Sharp DV-NC55S User manual

1
DV-NC55S/H
DV-NC60H
S01B9DV-NC55S
SERVICE MANUAL
Page
1. IMPORTANT SERVICE NOTES........................................................................................................ 2
2. FEATURES........................................................................................................................................ 3
3. SPECIFICATIONS ............................................................................................................................. 3
4. PART NAMES.................................................................................................................................... 5
5. MAINTENANCE CHECK ITEMS AND EXECUTION TIME ............................................................... 9
6. DISASSEMBLY METHOD ............................................................................................................... 10
7. OPERATION OF PICKUP ............................................................................................................... 14
8. ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS ............................ 15
9. ELECTRICAL ADJUSTMENT.......................................................................................................... 38
10. TEST MODE .................................................................................................................................... 41
11. TROUBLESHOOTING..................................................................................................................... 44
12. IC FUNCTION LIST ......................................................................................................................... 58
13. BLOCK DIAGRAMS......................................................................................................................... 82
14. SCHEMATIC DIAGRAMS................................................................................................................ 92
15. PRINTED WIRING BOARD ASSEMBLIES ................................................................................... 114
16. REPLACEMENT PARTS LIST ...................................................................................................... 137
17. PACKING OF THE SET................................................................................................................. 159
CONTENTS
In the interests of user-safety (Required by safety regula-
tions in some countries) the set should be restored to its
original condition and only parts identical to those specified
be used.
MODELS
DV-NC55S
DV-NC55H
DV-NC60H
SERVICE MANUAL VCR/DVD COMBINATION MODEL MODELS DV-NC55S/H/60H
VCR/DVD COMBINATION MODEL
SHARP CORPORATION
REW PLAY
STANDBY
CH( TRACKING )
/
POWER EJECT/ STOP
PLAY STOP
OPEN/
CLOSE VCR DVD
(AV 1 )
L(MONO)-AUDIO-RAV 2 IN VDEO
QSURROUND
DVD / CD / VIDEO CD PLAYER
VCR DVD
(LINE 3 )
PLAY STOP
OPEN/
CLOSE
C H
EJECT/
STOP
OPERATE PLAY/X2REW
L(MONO)-AUDIO-R LINE 3 IN VDEO
REC
DVD
OUT
/
DV-NC55S/H
DV-NC60H

2
DV-NC55S/H
DV-NC60H
1. IMPORTANT SERVICE NOTES
Note:
This unit can be used only where the power
supply is AC 230V-240V, 50Hz. It cannot be used
elsewhere.
CAUTION:
USE OF CONTROLS OR ADJUSTMENTS OR
PERFORMANCE OF PROCEDURES OTHER
THANTHOSE SPECIFIED HEREIN MAY RESULT
IN HAZARDOUS RADIATION EXPOSURE.
DO NOT STARE INTOTHE LASER BEAM OR
VIEWWITH OPTICAL INSTRUMENT.
WARNING:
TO REDUCETHE RISK OF FIRE OR ELECTRIC
SHOCK, DO NOT EXPOSETHIS EQUIPMENT TO
RAIN OR MOISTURE.
TO REDUCETHE RISK OF FIRE OR ELECTRIC
SHOCK, AND ANNOYING INTERFERENCE, USE
THE RECOMMENDED ACCESSORIES ONLY.
Laser Diode Properties
Material: AlGaInP
Wave length: 650 nm
Emission Duration: Continuous
Laser output: Max. 0.7 mW
(Rear of product)
•This Unit is classified as a CLASS 1 LASER
product.
•The CLASS 1 LASER PRODUCT label is located
on the rear cover.
•This product contains a low power laser device.
To ensure continued safety do not remove any
cover or attempt to gain access to the inside of
the product. Refer all servicing to qualified
personnel.
Power Lead Protection
To avoid any malfunctions of the unit, and to protect
against electric shock, fire or personal injury, please
observe the following.
•Hold the plug firmly when connecting or
disconnecting the AC power lead.
•Keep the AC power lead away from heating
appliances.
•Never put any heavy object on the AC power lead.
•Do not attempt to repair or reconstruct the AC
power lead in any way.
CLASS 1
LASER PRODUCT
VARO! AVATTAESSA OLET ALTTIINA LASERSÄTEILYLLE.
ÄLÄ TUIJOTA SÄTEESEEN ÄLÄKÄ KATSO SITÄ OPTISEN LAITTEEN LÄPI.
VARNING - LASERSTRÅLNING NÄR DENNA DEL ÄR ÖPPNAD.
STIRRA EJ IN STRÅLEN OCH BETRAKTA EJ STRÅLEN GENOM OPTISKT
INSTRUMENT.

