Service Test Programme & Special FunctionsGV 27 �, GV 47 �, GV 7�
Level 60: Audio Level Adjustment of IC7780 (FV, option)
2. Special Functions
The audio level is to be adjusted on replacement of the stereo decoder
(IC7780) or the EEPROM (IC7890).Continuous Operation Test
Preparation before calling up this level:The continuous recording and playback test is part of the service test
� Connect the AF millivoltmeter to the EURO-AV1 socket, contact 1programme and helps to find occasionally appearing faults. The
� Feed in a white test pattern with sound carrier ("stereo" sounddiscovered fault is stored in the EEPROM and is saved even if the VCR
modulation, right channel 1kHz sine, ?27kHz deviation) to the aerialis disconnected from the mains.
input socket
Calling up the Continuous Operation Test
� EE operating mode
� Start the continuous test with button l (Record) or e (Play).
On calling up adjustment level 60, the actual setting "0"�"9" is
Terminating the Continuous Operation Test
displayed. Set the output level with the button "�" or "+" to 500mVrms
� Press n (STOP) button or 8 "STANDBY" button.
?50mV. Each time one of these buttons is pressed the level changes
by 0.5dB and the set value is stored in the EEPROM.
Level 61: Audio Channel Separation of IC7780 (FV, option)
Cleaning the Headwheel
The audio channel separation is to be adjusted on replacement of the
stereo decoder (IC7780) or the EEPROM (IC7890).The video heads are cleaned briefly during the period the video tape
is threaded in. By pressing the e button (min. 5s) the cleaning in play
Preparation before calling up this level:
mode can be activated for approximately 10s. In doing so, the tape
� Connect the AF millivoltmeter to the EURO-AV1 socket, contact 3
transport is stopped and the video head cleaning roller is pressed
(left channel)
against the headwheel. Afterwards, play is continued.
� Feed in a white test pattern with sound carrier ("stereo" sound
modulation, right channel 1kHz sine, ?27kHz deviation) to the aerial
input socket.
� EE operating mode
Erasing the RAM and EEPROM
On calling up adjustment level 61, the actual setting "0"�"49" is
Depress the 8 "STANDBY" on the machine while connecting it to the
displayed. Set the noise voltage of the left channel with the button "�
mains and hold the button for at least 5s.
" or "+" to minimum. Each time one of these buttons is pressed the level
The EEPROM and the internal processor RAM are erased and
changes by 0.1dB and the set value is stored in the EEPROM.
initialized. In doing so, the user programmable station memory and the
Level 62: Standard Sound Playback Level of IC7850 (AF, option)timer data are erased. The specific data of the VCR, the tape deck
The standard sound playback level needs to be adjusted on replace-parameters, VCR option codes, and the adjustment values remain
ment of IC7850 or of the EEPROM (IC7890).unchanged.
Preparation before calling up this level:
� Connect the AF millivoltmeter to the EURO-AV1 socket, contact 1
� Feed in a sound signal (1kHz sine, 0.7Vrms) to EURO-AV1 socketReplacement of the EEPROM IC7890
contacts 2 and 6.
Attention:On replacement of the EEPROM, IC7890, the VCR option
� Record the sound signal.
codes, Level 40, must be entered and the software must
On calling up Level 62, the actual setting "0"�"15" is displayed. be readjusted according to the Levels 51, 52, 53, 60, 61Play
back the recorded sound signal (standard sound playback) and set theand 62.
output level with the "�" or "+" button to 500mV ?50mV. Each time
rms
one of these buttons is pressed the level changes by 1dB and the set
value is stored in the EEPROM.
Data-Programmer "IDP2"
Level 99: Timer Clock Output
Note: The transfer of the channel settings stored in the Data-Pro-
For adjusting the timer clock (Level 53), the timer oscillator frequency
grammer is only possible in VCR1 Mode.
(approx. 2048Hz) must be measured at this level on IC7201-(80)
� Press "EJECT" button (to eject the loaded cassette).
"HEST" of the keyboard control unit (DC) (resolution: 6 digits at least).
� Press the n (STOP) button on the remote control and
Note it down (f).
messthe "INSTALL" button on the video recorder in that order and hold
them down for at least 5 seconds. The display will then show
Note:
"MENU".
After selection of this level, the display is dark and no function of the
� Transfer the channel settings with the Data-Programmer "IDP2"
VCR is active. This level and the service test programme can be
(see Operation Manual "IDP2").
terminated only by disconnecting the VCR from the mains.
� On completion of the data transfer press 8 "STANDBY".
k 2 - 6GRUNDIG Service |
ACEC
