VocoPro SUB-1200 instruction manual Troubleshooting, Problems, Cause, Solutions

Troubleshooting

PROBLEMS	CAUSE	SOLUTIONS
Humming or buzzing noise.	You may have a ground loop	Try using a cheater plug. Do NOT ground
	problem.	the grounding tab on the cheater plug!
		That would defeat the purpose of the
		cheater plug for this application.
	There may be a problem with	Disconnect all interconnect cables from
	other external equipment.	the Sub-1200 and any external
		equipment. If hum goes away when
		interconnects are disconnected, hum is
		coming from the rest of your equipment.
		Add them back one piece at a time. The
		one that causes the system to hum is the
		source of the hum.
No output from the	AC power is not making it to	Check that the power cord is plugged in
Sub-1200 (the LED does	the Sub-1200.	securely at both ends and make sure
not light up).		that the power outlet the Sub-1200 is
		plugged into is functioning properly.
	The amplifier’s fuse is blown.	Unplug the power cord and remove the
		fuse holder with a screwdriver and check
		the fuse (located just above the power
		plug). If the fuse is blown, replace. If the
		fuse blows again, the output transistors
		are probably damaged. At that point, it is
		recommended to email or call technical
		support for authorization to send the
		Sub-1200 back for service.
Bass response sounds	The Sub-1200 and main	Place the ‘phase’ switch in its alternate
"weak" or "unstable".	speakers are out of phase.	position (0-180).
Excessive "rumbling"	The ‘crossover’ is set too low.	Adjust the ‘crossover’ to a higher setting
sound from Sub-1200		i.e. 80Hz or 120Hz.
output.
	The ‘level’ control is set too	Adjust the ‘level’ control to a lower
	high.	setting.
	The external amplifier’s built-in	Adjust the external amplifiers crossover,
	crossover, EQ or tone settings	EQ or tone settings
	are not balanced correctly.

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