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Mikebetz42 Offline
#1 Posted : Thursday, May 26, 2011 12:03:40 AM(UTC)
Mikebetz42

Rank: Administration

Groups: Administrators
Joined: 1/24/2010(UTC)
Posts: 19
Location: Antelope, CA.

TECHNICAL SERVICE BULLETIN
WELLS GARDNER MONITOR
Model: WGM2792-U0TS09B


This service bulletin addresses the following field reported problems with the current Wells Gardner digital monitor chassis.

Symptoms:

The upper portion of the display shows retrace lines during active video display.
The upper portion of the display appears “Dim” and/or “Washed Out” when compared to the lower portion of the display.
The lower portion of the display shows retrace lines during active video display.
The lower portion of the display appears “Dim” and/or “Washed Out” when compared to the upper portion of the display.
The above listed symptoms appear randomly, often after the unit has been operating for a short amount of time. The symptoms may appear and disappear during normal operation.

Analysis:

The electrolytic capacitors in the vertical sweep circuitry have failed. Symptoms 1 and 2 are a result of C306 (2200uF, 25V) failing. Symptoms 3 and 4 are a result of C314 (2200uF, 16V) failing. Both capacitors are located adjacent to the vertical sweep transistor heat sink. The failure is a result of the electrolytic fluid inside the capacitor boiling and/or out gassing, causing the capacitance to decrease. This boiling and/or out gassing also results in a visual deformation the capacitor case. The deformation is typically exhibited by a “Doming” of the top of the capacitor case.


Resolution:

Remove capacitors C306, C308 and C314. Replace C306 and C314 with new capacitors (2200uF, 25V, 105 degrees C. temp) and C308 (220uF, 50V, 105 degrees C. temp.).

Additional Information:

Contact Wells Gardner via FAX at 1-708-290-2200 to request the capacitor service kit (P.N. S-Kit Cap 2792).
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