Repairs

Equipment Repairs

Purpose: To log status of equipment Status/Repairs. Created 05/15/2026 Ron, WB9YZU

PENDING

FT-847 All mode Transceiver

Status: May 2026 - Found disassembled on bench at W9YT Shack. Skylar indicated unit suddenly stopped TX in SSB but worked in CW mode and that diagnosis had been limited to tracing problem via block diagram. Speaker terminals are torn off connector. WB9YZU took home to evaluate, diagnose, and hopefully repair. As this unit is from the 1990's specialized Yeasu components may be NLA.

Diagnosis: Re-evaluated May 2026 - Only TX in FM Mode, RX seems to be unaffected. No Carrier symptom in CW, SSB, and AM Modes seems to indicate a common mode failure. Found SSB signal output at U1002, but no signal at Q1024 VCO output which is common to all modes except FM. Traced back to Q1011 PLL Chip no generating signal. Observed no CLK[3] or Data[3] Signals at Q1011. In process May 2026.

COMPLETED

ORION OR-2800 Rotor Controller (Non-Digital)

Status: May 2026 - Repairs completed by WB9YZU.

Replaced DPDT Direction control switch. Evaluated HEADING count issue which was traced to bad POS signal from Rotor. Looks like wiring got mixed up between the rotor and the Controller. NOTE: This Rotor and box that were donated to replace the broken M2 OR2800 Rotor and RC2800 Controller is a 30yo (per M2) system that uses an AC Motor (Verified). This box has been repaired Many times in its lifetime. Observed a lag in motor activation and sometimes 2 tries multiple tries. Contactors are being activated, so may require new contactors at a future data.

MFJ Variable Power Supply

Status: May 2026 - Repairs completed by WB9YZU.

Power Switch was found to be broken and covered with painter's tape. Power supply was DOA and caused LDG Tuner not to work. Replaced broken power switch. Adapted Amazon switch with 3D printed escutcheon.