Chassis Board - Grundig CUC 1836 Service Manual

Abgleich / Alignment
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, 1.4, 1.5, 1.6 or 1.6.1
- PIP modul, tuner: alignment 1.3, 1.11
- IC80065, IC80070: alignment 1.7...1.12.1 and 1.15
- horizontal deflection: alignment 1.12...1.14 and 2.1
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
1.2 Tuner AGC Feed in a standard test pattern at channel 60 (UHF);
RF = 1.5mV (64dB° V).
Voltmeter: tuner contact 1 (3600), contact 2 (3400)
1.3 Tuner AGC PIP Feed in a standard test pattern at channel 60 (UHF);
RF = 1.5mV (64dB° V).
Voltmeter: tuner contact 1.
1.4 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).
1.5 Intercarrier Feed in a standard test pattern.
voltage Oscilloscope with anticapacitance test probe (max. 7pF)
(Multi-ZF/IF) to multipoint connector contact 9 of the signal module.
1.6 PLL demodu- Feed in a standard test pattern with standardized channel
lator circuit for spacing, band 3, with the respective TV standard.
38.9MHz Voltmeter to multipoint connector contact 5 of signal module.
vision carrier
1.6.1PLL demodu- Check and if necessary readjust 1.5
lator circuit for Feed in a standard test pattern with standardized channel
33.4MHz spacing, band 1, French TV standard.
vision carrier Voltmeter to multipoint connector contact 5 of the signal
(Multi) module.
1.7 White balance Feed in a grey scale black/white test pattern with burst.
Set white balance to mid-position.
Contrast ( ) to maximum.
Colour contrast ( ) to mid-position.
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).
1.8 Colour decoder With button " " call up the "Decoder" menu via "DIALOG
CENTER" –> "SERVICE" –> "For authorised dealer" –>
Code Number "8500" –> (menu guide).
1.9 Type of With button " " call up the "Tube type" menu via "DIALOG
picture tube CENTER" –> "SERVICE" –> "For authorised dealer" –>
Code Number "8500" –> (menu guide).
1.10 Colour match With button " " call up the "Colour match" menu via "DIALOG
CENTER" –> "SERVICE" (menu guide).
2 - 6
Preparations
i
) to mid-position.
Alignment Process
Set 143V (PHI 82cm), 145V (VC 84cm) 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.
Set 3.3V 0.1V with R32033 on the Signal Module.
Set 3.3V 0.1V with R27012 on the PIP Module.
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 (on the Signal Module).
Set 2.5V with F32043 (on the Signal Module).
Set 2.5V with R32082 (on the Signal Module).
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 select the colour decoder (VPC3210A
or VPC3211A) fitted to the TV set.
The selected type is stored when terminating the menu.
With the buttons select the type and size of the picture
tube (e.g. "P 70 169" Philips).
The selected type 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.
CUC 1836 / 1929
GRUNDIG Service