Sharp DV-NC100H (serv.man6) Service Manual ▷ View online
2-3-4
H9740MA
No Good
Good
FM envelope output signal is low.
2ms
FM envelope signal
CTL signal
Center Position
FM envelope output signal
is adjusted at maximum.
is adjusted at maximum.
Fig. M7
6. Set the Tracking Control Circuit to the preset position
by pressing CH UP button on the remote control unit.
and then "PLAY" button.
and then "PLAY" button.
1-C. Checking/Adjustment of Enve-
lope Waveform
Purpose:
To achieve a satisfactory picture, adjust the PB FM
envelope becomes as flat as possible.
envelope becomes as flat as possible.
Symptom of Misalignment:
If the envelope output is poor, noise will appear in the
picture. The tracking will then lose precision and the
playback picture will be distorted by any slight variation
of the Tracking Control Circuit.
picture. The tracking will then lose precision and the
playback picture will be distorted by any slight variation
of the Tracking Control Circuit.
1. Connect the oscilloscope to TP301 (C-PB) on the
Main CBA. Use TP504 (RF-SW) as a trigger.
2. Playback the Gray Scale on the Test Tape
(9HSFL6NS8). Set the Tracking Control Circuit to the
preset position by pressing CH UP button and then
"PLAY" button on the unit. Adjust the height of Guide
Rollers [2] and [3] (Fig. M3, Page 2-3-3) watching the
oscilloscope display so that the envelope becomes
as flat as possible. To do this adjustment, turn the top
of the Guide Roller with the Guide Roller Adj. Screw-
driver.
preset position by pressing CH UP button and then
"PLAY" button on the unit. Adjust the height of Guide
Rollers [2] and [3] (Fig. M3, Page 2-3-3) watching the
oscilloscope display so that the envelope becomes
as flat as possible. To do this adjustment, turn the top
of the Guide Roller with the Guide Roller Adj. Screw-
driver.
3. If the envelope is as shown in Fig. M7, adjust the
height of Guide Roller [2] (Refer to Fig. M3) so that the
waveform looks like the one shown in Fig. M9.
waveform looks like the one shown in Fig. M9.
4. If the envelope is as shown in Fig. M8, adjust the
height of Guide Roller [3] (Refer to Fig. M3) so that the
waveform looks like the one shown in Fig. M9.
waveform looks like the one shown in Fig. M9.
5. When Guide Rollers [2] and [3] (Refer to Fig. M3) are
aligned properly, there is no envelope drop either at
the beginning or end of track as shown in Fig. M9.
the beginning or end of track as shown in Fig. M9.
Dropping envelope level at the beginning of track.
Fig. M8
Dropping envelope level at the end of track.
Fig. M9
Envelope is adjusted properly. (No envelope drop)
Fig. M10
Note: Upon completion of the adjustment of Guide
Rollers [2] and [3] (Refer to Fig. M3), check the X Value
by pushing the CH UP or DOWN buttons alternately, to
check the symmetry of the envelope. Check the number
of pushes to ensure preset position. The number of
pushes CH UP button to achieve 1/2 level of envelope
should match the number of pushes CH DOWN button
from center. If required, redo the "X Value Alignment."
Rollers [2] and [3] (Refer to Fig. M3), check the X Value
by pushing the CH UP or DOWN buttons alternately, to
check the symmetry of the envelope. Check the number
of pushes to ensure preset position. The number of
pushes CH UP button to achieve 1/2 level of envelope
should match the number of pushes CH DOWN button
from center. If required, redo the "X Value Alignment."
2-3-5
H9740MA
1-D. Azimuth Alignment of Audio/
Control/ Erase Head
Purpose:
To correct the Azimuth alignment so that the Audio/
Control/Erase Head meets tape tracks properly.
Control/Erase Head meets tape tracks properly.
Symptom of Misalignment:
If the position of the Audio/Control/Erase Head is not
properly aligned, the Audio S/N Ratio or Frequency
Response will be poor.
properly aligned, the Audio S/N Ratio or Frequency
Response will be poor.
1. Connect the oscilloscope to the audio output jack on
the rear side of the deck.
2. Playback the Test Tape (9HSFL6NS8) and confirm
that the audio signal output level is 8kHz.
3. Adjust Azimuth Adj. Screw so that the output level on
the AC Voltmeter or the waveform on the oscilloscope
is at maximum. (Fig. M6)
is at maximum. (Fig. M6)
Note: Upon completion of the adjustment of Azimuth Adj.
