SHARP ETE289 Technical Report

Date: Dec. 16, 1993

ELECTRONIC TYPEWRITER: PA-W1410

1. COUNTERMEASURE AGAINST FD READ/WRITE ERROR

2. CHANGE OF THE MAIN PWB PRODUCER & CORRECTION
OF THE PARTS GUIDE

No. : ETE-289

1. COUNTERMEASURE AGAINST FD READ/WRITE ERROR

1) Model name: PA-W1410, QL-W30/W20

2) General: Ceramic capacitors 1000pF have been added as the countermeasure against FD

READ/WRITE ERROR.

3) Description: • QL-W30 / PA-W1410G

A ceramic capacitor 1000pF has been added at each position between the soldered jumper
wires shown by the arrows in the Fig. 1.
(These capacitors are inserted between TC and +5V of the circuit.)

Fig. 1

Added

SHARP CORPORATION

Printer And Scanner Division

1/4

Orange

C

• QL-W20
A ceramic capacitor 1000pF has been added between the 63th terminal of the IC7
(M50734SP) and the +5V side terminal of C31 shown by the arrows in the Fig. 2.
(This capacitor is inserted between TC and +5V of the circuit.)

Fig. 2

Capacitor C31 +5V
side terminal

Added

IC7 63th terminal

4) Application: From the Aug. production in 1993.

2. CHANGE OF THE MAIN PWB PRODUCER & CORRECTION OF THE PARTS GUIDE

1) Model name: PA-W1410

2) General: The SKC’s production of the main PWB unit for the above model became impossible, and the

main PWB for QL-W30 has been used for assembling at SUKM. The parts codes mistaken in
the parts guide are shown in the attached sheet.

3) Description: All the changed points are shown in the following figures and the parts list.

2/4