Hitachi VT-FX685A Service Manual

TK No. 5102E

VT-FX685A

SERVICE MANUAL

PLAY

STOP/EJECT

REW F.FWD

REC/IRT

VIDEO-IN

AUDIO-INL R

POWER

CHANNEL

TRACKING

VT-FX685AC

CONTENTS

MAIN SECTION

Specifications .......................................................1- 1 -1

Important Safety Precautions ..............................1- 2 -1

Standard Notes for Servicing ...............................1- 3 -1

Preparation for Servicing .....................................1- 4 -1

Operating Controls and Functions .......................1- 5 -1

Cabinet Disassembly Instructions .......................1- 6 -1

Electrical Adjustment Instructions .......................1- 7 -1

Block Diagrams ....................................................1- 8 -1

Function Indicator Symbols ................................ 1- 8 -11

SchematicDiagrams / CBA' s and Test Points ...1- 9 -1

Waveforms ...........................................................1- 9 -8

Wiring Diagram ................................................1-10-1

System Control Timing Charts ..............................1-11-1

IC Pin Function .....................................................1-12-1

Lead Identifications ...............................................1-13-1

This video deck is VHS type video
recorder. For proper operation, only
the VHS type cassette must be
used.

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

VIDEO CASSETTE RECORDER

DECK MECHANISM SECTION

Standard Maintenance ......................................... 2- 1 -1

Fixture and Tape for Adjustment ......................... 2- 2 -1

Mechanical Alignment Procedures ...................... 2- 3 -1

Disassembly / Assembly Procedures of

Deck Mechanism ..... 2- 4 -1

Alignment Procedures of Mechanism .................. 2- 4 -9

EXPLODED VIEWS AND PARTS LIST SECTION

Exploded Views ................................................... 3- 1 -1

Mechanical Parts List ........................................... 3- 2 -1

Electrical Parts List .............................................. 3- 3 -1

May 2001

Digital Media Products Division, Tokai

MAIN SECTION

VIDEO CASSETTE RECORDER

VT-FX685A

VT-FX685AC

MAIN SECTION

● Specifications

● Preparation for Servicing

● Adjustment Procedures

● Schematic Diagrams

● CBA’ s

TABLE OF CONTENTS

Specifications.................................................................................................................................................... 1- 1 -1

Important Safety Precautions............................................................................................................................ 1- 2 -1

Standard Notes for Servicing............................................................................................................................ 1- 3 -1

Preparation for Servicing .................................................................................................................................. 1- 4 -1

Operating Controls and Functions .................................................................................................................... 1- 5 -1

Cabinet Disassembly Instructions..................................................................................................................... 1- 6 -1

Electrical Adjustment Instructions..................................................................................................................... 1- 7 -1

Block Diagrams................................................................................................................................................. 1- 8 -1

Function Indicator Symbols..............................................................................................................................1- 8 -11

Schematic Diagrams / CBA’ s and Test Points ................................................................................................. 1- 9 -1

Waveforms........................................................................................................................................................ 1- 9 -8

Wiring Diagram ................................................................................................................................................. 1-10-1

System Control Timing Charts .......................................................................................................................... 1-11-1

IC Pin Function ................................................................................................................................................ 1-12-1

Lead Identifications........................................................................................................................................... 1-13-1

SPECIFICATIONS

Description Unit Minimum Nominal Maximum Condition

1. Video

1-1 Video Output (PB) Vp-p 0.8 1.0 1.2
1-2 Video Output (R/P) Vp-p 0.8 1.0 1.2
1-3 Video S/N Y (R/P) dB 41 44 SP Mode
1-4 Video Color S/N AM (R/P) dB 35 44 SP Mode
1-5 Video Color S/N PM (R/P) dB 33 37 SP Mode
1-6 Resolution (PB) Line 210 230 SP Mode

2. Servo

2-1 Jitter Low (R/P) µs 0.05 0.1 SP Mode
2-2 Wow & Flutter (R/P) % 0.2 0.4 SP Mode

3. Normal Audio

3-1 Output (PB) dBV -10 -6 -2
3-2 Output (R/P) dBV -10 -6 -2 SP Mode
3-3 S/N (R/P) dB 38 43 SP Mode
3-4 Distortion (R/P) % 2 4.0 SP Mode
3-5 Freq. response (R/P) at 200Hz dB -6 0 SP Mode
(-20dB ref. 1kHz) at 8kHz dB -6 -1.5 SP Mode

4. Tuner

4-1 Video Output Vp-p 0.8 1.0 1.2 E-E Mode
4-2 Video S/N (S/N Y signal) dB 40 47 E-E Mode
4-3 Audio Output (1kHz) dBV -10 -6 -4 E-E Mode
4-4 Audio S/N (1kHz) dB 40 46 E-E Mode

Note: Nominal specs represent the design specs. All units should be able to approximate these – some will exceed
and some may drop slightly below these specs. Limit specs represent the absolute worst condition that still might be
considered acceptable; In no case should a unit fail to meet limit specs.

1-1-1

IMPORTANT SAFETY PRECAUTIONS

Product Safety Notice

Some electrical and mechanical parts have special
safety-related characteristics which are often not evi­dent from visual inspection, nor can the protection they
give necessarily be obtained by replacing them with
components rated for higher voltage, wattage, etc. Parts
that have special safety characteristics are identified by
a # on schematics and in parts lists. Use of a substi­tute replacement that does not have the same safety
characteristics as the recommended replacement part
might create shock, fire, and/or other hazards. The
Product’s Safety is under review continuously and new
instructions are issued whenever appropriate. Prior to
shipment from the factory, our products are carefully
inspected to confirm with the recognized product safety
and electrical codes of the countries in which they are
to be sold. However, in order to maintain such compli­ance, it is equally important to implement the following
precautions when a set is being serviced.

Precautions during Servicing

A.Parts identified by the # symbol are critical for

safety. Replace only with part number specified.

B.In addition to safety, other parts and assemblies are

specified for conformance with regulations applying
to spurious radiation. These must also be replaced
only with specified replacements.

Examples: RF converters, RF cables, noise block­ing capacitors, and noise blocking filters, etc.

C.Use specified internal wiring. Note especially:

1) Wires covered with PVC tubing

2) Double insulated wires

3) High voltage leads

D.Use specified insulating materials for hazardous live

parts. Note especially:

1) Insulation tape

2) PVC tubing

3) Spacers

4) Insulators for transistors

E.When replacing AC primary side components

(transformers, power cord, etc.), wrap ends of wires
securely about the terminals before soldering.

F. Observe that the wires do not contact heat produc-

ing parts (heatsinks, oxide metal film resistors, fus­ible resistors, etc.).

G.Check that replaced wires do not contact sharp

edges or pointed parts.

H.When a power cord has been replaced, check that

5 - 6 kg of force in any direction will not loosen it.

I.Also check areas surrounding repaired locations.

J.Use care that foreign objects (screws, solder drop-

lets, etc.) do not remain inside the set.

K.Crimp type wire connector

The power transformer uses crimp type connectors
which connect the power cord and the primary side
of the transformer. When replacing the transformer,
follow these steps carefully and precisely to prevent
shock hazards.

Replacement procedure

1)Remove the old connector by cutting the wires at a
point close to the connector.

Important: Do not re-use a connector. (Discard it.)

2)Strip about 15 mm of the insulation from the ends of
the wires. If the wires are stranded, twist the strands
to avoid frayed conductors.

3)Align the lengths of the wires to be connected. Insert
the wires fully into the connector.

4)Use a crimping tool to crimp the metal sleeve at its
center. Be sure to crimp fully to the complete closure
of the tool.

L.When connecting or disconnecting the internal con-

nectors, first, disconnect the AC plug from the AC
outlet.

1-2-1

Safety Check after Servicing

Examine the area surrounding the repaired location for
damage or deterioration. Observe that screws, parts,
and wires have been returned to their original positions.
Afterwards, do the following tests and confirm the speci­fied values to verify compliance with safety standards.

1. Clearance Distance

When replacing primary circuit components, confirm
specified clearance distance (d) and (d’) between sol­dered terminals, and between terminals and surround­ing metallic parts. (See Fig. 1)

Table 1 : Ratings for selected area

AC Line Voltage Clearance Distance (d) (d’)

120 V ≥ 3.2 mm (0.126 inches)

Note: This table is unofficial and for reference only.
Be sure to confirm the precise values.

2. Leakage Current Test

Confirm the specified (or lower) leakage current be­tween B (earth ground, power cord plug prongs) and
externally exposed accessible parts (RF terminals, an­tenna terminals, video and audio input and output ter­minals, microphone jacks, earphone jacks, etc.) is lower
than or equal to the specified value in the table below.

Measuring Method (Power ON) :

Insert load Z between B (earth ground, power cord plug
prongs) and exposed accessible parts. Use an AC
voltmeter to measure across the terminals of load Z.
See Fig. 2 and the following table.

Z

1.5kΩ

Chassis or Secondary Conductor

Primary Circuit Terminals

dd'

Exposed Accessible Part

AC Voltmeter

0.15µF

Earth Ground

B

Power Cord Plug Prongs

(High Impedance)

Fig. 1

Fig. 2

Table 2 : Leakage current ratings for selected areas

AC Line Voltage Load Z Leakage Current (i) Earth Ground (B) to:

120 V

Note: This table is unofficial and for reference only. Be sure to confirm the precise values.

0.15µF CAP. & 1.5kΩ RES.

Connected in parallel

i ≤ 0.5mA Peak Exposed accessible parts

1-2-2

STANDARD NOTES FOR SERVICING

Circuit Board Indications

a.The output pin of the 3 pin Regulator ICs is indicated

as shown.

Top View

Out

b.For other ICs, pin 1 and every fifth pin are indicated

as shown.

Input

In

Bottom View

5

Pin 1

10

c.The 1st pin of every male connector is indicated as

shown.

Pin 1

Instructions for Connectors

1.When you connect or disconnect the FFC (Flexible
Foil Connector) cable, be sure to first disconnect the
AC cord.

2.FFC (Flexible Foil Connector) cable should be in­serted parallel into the connector, not at an angle.

How to Remove / Install Flat Pack-IC

1. Removal

With Hot-Air Flat Pack-IC Desoldering Machine:

(1)Prepare the hot-air flat pack-IC desoldering ma-

chine, then apply hot air to the Flat Pack-IC (about
5 to 6 seconds). (Fig. S-1-1)

Fig. S-1-1

(2)Remove the flat pack-IC with tweezers while apply-

ing the hot air.

(3)Bottom of the flat pack-IC is fixed with glue to the

CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)

(4)Release the flat pack-IC from the CBA using tweez-

ers. (Fig. S-1-6)

Caution:

1.Do not supply hot air to the chip parts around the flat
pack-IC for over 6 seconds because damage to the
chip parts may occur. Put masking tape around the
flat pack-IC to protect other parts from damage.
(Fig. S-1-2)

2.The flat pack-IC on the CBA is affixed with glue, so
be careful not to break or damage the foil of each
pin or the solder lands under the IC when removing
it.

FFC Cable

Connector

CBA

* Be careful to avoid a short circuit.

1-3-1

CBA

Masking
Tape

Tweezers

Hot-air
Flat Pack-IC
Desoldering
Machine

Flat Pack-IC

Fig. S-1-2

With Soldering Iron:

(1)Using desoldering braid, remove the solder from all

pins of the flat pack-IC. When you use solder flux
which is applied to all pins of the flat pack-IC, you
can remove it easily. (Fig. S-1-3)

(4)Bottom of the flat pack-IC is fixed with glue to the

CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)

(5)Release the flat pack-IC from the CBA using tweez-

ers. (Fig. S-1-6)

Flat Pack-IC

Desoldering Braid

Soldering Iron

Fig. S-1-3

(2)Lift each lead of the flat pack-IC upward one by one,

using a sharp pin or wire to which solder will not
adhere (iron wire). When heating the pins, use a fine
tip soldering iron or a hot air desoldering machine.
(Fig. S-1-4)

Sharp
Pin

Note:

When using a soldering iron, care must be taken to
ensure that the flat pack-IC is not being held by glue.
When the flat pack-IC is removed from the CBA,
handle it gently because it may be damaged if force
is applied.

Hot Air Blower

or

Iron Wire

Soldering Iron

To Solid
Mounting Point

Fig. S-1-5

Fine Tip

Fig. S-1-4

Soldering Iron

(3)Bottom of the flat pack-IC is fixed with glue to the

CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)

(4)Release the flat pack-IC from the CBA using tweez-

ers. (Fig. S-1-6)

With Iron Wire:

(1)Using desoldering braid, remove the solder from all

pins of the flat pack-IC. When you use solder flux
which is applied to all pins of the flat pack-IC, you
can remove it easily. (Fig. S-1-3)

(2) Affix the wire to a workbench or solid mounting point,

as shown in Fig. S-1-5.

(3)While heating the pins using a fine tip soldering iron

or hot air blower, pull up the wire as the solder melts
so as to lift the IC leads from the CBA contact pads
as shown in Fig. S-1-5.

