Furuno 1622 Service Manual page 29

3) IF Board)03P9269*
Test Point
TP601
TP602
TP603
TP604
4) STC Waveform
Condition ; TX, STC voltage (J809 #9) adjusted to 3.4 to 3.6 V manually.
Test Point ; Between R46 and R47.
Ratings ; V1+3.1,3.5V, V2=0.8,1.0V, V3=0.2,0.4V, T1=40,50us
Check Item
IND 2.5Vdc
ECHO Waveform 6
AGC
IF
Ratings
Same as STC waveform
Not measurable
26
5.4!Test points on Each Board
Remarks