Agilent Technologies 2948, 2712A manual AMPTD, Wave Form, Pin Key Pressed Response lTL

Model 8904A Service

NOTE

Ignore the beeper and the display as keys are pressed. If p i n 8 on A2U4 is always high, a key is probably stuck down.

IC on A2	Pin	Key Pressed	Response (lTL)
u3	17	fl, f2, SHIFT, 7, 2	Goes Low
		All other keys	Always High
u3	15	NEXT, LAST, LOCAL, -, 3, 9	Goes Low
		All other keys	Always High
u3	13	f3, f4, e=,kHz V, deg pV	Goes Low
		All other keys	Always High
u3	11	FREQ, PHASE, 0,5,0	Goes Low
		All other keys	Always High
u3	a	0,AMPTD, WAVE FORM, 6,.	Goes Low
		All other keys	Always High
u3	6	INCR SET, 1,4, Hz rnV, rad ENTER	Goes Low
		All other keys	Always High
ut	12	fl, NEXT, f3, FREQ, AMPTD, 1	Always Low
		All other keys	Always High
u1	13	All keys	Blinks High
u1	14	All keys	Blinks High
u1	15	All keys	Blinks High
u1	16	All keys	Blinks High
u1	17	All keys	Blinks High

2.FLOAT and ON Annunciators Check

On the Multifunction Synthesizer, press SHIFT PRESET. After the instrument presets, key in the sequence indicated listed in the following table. The front-panel annunciators should light as indicated in the table. If the annunciators light improperly, also check the logic level at the point indicated.

NOTE

If the instrument does not have Option 002 (a second output), omit the tests for FLOAT 2 and ON 2.

Troubleshooting (Digital/Keyboard Interface) 8-39