Hitachi HCUR700UC User manual

CAUTION:
Before servicing this chassis, it is important that the service technician read the “Safety
Precautions” and “Product Safety Notices” in this service manual.
ATTENTION:
Avant d’effectuer l’entretien du châassis, le technicien doit lire les «Pr cautions de s curit »
et les «Notices de s curit du produit» pr sent s dans le pr sent manuel.
VORSICHT:
Vor Öffnen des Gehäuses hat der Service-Ingenieur die „Sicherheitshinweise“ und „Hinweise
zur Produktsicherheit“ in diesem Wartungshandbuch zu lesen.
SERVICE MANUAL
MANUEL D'ENTRETIEN
WARTUNGSHANDBUCH
Data contained within this Service
manual is subject to alteration for
improvement.
Les donn es fournies dans le pr sent
manuel d’entretien peuvent faire l’objet
de modifications en vue de perfectionner
le produit.
Die in diesem Wartungshandbuch
enthaltenen Spezifikationen können sich
zwecks Verbesserungen ändern.
OCTOBER 2000
MINI COMPONENT HI-FI SYSTEM
HCUR700UC
HCUR700E
HCUR700EBS
HCUR700W
SM0104
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
CONTENTS
SPECIFICATIONS ...............................................................................................................................................3
SERVICE POINTS..............................................................................................................................................4
WIRING DIAGRAM.............................................................................................................................................17
PRINTED CIRCUIT BOARD ..............................................................................................................................21
EXPLODED VIEW ..............................................................................................................................................83
REPLACEMENT PARTS LIST ...........................................................................................................................87
ADJUSTMENTS & MEASUREMENT ..................................................................................................................11
CIRCUIT DIAGRAM............................................................................................................................................43
BLOCK DIAGRAM ..............................................................................................................................................7

HCU-R700
– 2 –
SAFETY PRECAUTIONS
The following precautions should be observed when servicing.
1. Sincemanypartsintheunithavespecialsafety-relatedcharacteristics,alwaysusegenuineHitachi’sreplacement
parts. Especially critical parts in the power circuit block should not be replaced with other makers. Critical parts
are marked with !in the circuit diagram and printed wiring board.
2. Before returning a repaired unit to the customer, the service technician must thoroughly test the unit to ascertain
that it is completely safe to operate without danger of electrical shock.
Check that exposed parts are acceptably insulated from
the supply circuit before returning the repaired instrument
to the customer.
• Checking method
Measure the resistance value between the both poles of
attachment cup (Power supply plug) and the exposed
parts (Parts such as Knob, Cover, etc. where the cus-
tomer is easy to touch.) and check that the resistance
value is 500 kohms or more.
INSTRUMENT
(Exposed part)
Insulation tester (DC 500V)

