Samsung RM25 Series Specifications download pdf (Page 61)

Plug in again and check for loose

plug.

Check at the SMPS PBA.

- Check Main PCB connection.

- Check the connections between upper

hinge and CABI-door.?

- Check the connections between door

and panel PCB.

DIAGNOSTIC

6-1) If power is not ON

At the power of main PCB, the 115V AC and a high-voltage over DC 170V occur.

Please be careful wih repair and measurement

Is it plugged in?

Is 170V DC applied to both

terminals (+ and -) of BD1?

Is fuse on the SMPS PCB

breaking?

Is 115V AC applied to both

terminals of CN1?

Is the 5.8V DC voltage applied between

C and S of TOP S/W 246Y?

Is 12V applied both

terminals of C16?

Is 5V applied both

terminals of C19?

Does Panel PCB work

normally?

Is the load, such as

of relays and others normal?

Is there any short or

break of PCB soldering?

Normal

Start

To check the main PCB, please see

the “operation descriptions and

references” in the manual.

YES

Check the connection and

assembly of electric wires.

Exchange fuse (AC 250V 2.0A)

YES

Check PCB Pattern and replace

BD1.

Replace PCB Assembly.

1) Replace U4(D10LC20U)

2) Replace SMPS PBA

Replace REG1(KA7805)

1) Check and troubleshoot the

assembly of electric wires.

2) Replace panel PCB.

1) Replace the corresponding relay.

2) Check the contact of lead wire.

Caution!

6060

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Samsung RM25 Series Specifications Page 61

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