Ecler XPA7000, Руководство по обслуживанию

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51-0172-0100 XPA.doc 1 of 2
MAKING PROTECT LAMP HOLDER
Protect lamp holder application: series one lamp from the amplifier power cable connector to AC
outlet. If the amplifier has no fault, at the instant of switch on, the lamp is very bright because of
high current pass through, when inner capacitor change up, amplifier is empty loading, the
current is very small, the lamp isn’t on or slightly bright. If the amplifier has some short circuit
faults that haven’t checked out, that will be high current, through in series to lamp, it will be
bright all the time, meanwhile, since the in series lamp limited the current, it won’t make the
damage expanded so as to protect amplifier, that is why it named “protect lamp holder”. When
amplifier confirm there’s no high current pass through, it can be by pass via the switch to make
amplifier AC Main power supply connect to the outlet directly.
SAFETY VERIFICATION TESTS.
Preliminary:
- Unplug the unit to be tested from the mains outlet.
- Short all ground terminals from signal inputs, outputs and other external connectors, except
the mains plug’s ground.
- Turn ON the unit’s main power switch.
Ground continuity test:
- Connect the tester’s probes between the mains ground contact and the unit’s backside main
ground test point. When applying a 10A current, verify that the ground impedance is lower
than
0’1
Ω
.
Electrical insulation test:
- Connect the electrical insulation tester probes between the mains outlet ground contact and
both shorted mains input poles.
- Adjust the tester’s current limit down to 10mA.
- Apply 1500Vac during 5 seconds.
- The unit’s insulation should be able to resist this voltage, without generating spurious sparks
or a sparkover effect, and the tester may not detect any malfunction.
CAUTION: Do not disconnect nor touch the test probes until the test has finished completely!
author:
J. Colomines
date:
060309
project: product:
XPA
ECLER
approved:
num:
51.0172
version:
01.00
title:
VERIFICATION PROCESS