M-Audio Hammer 88 Pro

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1. Cannotturnonthepow er
1) Problemwiththe5VUSBpower:
a) CannotturnontheinstrumentwhenusingUSBpower.Checkifthecomputeristurnedon.Checkif
theUSBportoncomputerisworkingproperly.
b) CheckiftheUSBcableisdamaged.TrywithanotherUSBcable.
c) Checkifthe
PIN1onUSBjackhas5Vvoltage.CheckiftheUSBjackisproperlysoldered.Ifitis
damaged,replaceit.
d) CheckiftherelatedcomponentsoftheUSBjackareproperlysoldered.
e) CheckbothendsofFB2,thegroundingshouldhave5Vvoltage.Ifnot,thencheck
ifFB2isproperly
soldered.IftheFB2isdamaged,replaceit.
f) Checkifthetoggleswitchisdamaged.
g) CheckifthevoltageonbothendsofD8andD9isnormal,ifonlyoneendhasit,thenD8andD9
havevirtualweldingordamage,andthe
damagewillbereplaced.
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2) Problemwiththe9Vpoweradapter:
a) CheckifPIN1ofDJ1detects9V,CheckifDJ1,L2,FB12,FB13,D11andD2areweldedcorrectlyor
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