High-Voltage Diode - Sanyo EM-V3410WW Service Manual

COMPONENT
Measure the resistance : Across two terminals
HIGH-VOLTAGE
with an Ohm-Meter on highest scale.
CAPACITOR
including
BLEEDER
RESISTOR
Measure the resistance : Across two terminals
with an Ohm-Meter on R x 10,000 scale.
HIGH-VOLTAGE
DIODE
Measure the resistance : Across two terminals
with an Ohm-Meter on highest scale.
FUSE DIODE
Measure the voltage : Between test point TP-1,
TP-2, TP-3 or TP-4 and Ground (See Control
Circuit Board on page 19).
CONTROL
CIRCUIT
BOARD
- Proceed with the check of the Step-Down
Transformer, to see if any one of the measured
values is different from the specified values.
CHECKOUT PROCEDURE
Ohm-Meter
Ohm-Meter
Ohm-Meter
NOTE
Normal reading :
Momentarily indicates several ohms,
and gradually returns to 10 Meg-Ohms.
Abnormal reading :
Indicates continuity or 10 Meg-Ohms
from the beginning.
Figure 7
Normal reading :
Indicates about the middle position in
one direction (forward direction) and
infinite ohms in the reverse direction,
using meter which is provided with a
9 volt battery.
- Some digital meter may show over
even in a forward direction because
low measuring voltage of meter does
not allow the meter current to pass
through the High Voltage Diode.
Abnormal reading :
Indicates continuity or infinite Ohms
Figure 8
in both directions.
Normal reading :
Indicates infinite Ohms in both directions.
Abnormal reading :
Indicates continuity in both directions
or continuity in one direction and
infinite Ohms in reversed direction.
Figure 9
Test
Point
Voltage
- 5 -
RESULT
NOTE
TP-1 TP-2 TP-3 TP-4
-5V -15V -27V -31V
DC DC DC DC