3
DV-NC55S/H
DV-NC60H
2. FEATURES
ËË
ËË
ËCommon Features
• A DVD, AUDIO CD player and VCR all in one.
• Simultaneous VCR recording and DVD playback.
ËË
ËË
ËVCR
• Hi-Fi Stereo Sound/Double-Azimuth 4-Heads
• 1 minute Rewind (E-180)
• S-VHS Simple Playback
• HQ (High Quality) Circuitry
• Simple Recording Timer
• Sharp Super Picture
ËË
ËË
ËDVD
• Plays DVD and Audio CD discs as well as CD-R/CD-RW discs recorded in MP3 file format
• Virtual Dolby Surround (QSURROUND*1) provides high-quality surround sound
• Digital Gamma correction and Digital Super Picture functions
• Dolby Digital*2, DTS*3, MPEG Audio digital out capability
• High-quality digital images
• High-quality digital sound
*1QSURROUNDTM is a trademark of QSound Labs, Inc.
*2Manufactured under license from Dolby Laboratories. "Dolby", "Pro Logic" and the double-D symbol are trademarks of
Dolby Laboratories.
*3"DTS" and "DTS Digital Surround" are trademarks of Digital Theater Systems, Inc.
3. SPECIFICATIONS
Signal System: PAL
INPUT/OUTPUT JACKS
DVD/VCR shared output jacks: VIDEO jack: RCA Pin-jack
AUDIO jack: RCA Pin-jack
DVD output jacks: VIDEO jack: S-Video jack
AUDIO jack: RCA Pin-jack
DIGITAL AUDIO IF: Coaxial digital
AUDIO output jack: RCA Pin-jack
VIDEO input jacks: VIDEO jack: SCART
AUDIO jack: SCART
VCR
Video Recording System: Rotary Two-Head Helical Scanning
Number of Video Heads: 4
Video Signal Standard: NTSC Colour System
Audio Recording System: 1 Stationary Head for Linear Audio
2 Rotary Heads for Hi-Fi stereo
Tape Width: 12.7 mm
Tape Speed (PAL): (SP) 23.39 mm/sec
(LP) 11.70 mm/sec
(EP) 7.80 mm/sec
(NTSC) (SP) 33.35 mm/sec (Playback only)
(LP) 16.67 mm/sec (Playback only)
(EP) 11.12 mm/sec (Playback only)

4
DV-NC55S/H
DV-NC60H Recording/Playback Time: (SP) 240 min (With E-240 Cassette)
(LP) 480 min (With E-240 Cassette)
(EP) 720 min (With E-240 Cassette)
Channel Coverage: UHF E21-E69
Antenna Input: 75Ω
Video Input: Input level: 0.5 to 2.0 Vp-p (75Ω)
Video Output: Output level: 1.0 Vp-p (75Ω)
Audio Output: Output level: –3.8 dBs (47kΩ)
(0 dBs = 0.775 Vrms)
Audio Output: Output level: –8 dBs (1kΩ)
(0 dBs = 0.775 Vrms)
Hi-Fi Audio: Dynamic Range: 90 dB
Frequency Response: 20 Hz-20 kHz
Memory Backup: 60 seconds (55H/60H)
60 minutes (60S)
DVD
DVD/VCR shared Video output: Output level: 1 Vp-p (75Ω)
S video output: Y output level: 1 Vp-p (75Ω)
C output level: 0.286 Vp-p (75Ω)
Audio output: Output level: 2 Vrms (1 kHz, 0 dB)
Video signal horizontal resolution: 500 lines
S/N ratio: 60 dB
Audio signal frequency characteristics: For DVD linear PCM playback:
4 Hz to 22 kHz (48 kHz sampling)
4 Hz to 44 kHz (96 kHz sampling)
CD playback: 4 Hz to 20 kHz (JEITA)
S/N ratio: CD: 100 dB, 1 kHz (EIAJ)
Dynamic range: DVD linear PCM: 96 dB (JEITA)
CD: 96 dB (JEITA)
Total harmonic distortion ratio: CD: 0.006% (JEITA)
Pickup: Wave length: 650 nm (DVD) / 780 nm (CD)
Laser output: Max. 0.7 mW
Operating temperature: 5°C to 35°C (41°F to 95°F)
Storage temperature: –20°C to 55°C (–4°F to 131°F)
Power supply: 230V-240V AC, 50 Hz
Power consumption: 29 W
Dimensions: 430 mm × 99 mm × 363 mm (W × H × D)
Weight: 6.3 kg
Specifications are subject to change without notice.
Weight and dimensions are approximate.
3-1. ACCESSORIES
Accessories: Remote Control Unit x 1, Battery x 2, 21Pin Cable x 1, RF Cable x 1,
Operation Manual x 1, Quick Start Guide x 1

