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3. Connect the oscilloscope probe tip [o pin 1 of 208 IC4.
4. Adjust the transfomer 208 Tl until the signal measured is approxi-
mately 2Vpp.
7.13.
.,-/:\
Realignment of Vcoi and VC02
Measuring equipment:
Oscilloscope having an input impedance of 10 Mohms ia parallel with
20 pF or less.
Frequency Counter having an accuracy better than 10-3 and a §ensiti-
vi[y of at least 0..5V.
A
Extension Board
7.13.1. Realigrinent of VC0i:
Control settings:
SUPPLY switch: STANI) BY
1. Connect a §horting lead between teminal 209-32c and comon.
2. Correct the frequency counter becveen 209-22c and coulim.
3. Adjust transformer 209 Tl until the counter reads 23.0 rmz.
4. Rein)ve the shorting lead referred to in (1).
7.13.2. Realignment o£ VC02:
Control settings: SUPPLY switch:
STAND BY
1. Cormect shorting lead betveen terminal 209-2c and comou.
2. Connect the frequency co`mter betveen 209-16c and co-n.
3. i::e:5 £: i:.:=:::its:gv:::I::::;).(A frequetlcy between loo kHz
4. Adjust trang£omer 209 T2 `mtil the co`mter reads 5.0 rmz.
5. :::e;: #: i:.::-£;:::c¥g ¥::a::::S; . (A frequency betveen 10 REz
6. Adjust coil 209 L6 until the counter reads 6.1 mz.
7. :::e:: :: i:.:::;i::t:: ¥::2::::S;. (A frequency betveen 20 rmz
8. Adjust coil 209 L5 until the counter reads 7.1 REz.
9. Remove the short circuit referred to in I.
7.13.3. Realigunent of Phase/Frequency Detectot.1 Error Signal:
Coat:rol settiags:
SUPPI.Y switch: STANI) BY
1. Cormect the oscilloscope tietueen 209-32c and cotnron.
2. Adjust 209 R13 for ninimun puls width.
7.13.4. Realigrment o£ Phase/Frequeticy Detector 2 Error Signal:
Control settings: SUPPLY switch: STANI} BY
Frequeticy Selected:
Greater than I MHz.
7-7
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