Inhaltsverzeichnis
Werbung
Abgleichvorschriften / Adjustment Procedures
Adjustment
9. FM-Reference
Playback
Level Adjustment
Call up the service function:
for Automatic
– Press the
(" CODE – – – – " is indicated in the display).
Contour Control
– Enter the code number
button (" SERV " is indicated in the display).
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
1. VXO Frequency,
Frequency counter: ............................................. MP
C2365 (XO)
Playback (PAL signal)
2. Chroma Record
Feed in a colour bar test pattern (PAL) without colour
Voltage,
carrier.
R3693 (CWV)
Oscilloscope: ............................ Head Amplifier, MP
Record.
Short-circuit R3684 (video circuit stage).
Feed in a colour bar test pattern with colour carrier.
3. Pilot Burst
Feed in a colour bar test pattern (PAL).
Amplitude
Oscilloscope: ...................................................... MP
EE Mode with loaded S-VHS cassette.
4. 627kHz Comb
Oscilloscope: ...................................................... MP
Filter, R3023 (CF)
Trigger: ........... Video Circuit Stage, HI pulse 1530-(26).
Play back a self-made recording (red test signal).
3 - 10
Preparation
Z
button on the remote control handset
4 9 3 4
and press the
Preparation
Adjustment Procedure
1
. The display shows on the left " PICT "
Press the button
and on the right " A1 ". On successful adjustment the video
recorder switches to Pause
To cancel the service function: Press the "Standby" button
O
or disconnect the recorder from the mains.
Adjustment Procedure
41
Set frequency with C2365 (XO) to 433619MHz.
35
Note down the amplitude of the FM-signal.
With R3312 set the amplitude to
signal amplitude.
Remove the short circuit.
With R3432 (PBA) set the pilot burst amplitude to 110%
43
of the PAL burst amplitude.
44
With R3023 (CF) set the signal as shown in the oscillo–
grams below.
200µs/cm
GV470S...
1
/
of the noted down FM-
4
Incorrect
CORRECT
Incorrect
GRUNDIG Servicetechnik
Werbung
Inhaltsverzeichnis
