Grundig CUC-7861 Service Manual
1GRUNDIG CUC 7861
RTV servis Horvat
Tel: ++385-31-856-637
Tel/fax: ++385-31-856-139
Mob: 098-788-319
www.rtv-horvat-dj.hr
Matrix
Item See Model Book
Service Notes - See Note
X-Ray Precautions - See Note
Remote Control Diagram ................................................................... Grundig CUC 6360 5
Tuner Diagram .................................................................................... Grundig CUC 5301 3
Recommended Safety Parts
Item Part No. Description
E72 9112
WW. 09246-188.71 Degaussing Coil
R 816, R 817 8766-701-027 KSW SI A 12 OHM 5% -GA
ST72 760/9
WW. 09246-188.71 Degaussing Coil
R 1850 8765-049-157 MSW AX 0414-GA 3,3 MOHM
ST63 760/9
R 1850 8765-049-157 MSW AX 0414-GA 3,3 MOHM
CUC 7861
C 7 8531-505-221 MKT 680PF 20% 12,5KV
C 621 8660-098-238 SI-KERKO B-SS 2200PF 20%
C622 8660-098-238 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 8511-793-045 MP 0,33 UF 20% 250VW
L 6001 29500-809.97 FUNKENSTOERDR
OK637 8306-000-012 OPTOKOPPLET CNY 17 F1
OK646 8306-000-012 OPTOKOPPLET CNY 17 F1
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 551 8705-227-423 MOW AX0411-GA 8,2 OHM 5% DRA 22
R 552 8700-329-009 KSW LI 0207-NE 2,2 OHM
R 665 8766-349-155 MSW LI 0414 2,7 MOHM
R 6009 8311-200-010 DUO-PTC
SI 401 8315-616-205 LOET-SI.-GR 800 MA/T
SI 406 8315-616-205 LOET-SI.-GR 800 MA/T
SI 411 8315-616-205 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 3,15 A/T
SI 691 8315-623-008 LOET-SI.-GR 4 A/T
SI 6001 8315-622-503 FS.3,15 A/T H 250V
TR 8 29201-445.97 FOKUSIERUEBERTRAGER
TR 410 29201-382.97 UEBERTRAGER EF20
TR 526 29201-030.08 DIODENSPLITTRAO KPL
TR 6010 09032-301.02 NETZTRAFO
TR 651 29201-408.97 SPERRWANDLERTRAFO KPL
WW. 29201-453.08 SPERRWANDLERTRAFO KPL (WW. = Optional)
Service Adjustments
1: Switching-on Options
ATS Reset
Press and hold the L+ button on the local
keyboard while switching on with the mains
button to set the ATS-bit. This option activates
the ATS function next time the receiver is
switched on.
09246-188.31 Degaussing Coil
8300-068-696 Pict. Tube A 68 KZN 696X01
29201-360.11 CRT Socket
29703-291.81 Power Switch
8290-991-356 Power Cable
29201-361.17 Focus-UG 2 Control
29305-022.26 CRT Board CUC 7800
09246-188.31 Degaussing Coil
8300-068-696 Pict. Tube A 68 KZN 696X01
29201-360.11 CRT Socket
29303-452.03 Mains Plug - Lower Part
29703-291.32 Power Switch
8290-991-361 Power Cable
29201-361.17 Focus Control Unit
09246-188.71 Degaussing Coil
8300-059-696 Pict. Tube A 59 LCG 696X01
29201-360.11 CRT Socket
29201-471.01 Euro-Converter
29303-377.03 Bracket Plug 2-POL
29303-452.03 Mains Plug - Lower Part
29703-291.32 Power Switch
8290-991-361 Power Cable
29201-361.19 Focus Control Unit
29304-050.95 Mains Interference Unit
09621-113.02 Fuse Holder
Service and Special
Functions
ATS Start
Pressing the buttons “P/C” (approx. 4 secs.) -->
OK (language selection menu) --> starts the
Auto Tuning System (ATS).
When finding a TV signal, the ATS system
automatically determines the fine tuning value
and the VPS signal for the station ident.
Additionally for the programmes 1 ... 99 the
volume offset is reset and the optimum values
for brightness, colour contrast and volume level
are stored together with the Peri bit for the
respective country.
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 - AV4 are
loaded in the programme memory IC840, the
Luminance Delay is set to “0”. The individual
settings can be entered and stored with the
remote control handset.
Emergency Data
The processor IC850 in this TV receiver is fitted
with two memories in which the picture geometry data is stored. If this IC fails or the data has
been changed the TV receiver must be
switched on with the emergency data set.
