Sound/speech power supply MA-149 parts

The MA-149 sound/speech supply (A7) has a bridge rectifier BR1 on a bracket (MA-177), a 4800 uF 50 V main filter C3 (XO-288), a pass transistor on a heat sink at Q1 (MA-151) and zeners CR1 30 V (XO-271) and CR2 (XO-257). Its fuse F9 is a 1 A slow-blow (EL-6).

Systems

• Gottlieb System 80
• Gottlieb System 80A
• Gottlieb System 80B

Related tips

• Ground mod step 7: sound/speech power supply ground
• Replace C33 on the speech and sound board
• Sound/speech board supplies on P1
• Sound/speech board (A6) main chips
• Sound/speech board adjustments and test button
• Sound/speech board PROM and clock jumpers
• Sound supply fuse F8 blows after the game runs a while
• No sound though the sound board boots: 5 V reaching it is low, adjust the trim pot

Source: Premier Technology Parts Catalog (System 80, 80A and 80B), Gottlieb / Premier