Sharp HT-X1H (serv.man2) Service Manual ▷ View online
HT-X1H
7 – 2
2. DVD section
• The “No Disc” indication. (In case of focus error)
When removing disc and applying load to spin motor (by stop-
ping with hand, etc.), objective lends moves up and down ?
(Checking item to symptom)
Note: If load is not applied to spin, lens does not move and
becomes NO DISC immediately.
ping with hand, etc.), objective lends moves up and down ?
(Checking item to symptom)
Note: If load is not applied to spin, lens does not move and
becomes NO DISC immediately.
No
Refer to “The “No Disc” indicator. (In case focus servo does not
function.)”.
function.)”.
ReplaceU7.
Yes
Yes
Is FE signal output to pin 40 of U7 when the disc is set ?
No
Is there input signal on the pins 13, 14, 15 and 16 ofU7 ?
Yes
No
Is FE signal inputted into the pin 142 of U9 ?
Check the connection of optical pickup cable.
If it is normal, replace the optical pickup.
If it is normal, replace the optical pickup.
Yes
Check or replace U9.
In case of CD.
For DVD, pins 9, 10, 11 and 12 of U7 ?
For DVD, pins 9, 10, 11 and 12 of U7 ?
No
Yes
Check the line between theU7 and U9.
• The “No Disc” indicator. (In case focus servo does not function.)
Is there focus control signal at output pin 172 of U9 ?
No
Check the U9DAC power source periphery circuit.
If it is normal, replace U9.
If it is normal, replace U9.
Yes
Is the focus control signal from the pin 172 of U9 input into the
pin 1 of U8 ?
pin 1 of U8 ?
No
Check the focus control signal (FOD) line between the U8 and U9.
Check M_5 V line.
Yes
No
Is the focus control drive voltage output from the pins 13 and 14
of U8 ?
of U8 ?
No
Is 5 V voltage applied to the pin 8 of U8 ?
Yes
Replace U8.
Yes
Focus control drive voltage applied to pins 1 and 2 of JB1 (focus
actuator terminal) ?
actuator terminal) ?
No
Check the line between the U9 and the focus actuator terminal.
Yes
Check the connection of optical pickup cable.
If it is normal, replace the optical pickup mechanism unit.
If it is normal, replace the optical pickup mechanism unit.
HT-X1H
7 – 3
• The CD disc is not recognised. (When the laser beam does not go on)
Is the voltage of 3.4 V being applied to the emitter of Q10 ?
No
Check the A_5 V line.
Yes
Is the voltage of 2.3 V being applied to the pin 19 of JB1 ?
No
Check the line between Q15 and CP1.
Yes
Check connection of optical pickup cable.
If it is normal, replace the optical pickup mechanism unit.
If it is normal, replace the optical pickup mechanism unit.
Place the disc on the tray and close it.
Yes
When checked, disc starts rotating?
Yes
Refer to "Disc does not turn."
No
Is the level of RF signal which is output from
pin 57 of U7, normally ?
pin 57 of U7, normally ?
Yes
Check for contamination of objective lens of optical pickup.
No
No
Replace the DVD servo PWB unit.
Replace the optical pickup mechanism unit.
No
check the DVD servo PWB unit.
Yes
Both picture and sound do not operate normally. (1)
HT-X1H
7 – 4
• Picture do not operate normally.
Set the disc on the disc tray.
Yes
Are the video signal shown above input into the pins of J3 ?
J3 pin 4 PR
J3 pin 3 PB
J3 pin 6 C
J3 pin 7 Y/G
J3 pin 3 PB
J3 pin 6 C
J3 pin 7 Y/G
No
Check the line between the pins of DVD servo unit IC10 and the
pins CP5.
pins CP5.
U9 pin 113
→ J3 1pin G/Y
U9 pin 114
→ J3 4pin PR
U9 pin 115
→ J3 13pin PB
Yes
Check or replace DSP PWB.
• Sound is not given properly from speaker.
Set disc to DISC tray and play.
Yes
Digital sound signal output at pin 124 of U9.
No
Check or replace U9.
Yes
If U1 pin21, 23 Sound signal
No
Check or replace U1.
Yes
Check or replace Amp unit.
HT-X1H
8 – 1
Audio
HT-X1H
Service Manual
HT-X1H
Market
E
CHAPTER 8.
OTHER
[1] Function table of IC
IC601 VHiLC75341/-1: Audio Processor (LC75341)
Pin No.
Terminal Name
Function
1
DI
Serial data and clock input pin for con-
trol.
trol.
2
CE
Chip enable pin.
Data written into an internal latch in a
timing of "H" to "L".
Each analog switch is activated.
Data transfer enabled at "H" level.
Data written into an internal latch in a
timing of "H" to "L".
Each analog switch is activated.
Data transfer enabled at "H" level.
3
VSS
Ground pin.
4
LOUT
Bass band filter comprising
capacitor and resistor connection pin
and bass/treble output pin.
capacitor and resistor connection pin
and bass/treble output pin.
5
LBASS
Bass band filter comprising capacitor
and resistor connection pin.
and resistor connection pin.
6
LTRE
Treble band filter comprising capacitor
and resistor connection pin.
and resistor connection pin.
7
LIN
Volume + equalizer output pin.
8
LSEL0
Input selector output pin.
9-12
L4-1
Input signal pin.
Pin No.
Terminal Name
Function
13-16
R1-4
Input signal pin.
17
RSEL0
Input selector output pin.
18
RIN
Volume + equalizer output pin
19
RTRE
Treble band filter comprising capacitor
and resistor connection pin.
and resistor connection pin.
20
RBASS
Bass band filter comprising capacitor
and resistor connection pin.
and resistor connection pin.
21
ROUT
Bass band filter comprising capacitor
and resistor connection pin and bass/
treble output pin.
and resistor connection pin and bass/
treble output pin.
22
VREF
0.5x VDD voltage generation block
for analog ground. Capacitor of sev-
eral 10µF to be connected between
VREF and AWSS (VSS) as a counter-
measure against power ripple.
for analog ground. Capacitor of sev-
eral 10µF to be connected between
VREF and AWSS (VSS) as a counter-
measure against power ripple.
23
VDD
Supply pin
24
CLK
Serial data and clock input pin for con-
trol.
trol.
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
18
17
LVref
RVref
CONTROL
CIRCUIT
CONTROL
CIRCUIT
CONTROL
CIRCUIT
LOUT
LBASS
LIN
LSEL0
L4
L3
L2
L1
R1
R2
R3
R4
RSEL0
RIN
RTRE
LTRE
RBASS
ROUT
VREF
VDD
CLK
DI
CE
VSS
CCB
INTERFACE
CD
Tuner
Tape
Video
Figure 8-1 BLOCK DIAGRAM OF IC
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