Grundig GV 640 NIC Betriebsanleitung Seite 25

GV 64 ..., GV 65 ..., GV 66 ..., SE 6106 HiFi
4. Family Board
Service work after changing the Family Board:
– 3. Tuner/Modulator Interface ................................... Adjustment no. 5
– 4.1 Sequence Control / Deck Electronics (CC / DE) . Adjustment no. 1
– 4.2 Video/Chroma (VS): ............................................ Adjustment no. 4
– 5.1 IO Board – FM Sound (AU) ................................. Adjustment no. 1
– 5.2 IO Board – Standard Sound (AU) ................... Adjustment no. 1, 2
4.1 Family Board – Sequence Control / Deck Electronics (CC / DE)
Test aids: Test Cassette.
Service work after changing the ...
... Family Board: Adjustment no. 1
... Headwheel: Adjustment no. 1
4.2 Video/Chroma (VS): Adjustment no. 4
... IC7025: Adjustment no. 1
3. Frontend (FE): Adjustment no. 3, 4
4.2 Video/Chroma (VS): Adjustment no. 4
Service Test Programme – Level 40, enter VCR Option Code
Adjustment
1. Headwheel Position Insert a test cassette.
Indicator Call up the Service Function with the remote control:
– Press button "CODE" repeatedly until "CODE ----" appears on the
display.
– Enter 4 9 3 4 in this order and confirm with button G.
4.2. Family Board – Video/Chroma (VS)
Test equipment / aids: Oscilloscope with 10:1 Test Probe, Digital Voltmeter, Colour Generator.
Service work after changing the ...
... Family Board, headwheel or IC7600: Adjustment no. 4
... IC7320: Adjustment no. 1, 2, 3; Frontend (FE) / Family Board – Tuner/Modulator Interface (TM) – Adjustment no. 5
Adjustment
1. Luminance Writing Feed in and record a PAL white test pattern of 100% saturation.
Oscilloscope: ............................................................. MP
Current, R3479
(AY)
2. PAL Chroma Feed in and record a PAL white test pattern of 100% saturation.
Writing Current, Measure the FM signal at MP
it down.
R3387
(CAP)
Connect MP
Feed in and record a PAL red raster test pattern.
Oscilloscope: ............................................................ MP
3. S-VHS-PB Play back a100% white test pattern (recording made on the machine).
Detection Measure the voltage at MP
note it down.
Reference Level
– S-VHS Digital Voltmeter: ....................................................... MP
R3508
(REFS)
– VHS Connect MP
R3503 Digital Voltmeter: ....................................................... MP
(REFV)
4. FM Reference Level Feed in a red raster test pattern.
for "ACC (Automatic Insert a record/play cassette.
Contour Control) plus Call up the Service Function with the remote control:
– Press button "CODE" repeatedly until "CODE ----" appears on the
Studio Quality"
display.
– Enter 4 9 3 4 in this order and confirm with button G.
4.3 Family Board – OSD (OS)
Test equipment / aids: Frequency counter with 10:1 Test Probe.
Service work after changing the Family Board: –
Adjustment
1. Quartz Oscillator,
Connect IC7690-(23) to ground.
C2695 Frequency counter: ................................................... MP
(SC)
EE mode
2. LC Oscillator (for Connect IC7690-(23) to ground.
width of characters), Frequency counter: ................................................... MP
L1104 EE mode
(LC)
GRUNDIG Service
Preparation
Preparation
52
with an oscilloscope and note
32
to ground.
34
with the digital voltmeter and
33
to ground.
Preparation
Adjustment Procedure
Press button "CODE". Enter the figures 5 1 in this order and confirm
with "CODE". The message "ADJUST" appears on the display.
On successful completion of this adjustment the display shows
"READY".
If the adjustment was not successful "ERROR" appears on the
display. Cause: Test cassette, headwheel or technical defect.
Terminate the Service Function by pressing button A or by
disconnecting the VCR from the mains.
Adjustment Procedure
With R3479 adjust the FM signal to 300mV
(AY)
32
With R3387 set the chroma signal to 50% of the FM signal
(CAP)
52
(MP ).
Remove the ground connection from MP
51
35 With R3508 adjust the voltage so that its level is 0.35V
(REFS)
higher than that measured at MP
With R3503 adjust the voltage so that its level is 0.25V
(REFV)
36 higher than that measured at MP
Remove the ground connection from MP
Press button "CODE". Enter the figures 5 2 in this order and confirm
with "CODE". The message "ADJUST" appears on the display.
On successful completion of this adjustment the display shows
"READY".
Terminate the Service Function by pressing button A or by
disconnecting the VCR from the mains.
Adjustment Procedure
With C2695 set the frequency to 17.734475MHz
Remove the ground connection from IC7690-(23).
9
For initialization switch the VCR off and on.
With L1104 set the frequency to 6.6MHz
10
Remove the ground connection from IC7690-(23).
For initialization switch the VCR off and on.
Adjustment Procedures
.
PP
32
.
34
.
34
.
33
.
±
50Hz.
±
0.1MHz.
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