTube doesn’t think an iPod is plugged in, it will not be able to play tunes from it. Try removing it and replac-
ing it on the connector - be careful, the connector is delicate and can be damaged if abused!
NO SOUND AT ALL - Is the unit in Standby? Is the unit Muted? Is the INSERT loop active (1:00 LED glowing red
on the Input Selection knob) with no signal coming in to the LOOP RETURN? This will mute the Stingray iTube, as it
will not hear anything coming back from the REC OUT output (see pages 7 & 8 for more info).
Feel like you’ve inadvertently set up a Menu function incorrectly? Can’t figure out how to undo it? See page 9 for
instructions on RESTORING YOUR STINGRAY iTUBE TO FACTORY DEFAULT SETTINGS.
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