HCU-R700
– 3 –
SPECIFICATIONS
• AV SURROUND RECEIVER SECTION (HTA-R150)
Reception frequency band : UC FM: 87.5 ~ 108.0 MHz (100 kHz step)
AM: 520 ~ 1710 kHz (10 kHz step)
E, EBS FM: 87.50 ~ 108.00 MHz (50 kHz step)
AM: 522 ~ 1611 kHz (9 kHz step)
W FM: 87.50 MHz - 108.00 MHz (50 kHz step)
AM: 522 ~ 1611 kHz (9 kHz step)
520 kHz - 1710 kHz (10 kHz step)
Rated output power : Front: 25W + 25W (6Ω/ohms, 50 Hz - 15 kHz with 0.7% T.H.D.)
: Center: 25W (6Ω/ohms, 50Hz - 15kHz with 0.7% T.H.D.)
: Rear: 25W + 25W (6Ω/ohms, 50Hz - 15kHz with 0.7% T.H.D.)
: Front: 30W + 30W (6Ω/ohms, 1 kHz with T.H.D. 10%)
: Center: 30W (6Ω/ohms, 1 kHz with T.H.D. 10%)
: Rear: 30W + 30W (6Ω/ohms, 1 kHz with T.H.D. 10%)
Audio input / output jacks : Input jacks: DVD, TV/DBS, VCR, MD/TAPE, VIDEOAUX
Output jacks: VCR, MD/TAPE
Audio digital input jacks : OPTICAL 1, OPTICAL 2
Video input / output jacks : Input jacks: DVD, TV/DBS, VCR,AUX
: Output jacks: VCR, MONITOR
Powersupply : UC : AC 120V 60Hz
E, EBS : AC 230V 50Hz
W : AC 110 ~ 127V 50/60Hz
: AC 220 ~ 240V 50/60Hz
Powerconsumption : UC : 180W (include AC OUTLET : 60W)
E, EBS : 115W
W : 115W
STANDBY : 0.8W
Maximum external dimensions : 210 (W) x 120 (H) x 324 (D) mm (including feet, controls and terminals)
Weight : 5.3 kg
Timer : Digital Quartz Clock.
Display Format: 24-hour cycle. (E, EBS, W), 12-hour cycle (UC)
Timer accuracy: Within 60 seconds at the monthly rate.
• DVD/CD/VIDEO CD PLAYER SECTION (HDV-R100)
Applicable discs : DVD discs: 12cm discs (1 layer and 2 layer)
8cm discs (1 layer and 2 layer)
Compact discs (CD-DAVideo CD): 12cm discs, 8cm discs
Audio output jacks : AUDIO OUT (Fixed output level: 2Vrms)
Digital output jacks : OPTICAL
Video output jacks : VIDEO OUT, S VIDEO OUT, COMPONENT VIDEO OUT
Video output level : VIDEO OUT: 1Vp-p (75Ω/ohms)
S VIDEO: Y; 1Vp-p (75Ω/ohms), C; 0.3Vp-p (75Ω/ohms)
COMPONENT: Y; 1Vp-p (75Ω/ohms), CB; 0.7Vp-p (75Ω/ohms)
CR; 0.7Vp-p (75Ω/ohms)
Audio frequency response : DVD: 2 Hz to 22 kHz (48 kHz sampling), 2 Hz to 44 kHz (96 kHz sampling)
CD: 2 Hz to 22 KHz (44.1 kHz sampling)
Powersupply : UC : AC 120V 60Hz
E, EBS : AC 230V 50Hz
W,WUN: AC 110 ~ 127V 50/60Hz
: AC 220 ~ 240V 50/60Hz
Powerconsumption : 14W
Maximum external dimensions : 210(W) x 96.5(H) x 309(D) mm (including feet, controls and terminals)
Weight : 2.8 kg
• REMOTE CONTROL SECTION
Remote control unit : RB-HTAR150 (for systems), RB-HDVR100 (for HDV-R100)
Remote control system : Infrared pulse
Powersupply : Two DC 1.5V R6P/AA batteries
* Specifications are subject to change for performance improvement without notice.

HCU-R700
– 4 –
1. Removal of Top Cover
(1)Remove 4 screws 1from each side.
(2)Remove 4 screws 2from the rear plate.
SERVICE POINTS
• AV SURROUND RECEIVER (HTA-R150)
2. Removal of Front Panel
(1)Remove 4 screws 5from the bottom of the front panel.
(2)Remove 2 screws 3and 2 catches from both side.
(3)Remove 2 screws 4.
(4)Remove Connector A.
(5)Remove 2 screws 6of P.W.B. bracket to remove
Connector Bto H.
B
C
D
G
H
E
F
5
4
3
3
4
Catch
Catch
Fig. 2
Fig. 4
Fig. 3
6
A
Fig. 1
1
2
1

HCU-R700
– 5 –
Fig. 6
Fig. 5
4. Removal of Power Transformer
(1)Remove the 4 screws 8.
(2)Remove Connector Ito K.
3. Removal for Rear Panel
(1)Remove 20 screws 7.
7
8
I
J
K

HCU-R700
– 6 –
5. Removal of P.W.B. Board.
(1)Remove 1 screw 9and 1 screw 10.
(2)Remove 2 screw 11.
(3)Remove 5 screws 12 from the bottom of chassis.
(4)Remove 2 pieces of P.W.B. holder afrom the bottom chassis.
12
a
Fig. 7
11
Fig. 8
9
10
Fig. 9

HCU-R700
– 7 –
6. Removal of Front P.W.B. Board.
(1)Pull the Volume knob away, and remove the nut.
(2)Pull out 2 Bass/Treble knobs and remove the nuts.
(3)Remove the Function knob.
(4)Remove 9 screws 13.
13
Fig. 11
Nut
Nut
Volume knob
Bass/Treble knob
Function knob
Fig. 10

HCU-R700
– 8 –
1. Removal of Top Cover
(1)Remove 2 screws 1from both side.
(2)Remove 4 screws 2from the rear panel.
• DVD/CD/VIDEO CD PLAYER (HDV-R100)
2. Removal of Front Panel
(1)Remove 4 screws 3from the bottom of the front panel.
(2)Remove 2 screws 4and 2 catches from both side.
(3)Remove Connector A and B.
Fig. 2
3
Fig. 3
4
4
Catch
Catch
A
B
1
1
2
Fig. 1

