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Chapter 8
MDC-1840BB/1841BB/1860BB/1810BB/1820BB Series
Trouble Shooting And On Board Servicing
Operation Manual
8-12
93142122-07
8. Others
9. Antenna unit
Y
Y
IF PCB is faulty
N
N
N
Modulator PCB is faulty
Y
Y
Main Logic PCB is faulty
N
LCD monitor unit is faulty
Main Logic PC B is faulty
Are the following sync signals present at TP12 and TP13 in Main
Logic PCB.
The display synchronization
is unstable.
+12V line is shorted.
Disconnect P6(J6) from the
Modulator PCB. Is the fault
removed?
Disconnect P5(J5) from the
Modulator PCB. Is the fault
removed?
Disconnect P1(J1) from the
Modulator PCB. Is the fault
removed?
Performance Monitor is faulty
Internal wirings in the
Antenna unit or Display unit
is faulty
Texts and graphics displays are erratic.
15.6
μ
s
1.04
μ
s
[TP12]
[TP13]
16.66 ms
46.9us
5 V
0 V
5 V
0 V
Is the RGB signal presented at
the J218 and J219 connector?
N
Y
Main Logic PCB is faulty