Recently had an Internal PSU fail on an Icom 970. Fault was traced to a
resistor going short due to some adhesive used at manufacturing becoming
conductive with age? anyway resistor replaced gunk cleaned away. While
repairing it was noticed the circuit has an optical switch in the start up
circuit. This lost a leg when the short took place and despite repair it
appears not too work.
Havent tried Icom as they seem to be quite useless, order replacement VFO
assembly and received notch filter switch!

The device is a small black encapsulated unit, looks like a 4 legged black
capacitor! It is Neon rather than LED according to the circuit diagram. Cant
seem to find anything on it at all on the net. Appears to have been made by
a company called Stuaw Kigai.

Anybody got any suggestions ?

Recently had an Internal PSU fail on an Icom 970. Fault was traced to a
resistor going short due to some adhesive used at manufacturing becoming
conductive with age? anyway resistor replaced gunk cleaned away. While
repairing it was noticed the circuit has an optical switch in the start up
circuit. This lost a leg when the short took place and despite repair it
appears not too work.
Havent tried Icom as they seem to be quite useless, order replacement VFO
assembly and received notch filter switch!

The device is a small black encapsulated unit, looks like a 4 legged black
capacitor! It is Neon rather than LED according to the circuit diagram.
Cant
seem to find anything on it at all on the net. Appears to have been made
by
a company called Stuaw Kigai.

Anybody got any suggestions ?
============================================
Suggest you consider using an optocoupler with a suitable input and output
circuit added.

Not knowing the voltage levels the failed component operates at and whether
it is in an AC or DC environment,the opto-coupler's input circuit could be
tailored with a resistive network ( possibly with an added diode in case of
an AC circuit) and the output circuit with a HV transistor if necessary.

Frank GM0CSZ / KN6WH

Recently had an Internal PSU fail on an Icom 970. Fault was traced to a
resistor going short due to some adhesive used at manufacturing becoming
conductive with age? anyway resistor replaced gunk cleaned away. While
repairing it was noticed the circuit has an optical switch in the start up
circuit. This lost a leg when the short took place and despite repair it
appears not too work.
Havent tried Icom as they seem to be quite useless, order replacement VFO
assembly and received notch filter switch!

The device is a small black encapsulated unit, looks like a 4 legged black
capacitor! It is Neon rather than LED according to the circuit diagram.
Cant
seem to find anything on it at all on the net. Appears to have been made
by
a company called Stuaw Kigai.

Anybody got any suggestions ?
============================================
Suggest you consider using an optocoupler with a suitable input and output
circuit added.

Not knowing the voltage levels the failed component operates at and whether
it is in an AC or DC environment,the opto-coupler's input circuit could be
tailored with a resistive network ( possibly with an added diode in case of
an AC circuit) and the output circuit with a HV transistor if necessary.

Frank GM0CSZ / KN6WH

Think it is 110V after a resistor. Think its 300v before. The problem is it
is contained in an area that is very small and surrounded by other
components. Opted to strip the device and will try and find what exactly,
has gone up in smoke! Maybe repair existing one. Would have hoped gareth or
one of his cronnies would have given me their expert guidence, they always
witter on about, but nope Oh well. Thanks to the two people that have
emailed me. The guy with the 2.4Ghz units can you resend your email as it
got deleted by mistake , before I got to reply. Bit over zealous with
delete trying to get rid of SPAM!

Tom
M3CBZ


"Frank Dinger" wrote in message
...
Recently had an Internal PSU fail on an Icom 970. Fault was traced to a
resistor going short due to some adhesive used at manufacturing becoming
conductive with age? anyway resistor replaced gunk cleaned away. While
repairing it was noticed the circuit has an optical switch in the start
up
circuit. This lost a leg when the short took place and despite repair it
appears not too work.
Havent tried Icom as they seem to be quite useless, order replacement
VFO
assembly and received notch filter switch!

The device is a small black encapsulated unit, looks like a 4 legged
black
capacitor! It is Neon rather than LED according to the circuit diagram.
Cant
seem to find anything on it at all on the net. Appears to have been made
by
a company called Stuaw Kigai.

Anybody got any suggestions ?
============================================
Suggest you consider using an optocoupler with a suitable input and output
circuit added.

Not knowing the voltage levels the failed component operates at and
whether
it is in an AC or DC environment,the opto-coupler's input circuit could be
tailored with a resistive network ( possibly with an added diode in case
of
an AC circuit) and the output circuit with a HV transistor if necessary.

Frank GM0CSZ / KN6WH

Think it is 110V after a resistor. Think its 300v before. The problem is it
is contained in an area that is very small and surrounded by other
components. Opted to strip the device and will try and find what exactly,
has gone up in smoke! Maybe repair existing one. Would have hoped gareth or
one of his cronnies would have given me their expert guidence, they always
witter on about, but nope Oh well. Thanks to the two people that have
emailed me. The guy with the 2.4Ghz units can you resend your email as it
got deleted by mistake , before I got to reply. Bit over zealous with
delete trying to get rid of SPAM!

Tom
M3CBZ


"Frank Dinger" wrote in message
...
Recently had an Internal PSU fail on an Icom 970. Fault was traced to a
resistor going short due to some adhesive used at manufacturing becoming
conductive with age? anyway resistor replaced gunk cleaned away. While
repairing it was noticed the circuit has an optical switch in the start
up
circuit. This lost a leg when the short took place and despite repair it
appears not too work.
Havent tried Icom as they seem to be quite useless, order replacement
VFO
assembly and received notch filter switch!

The device is a small black encapsulated unit, looks like a 4 legged
black
capacitor! It is Neon rather than LED according to the circuit diagram.
Cant
seem to find anything on it at all on the net. Appears to have been made
by
a company called Stuaw Kigai.

Anybody got any suggestions ?
============================================
Suggest you consider using an optocoupler with a suitable input and output
circuit added.

Not knowing the voltage levels the failed component operates at and
whether
it is in an AC or DC environment,the opto-coupler's input circuit could be
tailored with a resistive network ( possibly with an added diode in case
of
an AC circuit) and the output circuit with a HV transistor if necessary.

Frank GM0CSZ / KN6WH