JBL ES250P, Service Manual

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Yes/No Hi/Lo Line Nom. Unit Notes
Turn-off Transient 0.5 V-peak 0.8V @ Speaker Output AC Line cycled from ON to OFF
Efficiency
Efficiency 65 % 60
Test conducted at rated power
250W
Nominal Line voltage
Efficiency at 1/8 of rated power 48 % 45 Test conducted at 31.25 WRMS Nominal Line voltage-Rated impedance 4 Ohms
Off state input power 10 Watts 12 Nominal Line voltage RED LED
Stand-by Input Power 18 Watts 18 @ nom. line voltage
Maximum allowable input power under nominal
Input voltage and frequency, HOT or COLD
operation. LED GREEN no signal applied
Power Cons. @ rated power 406 Watts 416 @ nom. line voltage 250 Watts @ 4 Ohms nominal line voltage
Protections
Short Circuit Protection YES functional Direct short at output
Amplifier should resume operation after short
circuit condition removal
Thermal Protection YES functional
@1/8 max unclipped Power at
1.06 times the input voltage
Temperature rise in accessible metal parts
should not exceed 35K rise for domestic version
or 30K rise for European versions (refer to
requirements sheet).
DC Offset Protection YES - DC present at Speaker Out leads
Design must insure no Offset at the speaker
output under any operating condition including
abnormal operation
Line Fuse Rating
USA-Domestic 3.15 Amps 3.15 Type-T or Slo Blo-250 V Internal fuse with UL/SEMKO rated holder
EU 2 Amps 2
Type-T or Slo Blo-250 V, Low
Breaking capacity
Internal fuse with UL/SEMKO rated holder
Other Parameters/Notes:
1. Limiter circuit response must be clean sounding with no apparent pops, noises, or pumping.
2. Volume control should be
at the input buffer stage in order to lessen the possibility of clipping the input section with highly dynamic audio material.
3. ALL SPECS SHOULD BE MEASURED AT NOMINAL LINE VOLTAGE.
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ES250P