Sanyo DVD1451U, Service Manual

2) Read and comply with all caution and safety related 

notes non or inside the cabinet, or on the chassis. 

 
3) Design Alteration Warning-Do not alter of add to the 

mechanical or electrical design of this instrument. 
Design alterations and additions, including but not 
limited to, circuit modifications and the addition of 
items such as auxiliary audio output connections, 
might alter the safety characteristics of this 
instrument and create a hazard to the user. Any 
design alterations or additions will make you, the 
service, responsible for personal injury or property 
damage resulting there from. 

 
4) Observe original lead dress. Take extra care to 

assure correct lead dress in the following areas:   
(1) near sharp edges, (2) near thermally hot parts 
(be sure that leads and components do not touch 
thermally hot parts), (3) the AC supply, (4) high 
voltage, and (5) antenna wiring. Always inspect in 
all areas for pinched, out-of-place, or frayed wiring. 
Do not change spacing between a component and 
the printed-circuit board, Check the AC power 
cord for damage. 
 

5) Components, parts, and/or wiring that appear to 

have overheated or that are otherwise damaged 
should be replaced with components, parts and/or 
wiring that meet original specifications. 
Additionally determine the cause of overheating 
and/or damage and, if necessary, take corrective 
action to remove and potential safety hazard. 

 
6) Product Safety Notice-Some electrical and 

mechanical parts have special safety-related 
characteristics which are often not evident from 
visual inspection, nor can the protection they give 
necessarily be obtained by replacing them with 
components rated for higher voltage, wattage, etc. 
Parts that have special safety characteristics are 
identified by shading, an (

) or a (

) on 

schematics and parts lists. Use of a substitute 
replacement that does not have the same safety 
characteristics as the recommended replacement 
part might created shock, fire and/or other 
hazards. Product safety is under review 
continuously and new instructions are issued 
whenever appropriate. 

1-2 Servicing Precautions 

CAUTION: 

Before servicing Instruments covered by 

this service manual and its supplements, read and 
follow the Safety Precautions section of this manual. 
 

Note: 

If unforeseen circument create conflict between 

the following servicing precautions and any of the 
safety precautions, always follow the safety 
precautions. Remember; Safety First 
 

1-2-1 General Serving Precautions 

(1) a. Always unplug the instrument’s AC power cord 

from the AC power source before (1) removing or 
reinstalling any component, circuit board, module 
or any other instrument assembly. (2) 
disconnecting any instrument electrical plug or 
other electrical connection. (3) connecting a test 
substitute in parallel with an electrolytic capacitor 
in the instrument. 

b. Do not defeat any plug/socket B+ voltage 

interlocks with which instruments covered by this 
service manual might be equipped. 

c. Do not apply AC power to this instrument and/or 

any of its electrical assemblies unless all 
solid-state device heat sinks are correctly 
installed. 

d. Always connect a test instrument’s ground lead 

to the instrument chassis ground before 
connecting the test instrument positive lead. 
Always remove the test instrument ground lead 

last. 

Note:

 Refer to the Safety Precautions section 

ground lead last. 

(2) The service precautions are indicated or printed on 

the cabinet, chassis or components. When 
servicing, follow the printed or indicated service 
precautions and service materials. 

(3) The components used in the unit have a specified 

flame resistance and dielectric strength. 
When replacing components, use components 
which have the same ratings, by (

) or by (

) 

in the circuit diagram are important for safety or 
for the characteristics of the unit. Always replace 
them with the exact replacement components. 

(4) An insulation tube or tape is sometimes used and 

some components are raised above the printed 
wiring board for safety. The internal wiring is 
sometimes clamped to prevent contact with 
heating components. Install such elements as 
they were. 

(5) After servicing, always check that the removed 

screws, components, and wiring have been 
installed correctly and that the portion around the 
serviced part has not been damaged and so on. 
Further, check the insulation between the blades 
of the attachment plus and accessible conductive 
parts. 

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