Sony HDW-750 Maintenance Manual page 513

6 C005 : FUNCTION CAM POS 6 6
6 6
Indicates the detecting position of the function gear.
1. Select "C005: FUNCTION CAM POS" and press the rotary
encoder.
2. Insert a working tape (blank tape: BCT-40HD that is commercial-
ly available) and check to see that the arrow mark (→) moves.
3. Check to see that the arrow mark (→) moves when the PLAY
button is pressed.
4. Check to see that the arrow mark (→) moves when the STOP
button is ipressed.
5 Check to see that the arrow mark (→) moves when the tape
EJECT button is pressed.
m
If the arrow mark (→) does not move even when the tape is
inserted or ejected, check the followings.
. Function cam sensor (PH301 to PH304/MDC-13 board)
. Cam position detector circuit (Q301 and others/MDC-13 board,
IC1 and others/SS-92 board)
. Signal path between the MDC-13 board and the SS-92 board
If the function cam does not operate correctly, the SLACK error
occurs. Take an appropriate measure in accordance with the corre-
sponding error code referring to Section "3. Error Diagnostics".
n
The display on monitor changes in accordance with the
status of the function cam sensor as shown in the Function
Cam Code Transition Table.
The status of each sensor can be checked by either one of
the following two methods.
1. Observe the check-land (CL301 to CL304/MDC-13
board) with an oscilloscope. The SS-92 board must
have been removed earlier to connect an oscilloscope
to the check-land. As the function cam can be moved
of its position by hand, the sensor status also changes.
Move the function cam by hand as follows and check
that the sensor status changes accordingly as shown in
the table.
. While pushing the manual eject gear with a flat-head
screwdriver tip, rotate the manual eject gear in the
clockwise direction (unloading direction) or counter-
clockwise direction (loading direction). (Refer to
Section 1-11.)
n
If the front lid has been opened, never rotate the gear
in the clockwise direction.
2. Connect the SS-92 board connector (CN201) and the
MDC-13 board connector (CN201) with the use of the
EX-764 board and the two flexible card wires (45
pins). Check the function cam sensor status with an
oscilloscope referring to the function cam code
transition table.
In this case, the function cam is controlled of its
position automatically by the SS-92 board. Therefore,
check that the function cam sensor status matches with
the monitor display as shown in the Function Cam
Code Transition table.
HDW-750/750CE V1
SERVO CHECK MENU
C005:FUNCTION CAM POS
1.B0
2.EJECT
3.B1
→
4.STBY
5.B2
6.LOAD1
7.LOAD2
8.LOAD
Function Cam Code Transition Table
Detecting Sensor status (MDC-13 board)
position
Monitor CL304 CL303
display
(CN201-39) (CN201-40) (CN201-41) (CN201-42)
B0 H L
EJECT H L
B1 H L
STBY H L
B2 H H
LOAD1 H H
LOAD2 H H
LOAD H H
LIMIT L H
B3 L H
STOP L H
B4 L H
RUN L L
B5 L L
CL L L
B6 L L
11-3. Contents of Menus
9.LIMIT
10.B3
11.STOP
12.B4
13.RUN
14.B5
15.CL
16.B6
CL302 CL301
L L
L H
H H
H L
H L
H H
L H
L L
L L
L H
H H
H L
H L
H H
L H
L L
MDC-13 board (A side)
11-11