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DV-NC55S/H
DV-NC60H
5. MAINTENANCE CHECK ITEMS AND EXECUTIONTIME
Parts Maintained 1,000 hrs. 2,000 hrs.
Pickup
Spindle Unit
Sled Motor
Loading Motor
Belt
Note : Part Replacement
: Cleaning
(For cleaning, use a lint-free cloth danpened with pure isopropyl alcohol.)
Use the following table as a guide to maintain the mechanical parts in good operating condition.
CARES WHEN USING THE PICKUP
1. The laser light having wavelength 650 nm is emitted from the objective lens. BE CAREFUL SO THAT THE LASER
LIGHT DOES NOT ENTER DIRECTLY INTO YOUR EYE.
2. The semiconductor laser may be easily damaged by electrostatic charges. When handling the pickup, take care so that
the electrostatic charge is not generated.
3. The semiconductor laser may be easily damaged by overcurrent. Use the power supply unit which does not give any
spike current when the power is turned on and off.
4. Carefully remove the dust and dirt from the objective lens with the lens blower.
When handling the objective lens, take due care so that it is not contaminated with fingerprint, etc. If the objective lens
is contaminated, impregnate the cleaning paper with a small quantity of solvent (isopropyl alcohol), and gently wipe to
clean.
5. The ozone layer depleting components (ODC) are not used in the production process for the product.
MECHANICAL PARTS REGUIRING PERIODICAL INSPECTION

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DV-NC55S/H
DV-NC60H
6. DISASSEMBLY METHOD
6-1. DISASSEMBLY METHOD
1)Removing the cabinet.
(1) Remove the seven screws 1and 2.
2)Removing the rear panel.
(1) Remove the ten screws 3.
(2) Remove the three screws 4.
3)Removing the front panel.
(1) Remove the three screws 5.
(2) Remove the three hooks 6.
4)Removing the front PWB.
(1) Remove the four FFCs 7and 8.
(2) Release the two hooks 9and tilt the PWB
toward you to remove it.
(3) Release the two hooks 0and tilt the PWB
toward you to remove it.
5)Removing the DVD mechanism.
(1) Remove the four screws q.
(2) Remove the two screws w.
(3) Remove the DVD REINF. angle e.
(4) Remove the three connectors r.
(5) Remove the two FFCs t.
2
1
1
3
4
Ｈ
Ｈ
8
7
5
6
8
9
10
DV-NC55S/H
DV-NC60H
Shild Plate
7
5
6Ｈ
11
13
15 14
14
15
11 12
11
(6) Remove the FFC y.
(7) Remove the shield (lower) u.
(8) Remove the FFC i, and at connector o, and
at four screws p.
(9) Remove the wire from the wire holder a.
(10)Remove the DVD main PWB s.
(11)Remove the FFC cover d.
(12)Remove the two interface PWB holders f, and
remove the interface PWB g.
(13)Remove the two screws h.
26
24
23
22
19
17
16
20
18
21
25

11
DV-NC55S/H
DV-NC60H
(14)Remove the connectors j.
(15)Remove the five screws k and l.
6)Removing the cassette housing control/VCR mechanism.
(1) Remove the two screws ;.
(2) Remove the two screws .
(3) Remove the one screw .
7)Removing the terminal plate.
(1) Remove the four screws .
31
28
29
27
33
30
31
32
34
35
32
33
34
8)Removing the VCR main PWB.
(1) Remove the one screw .
9)Removing the bottom plate.
(1) Remove the six screws .
35

12
DV-NC55S/H
DV-NC60H
6-2. EXTENSION CABLE USE POINT (FOUR PLACES)
Extension Cable Diagram
Parts Code Price Code Name/Description
QCNW-8600AJZZ AD Extension cable (FFC), 29pin
DVD main CN801–INTERFACE CN8202
QCNW-8601AJZZ AE Extension cable (FFC), 23pin
INTERFACE CN8203–DVD display CN5001
QCNW-8605AJZZ AE Extension cable (FFC), 9pin
DVD main CN802–AV SC2003
QCNW-8607AJZZ AG Extension cable(wire), 9pin
DVD main CN201– POWER P9001
QCNW-8609AJZZ AF Extension cable(wire), 11pin
INTERFACE CN8201– POWER P9002
QCNW-A224WJZZ AE Extension cable(shield wire), 2pin
DVD main CN803– AV SC2004
QCNW-A225WJZZ AD Extension cable(shield wire), 2pin
VCR main P1201– INTERFACE CN6101
QCNW-A227WJZZ AC Extension cable(FFC), 9pin
INTERFACE CN6102– AV CN2005
QCNW-A256WJZZ AH Extension cable(wire), 12pin
VCR main P9601– POWER P9003
QCNW-A226WJZZ AB Extension cable(FFC), 19pin
AV SC2001– TERMINAL SC2505
AV SC2002– TERMINAL SC2504
Tuner Terminal PWB QCNW-A226WJZZ
19PIN QCNW-A256WJZZ
12PIN
Power PWB
P9003
P9002
P9001
CN6102
CN6101
CN8201
CN8203
CN8202
SC2504
P9601SC2004
SC2003
SC2505
SC2001
CN2005
SC2002
P1201
QCNW-A225WJZZ
2PIN
QCNW-A227WJZZ
9PIN
QCNW-8609AJZZ
11PIN
Interface
PWB
DVD Display PWBVCR Display PWB
VCR Mechanism
VCR Main PWB
AV PWB
QCNW-8601AJZZ
23PIN
QCNW-8600AJZZ
29PIN
QCNW-8605AJZZ
9PIN
QCNW-A224WJZZ
2PIN
QCNW-8607AJZZ
9PIN
CN802
CN803
CN201
CN801
DVD Main PWB
DVD Mechanism
CN5001

