HP 83522A - Page 172

ADJUSTMENTS
5-20. ALC ADJUSTMENT (CHANGE 8) (Cont'd)
PROCEDURE:
NOTE
Turn AC power OFF when removing or installing PC boards.
NOTE
This procedure assumes that A3S1 is set to the factory-set position
(Table
5-6).
1. Remove the A5 FM Drive board. Put the A4 assembly on an extender board. Press
[INSTR PRESET] [CW]. Sweep the full range of the plug-in at any leveled power. Preset the
following adjustments as indicated:
A4R81 (OFS 1) ............................................. Midrange
A4R82 (OFS 2) ............................................. Midrange
A4R78 (OFS 3) ............................................. Midrange
A4R15 (GAIN) ............................................. Midrange
A4R7 (0 HI) ............................................... Fully CW
A4R14 (BIAS) .............................................. Midrange
A4R1 (SLP) ................................................ Midrange
2. Float the ground on the Digital Voltmeter and measure the voltage between
A4TP9 and
A4TPlO. Refer to Figure 5-18 for adjustment locations. Adjust A4R81 (OFS 1) for 0.000 a
0.001 Vdc.
A4 R1 A4R7
A4R9
A4R13 A4R14
A4R78 A4R15
(SLP) (0 HI)
(0 MD)
(0 LO)
(BIAS) (OFS3) (GAIN)
A4R81
(OFS 1)
A4 R82
(OFS 2)
Figure 5-18. ALC Adjustment Locations
8-4 CHANGE 8