User's Manual
3. IF
Bandpass
Adjustment
Table 2-6. Factory-Selected LC Filter Capacitors
1
CC CTR Adjustment Fixed Factory Select Capacitor
A5L300 LC CTR 1
A5C326
A5L301 LC CTR 2
A5C327
A5L700 LC CTR 3
A5C717
A5L702 LC CTR 4
A5C718
Table 2-7. LC Factory-Selected Capacitor Selection
DVM Reading (V)
0 to 1.5
1.5 to 2.5
2.5 to 3.5
3.5 to 4.5
4.5 to 5.5
5.5 to 6.5
6.5 to 7.5
7.5 to 8.5
8.5 to 9.5
9.5 to 10
Replace
6.8 with:
*
18
15
10
8.2
no change
no change
*
*
*
Currentl!
Replace
8.2 with:
*
18
15
12
10
no change
no change
6.8
*
*
Y
Loaded
CaDacitor
Value (pF)
I
Replace
10
with:
*
*
Replace
12
with:
*
*
18 18
15
15
12
15
no change no change
no change no change
8.2
10
6.8
8.2
6.8 8.2
Replace
15
with:
*
*
*
18
18
no change
no change
12
12
10
* Indicates a condition that should not exist; suspect broken hardware.
Replace
18 with:
*
*
*
*
*
no change
no change
15
15
12
XTAL Bandpass Adjustments
13. On the HP
856OA,
press
@ii)
1
m
and
ICAL).
14. Move the positive DVM test lead to
A5TP7.
15. On the HP 8560A, press ADJ CURR IF STATE. Wait for the IF ADJUST STATUS message
to disappear before continuing to the next step.
16. Read the voltage displayed on the DVM. If the voltage is less than
t6.06
Vdc, turn
A5T200
XTAL CTR 1 clockwise. If the voltage is greater than
t6.26
Vdc, turn XTAL
CTR 1 counterclockwise.
17. Repeat steps 15 and 16 until the voltage reads
t6.16
Vdc
flO0
mV.
2-22 Adjustment Procedures