13
DV-NC55S/H
DV-NC60H
<Replacing the pickup and the spindle motor>
Since the pickup optical axis and turntable inclination of DVD are adjusted with higher accuracy than of CD/MD, make a replacement
as a mechanism service chassis ass'y (refer to Parts List).
Front Side
Sled Motor Lead Wire
Pickup FFC
Traverse Fixing Screw
Loading Motor Lead Wire
Pickup interface PWB
Pickup FFC
Short Land
6-3. REPLACEMENT OF MAIN PARTS
<Take out disk>
1. Remove the mechanism with angle from the set (refer to 35 on page 156).
2. It is in such cases as the thin driver, and it is pushed in slowly, and a tray is drawn in the arrow direction the slide rack on the
left of the base chassis.
3. Take out disk.
<Disassembling and assembling the mechanism chassis>
1. After setting the mechanism chassis to the angle state, ground it to prevent the electrostatic discharge damage of the pickup.
2. Remove S and the DVD shield (lower) 56 (refer to the illustration on page 156).
3. Remove P , Q , Z and R 83 from the DVD main PWB unit 68 , and loosen the 4 screws 45 to remove the DVD main PWB
unit 68 . (Pickup relay FFC 74 isn't removed.) (refer to the illustration on page 156)
4. Remove screws fixing the base chassis (located at the back right and at front left when facing the set).
5. With the pickup FFC connected, turn over the base chassis and short (solder) two short lands on the pickup interface PWB in
order to prevent the electrostatic discharge damage of the pickup.
6. Remove the pickup FFC from the main PWB.
7. Remove the pickup FFC from the pickup interface PWB.
8. Remove the traverse mounting screws to remove the traverse chassis ass'y.
Note: After assembly and wiring, remove the solder joint of the short land. If short-circuited, a disk is not played back.

14
DV-NC55S/H
DV-NC60H
7. OPERATION OF PICKUP
7-1. CIRCUIT CONFIGURATION OF PICKUP
The pickup unit reads signals from the disk, and the flexible cable is connected to the board. The following signals flow through the
cable.
7-2. EQUIVALENT CIRCUIT OF PICKUP 7-3. POLARITIES OF SIGNAL
Focus When electric current is flowed
FO+, FO- from FO+ to FO-, the lens comes
to near the disk.
Tracking When electric current is flowed
TR+, TR- from TR+ to TR-, the lens goes
toward the outer circumference.
FO+
TR–
TR+
FO–
ACTUATOR
OSC VOS
–
+
–
+
–
+
–
+
HOLOGRAM LASER UNIT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20 1
TR–
FO+
TR+
FO–
VR
PD
VCC
GND
LD
GND
VOS
NC
NC
Vref(VCC/2)
VA
VD
NC
GND
VB
VC
(NC)
Power adjust
HIGH-FREQUENCY CONVOLUTION
LD
PD
VA
VB
VC
VD
Vref
Vcc
GND
7-4. SIGNALS OF PICKUP
7-4-1. Tracking drive signal (TR+, TR-)
The signal drives the tracking servo mechanism which projects the beam on the track by moving the objective lens (OL) to the outer
or inner circumference (at a right angle against the track) of the disk.
7-4-2. Focus drive signal (FO+, FO-)
The signal drives the focus servo mechanism which aligns the focus on the pit of the disk
by elevating OL (vertically against the disk surface.)
The VR terminal is connected to GND.
2-focus objective lens
Actuator assembly
7-4-3. Monitor Diode (PD)
Since the laser diode largely varies output of the laser light even if the flowing current is slightly varied, the projection
light is detected with the monitor diode to control the laser light to be equally output.
Since the current varies on the monitor diode according to the intensity of the received light of the laser diode, the drive current of
the laser diode is reduced if the current of the monitor diode increases. On the contrary, the drive current of the laser diodeis increased
if the current of the monitor diode decreases.
As the projection light of the laser diode becomes stronger, the current of the monitor diode increases to increase the current which
flows into the monitor diode output (PD). This is input to the pin 44 of IC301 and is compared with the reference voltage to control
the drive current of the laser diode.
The circuit is called ALPC (Automatic Laser Power Control).
7-4-4. Laser diode drive current control (LD)
Power supply to drive the laser diode
7-4-5. High-frequency convolution module power supply (VOSC)
The high-frequency convolution imposes the high-frequency signal on the DC current to impose the high frequency on the drive
current of the laser. Thus, the interference of outgoing light and reflected light is prevented.
LD PD
7-4-6. HF Signal (VA, VB, VC, VD)
Signals recorded in the disk
When the quantity of laser light increases, the
current shown in figure increases and the PD
terminal voltage rises.
IC301 is used to control. The LD terminal voltage
lowers, and the quantity of light reduces. (IC301 is
actuated by voltage input.)

