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2-3-3

H9740MA

To make sure that the tape path is well stabilized.

If the tape path is unstable, the tape will be damaged.

Note: Do not use an Test Tape for this procedure. If the
unit is not correctly aligned, the tape may be damaged.

1. Playback a blank cassette tape and check to see that

the tape runs without creasing at Guide Rollers [2]
and [3], and at points A and B on the lead surface.
(Refer to Fig. M3 and M4.)

2. If creasing is apparent, align the height of the guide

rollers by turning the top of Guide Rollers [2] and [3]
with a Guide Roller Adj. Screwdriver. (Refer to Fig.
M3 and M5.)

Guide Roller [2]

Guide Roller [3]

A

B

Take-up Guide Post [4]

ACE Head

Lead Surface of Cylinder

Tape

Take-up Guide
Post

Tape

Guide Roller

Tape

Correct

Incorrect

3. Check to see that the tape runs without creasing at

Take-up Guide Post [4] or without snaking between
Guide Roller [3] and ACE Head. (Fig. M3 and M5)

4. If creasing or snaking is apparent, adjust the Tilt Adj.

Screw of the ACE Head. (Fig. M6)

Azimuth Adj. Screw

Flat 
Screwdriver

Tilt Adj. Screw

ACE Head

To obtain maximum PB FM envelope signal at the preset
position of the Tracking Control Circuit, align the Horizontal
Position of the ACE Head.

If the Horizontal Position of the ACE Head is not properly
aligned, maximum PB FM envelope cannot be obtained
at the preset position of the Tracking Control Circuit.

1. Connect the oscilloscope to TP301 (C-PB) and TP503

(CTL) on the Main CBA. Use TP504 (RF-SW) as a
trigger.

2. Playback the Gray Scale of the Test Tape

(9HSFL6NS8) and confirm that the PB FM signal is
present.

3. Set the Tracking Control Circuit to the preset position

by pressing CH UP button on the remote control unit
then "PLAY" button on the unit. (Refer to note on
bottom of page 2-3-4.)

4. Use the Flat Screwdriver so that the PB FM signal at

TP301 (C-PB) is maximum. (Fig. M6)

5. To shift the CTL waveform, press CH UP or CH

DOWN button on the remote control unit. Then make
sure that the maximum output position of PB FM
envelope signal become within 

±

2ms from preset

position.

2-3-4

H9740MA

FM envelope output signal is low.

2ms

FM envelope signal

CTL signal

Center Position

FM envelope output signal 
is adjusted at maximum.

6. Set the Tracking Control Circuit to the preset position

by pressing CH UP button on the remote control unit.
and then "PLAY" button.

To achieve a satisfactory picture, adjust the PB FM
envelope becomes as flat as possible.

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.

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.

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.

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.

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.

Dropping envelope level at the beginning of track.

Dropping envelope level at the end of track.

Envelope is adjusted properly. (No envelope drop)

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."

2-3-5

H9740MA

To correct the Azimuth alignment so that the Audio/
Control/Erase Head meets tape tracks properly.

If the position of the Audio/Control/Erase Head is not
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)

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."

To make sure that the tape path is well stabilized during
reversing.

If the tape path is unstable during reversing, the tape will
be damaged.

Note: Do not use an Test Tape for this procedure. If the
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.)

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.)

Take-up Guide Post [4]

REV Post [5]

Take-up Guide
Post

Tape

REV Post

Tape

Correct

Incorrect

Tape Guide 
Assembly

Alignment 
Screw

2-4-1

H9740DA

Before following the procedures described below, be sure to remove the deck assembly from the cabinet. (Refer to
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.

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)