HCU-R700
– 9 –
4. Removal of Main P.W.B. Board
(1)Remove 4 screws 6.
(2)Remove Connector C and D.
3. Removal of Rear Panel
(1)Remove 6 screws 5.
5. Removal of Power Supply Board
(1)Remove 4 screws 7.
(2)Remove Connector E.
Fig. 4
5
Fig. 5
Main P.W.B Board
C
D
6
Fig. 6
7
E

HCU-R700
– 10 –
6. Removal of Deck Mechanism Assy
(1)Remove 4 screws 8to release the mechanism cover.
(2)Remove 4 screws 9.
7. Removal of Front P.W.B. Board
(1)Remove away the Front Metal.
(2)Pull out the Enter Button.
(3)Remove 9 screws 10.
Fig. 8
Fig. 9
Fig. 7
8
8
9
10
Enter Button
Front Metal

HCU-R700
– 11 –
IOP MEASUREMENT METHOD
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)
OPTICAL PICKUP DIAGNOSTICS AND REPLACEMENT
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

HCU-R700
–11–
CHECKING THE WAVEFORMS
To check the waveforms on the SERVO P.W.B., the GND (–) probe of the Osilloscope to “ ref”point.
NOTES
MEASURING DISC : DVD / DVDT-S01
CD / TCD-784A
(It is better to use wires for extending between the probe and test points.)
•When watching the HF waveform, use the extending wire as short as possible.
•When HF waveform is noisy or can not discriminate the eye-pattern, replace the Traverse Unit after measuring
the Iop.
•Test points 1 ~ $ are shown below.
)OUT ,TM–+TM+
9TR+ (TP)
8TR–(TP)
5FO–(TP)
&FM+ (TP)
%FM–(TP)
4FO+ (TP)
$FMO (TP)
~TMM
3FOO (TP) 7TRO (TP)
1RFI (TP)
#A3 (TP)
!DMO (TP)
"FG (TP)
(INSWN
6TEI (TP)
2FEI (TP)
VREF (TP)

HCU-R700
– 13 –
WAVEFORMS
DVD PLAY DVD PLAY DVD PLAY (INNER)
(DVD/CD) LOADING ∅ PLAY SEARCH TO OUTER CHAPTER POWER ON
(INNER ∅ OUTER) (INNER SWITCH ON)
LOADER
(OPEN ∅ CLOSE)
CD PLAY CD PLAY CD PLAY (INNER)
DVD PLAY
1 HF(RFI)
DVD PLAY
6 TEI
7 TRO
8 TR+
9 TR–
DVD PLAY(INNER)
10 DMO
11 FG
12 A3
(DVD / PLAY) LOADING PLAY
2 FEI
3 FOO
4 FO+
5 FO–
SEARCH TO OUTER CHAPTER
(INNER OUTER)
6 TEI
13 FMO
14 FM–
15 FM+
POWER ON(INNER SWITCH ON)
16 INSWN
13 FMO
14 FM–
17 OUT
LOADER(OPEN CLOSE)
TMM
18
TM+ 19
TM– 20
CD PLAY
1 HF(RFI)
CD PLAY
6 TEI
7 TRO
8 TR+
9 TR–
CD PLAY(INNER)
10 DMO
11 FG
12 A3
50mV 50nS CH1: 500mV CH2 : 100mV 1mS CH1 : 100mV CH2 : 5V 2mV
CH3 : 1V CH4 : 1V CH3 : 10V
CH1 : 500mV CH2 : 200mV CH1: 500mV CH2 : 1V 100mS CH1 : 5V CH2 : 1V 10mS
CH3 : 2V CH4 : 2V CH3 : 5V CH4 : 5V CH3 : 1V CH4 : 1V
50mV 100nS CH1 : 500mV CH2 : 100mV 1mS CH1 : 200mV CH2 : 5V 2mS
CH3 : 1V CH4 : 1V CH3 : 10V
CH1 : 500mV CH2 : 2V 1S
CH3 : 2V

