Yamaha PM4000 Owner's Manual (image) - Page 129

9.2 Meter Lamp Replacement The VU meters and meter-assign indicators are illuminated by LEDs which should not require replacement. 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 working properly in a sound system, it is necessary to have a clear understanding of the system block diagram. One should look for a "good" signal by patching around suspect equipment, modules or circuits. Suspected "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. "FAULT" CONDITION POSSIBLE CAUSE CORRECTION Input channel signals do not appear at Console is in SOLO mode, and an input Release master SOLO MODE switch to acthe Group, Stereo, Aux or Matrix outputs channel to which no signal is applied has tivate all channels which should be on. 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. Disengage the MASTER MUTE switch, or the affected input channel MUTE switch(es). 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. Disconnect the VCA/MUTE connector to check theory; if output is restored, check remote circuitry. Certain input channels or groups of channels, cannot be heard at Group, Stereo, Post-Fader Aux sends, or Matrix outputs. 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). Disengage VCA assign switch on the channel affected or raise the VCA Master Fader to a higher setting. 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. Disconnect the VCA/MUTE connector to check theory; if output is restored, check remote circuitry. Certain input channels or groups of channels cannot be heard at Group outputs, Group-to-Stereo outputs or Group to-Mtrx outputs. The affected input channels are assigned to a Group Fader which is set to minimum level (down), and the G›ST and G›MTRX feeds are post Group Fader. Raise the Group Fader setting to a higher level. Individual input channel cannot be heard Channel ON/off switch is off, or its PAD at the Group, Stereo, Aux or Matrix and GAIN controls are set so input sen- outputs. sitivity is too low. Turn On the channel. Set the PAD for a lower value and/or GAIN at a higher value. Channel INSERT switch is engaged, and a plug is connected to the channels INSERT IN jack, but no signal is applied to that plug. Disengage INSERT switch or check the signal at the INSERT IN jack A phantom powered condenser microphone or direct box is connected to the channel and is not receiving phantom power. Check to be sure channel and master 48V switches are on. There is no output, and no console func- Power is not reaching the PM4000. tions work at all. Verify that PW4000A is On and that its umbilical cables both are properly connected. Check fuses and AC mains voltage. Fuses are OK and power supply turns on, but console does not turn on. Power supply cables are misconnected Check cables and correct as required. (A to B and vice-versa) or not connected. Page 9-2