Toa W-912A Service Manual

SERVICE MANUAL
NEW 900 SERIES
IN-WALL MIXER POWER AMPLIFIERS
W-906A W-912A
INPUT 1
POWER
250V 3A 250V 6A
OFF
OFF MAX
INPUT 2 INPUT 3
AC FUSE
OFF ON
LOW PASS
OFF ON
HIGH PASS
OUT
63 125 250 500 1k 2k 4k 8k 16k
63 125 250 500 1k 2k 4k 8k 16k
IN
EQUALIZER
OUTPUT FUSE COMPRESSOR
INPUT 4 INPUT 5 INPUT 6 MASTER
12
6
0
6
12
12
6
0
6
12
900 SERIES
WALL AMPLIFIER
POWER PEAK
1. IMPORTANT SAFETY INSTRUCTIONS ...... 2
2. SAFETY PRECAUTIONS ............................. 3
3. GENERAL DESCRIPTION ........................... 5
4. FEATURES ................................................... 5
5. NOMENCLATURE AND FUNCTIONS
Front .............................................................. 6
Front (viewed with the front cover removed)
... 7
6. INSTALLATION PRECAUTIONS ................. 8
7. INSTALLATION AND CONNECTION .......... 9
8. SERVICING ................................................ 12
9. OPERATION .............................................. 13
10.
VOLUME CONTROL COVER ATTACHMENT
.. 14
11. OUTPUT EQ CHARACTERISTIC ............. 14
12. SPECIFICATIONS ..................................... 15
Accessories ................................................ 16
Optional products ....................................... 16
13. BLOCK DIAGRAM .................................... 16
TABLE OF CONTENTS
CAUTION
These servicing instructions are for use by qualified service personnel only. To reduce the risk of electric shock, do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so.
2
1. IMPORTANT SAFETY INSTRUCTIONS
• Read these instructions.
• Keep these instructions.
• Heed all warnings.
• Follow all instructions.
• Do not use this apparatus near water.
• Clean only with dry cloth.
• Do not block any ventilation openings. Install in accordance with the manufacturer's instructions.
• Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
• Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
• Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
• Only use attachments/accessories specified by the manufacturer.
• Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
• Unplug this apparatus during lightning storms or when unused for long periods of time.
• Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
3
2. SAFETY PRECAUTIONS
• Before installation or use, be sure to carefully read all the instructions in this section for correct and safe operation.
• Be sure to follow all the precautionary instructions in this section, which contain important warnings and/or cautions regarding safety.
• After reading, keep this manual handy for future reference.
Safety Symbol and Message Conventions
Safety symbols and messages described below are used in this manual to prevent bodily injury and property damage which could result from mishandling. Before operating your product, read this manual first and understand the safety symbols and messages so you are thoroughly aware of the potential safety hazards.
When Installing the Unit
• Apparatus shall not be exposed to dripping or splashing and no objects filled with liquids, such as vases, shall be placed on the apparatus.
• Use the unit only with the voltage specified on the unit. Using a voltage higher than that which is specified may result in fire or electric shock.
• Do not cut, kink, otherwise damage nor modify the power supply cord. In addition, avoid using the power cord in close proximity to heaters, and never place heavy objects -- including the unit itself -- on the power cord, as doing so may result in fire or electric shock.
• Be sure to attach the front cover after connection completion. Because the voltage of up to 120 V is applied to internal terminals, never touch these terminals to avoid electric shock.
• External wiring connected to the terminals marked with requires installation by an instructed person.
• The apparatus shall be connected to a mains socket outlet with a protective earthing connection.
• The socket-outlet shall be installed near the equipment and the plug shall be easily accessible.
• Install the unit only in a location that can structurally support the weight of the unit and the back box. Doing otherwise may result in the unit falling down and causing personal injury and/or property damage.
• Do not use other methods than specified to mount the unit and back box. Extreme force is applied to the unit and the unit could fall off, possibly resulting in personal injuries.
• Use nuts and bolts that are appropriate for the wall's structure and composition. Failure to do so may cause the unit to fall, resulting in material damage and possible personal injury.
• Tighten each nut and bolt securely. Ensure that the unit has no loose joints after installation to prevent accidents that could result in personal injury.
• Use the specified mounting back box in combination. Doing otherwise may cause the unit or component to fall off, resulting in personal injury.
• Do not mount the unit in locations exposed to constant vibration. The hinges can be damaged by excessive vibration, potentially causing the unit to fall, which could result in personal injury.
• Avoid installing the unit in locations close to the seashore or in indoor swimming facilities that are not well ventilated. In such locations, the unit may be vulnerable to corrosion, eventually allowing itself to fall resulting in personal injury.
Indicates a potentially hazardous situation which, if mishandled, could result in death or serious personal injury.
WARNING
The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operation and maintenance (servicing) instruction in the literature accompanying the appliance.
