Nomenclature and functions, Front – Toa W-912A Service Manual User Manual
Page 6
6
5. NOMENCLATURE AND FUNCTIONS
[Front]
1. Power switch [POWER]
Power is switched on and off with each depression
of this switch.
2. Input volume controls [INPUT 1 – 6]
Adjust gain of input 1 – 6 respectively.
Adjust the input volume of each input channel.
Write the input source name on the enclosed
indication label, then attach it just below the
corresponding control.
3. Master volume controls [MASTER]
Adjusts overall gain of all input channels.
4. Blank panels
Cover the Module input ports (21) when shipped
from the factory.
When mounting a module, remove the blank panel
corresponding to the port.
5. Compressor control (limiter) [COMPRESSOR]
Setting the control switch to OFF position
bypasses the compressor circuit. As the control is
turned clockwise, the output level is limited
stronger.
6. Equalizer switch [EQUALIZER]
Place this switch in the IN position to activate an
equalizer.
7. High-pass filter switch [HIGH PASS]
Place this switch in the ON position to cut off
unnecessary low frequencies.
8. Low-pass filter switch [LOW PASS]
Place this switch in the ON position to cut off
unnecessary high frequencies.
9. Equalizer controls
9 band filters. 12 dB of boost and cut at each
center frequency.
10. Power indicator
Lights when power is switched on.
11. Peak indicator
Lights if input signals approach clipping level. If
steady lit, turn down the corresponding Input
volume control until the indicator flashes only
intermittently.
12. Output fuse [OUTPUT FUSE]
Protects against excessive current flow.
W-906A: 250 V, 6 A
W-912A: 250 V, 10 A
13. AC fuse [AC FUSE]
Protects against excessive current flow.
W-906A: 250 V, 3 A
W-912A: 250 V, 5 A
14. Blank panel (user's space)
The space of 103 (w) x 63 (h) x 95 (d) mm (4.06"
x 2.48" x 3.74") is provided.
An optional expanding kit (WE-2) may be loaded
in this space.
15. Equalizer security cover
Protects against inadvertent changes of the
equalizer controls set at proper level.
16. Key-locked door
Protects against tampering.
INPUT 1
POWER
ON
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
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
12
6
0
6
12
12
6
0
6
12
900 SERIES
WALL AMPLIFIER
POWER
PEAK
1
2
4
10
11
12
13
15
Equalizer Section
3
14
16
5
6
7
8
Equalizer Section
9