Service Manual Instruction Manual

ManualsBrandsToa ManualsReceivers and AmplifiersW-912A

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

EQUALIZER

OUTPUT FUSE COMPRESSOR

INPUT 4 INPUT 5 INPUT 6 MASTER

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.

Summary of content (16 pages)

PAGE 1
SERVICE MANUAL NEW 900 SERIES IN-WALL MIXER POWER AMPLIFIERS W-906A W-912A 900 SERIES WALL AMPLIFIER POWER POWER PEAK AC FUSE OUTPUT FUSE ON OFF 250V 3A COMPRESSOR 250V 6A OFF EQUALIZER OUT HIGH PASS IN 63 125 OFF 250 500 ON 1k 2k ON 8k 16k 12 12 6 6 0 0 6 6 12 12 63 INPUT 1 MAX LOW PASS OFF 4k 125 250 500 INPUT 2 1k 2k 4k INPUT 3 8k 16k INPUT 4 INPUT 5 INPUT 6 MASTER TABLE OF CONTENTS 1. IMPORTANT SAFETY INSTRUCTIONS ...... 2 8. SERVICING .................
PAGE 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.
PAGE 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.
PAGE 4
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.
PAGE 5
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. ATTENTION 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. 3.
PAGE 6
5. NOMENCLATURE AND FUNCTIONS [Front] 900 SERIES 11 10 12 13 1 15 2 4 POWER Equalizer Section Equalizer Section WALL AMPLIFIER 6 5 14 PEAK EQUALIZER OUT POWER AC FUSE OUTPUT FUSE ON OFF 250V 3A HIGH PASS IN 63 125 OFF 250 500 ON 1k 2k 16k 12 6 0 0 6 6 12 INPUT 1 16 12 250 500 INPUT 2 1k 2k 4k INPUT 3 125 250 500 1k 2k 4k ON 8k 16k 12 12 6 6 8k 0 0 6 6 12 12 16k INPUT 4 INPUT 5 INPUT 6 MASTER 63 125 3 1.
PAGE 7
[Front] (viewed with the front cover removed) 18 17 19 20 POWER AC FUSE OUTPUT FUSE ON OFF 250V 3A COMPRESSOR 250V 6A OFF EQUALIZER OUT HIGH PASS IN 63 125 OFF 250 500 ON 1k 2k ON 8k 16k 12 6 6 0 0 6 6 12 12 63 INPUT 1 MAX LOW PASS OFF 4k 12 125 250 500 INPUT 2 1k 2k 4k 8k INPUT 3 16k INPUT 4 INPUT 5 INPUT 6 MASTER 21 22 23 Junction Box 24 17. AC power cable Connects to power source. 18. Speaker output terminals Connect to speakers. 19.
PAGE 8
6. INSTALLATION PRECAUTIONS • The unit is designed for wall mounting. To secure ventilation, never install it in a horizontal or face-up orientation. Correct orientation Wall Floor • To provide enough space for operation and ventilation, never place objects in areas shown in the figures below. Wall Over 30 cm (11.81”) W-906A/912A Over 30 cm (11.81”) Front Over 1 m (39.37”) Over 15 cm (5.91”) W-906A/912A Over 30 cm (11.81”) Over 30 cm (11.
PAGE 9
7. INSTALLATION AND CONNECTION Installing this amplifier requires the optional back box, which is Model BX-9F for flush mounting in any 4 inch wall and Model BX-9S for surface mounting. Fix the back box first before installing the amplifier. 7.1. Installation Procedures Step 1. Attach the supplied hinges to the back box using the 6 supplied M3 x 6 machine screws. Step 2. Fix the amplifier to the back box by inserting the amplifier bolts into the hinges as illustrated.
PAGE 10
Step 5. Connect the speaker cable. Connect the speaker cable to the speaker output terminals on the junction box. Amplifier output impedance may be selected at the output terminals on the front panel. Speaker output terminals Class 2 Wiring Speaker cable [Speaker cable treatment] Strip 10 mm (0.39") of insulative jacket from the cable end, as shown in the figure at right. WARNING 10 mm (0.39”) The terminals marked with the symbol are hazardous live.
PAGE 11
Note It is highly recommended that the low-cut switch be placed in the CUT position to cut off unnecessary low frequency. This is because the built-in transformer cannot produce low frequencies though the unit has flat response even in lowfrequency range. CUT LOW-CUT FLAT Place the Low-cut switch in "CUT" position • When connecting speakers to the 4 Ω output (UNBALANCED DIRECT OUTPUT), connect as illustrated below. 4Ω SPEAKER OUTPUT OT 70V 25V 8Ω COM IN + 4Ω – Remove the jumper strip. Step 8.
PAGE 12
7.2. Input Expander The optional expanding kit WE-2 is necessary to increase the number of input. Up to two inputs may be added by loading the expanding kit in the user's space. For details, refer to the instruction manual of the kit. Expanding kit WE-2 Modules Note When the temperature of heat sink exceeds 105°C (221°F), the protection circuit disconnect the output. Operation automatically returns to normal when the temperature decreases.
PAGE 13
9. OPERATION Be sure to complete all connections before operation. 9.1. Basic Operation Procedure Step 1. Press the power switch to turn on the power. The power indicator lights. The amplifier comes into operation about 5 seconds after the power has been switched on. Step 2. Adjust the individual input and master volume controls for the optimum level. Turn the knob clockwise to increase the output level and counterclockwise to decrease it. Sound quality is downgraded when the Peak Indicator remains lit.
PAGE 14
10. VOLUME CONTROL COVER ATTACHMENT To protect the input volume control from accidental operation, it is recommended to replace the control knob with the supplied volume control cover. Step 1. After adjusting the input volume control, remove its knob. Step 2. Attach the supplied volume control cover in place of the knob. 2 Volume control cover YA-910 (accessory) 1 Input volume control knob Note The unit comes with 3 volume control covers as standard accessories.
PAGE 15
12. SPECIFICATIONS Model No. Type Output Power Power Bandwidth Frequency Response Total Harmonic Distortion Inputs Input Sensitivity/Impedance Outputs Output Regulation (1 kHz) Signal to Noise Ratio (Band Pass: 20 Hz – 20 kHz) Compression Equalization Filters Controls Indicators Protection Connectors Power Source Power Consumption (1/3 Non-Clip Maximum Power) Color Dimensions Weight Other Features W-906A W-912A Wall mounting 6-channel mixer power amplifier 60 W RMS 120 W RMS (D): 20 Hz – 20 kHz, 0.
PAGE 16
• Accessories Volume control cover YA-910 ................... 3 Key (for door) ............................................ 2 Lift-off hinge (receptacle) .......................... 2 Machine screw M4 x 10* ........................... 5 Machine screw M3 x 6 .............................. 6 Machine screw M3 x 10 ............................ 4 Flange nut for M3 ...................................... 4 Tapping screw 3 x 8 .................................. 4 Inch screw .........................................