CBA

Tweezers

Fine Tip
Soldeing Iron

Flat Pack-IC

Fig. S-1-6

1-3-2

2. Installation

(1)Using desoldering braid, remove the solder from the

foil of each pin of the flat pack-IC on the CBA so you
can install a replacement flat pack-IC more easily.

(2)The " ● " mark on the flat pack-IC indicates pin 1.

(See Fig. S-1-7.) Be sure this mark matches the 1
on the PCB when positioning for installation. Then
pre- solder the four corners of the flat pack-IC. (See
Fig. S-1-8.)

(3)Solder all pins of the flat pack-IC. Be sure that none

of the pins have solder bridges.

Example :

Pin 1 of the Flat Pack-IC
is indicated by a " ● " mark.

Fig. S-1-7

Instructions for Handling Semiconductors

Electrostatic breakdown of the semiconductors may
occur due to a potential difference caused by electro­static charge during unpacking or repair work.

1. Ground for Human Body

Be sure to wear a grounding band (1MΩ) that is properly
grounded to remove any static electricity that may be
charged on the body.

2. Ground for Workbench

Be sure to place a conductive sheet or copper plate with
proper grounding (1MΩ) on the workbench or other
surface, where the semiconductors are to be placed.
Because the static electricity charge on clothing will not
escape through the body grounding band, be careful to
avoid contacting semiconductors with your clothing.

< Incorrect >

CBA

Presolder

Flat Pack-IC

CBA

< Correct >

Grounding Band

Fig. S-1-8

1MΩ

CBA

1MΩ

Conductive Sheet or
Copper Plate

1-3-3

PREPARATION FOR SERVICING

How to Enter the Service Mode

About Optical Sensors

Caution:

An optical sensor system is used for the Tape Start and
End Sensors on this equipment. Carefully read and
follow the instructions below. Otherwise the unit may
operate erratically.

What to do for preparation

Insert a tape into the Deck Mechanism Assembly and
press the PLAY button. The tape will be loaded into the
Deck Mechanism Assembly. Make sure the power is
on, connect TP502 (SENSOR INHIBITION) to TP511
(GROUND). This will stop the function of Tape Start
Sensor, Tape End Sensor and Reel Sensors. (If these
TPs are connected before plugging in the unit, the
function of the sensors will stay valid.) See Fig. 1.

Note: Because the Tape End Sensors are inactive, do
not run a tape all the way to the start or the end of the
tape to avoid tape damage.

About REC-Safety Switch

Caution:

The REC-Safety Switch is directly mounted on the Main
CBA. When the Deck Mechanism Assembly is removed
from the Main CBA for servicing, this switch does not
work automatically.

What to do for preparation

In order to record, press the Rec button while pushing
REC-SAFETY SW on the Main CBA. See Fig. 1.

CN501

Q503

CN251

SW506

(REC-SAFETY SW)

CN504

TP511

GND

CN502

CN503

Q504

TP502

S-INH

Fig. 1

1-4-1

OPERATING CONTROLS AND FUNCTIONS

Model: VT-FX685A / VT-FX685AC

 VCR FRONT PANEL 

AUDIO-INLR

VIDEO-IN

27

30

 VCR REAR PANEL 

25

25

1

POWER

6

CHANNEL

TRACKING

91087

26

26

AUDIO

OUT

VIDEO

OUT

OUT IN

OUT IN

29 30 3231

29 30 3231

2 3 4 5

REC/IRT

27

L

IN

R

AUDIO

L

CH3 CH4

IN

R

VIDEO

CH3 CH4

1.Cassette Compartment

2.REW button– Press to rewind the tape, or to view

the picture rapidly in reverse during the playback
mode. (Rewind Search)

s

button– Press to cancel a setting of timer pro-

gram. Press to correct digits when setting program
(For example: setting clock or timer program). Press
to add or delete channel numbers during channel
preset. (only on the remote control)

3. STOP button– Press to stop the tape motion.
EJECT button– Press to remove a tape from the

VCR. (only on the VCR)
▼ button– Press to enter digits when setting pro-

gram (For example: setting clock or timer program).
Press to select the setting modes from the on screen
menu. (only on the remote control)

4.PLAY button– Press to begin playback.
▲ button– Press to enter digits when setting pro-

gram (For example: setting clock or timer program).
Press to select the setting modes from the on screen
menu. (only on the remote control)

5.F.FWD button– Press to rapidly advance the tape,
or view the picture rapidly in forward during play­back. (Forward Search)

B button– When setting program (For example:
setting clock or timer program), press to determine
your selection and proceed to the next step you want
to input. Press to determine the setting modes from
the on screen menu. Press to add or delete channel
numbers during channel preset. (only on the remote
control)

27

STOP/EJECT

ANT

REW F.FWD

28

28

IN

ANT

OUT

IN

OUT

 REMOTE CONTROL 

PLAY

POWER

6

123

11

12
13

456

789

TAPE SPEED

DISPLAYMENU

14

2
3

10
24

REW

REC

VCR PIus+

0

PLAY

STOP

CATV

TVVCR

VCR/TV

CH

ENTER

+100

MUTE

VOL

F.FWD

PAUSE

SLOW

SEARCH MODE

EXIT COUNTER

RESET

MEMORY

6.POWER button– Press to turn VCR on and off.

Press to activate timer recording.

7.Remote sensor window– Receives the infrared

signals from the remote control.

8.Digital display

A
B
C

D
E
F

A.PWR. (Power) indicator– Indicates that the power

is turned on.

B.Cassette indicator– Indicates that there is a tape

in the VCR.

C.VCR indicator– Indicates that the VCR is in the

VCR position.

D.REC indicator– Indicates that it is recording.

Flashes when a recording has been paused.

E.w (Timer) indicator– Indicates that the timer recording

or an IRT recording has been set.

F. CLOCK indicator– Displays current time. PM indi-

cator appears when p.m.

9.CHANNEL(CH) ▲ / ▼ buttons– Press to select the

desired channels for viewing or recording.
Tracking function– Press to minimize video ‘noise’

(lines or dots on screen) during playback (only on
the VCR) or slow mode.

Press to stabilize the picture in the Still mode when
the picture begins to vibrate vertically.

23

22

9

21
20

4
5

19
18

17
16

15

1-5-1

10.REC button– Press for manual recording.
IRT button– Press to activates Instant Recording

Timer. (only on the VCR)

11.NUMBER buttons– Press to select desired chan­nels for viewing or recording. To select channels
from 1 to 9, first press "0" button then 1 to 9. (only
on the remote control)

+100 button– When selecting cable channels which
are higher than 99, press this button first, then press
the last two digits. (To select channel 125, first press
"+100" button then press "2" and "5"). (only on the
remote control)

ENTER– (only on the remote control)

12.TAPE SPEED button Press to choose the desired

recording speed : SP/SLP. (only on the remote control)

13. MENU button– Press to display the menu on the TV
screen. Press to exit the menu on the TV screen.
(only on the remote control)

14.DISPLAY button– Press to display the current time,
channel number, real time tape counter, and other
information on the TV screen. (only on the remote
control)

Each time you press this button, TV screen will
change as shown. The status display (STOP, PLAY
etc.) and the tape speed display (SP, LP (playback
only), or SLP) will disappear after 5 seconds.

<OFF mode>

<COUNT mode> <CLOCK mode>

Press
once

STOP

SP 0:12:34

Press once

Press

once

STOP

SP

5:40PM

CH 02

15.COUNTER RESET button– Press to reset counter
to 0:00:00. (only on the remote control)

EXIT button– Press to exit the menu on the TV
screen. (only on the remote control)

16.COUNTER MEMORY button– Press to set counter
memory on and off. (only on the remote control)

17.SEARCH MODE button– Press to perform a Time
Search or an Index Search. (only on the remote con­trol)

18. PAUSE button– Press to temporarily stop the tape

during recording or to view a still picture during
playback. (only on the remote control)

Frame Advance function– Press to advance the
picture by one frame at a time during the still mode.
(only on the remote control)

19. SLOW button– Press to start slow motion playback.

(only on the remote control)

20.MUTE button– Press to mute the TV’s sound. Press

it again to resume the sound. (only on the remote
control)

21.VOL(ume) buttons– Press to adjust the desired

TV’s volume level by using either ▲ or ▼ button.
(only on the remote control)

22.VCR/TV button– Press to select TV or VCR mode.

(only on the remote control)
VCR position: to view playback, to monitor video

recordings or watch TV using the VCR tuner.
TV position: to watch TV or to view one program

while recording another.

23.MODE SELECT buttons

(only on the remote control)

CATV button
TV button
VCR button

24.VCR Plus+ button– Press to program the automat-

ic timer recording using the VCR Plus+ system.
(only on the remote control)

25.Power cord– Connect to a standard AC outlet

(120V/60Hz).

26.AUDIO OUT jacks– Connect to the audio input

jacks of your audio equipment or another VCR.

27.AUDIO IN jacks– Connect to the audio output jacks

of your audio equipment or another VCR.

28.ANT. IN terminal– Connect to an antenna, Cable

system or Satellite system.

29.VIDEO OUT jack– Connect to the video input jack

of your video camera or another VCR.

30.VIDEO IN jack– Connect to the video output jack of

your video camera or another VCR.

31.CH3/CH4 selector switch– Use to select a video

output channel (3 or 4) for VCR playback.

32.ANT. OUT terminal– Connects to the antenna input

terminal on your TV.

1-5-2

CABINET DISASSEMBLY INSTRUCTIONS

1. Disassembly Flowchart

This flowchart indicates the disassembly steps to gain
access to item(s) to be serviced. When reassembling,
follow the steps in reverse order. Bend, route, and dress
the cables as they were originally.

[1] Top Case

[2] Front Assembly

[3] Deck Assembly

[4] Cylinder Shield

[5] REC Arm Assembly

[6] Main CBA

[7] Function CBA

Disassembly Method

REMOVAL

ID/

LOC.

No.

[1] Top Case 1 3(S-1) -

[2]

[3]

[4]

[5]

[6] Main CBA 4 *2(L-4) -

[7]

↓

➀

PART

Front
Assembly

Deck
Assembly

Cylinder
Shield

REC Arm
Assembly

Function
CBA

↓

➁

REMOVE/

Fig.

*UNHOOK/UNLOCK/

No.

RELEASE/UNPLUG/
DESOLDER

2 *3(L-1), *4(L-2)

3 6(S-2), Spacer,

*(CN251, CN501,
CN502, CN503,
CN504)

32(S-3)

3 ----------

4 *(L-3), Desolder

↓

➂

↓

➃

Note

-

1, 2

-

-

3

↓

➄

Reference Notes

CAUTION: Locking Tabs (L-1) and (L-2) are fragile. Be
careful not to break them.

1. Remove six Screws (S-2) and the Spacer. Then
slowly lift the Deck Assembly up. Lifting Deck As­sembly disconnects five Connectors (CN251,
CN501, CN502, CN503, CN504). (Fig. 3)

2. Before installing the Deck Assembly, be sure to
place the pin of LD-SW on Main CBA as shown in
Fig. 5. Then, install the Deck Assembly while align­ing the hole of Cam Gear with the pin of LD-SW, the
shaft of Cam Gear with the hole of LD-SW as shown
in Fig. 5.

3. After removing the Main CBA, desolder from bottom
of the Main CBA as shown in Fig. 4 to remove the
Function CBA.

(S-1)

[1]Top Case

1 : Identification (location) No. of parts in the figures
2 : Name of the part
3 : Figure Number for reference
4 : Identification of parts to be removed, unhooked, un-

locked, released, unplugged, unclamped, or
desoldered.
P=Spring, L=Locking Tab, S=Screw,
CN=Connector
*=Unhook, Unlock, Release, Unplug, or Desolder
e.g. 2(S-2) = two Screws (S-2),
2(L-2) = two Locking Tabs (L-2)

5 :Refer to "Reference Notes."

Fig. 1

1-6-1

(L-2)

(L-2)

(S-2)

(L-1)

(S-3)

Spacer

CN501

[2]Front Assembly

Fig. 2

[4]Cylinder Shield

(S-3)

(S-2)

[3]Deck Assembly

CN504

CN502

Desolder from
bottom

(L-4)

[6]Main C.B.A.

[6]Main C.B.A.

[7]Function C.B.A.

(L-4)

(L-3)

Fig. 4

Pin

SW507
LD-SW

[4]REC Arm
Assembly

CN251

CN503

Fig. 3

1-6-2

[4]Deck Assembly

Shaft

Hole

LD-SW

Cam Gear

Hole

Pin

[6]Main C.B.A.

Fig. 5

ELECTRICAL ADJUSTMENT INSTRUCTIONS

General Note: "CBA" is an abbreviation for
"Circuit Board Assembly."

NOTE:

1.Electrical adjustments are required after replacing
circuit components and certain mechanical parts. It
is important to do these adjustments only after all
repairs and replacements have been completed.
Also, do not attempt these adjustments unless the
proper equipment is available.

2.To perform these alignment / confirmation proce­dures, make sure that the tracking control is set in
the center position: Press either channel "▼" or "▲"
button first, then the "PLAY" button (VCR’s Front
Panel only).

