John Bennett
Senior Member
[ukvac] TECH: Phoenix sound problems
Hi all...
I have two original Phoenix PCBs, both with sound faults. They also
appear to have modifications on them which aren't in the service
manual.
Both boards have a wire link from pin 1 of IC45 (4006) which is
lifted from the board, to pin 3 of IC50 (a 555 timer). One board has
no sound from the melody chip, which I suspect is in a faulty socket.
The chip itself is OK.
The other board also has pin 4 of IC42 (a 555) lifted, and connected
via 10k resistors to pins 2 and 14 IC46 (LM324). This board has no
explosion sound when you hit the aliens, just a quick clicking noise.
Does anyone know what these mods do, and are they official?
Thanks in advance
Dave
DATA Imported from archives: originally posted by canonman75 (david@smethurst75.fsnet.co.uk)
Hi all...
I have two original Phoenix PCBs, both with sound faults. They also
appear to have modifications on them which aren't in the service
manual.
Both boards have a wire link from pin 1 of IC45 (4006) which is
lifted from the board, to pin 3 of IC50 (a 555 timer). One board has
no sound from the melody chip, which I suspect is in a faulty socket.
The chip itself is OK.
The other board also has pin 4 of IC42 (a 555) lifted, and connected
via 10k resistors to pins 2 and 14 IC46 (LM324). This board has no
explosion sound when you hit the aliens, just a quick clicking noise.
Does anyone know what these mods do, and are they official?
Thanks in advance
Dave
DATA Imported from archives: originally posted by canonman75 (david@smethurst75.fsnet.co.uk)