JVC DR-MV2SEU Service Manual page 8

1.3 PREPARATION FOR SERVICING
1.3.1 How to Enter the Service Mode
1.3.1.1 About Optical Sensors
Caution:
An optical sensor system is used for the Tape Start and End
Sensors on this equipment. Carefully read and follow the in-
structions below. Otherwise the unit may operate erratically.
What to do for preparation
Insert a tape into the Deck Mechanism Assembly and press
the PLAY button. The tape will be loaded into the Deck Mech-
anism Assembly. Make sure the power is on, connect TP507
(S-INH) to GND. This will stop the function of Tape Start Sen-
sor, Tape End Sensor and Reel Sensors. (If these TPs are
connected before plugging in the unit, the function of the sen-
sors will stay valid.) See Fig. 1.
Q503
Note:
Because the Tape End Sensors are inactive, do not run a tape
all the way to the start or the end of the tape to avoid tape dam-
age.
1-8 (No.YD087)
Q504
S-INH
TP501
Fig.1