Hitachi DE 55 Technical Information

Page 1

HITACHI TK No. T471E
smvrc: MANUAL 8,15 -‚¬533, M. w,

TECHNICAL INFORMATION

This Technical Information describes the new circuit (micro- /
processor and peripheral circuits) of the D-E55. Refer to
Service Manual Not 1470 for other items.

V
CONTENTS
\2 Block diagram 2
Explanation of new circuit . 3
Test program operation procedure _ 4
IC101 pin functions .............. . 5
Timing chart ..................................... .. 7
V CAUTIONS ON USING MOS IC
1. The MOS le are inserted into a black sponge fora. The worker should be grounded during work
shipment This sponge is conductive and is used because the human body, clothes made from syn-
to prevent destruction by short-circuiting between thetlc fibers, nylon gloves. etc., may be charged
leads. with several thousand volts of static electricity
Do not remove the i0 from this sponge during 4. Be sure to ground measuring instruments such as
storage. Avoid removing le from the sponge and oscilloscopes, VTVMs, etc. when they are used.
do not place on plastic which is likely to be
ohanrged with static electricity or inserting it into
Styrofoam
2. Be sure to ground the soldering iron or use a low
voltage soldering iron for soldering bcause a high
voltage may be applied due to a leakage from the
soldering iron.
V

STEREO CASSETTE TAPE DECK

December 1980 TOKAI WORKS