Grass Valley TTV 1657D - Manuel (Page 129)

Chapter 2 - Camera 129
Description
THOMSON TTV 1657D
User manual
B1657D902C
Septembre 2000
2.1.4 - Matching of C
R
and C
B
signals to BETACAM standard
UER Standard (N10): the peak-to-peak amplitude of the C
R
and C
B
signals is
0.7 V/75 Ohms for a 100/0/100/0 bar pattern (i.e., 0.525 V for a 100/0/75/0 bar pattern).
Normally cameras are delivered to the UER standard.
BETA standard: the peak-to-peak amplitude of the C
R
and C
B
signals is 0.7/75 Ohms for
a 100/0/75/0 bar pattern (i.e.: 0.933 V for a 100/0/100/0 bar pattern).
The matching operation below is to be performed by qualified personnel only.
To match the C
R
and C
B
signals to the BETACAM standard:
• unscrew the 4 screws attaching the left door of the camera,
• remove the "DIGITAL PROCESS" board.
NOTE: Two "DIGITAL PROCESS" PCB versions fit the camera. The 2
nd
versions are
fitted with a daugther PCB.
- PCB version 1 (DP) (without daughter PCB):
On the "DIGITAL PROCESS" board, unsolder the following resistors
(0 Ohm):
- R748 and R752 for C
R
,
- R788 and R792 for C
B
.
- PCB version 2 (DP1 or DP2) (with daughter PCB):
On the "DIGITAL PROCESS" board, unsolder the following resistors
(0 Ohm):
- R255 and R261 for C
R
,
- R328 and R331 for C
B
.