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10

Driver Troubleshooting

The Remote Monitoring System (RMS) is the best method
to query the status of the drivers in a system before and
during the performance. RMS monitors peak power,
peak voltage, and average voltage (VU) for each amplifier
channel, allowing immediate detection and muting for
drivers with open or shorted voice coils, with minimal
disruption to the system. Contact Meyer Sound for more
information about RMS.

In the absence of RMS, several methods can be employed
to obtain information about the state of the drivers.

Driver Troubleshooting with TPL

The TPL LEDs can indicate serious driver problems, if
interpreted correctly. If one MSL-6 in a system exhibits
substantially more TPL activity than others receiving
the same audio signal, then one of the drivers corre-
sponding to the excessively active LED may have a short
circuit. This is a potentially dangerous condition for the
electronics; shut the MSL-6 down immediately.

The TPL circuit does not activate if there is no power
dissipation in the driver, regardless of the input signal
level. Therefore, if all MSL-6s in a system receiving the
same audio signal exhibit TPL activity except one, then
that unit may have an open voice coil; disconnect it and
contact Meyer Sound for repair information.

Removal, Inspection, and Replacement

To determine whether a low or high frequency driver is
functioning properly, or replace a damaged driver, contact
Meyer Sound to obtain the 

Low Driver Inspection and

Evaluation Procedure for Self-Powered Series Products

(part # 17.010.120.01) or the 

High Driver Inspection

and Evaluation Procedure for Self-Powered Series
Products 

(part # 17.010.120.02).  These documents are

accurate for inspection and verification but have yet to
be updated for the different driver removal procedure
for the MSL-6.

The MSL-6 has two rear hatch covers that must be re-
moved to access the high and low drivers. Remove the
screws for either hatch with a Phillips screwdriver. The
hatch is sealed with a rubber gasket so it must be pulled
off with moderate force.

Use a 

7

/

16

” open-end wrench to remove the nuts that

secure the high driver to the horn. Hold the driver as the
final nut is removed to prevent it from falling. Twist the
driver sideways and up/down to remove it from the
back of the cabinet.

Use a 

3

/

16

” hex wrench to remove the nuts that mount

the low driver. Support the driver as the last nut is
removed to prevent it from falling. Twist the driver
sideways and up/down to remove it from the back of
the cabinet.

Verifying Polarity

Incorrect driver polarity impairs system performance
and may damage the drivers. All Meyer Sound loud-
speakers are shipped with the drivers in correct align-
ment. However, if the driver or circuit wiring has been
removed or disassembled in any loudspeaker in a system
for any reason, check the polarity between adjacent
loudspeakers and between drivers in the same cabinet.

We recommend that SIM System II be used to check
polarity but a real-time frequency analyzer with one-
third octave resolution is adequate.

!

  Since polarity reversal causes excessive driver

excursion at high source levels, use moderate levels
when conducting these tests.

Driver Polarity in the Same Loudspeaker

Use the following test procedure to verify polarity be-
tween high frequency horn drivers:

1. Place a monitoring microphone 5 ft from the grill

frame, 8.5” below the top of the speaker, at the mid-
point of the center horn (center-line of cabinet).

2. Connect a signal source to the loudspeaker and

note the frequency response.

The polarity of the high drivers is correct if the fre-
quency response is 

±

3 dB 1 – 4 kHz. Polarity reversal for

the center or outer horns is indicated by 12 – 15 dB
cancellation in the same region. Check the wiring to the
high frequency drivers and to the MP-4 and correct the
problem.

Use the following test to verify polarity between low
frequency drivers:

1. Place a monitoring microphone 5 ft from the grill

frame, 28” below the top of the cabinet, at the mid-
point between low drivers (center-line of cabinet).

2. Connect a signal source to the loudspeaker and

note the frequency response.

The polarity of the low drivers is correct if the frequency
response is 

±

3 dB 125 – 500 Hz. Polarity reversal for one

of the low drivers is indicated by 12 – 15 dB cancellation
in the same region. Check the wiring to the low drivers
and to the MP-4 and correct the problem.

Содержание MSL-6

Страница 1: ...Operating Instructions MSL 6 Copyright 1997 Meyer Sound Laboratories Inc All rights reserved Part 05 053 026 01 Rev A Self Powered Loudspeaker System...

Страница 2: ...C Nonoperating temp 40 C or 75 C Humidity to 95 at 35 C Operating altitude to 4600 m 15 000 ft Nonoperating altitude to 6300 m 25 000 ft Environmental Specifications for Meyer Sound Electronics Produ...

Страница 3: ...ower is applied to the MSL 6 the Intelligent AC supply automatically selects the correct operating voltage allowing the MSL 6 to be used internationally withoutmanuallysettingvoltageswitches TheIntell...

Страница 4: ...increase in cables which is used to select cables that conform to electrical code standards It is also used to select the rating for slow reacting thermal breakers The maximum burst RMS current is the...

Страница 5: ...nd chassis Pins 2 and 3 carry the input as a differential signal their polarity can be reversed with the input polarity switch on the user panel If the switch is in the up position pin 2 is hot relati...

Страница 6: ...igh limiter engages limiting the center as well as the outer two horns The high and low limiters function independently and do not affect the signal when the LEDs are inactive The MSL 6 performs withi...

Страница 7: ...rolonged period in hot temperatures or direct sunlight accumulation of dust along the cooling path driver failure The secondary fans turn off when the temperature decreases to 68 C TROUBLESHOOTING NOT...

Страница 8: ...Mid Hi DS 2 and Sub outputs channels 1 and 2 only each have their own gain control and mute switch POLARITY NOTE The polarity for Meyer self powered speakers may be reversed using the input polarity...

Страница 9: ...or The system from the previous example can be supple mented with a row of four DS 2Ps or PSW 2s sus pended below the lower MSL 6 array to reinforce the low frequencies The MSL 4s are hung below the D...

Страница 10: ...s that secure the high driver to the horn Hold the driver as the final nut is removed to prevent it from falling Twist the driver sideways and up down to remove it from the back of the cabinet Use a 3...

Страница 11: ...e and overall level 4 Apply the same signal to the second speaker with the first speaker still connected The polarity is correct if the frequency response remains constant with a significant increase...

Страница 12: ...pport Channel 11 Ga Steel Side Braces Resonance Damping Foam Bracing Fastened With 3 8 16 Grade B Steel Flathead Socket Screws 32 Total Pivoting Lift Ring 1500 lb Load Capacity 5 1 Safety Factor 12 pl...

Страница 13: ...en nur von ausgebildetem Kundenienstpersonal durchgef hrt werden Para reducir el riesgo de descarga el ctrica desconecte de la red el altoparlante antes de instalar el cable de se alizaci ndeinterfazd...

Страница 14: ...the optional Remote Monitoring System RMS panel ATENCI N ACCESO INTERNO SOLO AUTORIZADO A PERSONAL T CNICO CALIFICADO ACHTUNG GEH USE NICHT FFNEN WARTUNG UND REPARATUR NUR DURCH ELEKTROFACHKR FTE ATTE...

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