Panasonic KX-FT21BX

TROUBLESHOOTING GUIDE
- 79 -
KX-FT21LA
3-11. SENSOR SECTION (Refer to page 130~132 for the circuit descriptions.)
(1) Check the document sensor (PS1)
....
" REMOVE DOCUMENT "
(2) Check the read position sensor (PS2)
....
" CHECK DOCUMENT "
Check the voltage at pin 3 of CN2.
Document set 4~5V
No document 0V
When the pin
3 of CN1 and
pin 8 of IC1 is
low level.
Check the voltage at pin 3 of CN2.
Document set 0V
No document 4~5V
When the pin
2 of CN1 and
pin 8 of CN1
is
low level.
Replace PS2.
Replace PS1.
Check the soldering
at Q2, Q3, D1, R11.
Check the soldering
at Q1, Q3, D1, R11.
OK
Check the soldering at R12.
Check the soldering at R12.
NG
NG
OK
OK
OK
OK
OK
Check if CN6 and CN7 (digital board)
or CN1 and CN2 (operation board) is
disconnected.
Check if CN6 and CN7 (digital board)
or CN1 and CN2 (operation board) is
disconnected.