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DV-NC55S/H
DV-NC60H
12. JiGRVGH-F18 BU
11. JiGDRiVER-6 BM
10. JiGDRiVERH-4 AP
4. Torque Driver JiGTD1200 CB
8. ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS
The explanation given below relates to the on-site general service (field service) but it does not relates to the adjustment
and replacement which need high-grade equipment, jigs and skill. For example, the drum assembling, replacement and
adjustment service must be performed by the person who have finished the technical courses.
8-1. MECHANISM CONFIRMATION ADJUSTMENT JIG
So as to perform completely the mechanism adjustment prepare the following special jigs. So as to maintain the initial
performance of the machine the maintenance and check are necessary. Utmost care must be taken so that the tape is
not damaged. If adjustment needs any jig, be sure to use the required jig.
JiGTG1200 CN
JiGMP0001 BY
1. Torque Cassette Meter JiGVHT-063 CZ
No. Jig ltem Part No. Code Configuration Remarks
JiGTG0090 CM
3. Torque Gauge Head JiGTH0006 AW
JiGRH0002 BR
JiGSG2000 BS
JiGSG0300 BF
7. JiGADP0003 BK
Tension Gauge
These Jigs are used for checking
and adjusting the reel disk height.
When fixing any part to the threaded
hole using resin with screw, use the
jig. (Specified torque 5 kg)
This cassette torque meter is used for check-
ing and adjusting the torque of take-up for
measuring tape back tension.
These Jigs are used for checking
and adjusting the torque of take-up
and supply reel disks.
Master Plane Jig and
Reel Disk Height
Adjusting Jig
Pinch pressing force
measuring jig
This Jig is used with the tension
gauge.Rotarytransformerclearance
adjusting jig.
There are two gauges used for the
tension measurements, 300 g and
2.0 kg.
8. JiGDRiVER11055 AR
Reverse guide height
adjustment box driver This Jig is used for height adjustment of the
reverse guide (for reverse guide height ad-
justment).
VROUBZFS CK
VROCPSV
This screwdriver is used for adjusting the
guide roller height.
For X value adjustment
This Jig is used for height
adjustment of the reverse guide.
X value adjustment
gear driver
Reverse Guide Height
Adjusting Jig
2. Torque Gauge
6.
5.
9. Alignment Tape
Guide roller height
adjustment driver
Video Audio Track
625 Monoscope 6kHz 35µm
625 Monoscope 6kHz
and and 49µm
Colour bar 1kHz

16
DV-NC55S/H
DV-NC60H
8-2. MAINTENANCE CHECK ITEMS AND EXECUTION TIME
Perform the maintenance with the regular intervals as follows so as to maintain the quality of machine.
NOTE : Part replacement. : Cleaning : Apply grease
<Specified> Cleaning liquid Industrial ethyl alcohol
* This mechanism does not need electric adjustment with variable resistor. Check parts. If any deviation is found,
clean or replace parts.
Maintained
Parts Remarks
500
hrs. 1000 hrs. 1500 hrs. 2000 hrs. Possible symptom
encountered
Guide roller ass’y
Sup guide shaft
Reverse guide
Slant pole on pole base
Full erase head
A/C head
Upper and lower drum ass’y
Capstan D.D. motor
Pinch roller
Reel belt
Tension band ass’y
Loading motor
Idler ass’y
Limiter pulley
Supply/take-up main brake levers
Color and beating
Small sound or sound
distortion
Poor S/N ratio, no color
Poor flatness of the
envelope with alignment
tape
No tape running,
uneven color
No tape running, tape
slack
No tape running, tape
slack, no fast forward/
rewind motion
Lateral noises Head
occasionally blocked
Abnormal rotation or significant
vibration requires replacement.
Clean tape contact part with the
specified cleaning liquid.
Clean tape contact area with the
specified cleaning liquid.
Clean rubber and rubber contact
area with the specified cleaning
liquid.
Replace the roller of the cleaner
when it wears down.
Just change the AHC roller
assembly for new one.
Screen swaying
Cassette not loaded or
unloaded
No tape running, tape
slack
Tape slack
AHC (Automatic head cleaner)
Video head cleaning procedure
1. Apply one drop of cleaning liquid to the cleaning paper with the baby oiler.
2. Gently press the cleaning paper against the video head to fix your finger, and move the upper drum so that each head
is passed to and fro 5 times (do not move the cleaning paper).
3. Wipe with the dry cleaning paper.
Notes :
• Use the commercially available ethanol of Class 1 as
cleaning liquid.
• Since the video head may be damaged, do not move up
and down the cleaning paper.
• Whenever the video head is cleaned, replace the clean-
ing paper.
• Do not apply this procedure for the parts other than the
video head.
Parts Code Description Code
ZPAPRA56-001E Cleaning Paper AW
ZOiLR-02-24TE Babe Oiler (Spoit) AH
Gently press the cleaning paper to
fix with your finger, and rotate the
upper drum to clean.
Move to and fro 5 times for each head.
(Do not move the cleaning paper.)
Rotate the upper drum
with one hand.

