ALESIS HR-16 User Manual
Page 23
HR-16/HR16B Service Manual 1.00
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Some or all drum sounds are distorted.
PCM-54 DAC out of adjustment.
Adjust according to section 6.3.
Faulty PCM-54 DAC.
Replace and retest.
Incorrect EPROM. (Oftentimes users will
attempt to install the HR-16A/B EPROM into
their new HR-16B. WRONG! This EPROM is
intended to be used only in the HR-16, and
does not have the correct MASK ROM
addressing tables to play HR-16B sounds).
Check and replace if necessary.
Faulty DM3AG ASIC.
Replace and retest.
Faulty power supply rail.
Troubleshoot and repair as necessary.
Faulty PUP circuit (one rail not making it to the
op-amp).
Troubleshoot and repair as necessary.
Volume slider only works for 1/2 of it's range.
Slider wiring incorrect for particular main PC
Board revision.
See section 7.19.
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