Subwoofer Amp Troubleshooting - Infinity PS212W Service Manual

PS212W subwoofer
Start
Dc voltage check
±Vcc,±15V
OK
yes
Power on check
LED red &green
OK
yes
Test frequency
Response
OK
yes
Test frequency
Response
OK
yes
Test input sensitivity
OK
PS212W Testing Flow Chart
no
Check transformer
C C ,D ,
168, 169 123
D C
124, 170
Check vol module
no
& connector
cable& ±15V.etc
no
Check U ,uR ,
102 133
C R ,C .etc
121, 135 122
no
Check U105
C137C137CC143etc
no
Check U ,R
101 117,
R R etc
112, 114
yes
Test protection
no
OK
yes
Test limiter circuit
no
OK
yes
Check THD output
power, noise
no
OK
yes
Auto off Function
Hi pot test
no
OK
yes
Listening test
no
OK
yes
The Amp ass'y ok
END
13
Check U .R
107 237
±15Vcc etc
Check U .Q etc
106 107
Check pre board
& power board ,
±Vcc,±15V etc
Check U .Q
103 101.
Q .C R ;Ac
102 131. 142
cord, Transformer.