CH1

CH2

Figure 1

EXT. Syncronize Trigger Point

1.0H

6.5H

Switching Pulse

V-Sync

0.5H

Test Equipment Required

1.Oscilloscope: Dual-trace with 10:1 probe, V-Range:

0.001~50V/Div., F-Range: DC~AC-20MHz

2.Alignment Tape (MH-1)

Head Switching Position Adjust­ment

Purpose:

To determine the Head Switching point during play­back.

Symptom of Misadjustment:

May cause Head Switching noise or vertical jitter in
the picture.

Test Point Adj. Point Mode Input

TP751(V-OUT)

TP302(RF-SW)

TP511(GND)

Tape

MH-1 Oscilloscope

Connections of Measurement Equipment

VR501

(Switching Point)

(MAIN CBA)

Measurement

Equipment

PLAY

(SP)

6.5H±1H

(412.7µs±60µs)

----

Spec.

Reference Notes:

Play back the Alignment tape and adjust VR501 so that
the V-sync front edge of the CH1 video output waveform
is at the 6.5H(412.7µs) delayed position from the rising
edge of the CH2 head switching pulse waveform.

Main CBA

Oscilloscope

TP751
TP511
TP302

CH1 CH2
Trig. (+)

1-7-1

Servo/System Control Block Diagram BLOCK DIAGRAMS

(DECK ASSEMBLY)

AC HEAD ASSEMBLY

CONTROL
HEAD

CYLINDER ASSEMBLY

DRUM
MOTOR

PG
SENSOR

LOADING MOTOR ASSEMBLY

LOADING
MOTOR

CAPSTAN MOTOR

CAPSTAN
MOTOR

M

M

M

CN287

5 8CTL(+)
6 9CTL(-)

AL+15.5V/+12V

FG-GND

MAIN CBA

CN504

CN502
1D-W
2D-V
3D-U
4D-COM
5PG-IN

CN504
1LD-M(+)
2LD-M(-)

CN503
1C-F/R
2P-ON+5V
3
4C-FG
5C-POW-SW
6C-CONT
7
8CM-GND

IC301

TP303

CTL

P-ON+5V
AL+15.5V/+12V

(Y/C PROCESS)

CONTROL
AMP

9 23 19

IC506

(DRUM /LOADING MOTOR DRIVE)

25
24
22
21
15
16
17

4
2

+

-

DRIVE

TP506 TP505

ST-S

Q504

ST-S

18

DRUM
MOTOR
DRIVE

LOADING
MOTOR
CONTROL

Q503

END-S

AL+5V

D555
S-LED

T-REEL

Q506

T-REEL

TIMER+5V

14

20

18

9

SW507
LD-SW

AL+5V

RS501

REMOTE
SENSOR

TP510

LD-SW

PS502

S-REEL

Q501

RESET

VR501
SW-POINT

AL+5V

AL+5V

IC501

(SERVO/SYSTEM CONTROL)

KEY- 1

KEY- 2

REMOCON-IN

1

PB-CTL

54

REC-CTL(-)

20
19

REC-CTL(+)

LD-SW74

D-CONT56

D-FG

52

D-PG

53

LM-

59

FWD/REV

75

ST-S

68

END-S
T-REEL

49

S-REEL

50

34

RESET

C-F/R

48

51

C-FG
C-POW-SW46
C-CONT

55

71

PG-DELAY

I2C-BUS-CLK

I2C-BUS-DATA

Hi-Fi-CLK
Hi-Fi-DATA
Hi-Fi-H-SW

Hi-Fi-CS

Hi-Fi/NOR-IN

ST/SAP-IN

A-MUTE-H

D-REC-H

REC-SW

D-PB-H

INSEL/ST-SL

C-SYNC

D-V SYNC

V-ENV

C-ROTA

RF-SW

TRICK/C-G/APC

SP/LP/SLP

BLUEBACK-ON

H-A-SW

H-A-COMP

P-ON-L

P-DOWN-L

72

73

G1

81

G4 84

a

85

d

88

e

94

f 89

j

93

10

11
12
18

65
67

13
62
25

61

21
33
70
15
17
47
45
66
16
14

60
63

TP502

S-INH

KEY
SWITCH

TP511

GND

9

8

SW506

REC SW

7

CN507 CN651

3 1KEY 2

DRIVE

Q645~Q648

5

6

TU701(TUNER UNIT)

10

11

ST/SAP-MODE

AL+5V

INSEL/ST-SL

TRICK/C-G/APC

BLUEBACK-ON

FUNCTION CBA

KEY SWITCH

FIP502

LED DISPLAY

IC505

(MEMORY)

SDA

SCL

CLOCK

DATA

Hi-Fi-CLK
Hi-Fi-DATA
Hi-Fi-H-SW

Hi-Fi-CS

NORMAL-H

A-MUTE-H

A-MUTE-H

D-REC-H

D-PB-H

D-REC-H

D-PB-H

C-SYNC

D-V SYNC

V-ENV

C-ROTA

RF-SW

SP/LP/SLP

H-A-SW

H-A-COMP

P-ON-L

P-DOWN-L

C-POW-SW

TO Hi-Fi
AUDIO
BLOCK

TO AUDIO
BLOCK

FROM/TO
VIDEO BLOCK

FROM/TO
POWER
SUPPLY
BLOCK

1-8-1 1-8-2

Video Block Diagram

REC VIDEO SIGNAL PB VIDEO SIGNAL MODE: SP/REC

JK751
V-OUT

TU701

VIDEO-IN

VIDEO-OUT

JK752
REAR V-IN

JK753
FRONT V-IN

5

21

WF1

TP751
V-OUT

Q391

BUFFER

IC501

CHARA-OUT

BLUEBACK

OSD-

OSD-

30

IC301

(Y/C PROCESS)

3131

30

TUNER

42

REAR

38

40

FRONT

BLUEBACK

V-AGC

35

6dB

AMP

CHARA

MIX

FBC

R P

Y/C
MIX

MAIN CBA

45 47 49 44

CCD 1H

DELAY

DOC YNR Y/C COMB

CHROMINANCE

SIGNAL PROCESS

Q301

BUFFER

LUMINANCE

SIGNAL PROCESS

FROM/TO
SERVO/SYSTEM
CONTROL BLOCK

(DECK ASSEMBLY)

CYLINDER ASSEMBLY

VIDEO (R)-1 HEAD

VIDEO (L)-1 HEAD

VIDEO (L)-2 HEAD

VIDEO (R)-2 HEAD

INSEL/ST-SL
D-PB-H

D-REC-H
TRICK/C-G/APC

C-SYNC
C-ROTA
D-V SYNC
SP/LP/SLP
BLUEBACK-ON

71
16

REC/EE/PB

D-REC-H

11

TRICK/C-G/APC

73
34

C-ROTA

14

D-V SYNC

39

SP/LP/SLP

59

BLUEBACK-ON

41

SYNC
SEPA

R

P

AGC
AMP

CN251
1
2
3
4
5
6

V(R)-1

V-COM
V(L)-1
V(L)-2

V-COM
V(R)-2

91
90
89
88
85
84
83
82

R
L

SP

EP

L
R

HPF

ENV
DET

74

R

P

TP302

RF-SW

FROM/TO
SERVO/SYSTEM
CONTROL BLOCK

WF2

RF-SW
V-ENV
H-A-SW
H-A-COMP

13
93
15

H-A-COMP

94

TP301

C-PB

WF5

1-8-3 1-8-4

Audio Block Diagram

PB-AUDIO SIGNAL REC-AUDIO SIGNAL Mode : SP/REC

TU701

SIF OUT

AUDIO-IN

JK751

A-OUT (R)

A-OUT (L)

REAR

A-IN (L)

A-IN (R)

A-IN (L)

FRONT

A-IN (R)

JK752

JK754

JK755

(DECK ASSEMBLY)

19

MAIN CBA

SIF

N-A-OUT

WF8

1

TP753
A-OUT(R)

TP754
A-OUT(L)

IC301

(AUDIO PROCESS) 76

4

EQ
AMP

SP/LP-ON

3

1
2

100

ALC

R

MOD-A

A-OUT (R)

A-OUT (L)

A-IN (L)

A-IN (R)

A-IN (L)-F

A-IN (R)-F

N-A-IN

LINE
AMP

P

MUTE

96

TO Hi-Fi AUDIO
BLOCK

AUDIO
HEAD

AUDIO
ERASE
HEAD

FULL
ERASE
HEAD

AC HEAD ASSEMBLY

FE HEAD

CN287
A-PB/REC 4
A-COM 3
AE-H 1
AE-H 2

CN504
7 A-PB/REC
6 A-COM
4 AE-H
5 AE-H/FE-H

CN501
1 FE-H
2 FE-H-GND

Q422

BIAS
OSC

P-ON+5V

Q423 (PB=ON)

Q425

Q424
(PB=ON)

Q421

SWITCHING
D-REC OFF

P-ON+5V

99

AUTO
BIAS

6

7

REC
AMP

D-REC-H

11 12

1-8-5 1-8-6

REC/EE/PB

16

98

D-PB-H

A-MUTE-H

D-REC-H

FROM
SERVO/SYSTEM
CONTROL BLOCK

Hi-Fi Audio Block Diagram

SIF

IC451 (MTS/ SAP/ Hi-Fi AUDIO PROCESS/ Hi-Fi HEAD AMP)

NOISE
DET

57

SIF
DEMOD

SAP
FILTER

STEREO
FILTER

PILOT
DET

SAP
DEMOD

PILOT
CANCEL

L-R
DEMOD

MAIN CBA

ST/SAP
SW

DC

dBX
DEC

MATRIX

SERIAL
DATA
DECODER

RIPPLE
FILTER

REC-AUDIO SIGNALPB-AUDIO SIGNAL Mode : SP/REC

37
38
39

54

P-ON+9V

Hi-Fi-CS

Hi-Fi-DATA

Hi-Fi-CLK

TO SERVO/ SYSTEM
CONTROL BLOCK

TO
AUDIO BLOCK

A-IN(R)
A-IN(R)-F

N-A-OUT

A-IN(L)
A-IN(L)-F

69
71

STEREO
PLL

R-CH
PNR

R-CH
INSEL

6

7
9

NOR
SW

L-CH
INSEL

48 47

13 14

P

R

SW
NOISE

LIM DEV

COMP

VCO

HOLD
PULSE

NOISE
DET

LPF

MATRIX

R-CH BPF

OUTPUT
SELECT

COMP

ALC

BO
DET

MUTE

ENV
DET

MODE
OUT

51
23

80

78

77

40
49

26

ST/SAP-MODE

NORMAL-H

4

2

1

N-A-IN

A-OUT (L)

MOD-A

A-OUT (R)

Hi-Fi-H-SW

A-MUTE-H

TO SERVO/SYSTEM
CONTROL BLOCK

TO AUDIO BLOCK

TO SERVO/SYSTEM
CONTROL BLOCK

CYLINDER
ASSEMBLY

LPF

L-CH BPF

AGC

AGC
DET

31 30

R

L

24

27

CN251

Hi-Fi-A(R) 7
Hi-Fi-COM 8
Hi-Fi-A(L) 9

Hi-Fi
AUDIO
(R) HEAD

Hi-Fi
AUDIO
(L) HEAD

L-CH
PNR

R

P

LIM DEV

SW
NOISE

VCO

COMP

1-8-7 1-8-8

Power Supply Block Diagram

NOTE :
The voltage for parts in hot circuit is measured using
hot GND as a common terminal.

F

A V

AC001

F001
1A 250V

L001

CHOKE

COIL

D001 - D004

BRIDGE

RECTIFIER

F

A V

CAUTION

FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,
REPLACE ONLY WITH THE SAME TYPE FUSE.
ATTENTION : POUR UNE PROTECTION CONTINUE LES RISQES
D'INCELE N'UTILISER QUE DES FUSIBLE DE MEMO TYPE.

RISK OF FIRE

"This symbol means fast operating fuse."
"Ce symbole reprèsente un fusible à fusion rapide."

Q001

-REPLACE FUSE AS MARKED.

T001

2

4

11

12

13

14

Q052

CAUTION !

Fixed voltage power supply circuit is used in this unit.
If Main Fuse (F001) is blown, check to see that all components in the
power supply circuit are not defective before you connect the AC plug to
the AC power supply. Otherwise it may cause some components in the
power supply circuit to fail.

AL+12V
AL+44V
AL+12V
P-ON-L
P-ON+9V
TIMER+5V
AL+5V
P-ON+5V
P-DOWN-L
AL+15.5V/+12V
C-POW-SW

Q055

HOT

Q029

SWITCHING

CONTROL

Q002

7

6

IC001

ERROR
VOLTAGE DET

4

15

Q060

16

17

18

1

23

Q061

Q062

Q056

(SHUNT REGULATOR)

Q031

REG

COLD

1-8-9 1-8-10

MAIN CBA

FUNCTION INDICATOR SYMBOLS

Power Supply Trouble Shooting Guide

Note:

The following symbols will appear on the indicator panel to indicate the current mode or operation of the VCR.
On-Screen modes will also be momentarily displayed on the TV screen when you press the operation buttons.

