Return Video Level Adjustment; Prompt Video Demodulation Adjustment - Sony BVP-500 Maintenance Manual

5-24-13. RETURN VIDEO Level Adjustment

Notes :
• Remove the CN-1232 board in advance referring to
section 5-24 "Notes".
• This adjustment is necessary only when replacing the
DM-98 board.
• Use a TRIAX cable whose length is 1000 m or less for
this adjustment.
Equipment : Waveform monitor
Video signal generator
(provides a 10-step signal)
Preparations :
• Set S1-1 to S1-4/DM-98 (D-2) to all OFF.
• S650 (MONITOR SELECT)/IF-538 panel → RET
• Feed the10-step signal from the video signal generator to
the RET 1 IN connector on the CCU rear panel.
Test Point : MONITOR connector/
BVP-500/500P
Adjustment Point : 1RV1 (RET LEVEL)/DM-98 (D-5)
: A = 1.00 ±0.05 Vp-p
Specifications
Note :
• S1-4/DM-98 → ON
• S650/IF-538 panel → VBS
F E
S1
RV2
RV1
DM-98 BOARD (A SIDE)
BVP-500
BVP-500P
H rate
D C B A
1
E1
2
3
4
5
6
5-24. Video Modulation/Demodulation Adjustment
5-24-13. RETURN VIDEO Level Adjustment

5-24-14. PROMPT VIDEO Demodulation Adjustment

5-24-14. PROMPT VIDEO Demodulation
Adjustment
Notes :
• Remove the CN-1232 board in advance referring to
section 5-24 "Notes".
• This adjustment is necessary only when replacing LV1
on the DM-99 board.
• Use a TRIAX cable whose length is 500 m or more for
this adjustment.
• Use a plastic core driver to adjust 1LV.
Equipment : Oscilloscope, Video signal genera-
tor (provides SWEEP and 10-step
signals)
Preparations :
• 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
• Feed the SWEEP signal from the video signal generator
to the PROMPTER connector on the CCU rear panel.
Test Point : PROMPT connector/BVP-500/500P
Adjustment Points : 1LV1 (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 6
MHz is minimum.
H G F
1
2
E1
TP1
3
RV2
RV1
4
5
DM-99 BOARD (A SIDE)
V rate
E D C B A
LV2
LV1
5-43