Loading the Emergency Data (eg. after
changing mP IC850)
Connect pin 2 of the processor to chassis and
switch the TV on with the mains button. The
EEPROM in the processor IC850 is loaded with:
- the basic data set and the geometry
data for the Decoder/Sync Processor
TDA 9160/9162.
- the basic data set for the RGB
Processor TDA 4685.
- the AGC reference voltage (tuner gain
control).
- the AFC reference voltage
(PLL-control).
2: Settings Via the Info Menu
EPROM Version Number
The version number can be called up in the Info
Menu with the “AUX” button. The index 05 of the
part number (19798-254.05) indicates the
EPROM version.
Programme Lock
(protection against unauthorised use)
You can cancel your personal code number by
pressing and OK sequentially.
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
is switched off.
Volume Offset
Via the menu --> Special Functions -->
Settings the volume level can be changed in 16
steps for each individual programme position.
3: Settings via the Audio Menu
The following settings can be changed with the
Audio Menu:
- Loudspeaker: Mono/Stereo sound
- Headphones: Mono/Stereo sound
- Equaliser: frequencies 1 ... 12kHz
- Configuration of loudspeaker boxes
- Effect sounds with the IDTV button
(effect sound fields menu).
Switching Over the Sound (only multi system) to:
Stereo, Mono, FM, NICAM, NICAM B
Via the Audio Menu --> Sound.
Switch the stereo decoder for the desired sound
reception with buttons.
FM-sound stereo broadcast:
- Switchable between Stereo <—> Mono
- Two-channel sound: switchable between
Sound 1 <—> Sound 2.
The sound for the loudspeakers and headphones can be switched over independently of
each other.
NICAM-sound mono broadcast:
- switchable between NICAM Mono
<—> FM-Mono
NICAM-sound stereo broadcast:
- switchable between NICAM Stereo
<—> FM-Mono
NICAM-sound dual-sound broadcast:
- switchable to NICAM-sound 1 -->
NICAM-sound 2 --> FM-Mono
NICAM not relating to the picture:
- switchable to NICAM-sound 1 --> NICAM-
sound 2 --> FM-Mono, preferred sound is
FM-Mono
AV mode:
- Stereo (preferred setting) --> Sound 1
--> Sound 2
- With Sound 1 and Sound 2, the sound
for the loudspeakers and headphones
can be switched over independently of
each other.
4: Settings via the Station Ident
Select the menu Info Centre --> TV station
Table and activate the desired TV station.
OSD-ON/OSD-OFF Individual Programmes
Note: only TVs with LED display.
Enter a decimal point “.” at the first place of the
station identification. With this setting the
display can be switched off for the individual
programmes.
The first places of the station identification can
be filled with any kind of characters.
Forced Switching to Mono
Example: MONO
Indication: ARD
The stereo decoder is made to remain in the
FM-Mono mode. This function is advantageous
in the case of stereo broadcasts in poor
reception conditions.
Automatic Frequency Control
AV or AF
The TV tuner is automatically re-tuned according to the variations of the receiving frequency
which is advantageous when feeding in the
video signal via the aerial socket.
Forced Switching to SECAM
SECAM or SE
Colour errors may occur when operating the TV
with Canal-plus decoders in SECAM standard.
These errors can be eliminated by forced
switching to SECAM.
5: Settings via the AUX Position
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 4 secs.
Changing the Display Brightness
(VFD display only)
Press the “AUX” button --> buttons sequentially.
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:
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
AV1(black) --> AV2 (orange) and AV3 (blue).
AV2 (orange) --> AV3 (blue).
AV3 (blue) --> AV2 (orange).
AV4 (CCVS-socket) --> AV2 (orange) and AV3 (blue).
AV5 (S-VHS) --> AV2 (orange) and AV3 (blue).
Please take into account the following restrictions:
- Peri operation is not possible when
AV1 is used as a signal source.
- Switching over to the AV2 or AV3
programme is only possible if the
selected AV position and the signal
source are the same.
Copy function In stand-by mode:
(not for OSD-TVs).
Firstly select the AV signal source eg. A V1, AV2 etc.
- On: “AUX” --> “0/AV”
(Indication “Copy on”.)
- Buttons “AUX” --> “ “
(Indication “COP” in the display.)
Copying possibilities are the same as before.
Attention: In Copy Standby-Mode the
switched-mode power supply is not switched off.
De-activation of the copy-mode:
(not for OSD-TVs).
To cancel the copy mode:
- Press standby or power switch off.
Changing the headphone volume
Enter “AUX” --> changes the volume level
for headphones.
Switching to 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 transfer a maximum of 99
programme positions with the data for the 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 and the 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: Autom. Change between 4:3/16:9 Aspect
Ratio
With the setting “Format 4:3/16:9 auto” the
aspect ratio is switched over automatically
- in programme positions 1 ... 99 when
the decoder is set to “ON”
- in AV position or with the Peri-bit set,
when a 16:9 signal source is
connected to the AV1 socket.
