Adjustment Procedures; Chassis Board - Grundig GV 29 EURO Manuel De Service

Adjustment Procedures

Adjustment Procedures
GB

1. Chassis Board

View of Solder Side
Test equipment / aids: Two-channel oscilloscope with 10:1 probes, voltmeter, colour generator, test cassette, branded video cassette
Service works on replacement of ...
... the tape drum: Adjustment No. 1, 2
... IC304: Adjustment No. 1, 2
Adjustment
1. Headwheel Oscilloscope:
Position Indicator – Channel 1 (trigger): ............................................. J1099
– Channel 2: ................................. Euro-AV1-(19) socket
Play test cassette.
When the playback picture appears touch the K button
three times immediately. The automatic adjustment mode
will start.
2. Still Picture Feed a CCVS signal into the EURO-AV1 socket and
Optimisation record it in Standard play mode.
Play back this recording and press button Ó .
3 - 2
J1100 J1099
TP101
IC301
Preparation
C3016
(Parts side)
Adjustment Procedure
• Automatic adjustment: The adjustment process is
indicated on the display. The meter counts from "P: 0:01"
to maximum "P: 2:55". The meter will stop at the set value.
The value can then be adjusted manually.
• Manual adjustment: Use the buttons Ü or * to set the
head switching pulse to 6.5 ±0.5 lines before the vertical
sync pulses.
Channel 2:
1V/div 50µs/div
Video output
Channel 1:
2V/div 50µs/div
Head switching pulse
Press button to leave the test mode. The indication
"P:– : –" appears for a short time on the display.
With buttons C / D set the still picture according to your
best personal impression.
GV 29 EURO, GV 9300 EURO
6.5 ±0.5H (lines)
V-sync
GRUNDIG Service