Display panel

LED MODE INDICATOR ACTIVE

CASSETTE "IN"
CASSETTE "OUT"

VCR/TV VCR MODE
VCR/TV TV MODE

CLOCK " 88:88 "

POWER ON " PWR. " ON
REC " REC " ON
REC PAUSE " REC " Blinks at 0.8Hz interval
T-REC, OTR " " ON

When reel and capstan mechanism is not
functioning correctly

When tape loading mechanism is not func­tioning correctly

When cassette loading mechanism is not
functioning correctly

When the drum is not working properly " "

S-INH condition All modes Blinks at 0.8Hz interval

" "
" "

" VCR "
" VCR "

" PM "

" "
" 1 "

" "
" 2 "

" "
" 3 "

" 4 "

ON
OFF

ON
OFF

ON
ON/OFF

(T-REC OFF, T-REC incomplete
Blinks at 0.8Hz interval)

Blinks at 0.8Hz interval

Blinks at 0.8Hz interval

Blinks at 0.8Hz interval

Blinks at 0.8Hz interval

It is highly recommended that a variable isolation
transformer which can monitor current be used.
(Alternatively a variable AC source which monitors
current will do). Read directions below before power
is added!

Repair method

CHECK

Connect unit to the isolation trans­former and slowly increase the AC sup­ply while monitoring the current, if it
draws too much current (Be ware fuse
is rated for 1.0 amps), then turn off
supply and do repair method #1.

NO

Check whether the primary rectifying
DC of the Switching power supply has
an output. (Reading should be about
168V.)

YES

With the primary DC working check
the secondary 5V.

YES

Are the 40V, 12V, -30V, 5V, 15V and
filaments lines higher than normal?

NO

Although the secondary 5V is working,
are any of the other voltages higher
than normal (40V, 12V, -30V, 15V and
filament voltages)?

NO

There is no problem on the SW power
supply.

YES

NO

NO

YES

YES

#1

#2

#3

#4

#5

Repair method #1

(Power must be off)
Short circuit in the secondary side. check diode D013

and {(FIP display model only: D012, D014, D015, D016
and D017) or (LED display model only: D014, D015 and
D016)}, switching FET (Q001), control transistor
(Q002), diode (D006), and resistor (R014) replace as
necessary.

Disconnect 40V diode (D013), 15V diode (D014), 12V
diode (D015),
5V diode (D016) and {FIP display model only: -30V
diode (D012) and filament voltage diode (D017)}Check
the load continuity of 40V line, 15V line, 12V line, 5V
line, -30V line and filament voltage line through a tester
(resistance range).

If the tester indicates a lower resistance value around 0
ohm, the line is short-circuited.

Before repairing the switching power supply, find out the
short-circuited area of such line and repair it.

If the tester does not indicate any low resistance value
(around 0 ohm), no load is short-circuited and there is
no problem.

2] Check for any defective parts while the secondary
rectifying diodes are disconnected (D013, D014, D015,
D016 and {FIP display model only: D012 and D017)}
perform a diode check in both forward and reverse
directions through a tester.

3] Remove the following components and check for
defects: snubber diode (D051), switching FET (Q001),
source resistor (R014), control transistor (Q002).

Repair method #2

Check the fuse 1.0A (F001), primary rectifying diodes
(D001-D004) as possible problems. Remove the above
mentioned parts and check them. The circuit which turns
on switching FET (Q001) may be regarded as a possible
cause, even if the load at the secondary side is shorted,
it can’t be detected because switching FET (Q001) isn’t
operating. Perform check according to the step 1 and 2
of repair method #1 and check the following parts:

(Remove the part from PCB)
Switching FET (Q001), source resistor (R014), gate

resistor (R008) and start resistor (R004 and R005).

Repair method #3

A circuit to turn on switching FET (Q001) may not work
and this may be regarded as a cause of trouble. Even
if the load at the secondary side is short-circuited, it
cannot be detected because switching FET (Q001)
does not turn on. Therefore, perform check according
to the steps 1] and 2] of the repair method #1 and
execute the under-mentioned parts breakage check.

(Remove the part from PCB.)
switching FET (Q001), source resistor (R014), control

transistor (Q002), gate resistor (R008) and start resistor
(R004 and R005).

Repair method #4

The feedback circuit which is monitored by the output of
voltage may not work and this may be regarded as a
possible cause, remove control transistor Q002 and
check for defects. More over, a photo coupler (IC001)
and transistor (Q031) may be defective, replace any
defective parts with factory originals.

Repair method #5

If the output voltage of the secondary side is slightly
high, the line load may be in the "OPEN" state and this
may be regarded as a cause of trouble. If there is no
output voltage on the secondary side, the rectifying
diodes (D013), (D014), (D015) and {FIP display model
only only: (D012) and (D017)} may be defective.

1-8-11

1-8-12

SCHEMATIC DIAGRAMS / CBA’S AND TEST POINTS

Standard Notes

Warning

Many electrical and mechanical parts in this chassis
have special characteristics. These characteristics
often pass unnoticed and the protection afforded by
them cannot necessarily be obtained by using replace­ment components rated for higher voltage, wattage, etc.
Replacement parts that have these special safety char­acteristics are identified in this manual and its supple­ments; electrical components having such features are
identified by the mark " #" in the schematic diagram
and the parts list. Before replacing any of these compo­nents, read the parts list in this manual carefully. The
use of substitute replacement parts that do not have the
same safety characteristics as specified in the parts list
may create shock, fire, or other hazards.

Capacitor Temperature Markings

Mark

Capacity

change rate

(B) ±10% 20°C -25~+85°C
(F) +30 -80% 20°C -25~+85°C

(SR) ±15% 20°C -25~+85°C

(Z) +30 -80% 20°C -10~+70°C

Standard

temperature

Temperature

range

Note:

1.Do not use the part number shown on these draw­ings for ordering. The correct part number is shown
in the parts list, and may be slightly different or
amended since these drawings were prepared.

2.All voltages are DC voltages unless otherwise speci­fied.

Values in schematic diagrams

The values, dielectric strength ( power capacitance )
and tolerances of the resistors ( excluding variable
resistors ) and capacitors are indicated in the schematic
diagrams using abbreviations.

[ Resistors ]

Item Indication

Value

Power

capacitance

No indication...........................Ω

K............................................kΩ

M..........................................MΩ

No indication............1/4W,1/6W

All capacitances other than the
above are indicated in schematic
diagrams.

Capacitors and transistors are represented by the fol­lowing symbols.

CBA Symbols

(Top View) (Bottom View)

(Bottom View)

E C B

(Top View)

E C B

(Top View)

E C B

Schematic Diagram Symbols

+

Electrolytic Capacitor

Transistor or Digital Transistor

(Top View)

NPN
Transistor

NPN Digital
Transistor

Digital Transistor

E C B

(Top View)

E C B

PNP
Transistor

PNP Digital
Transistor

[ Capacitors ]

Item Indication

Value

No indication...........................µF

P..............................................pF

No indication...........................50V

Dielectric

strength

All dielectric strengths other than
50V are indicated in schematic
diagrams.

[ Coils ]

Item Indication

Value

µ...............................................µH

m.............................................mH

1-9-1

LIST OF CAUTION, NOTES, AND SYMBOLS USED IN THE SCHEMATIC DIAGRAMS ON THE FOLLOWING
PAGES:

1. CAUTION:

FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME

F

A V

TYPE FUSE.
ATTENTION: POUR UNE PROTECTION CONTINUE LES RISQES D’INCELE N’UTILISER QUE
DES FUSIBLE DE MEMO TYPE.
RISK OF FIRE-REPLACE FUSE AS MARKED.

This symbol means fast operating fuse.

2. CAUTION:

Ce symbole represente un fusible a fusion rapide.

Fixed Voltage (or Auto voltage selectable) power supply circuit is used in this unit.
If Main Fuse (F001) is blown, first check to see that all components in the power supply circuit are not defective
before you connect the AC plug to the AC power supply. Otherwise it may cause some components in the power
supply circuit to fail.

3. Note:

(1)Do not use the part number shown on the drawings for ordering. The correct part number is shown in the parts

list, and may be slightly different or amended since the drawings were prepared.

(2)To maintain original function and reliability of repaired units, use only original replacement parts which are listed

with their part numbers in the parts list section of the service manual.

4. Wire Connectors
(1)Prefix symbol "CN" means "connector" (can disconnect and reconnect).
(2)Prefix symbol "CL" means "wire-solder holes of the PCB" (wire is soldered directly).

5. Note: Mark "•" is a leadless (chip) component.

6. Mode: SP

7. Voltage indications for PLAY mode on the schematics are as shown below:

PLAY mode

5.0

231

5.0

Indicates that the voltage
is not consistent here.

8. How to read converged lines

1-D3
Distinction Area

Line Number
(1 to 3 digits)

Examples:

1. "1-D3" means that line number "1" goes to area "D3".

2. "1-B1" means that line number "1" goes to area "B1".

3

AREA D3

2

1

1-D3

ABCD

Unit: Volts

1-B1

AREA B1

9. Test Point Information

: Indicates a test point with a jumper wire across a hole in the PCB.
: Used to indicate a test point with a component lead on foil side.
: Used to indicate a test point with no test pin.
: Used to indicate a test point with a test pin.

1-9-2

Main 1/4 Schematic Diagram

PWR.

VCR PM

REC

1-9-3 1-9-4 1-9-5

Main 2/4 Schematic Diagram

1-9-6 1-9-7 1-9-8

Main 3/4 Schematic Diagram

CAUTION !

Fixed voltage power supply circuit is used in this unit.
If Main Fuse (F001) is blown, check to see that all components in the power supply
circuit are not defective before you connect the AC plug to the AC power supply.
Otherwise it may cause some components in the power supply circuit to fail.

F

A V

CAUTION

FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,
REPLACE ONLY WITH THE SAME TYPE FUSE.
ATTENTION : POUR UNE PROTECTION CONTINUE LES RISQES
D'INCELE N'UTILISER QUE DES FUSIBLE DE MEMO TYPE.
RISK OF FIRE-REPLACE FUSE AS MARKED.

"This symbol means fast operating fuse."
"Ce symbole reprèsente un fusible à fusion rapide."

NOTE :
The voltage for parts in hot circuit is measured using
hot GND as a common terminal.

1-9-9 1-9-10

Main 4/4 Schematic Diagram

1-9-11

1-9-12

Function Schematic Diagram

1-9-13

1-9-14

Function CBA Top View

Function CBA Bottom View

1-9-15 1-9-16

Main CBA Top View

CAUTION !

Fixed voltage power supply circuit is used in this unit.
If Main Fuse (F001) is blown, check to see that all components in the power supply circuit
are not defective before you connect the AC plug to the AC power supply.
Otherwise it may cause some components in the power supply circuit to fail.

TP752
A-OUT

TP751

V-OUT

WF1

F

A V

CAUTION

FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,
REPLACE ONLY WITH THE SAME TYPE FUSE.
ATTENTION : POUR UNE PROTECTION CONTINUE LES RISQES
D'INCELE N'UTILISER QUE DES FUSIBLE DE MEMO TYPE.
RISK OF FIRE-REPLACE FUSE AS MARKED.

"This symbol means fast operating fuse."
"Ce symbole reprèsente un fusible à fusion rapide."

BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER
SUPPLY CIRCUIT , AN ISOLATION TRANSFORMER MUST BE USED.
ALSO , IN ORDER TO HAVE THE ABILITY TO INCREASE THE INPUT
SLOWLY , WHEN TROUBLESHOOTING THIS TYPE POWER SUPPLY
CIRCUIT , A VARIABLE ISOLATION TRANSFORMER IS REQUIRED.

NOTE :
The voltage for parts in hot circuit is measured using
hot GND as a common terminal.

TP301
C-PB

WF5

VR501
SW-P

TP303

CTL

TP302
RF-SW

WF2

TP510

LD-SW

TP502

S-INH

1-9-17

1-9-18

1-9-19

Main CBA Bottom View

CAUTION !

Fixed voltage power supply circuit is used in this unit.
If Main Fuse (F001) is blown, check to see that all components in the power supply circuit
are not defective before you connect the AC plug to the AC power supply.
Otherwise it may cause some components in the power supply circuit to fail.

F

A V

CAUTION

FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,
REPLACE ONLY WITH THE SAME TYPE FUSE.
ATTENTION : POUR UNE PROTECTION CONTINUE LES RISQES
D'INCELE N'UTILISER QUE DES FUSIBLE DE MEMO TYPE.
RISK OF FIRE-REPLACE FUSE AS MARKED.

"This symbol means fast operating fuse."
"Ce symbole reprèsente un fusible à fusion rapide."

BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER
SUPPLY CIRCUIT , AN ISOLATION TRANSFORMER MUST BE USED.
ALSO , IN ORDER TO HAVE THE ABILITY TO INCREASE THE INPUT
SLOWLY , WHEN TROUBLESHOOTING THIS TYPE POWER SUPPLY
CIRCUIT , A VARIABLE ISOLATION TRANSFORMER IS REQUIRED.

NOTE :
The voltage for parts in hot circuit is measured using
hot GND as a common terminal.

