JBL P12SW, E250P Leakage/Resistance Check, Critical Components, List of Safety Components

E250P/P12SW subwoofers

SAFETY INFORMATION

Warning

Any person performing service of this unit will be exposed to hazardous voltages and the risk of electric shock. It is assumed that any person who removes the amplifier from this cabinet has been properly trained in protecting against avoidable injury and shock. Therefore, any service procedures are to be performed by qualified service personal ONLY!

Caution

Early revisions of the unit did not have a power switch. Hazardous voltages are resent within the unit whenever it is plugged in.

Before amplifier is plugged in, be sure its rated voltage corresponds to the voltage of the AC power source to be used. Incorrect voltage could cause damage to the amplifier when the AC power cord is plugged in. Do not exceed rated voltage by more than 10%: operation below 90% of rated voltage will cause poor performance or may shut the unit off.

Leakage/Resistance Check

Before returning the unit to the customer, perform a leakage or resistance test as follows:

Leakage Current. Note there is no power switch on early revisions of this unit. When the power plug is plugged in, the unit is live. Connect the unit to its rated power source. Using an ammeter, measure the current between the neutral side of the AC supply and chassis ground of the unit under test. If leakage current exceeds 0.5mA, the unit is defective. Reverse the polarity of the AC supply and repeat.

Resistance. Measure the resistance from either side of the line cord to chassis ground, If it is less than 500k ohms, the unit is defective.

WARNING! DO NOT return the unit to the customer if it fails one of these tests until the problem is located and corrected.

Critical Components

All components identified with the IEC symbol in the parts list and schematic diagram designate components in which safety can be of special significance when replacing identified with. Use only the

replacement parts designated in the parts list or parts with the same rating of resistance, wattage or voltage.

List of Safety Components

Requiring Exact Replacements

Part Number/	Description
Designator
F1	Line Fuse Slo Blo 2.0A
093-105202-300	5x20mm
083-041802-009	250V UL approved SPT-2 or
	better with polarized plug, UL
	approved wired with the hot side
	to fused
	side. Use with factory
	replacement panel strain relief
	(70305) only.
PT1	Power Transformer.
	Use only factory
042-010053-003
	replacement.
BR1	Bridge diode. Use only
052-400080-000	factory replacement.
	3300uF 80V electrolytic
	filter caps. Be sure
	replacement part is at
C6,8	least the same working
	voltage and capacitance
034-330780-300	rating. Also the lead
	spacing is important.
	Incorrect spacing may
	cause premature failure
	due to internal cabinet
	pressure and vibration.
	Rear Amp Cover
063-531808-000	Use only factory
	replacement
Inductor	L1 - Use only factory
043-560200-000	replacement
Inductor	L2 - Use only factory
043-300101-000	replacement
Inductor	L3 - Use only factory
043-700101-000	replacement
Inductor	L4 - Use only factory
043-324300-000	replacement

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