Laney LR5 - Manual (Page 17)

TUNER OPERATION: By pressing the Tuner Button the amplifier will Mute and the tuner
function will be activated.
The round LED will flash to indicate Tuner operation.
The AMP selector should then be used to select each string in
turn to be tuned.
These are E,B,G,D,A,E and numbered 1-6 with 1 being the High
“E” and 6 being Low “E”
Adjust the string tension to make just the centre LED light.
(As the tune is approached, the centre LED and the LED from the
direction of tune will speed up flashing to show you are getting
close to the in tune position.
When in tune the LEDs will stop flashing and only the Centre
LED will be continuously lit.
Repeat this for each string and then go back through them again
to make final adjustments if required.
To exit the tuner function press the tuner button.
Alternatively remove the input jack and replace.
(You will be returned to the channel and sound settings prior to tuning.)