Adjustment Procedures; Power Supply (Ps); Family Board; Sequence Control / Deckelectronic (De) - Grundig GV 440 NIC Servicehandbuch

GV44..., GV45..., GV46...
GB

Adjustment Procedures

1. Power Supply (PS)

Test Equipment: Digital Voltmeter.
Service work after replacing the Power Supply: –
Adjustment
+12V Digital voltmeter: .................................................. MP
D
Playback.

2. Family Board

Service work after replacing the Family Board:
– 2.1 Sequence Control ..................................... Adjustment no. 1, 2
– 2.4 Video ........................................................ Adjustment no. 3, 5
– 2.6 FM Sound ................................................. Adjustment no. 2, 3
– 2.7 Standard Sound ....................................... Adjustment no. 1...4
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 IC7058: Adjustment no. 1
2.3 Frontend – Adjustment no. 6, 7
– the IC7060: Adjustment no. 1...3
2.4 Video – Adjustment no. 5
Adjustment
1. Initializing the Press the buttons
RAM (IC7060) and In doing so, the following channels are set on the first 5 programme positions for frontend adjustment (vision
EEPROM (IC7058) 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, ...)!
2. Headwheel – Load a test cassette. The video recorder then switches automatically to play mode.
– Call up the service function:
Position Indicator
– Press the
– Enter the code number
– Press the
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.
3. Clock, C2060
Connect IC7060-(7) to +5V
Frequency counter to IC7060-(7).
Standby.
GRUNDIG Service-Technik
Preparation
Preparation
> V
and simultaneously on the recorder and connect the mains plug.
button on the remote control handset (" CODE – – – – " is indicated in the display).
Z
4 9 3 4
and press the
3
button.
via a 10kΩ resistor.
D
Abgleichvorschriften / Adjustment Procedures
Adjustment Procedure
±
1 Adjust voltage to 12V 0.1V with R3090.
Adjustment Procedure
O button (" SERV " is indicated in the display).
± µ
Set clock period to 1s 4
resistor.
s via C2060. Remove the 10kΩ
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