Onwa KR-1338 Service Manual page 51

Flow chart 8
Check TOTAL ON TIME/
TOTAL TX TIME.
NG
Magnetron usage
time within about
200 0 hrs .
OK
Poor sensitivity.
No echoes; poor
sensitivity
No echoes(white noise appears)
9 to 12 V
Check TOTAL ON TIME/
TOTAL TX TIME.
NG
(No TX trigger)
Check level at DJ-1
#2 on display unit.
OK
KR-1338/1668: 5V to 28 V
Check if TUNE voltage is
output from display unit.
(Switch from ST-BY to TX)
Check that DJ-1
NG
#6 on display unit
changes normally.
OK
Check if TUNE IND. Voltage
All models: 1 V to 2.5 V
is input to the display unit.
(Switch from ST-BY to TX)
To
Symptom: Poor sensitivity.
Install new
magnetron.
To
(page 5-12)
0 V
Faulty pcb MAIN-0910
Faulty pcb MAIN-0910
Check that DJ-1
NG
#18 on display unit
changes normal
OK
Check if video signal
is input to display unit.
Approx. -4V
Check if level
NG
of DJ-1 #16 on
display unit is normal
OK
Faulty pcb MAIN-0910
To
(page 5-12)
0V
KR-1338/1668: Faulty pcb IF 0711
47