Epson LQ 1050 Technical Manual - Page 162

Auto Mode with Oscilloscope, Screen Example

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REV.-A (2) Auto File Mode This mode is selected by choosing No. 2 on the menu screen, and is used to run all of the printer checks sequentially. All of the files shown in Figures 5-5 are executed. This mode is useful in the following cases: q When the cause of the problem can not be determined. q When a final check is performed. q When a check is performed by the user without electronic or mechanical background. q After the unit has been repaired. This mode can be used to find a malfunctioning part without using specific instruments such as an oscilloscope. (3) Auto Mode with Oscilloscope This mode is selected by choosing No. 3 on the menu screen, and is used to identify malfunctions in conjunction with an oscilloscope. This mode can be used when repair is undertaken by a user who is familiar with oscilloscope operation, or when checking specific parts needing repair. The user observes waveforms and voltages on the oscilloscope by following the instructions given on the CRT screen, and inputs the results in YES/NO format. After the checks are finished, the suspected part is displayed on the screen. This mode determines the malfunctioning part at its conclusion. TO CHECK THE REFERENCE VOLTAGE OF A/D CONVERTER: IS THE VOLTAGE LEVEL OF IC7B (CPU) PIN42 ABOUT + 5V?= [NON SYNC: 2V/DIV. OR N(0) ESC/DEL/Fl KEY !1 Figure 5-6. Question Screen (Example) The 2nd line is the question. The 3rd line describes the range of oscilloscope. NON SYNC: Internal Trigger Mode SYNC: External Trigger Mode If the answer is "Yes" then press "Y". If the answer is "No" then press "N". To leave this part of the test press the 'ESC KEY' To return to a previous part of the test press the 'BS or DEL KEY'. To return to the main menu, press the 'F1 key' and 'Enter key' 5-5

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(2)
(3)
REV.-A
Auto File Mode
This mode is selected by choosing No. 2 on the menu screen, and is used to run all of the printer
checks sequentially. All of the files shown in Figures 5-5 are executed.
This mode is useful in the following cases:
When the cause of the problem can not be determined.
When a final check is performed.
When a check is performed by the user without electronic or mechanical background.
After the unit has been repaired.
This mode can be used to find a malfunctioning part without using specific instruments such as
an oscilloscope.
Auto Mode with Oscilloscope
This mode is selected by choosing No. 3 on the menu screen, and is used to identify malfunctions
in conjunction with an oscilloscope.
This mode can be used when repair is undertaken by a user who is familiar
operation, or when checking specific parts needing repair.
The user observes waveforms and voltages on the oscilloscope by following the
on the CRT screen, and inputs the results in YES/NO format.
After the checks are finished, the suspected part is displayed on the screen.
This mode determines the malfunctioning part at its conclusion.
with oscilloscope
instructions given
TO
CHECK THE REFERENCE VOLTAGE OF A/D CONVERTER:
IS THE VOLTAGE LEVEL OF IC7B (CPU) PIN42 ABOUT + 5V?
=
[NON SYNC:
2V/DIV.
OR N(0)
ESC/DEL/Fl
KEY
!1
Figure 5-6.
Question
Screen (Example)
The 2nd line is the question.
The 3rd line describes the range of oscilloscope.
NON SYNC: Internal Trigger Mode
SYNC: External Trigger Mode
If the answer is “Yes” then press “Y”.
If the answer is “No” then press “N”.
To leave this part of the test press the
‘ESC
KEY’
To return to a previous part of the test press the ‘BS or DEL KEY’.
To return to the main menu, press the ‘F1 key’ and ‘Enter key’
5-5