Chapter 8: INSTALLATION AND SETTING PROCEDURES (HARDWARE)
5. VP-3154, VP-3304 AND VP-3504 POWEr AmPlIfIErS
8-41
5.2. Ground Lifting
Hum noise may be generated by a ground loop accidentally created through the PA link’s audio input.
In this case, the ground loop can be cut by setting the ground lift, which can be performed on the pc board of
PA link/BGm input board.
Step 1.
remove the top panel. (See Step 1 on
.)
Step 2.
Take out the PA link/BGm input board to be set for ground lift.
Remove 2 screws at the corresponding channel’s board on the amplifier’s rear while holding the internal
Pc board as show below.
The figure below shows an example of removing channel 1’s board.
PA link/BGM input board
PA link/BGM input board
Step 3.
cut the jumper J2 on the pc board.
Step 4.
replace the PA link/BGm input board and the top panel in the reverse procedures of removal.
Amplifier’s rear
BGM input
PA link/BGM input board
J2 (Ground lifting)
Cut to make ground lifting.
Viewed from the parts mounting side
Summary of Contents for VP-2241
Page 12: ...Chapter 1 Note...
Page 17: ...Chapter 2 ProduCt desCriPtioNs...
Page 41: ...3 1 Chapter 3 system oPeratioN outliNe...
Page 56: ...Chapter 4 FuNCtioNs...
Page 73: ...Chapter 5 oPeratioN...
Page 112: ...Chapter 6 FloWCHart From system setuP to oPeratioN...
Page 116: ...Chapter 7 PC soFtWare oFFliNe settiNGs...
Page 179: ...Chapter 8 iNstallatioN aNd settiNG ProCedures HardWare...
Page 223: ...Chapter 9 CoNNeCtioNs...
Page 266: ...Chapter 10 PC oNliNe CHeCKs aNd adJustmeNts...
Page 282: ...Chapter 11 otHer PC soFtWare FuNCtioNs...
Page 292: ...Chapter 12 aPPeNdiX...
Page 298: ...Chapter 13 sPeCiFiCatioNs...
Page 328: ...url http www toa jp 201409...