Grundig Atlanta SE 7250 PIP/DOLBY Service Anleitung Seite 40

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.
Measuring instruments: Dual-channel oscilloscope, 10:1 test probe, digital voltmeter, colour video generator, spectrum analyzer or RF
millivoltmeter.
Service works after replacement or repair of:
- Chassis: Alignment 1
- Signal Module: Alignment 2, 5, 5.1
- Terrestrial PIP/Signal Module: Alignment 3, 6, 6.1
- IC80095: Alignment 4, 7...11.1 und 15
- Horizontal Deflection: Alignment 12...14
Alignment
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
2. Tuner AGC Connect the spectrum analyzer or RF millivoltmeter
unsymmetrically to tuner contact 10 or 11.
Feed in a standard test pattern without sound carrier or a
generator test pattern via the antenna, 70...80dBµV.
3. Tuner AGC PIP Connect the spectrum analyzer or RF millivoltmeter
unsymmetrically to tuner contact 12 or 13.
Feed in a standard test pattern without sound carrier or a
generator test pattern via the antenna, 70...80dBµV.
4. AFC reference Tune in to a station in Band I (channel 2...4) with standardised
channel spacing without finetuning.
Call up the AFC reference menu with button " " (DIALOG
CENTER) –> "OK" –> "SERVICE" –> "OK" –> "Only for the
retailer" –> "OK" –> Code Number "8500" –> "AFC reference"
–> "OK" –> (menu guide).
Signal Module:
(29504 202 0100,
29504 262 0100)
5. PLL demodu- Feed in a standard test pattern with standardised channel
lator circuit for spacing, Band 3, in the appropriate TV standard.
38.9MHz Voltmeter to multipoint connector contact 5 of the Signal
vision carrier Module.
5.1 PLL demodu- Feed in a standard test pattern with standardised channel
lator circuit for spacing, Band 1, French TV standard.
33.4MHz Voltmeter to multipoint connector contact 5 of the Signal
vision carrier Module.
(multi-IF)
Signal Module:
(29504 212 0200)
6. PLL demodu- Feed in a standard test pattern with standardised channel
lator for spacing, Band 3, in the appropriate TV standard.
38.9MHz vision Voltmeter to IC32110-22; determine the exact operating
carrier voltage UB.
Voltmeter to IC32110-11.
6.1 PLL demodu- Feed in a standard test pattern with standardised channel
lator for spacing, Band 1, French TV standard.
33.4MHz vision Voltmeter to IC32110-22; determine the exact operating
carrier voltage UB.
(multi-IF) Voltmeter to IC32110-11.
2 - 4
Preparations Alignment Process
Set the value as specified in the table (Page 3-3, 3-14) 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 102dBµV (360mV ) with RV adjustment control
pp
R32033 (Signal Module 29504 202 0100, 29504 262
0100).
Set 102dBµV (360mV ) with RV adjustment control
pp
R32122 (Signal Module with Splitter 29504 212 0200).
On activation of AFC Reference a rectified IF-voltage from
the AFC output of IC32010 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. 128±10). Activate with "OK".
Set 2.5V with F32043 on the Signal Module.
Set 2.5V with R32057 on the Signal Module.
Set half the operating voltage UB/2 with F32085 on the
Signal Module with Splitter.
Set half the operating voltage UB/2 with R32334 on the
Signal Module with Splitter.
CUC 1832 / 1930 / 1931
GRUNDIG Service