Fig. 4.3 Timing Signal Pts (Pin No.39 Of 8049); Adjustment Of Timing Pulse Generating Position - Epson MX-80 Technical Manual

Hide thumbs Also See for MX-80:

Table of Contents

""""'•""""" "pppp"« p"" "i»

P^lse width, be sure to remove the print head

(2) Adjust variable resistor VRI on the driver circuit board by turning it clockwise r,r rn„n

terciockwise so that the specified pulse widths are obtained at the respect ve voUaoes'

shown in Fig. 4.3, when observed with the oscilloscope

respective voltages

P nter frorn the factory. Before adjusting VRi. remove the adhesive with aknife.

Aft6r th© adjustmsnt, be sure to apply Neji Lock #2

4.3.2 Adjustment of timing pulse generating position

When the timing belt motor assembly or PTS sensor board assembly is replaced with anew

one the output position of timing signal PTS may deviate slightly from the original correct

position. Since the MX-80 employs anew method for driving the timing belt motor adiusl thP

(1) Shift the PTS sensor board to the right or left so that one pulse repetition period of the

lo fS 4. 3 ")

I^PPorries approx. 2.08msec. (Refer

•2.08 ms-

Approx. 5V

Fig. 4.3 Timing Signal PTS (Pin No.39 of 8049)

(2) Shift the PTS sensor board to the right or left so that the timing signal (pin No. 39 of the

8049) rises at least 800 /xsec after the trailing edge of signal PRAV (pin No. 28 of the

8049) as shown is Fig. 4.4.

PRAV

—

(Pin No.28 of 8049)

Timing signal

„ ... .

n_ n

(Pin No.39 of 8049)

800 /xsec

min.

Relationship between Timing Signal and Signal PRAV

REV. A

4-5

Table of Contents

Chapters

Table of Contents