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DV-NC55S/H
DV-NC60H
8-3. FUNCTION OF MAJOR MECHANICAL PARTS (TOP VIEW)
No. Function No. Function
1 Full erase head
2 Supply pole base ass’y
3 Tension arm ass’y
4 Idler wheel ass’y
5 Pinch drive lever ass’y
6 Supply reel disk
7 Supply main brake ass’y
8 Take-up main brake ass’y
9 Pinch drive cam
10 A/C Head ass’y
11 Reverse guide lever ass’y
12 Casecon drive gear
13 Take-up reel disk
14 Pinch roller lever ass’y
15 Drum ass’y
16 Loading motor
17 Drum motor
18 Take-up pole base ass’y
1715 10
11
5
9
14
12
8
16
13
4
6
2
7
3
1
18

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DV-NC55S/H
DV-NC60H
FUNCTION OF MAJOR MECHANICAL PARTS (BOTTOM VIEW)
No. Function No. Function
19 Slow brake
20 Master cam
21 Capstan D.D. motor
22 Reel belt
23 Clutch lever
24 Limiter pulley ass'y
12 Casecon drive gear
26 Shifter
26
24
21
22
19
20
12
23

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DV-NC55S/H
DV-NC60H
3
1
2
AUDIO/VIDEO PWB
MAIN PWB
CASSETTE
HOUSING
Tuner
MECHANISM
CHASSIS
8-4. DISASSEMBLING THE MECHANISM/MAIN PWB ASSEMBLY
1. When removing the mechanism from the main PWB.
Remove the PWB bottom plate 1 screw 1.
Remove the FFC cable (AA, AD, AH) 2which connect-
ing the PWB and the mechanism.
Take out vertically the mechanism so that it does not
damage the adjacent parts.
2. Removing the mechanism and cassette housing.
Remove 2 screws 3fixing the cassette housing to the
mechanism, and remove the cassette housing.

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DV-NC55S/H
DV-NC60H
8-5. CARES WHEN REASSEMBLING
INSTALLING THE CASSETTE HOUSING
When the cassette housing is installed on the mechanism,
the initial setting is essential condition.
There are two initial setting methods, namely electrical and
mechanical.
1. Electrical initial setting
So as to perform initial setting of mechanism execute the
Step 1 of Installation of cassette housing. After ascertaining
the return to the initial setting position (*1) install the
cassette housing. (Conditions: When mechanism and PWB
have been installed)
2. Mechanical initial setting
Feed the pulley feed gear of loading motor with screw
driver. After ascertaining the return to the initial set position
(*1) install the cassette housing in the specified position.
(This method is applied only for the mechanism.)
INSTALLING THE MECHANISM ON PWB
Lower vertically the mechanism, paying attention to the
mechanism edge, and install the mechanism with due care
so that the parts are not damaged. So as to fix the mecha-
nism to the main PWB install 1 screw 1. For other, fix the
vicinity of loading motor and solder joint side of main PWB.)
Connect again the FFC cable (AA-MH, AD-ME, AH-MH)
between the mechanism and the main PWB.
PARTS WHICH NEED PARTICULAR CARE
When installing the mechanism chassis on the PWB unit,
take care so as to prevent deformation due to contact of
mechanism chassis with REC TIP SW.
Pulley feed gear
Screwdriver
Casecon
drive gear
Drive angle of
cassette housing
Tilt mark (*1)
1
AUDIO/VIDEO PWB
MAIN PWB
START SENSOR
END SENSOR
REC TIP SW
TUNER

