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6-7. TBC-24 Board Replacement
8. TBC Y/C Delay Adjustment
n
Perform this adjustment without using the extension board.
Measuring equipments: Composite waveform monitor
(1) Turn off the power of DNW.
(2) Disconnect the extension harness from TBC-23 board and TBC-24 board.
(3) Remove the TBC-24 board from the extension board, then pull out the extension board.
(4) Insert the TBC-24 board to DNW.
(5) Connect originally harness to CN1 on TBC-24 board and CN1 on TBC-23 board.
(6) Turn on the power.
(7) Set the composite waveform/vector monitor as follows:
WAVEFORM mode, INPUT: CH-A, INT REF, SWEEP : 2 H, MAG: ON
LINE SELECT: 183 to 202 for NTSC
218 to 241 for PAL
METAL adjustment [to step (10)]
(8) Playback the bowtie signal portion (17:00 to 19:00) of the alignment tape CR5-1B or CR5-1B PS.
(DNW-A22: CR5-1B, DNW-A22P: CR5-1B PS)
(9) Observe the 12.5T (PAL: 10T) portion of bowtie signal, adjust so that the waveform satisfies the
specification.
Adjustment points: Field 1: 1RV500/TBC-24(B-1)
Field 2: 1RV504/TBC-24(C-1)
n
RV504 is not equipped on the TBC-24 board of board number suffixes 11 and 12.
Therefore, adjust RV500 only.
Spec.
OK
OK
(10) Eject the alignment tape CR5-1B/CR5-1B PS.
6-104
12.5 T (for NTSC)
10 T
(for PAL)
NG
NG
Y lag
Y lead
behind
chroma
chroma
TBC-24 board (suffix-11 and 12)
RV201
RV200
RV501
RV300
RV500
TBC-24 board (suffix-13 and higher)
RV201
RV501
RV300
RV500
RV504
RV500 and RV504 on TBC-24 Board
RV101
RV101
DNW-A22/A22P
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