An all-pole mains switch with a contact separation of at least 3 mm in each pole shall be incorporated in the electrical installation of the building.
4
When Installing the Unit
• Never plug in nor remove the power supply plug with wet hands, as doing so may cause electric shock.
• When unplugging the power supply cord, be sure to grasp the power supply plug; never pull on the cord itself. Operating the unit with a damaged power supply cord may cause a fire or electric shock.
• Do not block the ventilation slots in the unit's cover. Doing so may cause heat to build up inside the unit and result in fire.
• Avoid installing the unit in humid or dusty locations, in locations exposed to the direct sunlight, near the heaters, or in locations generating sooty smoke or steam as doing otherwise may result in fire or electric shock.
• To avoid electric shocks, be sure to unplug the unit's power supply cord when connecting speakers.
• When unpacking or moving the unit, be sure to handle it with two or more persons. Falling or dropping the unit may cause personal injury and/or property damage.
When the Unit is in Use
• Do not place objects on the unit as this may cause it to fall or break which may result in personal injury and/or property damage. In addition, the object itself may fall off and cause injury and/or damage.
• Make sure that the volume control is set to minimum position before power is switched on. Loud noise produced at high volume when power is switched on can impair hearing.
• Do not operate the unit for an extended period of time with the sound distorting. This is an indication of a malfunction, which in turn can cause heat to generate and result in a fire.
• If dust accumulates on the power supply plug or in the wall AC outlet, a fire may result. Clean it periodically. In addition, insert the plug in the wall outlet securely.
• Switch off the power, and unplug the power supply plug from the AC outlet for safety purposes when cleaning or leaving the unit unused for 10 days or more. Doing otherwise may cause a fire or electric shock.
• Do not stand or sit on, nor hang down from the unit as this may cause it to fall down or drop, resulting in personal injury and/or property damage.
Indicates a potentially hazardous situation which, if mishandled, could result in moderate or minor personal injury, and/or property damage.
CAUTION
When the Unit is in Use
• Should the following irregularity be found during use, immediately switch off the power, disconnect the power supply plug from the AC outlet and contact your nearest TOA dealer. Make no further attempt to operate the unit in this condition as this may cause fire or electric shock.
· If you detect smoke or a strange smell coming from the unit
· If water or any metallic object gets into the unit
· If the unit falls, or the unit case breaks
· If the power supply cord is damaged (exposure of the core, disconnection, etc.)
· If it is malfunctioning (no tone sounds.)
• To prevent a fire or electric shock, never open nor remove the unit front cover as there are high voltage components inside the unit. Refer all servicing to your nearest TOA dealer.
• Do not place cups, bowls, or other containers of liquid or metallic objects on top of the unit. If they accidentally spill into the unit, this may cause a fire or electric shock.
• Do not insert nor drop metallic objects or flammable materials in the ventilation slots of the unit's cover, as this may result in fire or electric shock.
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3. GENERAL DESCRIPTION
The TOA W-906A and W-912A In-Wall Mixer Power Amplifiers control and mix up to six independent input signals plus two inputs with use of WE-2 Expanding kit. The W-906A delivers up to 60 W of output power and the W-912A 120 W. Optional accessory modules are available for use with the W-906A and W-912A to provide versatility for a wide range of operating applications. Edge connectors at the bottom of the front panel permit the selection of the TOA plug-in modules. (Please contact your local TOA dealer for details on TOA plug-in modules.) The W-906A and W-912A have a built-in one-octave graphic equalizer with 9 bands to tailor sound system frequency response to room acoustics, reducing feed-back tendencies and improving intelligibility. A built-in compressor circuit is provided to protect the output level from distortion as a result of excessive input and keeps it constant. Compressor's threshold level can be adjusted. The speaker output terminals are designed to match 25 or 70 V line, or 4 or 8 Ω speaker systems. User’s space (blank) is provided for loading the WE-2 Expanding kit (optional), enabling the number of inputs to be increased by two.
Protection against tampering is assured by means of a key-locked hinged door. The
W-906A and W-912A can be mounted in any four-inch wall with of the BX-9F
Flush-mounting (in-wall) back
box
. On-wall mounting is also possible with the BX-9S
Surface-mounting (on-wall) back box
.
4. FEATURES
• 6-channel mixer power amplifier
• Expandable to 8-input
• Output power: 120 W for W-912A, 60 W for W-906A
• Wide frequency response: 30 Hz to 20 kHz ±1dB
• Low distortion and noise
• Excellent output regulation
• Built-in one-octave equalizer
• Built-in compressor
• Self-protection circuitry design
• Separate output terminals: 4 and 8 Ω, 25 and 70 V
• Extra space for customizing
• LED peak indicator
• Full range of plug-in modules
• Flush and surface mounting
L'appareil ne doit pas être exposé aux éclaboussures ou écoulements et tous objets remplis de liquide, tels que vases, ne doivent pas être sur l’appareil.
ATTENTION
The lighting flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.
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