Category: DVD Player Repair and Service
Contents of this article
- How to access test mode
- Power supply circuit diagram
SHARP DV-620
Test Mode
A power source is put, and a playback key
and a stop key are pushed after the "NO DISC" display at the same time.
(It keeps pushing it for about three seconds.)
ROM Renewal Mode
ROM Renewal Mode
A power source is put with pushing a
playback key and a halt key at the same time. (It keeps pushing it for about
three seconds.)
FOCUS offset adjustment mode
Connect the L side of the voltmeter to the
IC702 (pin 18) and its H side to the IC702 (pin 17). Adjust the output voltage
to a range of -30mV to +10mV with the cross key "UP" or "DOWN".
With the cross joint key "<", >, 5 step change
TRACK offset adjustment mode
Connect the L side of the voltmeter to the
IC702 (pin 16) and its H side to the IC702 (pin 15). Adjust the output voltage
to a range of -30mV to +10mV with the cross key "UP" or "DOWN".
With the cross joint key "<", >, 5 step change
End of adjustment
For the section of **, the adjustment results
are displayed. The indication contents mean the "focus offset adjustment
value", "track offset adjustment value" and "spindle offset
adjustment value" from the left. Cut a power source when you finish
adjustment. When a "return"
key is pushed, it is returned in the beginning of servo adjustment mode.
IC702 BA5984FP MOTOR DRIVER
PIN CONFIGURATION AND FUNCTION
|
Pin No.
|
Terminal name
|
Operation function
|
|
1
|
FWD
|
Loading
driver FWD input terminal
|
|
2
|
OPIN1(+)
|
CH1
Former stage amplifier nonreverse input terminal
|
|
3
|
OPIN1(-)
|
CH1
Former stage amplifier reverse input terminal
|
|
4
|
OPOUT1
|
CH1
Former stage amplifier output terminal
|
|
5
|
OPIN2(+)
|
CH2
Former stage amplifier nonreverse input terminal
|
|
6
|
OPIN2(-)
|
CH2
Former stage amplifier reverse input terminal
|
|
7
|
OPOUT2
|
CH2
Former stage amplifier output terminal
|
|
8
|
VCC
|
Power
terminal
|
|
9
|
VOL(-)
|
Loading
driver Negative output
|
|
10
|
VOL(+)
|
Loading
driver Positive output
|
|
11
|
VO2(-)
|
Driver
CH2 Negative output
|
|
12
|
VO2(+)
|
Driver
CH2 Positive output
|
|
13
|
VO1(-)
|
Driver
CH1 Negative output
|
|
14
|
VO1(+)
|
Driver
CH1 Positive output
|
|
15
|
VO4(+)
|
Driver
CH4 Negative output
|
|
16
|
VO4(-)
|
Driver
CH4 Positive output
|
|
17
|
VO3(-)
|
Driver
CH3 Positive output
|
|
18
|
VO3(+)
|
Driver
CH3 Negative output
|
|
19
|
GND
|
Ground
terminal
|
|
20
|
BIAS
|
Bias
input terminal
|
|
21
|
MUTE
|
Mute
control terminal
|
|
22
|
OPOUT3
|
CH3
Former stage amplifier output terminal
|
|
23
|
OPIN3(-)
|
CH3
Former stage amplifier reverse input terminal
|
|
24
|
OPIN3(+)
|
CH3
Former stage amplifier nonreverse input terminal
|
|
25
|
OPOUT4
|
CH4
Former stage amplifier output terminal
|
|
26
|
OPIN4(-)
|
CH4
Former stage amplifier reverse input terminal
|
|
27
|
OPIN4(+)
|
CH4
Former stage amplifier nonreverse input terminal
|
|
28
|
REV
|
Loading
driver REV input terminal
|
EQUIVALENT CIRCUIT OF PICKUP
TROUBLE SHOOTING
SYMPTOM: No sound on initial playback when using "Andrew Lloyd
Webber's The Phantom of the Opera (2004)" disc.
CAUSE: The disc defaults to DTS sound, but DVD player may not be able to decode this and needs to be switched into the normal sound mode mode.
ACTION: Enter the DVD player menu and select the correct sound output.
CAUSE: The disc defaults to DTS sound, but DVD player may not be able to decode this and needs to be switched into the normal sound mode mode.
ACTION: Enter the DVD player menu and select the correct sound output.
POWER SUPPLY CIRCUIT
CLICK ON THE IMAGE TO ZOOM IN
