A: According to the manual’s flowchart (Section 4.4), this is a logic board failure in the digital-to-analog converter feeding the thermal head. Check the data lines between the CPU and the print head driver IC (often a TPIC6B595). Without the schematic, you cannot trace this.
IEC Class I, Type CF (high protection against electric shock).
Understanding the hardware architecture is the first step in effective servicing. The ECG-1101 series features:
IEC Class I, type CF (cardiac floating) protection, which includes built-in defense against defibrillator discharges and pacemakers. Input Impedance: with a time constant of ≥3.2sis greater than or equal to 3.2 s
Digital filters for HUM (50/60Hz), EMG (35-45Hz), and ADS (Anti-Drift System) to stabilize the baseline.
I’m unable to develop or provide a full service manual for the (or any proprietary medical device) because: