Alignment - Grundig Chassis 12.5 Serviceanleitung

Chassis 12.5

Alignment

GB
Start of the Service Mode: Via " " (Dialog Center) –> Service –> "OK" –> Service Code "8500".
End the Service Mode: Press button "TXT".
Measuring instruments: 100MHz oscilloscop with 10:1 test probe, digital voltmeter, colour video generator.
Service works after replacement or repair of the following modules:
- Power supply: alignment 1
- IF: alignment 2
- IC101 (Video IC), EEPROM: alignment 2
- CRT, CRT panel: alignment 6...8
- Deflection: alignment 7
- IC402: alignment 2...5 and 7...8
Alignment
1. +B voltage This voltage must be checked and re-adjusted if necessary
after every repair and before every alignment.
Brightness:
Contrast:
Digital voltmeter:
2. IF Start the Service Mode; call up the dialog line "Video" via
menu 1 (red button) with button
B/G,D/K,I Standard Feed in a standard signal of a TV station. Set fine tuning to
"00" and store it via "OK".
Start the Service Mode; call up the dialog line "AFT38" via
menu 4 (blue button) with button
SECAM LL' Feed in a standard signal of a TV station. Set fine tuning to
Standard "00" and store it via "OK".
Start the Service Mode; call up the dialog line "AFT33" via
menu 4 (blue button) with button
3. Tuner AGC 100MHz oscilloscope: Channel A: Tuner contact 11
Colour video generator: Feed in a colour scale (with
Start the Service Mode; call up the dialog line "AGC" via
menu 1 (red button) with button
4. OSD Start the Service Mode; call up the dialog line "OSD.H" and
"OSD.V" via menu 2 (green button) with button
5. OEM Start the Service Mode; call up the dialog line "OEM" via
menu 1 (red button) with button
6. Screen grid Start the Service Mode; call up the dialog line "SCRN" via
voltage menu 3 (yellow button) with button
Switch on the horizontal line with button
GRUNDIG Service
Preparations
Minimum
Minimum
Cathode D610
.
or .
or .
Ground: Tuner
switched-off sound carrier) via the
aerial: channel 32; 70±1dBµV.
or .
or
or .
or .
or .
Alignment Process
Adjust +B to the values below with P601:
Size CRT
14" A34EAC01X06
20" A48EJW011X21
20" A48ECR43X51
20" A48EKB01X01
21" A51EER33X41
21" A51EFS83X191
21" A51EAL155X01
21" A51EAL135X01
21" A51EAL135X02
21" A51QAE320X67
21" A51EKE01X01
With button set to "NEW".
End the Service Mode.
With button or set the right Hex-value to 78-7C
(e.g.: AFT38 87 79).
End the Service Mode.
With button or set the right Hex-value to 78-7C
(e.g.: AFT33 87 79).
End the Service Mode.
With button or set to the following values:
PAL B/G standard ............................... 820mV
PAL/SECAM B/G/D/K standard ......... 820mV
SECAM L/L' standard ......................... 450mV
PAL I standard .................................... 500mV
End the Service Mode.
With button or position the picture to the center of the
. screen. End the Service Mode.
With button or set to "off".
End the Service Mode.
With "SCREEN" control (lower control at the splitter
transformer) adjust the line so that it is just well visible.
Abgleich / Alignment
Voltage Value
105V
116V
118V
119V
118V
110V
115V
115V
115V
118V
115V
±
20mV
pp pp
±
20mV
pp pp
±
20mV
pp pp
±
20mV
pp pp
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