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SERVICE BULLETIN
PRODUCT: Computer Monitor BULLETIN: MON 97-009 MODEL: CMB5477L
SUBJECT: Video Pre-amp IC101 (LM1207) Failure
BACKGROUND: IC101 becomes damaged from arcing within the CRT during electronic discharge.
SOLUTION: Add a 300V spark gap in between the G1 grid of the CRT and ground. This will aid in reducing the discharge effect from the CRT.
PARTS LIST: ORIGINAL
Location No.
NA
NEW
Description
NA
Part No.
NA
Part No.
4715-000106
Description
300V, Surge Absorber
Disclaimer: This information is provided "as is" without warranty of any kind either expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.
REV 8-1
SERVICE BULLETIN
PRODUCT: Computer Monitor BULLETIN: MON 97-010 MODEL: CQA4147, CQB4147
SUBJECT: No Raster
BACKGROUND: D618, which is the rectifier diode for the 166V line, burns due to a reverse peak voltage that occurs when power is turned off.
SOLUTION: A snubbing capacitor must be added in parallel with D618 in order to prevent this from occurring. This capacitor should be added to all CQB and CQA chassis as a preventative maintenance.
PARTS LIST: ORIGINAL
Location No.
C643
NEW
Description
NA
Part No.
NA
Part No.
2201-000012
Description
C-CERAMIC DISK, 220pf, 10%, 1KV
Disclaimer: This information is provided "as is" without warranty of any kind either expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.
REV 8-1