Onwa KR-1338 Service Manual page 53

From on page 5-10
Check TX pulselength
selection signal.
Check DJ-1 #7,#8
NG
on display unity for
proper operation.
OK OK
NG
Magnetron usage time
within in 2000 hrs.
OK
Check if AUTOMATIC
KR-1338/1668: 5 V to 28 V
TUNE voltage is output from
display unit.
(Switch from ST-BY to TX)
Check level at DJ-1 #6
NG
on display unit changes
normally.
OK
Check TUNE IND. Voltage
All model: 1 to 2.5V
input to display unit.
(Switch from ST-BY to TX)
NG
Max. Value
OK
Faultu MIC.
Signal 0.25 NM 2 NM 12 NM
PL B, DJ-1 #7 0 V 0 V
PL A, DJ-1 #8 0 V 12 V
Faulty pcb MAIN-0910.
Replace magnetron.
Faulty pcb MAIN-0910.
KR-1338//1668: Faulty pcb IF-0711.
12 V
12 V
49