Panasonic KX-F900 Service Manual page 68

I ..... I
3-8. ANALOG BOARD SECTION
For example ]
Returns from the custorner has 2 of the defects.
complaint
X HANDSET transmitting
X SP-PHONE transmitting
How can you repair this unit?
We usually check the signal flow with the circuit schematic.
(If defect is only one item, we check only one of the signal routes.
Maybe something is defective on that route.)
If there is more than one defect, you need to check some of the routes.
At first, you should check the area where there are common components on
these signal routes.
Please see the check sheet (next page).
68