Sharp XL-40 Service Manual ▷ View online
– 37 –
XL-40H/50H
• Focus servo sawtooth wave failure.
Is +6.2V applied to the pins 1 and 30 (VCC) of IC804 ?
Is sawtooh wave output to the pin 48 (FOO) of IC802 ?
IC802 is faulty.
No
Yes
Yes
Is sawtooth wave obtained between pins 25 and 26 of IC804 ?
No
No
Check the PWB pattern
between pin 2 of IC804
and pin 58 (CD STB) of
IC701.
between pin 2 of IC804
and pin 58 (CD STB) of
IC701.
Is +5V applied to the pin 2
(MUTE) of IC804 ?
(MUTE) of IC804 ?
Check the PWB pattern between pin 48 (FOO) of IC802 and pins
27 and 28 of IC804. If OK. IC804 is faulty.
27 and 28 of IC804. If OK. IC804 is faulty.
Check the PWB pattern between pin 16 of CNS602 and IC804.
No
Is sawtooth wave obtained between pins 3 and 4 of BI801/
CNS801 ? (as shown above)
CNS801 ? (as shown above)
Yes
Check the PWB pattern between BI801/CNS801 and IC804.
No
BI801/CNS801 connection failure or optical pickup failure.
Yes
• Spindle motor clv servo failure.
Is above wave obtained between pins 5 and 6 of IC804 ?
Is following wave output to the pin 55 (DMO) of IC802 when
the CD TEST MODE "STEP 3" is changed to " STEP 4" ?
the CD TEST MODE "STEP 3" is changed to " STEP 4" ?
No
Yes
Check the procedure in "HF ERROR".
If OK. IC802 is faulty.
If OK. IC802 is faulty.
Check the PWB pattern between pin 55 (DMO) of IC802 and pins
5 and 6 of IC804. If OK. IC804 is faulty.
5 and 6 of IC804. If OK. IC804 is faulty.
No
Is above wave obtained between pins 5 and 6 of BI801/
CNS801 ?
CNS801 ?
Yes
Check the PWB pattern between BI801/CNS801 and IC804.
No
BI801/CNS801 connection failure or optical pickup failure.
Yes
DMO
Yes
1.5~2.5sec
1.5~2.5sec
XL-40H/50H
– 38 –
• HF error.
Yes
Yes
Is output (tracking error signal) obtained at the pins 46 (TEI)
and 47 (TEZI) of IC802 the CD TEST MODE "STEP 4" is
changed to "STEP 5"?
and 47 (TEZI) of IC802 the CD TEST MODE "STEP 4" is
changed to "STEP 5"?
Is output (HF signal) obtained at the pin 38 (RFI) of IC802
when the CD TEST MODE "STEP 4" is changed to "STEP 5"?
when the CD TEST MODE "STEP 4" is changed to "STEP 5"?
Is output (HF signal) obtained at the pins 41 (RFZI) and 42
(RFRP) of IC802 when the CD TEST MODE "STEP 4" is
changed to "STEP 5"?
(RFRP) of IC802 when the CD TEST MODE "STEP 4" is
changed to "STEP 5"?
No
No
• No sound.
No sound from both L and R-ch?
Yes
Is +4.5V applied to pin 83 (DVDD) of IC802?
No
Check the PWB pattern between pin 50 (TEO) of IC802 and pin 18
of IC804.
Check the periphery of IC804 and BI801/CNS801.
If OK. Optical pickup failure.
of IC804.
Check the periphery of IC804 and BI801/CNS801.
If OK. Optical pickup failure.
Check the periphery of IC801.
Check the PWB pattern between pin17 (RFRP) of IC801 and pins
41 (RFZI) and 42 (RFRP) of IC802.
If OK. IC801 is faulty.
Check the PWB pattern between pin17 (RFRP) of IC801 and pins
41 (RFZI) and 42 (RFRP) of IC802.
If OK. IC801 is faulty.
No
Yes
Normal.
Check the interval between the pins 82 or 85 of IC802 and the pins
1 or 3 IC601.
1 or 3 IC601.
No
Check the PWB pattern between R819 and Q861.
Yes
Is signal of pins 82 and 85 of IC802 output?
No
Check the peripheral parts of IC802. If OK, IC802 is faulty.
Yes
The main PWB is faulty.
Check the periphery of IC801.
Check the PWB pattern between
pin 12.
(TEO) of IC801 and pins 46 and 47
of IC802.
Is it normal ?
Check the PWB pattern between
pin 12.
(TEO) of IC801 and pins 46 and 47
of IC802.
Is it normal ?
Is output obtained at the pins 2 and
5 of BI802/CNS802
5 of BI802/CNS802
Optical pickup failure.
IC801 is faulty.
Check the periphery of IC801.
Check the PWB pattern between pin 19 (RFGO) of IC801 and pins
38 (RFI) of IC802.
If OK. IC801 is faulty
Check the PWB pattern between pin 19 (RFGO) of IC801 and pins
38 (RFI) of IC802.
If OK. IC801 is faulty
Is output obtained at the pins 1 and
3, 4 of BI802/CNS802.
3, 4 of BI802/CNS802.
Optical pickup failure.
Is the following wave output to the pin 55 (DMO) of IC802
when the CD TEST MODE "STEP 4" or "STEP 5"?
when the CD TEST MODE "STEP 4" or "STEP 5"?
Check the periphery pins 28~32 of IC802.
If OK. IC802 failure.
If OK. IC802 failure.