21
DV-NC55S/H
DV-NC60H
Figure 8-1.
• Reassembly
1. Before installing the cassette housing control, short-
circuit between TP5102 and TP5103 provided goes left
atVCR display PWB, press theejectbutton.Thecasecon
drive gear turns and stops when the positioning mark
appears. Engage two teeth of casecon drive gear with
the three teeth of casecon drive angle gear, and set on
the mechanism chassis as shown below.
Figure 8-2.
2. Install in the reverse order of removal.
Power source plug is pulled out after the mounted
completion, and it comes.
Notes:
1. When fitting the S/E sensor holder to the cassette
controller frame L/R, take care.
2. Misengagement of teeth of casecon drive gear and drive
angle gear causes malfunction. (The cassette cannot be
set, load and ejection are repeated).
3. In the case when you use the magnet screw driver, never
approach the magnet driver to the A/C head, FE head,
and drum.
4. When installing or removing, take care so that the
cassette housing control and tool do not contact the
guide pin or drum.
5. After installing the cassette housing control once per-
form cassette loading operation.
8-7. TORUNATAPEWITHOUTTHECASSETTE
HOUSING CONTROL ASSEMBLY
1. Remove the full-surface panel.
2. Short-circuit between TP5102 and TP5103.
3. Plug in the power cord.
4. Turn off the power switch.
(The pole bases move into U.L.position.)
5. Open the lid of a cassette tape by hand.
6. Hold the lid with two pieces of vinyl tape.
7. Set the cassette tape in the mechanism chassis.
8. Stabilize the cassette tape with a weight (500g) to
prevent floating.
9. Turn on the power switch.
10. Perform running test.
8-6.REMOVING AND INSTALLING THE CAS-
SETTE HOUSING
• Removal
1. In the cassette removing mode, remove the cassette.
2. Unplug the power cord.
3. Remove in the following numerical order.
a) Remove two screws 1.
b) Slide and pull up the cassette housing control.
1
Casecon
drive gear Casecon drive
angle gear
500g
Figure 8-3.
Mechanism chassis
Weightto prevent
float (500g)
Note:
The weight should not be more than 500g.
To take out the cassette tape.
1. Turn off the power switch.
2. Take out the cassette tape.
Cassette
housing
control

22
DV-NC55S/H
DV-NC60H
8-8.REEL DISK REPLACEMENT AND HEIGHT
CHECK
• Removal
1. Remove the cassette housing control assembly.
2. Pull the tension band out of the tension arm ass'y.
3. Remove the Supply/Take-up main brake ass'y.
4. Open the hook at the top of the reel disk, and remove the
reel disk.
Note:
Take care so that the tension band ass'y and main brake
ass'y (especially soft brake) are not deformed.
Notes:
1. When installing the reel disk, take due care so that the
tension band ass'y is not deformed and grease does no
adhere.
2. Do not damage the Supply main brake ass'y. Be careful
so that grease does not adhere to the brake surface.
• Reassembly (Take-up reel disk)
1. Clean the reel disk shaft and apply grease (SC-141) to
it.
2. Align the phase of the reel disk to that of the reel relay
gear and to install a new take-up reel disk onto the shaft.
3. Check the reel disk height and reassemble the take-up
main brake ass'y.
Note:
1. Take care so that the Take-up main brake ass'y is not
damaged. Take care so that grease does not adhere the
brake surface.
2. After reassembly, check the video search rewind back
tension (see 8-13), and check the brake torque (see 8-
17).
• Height checking and adjustment
Note:
1. Set the master plane with due care so that it does not
contact the drum.
2. When putting the master plane, shift the reverse guide
a little in the loading direction. Care must be taken since
excessive shift results in damage.
Figure 8-6.
Note:
1. Check that the reel disk is lower than part A but higher
than part B. If the height is not correct, readjust the reel
disk height by changing the poly-slider washer under the
reel disk.
Figure 8-4.
Note:
When the tension band ass'y is pressed in the direction of
the arrow for removal, the catch is hard to be deformed.
Figure 8-5.
• Reassembly (Supply reel disk)
1. Clean the reel disk shaft and apply grease (SC-141) to
it.
2. Match the phases of reel disk and reel relay gear, and set
the new reel disk.
3. After checking the reel disk height, wind the tension
band ass'y around the reel disk, and insert into the hole
of tension arm ass'y.
4. Assemble the Supply main brake ass'y.
Tension arm ass'y
Supply reel disk Take-up reel disk
Master plane
Reverse
guide
Position
pin
Take-up main brake ass'y
Supply reel disk
Cassette lock
release shaft
Take-up reel disk
Tension band ass'y
Supply main brake ass'y

