51-0184-0100 EP08-06 MPA4-400R Anglès.doc 4 of 5
- On the unit’s STEREO/BRIDGE IN3/B IN3+IN4 switch, select IN3+IN4. By now both outputs
should be push-pull configured. The SP 4 indicating LED turns off. Verify that now only
channel three’s input potentiometer is active, and leave it up to its maximum position.
- Verify that all CLIP-indicating LED’s are lit. If necessary, add 1 or 2 dB to the input signal level.
- On the IN3/IN3+IN4 switch, select IN3+IN4. Check that the output level has dropped 6dB.
- Leave the switch again to IN3.
BURNING TEST.
Leave the tested unit connected to its correspondent mains voltage, applying input signal
and connecting load impedances, and running at its burn test level for at least 24 hours.
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 disfunction.
CAUTION: Do not disconnect nor touch the test probes until the test has finished completely!
