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.

MFJ Variable Power Supply

Status: May 2026 - Walking Wounded; being worked on by WB9YZU. History: Came into operate station and LDG Tuner was inoperative.

Diagnosis: Traced issue to power switch on this supply having been jury rigged with a piece of painter's tape on the main switch. Tape had weakened and the contacts opened & was unrecoverable.

Status 2: Removed switch and covered opening with electrical tape. Connected switch lead from power cord to transformer input via a push clip jumper. I have extra rocker switches at home. Compared to rocker housing removed at YT shack, and 3D printed an adapter plate. Will complete repair soon.

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.