23
DV-NC55S/H
DV-NC60H
2. Whenever replacing the reel disk, perform the height
checking and adjustment. Notes:
1. Hold the torque gauge by hand so that it is not moved.
2. Do not keep the reel disk in lock state. Do not allow long-
time measurement.
8-10.CHECKINGANDADJUSTMENTOFTAKE-
UP TORQUE IN REWIND MODE
• Remove the cassette housing control assembly.
• After short-circuiting between TP5102 and TP5103
provided goes left at VCR display PWB, plug in the
power cord.
• Setting
1. Set a torque gauge to zero on the scale. Place it on the
supply reel disk.
2. Press the rewind button.
3. To calculate the remaining capacity, slowly rotate the
take-up reel disk, and then shift it into the rewind mode.
• Checking
1. Turn the torque gauge slowly (one rotation every 2 to 3
seconds) by hand in the CCW direction.
2. Make sure that the indication of torque gauge is not less
than 30mN·m (306gf·cm).
AB
Figure 8-7.
Master plane Reel disk height
adjusting jig
Mechanism chassis
Reel disk
10 ±0.2mm Reel disk
8-9.CHECKING AND ADJUSTMENT OF TAKE-
UP TORQUE IN FAST FORWARD MODE
• Remove the cassette housing control assembly.
• After short-circuiting between TP5102 and TP5103
provided goes left at VCR display PWB, plug in the
power cord.
• Setting
1. Set a torque gauge to zero on the scale. Place it on the
take-up reel disk.
2. Press the FF button.
3. To calculate the remaining capacity of the play back
mode, slowly rotate the supply reel disk, and then shift
it into the forward mode.
• Checking
1. Turn the torque gauge slowly (one rotation every 2 to 3
seconds) by hand in the CW direction.
2. Make sure that the indication of torque gauge is not less
than 30mN·m (306gf·cm).
Figure 8-9.
Torque gauge
30mN·m (306gf·cm)
or more
Supply reel disk
Idler ass'y
The gauge is held at
its maximum value.
(Red mark)
• Adjustment
1. If the rewind winding-up torque is less than the specified
value, clean the capstan D.D. motor pulley, drive belt,
and limiter pulley with cleaning liquid, rewind again, and
check the winding-up torque.
2. If the winding-up torque is still out of range, replace the
drive belt.
Figure 8-8.
Torque gauge
30mN·m (306gf·cm)
or more
The gauge is held at
its maximum value.
(Red mark)
Idler ass'y
• Adjustment
1. If the FF winding-up torque is less than the specified
value, clean the capstan D.D. motor pulley, drive belt,
and limiter pulley with cleaning liquid, and check again.
2. If the torque is less than the set value, replace the reel
belt.
CCW
CW

24
DV-NC55S/H
DV-NC60H
Notes:
1. Hold the torque gauge by hand so that it is not moved.
2. Do not keep the reel disk in lock state. Do not allow long-
time measurement.
8-11.CHECKING AND ADJUSTMENT OF
TAKE-UP TORQUE IN RECORD/
PLAYBACK MODE
• Remove the cassette housing control assembly.
• After short-circuiting between TP5102 and TP5103
provided goes left at VCR display PWB, plug in the
power cord.
• Turn off the power switch.
• Open the cassette torque meter lid, and fix it with
tape.
• Load the cassette torque meter into the unit.
• Put the weight (500g) on the cassette torque meter.
• Turn on the power switch.
• Press the picture record button, and set EP picture
record mode (x3).
8-12.CHECKINGANDADJUSTMENTOFTAKE-
UP TORQUE IN VIDEO SEARCH REWIND
MODE
• Remove the cassette housing control assembly.
• After short-circuiting between TP5102 and TP5103
provided goes left at VCR display PWB, plug in the
power cord.
• Setting
Press the playback button and rewind button to set the
video search rewinding mode.
• Checking
Place the torque gauge on the supply reel disk, and turn it
counterclockwise very slowly (one rotation every 1 to 2
seconds) and check that the torque is within the set value
14.0 ±3.9mN⋅m. (144 ±40gf⋅cm)
Set value EP6.9 ±2.5mN⋅m (70 ±25gf⋅cm)
500g
Cassette torque meter
Figure 8-10.
• Checking
1. Make sure that value is within the setting 6.9 ±2.5mN·m
(70 ±25gf·cm).
2. The winding-up torque fluctuates due to variation of
rotation torque of limiter pulley ass'y. Read the center
value of fluctuation as setting.
3. Set the EP record mode (x3) and make sure that the
winding-up torque is within setting.
• Adjustment
If the playback winding-up torque is not within the setting,
replace the limiter pulley assembly.
Note:
When the torque cassette is set, put a weight (500g) to
prevent rise.
When the cassette torque meter is taken out.
Turn off the power switch.
Figure 8-11.
Note:
Surely put the torque gauge on the reel disk to measure. If
the torque gauge is raised, accurate measurement is
impossible.
• Adjustment
If the rewinding playback winding-up torque is not within the
setting, replace the limiter pulley assembly.
Note:
The winding-up torque fluctuates due to variation of rota-
tion torque of supply reel disk. Read the center value of
fluctuation as setting.
Torque gauge
Supply reel disk
CCW