Grundig CUC 7851 User manual

1
GRUNDIG CUC 7851
Recommended Safety Parts Cont’d.
Item Part No. Description
Item See Mode Book
Service Notes(See Notes)...........................................................Grundig G1000 Chassis 4
X-Ray Precautions(See Notes)...................................................Grundig G1000 Chassis 4
Circuit Diagram Symbols ...................................................................Grundig CUC 1982 5
Fault Finding Diagram ........................................................................Grundig CUC 7861 5
Colour Decoder Sync PCB Diagram .................................................Grundig CUC 7861 5
Control Unit PCB (with Videotext).....................................................Grundig CUC 7861 5
CRT PCB Diagram ...............................................................................Grundig CUC 7861 5
General Circuit Diagram .....................................................................Grundig CUC 7861 5
IF Amp Diagram (alternative) .............................................................Grundig CUC 7861 5
Remote Control Diagram ....................................................................Grundig CUC 6360 5
Socket PCB Diagram...........................................................................Grundig CUC 7861 5
Tuner Diagram .....................................................................................Grundig CUC 5301 3
Velocity Modulation PCB ....................................................................Grundig CUC 7861 5
Matrix
Recommended Safety Parts
Item Part No. Description
Service and Specia
Functions
With the remote control buttons.
EPROM Version Number
The version number can be called up in the Info
Menu with the “AUX” button. The index 02 of
the part number (19798-250.02) indicates the
EPROM version.
Changing the Display Brightness
The VFD brightness is changed by pressing the
“AUX” --> - + buttons sequentially.
Programme Lock (protection against
unauthorised use)
You can cancel your personal code number via
the Info Centre --> Timer --> Security Code by
pressing and OK sequentially.
ATS Reset
Press and hold the “L+” button on the local
keyboard while switching on with the mains
button. This option activates the ATS function
next time the TV is switched on.
One 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.
Maximum Programme Number
Via the Menu Info Centre --> Special Functions
--> Settings. When storing the channel number
“00” at any programme position, programme
selection with the buttons is limited to the
numbers lower than this position.
OSD-ON/OSD-OFF 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 OSD-OFF option the station
identifications and scales for the analog values
are not displayed.
OSD-ON/OSD-OFF Individual Programmes
Note: only TVs with LED display.
Activate the desired station via the Menu Info
Centre --> TV Station Table and enter a decimal
point “.” at the first place of the station identifi-
cation. With this setting the display can be
switched off for the selected programmes.
Loading the Average Values
Press and hold the “P” button on the local
keyboard and switch the TV on with the mains
button. In doing so the analog average values
for the programmes 1-99 and AV1- AV5 are
loaded in the programme memory IC840, the
AV witch-on bit is reset and the ATS bit is set.
The individual settings can be entered and
stored with the remote control handset.
ATS Reset
Press and hold the “L+” button the local
keyboard and switch the TV on with the mains
button.
Loading the Emergency Data (eg. after
changing µP IC850)
Connect pin 1 of the processor to chassis and
switch the TV on with the mains button. The
EPROM in the processor IC850 is loaded with:
- the data set and the geometry data for
the IC TDA 9162
- the white balance data VR, VG and VB
for the IC TDA 9162
- the IF and AFC control voltages.
Hi-Fi Output: off, variable, linear
Via theAudio Menu --> Hi-Fi Output, with the
buttons, the AF at the Hi-Fi output can be:
- Switched “off” (display shows P..),
normal operation.
- Set to “variable” (display shows PH..),
volume level for the Hi-Fi system can
be changed via the TV remote control.
The loud speakers in the TV receiver
are switched off in this case.
- Set to “linear” (display shows PH..),
constant level for the Hi-Fi system.
Switching Over the Sound (multi)
Stereo, Mono, FM, NICAM, NICAM B
Via the Audio Menu --> Sound it is possible with
the buttons to change over the stereo
decoder for the desired sound reception.
Forced Mono
By entering the option “MONO” or “.ONO” at the
1st, 2nd, 3rd and 4th place of the station name,
the stereo decoder can be made to switch over
to FM-mono. The “MO” option is not indicated in
the display.
Volume Level Matching
Via the Menu Info Centre --> Settings -->
Volume it is possible on RF mode and Peri
mode to set a volume offset on each TV
programme position (volume level matching).
Setting the Peri Bit
“AUX” --> “ “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.
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:
Select first the AV signal source eg.AV1, AV2 etc.
- On: “AUX” --> “0/AV” indication “Copy on”
- Off: “AUX” --> “0/AV” indication “Copy off”
Copying possibilities:
From To:
Scart socket, AV1 --> scart socket 2
black: (orange).
