GRUNDIG CUC 1982 Service Manual
1GRUNDIG CUC 1982
Matrix
Item See Model Book
X-Ray Precautions(See Notes)........................................... Grundig G1000 Chassis 4
Service Notes (See Notes). ................................................... Grundig G1000 Chassis 4
AF Amplifier .................................................................................... Grundig CUC 7851 5
IF Amplifier ...................................................................................... Grundig CUC 7861 5
Remote Control .............................................................................. Grundig CUC 6360 5
Recommended Safety Parts
Item Part No. Description
CUC 1951
C 7 8531-505-221 MKT 680PF 20% 12,5KV
C 530 8660-098-219 SI-KERKO B-SS 220PF 20%
C 621, C 622 8660-098-238 SI-KERKO B-SS 2200PF 20%
C 665 8660-098-234 SI-KERKO B-SS 1000PF 20%
D 545 8309-215-045 DIODE 1 N 4148
K 536 29305-119,14 KASKADE BG 2034 642 3206
OK 636,OK 646 8306-000-012 OPTOKOPPLER CNY 17 F1
R 337 8705-279-107 MOW AX 0922-GA 27 KOHM
R 355 8766-302-087 MSW AX 0207 3,9 KOHM
R 371 8701-118-001 KSW SI B 1 OHM 5% -GA
R 408 8765-098-207 MSW AX 0207-GA 2 OHM
R 409 8765-098-208 MSW AX 0207-GA 1,8 OHM
R 414 8765-097-009 MSW AX 0204-GA 2,2 OHM
R 501 8705-221-225 MOW AX 0411-GA 10 OHM
R 502 8705-279-001 MOW AX 0922-GA 1 OHM
R 504 8735-064-039 DRW 4 39 OHM 5% STANDBY, 18
R 523 8705-269-065 MOW AX 0617-GA 470 OHM
R 524 8735-003-022 DW 0,22 OHM 10%
R 525 8735-003—33 DW 0,75W 0,33 OHM 10%
R 527 8730-280-021 DRWS11 7W 6,8 OHM
R 528, R 534 8705-221-225 MOW AX 0411-GA 10 OHM
R 551, R 552,R 553 8705-610-133 MOW AX 0617 330 KOHM 5%
R 571 8701-230-817 NKS 3 4,7 OHM 5% ROE
R 572, R573 8700-007-405 KSW AX 0207-GA 1,5 OHM
R 576 8705-269-015 MOW AX 0617-GA 3,9 OHM
R 577 8735-003-273 DRW 0,75W 1 KOHM 10%
R 622 8730-199-005 DRW 11ST 1,5 OHM 5% V3
R 623 8705-329-127 MOW LI 0411 180 KOHM 5%
R 663 8705-369-113 MOW LI0617 47 KOHM 5%
R 665 8766-349-155 MSW LI 0414 2,7 MOHM
R 667 8735-002-013 DRW 2 W 0,1 OHM 10%
R671 8705-329-321 MOW LI 0411 100 KOHM 10%
R 689 8705-369-079 MOW LI 0617 1,8 KOHM 5%
SI 331 8315-618-200 LOET-SI.-GR 1A/T
SI 630 8315-621-027 LOET-SI.-GR 2,5 A/T
SI 651, SI 661 8315-622-025 LOET-SI.-GR 3,15 A/T
SI 671 8315-623-008 LOET-SI.-GR 4 A/T
SI 6111 8315-613-027 LOET-SI.-GR 400 MA/T
TR 8 29201-447.97 FOKUSIERUEBERTRAGER
TR 501 09245-812.31 TREIBER-UEBERTRAGER
TR 526 29201-025.17 ZEILENTRAFO KPL
TR 651 29201-402.97 SPERRWANDLERTRAFO KPL
TR 6111 29201-385.97 UEBERTRAGER EF20
CUC 1982
C 530 8660-098-219 SI-KERKO.B-SS 220PF 20%
C 621, C 622 8660-098-238 SI-KERKO B-SS 2200PF 20%
C 665 8660-098-234 SI-KERKO B-SS 1000PF 20%
C 6001 8511-793-047 MP 3 0,47 UF 20% 250VW
D 545 8309-215-045 DIODE 1 N 4148
K 536 8324-800-326 KASKADE BG 2034 642 3206
L 6001 29500-820.97 FUNKENTSTOERDROSSEL