1-9-20 1-9-21 1-9-22

WIRING DIAGRAM

CYLINDER ASSEMBLY

CN502

D-W1

FRONT

VIDEOINAUDIO

IN (R)

AUDIO
IN (L)

VIDEO
IN

AUDIO
IN (R)

AUDIO
IN (L)

REAR

VIDEO
OUT

AUDIO
OUT (R)

AUDIO
OUT (L)

ANT-IN ANT-OUT

AC CORD

MAIN CBA

CN501CN504CN251 CN503

CN507

2

1

GND

KEY 1

2

3

CN651

3

KEY 2
1

PG-IN5

D-U3

D-COM

D-V2

4

V-COM

V(R)-1
1

2

V(L)-1

V(L)-2

3

4

V-COM5

V(R)-26

Hi-Fi-A(R)7

Hi-Fi-COM

Hi-Fi-A(L)9

8

LD-M(+)1

LD-M(-)
2

AE-H/FE-H5

A-COM6

A-PB/REC7

CTL(+)8

CTL(-)

GND3

AE-H
4

FE-H1

FE-H GND2

9

1 C-F/R

C-FG

AL+15.5V/+12V

P-ON+5V
2

C-POW-SW5

3

4

FG-GND

C-CONT
6

7

CM-GND8

DRUM
MOTOR

PG
SENSOR

VIDEO
(R)1
HEAD

VIDEO
(L)1
HEAD

VIDEO
(L)2
HEAD

VIDEO
(R)2
HEAD

Hi-Fi AUDIO
(R) HEAD

Hi-Fi AUDIO
(L) HEAD

M

LOADING MOTOR ASSEMBLY

LOADING
MOTOR

M

AC HEAD ASSEMBLY

CN287

AUDIO

ERASE HEAD

AUDIO HEAD

CONTROL HEAD

AE-H

AE-H/FE-H

A-COM

A-PB/REC

CTL(+)

CTL(-)

CAPSTAN MOTOR

C-F/R

P-ON+5V

AL+15.5V/+12V

C-FG

C-POW-SW

C-CONT
FG-GND

CM-GND

1
2
3
4
5
6

FE HEAD

FULL
ERASE HEAD

FUNCTION CBA

DECK ASSEMBLY

1-10-1 1-10-2

SYSTEM CONTROL TIMING CHARTS

Mode SW : LD-SW

LD-SW Position detection

A/D Input voltage Limit

(Calculated voltage)

3.76V~4.50V
(4.12V)

4.51V~5.00V
(5.00V)

0.00V~0.25V
(0.00V)

1.06V~1.50V
(1.21V)

0.66V~1.05V
(0.91V)

1.99V~2.60V
(2.17V)

1.51V~1.98V
(1.80V)

3.20V~3.75V
(3.40V)

0.26V~0.65V
(0.44V)

4.51V~5.00V
(5.00V)

2.61V~3.19V
(2.97V)

Symbol

EJ

CL

SB

TL

FB

SF

AU

AL

SS

GC

RS

13 RF-SW

F-AD
(Internal Signal)

5 C-DRIVE

37 PB CTL

The first rise of RF-SW after a rise in F-AD signal

AT

"L" "L"

"H"

Acceleration Detection (T1)

"Z"

ST

"H"

Stop detection (T2)

Slow Tracking Value

Note:

EJ RS : Loading FWD (LM-FWD "H", LM-REV "L")
RS EJ : Loading REV (LM-FWD "L", LM-REV "H")
Stop (A) = Loading
Stop (B) = Unloading

Note :

Symbol Loading Status

EJ Eject
CL Eject ~ REW Reel

SB REW Reel ~ Stop(B)

TL Stop(B) ~ Brake Cancel
FB Brake Cancel
SF ~ Stop(A)

AU Stop(A) ~ Play / REC

AL Play / REC ~ Still / Slow
SS Still / Slow ~ Capstan Reversal
GC Capstan Reversal ~ RS (REW Search)
RS RS (REW Search)

10 C-F/R

11 H-A-SW

12 ROTA

BL

Reversal Limit Value

1-11-1

STILL FRAME ADVANCE STILL

Fig.1

1-11-2

13 RF-SW

F-AD
(Internal Signal)

The first rise of RF-SW after a rise in F-AD signal

AT

5 C-DRIVE

37 PB CTL

10 C-F/R

"H"

"L" "L"

Acceleration Detection (T1)

"Z"

ST

"H"

BL

Stop detection (T2)

Slow Tracking Value

Reversal Limit Value

11 H-A-SW

12 ROTA

STILL STILL

FRAME ADVANCE

Fig.2

1-11-3

LM-FWD "M"

/REV

59

EJ

AL

RS

SF

AU

TL

FB

SS

SB

62 D-REC-H

2 TV/VCR

DISPLAY

61 D-PB-L

13 A-MUTE-H

C-DRIVE

48 C-F/R

DRUM

RO TATIO N

60 P-ON

74 LD-SW

CL/GC

PIN NO.

1. EJECT (POWER OFF) -> CASSETTE IN (POWER ON) -> STOP(B) -> STOP(A) -> PLAY -> RS -> FS -> PLAY -> STILL -> PLAY -> STOP(A)

POWER

-OFF

STOP

PLAY RS

FS

STILL(SLOW)PLAY STOPPLAY

0.1S

VCR

0.8S

0.2S

2.5S

0.2S

1.0S

0.5S

0.3S

ON

ON

0.2S

CHART Fig. 1, 2.

"Z"

0.2S

1.2S

0.2S

0.4S

0.2S

0.1S

Refer to STILL/

SLOW TIMING

FB

AU AU

AU

SS

GC
AL

AL AU

EJECT

CLEJ SB TL SB

CASS.LOAD

LD-FWD

0.2S
LD-REV

0.7S

LD-FWD

TL

0.2S
LD-REV

0.2S
LD-FWD

0.5S
LD-REV

STOP(A)

LD-FWD

PLAY

LD-FWD

GC

0.4S
LD-FWD

RS AL AL AL SFSS

RS

SS

LD-REV

AU AUSF FB SF SF ALAL

0.2S
LD-FWD

FS

PLAY

LD-FWD

STILL(SLOW)

LD-REV

0.2S
LD-FWD

ST-S,/
END-S
"OFF"

PLAY

REW

FF

PLAY

PAUSE
(SLOW)

PLAY

0.2S

1.2S

0.4S

Fig.3

1-11-4

0.3S

PLAY

LD-REV

STOP(A)

STOP
/EJECT

LM-FWD "M"

/REV

59

EJ

AL

RS

SF

AU

TL

FB

SS

SB

62 D-REC-H

2 TV/VCR

DISPLAY

61 D-PB-L

13 A-MUTE-H

C-DRIVE

48 C-F/R

DRUM

ROTATION

60 P-ON

74 LD-SW

CL/GC

PIN NO.

2. STOP(A) -> FF -> STOP(A) -> REW -> STOP(A) -> REC -> PAUSE -> PAUSE or REC -> STOP(A) -> EJECT

STOP

STOPFF

REW STOP

REC

RECREC PAUSE STOP

VCR

1.0S

1.2S

ON

ON

"Z"

0.2S

0.4S

0.2S

0.4S

0.2S

FB

FB

AU AU

AU FB FB AU

SS

GC

AL

SS

GC AL AU

SF FBTL AL

STOP(A)
LD-REV

0.2S
LD-FWD

FF
LD-REV

1.0S

SF SF

LD-FWD

0.5S

LD-REV

STOP(A)

TL

LD-REV

0.2S
LD-FWD

SF SF SF AUAL ALFBSF

REW
LD-REV

1.0S

LD-FWD

0.5S

LD-REV

STOP(A)

LD-FWD

REC

GC

LD-FWD

0.2S

2.0S Short REV

SS

LD-REV

AU AU

0.2S
LD-FWD
REC PAUSE

REC

GCRS AL AL SF FB TL SB CL EJRS SS

LD-FWD

0.2S

1.3S

LD-REV

FF

STOP
/EJECT

REW

STOP
/EJECT

REC

PAUSE

REC or
PAUSE

STOP
/EJECT

0.4S

0.1S

Fig.4

1-11-5

0.2S
LD-FWD

0.5S

LD-REV

STOP(A)

LD-REV

0.2S
LD-REV

0.5S

0.2S

0.5S

CASS. UNLD

EJECT

STOP
/EJECT

ST-S,/
END-S
"ON"

IC PIN FUNCTION

IC501 ( SERVO / SYSTEM CONTROL IC )

"H" ≥ 4.5V, "L" ≤ 1.0V

Pin

IN/

No.

OUT

1IN

2 OUT TV/VCR

3 – N.U. Not Used –
4 – N.U. Not Used –
5 – N.U. Not Used –
6 – N.U. Not Used –

7OUT

8 OUT HiFi-CS HiFi IC Chip Select H

IN/

9

OUT

10 OUT

11 OUT HiFi-CLK

12 OUT

13 OUT A-MUTE

14 IN

15 OUT C-ROTA

16 OUT H-A-SW

17 OUT RF-SW

18 OUT

19 OUT

20 OUT

21 IN C-SYNC

22 – GND GND –
23 – N.U. Not Used –
24 – OSDVss OSDVss –

Signal

Name

REMO
CON-IN

INSEL/
ST-SL

2

C BUS-

I
DATA

2

I

C BUS-

CLK

HiFi­DATA

H-A­COMP

HiFi-H-SWHiFi Audio Head

REC-CTL
(+)

REC-CTL
(-)

Function

Remote Control
Sensor

RF Conv. ON/OFF
Signal (TV="L"/
VCR="H")

Input Selector
Control Signal
(EE/Rec)/
Still/Slow (Playback)

I2C BUS Data
Input/Output

I2C BUS Clock
Output

HiFi IC Control
Clock Output

HiFi IC Control
Data Output

Audio Mute Control
Signal (Mute="H")

Head Amp
Comparator Signal

Color Phase Rotary
Changeover Signal

Video Head Amp
Switching Pulse

Video Head
Switching Pulse

Switching Pulse
Record Control

Signal (+)
Record Control

Signal (-)
Composite

Synchronized Pulse

Active

Level

L

H/L

H/Hi-z

/L

H/L

H/L

H/L

H/L

H

H/L

H/L

H/L

H/L

H/L

H/L

H/L

PULSE

Pin

IN/

No.

OUT

25 IN

26 IN

27 IN V-HOLD

28 – HLF

29 – GND GND –

30 OUT

31 OUT

32 – OSDVcc OSDVcc –

33 OUT

34 IN RESET

35 IN OSC

36 OUT OSC

37 – Vcc Vcc –

38 IN X

39 OUT Xout Main Clock Output –
40 – Vss Vss(GND) –
41 IN XC IN Sub Clock 32 kHz –
42 OUT XC OUT Sub Clock 32 kHz –
43 IN CLKSEL Clock Select (GND) L
44 – N.U. Not Used –

45 OUT

46 OUT

47 OUT

Signal

Name

REC-SAF

-SW

C-VIDEO

-IN

OSD-BB­OUT

OSD­CHARA­OUT

D-V
SYNC­OUT

IN

OUT

IN

SP/LP
/SLP

C-POW

-SW

TRICK/
C-G/APC

Function

Recording Safety
SW Detect (With
Record tab="L"/
With out Record
tab="H")

Composite Video
Signal Input (Slicer)

Condenser
Connected Terminal
(Slicer)

LPF Connected
Terminal (Slicer)

Composite Video
Signal Output
(Blue Back)

Character Output
(Superimposed)

Dummy V-sync
Output

System Reset
Signal (Reset= "L")

Clock Input for
letter size

Clock Output for
letter size

Main Clock Input

14.31818 MHz

Tape Speed Select
Signal (SP="L"/
LP="Z"/SLP="H")

Capstan Power
Control

Special Playback
/Copy Guard/APC
Control Signal

Active

Level

H/Hi-z

H/Z/L

H/Z/L

H/L

–

–

–

–

–

L

–

–

–

H/L

1-12-1

Pin

IN/

No.

OUT

48 OUT C-F/R

49 IN T-REEL

50 IN S-REEL

51 IN C-FG

52 IN D-FG

53 IN D-PG

54 IN PB-CTL

55 OUT C-CONT

56 OUT D-CONT

57 – N.U. Not Used –
58 – N.U. Not Used –

59 OUT

60 OUT P-ON-L

61 OUT D-PB

62 OUT D-REC

63 IN

64 – N.U. Not Used –

65 IN

66 OUT

67 IN

68 IN END-S

69 IN AFC

70 IN V-ENV

Signal

Name

LM-FWD/
REV

P-DOWN

-L

HiFi/NOR

-IN
BLUE

BACK­ON

ST/SAP­IN

Function

Capstan Motor
FWD/REV Control
Signal (FWD="L"/
REV="H")

Take Up Reel
Rotation Signal

Supply Reel
Rotation Signal

Capstan Motor
Rotation Detection
Pulse

Drum Motor
Rotation Detection
Pulse

Drum Motor Pulse
Generator

Playback Control
Signal

Capstan Motor
Control Signal

Drum Motor Control
Signal

Loading Motor
FWD/REV Output

Power On Signal to
Low

Playback
Instruction Signal
(Playback="L")

Delayed Record
Signal

Power Voltage
Down Detector
Signal

Audio Mode Input
HiFi="L"/Normal="H"

Blueback Control
Signal

Tuner Stereo/Sap
Detector Signal
Input

Tape End Position
Detect Signal

Automatic
Frequency Control
Signal

Video Envelope
Comparator Signal

Active

Level

H/L

PULSE

PULSE

PULSE

PULSE

PULSE

PULSE

PWM

PWM

H/Z/L

H/L

A/D

A/D

A/D

A/D

Pin

IN/

No.