Identification:
- 16:9 switching voltage at the AV1
source, Pin 8 = 6V.
- 4:3 switching voltage at the AV1
source, Pin 8 = 12V.
8: Setting the Analog Values
When exceeding the minimum acceptable
values for the brightness, colour contrast and
volume level specified in the table below, the
appropriate optimum value is initialised when
switching the TV on or changing from RF value AV .
Brightness 18 32
Minimum value Optimum value
Colour contrast24 40
B/W contrast 21 32
Volume 10 10
Alignment
All adjustment controls not mentioned in this
description are adjusted during production and
must not be re-adjusted in the case of repairs.
1. Chassis Board
Measuring Instruments:
Oscilloscope with 10:1 test probe
Colour test pattern
High resistance voltmeter.
Checks and adjustments after replacement
or repair of:
Power Supply: 1.1
Horizontal Deflection: 1.2, 1.4, 1.8, 1.9
Picture Tube/CRT Panel: 1.2, 1.7
Colour-Decoder
Sync. Module: 1.7
IF Amplifier, Tuner: 1.5
Tuning Module: 1.6, 1.8
Vertical Deflection: 1.9
Bridge Coil: only necessary after improper
changes in the horizontal deflection adjustment 1.3
1.1: Alignment
+A Voltage
Preparation
Set luminance to minimum.
Connect the voltmeter to the cathode of D681.
Alignment Process
Set the control R654 to the voltage 152V.
1.2: Alignment
Screen grid voltage U
Preparation
Feed in a test pattern.
With the remote control adjust the screen
brightness so that the grey areas just become dark.
Switch the TV receiver to AV operation.
Connect a high-ohmic voltmeter (series
resistance approx. 220 W) to the test points R,
G, B and determine the maximum voltage.
Alignment Process
With the control SG on the picture tube panel
set the maximum voltage level to approx.
165 ... 170V.
If retrace lines are visible on the screen reduce
the voltage by approx. 10V.
1.3: Alignment
Bridge coil L551
Preparation
The bridge coil L551 is correctly adjusted during
production and should not be readjusted
anymore.
Call up the Service Programme --> Info Centre -
-> Special Functions --> Service --> Code 8500
--> Geometry.
Set the horizontal amplitude to minimum.
Connect channel one an oscilloscope to the
collector of the transistor T572.
Connect channel two of an oscilloscope
between the diodes D502 and D503.
Alignment Process
Adjust the coil L511 so that both oscillograms
have the same pulse width.
Re-adjust the horizontal amplitude according to
the test pattern and store.
SG
Control & Keyboard Diagram / Main Diagram / Main Diagram Cont’d. / Control Unit / Velocity Diagram / CRT Diagram / Socket Diagram / Colour Decoder Sync. Diagram
DSP Diagram / Display Control Unit with Videotext Diagram / AF Output Diagrams “A” & “B” / IF Amp Diagram / IF Amp Diagram Cont’d / Tuner Diagram
Service Adjustments / Adjustments Cont’d. / Safety Parts / Alignment / Trouble Shooting (Power Supply) / Interference Elimination Diagram
2GRUNDIG CUC 7861
Service Adjustments Cont’d.
1.4: 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 the focus control adjust the horizontal lines
for maximum sharpness.
Attention: For measurements on the focusing
panel use only sufficiently insulated measuring
cables and test probes with adequate electric
strength (eg. 100:1).
1.5: Alignment
Tuner-AGC. Manual or Automatic.
Preparation
Manual:
Feed in a standard test pattern in the upper
range of the UHF band; the RF must be 1.5mV
(64dBmV, noise free picture) at least.
Info Centre --> Special Functions --> Service -->
Code 8500 --> Tuner-AGC --> Manual.
Automatic:
Info Centre --> Special Functions --> Service -->
Code 8500 --> Tuner-AGC --> Automatic.
AFC-Reference:
Info Centre --> Special Functions --> Service -->
Code 8500 --> AFC-Reference.
Tune to a local station on a channel as low
as possible at the desired programme position
with standard channel spacing without fine
tuning.
Not For Servicing.
Alignment Process
Programme Info Centre --> Special Functions -> Service --> Code 8500.
Alignment Process
With - and + set the VG and VB values so that
the white rectangular area in the middle of the
picture becomes achromatic. Store with OK.
1.8: Alignment
Picture sharpness
Preparation
Call up the programme position of the desired
TV station.
Info Centre --> Picture Menu --> Sharpness.
Alignment Process
Change the value with the buttons - +.