--> scart socket 3
(blue).
Scart socket, AV2 --> scart socket 3
orange: (blue).
Scart socket, AV3 --> scart socket 2
blue: (orange).
Cinch socket: AV4 --> scart socket 2
--> scart socket 3
S-Video socket: AV5 --> scart socket 2
(orange).
--> scart socket 3
(blue).
In stand-by mode:
Select first the AV signal source eg.AV 1, AV 2 etc
- On: “AUX” --> “0/AV”.Indication “Copy on”.
- Buttons “AUX” --> “ “. Indication
“COP” in the display.
Copying possibilities are the same
as before
- To interrupt the copy mode, press
button 1 (indication AV..). to continue
the copy mode, press “AUX” --> “ “.
- To cancel the copy mode press “ “ or
“power off”.
E72 911 09246-188.31 Degaussing Coil
WW. 09246-188.71 Degaussing Coil
8300-68-696 Pict. Tube A 68 KZN 696X01
29703-291.81 Power Switch
29201-361.17 Focus and UG2 Control
R 816, R817 8766-701-027 KSW SI A 12 OHM 5% -GA
WW. = Optional
M72 795
8300-68-696 Pict. Tube A68 KZN 696X01
29201-360.11 CRT Socket
09621-113.02 Fuse Holder
29303-452.02 Mains Plug, Lower Part
29703-291.32 Power Switch
8290-991-307 Power Cable
29201-361.17 Focus and UG 2 Control
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 29500-809.97 FUNKENTSTOERDR
R1876, R1877 8766-701-027 KSW SI A 12 OHM 5% -GA
R 6009 8311-200-010 DUO-PTC
SI 6001 8315-622-503 FS.3,15 A/T L 250V
TR6010 09032-301.02 NETZTRAFO
M72 795/9
09246-188.31 Degaussing Coil
WW. 09246-188.71 Degaussing Coil
8300-068-696 Pict. TubeA 68 KZN 696X01
09621-113.02 Fuse Holder
29303-452.02 Mains Plug, Lower Part
29703-291.32 Power Switch
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 29500-809.97 FUNKENTSTOERDR
R1876, R1877 8766-701-027 KSW SI A 12 OHM 5% -GA
R 6009 8311-200-010 DUO-PTC
SI 6001 8315-622-503 FS.3,15 A/T L 250V
TR6010 09032-301.02 NETZTRAFO
WW. = Optional
CUC 7851 (M72 795)
29201-361.17 Focus and UG 2-Control
C 7 8531-505-221 MKT 680PF 20% 12,5KV
C 621, C 622 8600-098-238 SI-KERKO B-SS 2200PF 20%
C 665 8660-098-234 SI-KERKO B-SS 1000PF 20%
C 666 8515-912-063 FKP1 0,033UF 20% 630V
OK 637,
OK 646 8306-000-012 OPTOKOPPLER CNY 17 F1
R 503 8701-230-817 NKS 3 4,7 OHM 5% >>>RES
R 520 8705-329-071 MOW LI 0411 820 OHM 5%
R 525 8735-003-068 DW 0,75W 0,68 OHM 10%
R 552 8700-229-009 KSW AX 0207-GANB
R 665 8766-349-155 MSW LI 0414 2,7 MOHM
R 667 8735-002-013 DRW 2 W 0,1 OHM 10%
SI 401, SI 406,
SI 411 8135-616-205 LOET-SI.-GR 800 MA/T
SI 630 8315-619-028 LOET-SI.-GR 1,6 A/T
SI 671 8315-622-025 LOET-SI.-GR 3,15A/T
SI 691 8315-623-008 LOET-SI.-GR 4 A/T
TR 8 29201-445.97 FOKUSIERUEBERTRAGER
TR 410 29201-382.97 UEBERTRAGER
TR 526 29201-030.08 DIODENSPLITTRAFO KPL
TR 651 29201-401.97 SPERRWANDLERTRAFO KPL
WW. 29201-453.01 SPERRWANDLERTRAFO KPL
WW. = Optional
CUC 7851 (M72 795/9)
29201-361.17 Focus and UG 2-Control
C 7 8531-505-221 MKT 680PF 20% 12,5KV
C 621, C 622 8600-098-238 SI-KERKO B-SS 2200PF 20%
C 665 8660-098-234 SI-KERKO B-SS 1000PF 20%
C 666 8515-912-063 FKP1 0,033UF 20% 630V
OK 637,
OK 646 8306-000-012 OPTOKOPPLER CNY 17 F1
R 503 8701-230-817 NKS 3 4,7 OHM 5% >>>RES
R 520 8705-329-071 MOW LI 0411 820 OHM 5%
R 525 8735-003-068 DW 0,75W 0,68 OHM 10%
R 552 8700-229-009 KSW AX 0207-GANB
R 665 8766-349-155 MSW LI 0414 2,7 MOHM
R 667 8735-002-013 DRW 2 W 0,1 OHM 10%
SI 401, SI 406,
SI 411 8135-616-205 LOET-SI.-GR 800 MA/T
SI 630 8315-619-028 LOET-SI.-GR 1,6 A/T
SI 671 8315-622-025 LOET-SI.-GR 3,15A/T
SI 691 8315-623-008 LOET-SI.-GR 4 A/T
TR 8 29201-445.97 FOKUSIERUEBERTRAGER
TR 410 29201-382.97 UEBERTRAGER
TR 526 29201-030.08 DIODENSPLITTRAFO KPL
TR 651 29201-401.97 SPERRWANDLERTRAFO KPL
WW. 29201-453.01 SPERRWANDLERTRAFO KPL
WW. = Optional
CUC 7851 (E72 911)
09621-113.02 Fuse Holder
C 7 8531-505-221 MKT 680PF 20% 12,5KV
C 621, C 622 8600-098-238 SI-KERKO B-SS 2200PF 20%
C 665 8660-098-234 SI-KERKO B-SS 1000PF 20%
C 666 8515-912-063 FKP1 0,033UF 20% 630V
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 29500-809.97 FUNKENTSTOERDR.
