Service manual

Subject:
Data Sheet Concerned:
Supplement:
Edition:
Advance Information Supplement
Changes to the previous revision are indicated by change bars. Please note section 2.1.1.2., which is of importance
for the use of the VCT-I F1 in combination with NICAM-audio modes.
1. VCT 49xyI Version History
1.1. Field Problems
Field test results are available for the VCT 49xyI versions C7 to D5. The versions F1 and F2 are intended to solve all
listed field problems.
1.2. Functional Problems
For a more detailed description and workarounds of the functional problems please refer to the list of the particular
VCT 49xyI version in the next sections. The problem numbers are consistent throughout the whole document. The
versions F1 and F2 are intended to solve the remaining problems.
Table 1–1: History of field problems
No. Field Problem C7 D2 D4 D5 F1 F2 Comment
FP01 Streaky Noise x x x x Problem solved in F1
FP02 Modulator Imbalance
x x x x Problem solved in F1
FP03 FM Modulation
x x x x Problem solved in F1
FP04 Color Clipping x x x x x Problem to be solved in F2
FP05 Closed Caption Performance
x x x x Problem to be solved in F1
FP06 VSP-AGC performance
x x x x x Problem to be solved in F2
FP07 Sync/H-PLL performance x x x x x Problem to be solved in F2
Table 1–2: History of functional problems
No. Functional Problem C6 C7 D2 D4 D5 F1 F2 Comment
18 Vertical Synchronisation
x x Problem solved in D2
26 Picture Frame Blanked
x x Problem solved in D2
34 Reset after Read x x Problem solved in D2
Additional Info for VCT49xyI
VCT49xyI
6251-573-1AI, Edition Feb. 18, 2004
Version History
Dec. 16, 2004
CIRCUIT DESCRIPTIONS