3-2. PROMPT VIDEO Demodulation Adjustment
3-2. PROMPT VIDEO Demodulation3. Change the output signal from the video signal
Adjustmentgenerator to the 10-step signal.
4. Adjust 1LV2 so that the portion A is flat.
Notes :n
Y This adjustment is necessary only when replacing LV1If the specifications are not satisfied, after performing
on the DM-99 board.Section 3-3. OPROMPT VIDEO RF AGC Adjust-
Y Use a TRIAX cable whose length is 500 m or more forment�, perform this adjustment again.
this adjustment.
Y Use a plastic core driver to adjust 1LV.
Equipment:Oscilloscope, Video signal genera-
tor (provides SWEEP and 10-step
signals)
Preparations :
Y Open the left side panel of the CA-550/550P.
Y CCU-700/700P/700A/700AP setting
S1 (MODE AUTO/MANU)/DM-94 (P-1) ? AUTO
S5 (PROMPT POWER SELECT)/DM-94 (G-8) ? TX
S6 (PROMPT RF SELECT)/DM-94 (M-8) ? TX
Y Feed the SWEEP signal from the video signal generator
to the PROMPTER connector on the CCU rear panel.
Test PointPROMPT connector/CA-550/550P:
Adjustment Points1LV1 (PROMPT FREQ) /:
DM-99 (C-5)
1LV2 (PROMPT TUNE) /
DM-99 (D-3)
Adjustment Procedures:
1. Temporarily adjust1LV2 (D-3) so that the waveform
appears observing the oscilloscope.
2. Adjust 1LV1 (C-5) so that the gain level around 6H rate
MHz is minimum.
Resetting after Adjustment:
Y S1, S5, S6/DM-94 ? customer-set position
V rate
ABCDEFGH
1
2
E1
TP1
3LV2
4RV2RV1
LV1
5
DM-99 BOARD (A SIDE)
3-2 (E)BKP-5971 |
ACEC
