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3

Next, change the alignment tape to VROCPSV to
playback. Press the tracking button (+), (–) and
change the envelope waveform from max to min and
from min to max. At this time adjust the height of
supply and take-up side guide roller with the adjust-
ment driver (JiGDRiVERH-4) so that the envelope
waveform changes nearly parallel.

4

If the tape is lifted or sunk from the helical lead
surface, the PB CHROMA envelope waveform ap-
pears as shown in Figure 4-35.

5

Press the tracking button (+), (–) and make sure that
the envelope waveform changes nearly parallel.

6

Finally check tape crease near the reverse guide. If
tape crease is found, remove it as stated in Page 19
"HEIGHT ADJUSTMENT OF REVERSE GUIDE"
item 3.

3

Move the A/C head with the X value adjustment gear
driver by the method shown in Figure 4-33, and
adjust the A/C head so as to get the maximum
envelope waveform. (Note: At this time adjust so as
to get the maximum envelope waveform nearest the
A/C head position which has been set in case of X
value rough adjustment as stated in Page 20, 3- 

2

.)

4

Tighten finally the screws 

1

 and 

2

. Be sure to

tighten at first the screw 

1

 and then the screw 

2

.

Final tightening torque is 0.6N·m (If the screw 

2

 is

tightened first, the X value may deviate.)

5

Adjust the playback switching point (Refer to the
electric adjustment method.)

6

Playback the self-picture-recorded tape, and check
the flatness of envelope waveform and sound.

Notes:
When the A/C head X value adjustment is performed, be
sure to perform at first X value rough adjustment (refer to
Page 20, 3-

2

).

Take-up side

Supply side

Take-up side

Adjustment

Supply side

Supply side guide roller
rotated in clockwise
direction (lowers guide
roller) to flatten
envelope.

Take-up side guide roller
rotated in clockwise
direction (lowers guide
roller) to flatten
envelope.

Supply side guide roller
rotated in counterclock-
wise direction (raises
guide roller) to make the
tape float above the helical
lead. The supply
side guide roller is then
rotated in the clockwise
direction to flatten the
envelope.

Take-up side guide roller
rotated in counterclock-
wise direction (raises
guide roller) to make the
tape float above the
helical lead. The take-up
side guide roller is then
rotated in the clockwise
direction to flatten the
envelope.

When the tape is below the helical lead.

When the tape is above the helical lead.

1

2

PB CHROMA
Envelope

CH-1

CH-2

4. A/C head X value adjustment

1

Tentatively fix A/C head arm screws 

1

 and 

2

 by the

method described in Page 18 "Replacement 3".

2

Playback the alignment tape VROCPSV, and
shortcircuit TP802. As a result the auto-tracking is
automatically cancelled, so that the X value adjust-
ment mode is set.

1. Set the ejection mode.
2. Withdraw the main power plug from the socket.

• Removal (Perform in numerical order.)
1. Disconnect the FFC cable 

1

.

2. Unscrew the D.D. stator assembly fixing screws 

2

.

3. Take out the D.D. stator assembly 

3

.

4. Unscrew the D.D. rotor assembly fixing screws 

4

.

5. Take out the D.D. rotor assembly 

5

.

Notes:
1. In removing the D.D. stator assembly, part of the drum

earth spring pops out of the pre-load collar.
Be careful not to lose it.

2. Install, so that the D.D. rotor ass'y and upper drum ass'y

mounting direction check holes align.
(Align the upper drum dent with the rotor hole.)

3. Be careful not to damage the upper drum or the video

head.

4. Protect the hole elements from shock due to contact with

D.D. stator or D.D. rotor ass'y.

5. After installation adjust the playback switching point for

adjustment of servo circuit.

• Remove the mechanism from the main PWB (refer to

Page 5 item 1. When removing the mechanism from the
main PWB").

1. Remove the reel belt 

1

.

2. Remove the slow brake lever 

2

.

3. Remove the three screws 

3

.

2

4

4

5

D.D. stator ass'y

D.D. rotor ass'y

Upper drum

3

1

FFC

Capstan D.D.
motor

Capstan D.D. motor
control PWB

3

1

Reel belt

2

Slow Brake lever

• Reassembly
1. Taking care so that the capstan shaft does not contact

the mechanism chassis, set its position on the mecha-
nism chassis, and then install with the three screws.

2. Install the slow brake lever.
3. Install the reel belt.
Notes:
1. Before installing the capstan D.D. motor, confirm  whether

an acetate tape (ZTAPEN120020E) is drawn on the
back of mechanism chassis.

2. After installing the capstan D.D. motor, be sure to

rotate the capstan D.D. motor and check the move-
ment.

3. Set the tape, and check for the tape crease near the

reverse guide in the playback mode. Adjust the A/C
head and azimuth as stated in Page 20 Replacement
2. If crease is found, adjust as stated in Page 19
"HEIGHT ADJUSTMENT OF REVERSE GUIDE".

MechanismChassis from the back.

Stick an acetate tape on the 
projection part of the chassis.

Capstan Motor 
installation position.

1. Assemble the pinch roller assembly and pinch drive

cam.

2. Mounting the shifter (on the back of the mechanism

chassis).

3. Mounting the master cam (on the back of the mecha-

nism chassis).

4. Assemble the connection gear, slow brake and loading

motor parts.

(Place the following parts in position in numerical order.)
(1)Reverse drive lever 

1

(2)Reverse guide spring 

2

(3)Reverse guide lever ass’y 

3

(4)Reverse guide height adjusting nut 

4

(5)Pinch drive cam 

5

(6)Pinch roller ass’y 

6

(7)Open lever 

7

• Replacement (Perform in the numerical order)

1

Remove the motor as stated in Page 22 D.D. motor
replacement.

2

Remove the drum earth brush ass’y 

2

.

3

Remove the drum base 

3

 from the upper and lower

drum assembly 

1

.

[Cares when replacing the drum]
1. Be careful so that the drum earth brush is not lost.
2. Do not touch directly the drum surface.
3. Fit gently the screwdriver to the screws.
4. Since the drum assembly is an extremely precise as-

sembly, it must be handled with utmost care.

5. Make sure that the drum surface is free from dust, dirt

and foreign substances.

6. After replacing the drum  be sure to perform the tape

running adjustment.
After that, perform also the electrical adjustment.
• Playback switching point adjustment
• X-position adjustment and check
• Standard and x-3 slow tracking adjustment

7. After replacing the drum clean the drum.

7

4

3

2

6

1

5

2

1

3

1

Insert Reverse Guide Lever Ass’y

Phase Matching Point 

2

Pinch Roller Double
Action Lever Ass'y

Open lever

2

Insert Pinch Roller/Pinch Double Action Lever Ass’y.

3

Insert Open Lever.

Insert reverse guide lever ass'y

Align here.

2

 Insert pinch drive cam

Pinch drive lever ass'y

Fit the pinch drive cam so that the notch of pinch
drive cam aligns with the dent of pinch drive lever
assembly.

Fit the pinch drive cam so that the notch of
pinch drive lever assembly aligns with the
half-round notch of chassis.

Turn the reverse guide lever
assembly counterclockwise
to the stopper.