UP-5900 (serv.man8). UP5900 Service Manual - Sharp EPOS Service Manual (repair manual). Page 11

UP-5900VS

SERVICE PRECAUTION

3 – 2

The UP-5900 can be externally connected to a keyboard.

The UP-5900’s key BIOS conforms to the PC standard, but this BIOS’s

operation is not compatible for some keyboards.

Some keyboards may cause operation errors due to delicate timing and
conflicts.

It is currently found that the following models of keyboards may mal-

function.

When selecting a keyboard to be connected, test the keyboard in

advance to check that it correctly works.

•  Japanese keyboard (106 keys)

Manufactured by IBM: TYPE/MODEL5576-B01 FRUPN66G0507

•  English keyboard (101 keys)

Manufactured by NMB Technologies Inc.: Model: RT6651T+

When attaching the cover to the power unit, two lead wires (white x 1,
black x 1) of T1A (transformer) in the power unit may be pinched by the
cover, causing a damage to the wiring. (

1

)

To avoid this, push two lead wires of T1A between the radiator fin and
T1A before attaching the cover. (

2

)

■

■

■

■

Procedure 

1

Procedure 

2

T1A

T1A

T1A

1

2

Radiator fin

Radiator fin

Radiator fin

Cover

Add the core to the AC cord GND 
wire for increasing the EMI margin.

Core added: SC18B (RCORF6698BHZZ)

Wind the AC GND wire around 
the core 3 turns (2 windings).

Binding band

Binding position of the 
binding band

Pulling direction of 
the binding band