OK637, OK646 8306-000-012 OPTOKOPPLER CNY 17 F1
R 337 8705-279-107 MOW AX 0922-GA 27 KOHM
R 355 8766-302-087 MSW AX 0207 3,9 KOHM
R 371 8701-118-001 KSW SI B 1 OHM 5% -GA
R 407 8765-044-049 MSW AX 0414-GA 100 OHM
R 408, R 409 8765-198-006 MSW 0207 1,6 OHM 1% TK 50
R 414 8765-097-009 MSW AX 0204-GA 2,2 OHM
R 501 8705-221-225 MOW AX 0411-GA 10 OHM
R 502 8705-279-001 MOW AX 0922-GA 1 OHM
R 504 8735-064-039 DRW 4 39 OHM 5% STANDB. 18
R 523 8705-269-065 MOW AX 0617-GA 470 OHM
R 524 8735-003-022 DW 0,22 OHM 10%
R 525 8735-003-033 DW 0,75W 0,33 OHM 10%
R 527 8730-280-021 DRWSI 7W 6,8 OHM
R 528, R 534 8705-221-225 MOW AX 0411-GA 10 OHM
R 551, R 552,
R 553 8705-610-133 MOW AX 0617 330 KOHM 5%
R 571 8701-230-817 NKS 3 4,7 OHM 5% ROE
R 572, R 573 8700-007-405 KSW AX 0207-GA 1,5 OHM
R 576 8705-269-015 MOW AX 0617-GA 3,9 OHM
R 577 8735-003-273 DRW 0,75W 1 KOHM 10%
R 622 8730-199-005 DRW 11 ST 1,5 OHM 5% V3
29304-050.97 Mains Interference Unit
09621-113.02 Fuse Holder
Recommended Safety Parts Cont’d.
Item Part No. Description
R 623 8705-329-127 MOW LI 0411 180 KOHM 5%
R 663 8705-369-113 MOW LI 0617 47 KOHM 5%
R 665 8766-349-155 MSW LI 0414 2,7 MOHM
R 667 8735-002-013 DRW 2 W 0,1 OHM 10%
R 671 8705-329-321 MOW LI 0411 100 KOHM 10%
R 689 8705-369-079 MOW LI 0617 1,8 KOHM 5%
R 6009 8311-200-010 DUO-PTC
SI 331 8315-618-200 LOET-SI.-GR 1 A/T
SI 630 8315-617-006 FS.2,5 A/T L 250V
SI 651, SI 661 8315-622-025 LOET-SI.-GR 3,15 A/T
SI 671 8315-623-008 LOET-SI.-GR 4 A/T
SI6001 8315-622-503 FS.3,15 A/T H 250V
SI6111 8315-613-027 LOET-SI.-GR 400 MA/T
TR 8 29201-447.97 FOKUSIERUEBERTRAGER
TR501 09245-812.31 TREIBER-UEBERTRAGER
TR526 29201-025.17 ZEILENTRAFO KPL
TR651 29201-402.97 SPERRWANDLERTRAFO KPL
TR6010 09032-301.02 NETZTRAFO
WW. 29201-601.97 TRAFO NETZ
TR6111 29201-385.97 UEBERTRAGER EF20
WW. =Optional
M 70-169/9
C 6001 8511-793-047 MP 3 0,47 UF 20% 250VW
C 6002 8511-793-033 MP 3 0,22 UF 20% 250VW
L 6001 29500-820.97 FUNKENTSTOERDROSSEL
R 6009 8311-200-010 DUO-PTC
SI 6001 8315-622-003 FS.3,15 A/T L 250V
TR6010 09032-301.02 NETZTRAFO
WW. 29201-601.97 TRAFO NETZ
WW. = Optional
M 82-169/9
R 6000 8765-049-157 MSW AX 0414-GA 3,3 MOHM
09246-188.31 Degaussing Coil
09246-188.71 Degaussing Coil
8300-066-697 Pict. Tube W 66 KZA 696X99
29305-165.04 Power Switch Unit
29703-291.32 Power Switch
29303-452.02 Mains Plug Lower Part
09621-113.02 Fuse Holder
8290-991-307 Power Cable
09246-120.71 Degaussing Coil
8300-076-690 Pict. Tube W76 KYR 690X96
29303-452.02 Mains Plug Lower Part
29703-291.32 Power Switch
8290-991-307 Power Cable
Service Adjustments
Service and Special Functions
1: Switching-on Options
Initialisation of the µP (IC850)
Connect Pin 1 of the processor to chassis and
switch the TV on with the mains switch to load
the EEPROM in the processor IC850.
