FUNAI W4A-A4180DB - Preparation for Servicing; How to Enter the Service Mode; About Optical Sensors

1-5-1 E9G02PFS
PREPARATION FOR SERVICING
How to Enter the Service Mode
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 instructions below. Otherwise the unit
may operate erratically.
What to do for preparation
Insert a tape into the Deck Mechanism Assembly and
press the [PLAY] (VCR) button. The tape will be
loaded into the Deck Mechanism Assembly. Make
sure the power is on, connect TP501 (S-INH) to GND.
This will stop the function of Tape Start Sensor, Tape
End Sensor and Reel Sensors. (If these TPs are con-
nected before plugging in the unit, the function of the
sensors will stay valid.) See Fig. 1.
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 damage.
Q504
Q503
TP501
S-INH
Fig. 1