PS series PS28 subwoofer
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| PS28 | ||||
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| Troubleshooting Flow Chart | |||||||||||
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| AMP no signal out |
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| no |
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| Check Fuse,Transformer, | ||||||
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| yes |
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| D110, etc | ||||
DC voltage check ±Vcc |
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| yes |
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| yes | no |
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| Check Q117,118,119,D109 etc |
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| yes |
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| yes |
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LED light green or red
LED red | Check,Q206,Q207,U203 etc |
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LED light green | yes | ||
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| no |
Check U202 pin14 signal |
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Check U201 pin14 signal
yes
CheckU201,U202,VR201 VR202. etc
yes 
yes 
Check limiter board C304
no
no
Check U301,R343,R344 , C340,Q301,Q302, etc
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| yes | |
yes | yes |
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Check ,+VCC& |
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Test R121,R122 signal |
| no | DC voltage | no | Check J123,J124 etc | ||
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yes |
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| yes | |||
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Check RY101,D102,Q113,Q114 etc
yes
Check Q107,Q108,Q105, Q106,Q103,Q104,U101,etc
no
Check U101,Q115,Q116,R138 etc |
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| Set R138 to R140’S | |||
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| Voltage is 0.51VDC | |
| yes |
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| yes |
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| Check P102 signal |
| Amp ass’y is OK, Finish | ||||
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12