Display: “CONFIG” bzw “CO”.
After replacement of IC840 the ATS (see ATS
EURO Plus) must be re-started.
Loading the Average Values/Emergency Data
(ROM Data)
If µPIC850 fails (is replaced) or the data has
been changed, the TV receiver must be
switched on with the emergency data set.
Mains button “ON” and press the P- button on
the local keyboard simultaneously —> ROM
data are loaded. In doing so the following data
are read out from IC860:
- white value blue, green and white balance.
picture geometry and deflection.
- TV set up (switching on with programme / AV,
frequency-channel mode, PIP frame colour,
PIP position).
- national identification of the location.
- volume offset.
- last programme.
- analog average values and the Luminance
Delay (“0”) and loaded into RAM memories of
IC850.
Having entered the individual values via the
Info. Menu they will be stored automatically
when switching off (see alignment).
ATS Reset
Mains button “ON” and press the L+ button on
the local keyboard.
- default values are loaded.
- either optimum analog values of the factory
- or, analog values from the EPROM.
- This option activates the ATS function
- Black Stretch on (if provided)
- Cinema Picture Format.
ATS Start
Pressing the button “P/C” (for approx. 4 secs.)
—> and confirming “Restart” or “Update” with
“OK” —> starts the Auto Tuning System (ATS).
The ATS-system determines the VPS-signal for
the station identification. Additionally, for the
programmes 1 - 99, the volume offset is reset
and the optimum values, Colour Match and
Picture Sharpness are stored together with the
Peri-bit for the respective country.
I2C-Bus, IC Test, (for fault finding in the I2C-Bus)
These error messages refer only to interference’s in the I2C-bus, that is modules which do
the next time the receiver is switched
on. The previously stored programmes
(channels) are cancelled.
not return an Acknowledge bit via the I2C-bus.
For example no operating voltage present on
the module, break in the circuit path or defective
I2C-interface.
Service-Mode Programme for Sets with
Display
Mains button “ON” and press the P+ button on
the local keyboard simultaneously = I2C-Bus
Test.
With this diagnostic programme the microprocessor in the control unit interrogates the
modules connected to the I2C-Bus and indicates
defective modules by an error message or a
code number on the display and LED, respectively.
List of Error Messages and Code Numbers:
Interface Error Code Defective Module
NVM Control Unit E0, E1,E2, E3 IC840, Control Unit
Box DDC E4 IC1410, Feature Box
Box MSC E5 IC1455, Feature Box
Box CSG E6 IC1430, Feature -Box
Box PP E7 IC1550, Feature-Box
Box DP E8 IC1560, Feature-Box
Colour Dec RGB Chip E9 IC5122, Video Module
IF Stereo Sound IC EA IC2250, IF Amplifier
TDA 8443 EC IC5021, Video Module
TDA 9160 EE IC5001, Video Module
ATA Tuner PLL EF CIC2140, Tuner
Tuner NVM EH CIC2100, Tuner
Audio Matrix EL IC7560, Socket Board
TEA6420
Video Matrix EP IC7660,
TEA6415 Socket Board
The L+ button can be used to discover other
defective interfaces.
Service-Mode Programme for sets without
Display
Mains button “ON” and press the P+ button on
the local keyboard simultaneously = I2C-Bus
Test.
In this fault finding programme, the microprocessor on the tuning module (control unit) scans
the individual modules connected to the I2C-Bus
and indicates them as countable pulse sequence (see fig 1).
1:Connect a double-beam oscilloscope to I2C-
Bus, trigger “SCL” on the oscilloscope.
