General information
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Job Number |
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0211-67 |
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Equipment type |
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TV |
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Maker + Model # |
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Grundig CUC6300 |
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Made in |
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Date in |
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Nov-05 |
2002 |
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Date of repair |
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Nov-06 |
2002 |
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Date out |
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n/a |
2002 |
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Comments |
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Symptoms observed
BAD |
1 |
Pin cushion distortion (East West
distortion) |
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2 |
Loss of horizontal width (approx 2/3 of
screen) |
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3 |
Fault cures up alone after warming up for 20
mins or so. |
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GOOD |
1 |
All other functions are good |
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2 |
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Repair notes
Full repair description and observations |
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1 |
It was obvious that there was a dry joint
somewhere, and after several searching, there was a nicely hidden one on
capacitor C503, adjecently near the horiz+vert deflection plug (360nF, blue).
Soldering this made the screen to resume its original width, but the
pincushion did not got fixed. |
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2 |
The capacitor, although it gave a steady 359
nF, was
replaced, maybe it was working badly under high voltages. A 330nF capacitor
was replaces, but no effect on the pin cushion distortion. The original
capacitor was soldered back again |
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3 |
After testing several parts, it was found
the there was a fusible(?) resistor – R503 which was
open circuit. The markings were barely visible, but a white, pink/orange,
gold, gold (9.3 Ohms) could be read out. Strangely, when checking the value
on a circuit diagram at Mirald electronics (Grundig shop) the value given was
5.6?? I bouth both 5.6 and 8.2 Ohms (9.3 not available) |
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4 |
When the resistor was replaced (the 8.3 Ohms
one), the pin cushion distortion was cured up amd a full perfectely square raster was
obtained. |
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5 |
Checking the resistor it had 13.5V at the
tuner side and 15V at the LOPTX side and it did not warm up. |
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6 |
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Repair summary |
C503
(360nF) DRY JOINT, R503 (9.2 Ohms) OPEN CIRCUIT |
Precautions, fouls and advises |
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1 |
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Other measurements and technical comments
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1 |
If R503 is o/c – Pin
cushion distortion |
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2 |
If C503 is o/c – loss of
Pictire width (raster becomes 2/3 of screen) |
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3 |
Service mode to adjust
height/linerity and other geometry is 8500 |
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