No
No
No
Yes
Yes
No
Yes
Yes
test mode "step 4"
test mode "step 5"
TEI
TEZI
test mode "step 4"
test mode "step 5"
RFI
test mode "step 4"
test mode "step 5"
RFZI
RFRP
test mode "step 4"
test mode "step 5"
DMO
– 39 –
XL-40H/50H
• Sled motor operation failure.
Yes
Yes
Is following sled feed signal output the pin 53 (FMO) of IC802
when FF/REW key is pressed after the CD TEST MODE
"STEP 1" is seted?
when FF/REW key is pressed after the CD TEST MODE
"STEP 1" is seted?
Is sled feed signal output the pins 10 and 11 of IC804?
Is sled feed voltage applied between both terminals of sled
motor?
motor?
No
Check the peripheral parts of IC804. If OK, IC804 is faulty.
No
C801 is faulty.
Check the BI803/CNS803.
No
Yes
Check the CD mechanism (periphery of sled motor).
If the sled motor does not run when DC2.0V is applied to
both terminals of sled motor, the sled motor is faulty.
If the sled motor does not run when DC2.0V is applied to
both terminals of sled motor, the sled motor is faulty.
• Sled servo failure.
Yes
Is following sled signal output the pin 53 (FMO) of IC802
during playback?
during playback?
Normal.
No
IC802 is faulty.
• Track search failure
Does the sled motor run in FF/REW state when the SERVO
TEST MODE "STEP1" is set?
TEST MODE "STEP1" is set?
Is the following wave output to the pin 49 (TRO) of IC802
during track search in normal playback?
during track search in normal playback?
Is the following wave output to the pins 12 (TEO) of IC801
during track search in normal playback?
during track search in normal playback?
Yes
Yes
No
Check as stated in item "SLED MOTOR OPERATION FAILURE".
No
IC802 failure.
No
Check the PWB pattern between pin 49 (TRO) of IC802 and pin
18 of IC804.
Check the PWB pattern between pins 20 and 21 of IC804 and
Optical pickup.
If OK. Optical pickup failure.
18 of IC804.
Check the PWB pattern between pins 20 and 21 of IC804 and
Optical pickup.
If OK. Optical pickup failure.
Yes
Is the above wave output to the pins 46 (TEI) and 47 (TEZ) of
IC802 during track serch in normal playback?
IC802 during track serch in normal playback?
No
Check the PWB pattern between pin 12 (TEO) of IC801 and pins 46
and 47 of IC802. If OK. IC801 failure.
and 47 of IC802. If OK. IC801 failure.
Normal.
Yes
Yes
Is following sled feed signal output the pins 12 and 13 of
IC804 when FF/REW key is pressed after the CD TEST
MODE "STEP 1" is seted?
IC804 when FF/REW key is pressed after the CD TEST
MODE "STEP 1" is seted?
Check the PWB pattern between pin 53 of IC802 and pins 12 and
13 of IC804.
13 of IC804.
No
Is the following wave output to the pin 41 (RFZI) and 42
(RFRP) of IC802 during track search in normal playback?
(RFRP) of IC802 during track search in normal playback?
No
Check the PWB pattern between pin 17 (RFO) and 18 (RFIS), 19
(RFRP) of IC801 and pins 41 and 42 of IC802. If OK. IC801 failure.
(RFRP) of IC801 and pins 41 and 42 of IC802. If OK. IC801 failure.
Yes
TRO
TEO
TEI
TEZI
FF
REW
FMO
FMO
RFRP
RFZI
FF
REW
SL
±
XL-40H/50H
– 40 –
FUNCTION TABLE OF IC
IC401 VHiLC75342M-1: Function/Volume Equalizer (LC75342M)
1
DI
Serial data and clock input pin for control.
2
CE
Chip enable pin. Data written into an internal latch in a timing of [H] -> [L]. Each analog switch is activated.
Data transfer enabled at [H] level.
Data transfer enabled at [H] level.
3
VSS
Ground pin.
4
TEST
Electronic volume control pin. To be set to the VSS potential.
5
LOUT
Volume + equalizer output pin.
6
LBASS2
Bass-band filter comprising capacitor and resistor connection pin.
7
LBASS1
Bass-band filter comprising capacitor and resistor connection pin.
8
LTRE
Capacitor connection pin comprising treble band filter.
9
LIN
Volume + equalizer input pin.
10
LSEL0
Input selector output pin.
11*
L4
Input signal pin.
12
L3
Input signal pin.
13
L2
Input signal pin.
14
L1
Input signal pin.
15*
NC
No CONNECT pin. To be open or connected to VSS.
16*
NC
No CONNECT pin. To be open or connected to VSS.
17
R1
Input signal pin.
18
R2
Input signal pin.
19
R3
Input signal pin.
20*
R4
Input signal pin.
21
RSEL0
Input selector output pin.
22
RIN
Volume + equalizer input pin.
23
RTRE
Capacitor connection pin comprising treble band filter.
24
RBASS1
Bass-band filter comprising capacitor and resistor connection pin.
25
RBASS2
Bass-band filter comprising capacitor and resistor connection pin.
26
ROUT
Volume + equalizer output pin.
27*
NC
No CONNECT pin. To be open or connected to VSS.
28
Vref
0.5 x VDD voltage generation block for analog ground. Capacitor of several 10
µ
F to be connected between
Vref and AWSS (VSS) as a counter measure against power ripple.
29
VDD
Supply pin.
30
CL
Serial data and clock input pin for control.
Pin No.
Port Name
Function
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
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