1.9:Alignment
Picture geometry
Preparation
Info Centre --> Special Functions --> Service -->
Code 8500 --> Geometry.
For accurate adjustment of the picture a test
generator or standard test pattern should be
used. The integrated test pattern or grid pattern
may also be used.
Attention: Start always with the “V-Middle”
adjustment otherwise the other vertical deflection parameters would defy correct geometry
adjustment.
Alignment Process
Via the menu, select the geometry values for the
vertical deflection, then set the values for the
horizontal deflection.
Preparation
“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.
Trouble Shooting Guide
-Power Supply
Interference Elimination Diagram
Manual:
With buttons - and + tune the TV station so that
noise just starts to appear in the picture. Then
tune in reverse direction until the picture
becomes noise free. Store with OK.
Automatic:
The control processor will set the optimum value
for the delayed gain control voltage. Activate
with button OK.
AFC-Reference:
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 VCRRF playback (station identification “AV”) to
readjust the modulator drift. Activate with OK.
No function for the buttons - and +.
1.6: Alignment
Colour match.
Preparation
Call up the programme position of the desired
TV station.
Info Centre --> Special Functions --> Settings ->Colour Match.
Alignment Process
Adjust with - and + buttons to make the signals
coincide. Store with OK.
1.7: Alignment
White balance
Alignment Process
With the - or + button 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 B/W part of the picture.
Continue with the picture geometry adjustment
via the menu and store.
Preparation
“V-Middle” adjustment with a video generator,
eg. Grundig VG 1000.
Feed in the convergence test pattern with
standard colour bars via RF.
To store this adjustment move the bar to
“Terminate with Store” and confirm with OK.
Alignment Process
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.
Preparation
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 IC860 is stored. After
inadvertent readjustment during servicing, these
basic values can be re-loaded at any time. For
this, move the bar to “Reset”. Press the OK
button. By pressing the “AUX” button the picture
geometry is set according to the “Reset” values.
With the i button return to the normal menu.
Control & Keyboard
Diagram
Preparation
Call up the White Balance menu via the Service
Service Adjustments / Adjustments Cont’d. / Safety Parts / Alignment / Trouble Shooting (Power Supply) / Interference Elimination Diagram
Control & Keyboard Diagram / Main Diagram / Main Diagram Cont’d. / Control Unit / Velocity Diagram / CRT Diagram / Socket Diagram / Colour Decoder Sync. Diagram
DSP Diagram / Display Control Unit with Videotext Diagram / AF Output Diagrams “A” & “B” / IF Amp Diagram / IF Amp Diagram Cont’d / Tuner Diagram
3GRUNDIG CUC 7861
RTV servis Horvat
Tel: ++385-31-856-637
Tel/fax: ++385-31-856-139
Mob: 098-788-319
www.rtv-horvat-dj.hr
Continued at 1
Main Diagram
Control & Keyboard Diagram / Main Diagram / Main Diagram Cont’d. / Control Unit / Velocity Diagram / CRT Diagram / Socket Diagram / Colour Decoder Sync. Diagram
DSP Diagram / Display Control Unit with Videotext Diagram / AF Output Diagrams “A” & “B” / IF Amp Diagram / IF Amp Diagram Cont’d / Tuner Diagram
Service Adjustments / Adjustments Cont’d. / Safety Parts / Alignment / Trouble Shooting (Power Supply) / Interference Elimination Diagram
4GRUNDIG CUC 7861
Main Diagram Cont’d.
1
Service Adjustments / Adjustments Cont’d. / Safety Parts / Alignment / Trouble Shooting (Power Supply) / Interference Elimination Diagram
Control & Keyboard Diagram / Main Diagram / Main Diagram Cont’d. / Control Unit / Velocity Diagram / CRT Diagram / Socket Diagram / Colour Decoder Sync. Diagram
DSP Diagram / Display Control Unit with Videotext Diagram / AF Output Diagrams “A” & “B” / IF Amp Diagram / IF Amp Diagram Cont’d / Tuner Diagram
5GRUNDIG CUC 7861
Control Unit Diagram
Velocity Diagram
Waveforms
Waveforms
CRT Diagram
Service Adjustments / Adjustments Cont’d. / Safety Parts / Alignment / Trouble Shooting (Power Supply) / Interference Elimination Diagram
Control & Keyboard Diagram / Main Diagram / Main Diagram Cont’d. / Control Unit / Velocity Diagram / CRT Diagram / Socket Diagram / Colour Decoder Sync. Diagram
DSP Diagram / Display Control Unit with Videotext Diagram / AF Output Diagrams “A” & “B” / IF Amp Diagram / IF Amp Diagram Cont’d / Tuner Diagram
Loading...