7.8. Can not control Volume +/-
Can not control Volume +/-.
YES
Is the correct voltage
presented at P8501 on Volume PCB?
Between
Pin 4 and 3: +4.8 to 5.2V
Pin 7 and 3: +3.1 to 3.4V
Pin 8 and 3: -12.5 to -11.5V
Replace OLED PCB.
Is FFC between
Main PCB and OLED PCB
damaged?
YES
Replace FFC.
YES
Replace FFC.
NO
NO
Still not remedy.
Is the correct voltage
presented at P8005 on OLED PCB?
Between
Pin 4 and 3: +4.8 to 5.2V
Pin 7 and 3: +3.1 to 3.4V
Pin 8 and 3: -12.5 to -11.5V
NO
NO
Is FFC between
P4551 on Main PCB and
P6502 on AMP PCB
damaged?
Replace Main PCB.
Replace Volume PCB.
Is FFC between
Volume PCB and OLED PCB
damaged?
YES
Replace FFC.
NO
YES
Replace AMP PCB.
Replace SMPS PCB.
Still not remedy.
Still not remedy.
Is the voltage
changed at P7005
on Main PCB during Volume rotation?
Between Pin 3 and 4:
Volume Minimum : +0.1V or lower
Volume Maxmum : +3.1 to 3.4V
Replace Main PCB.
Replace Volume PCB.
NO
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