Drive Mechanism
GV 30…, GV 50…
k
5 - 20
GRUNDIG Service
6. Operating the Mechanism in the Service Test Mode
The Service Test Mode is a special function for servicing allowing the
mechanism functions to be checked and the cassette tape to be
ejected forcibly.
The overview of the operating modes Fig. 7.1 shows the switching
sequence of the individual operating modes.
The respective output signal at the mode switch S3500 can be seen
from the table Fig. 7.3.
6.1 Activating the Service Test Mode
– The Service Test Mode can be activated from all the other functions
but the Standby mode.
– With the power on, press the
Clear button on the remote control
handset for more than 15 seconds.
6.2 Service Test Mode Functions
– By pressing button
Ü
on the local keyboard or
C
on the remote
control handset, the operating modes can be changed in the loading
direction from EJECT to FF/REW.
The tape drum motor and the capstan motor (Pos. 70500) will not
rotate.
– By pressing the button
*
on the local keyboard or
D
on the remote
control handset, the operating modes can be changed in the
unloading direction from FF/REW to EJECT.
At this time, the tape drum motor will not rotate but the capstan motor
(Pos. 70500) will rotate in the direction in which the tape is wound by
the supply reel.
Note: When checking the mechanism mode positions without a
cassette being loaded take care that the opening lever for
the cassette lid (Pos. 040E) is unlocked (Fig. 5.1).
6.3 Terminating the Service Test Mode
– To leave the Service Test Mode press the
A
button.
– Afterwards, normal operations can be performed.
7. Overview of Operating Modes
7.1 Sequence of Operations
HEX
DATA
Mechanism Operating Modes
EJECT
IN REW
INITIAL
REVIEW (R-SEARCH)
STILL/SLOW
PLAY/STOP
BRAKE
FF/REW
IDLER
06
02
00
07
00
01
00
01
00
02
00
03
00
05
00
04
00
06
Fig. 7.1
7.2 Mechanism Operating Mode Positions of the Mode Switch
S3500 (shown in "EJECT" position)
X
Y
Z
C
INITIAL
IN REW
EJECT
FF/REW
BRAKE
PLAY/STOP
STILL/SLOW
IDLER
REVIEW
(R-SEARCH)
Fig. 7.2
7.3 Signal Table of Mode Switch S8001
Terminal
C in Fig. 7.2 is the ground connection.
At L (Low) level, the terminals
X, Y, Z are connected to ground via
terminal
C.
Fig. 7.3
HEX DATA
X
Y
Z
(POS SW 2)
(POS SW 1)
(POS SW 0)
00
H
H
H
01
H
H
L
02
H
L
H
03
H
L
L
04
L
H
H
05
L
H
L
06
L
L
H
07
L
L
L
