UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Marconi_MPT4 · 29th Jul 2016, 12:04 am

Hi,
Between the bias oscillator output board and the record head is relay R401 on the track selector board. On a few occasions have had to clean the contacts, or replace relay in severe cases. Also the bias appears to be routed through track selector switch which may have an open circuit. In both instances no head load gives high output with little or no adjustment level.

Try swapping over the bias output connections on pins 8 and 9 of the bias oscillator board to help confirm location of fault.

Rich

29th Jul 2016, 12:04 am	#2
Marconi_MPT4 Heptode Join Date: Mar 2011 Location: Dorset, UK. Posts: 521	Re: Akai GX365 Hi, Between the bias oscillator output board and the record head is relay R401 on the track selector board. On a few occasions have had to clean the contacts, or replace relay in severe cases. Also the bias appears to be routed through track selector switch which may have an open circuit. In both instances no head load gives high output with little or no adjustment level. Try swapping over the bias output connections on pins 8 and 9 of the bias oscillator board to help confirm location of fault. Rich __________________ To an optimist a glass is half full; a pessimist half empty; an engineer twice as big as need be!