Abgleichvorschriften / Adjustment Procedures
GV470S…
3 - 10
GRUNDIG Servicetechnik
Adjustment
Preparation
Adjustment Procedure
9. FM-Reference
Level Adjustment
for Automatic
Contour Control
Playback
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 button
1
. The display shows on the left "
PICT
"
and on the right "
A1
". On successful adjustment the video
recorder switches to Pause
To cancel the service function: Press the "Standby" button
or disconnect the recorder from the mains.
3.2 S-VHS Board – Chrominance (SF)
Test Equipment: Oscilloscope, Frequency Counter, 10:1 Test Probe.
Service work after replacing the …
… S-VHS Board: –
… IC7470: Adjustment no. 1…3
Adjustment
Preparation
Adjustment Procedure
1. VXO Frequency,
C2365 (XO)
2. Chroma Record
Voltage,
R3693 (CWV)
3. Pilot Burst
Amplitude
4. 627kHz Comb
Filter, R3023 (CF)
Set frequency with C2365 (XO) to 433619MHz.
Note down the amplitude of the FM-signal.
With R3312 set the amplitude to
1
/
4
of the noted down FM-
signal amplitude.
Remove the short circuit.
With R3432 (PBA) set the pilot burst amplitude to 110%
of the PAL burst amplitude.
With R3023 (CF) set the signal as shown in the oscillo–
grams below.
Incorrect
CORRECT
Incorrect
200
µ
s/cm
Frequency counter: ............................................. MP
41
Playback (PAL signal)
Feed in a colour bar test pattern (PAL) without colour
carrier.
Oscilloscope: ............................ Head Amplifier, MP
35
Record.
Short-circuit R3684 (video circuit stage).
Feed in a colour bar test pattern with colour carrier.
Feed in a colour bar test pattern (PAL).
Oscilloscope: ...................................................... MP
43
EE Mode with loaded S-VHS cassette.
Oscilloscope: ...................................................... MP
44
Trigger: ........... Video Circuit Stage, HI pulse 1530-(26).
Play back a self-made recording (red test signal).