OK 637 8306-000-012 OPTOKOPPLER CNY 17 F1
OK 646 8306-000-012 OPTOKOPPLER CNY 17F1
R 503 8701-230-817 NKS 3 4,7 OHM 5% ROE
R 520 8705-329-071 MOW LI 0411 820 OHM 5%
R 525 8735-003-068 DW 0,75W 0,68 OHM 10%
R 552 8700-329-009 KSW LI 0207-NE 2,2 OHM
R 665 8766-349-155 MSW LI 0414 2,7 MOHM
R 667 8735-002-013 DRW 2 W 0,1 OHM 10%
R 6009 8311-200-010 DUO-PTC
SI 401, SI 406,
SI 411 8135-616-205 LOET-SI.-GR 800 MA/T
SI 630 8315-619-028 LOET-SI.-GR 1,6 A/T
SI 671 8315-622-025 LOET-SI.-GR 3,15A/T
SI 691 8315-623-008 LOET-SI.-GR 4 A/T
SI6001 8315-622-003 FS.3,15 A/T L 250V
TR 8 29201-445.97 FOKUSIERUEBERTRAGER
TR 410 29201-382.97 UEBERTRAGER EF20
TR 526 29201-030.08 DIODENSPLITTRAFO KPL
TR6010 09302-301.02 NETZTRAFO
TR 651 29201-401.97 SPERRWANDLERTRAFO KPL
WW. 29201-453.01 SPERRWANDLERTRAFO KPL
WW. = Optional

2GRUNDIG CUC 7851
Service and Specia
Functions Cont’d
Socket
Diagram
Interference Diagram
IR-Data Programmer
With this menu and with the IR-Data Program-
mer 2 it is possible to store a maximum of 99
programme positions with the data for the TV
norm, Peri, 6-place station identification and the
fine tuning frequency.
The programmer AP transfers only channels
and 4-place station identifications.
Call up via the Menu Info Centre --> Special
Functions --> IR-Data Programmer.
Emergency Data
If necessary the emergency data can be read
out from the EPROM. See “Service Adjust-
ments”.
Service Adjustments
Changing the Sharpness
Call up the Info Menu --> Picture Menu -->
Sharpness, and change the value with .
Colour Registration
The colour registration function allows to
compensate for differences in the delay
between the Y-channel and the chroma
channel.
- With the Menu guide call up the
“Colour Match” menu via the Service
Programme, Info Centre --> Special
Functions --> Service --> Code 8500.
- With buttons correct the delay so
that the Y chroma signals coincide.
White Balance
- Call up the White Balance menu via the
Info Centre --> Special Functions -->
Service --> code 8500.
- 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.
Tuner AGC
The automatic Gain Control offers two possibili-
ties of adjusting the delayed automatic gain
control voltage for the tuner:
1: Feed a standard test pattern at a
channel in the upper range of the UHF
band into the aerial socket. The RF
should be 1.5mV (64dBmV).
Call up the “Tuner-AGC” menu via the
Service Programme Info Centre -->
Special Functions --> Service --> Code
8500, select “automatic” and confirm.
The control processor will set the
correct value for the delayed gain
control voltage.
2: Feed in a standard test pattern at a
UHF channel as high as possible to
the aerial socket.
