HCU-R700
– 11 –
I O P M E A S U R E M E N T M E T H O D
When measuring Laser drive current (Iop), playback the discs (CD, DVD) described below, measure Iop for CD Laser and
DVD Laser by the test point (LD1 - LD4) on the SERVO P.W.B.
TEST DISC : DVD / DVDT-S01 (Manufactured by ALMEDIO INC)
CD / TCD-784 (Manufactured by ALMEDIO INC) or commercially available Discs.
1. DVD Laser current measurement
(1) Connect the oscilloscope GND side to test point LD1 near R147 and oscilloscope signal side to
`
test point LD2 near R147.
(2) Playback the title 1 / chapter 1 of the DVD Test Disc.
(3) Measure the voltage between LD1 and LD2, calculate Iop as follows.
2. CD Laser current measurement
(1) Connect the oscilloscope GND side to test point LD3 near R148 and oscilloscope signal side to
test point LD4 near R148.
(2) Playback the track 1 of the CD Test Disc.
(3) Measure the voltage between LD3 and LD4, calculate Iop as follows.
When repairing, carry out failure diagnostics by following the procedure
described below.
If the present value of the laser drive current is 50% up to initial value, it is the point
of the pickup replacement.
In case of the pickup replacement, replace the Traverse Unit with no adjustment.
The initial value is indicated on the label on back side of Mecha.
If the present value exceeds 80mA,
replace the Traverse Unit with a new one.
Cause : Damaged electrostatically when replaced.
Iop =
Measurement Voltage Value
39 (Resistance Value)
Iop =
Measurement Voltage Value
39 (Resistance Value)
O P T I C A L P I C K U P D I A G N O S T I C S A N D R E P L A C E M E N T
LD3
LD2
LD1
R148
R147
LD4
LD2
LD1
Oscilloscope
+
–
NO DISC indicated,
Playback not smooth, etc
• Laser drive current check
• HF signal check
Present value :
50% up to initial value
Traverse Unit replacement
(refer to the next page)
Laser drive current check
after replacement. If the
present value is less than
80mA, write on the new
label by hand, put on the
new label over the old label.
Mechanism Unit bottom side
Summary of Contents for HCUR700E
Page 16: ...HCU R700 16 M E M O ...
Page 20: ...HCU R700 22 ComponentSide DSP PWB DIGITAL PWB ...
Page 21: ...HCU R700 23 Soldering Side DSP PWB DIGITAL PWB ...
Page 22: ...HCU R700 24 ComponentSide Soldering Side E VOL PWB ...
Page 23: ...HCU R700 25 ComponentSide Soldering Side VIDEO PWB ...
Page 24: ...HCU R700 26 ComponentSide FUNCTION PWB TU PWB ...
Page 25: ...HCU R700 27 Soldering Side FUNCTION PWB TU PWB ...
Page 26: ...HCU R700 28 ComponentSide SUPPLY PWB SP EXT PWB ...
Page 27: ...HCU R700 29 Soldering Side SUPPLY PWB SP EXT PWB ...
Page 28: ...HCU R700 30 ComponentSide RECT PWB AC OUTLET E PWB AC OUTLET UC PWB ...
Page 29: ...HCU R700 31 Soldering Side RECT PWB AC OUTLET E PWB AC OUTLET UC PWB ...
Page 30: ...HCU R700 32 ComponentSide POWER PWB TRANS 1 PWB TRANS 2 PWB ...
Page 31: ...HCU R700 33 Soldering Side POWER PWB TRANS 1 PWB TRANS 2 PWB ...
Page 32: ...HCU R700 34 ComponentSide Soldering Side VOL SEL PWB VOL SEL PWB ...
Page 33: ...HCU R700 35 PRINTED WIRING BOARD DVD CD VIDEO CD PLAYER HDV R100 ComponentSide MAIN PWB ...
Page 34: ...HCU R700 36 Soldering Side MAIN PWB ...
Page 35: ...HCU R700 37 SUPPLY PWB ComponentSide Soldering Side ...
Page 36: ...HCU R700 35 ComponentSide FL PWB ...
Page 37: ...HCU R700 36 Soldering Side FL PWB ...
Page 38: ...HCU R700 37 ComponentSide ...
Page 39: ...HCU R700 38 Soldering Side ...
Page 40: ...HCU R700 42 ...
Page 41: ...HCU R700 CIRCUIT DIAGRAM DSP Circuit 44 43 45 ...
Page 42: ...HCU R700 CIRCUIT DIAGRAM PO FL Circuit 47 46 48 ...
Page 43: ...HCU R700 CIRCUIT DIAGRAM TU MAIN Circuit 50 49 51 ...
Page 44: ...HCU R700 CIRCUIT DIAGRAM PO FL Circuit FL DISP TONE BLOCK 53 52 54 ...
Page 45: ...HCU R700 CIRCUIT DIAGRAM MAIN Circuit 56 55 57 ...
Page 51: ...HCU R700 CIRCUIT DIAGRAM FL SUPPLY Circuit 74 73 75 ...
Page 52: ...HCU R700 77 76 78 ...
Page 57: ...THE UPDATED PARTS LIST FOR THIS MODEL IS AVAILABLE ON ESTA ...