Block Diagram; Power Voltage - Sharp EL-1607P Service Manual

1. Block diagram

AC Power supply
AC input
transfomer
*
( )BATT.
*
( )ACO only
• MEASURING PIN POSITION
3. Ink roller replacement
If printing is blurry even when the ink roller is in the proper position,
replace the roller.
Ink roller: Type EA-781R-BK (Black)
Type EA-781R-RD (Red)
WARNING:
APPLYING INK TO WORN INK ROLLER OR USE OF UNAP-
PROVED INK ROLLER MAY CAUSE SERIOUS DAMAGE TO
PRINTER.
1. Set the power switch to OFF.
2. Remove the printer cover.
Display tube
VFD DRIVER
KEY/SL-SW
L S I
Circuit
P/H DRIVER PRINTER
Power supply line
Signal line
F2
F2
VDD

2. Power voltage

Measurement point
F1 - F2
VSS - VDD
VSS - VCC
* Measure with the rated AC input voltage.
3. Remove the ink roller by turning it counterclockwise and pulling it
upward.
4. Install the correct color new ink roller and press it in the correct
position. Make sure that the ink roller is securely in place.
Red
EL-1607P Block diagram
– 2 –
Power voltage
4.0 V ~ 4.4 V
AC AC
4.5 V ~ 5.5 V
DC DC
F1
F1
VSS VCC
Black