TB 9-6625-2293-24
d. Set corresponding switches up or down for indications as listed in (1) through
(4) below:
(1) CH 1 and CH 2 input coupling for 1 M Ω DC.
(2) TRIGGER MODE to AUTO LVL.
(3) TRIGGER SOURCE to VERT.
(4) TRIGGER COUPLING to DC.
e. Position controls as listed in (1) through (8) below:
(1) VERTICAL POSITION controls to midrange.
(2) Horizontal POSITION control to midrange.
(3) TRIGGER LEVEL control to midrange.
(4) TRIGGER HOLDOFF control fully cw to B ENDS A detent.
(5) SCALE ILLUM control fully ccw.
(6) CH 1 and CH 2 VOLTS/DIV switches to 1 00 mV and VAR control fully cw to
detent.
(7) A SWP SEC/DIV switch to 100 μs (knobs locked) and VAR control cw to detent.
(8) INTENSITY, FOCUS, and READOUT INTENSITY controls for suitable
viewing.
17. Power Supply
a. Performance Check
(1) Press VERTICAL MODE pushbutton CH 2 to off.
(2) Connect multimeter LO to chassis ground and HI to TI J119 (fig. 1) pin 4.
If multimeter does not indicate between +9.99 and +10.01 V dc, perform b below.
b. Adjustments. Adjust VOLT REF ADJ R1292 (fig 2) until multimeter indicates
10.00 V DC (R).
18. DAC REF and Input Capacitance
a. Performance Check
(1) Press Δt pushbutton for a Δt display on crt.
(2) Connect multimeter LO to chassis ground and HI to J118 (fig 1) pin 2.
(3) Rotate ΔREF OR DLY POS control ccw until multimeter indication remains at
a constant value (approximately -1.25 V dc). Record indication.
(4) Rotate ΔREF OR DLY POS control cw until multimeter indication remains at a
constant value (approximately 1.25 V dc). Record indication.
(5) Add the absolute values of indications recorded in (3) and (4) above
(approximately 2.500 V).
(6) Subtract the total in (5) above from 2.500 V, then divide the difference by two.
