Bose Personalized Amplification System Посібник з усунення несправностей - Сторінка 33
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PS1 Power Stand Test Cables
Note: In order to be able to properly test the PS1 Power Stand, you will need to make up a few
test cables.
1. Amplifier Output Test Cable:
Parts needed:
®
1- Neutrik
NL4FX Speakon
4 - Dual banana jacks
2 - 10k ohm, 1/4 Watt resistors
16 or 18 AWG twisted pair wire, 6 feet
18 AWG twisted pair wire, 2 feet
This cable is used to connect the Amp 1 OUT, Amp 2 OUT or Bass/Amp3 OUT jacks to the load
resistors used in the test procedures. The connector used is a Neutrik NL4FX Speakon X-Line /
4 Pole type. This connector has 4 terminals labeled 1+, 1-, 2+ and 2-. Terminals 1+ and 1- are
used to connect to the load resistors. Use 18 or 16 AWG wire for these terminals. Use twisted
pair wires to avoid inducing noise into the cable during use.
The 2+ and 2- terminals will be used to sense the loads connected to the Speakon connector
when used with the Bass/Amp3 OUT jack. The load on this jack automatically sensed in order to
properly tailor the EQ and output level for the connection of one or two bass modules. It does
this by sensing the resistive value across terminals 2+ and 2-. The bass modules have a 10k
ohm resistor across these terminals. When only one bass module is connected, the PS1 sees
the 10k resistance and sets the EQ and output level accordingly. When two bass modules are
connected, it sees 5k and sets the EQ and output level accordingly. For the test cable, you will
use 18 AWG twisted pair wire to a dual banana jack.
It is also useful to have 3 spare banana jacks, one with a short across it and 2 with a 10k Ohm,
1/4 Watt resistor each to simulate a bass module connected to the terminals. The Amp 1 OUT
and Amp 2 OUT jacks do not sense this load.
1-
2+
18AWG twisted pair wire
APPENDIX
®
X-Line/4 Pole connector.
16-18AWG twisted pair wire
1+
Neutrik Speakon
4 pole connector
(back shown)
2-
GND
Dual banana jack
Bass module
sensing output
Amplifier Output Test Cable Wiring Diagram
Dual banana jack
GND
Amplifier output
to load resistor
33