Futaba (Japan ca. 1990) Pulscale SA20NA / EJN001 Pulscale SA20NA / EJN001 Linear scale / Amplifier (for DRO)

Futaba Pulscale SA20NA / EJN001 is a linear scale amplifier used to convert the pulsed output of the SA20NA encoder into an analog voltage for a digital readout DRO system. Common failure modes on this vintage unit include burned‑out or degraded amplifier ICs, cracked PCB traces from vibration, and loss of signal due to corroded connector pins or misaligned cable harnesses; the 5 V supply pin is also prone to dropout under high load. First‑check steps: verify that the 5 V DC input is present at the amplifier board, inspect all connectors for corrosion or loose contacts, and measure the output voltage while rotating the encoder shaft to confirm proper signal generation.[oss-gpt-20b] Post Comment

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