Call up the “Tuner-AGC” menu, Info
Centre --> Special Functions -->
Service --> Code 8500, select “manual”
and confirm.
With the buttons tune the TV
station so that noise just begins to
appear in the picture. Then tune in the
reverse direction until the picture just
becomes noise free. Store with OK.
AFC-Reference
The AFC control voltage influences the setting
of the station (fine tuning) on HF-reproduction
and on station search mode.
The Automatic Frequency Control is activated
only if the desired programme position is
marked with the station identification AV.
- Tune the tuner precisely at a
programme position.
- Call up the AFC Reference Menu via
Service Programme --> Info Centre -->
Special Functions --> Service --> Code
8500 --> with the menu guide and
activate with OK.
On activation of the AFC function a voltage level
is read out from the IF-amplifier which is used
as a reference for AV-programmes and on
station search.
Adjustment of the Screen Grid Voltage USG
- Feed in a test pattern
- With the remote control adjust the
screen brightness so that the grey
areas just become dark.
- Switch the receiver to AV operation.
- Connect a high-ohmic voltmeter
(series resistance 220kOhm approx.)
to the test points R, G, B and deter
mine the highest voltage.
- With the control USG on the picture
tube panel set the highest voltage
level to approx. 10V.
Adjustment of the Bridge Coil L511
- Call up the Geometry Menu via Info
Centre --> Special Functions -->
Service --> Code 8500. Set the
horizontal amplitude to minimum.
- Connect one test probe of a dual-
beam oscilloscope to the collector of
the transistor T572.
- Connect the second test probe
between the diodes D502 and D503.
- Adjust the coil L511 so that the pulse
width of both oscillogrames is
the same.
Adjustment of the Line Sharpness
With the focus control on the adjustment
control panel adjust the lines in the north-south
direction for maximum sharpness.
TV receivers with focusing panel:
Subsequently, with the focus control on the
focusing panel, adjust the lines in the east-west
direction for maximum sharpness.
Repeat if necessary.
Attention: For measurements on the focusing
panel use only sufficiently insulated measuring
cables and test probes with adequate electric
strength (eg. 100:1).
Videotext (VT) Matching Adjustment
At the time of delivery the control R378 is set to
the lowest high-frequency emphasis. If, despite
a perfect aerial signal, character faults occur,
turn R378 slowly until the character errors
disappear. Do not turn R378 any more as the
error rate may increase again.
During this adjustment page 199 must always
be selected anew so that it is read in anew
making it possible to evaluate the error rate.
Picture Geometry and Picture Position
Adjustment via the Remote Control Handset
For accurate adjustment of the picture a test
generator or standard test pattern should be
used. For raster corrections it is also possible to
use the integrated test pattern.
1: Call up the Geometry Menu via Info
centre --> Special Functions --> Service
--> code 8500.
2: If a standard test pattern is not
available, move the bar with the cursor
buttons to the menu item “Test
Pattern On”.
Attention: Start always with the “V-middle”
adjustment otherwise the other vertical deflec-
tion parameters would defy correct geometry
adjustment.
“V-Middle” Adjustment with a Colour Test
Pattern
- Select the “V-Middle” menu. The upper
part of the picture is coloured, the
lower part is black and white.
- With the or buttons move the three
broken lines on the left and on the right
of the indication “V-Middle” upwards or
downwards so that they coincide with
the line separating the coloured part
and the black/white part of the picture.
- Continue with the picture geometry
adjustment via the menu and store.
V-Middle Adjustment with a Video Generator,
eg. Grundig VG 1000
- Feed in the convergence test pattern
with standard colour bars via RF.
- Call up the “V-Middle” menu.
- With the or button change the
setting so that the G-Y vector (orange
area in the centre of the picture) is just
covered.
- Continue with the picture geometry
adjustment via the menu and store.
The “line shift” alignment influences the line
phase setting. Before this adjustment set the
horizontal amplitude to minimum and if neces-
sary correct the raster position with the “Shift
Plug”. With button or move the picture into
the centre of the raster. Re-adjust the horizontal
amplitude with the test pattern.
3:To store this adjustment, move the bar to
“Terminate with store” and confirm with OK.
The picture geometry is set to the last stored
value whenever the receiver is switched on.
Reset:
Under the menu item “Reset” an average data
set from the ROM is stored. After inadvertent re-
adjustment during servicing, these basic values
can be re-loaded at any time. For this, move the
yellow bar to “Reset”, press the OK button. By
pressing the “AUX” button the picture geometry
is set according to this “Reset” values.
4:With the ibutton return to the normal menu.

3
GRUNDIG CUC 7851
IF Amp Diagram
AF Amp Diagram

4GRUNDIG CUC 7851
Contro Text Diagram