2:Press and hold P+ on the keyboard and
switch on with the mains button. The number
of clock pulses indicates the defective module
as shown in the table. If there is no fault in the
I2C-Bus communication the pulses SDA and
SCL cannot be synchronised on the screen.
Interface Number Defective
of Clocks Module
NVM Control Unit 1, 2, 3, 4 IC840, Control Unit
Box DDC 5 IC1410, Feature-Box
Box MSC 6 IC1455, Feature-Box
Box CSG 7 IC1430, Feature-Box
Box PP 8 IC1550, Feature-Box
Box DP 9 IC1560, Feature-Box
Colour Dec RGB Chip 10 IC5122, Video Module
IF Stereo Sound IC 11 IC2250, IF-Amplifier
TDA 8443 12 IC5021,V ideo Module
TDA 9160 13 IC5001, Video Module
ATA Tuner
PLL 14 CIC2140, Tuner
Tuner NVM 15 CIC2100, Tuner
Audio Matrix 16 IC7560, Socket Board
TEA6420
Video Matrix 17 IC7660, Socket Board
TEA6415
2: Settings via the Info. Centre Menu
Programme Lock (security system)
You can cancel your personal code number by
pressing + , - , , sequentially.
EPROM Version Number
The version number can be called up in the
Menu Info. Centre with the “AUX” button. The
index 01 of the part number (19798-277.01)
indicates the EPROM version.
Switch on with Programme “1” or “AV”
Via the Menu Info. Centre —> Special Functions
—> Settings programme —> AV. When switching power “On”, programme position “AV” has
priority.
On-Place/Two-Place Programme Selection
Via the menu Info Centre —> Special Functions
—> Settings Programme selection can be
switched over between 1 - 9 and 1-99.
Volume Offset
Via the Menu Info. Centre —> Special Functions
—> Settings —> the “Volume” level can be
changed in 16 steps on a pre-programme basis.
Colour Match
Via Menu Info. Centre —> Special Functions —>
Settings —> the “Colour Match” can be changed
in 8 steps on a pre-programme basis.
Station Ident
Via the Menu Info. Centre —> Special Functions
—> Settings —> the station ident can be
switched off, displayed for a short period or
continuously on the screen.
OSD-ON/OSD/OFF for all Programmes
The on screen display can be switched “on” or
“off” via the Menu Info. Centre —> Special
Functions —> Settings —> Pict/Sound Options.
When selecting the “off” option the scales for the
analog values is switched off.
RGB-Sync-Level
Via the Menu Info. Centre —> Special Functions
—> Settings —> the RGB-Sync-Level can be
changed to On or Off.
PIP-Menu
Via the Menu Info. Centre —> Special Functions
—> Settings —> the frame colour and small
picture position can be selected.
Maximum Programme Number
Via the Menu Info. Centre —> TV-Station Table
—> OK. When storing the channel number “00”
at any programme position, programme
selection with the , , buttons is limited to the
numbers lower than this position.
3: Settings via the Audio Menu
Hi-Fi-output off, linear, controlled
Via Audio Menu —> Hi-Fi-output and the - / +
buttons the AF at the Hi-Fi-output can be:
- switched “off” normal operation.
- set to “var”, the volume level of the
Hi-Fi system can be varied via the
remote of the TV. The loudspeakers in
the TV receiver are switched off in
GRUNDIG CUC 1982
2
Service Adjustments Cont’d
this case.
- switched to “lin”, the volume level of
the Hi-Fi-system is constant.
Switching Over the Sound: Stereo, Mono,
FM, NICAM, NICAM B
Select Audio Menu —> Sound. With the - +
buttons switch the stereo decoder over to the
desired reception.
FM - sound stereo broadcast:
- switchable between Stereo <—> Mono.
- Two-channel sound: switchable
between Mono A <—> Mono B.
The sound for the loudspeakers and headphones can be switched over independently of
each other.
NICAM - sound mono broadcast:
- switchable between NICAM-Mono
<—> FM
NICAM - sound stereo broadcast:
- switchable between NICAM-Stereo
<—> FMo
NICAM - sound dual-sound broadcast:
- switchable to NICAM-sound 1 —>
NICAM-sound 2 —> FM
NICAM not relating to the picture:
- switchable to NICAM-sound 1 —>
NICAM-sound 2 —> FM- preferred
sound is FM-Mono
AV mode
- Stereo (preferred setting) —> Mono A
—> Mono B.
