Sharp MZ-3500 service manual Abnormal test ending, 1 5 c * O DR O.7, Ready O.H

MZ3500

( Check No. 4 )

Border in black

!• "H" in whi

( Check No. 6 ) ( Check No. 7 )

Backroung in red

L "H" in blue

L"H" in green

[• "H" in white

4) Speaker test

Performance of the speaker and the volume control are tested. Listen carefully to detect any abnormal sound or mulfunction. Adjust the volume control to a suitable listen- ing level.

5) Printer interface test

Performance of the printer interface signal lines and action of the 8255 are tested.

[Dispaly]

(1)Normal test ending

PR OK

(2)Abnormal test ending

PR ER

6)Light pen interface test

Performance of light pen interface signal lines and the action of the GDC are tested.

[Display]

On the upper left corner of the screen is displayed character and line.

(1)Normal test ending

LP OK

(2)Abnormal test ending

LP ER

7)RS232C interfacetest

Performance of RS232C interface signal lines and the action of the 8251 are tested.

[Display]

(1)Normal test ending

RS OK

(2)Abnormal test ending

RS ER

( Check No. 5 )

Kff

"H" inred

"H" in green

"H" in white

( Check No. 8	)
Back ground in green	Back ground in black
	}
"H" in blue		H' in blue
"H" in red	}}	H' in red
		H' in green
L- "H" in white	}	• H' ' in white

^n O_ 1 _ 5 c *^ O" 2

RCD

SDR O.7

29

3

2OM 10C

PO O.8

C/ N O. 6

Ready O.H 4

OMrt 3

It will need wiring connection as illustrated in the figure in order to test the RS232C interface. Pins of the RS232C interface edge connector must be wired in the following manner:

Front side

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7 5 3 1

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