Sharp DX-361HM - Page 21

®
Signal
Mode
Instrument
Oscilloscope Remarks
connection
Reset Power on
<jj>
Pulse "high"
X-TAL Stand-by
<8>
4 MHz See frequency on crystal (X1).
TRAY IN
Push
tray
<@>
"high" See Fig. 21.
"high" when tray is closed
TRAY OUT
Open/close
<@>
"low" See Fig. 21. "low" when tray is opened
1
2
C Power on, Play
4J>
Activity "high" when starting up
As
for numbers of instrument connection refer to the SCHEMATIC DIAGRAM and WIRING SIDE OF P.W.BOARD.
Table 1 Signals of IC4
ANTI SKATING PULSES
TRISTATE
1-0 PORT OF IC4
CLOSE 5
STOP 2.5
OPEN 0
PULS HIGH PULS LOW
T
Figure 21
Service Position
0
.j.
~ Track
Track
~
Power ON
B-1
The display tube
...-----., does not display
Service position
O.
Power 'r.-----------J1lo-i A-1
OFF I
Check of the
photodiodes
Connectors CNS1 and CNP1.
Photodiodes (See Table 2).
Check point
.- -1 The photodiodes 1l-----------------_..j---=-----=-:-:-:::---:-=~__:1
do not go on. I
B-2
Service Position 1
.j.
Track ~
Check point
Connectors CNS1 and CNP1.
Output from pins 17 (LO)
and 18 (LM) of
the IC1.
Output/Input from pin 6 (SI/RD)
of IC1.
Laserdiode.
See
Table 3 and
f---------------1 laser current
adjustment.
.- -1 The Laser does
not go on.
B-3
I
Power I
OFF
Check point
Connectors CNS1 and CNP1 .
Output from pins 15 (FE) and
16
(FE lag) of IC1.
Ope-amp. IC3 and resistor R15.
B-4
...- ., The focus does
not function.
See Table 4 and
f--------------j focus offset
adjustment.
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