Screw, check the X Value by pushing the CH UP or
DOWN buttons alternately, to check the symmetry of the
envelope. Check the number of pushes to ensure preset
position. The number of pushes CH UP button to achieve
1/2 level of envelope should match the number of pushes
CH DOWN button from center. If required, redo the "X
Value Alignment."
Screw, check the X Value by pushing the CH UP or
DOWN buttons alternately, to check the symmetry of the
envelope. Check the number of pushes to ensure preset
position. The number of pushes CH UP button to achieve
1/2 level of envelope should match the number of pushes
CH DOWN button from center. If required, redo the "X
Value Alignment."
1-E. Checking and Alignment of
Tape Path during reversing
Purpose:
To make sure that the tape path is well stabilized during
reversing.
reversing.
Symptom of Misalignment:
If the tape path is unstable during reversing, the tape will
be damaged.
be damaged.
Note: Do not use an Test Tape for this procedure. If the
unit is not correctly aligned, the tape may be damaged.
unit is not correctly aligned, the tape may be damaged.
1. Insert a black cassette tape into the tray and set the
unit to REV. Then confirm if the tape has been curled
up or bent at the Take-up Guide Post [4] or REV Post
[5] (Refer to Fig. M11 and M12.)
up or bent at the Take-up Guide Post [4] or REV Post
[5] (Refer to Fig. M11 and M12.)
2. When the tape has been curled up or bent, turn the
alignment screw to adjust the height of REV Post.
(Refer to Fig. M11 and M13.)
(Refer to Fig. M11 and M13.)
Take-up Guide Post [4]
REV Post [5]
Fig. M11
Take-up Guide
Post
Post
Tape
REV Post
Tape
Correct
Incorrect
Fig. M12
Fig. M13
Tape Guide
Assembly
Assembly
Alignment
Screw
Screw
2-4-1
H9740DA
DISASSEMBLY/ASSEMBLY PROCEDURES OF DECK
MECHANISM
Before following the procedures described below, be sure to remove the deck assembly from the cabinet. (Refer to
CABINET DISASSEMBLY INSTRUCTIONS.)
CABINET DISASSEMBLY INSTRUCTIONS.)
All the following procedures, including those for adjustment and replacement of parts, should be done in Eject mode;
see the positions of [44] and [45] in Fig. DM1H on page 2-4-3. When reassembling, follow the steps in reverse order.
see the positions of [44] and [45] in Fig. DM1H on page 2-4-3. When reassembling, follow the steps in reverse order.
No.
/LOC.
STEP
No.
ING
START-
PART
REMOVAL
INSTALLATION
Fig. No.
UNPLUG/DESOLDER
UNLOCK/RELEASE/
REMOVE/*UNHOOK/
CONDITION
ADJUSTMENT
[1]
[1]
Guide Holder A
T
DM3H
2(S-1)
[2]
[1]
Assembly
Cassette Holder
T
DM4H
[3]
[2]
Slider (SP)
T
DM5H
(S-1A), *(L-1)
[4]
[2]
Slider (TU)
T
DM5H
*(L-2)
[5]
[4]
Lock Lever
T
DM5H
*(L-3), *(P-1)
[6]
[2]
Cassette Plate
T
DM5H
[7]
[7]
Cylinder Assembly
T
DM1H, DM6H
Desolder, 3(S-2)
[8]
[8]
Assembly
Loading Motor
T
DM1H, DM7H
2(S-3)
Desolder, LDG Belt,
[9]
[9]
ACE Head Assembly
T
DM1H, DM7H
(S-4)
[10]
[2]
Assembly
Tape Guide Arm
T
DM1H, DM8H-1
*(P-2)
[11]
[10]
C Door Opener
T
DM1H, DM8H-1
(S-4A), *(L-4)
[12]
[11]
Pinch Arm (B)
T
DM8H-2
DM1H, DM8H-1,
*(P-3)
[13]
[12]
Assembly
Pinch Arm (A)
T
DM8H-2
DM1H, DM8H-1,
[14]
[14]
FE Head
T
DM1H, DM9H
(S-5)
[15]
[15]
Prism
T
DM1H, DM9H
(S-6)
[16]
[2]
Slider Shaft
T
DM10H
*(L-5)
[17]
[16]
C Drive Lever (SP)
T
DM10H
[18]
[16]
C Drive Lever (TU)
T
DM10H
(S-7), *(P-4)
[19]
[19]
Capstan Motor
B
DM2H, DM11H
3(S-8), Cap Belt
[20]
[20]
Clutch Assembly (HI)
B
DM2H, DM12H
(C-1)
[21]
[20]
Center Gear
B
DM12H
[22]
[22]
F Brake Assembly (HI)
B
DM2H, DM12H
*(L-6)
[23]
[22]
Worm Holder
B
DM2H, DM13H-1
(S-9), *(L-7), *(L-8)
[24]
[22]
Pulley Assembly (HI)
B
DM2H, DM13H-1
[25]
[25]
Mode Gear (LM)
B
DM2H, DM13H-1
(C-2)
[26]
[20],[25] Mode Lever (HI)
B
DM13H-2
DM2H, DM13H-1, (C-3)
[27]
[26]
[22],[23],
Cam Gear (A) (HI)
B
DM13H-2
DM2H, DM13H-1, (C-4)
Sec.Page 2-5-1
(+)Refer to Alignment
[28]
[26]
TR Gear C
B
DM2H, DM13H-1
(C-5)
2-4-2
H9740DA
No.