HCU-R700
– 14 –
TROUBLE SHOOTING
∅
¬
¬∅
NO
NO
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+5V13579GND
Power unit ass’y defective, replace
Insert the Connector
*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))
¬
Is IC110 pin (3) [5V]? (Main P.W.B. unit, RESET signal)
IC101 (Main P.W.B. unit) re-solder or replace
¬
∅
NO
Check the voltage of Power unit ass’y
•[CN2] : (to Servo P.W.B. unit) 4P LC :
1+12V4+5V23GND
•[CN101] : (to Main P.W.B. unit) 10P EH :
2+12V4+5V
•[CN602] : (to Key/Disp unit) 3P PH :
1–26V2–23V3–29V
Power unit ass’y defective, replace
¬∅
OK
Replace “good” Main P.W.B. unit,
playback the ordinary discs (CD and DVD)
Main P.W.B. unit defective
∅ Check the signal of IC101 pins (49) XIN, (105) CLK,
(116) PCLK2X are 27MHz
∅
NO
IC101 and IC108 (Main P.W.B. unit) re-solder or
replace
¬
Main P.W.B. unit defective
∅ Check the signal of IC101 pin (39) MCLK is 94.5kHz
∅
NO
IC101(Main P.W.B. unit) re-solder or replace
¬
Main P.W.B. unit defective
∅ Check the CLOCK of IIC BUS and DATA IC101 pin
(160) AUXO (161) AUX1, when the Power on.
∅
NO
IC101, IC111 and IC701 (Main P.W.B. unit)
re-solder or replace
¬
IC101 (Main P.W.B. unit) re-solder or replace
∅
OK
Replace “good” DVD Mechanism, playback the ordinary
discs (CD and DVD)
DVD Mechanism defective
∅ Check the voltage of IC8 pin (30) (Servo P.W.B. unit)
RESET is +5V
∅
NO
IC44 (3 pins), D1, D2, R7 (Servo P.W.B. unit) re-solder
¬
Check the Laser drive current and HF waveform
(Present value exceeds the initial value by 1.5 times)
∅
NO
Servo P.W.B. unit replace
¬
The Traverse unit replace
¬
Laser current registering after replacement
∅
¬
¬∅
NO
NO
Display tube does not light up (LED light up)
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 :
1–26V2–23V3–29V
Power unit ass’y defective, replace
Insert the Connector
¬
Please check the marked *with of item 1 [No Power]
¬
*
2
*
1
∅
NO
Check the voltage of Power unit ass’y
•[CN101] : (to Main P.W.B. unit) 10P EH :
!+5V13579GND
Check the soldering of IC101 and IC108
(Main P.W.B. unit)
∅
NO
IC101 (Main P.W.B. unit) replace, and then IC108 replace
¬
∅
NO

HCU-R700
– 15 –
ADJUSTMENTS
Adjusting and Checking the Electrical Section
Measuring instruments needed for the adjustments
(1) Oscilloscope
(2) DC voltmeter
(3) Adjustment screwdriver
(4) Test disc
•TDV-540 Title2 Tr No. 1
1. Adjustment of + 5V Voltage
Adjust R502 so that the voltage of PG101 Pin6 (+5V) should be within Limit of 5.0±0.05V.
2. Adjustment of VIDEO OUT Level (Load: 75Ω).
(1) Adjust VR701 (3) Adjust VR703
Output Cord Connect to VIDEO OUT Output Cord Connect to CR
(2) Adjust VR702 (4) Adjust VR704
Output Cord Connect to VIDEO OUT Output Cord Connect to CB
*Using Disc TDV-540 Title 2 Tr No. 1
Fig. 1 Adjustment of VIDEO OUT Level (Load: 75Ω)
Video Output Terminal Adjustment Vol Specification
1. Video Out VR701 1V ± 80mVp-p
2. Video Out VR702 680 ± 40mVp-p
3. CB VR703 480 ± 20mVp-p
4. CR VR704 480 ± 20mVp-p
1V ±80mVp-p
VIDEO OUT
480 ±20mVp-p
COMPONENT OUT
680 ±40mVp-p
VIDEO OUT
480 ±20mVp-p
COMPONENT OUT

HCU-R700
– 16 –
MEMO

HCU-R700
— 18 —— 17 —
WIRING DIAGRAM
• AV SURROUND RECEIVER (HTA-R150)
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•
9:
B
•
9}
~  
  

HCU-R700
— 20 —— 19 —
WIRING DIAGRAM
• DVD/CD/VIDEO CD PLAYER (HDV-R100)
CN601
CN602
FL PWB
W101
W1A
W1B
SW PWB
PG001
W4B
W1B
PG2
PG101
PG602
SUPPLY
PWB
W1
W4
E, EBS
W, WUN
ONLY
PG601
PG3B
CN101
MAIN PWB
1
10
1
2
39
40
1 7
1
2
1
4 1
10
1
3
1
7
1
3
CN2
CN601
CN602
CN101
AP1
AC CORD
W102
DVD
MECHA
CN2 PG3A
SERVO PWB
4
1
1
40
PG4
PG5
PG6
PG7
PG8
1
1
1
5
3
6
1
1
15
24
2
39

HCU-R700
– 21 –
PRINTED WIRING BOARD
•AV SURROUND RECEIVER (HTA-R150)
Component Side Soldering Side
FL PWB

HCU-R700
–22 –
Component Side
DSP PWB
DIGITAL PWB