GV 27 EURO, GV 7� EUROService Test Programme & Special Functions
Level 03: Man. Tracking, Tape Deck Sensors and VCR FunctionLevel 51: Headwheel Position Indicator Adjustment
� Manual trackingThis adjustment is necessary on replacement of the headwheel or
The tracking position in the service test programme is set to mid-EEPROM (IC7890).
position. By pressing the "+" or "�" button it is possible to change the
Preparation before calling up this level:
tracking position to the required position for tape transport adjust-
� Play the test cassette.
ment (see chap. 5 � Tape Deck).
� Tape deck sensorsThis adjustment is started automatically on calling up the level. During
For checking the tape deck sensors (Init switch, threading tacho,the adjustment process the display shows . On successful
tape start, tape end, record lock, winding tacho left / right) thecompletion the resulting value is stored in the EEPROM. The display
operating positions are indicated on the display by means of onethen shows .
digit. The indicated value changes with each operation of the
If the adjustment is not carried out successfully the machine ejects the
sensors.
cassette and terminates the service test programme. Cause: Test
� VCR function
cassette, headwheel or technical defect (e.g. mC)
The VCR function symbols ( n l r e ) indicate the position of the
cassette compartment and of the threading roller units.Level 52: ACC Adjustment (Automatic Contour Control, option)
The ACC needs to be adjusted on replacement of the headwheel or
EEPROM (IC7890)
Preparation before calling up this level:
� Feed in a black raster test pattern without burst to EURO-AV1 socket
� Play back the record / play cassette.
(FTA) (INIT)
(RECP) (Option)This adjustment is started automatically on calling up this level (record-
ing for 10s in SP/LP mode each and while playing back this recording
End of Tape
VCR function
the VCR is adjusted). During this process the display shows
Init switchRight reel tacho
Beginning of tape.The resulting value is stored in the EEPROM on successful
completion of this adjustment. The display then shows .
Threading tachoLeft reel tacho
If the adjustment is not carried out successfully the machine ejects the
Record prodection
cassette. Cause: Preparation, cassette, headwheel or technical defect (e.g.
Level 04: Operating Hours MetermC).
The operating hours meter indicates the number of hours the head-
Level 53: Timer Clock Adjustment
wheel has been rotating.
Preparation before calling up this level:
� Level 99 - measure the timer clock output and note down the
measured value ().f
mess
� Calculation of the correction value:
f = measured frequency
Level 10: Tape Deck Sensors and VCR Functionmess
f= desired frequency (2048.0000Hz)
without Drive to the Tape Decksoll
At this level, the tape deck sensors are indicated on the display as1 x 106 x (fmess � fsoll)
Deviation =
explained at Level 03. Additionally, the VCR functions can be selectedfsoll
and the respective signal paths are released for fault finding (without
Deviation
tape deck).Correction value = +128
0.763
The tape deck is not driven at this level.
Example:
Level 40: VCR Option Codes
f = 2047.9700Hz
The VCR option codes "A"�"E" serve the purpose of activating themess
f= 2048.0000Hz
respective software of the different VCR versions stored in the mask-soll
programmed mC's. The option code is stored in the EEPROM.6
1 x 10 x (2047.97Hz � 2048Hz)
-14.648 =
� When calling up Level 40 the request for entering option code"A"2048Hz
() appears on the display.
-14.648
� Select the desired option code "A"�"E" with the "�" or "+" button.108.80 = +128
0.763
� Entering the option code, for example option code "A":
� Enter option code "A", see VCR type plate (e.g. "191"), on theRounded correction value to be entered: 109
remote control.If the calculated correction value lies outside the range 0�255 the
Attention:All functions will be available only if the option codequartz Q1297 may be technically defective.
has been entered correctly.
Entering the correction value
� Confirm the entered code with the "OK" button.
� On calling up Level 53 the display shows the currently valid correc-
The display shows for approximately 3s . Afterwards,
tion value "0"�"255".
the recorder switches back automatically requesting another
� Enter the correction value (rounded) and confirm the value by
entry and shows the stored value .
pressing the "OK" button. As a check, the display shows for
� The option codes "B"�"E" are entered in the same way as option
approximately 3s .
code "A".
� Checking the option codes:
� The option codes "A"�"E" can be checked by pressing the "�" or
"+" button without having entered an option code previously.
GRUNDIG Service2 - 5 k |
ACEC