- With the options Sound 1 and Sound
2, the sound for the loudspeakers and
headphones can be switched over
independently of each other.
Headphones dual-sound broadcast:
- switchable between Sound 1 <—>
Sound 2
Fig 1.
4: Settings via the Station Ident
Settings entered in the station identification
effect forced switching of the TV set to an
operating mode; as a result, the automatic
evaluation function is suppressed.
Select the Menu Info. Centre —> TV-Station
Table.
Activate the desired TV station and enter a
comma at the 4th place from the left. The places
5 and 6 are reserved for the actual switching
information (see table).
The first three places (from the left) of the
station ident may be filled with any characters.
Example: ARD, MO only mono sound.
The final setting of the station ident shows only
the first three places, the switching information
will not be indicated.
Indication: ARD.
Possible switch settings:
station ident XXX, MO -> forced mono
station ident XXX, 2T -> sound 2 select (preferred
with dual-sound broadcasts)
station ident XXX, AF -> AFC- Nachregelung aktiv
station ident XXX, AV -> VCR time constant and AFC
Senderkennung AV... -> VCR time constant and AFC
station ident XXX, P5 -> 50Hz
station ident XXX, N5 -> 50Hz
station ident XXX, S5 -> 0Hz
station ident XXX, P6 -> 60Hz
station ident XXX, N6 -> 60Hz
station ident XXX, S6 -> 60Hz
5: Settings via the “AUX” Function
The “AUX” command initialises an input mode in
which certain commands are interpreted
differently. This mode remains active for about 4
secs. unless another command is entered. The
indication “AUX” is shown on the screen for
about 4 secs.
Setting the Peri Bit
“AUX” —> 0/AV.
With the Peri Bit set, the control processor
evaluates the switching voltage on Pin 8 of the
EURO-AV socket AV1 (black) and switches the
TV receiver to this input, (eg. on descrambler
operation).
The Peri symbol illuminates in the display of the
keyboard unit.
Switching over the Descrambler
Descrambler off
Descrambler on Auto (Peri Bit set)
Descrambler on Stereo (Peri Bit set)
Descrambler on mono - L (Peri Bit set)
Descrambler on mono - R (Peri Bit set)
Copy Function
In operating mode:
Firstly select the AV signal source, eg. AV1, AV2
etc.
- ON: “AUX” —> 0/AV (indication “Copy On”)
- OFF: “AUX” —> 0/AV (no indication)
Copying possibilities from —> to:
- AV1 (black Scart socket) —> AV2
(orange Scart socket).
- AV2 (orange Scart socket) —> AV1 (black
Scart socket).
- AV3 (S-Video and Cinchbuchse) —>AV2
(orange Scart socket).
- AV3 (S-Video and Cinchbuchse) —>AV1
(black Scart socket).
Headphone Volume Control
The headphone volume level can be changed
by ““AUX”” —> - +.
Switching between Mono —> Stereo Sound
“AUX” —> activates the sound switching
function: Mono —> Stereo —> Mono A —>
Mono B etc.
6: IR-Data Programmer
With this menu and the IR-Data Programmer 2,
it is possible to store a maximum of 99 programme positions with the data for the channel,
TV norm, Peri, 6-place station identification, the
fine tuning centre frequency and the volume
offset “0”.
The Programmer AP transfers only channels
and 4-place station identifications with fine
tuning centre frequency and volume offset “0”.
Call up via the Menu Info. Centre —> Special
Functions —> IR-Data Programmer.
Attention: The data transfer can be affected by
interference’s from electrical lighting fixtures.
7: Setting the Analog Values
When exceeding the minimum possible values
for the brightness, colour contrast, B/W-contrast
and volume level as specified in the table below,
the appropriate optimum value is initialised
when switching the TV on or changing from RF
—> AV.
Minimum Optimum
Value Value
Brightness 15 31
Colour contrast 11 32
B/W contrast 15 31
Volume 11 11
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.
