Ps-855b Maintenance Manual Digital-controlled versions of the PS-855B require periodic recalibration. The manual provides trimmer locations (VR1, VR2, etc.) and step-by-step adjustments using a 6.5-digit multimeter. The manual begins with stark warnings. Pay attention to: ps-855b maintenance manual Based on service logs from repair shops, the PS-855B exhibits several age-related failures. The maintenance manual provides specific remedies. ps-855b maintenance manual