Abgleich / AlignmentCUC 2030 N � CUC 2080 N
GB Alignment
Note:
The CUC 20xx chassis are either fitted with TDA 8843/8375 or TDA 8843-N2/8844-N2. Type TDA 8843-N2/8844-N2 has a PLL demodulator
integrated in it so that the AFC adjustment in the Service Menu is not necessary.
Attention!
1. After any repair or replacement of NVM (IC82005) check whether the NTSC 3.58MHz quartz is fitted. If it is not, the dialog line "NTSC 3,6" in the
Service Menu must be set to "off".
Button "6" �> "OK" �> "SERVICE" �> "OK" �> Service Code "8500" �> NTSC 3,6 "off" and in dialog line "End" store the setting "with mem.".
2.When no SAT Receiver (SNR 105 microSAT) is connected to the AV1 socket, SAT in the Service Menu is to be set to "off".
Button "6" �> "OK" �> "SERVICE" �> "OK", select dialog line "SAT" and switch to "off".
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, spectrum analyser or RF millivoltmeter
Service works after replacement or repair of the following modules:
- Power supply: alignment 1.1
- Tuner: alignment 1.2, 1.3 / 1.4
- NVM IC82005: alignment 1.2 �1.8, 2.1, 2.2, 3.1, 3.3
- Horizontal deflection: alignment 1.9
AlignmentPreparations Alignment Process
1.1 +A voltageThis voltage must be checked and re-adjusted if necessaryAdjust R60037 or R61313 acc. to the table (page 16) on
after every repair and before every alignment.the power supply circuit diagram.
Brightness: Minimum
Digital voltmeter: Cathode D61016
1.2 Tuner AGCSpectrum analyser or RF millivoltmeter symmetrical toAdjust 102dBmV (360mVpp) with button "V -" or "+ C".
tuner contact 10, 11.
Feed in a standard test pattern or generator via the aerial,Alternatively, without using a spectrum analyser or RF
70�80dB mV.millivoltmeter, adjust the picture with button "V -" or "+ C"
so that noise just appears on the screen. Then reset until
Call up the dialog line "AGC" via "6" (DIALOG CENTER) �> the picture is again free of noise.
"OK" �> SERVICE �> "OK" �> Service Code "8500".
Dialog line "End", terminate "with mem".
1.3 AFC ReferenceFeed in a generator test pattern with vision carrier 38.9MHz,Activate the setting with "OK ".
ca. 120mV to tuner contact 10, 11.Internal adjustment of the PLL demodulator is carried out.
only VST TunerIf an arrow is displayed beside the text after adjustment,
Call up the dialog line "AFC" via "6" (DIALOG CENTER) �> re-adjust the AFC with demodulator filter F33025 until the
"OK" �> SERVICE �> "OK" �> Service Code "8500".arrows disappear. The arrow on the left or right of the AFC
value in the menu indicates the sense of rotation for
adjusting the filter.
Arrow on the right, core of the filter turned in too far.
Arrow on the left, core of the filter turned out too far.
Repeat this adjustment with "OK ".
Dialog line "End", terminate "with mem.".
1.4 AFC ReferenceFeed in a standard test pattern with standardized channelActivate the setting with "OK ".
spacing, band 1 (channel 2�4) without finetuning.Internal adjustment of the PLL demodulator is carried out.
only PLL-TunerIf an arrow is displayed beside the text after adjustment,
Call up the dialog line "AFC" via "6" (DIALOG CENTER) �> re-adjust the AFC with demodulator filter F33025 until the
No adjustment"OK" �> SERVICE �> "OK" �> Service Code "8500".arrows disappear. The arrow on the left or right of the AFC
necessary withvalue in the menu indicates the sense of rotation for
TDA 8843-N2adjusting the filter.
TDA 8844-N2Arrow on the right, core of the filter turned in too far.
Arrow on the left, core of the filter turned out too far.
Repeat this adjustment with "OK ".
Dialog line "End", terminate "with mem.".
1.5 OSDCall up the dialog line "OSD" via "6" (DIALOG CENTER) �> With button "V -" or "+ C" position the menu in the
"OK" �> SERVICE �> "OK" �> Service Code "8500".middle of the picture.
Dialog line "End", terminate "with mem.".
1.6 TubeCall up the dialog line "Tube" via "6" (DIALOG CENTER) �> With button "V -" or "+ C" enter the correct screen
(Type of picture"OK" �> SERVICE �> "OK" �> Service Code "8500".diagonal.
tube)
Dialog line "End", terminate "with mem.".
10GRUNDIG Service |
ACEC
