Koden MDC-1840BB - Page 165

Chapter 8 MDC-1840BB/1841BB/1860BB/1810BB/1820BB Series
Trouble Shooting And On Board Servicing Operation Manual
8-16 93142122-07
Y
IF PCB is faulty
Ｎ
Y
MIC module is faulty
Ｎ
Y
Y
Tuning meter is faulty
The magnetron is faulty
N
Y
N
Repair a faulty connection
Main Logic PCB or LCD module is faulty
Y
Ｎ
IF PCB is faulty
Finished
Check for the cable connection
between IF PCB (J1) and
Modulator PCB
Is the tuning voltage on J1-3
(IF PCB) about 2 V?
Automatic tuning
does not function
Perform the procedure for
automatic tuning set up
Does the automatic tuning function
become normal?
Is the error message
“MAGNETRON CURRENT
ABNORMAL” shown?
Is the MIC monitor voltage in the
following range?
30 – 70 mV
Is the video signal connection
normal in the Antenna Cable?
No picture