Thursday, January 14, 2016

SHARP DV-620 DVD VIDEO PLAYER Test Mode - Focus adjustment - track offset setting - power supply circuit - DVD player repair and service

                                                   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
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.
POWER SUPPLY CIRCUIT 
CLICK ON THE IMAGE TO ZOOM IN