Instruction manual

130 Concerto — Instruction Manual
Section 4 — Maintenance and Troubleshooting
HD Video Module and Rear Panel Modifications
As of approximately March 2007, HD Video Module 671-6373-01 has been
upgraded to 691-0072-00 and HD Rear Panel 671-6379-00 has been
upgraded to 691-0127-00. These upgrades are designed to improve Output
Amplitude and Input Output Return Loss performance.
• A combination of the new video module 691-0072-00 with the new rear
pa
nel 691-0127-00 is recommended for the optimum performance spec-
ifications.
• The new video module 691-0072-00 will pr
oduce slightly lower Output
Amplitude when paired with the old rear panel 671-6379-00. The
resulting performance will most likely be within SMPTE specifications.
• The old video module 671-6373-01 will pr
oduce slightly higher Output
Amplitude when paired with the new rear panel 691-0127-00. The
resulting performance will most likely be within SMPTE specifications.
Digital Audio Balanced Backplane Transformers
Digital Audio balanced backplanes can be purchased with or without
Output transformers. Figure 82 shows how to determine which backplane
has transformers.
Note All Digital Audio modules have Input transformers.
Figure 82. Digital Audio Balanced Backplane Transformer Identification
8130_00_61r0
GRASS VALLEY GROUP
BALANCE BACKPLANE D-SUB CRS2001
671-6447 –
MADE IN U.S.A.
If the number in the box is:
00 to 49, without transformers
50 to 99, with transformers
Digital Video (SD) 671-6372
-00 A1 to E1 F1
-50 A1 to D1 E1
Table 52. Assembly Part Numbers and Letter Versions
Module Part Number Dash Number
Current Letter
Version
New Letter
Version