OUT

71 IN

72 IN KEY-1 A/D Key Data Signal A/D
73 IN KEY-2 A/D Key Data Signal A/D

74 IN LD-SW

75 IN ST-S

76 – AVcc

77 – FLDVcc FLDVcc –
78 – N.U. Not Used –
79 – N.U. Not Used –
80 – N.U. Not Used –
81 OUT G1 Display Digit H/L
82 OUT G2 Display Digit H/L
83 OUT G3 Display Digit H/L
84 OUT G4 Display Digit H/L
85 OUT a Display Segment H/L
86 OUT b Display Segment H/L

L

L

H

L

H

87 OUT c Display Segment H/L
88 OUT d Display Segment H/L
89 OUT f Display Segment H/L
90 OUT g Display Segment H/L
91 OUT h Display Segment H/L
92 OUT i Display Segment H/L
93 OUT j Display Segment H/L
94 OUT e Display Segment H/L
95 – N.U. Not Used –
96 – N.U. Not Used –
97 – N.U. Not Used –
98 – N.U. Not Used –
99 – N.U. Not Used –
100 – N.U. Not Used –

Notes:

Abbreviation for Active Level:

PWM ---------------------- Pulse Wide Modulation
A/D ------------------------ Analog - Digital Converter

Signal

Name

PG­DELAY

Function

Video Head
Switching Pulse
Signal Adjusted
Voltage

Deck Mode Position
Detect Signal

Tape Start Position
Detect Signal

A/D Converter
Power Input/
Standard Voltage
Input

Active

Level

A/D

A/D

A/D

–

1-12-2

LEAD IDENTIFICATIONS

BN1F4M-T
BA1F4M-T
KTA1266(GR)
KTC3193(Y)
KTC3199(Y,GR,BL)
2SC2785(J.H.F.K)
2SC2058(Q)
KRA103M
KRC103M
DTC124ESA
2SA1015-GR(TPE2)

E C B

2SC536NF(NG)-NPA-AT

DTA124ESA

LTV-817(B.C)-F

A

K

E C B

2SC1815-Y(TPE2)
2SC1815-GR(TPE2)
2SC3331(T,U)
2SC2120-Y(TPE2)
KTC3203(Y)
2SC1815-BL(TPE2)
2SC2001(K,L)

81

C

E

LA71091M
QSZAA0RMB019

80

13

14

BD6655FP

6

7

19

20

1

25

51

50

E C B

ST-304L-(A,B,C,D)

E C

PT204-6B-12

E C

2SK2599

S D G

100

80

61

31

1

LA72653M

60

1

30

41

20

Note:

A: Anode
K: Cathode
E: Emitter
C: Collector
B: Base
R: Reference
S:

Source

G: Gate
D: Drain

40

21

1-13-1

DECK MECHANISM SECTION

VIDEO CASSETTE RECORDER

VT-FX685A

VT-FX685AC

DECK MECHANISM SECTION

● Standard Maintenance

● Mechanical Alignment Procedures

● Disassembly/Assembly of Mechanism

● Alignment for Mechanism

TABLE OF CONTENTS

Standard Maintenance....................................................................................................................................... 2-1-1

Fixture and Tape for Adjustment ........................................................................................................................ 2-2-1

Mechanical Alignment Procedures .................................................................................................................... 2-3-1

Disassembly / Assembly Procedures of Deck Mechanism ................................................................................ 2-4-1

Alignment Procedures of Mechanism ................................................................................................................ 2-4-9

STANDARD MAINTENANCE

Service Schedule of Components

h: Hours ❍: Check ●: Change

Deck Periodic Service Schedule

Ref. No. Part Name 1,000 h 2,000 h 3,000 h 4,000 h

B2 Cylinder Assembly ❍●❍●
B3 Loading Motor Assembly ●

B8 Pulley Assembly ●●
B27 Tension Lever Sub Assembly ●●
B31 AC Head Assembly ●

B573, B574 Reel (S), Reel (T) ●

B37 Capstan Motor ●●
B52 Cap Belt ●●

*B73 FE Head ●
B133 Idler Assembly ●●
B410 Pinch Arm (A) Assembly ●●
B414 M Brake S Assembly ●●
B416 M Brake T Assembly ●●
B525 LDG Belt ●●

Notes:

1. Clean all parts for the tape transport (Upper Drum with Video Head / Pinch Roller / Audio Control Head / Full
Erase Head) using 90% Isopropyl Alcohol.

2. After cleaning the parts, do all DECK ADJUSTMENTS.

3. For the reference numbers listed above, refer to Deck Exploded Views.

* B73 ------ VCR Model only

2-1-1

Cleaning

Cleaning of Video Head

Clean the head with a head cleaning stick or chamois
cloth.

Procedure

1.Remove the top cabinet.

2. Put on a glove (thin type) to avoid touching the upper
and lower drum with your bare hand.

3.Put a few drops of 90% Isopropyl alcohol on the
head cleaning stick or on the chamois cloth and, by
slightly pressing it against the head tip, turn the
upper drum to the right and to the left.

Notes:

1.The video head surface is made of very hard mate­rial, but since it is very thin, avoid cleaning it verti­cally.

2.Wait for the cleaned part to dry thoroughly before
operating the unit.

3.Do not reuse a stained head cleaning stick or a
stained chamois cloth.

Cleaning of Audio Control Head

Clean the head with a cotton swab.

Procedure

1.Remove the top cabinet.

2.Dip the cotton swab in 90% isopropyl alcohol and
clean the audio control head. Be careful not to
damage the upper drum and other tape running
parts.

Notes:

1.Avoid cleaning the audio control head vertically.

2.Wait for the cleaned part to dry thoroughly before
operating the unit or damage may occur.

A/C Head

Upper
Cylinder

Do Not !

Video Head

Cleaning Stick

2-1-2

FIXTURE AND TAPE FOR ADJUSTMENT

1. Alignment Tape
No. 7099046 (MH-1)

2. Special Driver
No. 7099028

How To Use The Fixtures And Tape

Item No. Name Part No. How to used

1 Alignment Tape 7099046

2 Special Driver 7099028

● Head Switching Point

● Tape Interchangeability Alignment

● Guide Roller

2-2-1

MECHANICAL ALIGNMENT PROCEDURES

Explanation of alignment for the tape to correctly run
starts on the next page. Refer to the information below
on this page if a tape gets stuck, for example, in the
mechanism due to some electrical trouble of the unit.

Service Information

A. Method for Manual Tape Loading/Unloading

To load a cassette tape manually:

1. Disconnect the AC plug.

2. Remove the Top Case and Front Assembly.

3. Insert a cassette tape. Though the tape will not be
automatically loaded, make sure that the cassette
tape is all the way in at the inlet of the Cassette
Holder. To confirm this, lightly push the cassette
tape further in and see if the tape comes back out,
by a spring motion, just as much as you have
pushed in.

4. Turn the LDG Belt in the appropriate direction
shown in Fig. M1 for a minute or two to complete
this task.

To unload a cassette tape manually:

1. Disconnect the AC plug.

2. Remove the Top Case and Front Assembly.

3. Make sure that the Moving guide preparations are
in the Eject Position.

4. Turn the LDG Belt in the appropriate direction
shown in Fig. M1 until the Moving guide prepara­tions come to the Eject Position. Stop turning
when the preparations begin clicking or can not
be moved further. However, the tape will be left
wound around the cylinder.

5. Turn the LDG Belt in the appropriate direction con­tinuously, and the cassette tape will be ejected.
Allow a minute or two to complete this task.

B. Method to place the Cassette Holder in the tape-

loaded position without a cassette tape

1. Disconnect the AC Plug.

2. Remove the Top Case and Front Assembly.

3. Turn the LDG Belt in the appropriate direction
shown in Fig. M1. Release the locking tabs
shown in Fig. M1 and continue turning the LDG
Belt until the Cassette Holder comes to the tape­loaded position. Allow a minute or two to com­plete this task.

Top View

Moving guide T preparation
(Eject Position)

Moving guide S preparation
(Eject Position)

Push the tape
to load it.

Push the locking tab gently to unlock
when loading without a cassette.

UNLOAD
/EJECT

LOAD

Side View

LDG Belt

Fig. M1

Bottom View

2-3-1

LDG Belt (B)

UNLOAD
/EJECT

Cam Gear

Fig. M2

1. Tape Interchangeability Alignment

Note:
To do these alignment procedures, make sure that the

Tracking Control Circuit is set to the center position
every time a tape is loaded or unloaded. (Refer to page
2-3-4, procedure 1-C, step 2.)

Equipment required:

Dual Trace Oscilloscope
VHS Alignment Tape (MH-1)
Guide Roller Adj. Screwdriver
X-Value Adj. Screwdriver

Note: Before starting this Mechanical Alignment, do all
Electrical Adjustment procedures.

Flowchart of Alignment for tape traveling

Loading (Use a blank tape.)

Adjust the height of the Guide Rollers
(Supply side and take-up side).
(Use a blank tape.) (pg. 2-3-3)

1-A

Check to see that the tape is not creasing
and that there is no slack on the supply
and take-up side Guide Rollers.
(Use a blank tape.)

Adjust the X Value for maximum envelope.
(pg. 2-3-3) (Use Alignment Tape.)

Adjust the envelope. (pg. 2-3-4)

Check the envelope.

OK

Adjust the Audio Section.
(Azimuth Alignment) (pg. 2-3-4)

Check the audio output.

OK

Check the following:

1. X Value (pg. 2-3-3)

2. Envelope (pg. 2-3-4)

OK

1-A

1-B

1-C

1-C

1-D

1-D

1-B, 1-C

Not good

Not good

Not good

Not good

Do the final tape-traveling test to see that
the tape runs normally in play mode with­out creasing or slacking.

OK

Completion

Adjust the X value and envelope.

1-B, 1-C

1-A

2-3-2

1-A. Preliminary/Final Checking and Alignment of Tape Path

Purpose:

To make sure that the tape path is well stabilized.

Symptom of Misalignment:

If the tape path is unstable, the tape will be damaged.
Note: Do not use an Alignment Tape for this procedure.

If the unit is not correctly aligned, the tape may be
damaged.

1. Play back 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.)
Note: Beneath each Guide Roller, there is a
small screw. (Refer to Fig. M5.) This screw works

Guide Roller [2]

Guide Roller [3]

to apply adequate torque to the shaft of each
Guide Roller so that the Guide Roller turns prop­erly. Even when adjusting the height of the Guide
Roller(s), do not touch these two small screws.

3. Check to see that the tape runs without creasing at
Take-up Guide Post [4] or without snaking be­tween Guide Roller [3] and AC Head.
(Fig. M3 and M5)

4. If creasing or snaking is apparent, adjust the Tilt
Adj. Screw of the AC Head. (Fig. M6)

Azimuth Adj. Screw

AC Head

X-Value Adj.
Screwdriver

Tilt Adj. Screw

Fig. M6

A

Take-up Guide Post [4]

Lead Surface of Cylinder

Correct

Guide Roller

Tape

Small Screw

Take-up Guide

Tape

Post

AC Head

1-B. X Value Alignment

Purpose:

B

Fig. M3

Tape

Fig. M4

Incorrect

To align the Horizontal Position of the Audio/Con­trol/Erase Head.

Symptom of Misalignment:

If the Horizontal Position of the Audio/Control/Erase
Head is not properly aligned, maximum envelope can­not be obtained at the Neutral position of the Tracking
Control Circuit.

1. Connect the oscilloscope to TP301 (C-PB) and
TP303 (CTL) on the Main CBA. Use TP302 (RF­SW) as a trigger.

2. Play back the Gray Scale of the Alignment Tape
(MH-1) and confirm that the PB FM signal is pre­sent.

3. Set the Tracking Control Circuit to the center posi­tion by pressing the CH UP button then the PLAY
button on the VCR. (Refer to note on bottom of
page 2-3-4.)

4. Use the X-Value Adj. Screwdriver so that the PB FM
signal at TP301 (C-PB) is maximum. (Fig. M6)

5. Press CH UP button on the VCR until the CTL wave­form has shifted by approx. +2ms. Make sure
that the envelope is simply attenuated (shrinks in
height) during this process so that you will know
the envelope has been at its peak.

Fig. M5

2-3-3

6. Press CH DOWN button on the VCR until the CTL
waveform has shifted from its original position (not
the position achieved in step 5, but the position of
CTL waveform in step 4) by approximately

-2ms. Make sure that the envelope is simply at­tenuated (shrinks in height) once CTL waveform
passes its original position and is further brought
in the minus direction.

7. Set the Tracking Control Circuit to the center posi­tion by pressing the CH UP button and then the
PLAY button on the VCR.

1-C. Checking/Adjustment of Envelope Waveform

Purpose:

To achieve a satisfactory picture and precise tracking.

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.

