Philips BM7713 - Page 13

NOTES
1. The DC voltages specified in the circuit diagram are
average voltages. They have been measured while:
- Brightness had been adjusted to minimum and
contrast to minimum.
~ 2. Defective safety resistors must be replaced by the
types specified in the list of electrical parts.
These resistors are labelled with the symbol ==} .
3. When the picture tube is being replaced, safety
glasses must be worn.
4. Safety reguiations require that the receiver be restored
to its original state and that therefore components are
used which are identical with the components
replaced.
5. The semi-conductors, mentioned in the circuit diagram
and the parts list, and the semi-conductors in the
receiver are interchangeable per item in this chassis
irrespective of the type designation on these
semi-conductors.
MECHANICAL INSTRUCTIONS
1. Removing the chassis
— Remove the backcover.
~ Slide out the chassis.
— Remove the screws of the mains transformer so that,
if desired, this can be slid out as well.
- After repair the connecting cables of the chassis
should be fixed in the original way.
ADJUSTMENTS
1. Supply voltage
- Connect a voltmeter to the collector of TS102 (+12).
~ Adjust R106 until the voltmeter indicates 12 V.
2. Horizontal time base
- Short circuit C512/C501 and earth.
- Adjust R517 until the picture is vertical.
-— Remove the short circuit.
3. Focusing
Optimum adjustment of focusing can be realized with
R540.
4. Preliminary brightness adjustment
Apply a signal to the video input.
Brightness control to maximum (R537).
Contrast control to minimum (R615).
Adjust preliminary brightness adjustment R536 until
the flyback lines are just not visible.
—
41498 A12(718)
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