Sanyo EM-G450 - Page 8

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PnMDnNFNT I CHECKOUT PROCEDURE I
RESULTS
““,... v. . . . . .
-.
1) Measure the resistance : Across two terminals with an
Normal reading :
ohm-meter on highest scale
Momentarily indicates several
ohms, and gradually returns
/
/
to 10 Meg-ohm.
{IGH VOLTAGE
;APACITOR
o
Abnormal reading :
ncluding
Indicates continuity or 10MQ
ILEEDER
from the beginning.
IESISTOR
Figure 8
Measure the resistance : Across two terminals with an
Normal reading :
ohm-meter on its highest scale.
Indicates over 10MQ in one
direction (forward direction)
and infinite ohms in the
/
/
reverse direction, using meter
G)
which is provided with a 9-volt
battery.
HIGH
,
NOTE
VOLTAGE
,.’
Some digital meters may
DIODE
show over even in a forward
direction because low
measuring voltage of meter
does not allow the meter
current to pass through
Figure 9
the high voltage diode.
Abnormal reading:
Indicates continuity or infinite
ohms in both directions.
Measure the resistance : Across two terminals with an
ohm-meter on its highest scale.
Normal reading :
/
J
Indicates continuity.
o
P
0. ,
Abnormal reading :
HV FUSE
---
Indicates infinite ohms.
-..
-..
..
..
..
‘.
Figure 10
Measure the voltage : Between test points TP-1 ,TP-2,TP-3
CONTROL
and ground or between TP-4, and TP-5. ( See
Test TP-1
TP-2 TP-3 TP-41
CIRCUIT
control circuit board on page 20 )
point
TP-5
BOARD
NOTE
COMPLETE
Voltag~
-5V -12V
-30V 2.OV
Proceed with the check of the step down transformer, to
DC DC
DC AC
see if any one of the measured values is different from the
specified values.
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