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E8 CHASSIS SERVICE ADJUSTMENTS
REQUIRED TOOLS FOR SERVICING
Isolation Transformer
Multimeter
Oscilloscope
High Voltage (100:1) Oscilloscope Probe
Sencore VG91 Universal Video Generator
Caution:
The E8 chassis incorporates a "hot" ground system. Always use a separate isolation
transformer when applying power to the exposed chassis.
Service Adjustment Notes:
Unless Otherwise Specified:
1. All service adjustments are "hot" voltagewise. For maximum safety, ensure the use of properly
insulated tools.
2. Refer to the E8 Main Chassis Printed Circuit Board for location of test points and adjustable
components.
3. Grid Locations (Ex.: D-3) next to the reference numbers for components refer to the Main Chassis
Printed Circuit Board.
Focus Adjustment
1. Tune the set to a local or cable station.
2. Adjust the Focus Control (located on the upper part of the flyback transformer) for best picture details
at high light conditions.
Degaussing the Television
1. Position the television so that the screen faces the direction it will be facing when in use.
2. Ensure the set is turned off.
3. Move a degaussing coil in a circular motion slowly around the sides and front of the set.
4. Withdraw the degaussing coil at least six feet from the television before disconnecting it from its
power source.
Service Mode
Introduction
1. There are three service modes used in the E8 chassis. They are:
a.
SDM - Service Default Mode
b.
SAM - Service Alignment Mode
c.
CSM - Customer Service Mode
2. The Service Default Mode (SDM) is a technical aid for the service technician. It is used for setting of
options, reading error codes, and erasing error codes. This mode displays the Run Timer, Software
Version, and current option settings. Service Default Mode (SDM) also establishes a fixed,
repeatable setting of controls to allow measurements to be made. On screen display is kept at a
minimum to reduce the cluttering of wave forms with unwanted information.
3. The Service Alignment Mode (SAM) is used to make tuning adjustments, align the white tone, adjust
the picture geometry, and make sound adjustments.
4. The Customer Service Mode shows error codes and information on the TV operation settings. The
servicer can instruct the customer to enter CSM by telephone and read off the information displayed.
This helps the servicer to diagnose problems and failures in the TV set before making a service call.
5. When in a service mode, "SDM" (for Service Default Mode) or "SAM" (for Service Alignment Mode) or
"CSM" (for Customer Service Mode) will be displayed (in green) in the top right corner of the screen.
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