Read Sony MPK-DVF Service Manual online
– 6 –
Water
Water depth
: 1m or more
: 1m or more
Water tank, bathtub, swimming pool, etc. Marine Pack
1. Concerning Defects
Marine Pack defects are classified as the three following types.
1) Operational defects
This type mainly involves malfunctions caused by electrical cir-
cuit or parts defects. Repair is the same as for normal products.
cuit or parts defects. Repair is the same as for normal products.
2) Damaged and missing parts
Waterproofing is sometimes affected by the locations of defects
and symptoms. Before making repairs, always use the check list
to check the type of defect.
and symptoms. Before making repairs, always use the check list
to check the type of defect.
Note :
Refer to page 8 for the check list.
3) Water leaks
After the discovery of a defect or after making repairs, it is nec-
essary to perform either a hydraulic pressure test or simple wa-
ter leak test using a water tank.
essary to perform either a hydraulic pressure test or simple wa-
ter leak test using a water tank.
2. Concerning Water Leaks
To ensure waterproofing, O-rings are used in the holes in the
Marine Pack housing for openings, shafts, display windows and
the front glass. Water leaks are possible in any of these locations
but the conditions under which water leaks occur differ for the
openings and the other parts.
Marine Pack housing for openings, shafts, display windows and
the front glass. Water leaks are possible in any of these locations
but the conditions under which water leaks occur differ for the
openings and the other parts.
1) Water leaks at openings
Openings are waterproofed using O-rings compressed by the
force of the buckle spring.
Near the surface of the water, where little water pressure is ap-
plied to Marine Pack, the force of the buckle alone provides
sufficient waterproofing. As the water pressure applied to Ma-
rine Pack increases at greater depths, however, the force applied
to the O-rings increases due to the water pressure to increase the
waterproofing.
Because of this, due to the type of waterproofing construction
used, opening water leaks are more prone to occur in shallow
water (approx. 2 meters) than in deep water. Also, since there is
a gap between the front and rear housings, sand and dirt tend to
enter and adhere to the O-ring in shallow water. When the cover
is opened, this sand and dirt can then enter under the O-ring and
cause a water leak the next time Marine Pack is used.
This, most water leaks in the openings are the result of adhered
dirt, sand, hair and other foreigh matter as well as O-ring and
housing damage due to careless handing.
force of the buckle spring.
Near the surface of the water, where little water pressure is ap-
plied to Marine Pack, the force of the buckle alone provides
sufficient waterproofing. As the water pressure applied to Ma-
rine Pack increases at greater depths, however, the force applied
to the O-rings increases due to the water pressure to increase the
waterproofing.
Because of this, due to the type of waterproofing construction
used, opening water leaks are more prone to occur in shallow
water (approx. 2 meters) than in deep water. Also, since there is
a gap between the front and rear housings, sand and dirt tend to
enter and adhere to the O-ring in shallow water. When the cover
is opened, this sand and dirt can then enter under the O-ring and
cause a water leak the next time Marine Pack is used.
This, most water leaks in the openings are the result of adhered
dirt, sand, hair and other foreigh matter as well as O-ring and
housing damage due to careless handing.
2) Water leaks at other openings
Parts where there are holes in the housing (shafts, display win-
dow, front and rear glass) are constructed with O-rings mechani-
cally compressed by screws and nuts.
Due to the construction, these places cannot be reached with the
hands : therefore, the waterproofing is more secure than that of
the openings.
The causes of water leaks are damage of the parts compressing
the O-rings, loosening of the screws and nuts fastening the parts
and improper reassembly.
dow, front and rear glass) are constructed with O-rings mechani-
cally compressed by screws and nuts.
Due to the construction, these places cannot be reached with the
hands : therefore, the waterproofing is more secure than that of
the openings.
The causes of water leaks are damage of the parts compressing
the O-rings, loosening of the screws and nuts fastening the parts
and improper reassembly.
3. Water Leak Check Methods
After the discovery and repair of water leak, it is necessary to per-
form a hydraulic pressure test and water leak test using a water
tank.
form a hydraulic pressure test and water leak test using a water
tank.
1) Opening water leak check method
As was mentioned above, due to the construction, water leaks in
openings are more prone to occur in shallow water than in deep
water. Consequently, a simple water leak test using a water tank is
sufficient in many cases, without performing a hydraulic pres-
sure test.
openings are more prone to occur in shallow water than in deep
water. Consequently, a simple water leak test using a water tank is
sufficient in many cases, without performing a hydraulic pres-
sure test.
*Water leak test
In this method, Marine Pack immersed in a tank filled with wa-
ter and checked for water leaks.
Marine Pack should be left immersed in the water tank (or bath-
tub, swimming pool, etc.) for at least 15-20 minutes with the
covers closed. The water depth should be at least 1 meter.
ter and checked for water leaks.
Marine Pack should be left immersed in the water tank (or bath-
tub, swimming pool, etc.) for at least 15-20 minutes with the
covers closed. The water depth should be at least 1 meter.
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