/LOC.
STEP
No.
ING
START-
PART
REMOVAL
INSTALLATION
Fig. No.
UNPLUG/DESOLDER
UNLOCK/RELEASE/
REMOVE/*UNHOOK/
CONDITION
ADJUSTMENT
[29]
[28]
TR Gear Spring
B
DM13H-1
[30]
[29]
TR Gear A/B
B
DM13H-1
[31]
[31]
FF Arm (HI)
B
DM1H, DM14H
[32]
[26]
Idler Assembly (HI)
B
DM1H, DM14H
*(L-9)
[33]
[26]
BT Arm
B
DM2H, DM14H
*(P-5)
[34]
[26]
Assembly
Loading Arm (SP)
B
DM2H, DM14H
Sec.Page 2-5-1
(+)Refer to Alignment
[35]
[34]
Assembly
Loading Arm (TU)
B
DM2H, DM14H
Sec.Page 2-5-1
(+)Refer to Alignment
[36]
[16],[26]
Assembly (HI)
M Brake (TU)
T
DM1H, DM15H
[37]
[2],[26]
Assembly (HI)
M Brake (SP)
T
DM1H, DM15H
*(P-6)
[38]
[37]
Assembly
Tension Lever
T
DM1H, DM15H
[39]
[38]
T Lever Holder
T
DM15H
*(L-10)
[40]
[40]
M Gear (HI)
T
DM1H, DM15H
(C-6)
[41]
[15],[40] Sensor Gear (HI)
T
DM1H, DM15H
(C-7)
[42]
[36],[40] Reel T
T
DM1H, DM15H
[43]
[38]
Reel S
T
DM1H, DM15H
[44]
[34],[38]
Preparation
Moving Guide S
T
DM1H, DM16H
(S-11), Slide Plate
[45]
[35]
Preparation
Moving Guide T
T
DM1H, DM16H
[46]
[19]
TG Post Assembly
T
DM1H, DM16H
*(L-11)
[47]
[27]
Rack Assembly
R DM17H
Sec.Page 2-5-1
(+)Refer to Alignment
[48]
[47]
F Door Opener
R DM17H
[49]
[49]
Cleaner Assembly
T
DM1H, DM6H
[50]
[49]
CL Post
T
DM6H
*(L-12)
(6)
(5)
(4)
(3)
(2)
(1)
(7)
(1): Follow steps in sequence. When reassembling, follow the steps in reverse order.
These numbers are also used as identification (location) No. of parts in the figures.
(2): Indicates the part to start disassembling with in order to disassemble the part in column (1).
(3): Name of the part
(4): Location of the part: T=Top B=Bottom R=Right L=Left
(5): Figure Number
(6): Identification of parts to be removed, unhooked, unlocked, released, unplugged, unclamped, or desoldered.
(3): Name of the part
(4): Location of the part: T=Top B=Bottom R=Right L=Left
(5): Figure Number
(6): Identification of parts to be removed, unhooked, unlocked, released, unplugged, unclamped, or desoldered.
P=Spring, W=Washer, C=Cut Washer, S=Screw, *=Unhook, Unlock, Release, Unplug, or Desolder
e.g., 2(L-2) = two Locking Tabs (L-2).
e.g., 2(L-2) = two Locking Tabs (L-2).
(7): Adjustment Information for Installation
(+):Refer to Deck Exploded Views for lubrication.
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