Denon DP-A100 Service Manual download pdf (Page 3)

SAFETY PRECAUTIONS

The following check should be performed for the continued protection of the customer and service technician.

LEAKAGE CURRENT CHECK

Before returning the unit to the customer, make sure you make either (1) a leakage current check or (2) a line to chassis

resistance check. if the leakage current exceeds 0.5 milliamps, or if the resistance from chassis to either side of the

power cord is less than 460 kohms, the unit is defective.

Be sure to test for leakage current with the AC plug in both polarities, in addition, in each power ON, OFF and STANDBY

mode, if applicable.

CAUTION

Please heed the points listed below during servicing and inspection.

◎

Heed the cautions!

Spots requiring particular attention when servicing, such

as the cabinet, parts, chassis,etc., have cautions indicated

on labels. be sure to heed these causions and the

cautions indicated in the handling instructions.

◎

Caution concerning electric shock!

(1) An AC voltage is impressed on this set, so touching

internal metal parts when the set is energized could

cause electric shock. Take care to avoid electric

shock, by for example using an isolating transformer

and gloves when servicing while the set is energized,

unplugging the power cord when replacing parts, etc.

(2) Tere are high voltage parts inside. Handle with extra

care when the set is energized.

◎

Caution concerning disassembly and

assembly!

Through great care is taken when manufacturing parts

from sheet metal, there may in some rare cases be burrs

on the edges of parts which could cause injury if ﬁ ngers

are moved across them. Use gloves to protect your hands.

◎

Only use designated parts!

The set's parts have specific safety properties (fire

resistance, voltage resistance, etc.). For replacement

parts, be sure to use parts which have the same

poroperties. In particular, for the important safety parts

that are marked

on wiring diagrams and parts lists, be

sure to use the designated parts.

◎

Be sure to mount parts and arrange the wires

as they were originally!

For safety seasons, some parts use tape, tubes or other

insulating materials, and some parts are mounted away

from the surface of printed circuit boards. Care is also

taken with the positions of the wores omsode amd clamps

are used to keep wires away from heating and high

voltage parts, so be sure to set everything back as it was

originally.

◎

Inspect for safety after servicing!

Check that all screws, parts and wires removed or

disconnected for servicing have been put back in their

original positions, inspect that no parts around the area

that has been serviced have been negatively affected,

conduct an inslation check on the external metal

connectors and between the blades of the power plug,

and otherwise check that safety is ensured.

(Insulation check procedure)

Unplug the power cord from the power outlet, disconnect

the antenna, plugs, etc., and turn the power switch on.

Using a 500V insulation resistance tester, check that the

inplug and the externally exposed metal parts (antenna

terminal, headphones terminal, input terminal, etc.) is

1MΩ or greater. If it is less, the set must be inspected and

repaired.

Many of the electric and structural parts used in the set

have special safety properties. In most cases these

properties are difficult to distinguish by sight, and using

replacement parts with higher ratings (rated power and

withstand voltage) does not necessarily guarantee that

safety performance will be poreserved. Parts with safety

properties are indicated as shown below on the wiring

diagrams and parts lists is this service manual. Be sure to

replace them with parts with the designated part number.

(1) Schematic diagrams ......Indicated by the

mark.

(2) Parts lists ......Indicated by the

mark.

Using parts other than the designated

parts could result in electric shock, ﬁ res

or other dangerous situations.

CAUTION

Concerning important safety

parts

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Denon DP-A100 Service Manual Page 3

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