Can Not Control Input Selection - Technics SU-G700E Service Manual

7.9.

Can not control Input Selection

Can not control Input selection.
Is the correct voltage
presented at P8301 on Selector PCB?
Pin 1 and 6: +3.1 to 3.4V
Is FFC between
OLED PCB and Selector PCB
damaged?
Replace FFC.
changed at P8301 on
Selector PCB during Input Selector rotation?
Between Pin 4 and 3, Pin 5 and 3:
Normal: +3.1 to 3.4V
changed at P8001 on
OLED PCB during Input Selector rotation?
Between Pin 21 and 16, Pin 22 and 16
Normal: +3.1 to 3.4V
changed at P7005 on
Main PCB during Input Selector rotation?
At Pin 9 at Pin 10:
when rotation: +0.1V or lower
without rotation: +3.1 to 3.4V
Between
Is the correct voltage
YES
presented at P8004 on OLED PCB?
Pin 1 and 6: +3.1 to 3.4V
NO
Replace Selector PCB.
YES
Is FFC between
Main PCB and OLED PCB
damaged?
YES
Replace FFC.
Is the voltage
YES
Is the voltage
YES
Is the voltage
YES
NO
Between
YES
presented at P7005 on Main PCB?
Pin 11 and 24: +3.1 to 3.4V
Is FFC between
NO
P4551 on Main PCB and
P6502 on AMP PCB
Replace FFC.
Replace OLED PCB.
NO
Replace Selector PCB.
NO
Is FFC between
Main PCB and OLED PCB
damaged?
YES
Replace FFC.
NO
Replace Selector PCB.
Replace Main PCB.
26
NO
Is the correct voltage
Between
YES
damaged?
YES
Replace Main PCB.
Replace AMP PCB.
Replace SMPS PCB.
NO
Replace OLED PCB.
NO
NO
Still not remedy.
Still not remedy.