Sharp XL-1500 (serv.man4) Service Manual ▷ View online
XL-1500H
– 40 –
• HF error.
Yes
Yes
Is output (tracking error signal) obtained at the pins 31 (TEI)
and 32 (TEZI) of IC801 the CD TEST MODE "STEP 4" is
changed to "STEP 5"?
and 32 (TEZI) of IC801 the CD TEST MODE "STEP 4" is
changed to "STEP 5"?
Is output (HF signal) obtained at the pin 24 (RFI) of IC801
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 27 (RFZI) and 28
(RFRP) of IC801 when the CD TEST MODE "STEP 4" is
changed to "STEP 5"?
(RFRP) of IC801 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 +3.3V applied to pin 51 (DVDD) of IC801?
No
Check the PWB pattern between pin 34 (TRO) of IC801 and pin 25
of IC803.
Check the periphery of IC803 and CNP801/CNW801.
If OK. Optical pickup failure.
of IC803.
Check the periphery of IC803 and CNP801/CNW801.
If OK. Optical pickup failure.
Check the periphery of IC802.
Check the PWB pattern between pin17 (RFRP) of IC802 and pins
27 (RFZI) and 28 (RFRP) of IC801.
If OK. IC802 is faulty.
Check the PWB pattern between pin17 (RFRP) of IC802 and pins
27 (RFZI) and 28 (RFRP) of IC801.
If OK. IC802 is faulty.
No
Yes
Normal.
Check the interval between the pins 50 or 53 of IC801 and the pins
2 or 5 of IC101.
2 or 5 of IC101.
No
Check the PWB pattern between pin 51 of IC801 and Q808.
Yes
Is signal of pins 50 and 53 of IC801 output?
No
Check the peripheral parts of IC801. If OK, IC801 is faulty.
Yes
The main PWB is faulty.
Check the periphery of IC802.
Check the PWB pattern between
pin 11 (TEO) of IC802 and pins 31
and 32 of IC801.
Is it normal ?
Check the PWB pattern between
pin 11 (TEO) of IC802 and pins 31
and 32 of IC801.
Is it normal ?
Is output obtained at the pins 3 and
8 of CNP801/CNW801.
8 of CNP801/CNW801.
Optical pickup failure.
IC802 is faulty.
Check the periphery of IC802.
Check the PWB pattern between pin 19 (RFGO) of IC802 and pins
24 (RFI) of IC801.
If OK. IC802 is faulty
Check the PWB pattern between pin 19 (RFGO) of IC802 and pins
24 (RFI) of IC801.
If OK. IC802 is faulty
Is output obtained at the pins 4 and
5,6 of CNP801/CNW801.
5,6 of CNP801/CNW801.
Optical pickup failure.
Is the following wave output to the pin 41 (DMO) of IC801
when the CD TEST MODE "STEP 4" or "STEP 5"?
when the CD TEST MODE "STEP 4" or "STEP 5"?
Check the periphery pins 15~19 of IC801.
If OK. IC801 failure.
If OK. IC801 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
– 41 –
XL-1500H
• Sled motor operation failure.
Yes
Yes
Is following sled feed signal output the pin 40 (FMO) of IC801
when FF
when FF
/REW
key is pressed after the CD TEST
MODE "STEP 1" is seted?
Is sled feed signal output the pins 1 and 2 of IC803?
Is sled feed voltage applied between both terminals of sled
motor?
motor?
No
Check the peripheral parts of IC803. If OK, IC803 is faulty.
No
C801 is faulty.
Check the CNW802.
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 40 (FMO) of IC801
during playback?
during playback?
Normal.
No
IC801 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 34 (TRO) of IC801
during track search in normal playback?
during track search in normal playback?
Is the following wave output to the pins 11 (TEO) of IC802
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
IC801 failure.
No
Check the PWB pattern between pin 34 (TRO) of IC801 and pin
25 of IC803.
Check the PWB pattern between pins 26 and 27 of IC803 and
Optical pickup.
If OK. Optical pickup failure.
25 of IC803.
Check the PWB pattern between pins 26 and 27 of IC803 and
Optical pickup.
If OK. Optical pickup failure.
Yes
Is the above wave output to the pins 31 (TEI) and 32 (TEZI) of
IC801 during track serch in normal playback?
IC801 during track serch in normal playback?
No
Check the PWB pattern between pin 11 (TEO) of IC802 and pins 31
and 32 of IC801. If OK. IC802 failure.
and 32 of IC801. If OK. IC802 failure.
Normal.
Yes
Yes
Is following sled feed signal output the pins 3 and 4 of IC803
when FF
when FF
/REW
key is pressed after the CD TEST
MODE "STEP 1" is seted?
Check the PWB pattern between pin 40 of IC801 and pins 3 and 4
of IC803.
of IC803.
No
Is the following wave output to the pin 27 (RFZI) and 28
(RFRP) of IC801 during track search in normal playback?
(RFRP) of IC801 during track search in normal playback?
No
Check the PWB pattern between pins 22 (RFO),17 (RFRP), 19
(RFGO) and 20 (RFGC) of IC802 and pins 24,27,28 and 36 of IC801.
If OK. IC802 failure.
(RFGO) and 20 (RFGC) of IC802 and pins 24,27,28 and 36 of IC801.
If OK. IC802 failure.
Yes
TRO
TEO
TEI
TEZI
FF
REW
FMO
FMO
RFZI
RFRP
FF
REW
SL
±
XL-1500H
– 42 –
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.
– 43 –
XL-1500H
IC401 VHiLC75342M-1: Function/Volume Equalizer (LC75342M)
6
7
8
9
10
11
12
13
14 15 16 17
18
19
20
21
22
23
24
25
26
5
27
28
30
29
1
2
3
4
LVref
RVref
CCB
INTERFACE
CONTROL
CIRCUIT
LOGIC
CIRCUIT
CONTROL
CIRCUIT
ROUT
RBASS1
RBASS2
RTRE
RIN
RSEL0
L1
L2
L3
L4
R1
R2
R3
R4
LOUT
LBASS2
LBASS1
LTRE
LIN
LSEL0
VSS CE
DI
CL VDD
NC
Vref
NC
NC
TEST
Figure 43 BLOCK DIAGRAM OF IC
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