Hitachi HCUR700UC Service Manual page 14

HCU-R700
T R O U B L E S H O O T I N G
1 No Power (Display tube and LED do not light up)
¬
Check the Connector as follows
• Power unit ass'y :
[PG001, CN2, CN052, CN101, CN602]
• Main P.W.B. unit : [CN3B]
• Servo P.W.B. unit : [PG4/PG5/PG7/PG8]
¬
Check the voltage of Power unit ass'y
• [CN101] : (to Main P.W.B. unit) 10P EH :
6 1 3 5 7 9
+ 5 V G N D
¬
Is IC110 pin (3) [5V]? (Main P.W.B. unit, RESET signal)
¬
Check the voltage of Power unit ass'y
• [CN101] : (to Main P.W.B. unit) 10P EH :
! 1 3 5 7 9
+ 5 V G N D
¬
Check the voltage of Power unit ass'y
• [CN2] : (to Servo P.W.B. unit) 4P LC :
1 4 2 3
+ 1 2 V + 5 V G N D
• [CN101] : (to Main P.W.B. unit) 10P EH :
2 4
+ 1 2 V + 5 V
• [CN602] : (to Key/Disp unit) 3P PH :
1 2 3
– 2 6 V – 2 3 V – 2 9 V
¬
Replace "good" Main P.W.B. unit,
*
playback the ordinary discs (CD and DVD)
¬
Replace "good" DVD Mechanism, playback the ordinary
discs (CD and DVD)
Display tube does not light up (LED light up)
2
¬
Check the Connector as follows
• Power unit ass'y : [CN2, CN052, CN101, CN602]
• Main P.W.B. unit : [CN3B]
• Servo P.W.B. unit : [PG4/PG5/PG7/PG8]
¬
Check the voltage of Power unit ass'y
• [CN602] : (to Key/Disp unit) 3P PH :
1 2 3
– 2 6 V – 2 3 V – 2 9 V
¬
Please check the marked with of item 1 [No Power]
*
*
∅
NO
Insert the Connector
∅
NO
Power unit ass'y defective, replace
∅
NO
IC101 (Main P.W.B. unit) re-solder or replace
∅
NO
Check the soldering of IC101 and IC108
(Main P.W.B. unit)
∅
NO
Power unit ass'y defective, replace
∅ Main P.W.B. unit defective
OK
∅ Check the signal of IC101 pins (49) XIN, (105) CLK,
(116) PCLK2X are 27MHz
¬
Main P.W.B. unit defective
∅ Check the signal of IC101 pin (39) MCLK is 94.5kHz
¬
Main P.W.B. unit defective
∅ Check the CLOCK of IIC BUS and DATA IC101 pin
(160) AUXO (161) AUX1, when the Power on.
¬
IC101 (Main P.W.B. unit) re-solder or replace
∅
OK
DVD Mechanism defective
∅ Check the voltage of IC8 pin (30) (Servo P.W.B. unit)
RESET is +5V
¬
Check the Laser drive current and HF waveform
(Present value exceeds the initial value by 1.5 times)
¬
The Traverse unit replace
¬
Laser current registering after replacement
∅
NO
Insert the Connector
∅
NO
Power unit ass'y defective, replace
– 14 –
*
DVD Player initialization should be performed when
the µ com, peripheral parts of µ com, and Main P.W.B.
unit are replaced.
(Please see page 7 of supplement service
manual (x-0075))
∅
NO
IC101 (Main P.W.B. unit) replace, and then IC108 replace
∅
NO
IC101 and IC108 (Main P.W.B. unit) re-solder or
replace
∅ NO
IC101(Main P.W.B. unit) re-solder or replace
∅
NO
IC101, IC111 and IC701 (Main P.W.B. unit)
re-solder or replace
∅
NO
IC44 (3 pins), D1, D2, R7 (Servo P.W.B. unit) re-solder
∅
NO
Servo P.W.B. unit replace