Yamaha PM4000 Owner's Manual (image) - Page 103

Installation of Optional Input, Transformers

Get Yamaha PM4000 PDF manuals and user guides View all Yamaha PM4000 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 103 highlights

6.16 Installation of Optional Input Transformers The PM4000 standard input module is equipped with a balanced, differential input preamplifier for the XLR connector. That preamp, along with some circuitry for the resistive attenuation pads, is located on a small printed circuit board that "piggy back" mounts to the module's main circuit board. Refer to Figure 6-16A. An optional transformer balancing option may be installed by a Yamaha PM4000 dealer or a qualified electronic service technician. The modification kit contains a replacement circuit board for the original differential preamplifier, and a separate input transformer. In order to install the kit, the following steps must be performed. 1. Shut off the power to the console. 2. Remove the Monaural (Stereo) input modules to be connected to input transformers. 3. Install the transformer onto the included fitting with the nut as shown in Figure 6-16B. 4. Being careful with the wiring, unfasten Angle H of the module by removing the two small flat head screws and, the two small bind screws. 5. From the inside of Angle H, insert the two small M3 screws provided, and attach the transformer fitting. (Figure 6-16C) 6. Reset Angle H to its original position. 7. Pass all the wiring through the slit in Angle R. 8. Solder the transformer wiring to the new input transformer board. (Figure 6-16D) 9. Remove the present input transformer board, and replace with the new transformer board. 10. Reinstall the input module into the console mainframe. The above completes the procedures for installation of an input transformer. Check the Fader and PAD signals to verify the installation. For a Stereo input module, up to 2 input transformers can be installed. * Be careful that the wiring does not protrude from the module. Damage could result when the module is extracted. Figure 6-16. Optional Input Transformer Installation Page 6-17

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
6.16 Installation of Optional Input
Transformers
The PM4000 standard input module is
equipped with a balanced, differential input
preamplifier for the XLR connector. That preamp,
along with some circuitry for the resistive attenu-
ation pads, is located on a small printed circuit
board that “piggy back” mounts to the module’s
main circuit board. Refer to Figure 6-16A.
An optional transformer balancing option may
be installed by a Yamaha PM4000 dealer or a
qualified electronic service technician. The modi-
fication kit contains a replacement circuit board
for the original differential preamplifier, and a
separate input transformer. In order to install the
kit, the following steps must be performed.
1.
Shut off the power to the console.
2.
Remove the Monaural (Stereo) input modules
to be connected to input transformers.
3.
Install the transformer onto the included
fitting with the nut as shown in Figure 6-16B.
4.
Being careful with the wiring, unfasten Angle
H of the module by removing the two small
flat head screws and, the two small bind
screws.
5.
From the inside of Angle H, insert the two
small M3 screws provided, and attach the
transformer fitting. (Figure 6-16C)
6.
Reset Angle H to its original position.
7.
Pass all the wiring through the slit in Angle
R.
8.
Solder the transformer wiring to the new
input transformer board. (Figure 6-16D)
9.
Remove the present input transformer board,
and replace with the new transformer board.
10. Reinstall the input module into the console
mainframe.
The above completes the procedures for installa-
tion of an input transformer. Check the Fader and
PAD signals to verify the installation. For a
Stereo input module, up to 2 input transformers
can be installed.
*
Be careful that the wiring does not protrude
from the module. Damage could result when
the module is extracted.
Figure 6-16. Optional Input Transformer Installation
Page 6-17