JBL A6000GTi, Service Manual, Page: 23 / 62

137159-1 Rev. 1 A6000GTi Service Manual

2003 Crown Audio, Inc.
Maintenance 4-4
4.3.2. Power Supply Discharge
Before any connectors and PWAs (Printed Wire Assemblies, or circuit boards) are
removed, the Power Supplies need to be discharged. Follow these simple steps.
1. Make sure the amplifier is disconnected from the +12Volt Power Source.
2. Locate the 6-Wire power cable (See Fig 4.5). The wire colors are red-black-blue-red-
black-blue.
3. Disconnect the cable.
4. Connect a 600 Ohm 10 watt resistor as shown in Figure 4.4. Be careful not to touch
the leads, as voltages in excess of

100V could be present.
5. Wait 30 seconds before removing the resistor.
Caution: The 10-watt
resistor will become
Hot as the power supplies
discharge.
Figure 4.4 Power Cable and Discharge Resistor
Caution: After the 6-wire power cable is unplugged. Do not plug it back
in until the rails have been discharged. Failure to do so can result in
component failure.
Figure 4.5 6-Wire Power Cable Location
6-Wire Power
Cable
Input
Housing