13
TROUBLESHOOTING HINTS
1. The bell does not ring.
When the PAGE SW of the
base is pressed, does the
ringer on the handset ring?
When the TEL SG is joined
with the base to make bell
signal, is there pulse wave on
Pin 4 of IC2?
Then, is there pulse wave
on Pin 24 of IC3?
By using voltage chart,
check IC3.
Check the surrounding
circuit where the voltage is
incorrect.
By using voltage chart, check
IC2.
Check TEL network primary
circuit.
Check IC3, C85, R45 and
R44.
IC3 is defective.
See 2. The bell does not ring
& page does not ring.
IC2 is defective.
OK
NG
OK
OK
NG
OK
NG
OK
NG
NG
Summary of Contents for FT-7007LBR
Page 1: ... PUBLISHED IN JAPAN Nov 1998 0 10 2 3 456789 FT 7007LR FT 7007LBR ...
Page 8: ...7 BLOCK DIAGRAMS Base Unit ...
Page 9: ...8 Handset ...
Page 11: ...11 12 Handset RX VCO TEST POINT RF TEST POINT TX VCO TEST POINT DISCRI TEST POINT ...
Page 26: ...27 WIRING DIAGRAM Handset ...
Page 43: ......
