LG HB620 Service Manual page 87

4. TROUBLE SHOOTING
4.7.3 Loud speaker path (voice speaker phone/VT)
Loud speaker path as below:
MSM6280 HEADSET_R, HEADSET_L
U301(Speaker/Receiver Selection Switch)
connector) → CN101(LCD FPCB to Main PCB Connector)
Connect the phone to network Connect the phone to network
Equipment and setup call Equipment and setup call
Setup 1KHz tone out Setup 1KHz tone out
Set phone with speaker phone mode Set phone with speaker phone mode
The sine wave appear at The sine wave appear at
The sine wave appear at The sine wave appear at
Change the speaker Change the speaker
LGE Internal Use Only
→ C324,C301
→ FB302,FB303
Start Start
FB302,FB303 FB302,FB303
YES YES
pads of speaker? pads of speaker?
YES YES
YES YES
END END
- 88 -
→ U805(Audio Codec)
→ CN502(Main PCB to LCD FPCB
→ OUT1, OUT2(SPK PAD)
NO NO
Change the Main board Change the Main board
NO NO
change the LCD FPCB change the LCD FPCB
Copyright © 2008 LG Electronics. Inc. All right reserved.
→ SPK_R, SPK_L →
→ Speaker
Only for training and service purposes