Operating The Mechanism In The Service Test Mode; Overview Of Operating Modes - Grundig GMI4000 Serviceanleitung

Drive Mechanism

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
Mechanism Operating Modes
DATA
06 EJECT
02
IN REW
00
07 INITIAL
00
01
00
01
REVIEW (R-SEARCH)
00
02
IDLER
00
03 STILL/SLOW
00
05
PLAY/STOP
00
04 BRAKE
00
06
FF/REW
Fig. 7.1
5 - 20
7.2 Mechanism Operating Mode Positions of the Mode Switch
S3500 (shown in "EJECT" position)
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.
HEX DATA X
(POS SW 2)
00 H
01 H
02 H
03 H
04 L
05 L
06 L
07 L
Fig. 7.3
GV 30..., GV 50...
Y Z
(POS SW 1) (POS SW 0)
H H
H L
L H
L L
H H
H L
L H
L L
GRUNDIG Service