Troubleshooting guide

Cinematronics Vector Monitor Repair Guide v.1.0
Page 47 of 53
DAC80s
The Burr-Brown DAC80 used in the Cinematronics monitor comes in two "flavors"; the DAC-80-
CBI-V "voltage output", and the DAC-80-CBI-I "current output" type.
All Cinematronics monitors used the voltage version - the DAC-80-CBI-V.
The following are drop in replacements for the DAC-80-CBI-V:
• National Semiconductor DAC1280
• Burr-Brown DAC800-CBI-V
• Burr-Brown DAC800P-CBI-V
• Beckman 7580V (needs some resistors changed)
• Analog Devices ADDAC80N-CBI-V
The Beckman DAC (7580VS) is not directly compatible with the Burr-Brown DAC-80. If using a
Beckman 7580VS, R101 must be changed to 11.0k 1% metal film, and R201 must be changed to
7.5k 1% metal film.
The DAC811 and DAC813 on TI’s website (they bought Burr Brown) look like they could replace
the DAC80 on the Cinematronics board. However, the pinout is different (it has more pins), and
some resistor changes would need to be made on the Cine monitor to get the offsets and gains right.
But at first glance it looks like one of these (if not both) could be made to work as a DAC-80
substitute. Each one has its advantage and disadvantages. But by holding low the WR, LDAC, and
NA, NB, NC, LMSB and LLSB lines, the data lines are passed directly through to the DAC,
making it act like the DAC-80.
Ribbon Cables
Ribbon cable specs and part numbers (AMP _____) If you decide to replace your ribbon cable(s)
you might think about keying each end. For some reason, Cinematronics did not originally key
each connector. This will require the removal of at least one pin from the monitor PCB connector
as well as one pin from the CCPU connector. Read your schematics to determine if this can be
done on your monitor.