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CUC 1825 / 1826
Alignment
GB
All adjustment controls not mentioned in this description are pre-set at the factory and must not be re-adjusted in the case of repairs.
1. Chassis Board
Measuring instruments: Dual-channel oscilloscope, 10:1 test probe, digital voltmeter, colour video generator.
Service works after replacement or repair of the following modules:
- Chassis: alignment 1.1
- Tuner, IF amplifier: alignment 1.2, 1.3, 1.4, 1.5.1 or 1.5.2
- IC80065, IC80070: alignment 1.6 ...1.11 and 1.13 ... 1.14
- horizontal deflection: alignment 1.11...1.13 and 2.2
Alignment
1.1 +A voltage
These voltages must strictly be checked and re-adjusted
+B voltage
if necessary after every repair and before every
+F voltage
alignment.
+H voltage
+N voltage
Brightness: Minimum
+Q voltage
(optional)
1.2 Tuner AGC
Feed in a standard test pattern at channel 60 (UHF);
RF ≥1.5mV (64dBµV).
Voltmeter: tuner contact 2.
1.3 AFC Reference
Tune to a station in band I (channel 2...4) with standardized
channel raster and without fine tuning.
With button " " call up the "AFC reference" menu via "Dialog
Center" –> "Service" –> "for authorised dealer" –> "Code
Number 8500" –> (menu guide).
1.4 Intercarrier
- Feed in a standard test pattern.
voltage
- Oscilloscope with anticapacitance test probe (max. 7pF)
to multipoint connector contact 9 of the signal module.
1.5.1 PLL demodu-
- Feed in a standard test pattern with standardized
lator circuit for
channel spacing, band 3, with the respective TV
38.9MHz
standard.
vision carrier
- Voltmeter to multipoint connector contact 5 of signal module.
1.5.2 PLL demodu-
- Check and if necessary readjust 1.5.1.
lator circuit for
- Feed in a standard test pattern with standardized
38.9MHz
channel spacing, band 1, French TV standard.
vision carrier
- Voltmeter to multipoint connector contact 5 of the signal
(Multi)
module.
1.6 White balance
- Feed in a grey scale black/white test pattern with burst.
- Set white balance to mid-position.
- Contrast (
- Colour contrast (
- Screen brightness (
- Switch off "Perfect Clear" (red key –> Picture settings
–> OK Personal).
With button " " call up the "White bal." menu via "Dialog
Center" –> "Service" –> "for authorised dealer" –> "Code
Number 8500 –> (menu guide).
1.7 Bottom flutter
Connect a video recorder and play back the recording.
gate
With button " " call up "Bottom flutter gate" menu via "Dialog
Center" –> "Service" –> "for authorised dealer" –> "Code
Number 8500" –> (menu guide).
1.8 Type of
With button " " call up the "Tube type" menu via "Dialog
picture tube
Center" –> "Service" –> "for authorised dealer" –> "Code
Number 8500" –> (menu guide).
1.9 RGB sync
With button " " call up the "RGB-Sync. level" menu via
level
"Dialog Center "–> "Service" –> "for authorised dealer" –>
"Code Number 8500" –> (menu guide).
1.10 Colour match
With button " " call up the "Colour match" menu via "Dialog
Center" –> "Service" –> "for authorised dealer" –> "Code
Number 8500" –> (menu guide).
GRUNDIG Service
Preparations
{
) to maximum.
i
) to mid-position.
v
) to mid-position.
Alignment Process
Set 135V (63, 70 cm) or 140V (72cm) with R61313.
Set 12V on contact 36 of the Feature Box with R61031.
Set 5V on contact 9/10 of the Feature Box with R61041 .
Set 5V on contact 8 of the Feature Box with R61001.
Set 5V on contact 32/33 of the Feature Box with R61051
.
Adjust R61007 to 8.5V ± 0.3V.
±
Set 3.3V
0.1V with R32033.
On activation of AFC Reference a rectified IF-voltage from
the AFC output of IC32040 is measured at the multipoint
connector, contact 5, of the signal module which is used
on station search or for VCR-RF playback (station
identification "AV") as a comparative value to readjust the
modulator drift (typ. 127±10). Activate with "OK".
Set 580mVpp with R32252.
Set 2.5V with FI32043.
Set 2.5V with R32082.
With the
buttons set the values for VG and VB so that
the white area becomes achromatic.
Use the "?" key to call up the default values stored in
EPROM IC80060.
The setting is stored when terminating the menu.
With the
buttons adjust for minimum flutter at the top
or bottom picture edge.
The setting is stored when terminating the menu.
With the
buttons select P63, P70 or P72.
The selected type is stored when terminating the menu.
In RGB operation it is possible to set the RGB level to "on"
or "off" with the buttons
to eliminate line tearing in this
mode. The setting is stored when terminating the menu.
With the
buttons optimize differences between Y and
chroma delay (on per-programme basis).
The setting is stored when terminating the menu.
Abgleich / Alignment
2 - 5
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