1. Connect the oscilloscope to TP301 (C-PB) on the
Main CBA. Use TP302 (RF-SW) as a trigger.

2. Play back the Gray Scale on the Alignment Tape
(MH-1). Set the Tracking Control Circuit to the
center position by pressing the CH UP and then
the PLAY button on the VCR. 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. Screwdriver.

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.

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 center position. The number of
pushes UP to achieve 1/2 level of envelope should
match the number of pushes DOWN from center. If
required, redo the "X Value Alignment."

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.

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.

1. Connect the oscilloscope to the audio output jack
on the rear side of the deck.

2. Play back the alignment tape (MH-1) and confirm
that the audio signal output level is 8 kHz.

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)

Dropping envelope level at the beginning of track.

Fig. M7

Dropping envelope level at the end of track.

Fig. M8

Envelope is adjusted properly. (No envelope drop)

Fig. M9

2-3-4

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 on page 1-6-1.)

All the following procedures, including those for adjustment and replacement of parts, should be done in Eject mode;
see the positions of [48] and [49] in Fig. DM1 on page 2-4-3. When reassembling, follow the steps in reverse order.

STEP

/LOC.

START-

No.

[1] [1] Top Plate T DM3 2(S-1), *2(L-1)
[2] [1] Cassette Holder Assembly T DM4 (S-19)
[3] [2] Slider L T DM5 (S-2)
[4] [2] Slider R T DM5 (S-3)
[5] [4] Lock Lever T DM5 (S-4), *(P-1)
[6] [2] Cassette Plate T DM5

[7] [7] Cylinder Assembly T DM1, DM6

[8] [8] Loading Motor Assembly T DM1, DM7

[9] [1] Tape Guide Assembly T DM1, DM8 *(P-2), (C-8)
[10] [1] Door Opener B T DM1, DM8 (S-8), *(L-2)
[11] [10] Pinch Arm (B) Assembly T DM1, DM8 *(P-3)
[12] [11] Pinch Arm (A) Assembly T DM1, DM8
[13] [13] FE Head T DM1, DM9 (S-9)
[14] [14] First Post Assembly T DM1, DM9 (S-10)
[15] [15] Prism T DM1, DM9 (S-11)
[16] [16] Standard Post T DM1, DM9 *(L-4)
[17] [1] Slider Shaft T DM10 (S-12), *(L-7)
[18] [17] C Drive Lever L T DM10
[19] [17] C Drive Lever R T DM10
[20] [1] Capstan Motor B DM2, DM11 3(S-14), Cap Belt
[21] [21] FF Arm Holder B DM2, DM12 (S-15)
[22] [22] Clutch Assembly B DM2, DM12 (C-1)
[23] [22] Center Gear B DM12
[24] [24] Cam Holder B DM2, DM13 (C-2)
[25] [24] F Brake Assembly B DM2, DM13
[26] [26] Cam Gear (B) B DM2, DM13 (C-3), *(P-4)
[27] [27] Mode Gear B DM2, DM14 (C-4)
[28] [27] Mode Lever B DM2, DM14 (C-5)
[29] [29] Worm Holder B DM2, DM14 (S-16)
[30] [30] Pully Assembly B DM2, DM14
[31] [29] Cam Gear (A) B DM2, DM14

ING

No.

PART

Fig. No.

REMOVAL INSTALLATION

REMOVE/*UNHOOK/
UNLOCK/RELEASE/
UNPLUG/DESOLDER

3(S-5),
Connector A,
Connector B

2(S-6), (S-7), LDG
Belt, ACH Connector
AN(9P) and 9B

ADJUSTMENT

CONDITION

2-4-1

STEP
/LOC.
No.

START­ING
No.

[32] [28] TR Gear C B DM2, DM14 (C-6)
[33] [32] TR Gear Spring B DM14
[34] [33] TR Gear A/B B DM1, DM14
[35] [34] FF Arm HI T DM1, DM14
[36] [28] Sensor Gear B DM1, DM15 (C-7)
[37] [28] Idler Assembly B DM1, DM15
[38] [28] BT Arm B DM2, DM15 *(P-5)

[39] [28] Loading Arm S Assembly B DM2, DM15

[40] [39] Loading Arm T Assembly B DM2, DM15

[41] [28] M Brake T Assembly T DM1, DM16 *(P-6)
[42] [28] M Brake S Assembly T DM1, DM16 *(P-7)

[43] [42]

[44] [43] T Lever Holder T DM1, DM16 *(L-5)
[45] [2] M Gear T DM1, DM16 (C-10)
[46] [41] Reel T T DM1, DM16
[47] [44] Reel S T DM1, DM16

[48] [47]

[49] [40]

[50] [20] TG Post Assembly T DM1, DM17 *(L-3)

[51] [31] Rack Assembly R DM18

[52] [51] F Door Opener A R DM18 *(P-9)
[53] [53] Cleaner Lever Assembly T DM1,DM6
[54] [53] CL Post T DM1,DM6 *(L-6)

↓

➀

➁

Tension Lever Sub
Assembly

Moving Guide S
Preparation

Moving Guide T
Preparation

↓

PART

↓

➂

Fig. No.

T DM1, DM16

T DM1, DM17

T DM1, DM17

↓

➃

↓

➄

REMOVAL INSTALLATION

REMOVE/*UNHOOK/
UNLOCK/RELEASE/
UNPLUG/DESOLDER

(C-9)

(S-17), Slide Holder S

(S-18), Slide Holder T

➅

ADJUSTMENT

CONDITION

(+) Refer to Alignment
Sec. Pg. 2-4-9

(+) Refer to Alignment
Sec. Pg. 2-4-9

(+) Refer to Alignment
Sec. Pg. 2-4-10

↓

↓

➆

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.

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).
7 : Adjustment Information for Installation

(+): Refer to Deck Exploded Views for lubrication.

2-4-2

Top View

[13]

[14]

[43]

[16] [49][48] [50]

[7] [53] [54] [8]

[12]

[10]

[15]

[44]

[42]

Bottom View

[25]

[20]

[37][47] [36] [45] [46]

[35][34]

[9]
[11]

[41]

Fig. DM1

[40]

[39]

[29]

[30]

[24]
[26]
[31]

[32] [38][22]

2-4-3

[27]

[28]

[21]

Fig. DM2

(S-1)

(L-1)

[1]

[3]

[4]

(S-1)

(L-1)

[5]

(S-2)

[6]

Pin C

Pin D

[2]

Pin A

2

Pull up

Fig. DM3

A

1

Slide

Pin B

Slot A

[7]

Connector

(S-3)

(S-4)

(P-1)

Fig. DM5

Connector

[53]

[54]

(L-6)

Slots

First, while pushing the locking tab as
shown in the right, slide and pull up the right
side on [2] to release Pin A and Pin B from
the slots A.
Then, remove Pin C and Pin D on [2] from
the slots B as shown.

Locking tab

(S-19)

Slot A

View for A

Fig. DM4

(S-5)

Fig. DM6

2-4-4

ACH Connector
9B (9P)

(S-7)

FFC Cable

ACH Connector
AN (9P)

[8]

(S-10)

[14]

[13]

(S-9)

(S-11)

[15]

[16]

(L-4)

(S-6)

[12]

(S-8)

(L-2)

LDG
Belt

Fig. DM7

Fig. DM9

[10]

[18]

(P-3)

[11]

[9]

A

Adj.
Screw

(P-2)

(L-7)

After removing the Screw (S-12),
while pressing the Locking Tab
(L-7), remove [17].

[17]

[19]

Pin of [11]

View for A

Pin of [9]

[31]

(C-8)

Grooves of [31]

When reassembling [9]
and [11], confirm that pin of
[9] and pin of [11] are in the
grooves of [31] as shown.

Fig. DM8

(S-12)

Fig. DM10

2-4-5

Cap Belt

[20]

[26]

(P-4)

(C-3)

(C-2)

[24]

[25]

(P-4)

[21]

(S-15)

(S-14)

(C-1)

[23]

[22]

Fig. DM11

Pin on
bottom
of [26]

[31]

When installing [26], install
the spring (P-4) to [31] as
shown in the left figure, and
then install [26] while
pressing the spring (P-4) to
the direction of the arrow in
the left figure and confriming
that the position of the
spring (P-4) is placed as
shown in the left figure.

[26]

Top View

Pin on [24]

Pin on [25]

Fig. DM12

[31]

Position of pins on [24] and [25]

Fig. DM13

2-4-6

[28]

(C-5)

Refer to the Alignment Section, Page 2-4-9.

(P-5)

[38]

[35]

[30]

[31]

(S-16)

[29]

(C-6)

[33]

[32]

[34]

(C-4)

[27]

[37]

(C-7)

[36]

[43]

[40]

[39]

Fig. DM15

Position of Mode Lever when installed

Pin of [41]

Bottom View

[31]

Top View

Pin of [38]

Align [28] and [31] as shown.

First groove on [31]

First tooth on [51]

[31]

When reassembling [31],
meet the first groove on
[31] to the first tooth on
[51] as shown.

Pin of [42]

[28]

[42]

(P-7)

turn

[44]

(L-5)

turn

(C-9)

[47]

(C-10)

[45]

[46]

[41]

turn

Fig. DM16

(P-6)

Fig. DM14

2-4-7

[48]

Slide Holder S

[49]

(L-3)

[50]

(S-17)

(P-9)

[52]

Slide Holder T

(S-18)

Fig. DM17

[51]

Slide

Fig. DM18

2-4-8

ALIGNMENT PROCEDURES OF MECHANISM

The following procedures describe how to align the
individual gears and levers that make up the tape load­ing/unloading mechanism. Since information about the
state of the mechanism is provided to the System Con­trol Circuit only through the Mode Switch, it is essential
that the correct relationship between individual gears
and levers be maintained.

All alignments are to be performed with the mecha­nism in Eject mode, in the sequence given. Each

procedure assumes that all previous procedures have
been completed.

IMPORTANT:

If any one of these alignments is not performed

properly, even if off by only one tooth, the unit will

unload or stop and it may result in damage to the

mechanical or electrical parts.

Alignment points in Eject Position

Top View

Alignment [a]

Alignment 3

Alignment 1

Loading Arm, S and T Assembly

Install Loading Arm S and T Assembly so that their

triangle marks point to each other as shown in
Fig. AL2.

Alignment 2

Mode Gear

Keeping the two triangles pointing at each other, in-

stall the Loading Arm T Assembly so that the last
tooth of the gear meets the most inside teeth of
the Mode Gear. See Fig. AL2.

Alignment 1

Triangle Marks

Loading Arm
T Assembly

Loading Arm
S Assembly

Last Tooth

Alignment 2

Most inside teeth
of Mode Gear

Mode Gear

Bottom View

Alignment [a] can be done independently of any
other alignment.

Alignment 1

Alignment 2

Fig. AL1

Fig. AL2

Alignment [a]

Tape Guide Assembly

Measurement of the screw must be as specified in
Fig. AL3.

Tape Guide
Assembly

Screw

3.25 – 0.1 mm

0.128 – 0.004 inch

This alignment can be
done independently of
any other alignment.

2-4-9

Fig. AL3

Alignment 3

Cam Gear (A), Rack Assembly

Install the Rack Assembly so that the first tooth on

the gear of the Rack Assembly meets the first

groove on the Cam Gear (A) as shown in Fig.

AL4.

Top View

First groove
on the Cam Gear (A)

Cam Gear (A)

Alignment 3

First tooth

Gear on Rack Assembly

Fig. AL4

2-4-10

EXPLODED VIEWS AND

PARTS LIST SECTION

VIDEO CASSETTE RECORDER

VT-FX685A

VT-FX685AC

EXPLODED VIEWS AND PARTS LIST SECTION

● Exploded views

● Parts List

TABLE OF CONTENTS

Exploded Views ................................................................................................................................................... 3-1-1

Mechanical Parts List........................................................................................................................................... 3-2-1

Electrical Parts List .............................................................................................................................................. 3-3-1

Front Panel

EXPLODED VIEWS

A1X

3-1-1

Cabinet

A2

2L011

2L011

See Electrical Parts List
for parts with this mark.

Some Ref. Numbers are
not in sequence.

2L023

2B5

2L023

2L011

2B43

2B44

2B3

2B8

2B46

A5

2B34

2B24

MAIN CBA

2L021

2L022

2B45

2B3

2L021

2L021

2L021

2L021

FUNCTION CBA

3-1-2

AC001

Deck Mechanism View 1

B2

B402

B401

Mark Description

Floil G-374G

(Blue grease)

B9

B523

B11

L1463

B12

L1191

B73

B576

L1482

B10

L1482

L1053

B577

B74

L1051

B411

B567

L1471

B410

L1450

B494

B426

B560

B121

B126

B35

B122

L1460
B552

B550

Chassis Assembly
Top View (Grease Point)

B501

L1466

B510

B571

Some Ref. Numbers are not in sequence.