Service works after replacement or repair of the
following modules:
Chassis: alignment 1.1
Tuner, IF amplifier: alignment 1.2, 1.3
Display/Control Unit: alignment 1.2...1.13
Video Module: 1.5
1.1: Alignment:
+A voltage
+B voltage
+N voltage
+F voltage
Preparation
Brightness: Minimum
These voltages must be checked after every
repair and before every adjustment.
Alignment Process
Set control R654 to 150V.
Set control R673 to 12V on contact 36 of the
Feature-Box.
Set control R683 to 5V on contact 32/33 of the
feature-Box.
Set control R697 to 5V on contact 9/10 of the
Feature-Box.
1.2: Alignment
Tuner-AGC Automatic
Preparation
Feed in a standard test pattern in the upper
range of the UHF band; the RF must be ≥1.5mV
(64dBm V, noise-free picture) at least.
Infocenter —> Special Functions —> Service —
> Code 8500 —> Tuner AGC —> Automatic.
Alignment Process
The control processor IC850 will set the
optimum value for the delayed gain control
voltage. Activate with button “OK”.
1.2 (ii): Alignment
Tuner-AGC Manual.
Preparation
Feed in a standard test pattern in the upper
range of the UHF band; the RF must be ≥1.5mV
(64dBm V, noise-free picture) at least.
Infocentre —> Special Functions —> Service —
> Code 8500 —> Tuner-AGC —> Manual.
or
Digitalvoltmeter: Tuner-Contact 9.
Alignment Process
Press “OK”. With buttons - + tune the TV station
so that noise just starts to appear on the picture.
Then tune in reverse direction until the picture
just becomes noise free. Store with “OK”
With buttons - + adjust ≥3.3V.
1.3: Alignment
(i) AFC-Reference Automatic
Preparation
Infocentre —> Special Functions —> Service —
> Code 8500 —> AFC-Reference Æ Automatic.
Tune to a local station on a channel as low as
possible at the desired programme position with
standard channel spacing without fine tuning.
Alignment Process
On activation of AFC Reference Automatic a
rectified IF-voltage is measured at the AFC
output of the IF amplifier which is used on
station search as a comparative value for VCRHF playback (station identification “AV”) to
readjust the modulator drift.
Activate with “OK”
(ii): AFC-Reference Def. Value.
Preparation
Not for Servicing.
Alignment Process
The AFC Reference Def. Value contains only
average values stored during production.
1.4: Alignment
Text RGB-Level
Preparation
Infocentre —> Special Functions —> Service —
> Code 8500 —> Text RGB-Level.
Alignment Process
Change the value with buttons - + to “Full level”
or “Half level”.
1.5: Alignment
White balance.
Preparation
Black Stretch “off” (Picture Menu).
Infocentre —> Special Functions —> Service —
> Code 8500 —> White balance.
Alignment Process
With the - + buttons set the VG (amplification
green) and VB (amplification blue) values so
that the white rectangular area in the middle of
the picture becomes achromatic.
Store with “OK” .
1.6: Alignment
Bottom flutter gate.
Preparation
Connect the video recorder and play back the
recording.
Infocentre —> Special Functions —> Service —
> Code 8500 —> Bottom flutter gate.
Alignment Process
With the - + buttons adjust for minimum flutter at
the top or bottom picture edge.
1.7: Alignment
Type of picture tube.
Preparation
Infocentre —> Special Functions —> Service —
> Code 8500 —> Tube type.
Alignment Process
With the - + buttons select T82/16:9 or T70/16:9.
1.8: Alignment
Video processor
Preparation
Infocentre —> Special Functions —> Service —
> Code 8500 —> Video processor.
Alignment Process
With the - + buttons switch the Video processor
to TDA 4686 or TDA 4780 which may be fitted to
the TV set. TDA 4780 contains the features for
Black Stretch, Blue Stretch and Gamma Control.
1.9: Alignment
RGB Sync-level.
Preparation
Infocentre —> Special Functions —> Service —
> Code 8500 —> RGB Sync-level.
Alignment Process
In RGB operation it is possible to set the RGB
level to “on” or “off” with the buttons - + to
eliminate line tearing for example in this mode.
1.10: Alignment
VM (Velocity Modulation).
Preparation
Infocentre —> Special Functions —> Service —
> Code 8500 —> Velocity Modulation.
