Tektronix THS710A Manual do Utilizador descarregar pdf (Página 119)

Maintenance

THS710A, THS720A, THS730A & THS720P Service Manual

6–37

Use these techniques to troubleshoot other parts of the instrument.

Buttons. Press each of the front-panel buttons to verify that it operates properly.

The table below lists the buttons that depend on a particular instrument state for

you to see an effect when the button is pressed. Unless noted otherwise, the

instrument should be in scope mode for this test.

Button Precondition Expected Behavior

HARD COPY None With no connection to the

RS-232 port, a message

will appear approximately

10 seconds after HARD

COPY is pressed

Any bezel button Press DISPLAY first Displays pop-up menu

CLEAR MENU Press DISPLAY first Removes menu

SCOPE Press METER first Changes to scope mode

/– Rocker Press CURSOR and then

choose Function V Bars first

Cursor moves

TOGGLE Press CURSOR and then

choose Function V Bars first

Changes active cursor

WAVEFORM OFF Press CH 1 first Removes waveform

VERTICAL MENU Press CH 1 first Displays menu

VOLTS/DIV Press CH 1 first Changes sensitivity

VERTICAL POSITION Press CH 1 first Repositions waveform

TRIGGER LEVEL Press CH 1 first Changes trigger level

SET LEVEL TO 50% Adjust TRIGGER LEVEL first Resets trigger level

If any button fails to operate, inspect and/or clean the switch flex-circuit

assembly and the switch mat. If cleaning does not solve the problem, the switch

flex-circuit assembly, switch mat, or main board may be defective. Use the

procedure below to isolate the problem:

1. Replace the switch flex-circuit assembly and then retest the buttons. If the

problem persists, proceed to step 2.

2. Replace the switchmat and then retest the buttons. If the problem persists,

proceed to step 3.

3. Replace the main board.

Other Troubleshooting

1 2 ... 114 115 116 117 118 119 120 121 122 123 124 ... 141 142

Sem comentários

Tektronix THS710A Manual do Utilizador Página 119