I recently picked up a F-14 and upon doing the sound check realized that 3 of the sounds just don't play. It cycles through the sounds but the Jet sounds just aren't there (01-00, 01-01 and 00-05). The rest of them work fine and the speech works fine. The PIA6821 (U9) on the CPU board does pulse for the missing sounds. The connections between the CPU and Sound board look fine. It has a D-11581 soundboard which looks to be in great shape.
When SW1 on the CPU board is pressed no sound is heard (I think) because if the Eproms check out it will play the 01-00 sound which is one of the Jet sounds which isn't there. Can someone please let me know if this is correct?
When I turn-on it makes 1 tone which according to the manual means that the sound system is OK.
What Ive done so far
* Checked the PIA6821 (U9) - it pulses for the sounds as expected
* Installed new sound/speech Roms
* Checked the gray and gray/green transformer secondary wires for 19.4 volts AC. ~ they were at 10.2 VAC
* Check the CPU board filter capacitor C26 for -12 volts DC.~ it was at -14 VDC
* Check the CPU board filter capacitor C26 for AC ripple (over .75 volts AC). ~ AC Ripple is so minimal I can barely pick it up. Its not over .75VAC
* Tested the volume control ~ it checked out OK
My next step was to replace the C26 capacitor. I didn't want to shell out the cash for a replacement transformer quite yet. For the price of the transformer I may live with the missing sounds for a while.
Im not confident replacing the capacitor will fix anything, so ill be at a loss.
Any suggestions?