Grass Valley 8950DAC - Manual (Page 37)

8950DAC Instruction Manual 37
Service
Service
The 8950DAC Digital to Analog Converter modules make extensive use of
surface-mount technology and programmed parts to achieve compact size
and adherence to demanding technical specifications. Circuit modules
should not be serviced in the field unless otherwise directed by Customer
Service.
If your module is not operating correctly, proceed as follows:
• Check frame and module power and signal present LEDs.
• Check fuse and voltage testpoints ( Figure 16 ).
• Check for presence and quality of input signals.
• Verify that source equipment is operating correctly.
• Check cable connections.
• Check output connections for correct I/O mapping (correct input con-
nector is used for the corresponding channel output).
Refer to Figure 4 for the location of PWR LED and Table 2 on page 12 for
proper LED indications.
If the module is still not operating correctly, replace it with a known good
spare and return the faulty module to a designated Grass Valley repair
depot. Call your Grass Valley representative for depot location.
Refer to Contacting Grass Valley at the front of this document for the Grass
Valley Customer Service Information number.
Figure 16. 8950DAC Fuse and Voltage Testpoints
GRASS VALLEY GROUP 8 9 5 0 D A C 6 7 1 - 4 7 9 8 -
F2A 125V
F2
Solder side
(back)
JP9 JP9
+ 5 V
- 5 V
+ 3 . 3 V
G N D
V o l t a g e T e s t p o i n t s
Fuse
0604_07