B492

B37

B8

Chassis Assembly
Bottom View (Grease Point)

3-1-3

Deck Mechanism View 2

B27

B508

B573

B414

B499

B487

B556

B564

B574

B518

B521

B520

Mark Description

Floil G-374G

L1406

B148

B522

(Blue grease)

B3

B524 (Motor
PCB Ass’y)

B558

B512

B566

L1469

B417

B568

B578

B579

B582

B580

B133

B581

B559

B551

B583

B584

B572

B507

B569

B565

B86

B488

B416

B505

B491

B570

B502

B513

B31

B404

L1151

B557

B403

B525

Bottom Side
(Grease point)

B516

B52

Some Ref. Numbers are not in sequence.

Bottom Side (Grease point)

3-1-4

Deck Mechanism View 3

L1321

B347

L1321

Mark Description

Floil G-374G

B472

(Blue grease)

B562

B355

L1341

B482

B563

L1341

B319

L1461

B354

B483

B425

B300

B313

L1483

B529

B360

B359

B361

Some Ref. Numbers are not in sequence.

B555

B561

B303

B514

3-1-5

MECHANICAL PARTS LIST

SYMBOL-NO P-NO DESCRIPTION

MECHANISM SECTION

2B3 TJ13885 HOLDER, SENSOR
2B5 TJ15107 SHIELD, CYLINDER
2B8 TJ15122 BUSH, LED

2B24 TJ15123 SHIELD, BOTTOM
2B34 TJ15124 SHIELD, HEAD
2B43 TJ15108 ARM, REC
2B44 TJ15109 SPRING, ARM
2B45 TJ15111 SPACER

2B46 TJ15314 ROHM HOLDER
2L011 TE13193 SCREW(3X10)
2L021 TJ10119 SCREW(3X10)
2L022 TJ15112 SCREW(3X12)
2L023 TJ14063 SCREW(M2.6X4)

A1X TJ15271 PANEL, FRONT
A2 TJ15102 COVER, TOP
A5 TJ14088 BOARD, JACK
AC001 TJ15125 CORD, AC

!

B2 TJ15148 CYLINDER ASSY

B3 TJ15149 MOTOR, LOADING
B8 TJ15151 PULLEY ASSY
B9 TJ15152 GUIDE, MOVING(S)
B10 TJ15153 GUIDE, MOVING(T)
B11 TJ15154 ARM, LOADING(T)

SYMBOL-NO P-NO DESCRIPTION

B402 TJ15177 CONNECTOR
B403 TJ13984 CONNECTOR
B404 TJ15178 CONNECTOR
B410 TJ15179 ARM, PINCH
B411 TJ15181 SPRING, PINCH

B414 TJ15289 BRAKE(S)
B416 TJ15291 BRAKE(T)
B417 TJ15184 SPRING, TENSION
B425 TJ15185 SPRING, LOCK LEVER
B426 TJ15186 PULLEY KICK

B472 TJ15187 SLIDER(R)
B482 TJ15188 PLATE, CASSETTE
B483 TJ15292 LEVER, LOCK
B487 TJ15293 BRAKE, BAND
B488 TJ15294 LEVER, MODE

B491 TJ15295 GEAR, CAM(A)
B492 TJ15296 GEAR.MODE
B494 TJ15195 OPENER, DOOR
B499 TJ15196 HOLDER, LEVER(T)
B501 TJ15197 HOLDER, WORM

B502 TJ15297 GEAR, CAM(B)
B505 TJ10229 WASHER
B507 TJ14034 WASHER
B508 TJ15298 SPRING, BRAKE(S)
B510 TJ10229 WASHER

B12 TJ15155 ARM, LOADING(S)
B27 TJ15156 LEVER, TENSION
B31 TJ15286 HEAD, AC
B35 TJ15158 GUIDE, TAPE
B37 TJ15287 MOTOR, CAPSTAN

B52 TJ15161 BEL T, CAP
B73 TJ15162 HEAD, FE
B74 TJ15163 PRISM
B86 TJ15164 BRAKE(F)
B121 TJ15165 WORM

B122 TJ15166 SHAFT, WORM
B126 TJ15167 PULLEY
B133 TJ15288 IDLER ASSY
B148 TE12612 TG CAP
B300 TJ15169 LEVER, DRIVE

B303 TJ15171 OPENER, FOOR
B313 TJ15172 SPRING, DRIVE
B319 TJ13969 SPRING
B347 TJ15173 HOLDER, GUIDE
B354 TJ15174 SLIDER(R)

B355 TJ15175 SLODER(L)
B359 TJ15103 LEVER, CLEANER
B360 TJ15104 ROLLER, CLEANER
B361 TJ15105 POST
B401 TJ15176 CONNECTOR

B512 TJ14034 WASHER
B513 TJ15201 WASHER
B514 TJ15202 SCREW, RACK
B516 TJ14034 WASHER
B518 TJ15203 WASHER

B520 TJ15299 SPRING, BRAKE(T)
B521 TJ15205 SPRING, SOFT
B522 TJ15206 POST ASSY
B523 TJ14038 POST
B524 TJ15207 PWB ASSY MOTOR

B525 TJ15208 BELT, LDG
B529 TJ15106 CLEANER ASSY
B550 TJ15209 GUIDE, TAPE
B551 TJ15301 ARM, FF
B552 TJ15212 SPRING, ADJUST

B555 TJ15213 RACK ASSY
B556 TJ15214 POST, STANDARD
B557 TJ15215 PULLEY , MOTOR
B558 TJ15216 MOTOR, LOADING
B559 TJ15302 CLUTCH ASSY

B560 TJ15303 SPRING, KICK
B561 TJ15219 SPRING, DOOR
B562 TJ15221 LEVER, DRIVE
B563 TJ15222 SHAFT, SLIDER
B564 TJ15223 GEAR(M)

3-2-1

SYMBOL-NO P-NO DESCRIPTION

B565 TJ15224 GEAR, SENSOR
B566 TJ15225 HOLDER, ARM
B567 TJ15226 ARM, PINCH(B)
B568 TJ15304 ARM(BT)
B569 TJ15305 HOLDER, CAM

B570 TJ15229 SPRING, CAM RACK
B571 TJ10229 WASHER
B572 TJ15203 WASHER
B573 TJ15231 REEL(S)
B574 TJ15232 REEL(T)

B576 TJ15233 HOLDER, SLIDE(S)
B577 TJ15234 HOLDER, SLIDE(T)
L1051 TJ14055 SCREW(M2.6X6)
L1053 TJ15313 SCREW(M2.6X8)
L1151 TJ15236 SCREW(M2.6X4)

L1191 TJ15313 SCREW(M2.6X8)
L1321 TJ10176 SCREW (3X6)
L1341 TE13298 SCREW , M2.6X6
L1406 TJ15238 HEAD, AC
L1450 TE12971 SCREW M2.6X5

L1460 TJ15239 SCREW(M2.6X6)
L1461 TJ14061 SCREW(M2.6X6)
L1463 TJ14063 SCREW(M2.6X4)
L1466 TJ14066 SCREW(M2.6X6)
L1469 TJ13452 SCREW(M2.6X6)

SYMBOL-NO P-NO DESCRIPTION

L1471 TJ14066 SCREW(M2.6X6)
L1482 TJ15241 SCREW(M2.3X4)
L1483 TJ15242 SCREW(M2.6X8)
L1484 TE13054 SCREW PRISM

ACCESSORIES

X1 TJ15274 REMOTE HAND SET
X3 TJ15117 CABLE, RF

3-2-2

ELECTRICAL PARTS LIST

Note: Although some parts in the schematic diagrams have different names from those in the parts list, there is no

problem in replacing parts.

SYMBOL-NO P-NO DESCRIPTION

RESISTOR

VR501 TJ13934 CARBON FILM

SEMI-CONDUCTORS

D001 TC10752 DIODE 1A5
D002 TC10752 DIODE 1A5
D003 TC10752 DIODE 1A5
D004 TC10752 DIODE 1A5
D006 TC10112 DIODE 1N4148M

D013 TC10791 RECTIFIER DIODE BA157
D014 TJ15128 DIODE FR202
D015 TJ15128 DIODE FR202
D016 TC10877 DIODE SB140
D018 TC10604 ZENER DIODE UZ-9.1BSC

D026 TC10607 ZENER DIODE UZ-33BSD
D027 TC10112 DIODE 1N4148M
D028 TC10112 DIODE 1N4148M
D029 TC10112 DIODE 1N4148M
D031 TJ13895 ZENER DIODE MTZJT-775.6B

D051 TE13211 DIODE BA158
D052 TJ13919 ZENER DIODE NTZJT-771.B
D054 TJ15129 DIODE RL151
D055 TC10112 DIODE 1N4148M
D057 TJ13896 ZENER DIODE MTZJT-775.1C

SYMBOL-NO P-NO DESCRIPTION

Q056 TJ15283 TRANSISTOR 2SC2001
Q060 TJ13923 TRANSISTOR KRA103M
Q061 TJ15315 TRANSISTOR 2SB892S
Q062 TJ13923 TRANSISTOR KRA103M
Q301 TC10784 TRANSISTOR KTA1266

Q302 TC10783 TRANSISTOR KTC3193
Q303 TC10783 TRANSISTOR KTC3193
Q391 TC10784 TRANSISTOR KTA1266
Q421 TC10784 TRANSISTOR KTA1266
Q422 TE13235 TRANSISTOR KTC3203Y

Q423 TJ13924 TRANSISTOR 2SC536NF
Q424 TJ13924 TRANSISTOR 2SC536NF
Q425 TJ13923 TRANSISTOR KRA103M
Q501 TE13243 TRANSISTOR KTC3199(BL)
Q503 TJ13925 TRANSISTOR ST-304L-A

Q504 TJ13925 TRANSISTOR ST-304L-A
Q506 TJ15141 TRANSISTOR PT204-6B-12
Q645 TC10783 TRANSISTOR KTC3193
Q646 TC10783 TRANSISTOR KTC3193
Q647 TC10783 TRANSISTOR KTC3193

Q648 TC10783 TRANSISTOR KTC3193

TRANSFORMER

! T001 TJ15285 TRANSFORMER

D060 TC10752 DIODE 1A5
D301 TC10112 DIODE 1N4148M
D302 TC10112 DIODE 1N4148M
D303 TC10112 DIODE 1N4148M
D501 TC10112 DIODE 1N4148M

D502 TC10112 DIODE 1N4148M
D555 TJ13898 LED
D701 TC10607 ZENER DIODE UZ-33BSD

! IC001 TE13224 IC LTV-817B-F

IC301 TJ15132 IC LA71091M

IC451 TJ15133 IC LA72653M
IC501 TJ15279 IC M37765MAA1L5GP
IC505 TJ15281 IC BR24C01AF-W
IC506 TJ15135 IC BD6655FP

! Q001 TJ13922 TRANSISTOR 2SK2599

Q002 TE13243 TRANSISTOR KTC3199(BL)
Q029 TE13243 TRANSISTOR KTC3199(BL)
Q031 TC10778 TRANSISTOR KTC3199
Q052 TJ13923 TRANSISTOR BN1F4M
Q055 TJ13924 TRANSISTOR 2SC536NF

COILS

! L001 TJ15243 FILTER, LINE

L006 TJ13909 COIL 47UH
L009 TJ13909 COIL 47UH

L301 TA12561 COIL 100UH
L303 TJ15137 INDUCTOR 220UH
L304 TJ13909 COIL
L421 TJ13915 COIL
L422 5121289 COIL 22UH

L501 TA12561 COIL 100UH
L502 TA12561 COIL 100UH
L581 TJ13909 COIL
L701A TJ13909 COIL 47UH
L851 TJ15138 INDUCTOR 1.8UH

L852 TA12562 COIL 12UH

CRYSTALS

X301 TJ15145 CRYSTAL

3-3-1

SYMBOL-NO P-NO DESCRIPTION

X502 TJ15146 CRYSTAL

MISCELLANEOUS

CN251 TJ13892 CONNECTOR

CN501 TJ13456 CONNECTOR
CN502 TJ15126 CONNECTOR
CN503 TJ15127 CONNECTOR
CN504 TJ13892 CONNECTOR
CN651 TJ15147 CONNECTOR

! F001 TE13223 FUSE 1A/250V

FH001 TE11084 HOLDER
FH002 TE11084 HOLDER
FIP502 TJ15131 DISPLAY, LED

! GP002 TJ13894 GAP

JK751 TJ14089 JACK
JK752 TJ14091 JACK
JK753 TJ15136 JACK
JK754 TJ13907 JACK
JK755 TJ14092 JACK

PS502 TJ15282 PHOTO INTERRUPTER
RS501 TJ15284 REMOTE RECEIVER

! SA001 TC10891 SURGE ABSORBER ENC471D-10AC

SW501 TE11957 SWITCH
SW502 TE11957 SWITCH

SYMBOL-NO P-NO DESCRIPTION

SW505 TE11957 SWITCH
SW506 TE11161 SWITCH
SW507 TJ15142 SWITCH, MODE
SW671 TE11957 SWITCH
SW672 TE11957 SWITCH

SW673 TE11957 SWITCH
SW674 TE11957 SWITCH
SW676 TE11957 SWITCH
SW701 TE11942 SWITCH
TU701 TJ15144 TUNER UNIT

3-3-2

VT-FX685A/FX685AC

VT-FX685A
VT-FX685AC

VT-FX685A/FX685AC

No. 5102ETK

Digital Media Products Division, Tokai