Abgleichvorschriften / Adjustment Procedures
GV470S…
3 - 6
GRUNDIG Servicetechnik
GB
Adjustment Procedures
1. Power Supply (PS)
Test Equipment: Digital Voltmeter.
Service work after replacing the Power Supply: –
Adjustment
Preparation
Adjustment Procedure
+12V
D
Adjust voltage to 12V
±
0.1V with R3090.
Digital voltmeter: .................................................. MP
1
Playback.
2. Family Board
Service work after replacing the Family Board:
– 2.1 Sequence Control ..................................... Adjustment no. 1, 2
– 2.4 FM Sound ..................................................... Adjustment no. 3
– 2.5 Standard Sound ....................................... Adjustment no. 1…4
– 3.1 S-VHS Board – Luminance ....................... Adjustment no. 5, 9
2.1 Family Board – Sequence Control/Deck Electronic (DE)
Test Equipment: Oscilloscope, 10:1 Test Probe, Frequency Counter.
Service work after changing …
… Family Board: Adjustment no. 1, 2
… the IC7075: Adjustment no. 1
2.3 Frontend – Adjustment no. 6, 7
… the IC7080: Adjustment no. 1…3
3.1 S-VHS Board – Luminance, Adjustment no. 9
Adjustment
Preparation
Adjustment Procedure
Press the buttons
>
and
V
simultaneously on the recorder and connect the mains plug.
In doing so, the following channels are set on the first 5 programme positions for frontend adjustment (vision
demodulator circuit):
Programme 1 – channel 12; programme 2 – channel 21; programme 3 – channel 68
programme 4 – channel 8; programme 5 – channel 60
Warning: This function erases all data entered by the customer (stations selected, …)!
– Load a test cassette. The video recorder then switches automatically to play mode.
– Call up the service function:
– Press the
Z
button on the remote control handset ("
CODE – – – –
" is indicated in the display).
– Enter the code number
4
9
3
4
and press the
O
button ("
SERV
" is indicated in the display).
– Press the
3
button.
During the automatic adjustment of the headwheel position indicator the display shows "
DRUM 00
00
A3
".
On successful adjustment the video recorder ejects the test cassette.
– To cancel the service function: Mains reset or press the "Standby" button.
Connect IC7080-(7) to +5V
D
via a 10k
Ω
resistor.
Frequency counter to IC7080-(7).
Standby.
1. Initializing the
RAM (IC7080),
EEPROM (IC7075)
and
Archiv-EEPROMs
(IC7040)
2. Headwheel
Position Indicator
3. Clock, C2076
Set clock period to 1s
±
4
µ
s via C2076. Remove the 10k
Ω
resistor.
