TM 11-6625-3053-14
STEP
OPERATION
NORMAL INDICATION
CORRECTIVE ACTION
Set MODULATION switch to CW if sig gen was on, or wait 2 mins before doing so if just energized.
Using digital multimeter, set to 10 VDC range and energize. Set probes between ground on the
tracking board and TP1 (located near Al osc reg ckt card).
Voltmeter should read between 1.8 and 2.1 volts DC. This voltage is across
R14 on the A2A3 card assy and is equivalent to a current reading of
between 18 and 21 mA.
Divide the voltage read by 100 (the value of R14) to obtain between 0.018
and .021 amperes of beam current. This is the same as between 18 and 21
mA.
Adjust A4A1R1 (BEAM CUR-
RENT ADJ) on tracking board for
a current between 18 mA and 21
mA.
T/S item 9.
Glyptol pot shaft to shaft lock after
adjustment.
If alinement ends here:
Deenergize sig gen.
Replace dust cover (para 6-20).
5
TUBE OR TRACKING CIRCUIT COMPONENT.
Remove instrument dust cover if on (para 6-20).
Before frequency alinement, the following alinements must be performed if not already done:
-325V BEAM SUPPLY VOLTAGE ALINEMENT
-750V REPELLER VOLTAGE ALINEMENT
KLYSTRpN FILAMENT ALINEMENT
BEAM CURRENT ALINEMENT
With the sig gen energized and in the RF OFF position, connect simultaneously the rear and front
panel setups as shown in Figure 6-9.
Set up scope for X-Y operation with a 5A48 in the left compartment and another 5A48 in the
horizontal compartment. Set V/Div. to 1 V and adjust as necessary.
6-31