ALESIS HR-16 - Manual (Page 20)

HR-16/HR16B Service Manual 1.00 14
7.20 PUP Capacitor
• Revision CA
When the PUP circuit first appeared, it was found that the circuit would occasionally oscillate
on power up, causing noise. This was eliminated by adding a bypass capacitor (later incorporated
as C62) across the power supply pins of U20 (pins 4 and 11).