Alignment Process
With the - + buttons switch the Velocity Modulation on or off.
1.11: Alignment
Picture Sharpness.
Preparation
Infocentre —> Picture Menu —> Sharpness.
Alignment Process
Adjust with - + buttons for optimal picture
sharpness.
1.12: Alignment
Colour Match.
Alignment Process
Infocentre —> Special Functions —> Settings
—> Colour Match.
1.13: Alignment
Picture Geometry.
Preparation
Infocentre —> Special Functions —> Service —
> Code 8500 —> Geometry.
Feed in a test generator pattern or a standard
test pattern in 16:9 format via the aerial or use
the integrated test pattern. Feed in the geometry
test pattern in Cinema mode.
Attention:
The “Line Shift” alignment influences the line
phase. Before this adjustment, set the horizontal
amplitude to minimum and if necessary correct
the raster position with the “Shift Plug”.
Reset:
The “Reset” menu contains:
either the optimum picture geometry data
entered during production or the average data
set read out from the ROM if the TV is switched
on with the emergency data set. If the TV has
been adjusted wrongly, these basic values can
be loaded at any time as follows:
Call up Infocentre —> Special Functions —>
Service —> Code 8500 —> Geometry —>
Reset and confirm with “OK”.
Alignment Process
Via the menu, select the geometry values for the
vertical deflection, then set the values for the
horizontal deflection, first at 50Hz then at 60Hz
field frequency. Now with - or + button, move the
picture into the centre of the raster. Re-adjust
the horizontal amplitude according to the test
pattern.
Store:
Call up “End without memory” and change with
the button - or + to “End with memory”.
Store the setting with the “OK” button.
Whenever the TV is switched on the picture
geometry is set to the value stored last.
1.14: Alignment
Adjustment of the bridge coil L573.
Preparation
Infocentre —> Special Functions —> Service —
> Code 8500 —> Geometry.
Set the horizontal amplitude (width) to minimum.
Connect channel 1 of the oscilloscope to the
collector of the transistor T572.
Connect channel 2 of the oscilloscope between
diodes D571 and D572.
Alignment Process
Set the coil L573 so that the pulse width of both
oscillograms is the same.
1.15: Alignment
Line Sharpness.
Preparation
Select the convergence test pattern:
Contrast to maximum, set the brightness so that
the black background of the test pattern is just
brightening.
Alignment Process
With focus control on the CRT panel adjust the
horizontal lines for maximum sharpness.
Subsequently, with the focus control on the
focusing panel, adjust the vertical lines for
maximum sharpness. Repeat.
Attention:
For measurements on the focusing panel use
only sufficiently insulated measuring cables and
test probes with adequate electric strength
(eg. 100:1).
2: Picture Tube Panel
Measuring instruments:
Oscilloscope with 10:1 test probe, high resistance voltmeter.
Service works after replacement or repair of the
picture tube panel:
Alignments no. 2:1 and 2:2.
Service Adjustments Cont’d.
3GRUNDIG CUC 1982
CRT Diagram
2.1: Alignment
White balance.
Preparation
Black Stretch set to “off” (Picture Menu).
Infocentre —> Special Functions —> Service —
> Code 8500 —> White Balance.
Alignment Process
With the - + buttons set the VG (amplification
green) and VB (amplification blue) values so
that the white rectangular area in the middle of
the picture becomes achromatic.
Store with “OK”.
2.2: Alignment
Screen grid voltage.
Preparation
- Feed in the test pattern.
- Switch the TV receiver to AV mode.
- Adjust the screen brightness with the remote
control handset so that the grey areas just
become dark.
- Connect the voltmeter (200 kW series
resistance) to the test points R,G,B to
determine the test point with the highest
voltage level.
- Oscilloscope: measured test point.
Alignment Process
With the control SG on the picture tube panel
set the voltage to 162.5V±2.5V.
If flyback lines are visible on the screen reduce
the voltage by 10V approximately.
East West Diagram
Fig 2.
Waveforms
- Video Diagram
GRUNDIG CUC 1982
4
Video Diagram
1
Continued at 1
5GRUNDIG CUC 1982
Sandcastle Diagram
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