Grundig GV 6400 HiFi Service Anleitung Seite 15

GV 6400 ..., GV 6401 NIC
– Tape deck sensors
For checking the tape deck sensors (Init switch, threading tacho,
tape start, tape end, record lock, winding tacho left / right) the
operating positions are indicated on the display by means of one
digit. The indicated value changes with each operation of the
sensors.
– VCR function
The VCR function code (see Level 02 – Error Status / VCR Function
Table) indicates the position of the cassette compartment and of the
threading roller units.
Level 04: Operating Hours Meter
The operating hours meter indicates the number of hours the headwheel
has been rotating.
Operating Hours Meter
Level 10: Tape Deck Sensors and VCR Function
without Drive to the Tape Deck
At this level, the tape deck sensors are indicated on the display as
explained at Level 03. Additionally, the VCR functions can be selected
and the respective signal paths are released for fault finding (without
tape deck).
The tape deck is not driven at this level.
Level 40: VCR Option Codes
The VCR option codes "A"..."F" serve the purpose of activating the
respective software of the different VCR versions stored in the mask-
programmed µC's. The option code is stored in the EEPROM
– When calling up Level 40 the request for entering option code "A"
( VPS PDC ) appears on the display.
LP MAN
STOP TIMER 1 2
– Select the desired option code "A"..."F" with the "–" or "+" button.
– Enter the option code for example option code "A":
– Enter option code "A", see VCR type plate (e.g. "004") on the
remote control.
Attention: All functions will be available only if the option code
has been entered correctly.
– Confirm the entered code with the "STORE" button on the
recorder.
For checking the entered code, the display shows for
approximately 5s the option code "A" as a hexadecimal number,
e.g. "
VPS PDC
LP MAN
STOP TIMER 1 2
Subsequently, the VCR switches automatically back to the
request for entering the next option code.
– The option codes "B"..."F" are entered in the same way as option
code "A".
– Checking the option codes:
– The hexadecimal option codes can be checked by pressing the
"STORE" button on the VCR without previously entering an option
code.
Level 51: Headwheel Position Indicator Adjustment
This adjustment is necessary on replacement of the headwheel or
EEPROM (IC7890).
Preparation before calling up this level:
– Play the test cassette.
This adjustment is started automatically on calling up the level. On
successful completion the resulting value is stored in the EEPROM.
Afterwards the VCR switches to standby mode.
If the adjustment is not carried out successfully the VCR ejects the test
cassette. Cause: Test cassette, headwheel or technical defect (e.g. µC)
GRUNDIG Service
VPS PDC
LP MAN
STOP TIMER 1 2
Level
VPS PDC
LP MAN
STOP TIMER 1 2
Level
".
Level 52: ACC Adjustment (Automatic Contour Control, optional)
The ACC needs to be adjusted on replacement of the headwheel or
EEPROM (IC7890)
Preparation before calling up this level:
– Feed in a red raster test pattern
– Play back the record / play cassette.
This adjustment is started automatically on calling up this level (recording
for 4s in SP/LP mode each and while playing back this recording the
VCR is adjusted) . The resulting value is stored in the EEPROM on
successful completion of this adjustment. Afterwards the VCR switches
to standby mode.
If the adjustment is not carried out successfully the VCR ejects the test
cassette. Cause: Test cassette, headwheel or technical defect (e.g.
µC).
Level 53: Timer Clock Adjustment
Preparation before calling up this level:
– Measure the timer clock output, Level 99, and note down the
measured value (f ).
mess
– Calculation of the correction value:
f = measured frequency
mess
f = desired frequency (2048.0000Hz)
soll
6
1 x 10 x (f
mess
Deviation =
f
soll
Deviation
Correction value =
0.763
Example:
f = 2047.9700Hz
mess
f = 2048.0000Hz
soll
6
1 x 10 x (2047.97Hz – 2048Hz)
-14.648 =
2048Hz
-14.648
108.80 = +128
0.763
Rounded correction value to be entered: 109
If the calculated correction value lies outside the range from 0...255
the quartz Q1297 may be technically defective.
Entering the correction value
– On calling up Level 53 the display shows the request for entering the
correction value (
– Enter the correction value (rounded) and confirm the value by
pressing the "STORE" button on the VCR. For checking the entered
number, the display shows for approximately 5s the hexadecimal
correction value 109 "
Checking the correction value:
– The hexadecimal correction value can be checked by pressing the
"STORE" button on the VCR without previously entering the value.
Level 60: Audio Level Adjustment of IC7780 (PAF-SD)
The audio level is to be adjusted on replacement of the stereo decoder
(IC7780 on the Family Board II) or the EEPROM (IC7890 on the Family
Board).
Preparation before calling up this level:
– Connect the AF millivoltmeter to the EURO-AV1 socket, contact 1
– Feed in a white test pattern with sound carrier ("stereo" sound
modulation, 1kHz sine, ±27kHz deviation) to the aerial input socket
– EE operating mode
Having called up this adjustment level, the output level is to be set with
the button "-" or "+" to 500mV
rms
buttons is pressed the level changes by 0.5dB and the set value is
stored in the EEPROM. The value "0"..."9" is indicated on the display.
Level 61: Audio Channel Separation of IC7780 (PAF-SD)
Audio channel separation is necessary on replacement of the stereo
decoder (IC7780 on the Family Board II) or the EEPROM (IC7890 on
the Family Board).
Preparation before calling up this level:
– Connect the AF millivoltmeter to the EURO-AV1 socket, contact 3
(left channel)
– Feed in a white test pattern with sound carrier ("stereo" sound
modulation, 1kHz sine, ±27kHz deviation) to the aerial input socket
– EE operating mode
General Section
– f )
soll
+128
VPS PDC ).
LP MAN
STOP TIMER 1 2
".
VPS PDC
LP MAN
STOP TIMER 1 2
± 50mV. Each time one of these
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