Grundig CUC1828 Service Manual Download Page 29

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CUC 1828

Abgleich / Alignment

GRUNDIG Service

2 - 5

Alignment

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 1.2…1.4, 1.7…1.12.1 and 1.15

- horizontal deflection:

alignment 1.12…1.14 and 2.2

Set 143V 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 (optional).

Set

3.3V

0.1V

with

R32033

Set

3.3V

0.1V

with

R27012

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

FI32043

(on the Signal Module).

Set

2.5V

with

R32082

(on the Signal Module).

With the

Ǹ Ƿ

buttons set the values for

and

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

Ǹ Ƿ

buttons set VPC3211A.

The setting is stored when terminating the menu.

With the

Ǹ Ƿ

buttons select P70 169 (Philips) or P82 169

(Toshiba).
The selected type is stored when terminating the menu.

With the

Ǹ Ƿ

buttons optimize differences between Y and

chroma delay (on per-programme basis).
The setting is stored when terminating the menu.

1.1

voltage

1.2 Tuner AGC

1.3 Tuner AGC PIP

1.4 AFC Reference

1.5 Intercarrier

voltage

1.6 PLL demodu-

lator circuit for
38.9MHz
vision carrier

1.6.1PLL demodu-

lator circuit for
33.4MHz
vision carrier
(Multi)

1.7 White balance

1.8 Colourdecoder

1.9 Type of

picture tube

1.10 Colour match

These voltages must strictly be checked and re-adjusted
if necessary after every repair and before every
alignment.

Brightness: Minimum

Feed in a standard test pattern at channel 60 (UHF);
RF = 1.5mV (64dB

V).

Voltmeter: tuner contact 2.

Feed in a standard test pattern at channel 60 (UHF);
RF = 1.5mV (64dB

V).

Voltmeter: tuner contact 2.

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).

Feed in a standard test pattern.
Oscilloscope with anticapacitance test probe (max. 7pF)
to multipoint connector contact 9 of the signal module.

Feed in a standard test pattern with standardized channel
spacing, band 3, with the respective TV standard.
Voltmeter to multipoint connector contact 5 of signal module.

Check and if necessary readjust 1.5
Feed in a standard test pattern with standardized channel
spacing, band 1, French TV standard.
Voltmeter to multipoint connector contact 5 of the signal
module.

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 (

) to mid-position.

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).

With button "