Medion MD-7078VTS Service Manual Download

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Alignment instructions

General information:

When servicing, the set should be connected to an Isola-
tion transformer and observe valid safety precautions!

Precautions against static discharge should be taken.

X-rav regulations: The HT voltage is in the permissible

ränge if the operating voltage is 145V (for TV 9.4 = 136V)

with minimum beam current. When a set has been serv-
iced check that the HT voltage is correct. The "basic val-

ues" given in the adjustment procedures may differ due to
circuit amendments, revised specification and tolerances.

Subject to changes!

Operating v145V:

Set contrast and brightness to minimum (minimum beam
current!). Check point: Cathode diode D 202 against sec-
ondary ground. Set with R 215 the measured voltage to
145V (for TV 9.4 = 136V) (±0.5V).

| Alignment IF module:

Note:
Please at first carry out the settings for AFC and then for

AGC, for offset compensation and for L'-frequency offset.

AFC-voltaae:

In ränge III (channel 8) feed in a Pal-B/G or Pal-l lest
pattern with an antenna input level of 70 dB|JV at 75Q and

set television per direct channel selection to this channel.
At tuner pin8 (AFC) and pin3 (GND) connect a Voltmeter
and set with coil Z 603 a voltage of 2.5V (±0.1 V) DC.

AGC-voltage:

In ränge III (channel 8) feed in a Pal-B/G or Pal-l tost
pattern with an antenna input level of 70 dBuV (tuner

5002 PH5 used) or 65 dBuV (tuner 6002 PH5 used) at

75Q, and set television per direct channel selection to this
channel. At tuner pin1 (AGC) and pin3 (GND) connect a
Voltmeter and set with resistor R 616 a voltage like fol-

lowing table.

Chassis version:

TV 9.1 till TV 9.4 BG/Multi

with tuner type 5002 PH5
TV 9.6 BG/Multi
with tuner type 5002 PH5
TV 9.1 till TV 9.6 BG
with tuner type 6002 PH5
TV 9.1 till TV 9.6 Multi/Nicam l
with tuner type 6002 PH5
TV 9.1 Nicam l
with tuner type 6002 PH5

AGC voltage:

2,90 V (±0,1 V)

2,85 V (±0,1 V)

3,15 V (± 0,15V)

3,00 V (±0,15V)

Freguencv off set image carrier circuit for L':

»This information obtain only units with Multi Standard!«

On channel 4 feed in an L'-Secam-test pattern with an
antenna input level of 60 (±5) dBuV and set the television
per direct channel selection to the respective channel
(Standard conversion to L'!). At tuner pin8 (AFC) and pin3
(GND) connect a Voltmeter and set with resistor R 633 a

voltage of 2.5V (±0.1 V) DC.

Service mode:

Before activating service mode set suited test pattern. Set
medium brightness, colour, contrast and sharpness. Set-

ting geometry values in the decoder mode requires a

Standard 16:9 tost picture (e.g. Pal Plus decoder or DVD
player). Balancing a chassis TV 9.3 also requires a 16:9
letterbox lest picture (black bars at the top and bottom)
apart from the 4:3 and 16:9 tost picture. On 16:9 sets
(chassis TV 9.3), four different display formats can be set
(cp. operating manual under »Picture-menu«). Thats why
you have to adjust the geometry for any picture-format-
mode (4:3,16:9, zoom and decoder) separately.

Select Service mode:

Simultaneously press and then release the "red" and
"blue" button on the transmitter. Simultaneously press

within five seconds the buttons » - P « and » -^ + « at
the local control panel. On Screen appear • Service
Mode TV 9 Version x.xx • (X.XX means the Ver-
sion of Software).

Select Parameters
Change Parameters
Store the changes

Leave Service Mode

Buttons » A / V «
Buttons »- -^ +«
» OK « button

» TV « button

Settings in service mode menu:

This section „Settings in service mode menu" is only

relevant to set versions with Software MP2.xx.

The following settings can be carhed out in the service

mode menu. To select the menu line press the »red«
button. Principle each change must be stored separatelv
by pressing the » OK « button.

• New Initialisation of the NVM values, without ad-

justing the geometry settings.

In order to do so, the version number must be changed