Philips DVD 580M, Service Manual, Page: 25 / 60

Diagnostic Software, Trouble Shooting and Test Instructions
EN 25 DVD580M 5.
5.3.10 Microphone Not Working
Figure 5-10
5.3.11 Microphone Cannot Sw Off
Figure 5-11
No voice from Microphone
Check point : the Q17 on decoder board
Observe : check the collector terminal voltage is +0v7
Solution : replace the transistor
Go
No
Solution : check the +5V supply
circuit, replace any defected
components
Solution : replace the Q16
Solution : Replace U205 on power
supply board (karaoke part) if no
signal output from pin 15
Check point : Q16 on decoder board
Observe : check if the Collector terminal is short circuit to
ground
Check point : Microphone input
Observe : check if the any signal presenting at pin 1 of CN205
by hitting the microphone
Check point : pin 1 of U205 on power supply board
Observe : check the +5V is presented
Yes
Yes
Yes
No
No
Yes
Check point : VA+ and VA- on Microphone board
Observe : check if the supply voltage is + / -- 9v3
No
Solution : check the connector
between power board and
Microphone board
No
Solution : replace the U401 on Microphone board
Yes
CL 26532085-069.eps
180702
Cannot turn OFF the voice from Microphone
Check point : Microphone control key on remote control
Observe : press the key and check the voltage changes on
R114
Solution : check if any short circuit at
signal link
Go
No
Solution : Replace Q17
Solution : check and replace Q16 if
defected Check point : collector terminal of Q17 on decoder board
Observe : check the voltage is 0v7
Yes
No
Yes
CL 26532085-070.eps
180702