Meter Lamp Replacement; Where To Check If There Is No Output - Yamaha PM4000 Operating Manual

9.2 Meter Lamp Replacement

The VU meters and meter-assign indicators are
illuminated by LEDs which should not require replace-
ment. Contact your Yamaha dealer or service facility
should a meter illumination LED fail.
9.3 Where To Check If There Is No
Output
In general, when something appears not to be
"FAULT" CONDITION
Input channel signals do not appear at
the Group, Stereo, Aux or Matrix outputs
Certain input channels or groups of
channels, cannot be heard at Group,
Stereo, Post-Fader Aux sends, or Matrix
outputs.
Certain input channels or groups of
channels cannot be heard at Group out-
puts, Group-to-Stereo outputs or Group
to-Mtrx outputs.
Individual input channel cannot be heard
at the Group, Stereo, Aux or Matrix
outputs.
There is no output, and no console func-
tions work at all.
Fuses are OK and power supply turns
on, but console does not turn on.
working properly in a sound system, it is necessary to
have a clear understanding of the system block dia-
gram. One should look for a "good" signal by patching
around suspect equipment, modules or circuits. Sus-
pected "bad" cables can be replaced or swapped to see if
the problem follows the cable. These techniques should
be known to most experienced sound system operators.
In the case of the PM4000 console, however, there are a
number of apparent fault conditions, which the operator
may inadvertently create simply by setting controls in a
particular configuration, whereby no signal reaches the
output. The following chart depicts the most likely
errors you may encounter, and points out how to correct
the problem.
POSSIBLE CAUSE
Console is in SOLO mode, and an input
channel to which no signal is applied has
its CUE/SOLO switch engaged.
The affected input channel(s) have
MUTE assign switches engaged, and
the MASTER MUTE group to which the
channel(s) is assigned is set to mute
mode.
The affected input channel(s) have
MUTE assign switches engaged, and
the remote VCA/MUTE connection is
causing the MASTER MUTE group to be
engaged.
The affected input channel(s) have VCA
assign switches engaged, and the VCA
Master Fader to which the channel(s) is
assigned is set to minimum level (down).
The affected input channel(s) have VCA
assign switches engaged, and the
remote VCA/MUTE connection is
causing the VCA Master level to go to
minimum.
The affected input channels are as-
signed to a Group Fader which is set to
minimum level (down), and the G›ST and
G›MTRX feeds are post Group Fader.
Channel ON/off switch is off, or its PAD
and GAIN controls are set so input sen-
sitivity is too low.
Channel INSERT switch is engaged, and
a plug is connected to the channels IN-
SERT IN jack, but no signal is applied to
that plug.
A phantom powered condenser micro-
phone or direct box is connected to the
channel and is not receiving phantom
power.
Power is not reaching the PM4000.
Power supply cables are misconnected
(A to B and vice-versa) or not connected.
Page 9-2
CORRECTION
Release master SOLO MODE switch to ac-
tivate all channels which should be on.
Disengage the MASTER MUTE switch, or the
affected input channel MUTE switch(es).
Disconnect the VCA/MUTE connector to
check theory; if output is restored, check
remote circuitry.
Disengage VCA assign switch on the channel
affected or raise the VCA Master Fader to a
higher setting.
Disconnect the VCA/MUTE connector to
check theory; if output is restored, check
remote circuitry.
Raise the Group Fader setting to a higher
level.
Turn On the channel. Set the PAD for a lower
value and/or GAIN at a higher value.
Disengage INSERT switch or check the signal
at the INSERT IN jack
Check to be sure channel and master 48V
switches are on.
Verify that PW4000A is On and that its
umbilical cables both are properly connected.
Check fuses and AC mains voltage.
Check cables and correct as required.