Crown XTi 1000, Service Manual

Page: 164 / 167

Tech Note
Crown Technical Support
PO Box 1000 Elkhart IN 46515
Ph 800-342-6939/574-294-8200
Fax 574-294-8301
Page 3 of 3
Issue Date:
March 26, 2007
Ref. No: Tech Note #184 Rev. A
Subject: Discharge resistor modification procedure for all XTi, DSi, and CDi models.
BEFORE APPLYING POWER TO THIS UNIT, IT MUST PASS A HIPOT TEST FOR
SAFETY PURPOSES.
HIpot Test voltage and connections
:
Application of Test Voltage HIpot Test
Voltage
Test Time
(Dwell Time)
High Limit (mA)
Basic Insulation
(primary (H and N) to ground)
1500 VAC or
2120VDC
60 seconds 9(mA)
Set-up the Unit Under Test (UUT) as described below:
•
Attach the High Voltage wire (HV) to both prongs coming from the power cord
from the Unit Under Test.
•
Attach the RETURN wire to the ground prong on the power cord from the Unit
Under Test.
•
Turn the unit under test power button to the on position.
Note: When testing with AC Hypot: If the ramp time is not long enough to charge the Y2 capacitors
before the actual Hypot test starts, the unit will fail the test because it sees the charging of the caps as
leakage and give a false result. If this happens, either lengthen the ramp time or use the VDC value
to verify the amp was assembled safely.
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