Carver ZR500 - Manual (Page 8)

8
NOTE: Resetting any of the jumpers on the input card requires that you remove the top
cover. This operation should be performed by a qualified technician only! Always
disconnect the AC Mains when performing this operation.
To access the internal jumpers, remove the top cover of the amplifier. Locate the input
board as shown below.
JP101 and JP102 are 6 pin headers that are used to change the
polarity of the balanced input jacks. By default, pin 2 is hot.
Changing both jumpers to the opposite position will make pin 3
hot on that channel. NOTE: Both jumpers on either header
MUST be on the same side. The illustration below shows how the jumpers are configured to
set either Pin 2 or Pin 3 as the “positive” or “hot” pin on the XLR
connector.
JP103 and JP104 are 6 pin headers that are used to adjust the
amplifier’s input sensitivity for a wide variety of source levels.
Each channel can be set to any one of four positions: NOTE:
With no jumper connected, the input sensitivity defaults to
0.775Vrms.
See the illustration below to configure a specific input sensitivity.
The Photo above will show the location of the jumpers on the
input board.
0.316Vrms / -10dBV = Full Output
(Commonly seen in consumer devices with low voltage unbalanced outputs)
0.775Vrms / 0dBu = Full Output
(Most common line-level calibration)
1.23Vrms / +4dBu = Full Output
(Commonly seen in professional audio products with balanced outputs)
2.45Vrms / +10dBu = Full Output
(Devices with large voltage swing, used to drive long line-level paths)
INTERNAL JUMPER SETTINGS
XLR Pin 2 Hot XLR Pin 3 Hot
0.775V 0.316V 1.23V 2.45V
JP101 or JP102 - Input Polarity
JP103 or JP104 - Sensitivity Adjust
INPUT POLARITY
INPUT SENSITIVITY