Sharp QT-CD180(BL) Service Manual page 9

CD SECTION
Since this CD system incorporates the following automatic adjustment function, when the pickup is replaced, it is not necessary
to readjust it.
Since this CD unit does not need adjustment, the combination of PWB and laser pickup unit is not restricted.
TEST MODE
Start
While holding down the "Stop" and "Up" button at same time, move the FUNCTION switch to "CD".
1. When the CD LID switch is in the OFF position, (CD LID is open) the unit will be able to enter the test mode.
Note
However, can use the "UP/CUE" and "DOWN/REVIEW" button only.
2. You can only move the pickup.
3. The LCD display should be the same as it is for normal CD operations.
Operation The use of the "UP/CUE" button will move the pickup to the outermost position.
The use of the "DOWN/REVIEW" button will move the pickup to the innermost position.
LCD MODE
After connecting of the 10 kohm resistor between IC802 27 pin and GND and holding down the "Stop" and "Up"
Start
button at same time, move the FUNCTION switch to "CD".
Display
LASER LIGHTING CONFIRMATION
1. Remove the front cabinet according to the disassembly method.
2. Short the TP of the Figure 9-1 to turn on the CD LID switch (SW810).
3. While holding down the "Stop" and "Up" button at same time, move the FUNCTION switch to "CD".
4. Open the CD LID and press the PLAY button. The laser lights up for a few seconds. (At this time, the pickup lens moves
up and down and adjusts the focus to check if there is a disc or not.)
PREPARATION FOR LASER LIGHT UP
1. Before the laser light up, CD LID switch (SW801) terminals have to be short with the solder.
Resistor of 330ohm is put from 27 pin of IC802, and you must connect it to GND of PWB. (Refer to PWB of Figure9-1.)
MAIN
PWB-A1
OPEN/CLOSE
SW810
CD LID
SWITCH
330 ohm
Resistor
1
TP
PLAY
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C844
C847
C853
80
81
C846
C855
85 75
90 70
95
65
100
60
1
5
IC802
10
15
20 40
25 35
27pin
30 31
GND R843
R821
FW806 10
1 2 3 4 SW102
CNP101
RECORD/PLAYBACK
REC. SW102
C
A B D
H G F E
Figure 9-1
– 9 –
R830 C819
R829
C829
C863
C828
C830
55
C841
51
50
45
R824
C842
C843
BI803
1 6
QT-CD180
13 12
15 10
1
20 5
C820
1
24
C816
5
C801
R804
8
C802
C815
Q801
C817
B E
C
R801
1
1 28
25
5
7 22
21
8
10 20