All Trademarks are property of their respective companies. HR-16/HR16B Service Manual 1.00 17 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.