Philips VR540 Service Manual

Video Cassette Recorder

Service
Service

VR540/02/07/16

Service

Service Manual

Contents

Chapter

Adjustment Procedure

Sec. 1:

Schematic Diagrams and CBA's
Exploded Views
Mechanical and Electrical Parts Lists

Survey of versions:

/02 PAL B/G, VPS/PDC
/07 PAL I, Ireland
/16 PAL B/G, Spain
/39 SECAM L,L' & PAL B/G, I
/58 PAL/SECAM B/G, D/K

Sec. 2:

Standard Maintenance
Mechanism Alignment Procedures
Disassembly / Assembly of Mechanism
Deck Exploded Views

Safety regulations require that the set be restored to its original
condition and that parts which are identical with those specified
be used.

Published by BK 2003 Video Service Department Printed in Japan c Copyright reserved Subject to modification GB 3103 785 22140

MAIN SECTION

VIDEO CASSETTE RECORDER

Sec. 1: Main Section

I Adjustment Procedures
I Schematic Diagrams and CBA’s
I Exploded Views
I Mechanical and Electrical Parts List

TABLE OF CONTENTS

IMPORTANT SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1-1

STANDARD NOTES FOR SERVICING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2-1

FUNCTION INDICATOR SYMBOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3-1

PREPARATION FOR SERVICING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4-1

OPERATING CONTROLS AND FUNCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5-1

SIGNAL NAME ABBREVIATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6-1

CABINET DISASSEMBLY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7-1

ELECTRICAL ADJUSTMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8-1

BLOCK DIAGRAMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9-1

SCHEMATIC DIAGRAMS / CBA’S AND TEST POINTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10-1

WAVEFORMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11-1

WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12-1

SYSTEM CONTROL TIMING CHARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13-1

IC PIN FUNCTION DESCRIPTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14-1

LEAD IDENTIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15-1

ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16-1

EXPLODED VIEWS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-17-1

SET MECHANICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18-1

VR540CV

IMPORTANT SAFETY PRECAUTIONS

Product Safety Notice

Some electrical and mechanical parts have special
safety-related charac teristics 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 spe cial 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 Pro duct’s Safety is und er review con tin­uously and new instructions are issued whenever
appropriate. Prior to shipment from the factory, our
products are carefully inspected to confirm with the
recognized product s afety and electrical codes of the
countries in which they are to be sold. However, in
order to maintain such comp lianc e, it is equ ally impor ­tant 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 spur ious rad iation. T hese m ust also be
replaced only with specified re pla ce men ts.
Examples: RF converters, RF c ables, 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 wir es do n ot co ntact h eat pr od uc -

ing parts (heatsinks, oxide metal fil m re sisto rs, fus ­ible resistors, etc.).

G. Check that replaced wires do not contact sharp

edges or pointed parts.

H. When a power cord h as been repl aced, ch eck 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 obj ects (screw s, solder drop-

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

K. Crimp type wire connector

The power tr ansformer 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 th e complete clo­sure of the tool.

L. When connecting or disconnecting the internal con-

nectors, first, disco nnect the AC plug from th e AC
outlet.

1-1-1 SFTY_06

Safety Check after Servicing

1

B

Z

2

Examine the area surrounding the repaired location for
damage or deterio ration. 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 cleara nce distanc e (d) and (d’) between sol ­dered terminals, and between terminals and surround­ing metallic parts. (See Fig. 1)

T able 1 : Ratings for selected area

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

110 to 240 V

Note: This table is unofficial and for reference only.

Be sure to confirm the precise values.

≥ 3mm(d)

≥ 6 mm(d’)

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 acr oss the ter minals of l oad
Z. See Fig. 2 and the following table.

Chassis or Secondary Conductor

Primary Circuit Terminals

dd'

Fig.

Exposed Accessible Part

AC Voltmeter
(High Impedance)

One side of
Power Cord Plug Prongs

Fig.

T able 2: Leakage current ratings for selected areas

AC Line Voltage Load Z Leakage Current (i)

2kΩ RES.

Connected in

110 to 240 V

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

parallel

50kΩ RES.

Connected in

parallel

i≤0.7mA AC Peak

i≤2mA DC

i≤0.7mA AC Peak

i≤2mA DC

1-1-2 SFTY_06

One side of power cord plug

prongs (B) to:

RF or

Antenna terminals

A/V Input, Output

STANDARD NOTES FOR SERVICING

O

P

P

Circuit Board Indications

a. The output pin of the 3 pin Regulator ICs is indi-

cated as shown.

Top View

Input

ut

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

as shown.

In

in 1

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

shown.

in 1

Bottom View

5

10

How to Remove / Install Flat Pac k-IC

1. Removal

With Hot-Air Flat Pack-IC Desoldering Machine:.

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

machine, 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 glu e to the

CBA; when removing entire fl at pack-IC, fir st apply
soldering iron to center of the fla t pack-IC and hea t
up. Then remove (glue will be melted). (Fig. S-1-6)

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

zers. (Fig. S-1-6)

Instructions for Connectors

1. When you c onn ect o r di scon nec t the FF C (Fl exib le
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.

FFC Cable

Connector

CBA

* Be careful to avoid a short circuit.

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-I C on th e CB A i s a ffixed with g lue , so
be careful not to break or damage the foil of each
pin or the solder lands under the IC when removing
it.

Hot-air
Flat Pack-IC
Desoldering

CBA

Masking
Tape

Tweezers

Machine

Flat Pack-IC

Fig. S-1-2

1-2-1 NOTE_1

With Soldering Iron:

F

F
S

rp

or

n

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

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

lat Pack-IC

Desoldering Braid

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

CBA; when removing entire fl at pack-IC, fir st apply
soldering iron to center of the fla t pack-IC and hea t
up. Then remove (glue will be melted). (Fig. S-1-6)

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

zers. (Fig. S-1-6)

Note:

When using a sold ering iron, care must be taken
to ensure that the flat pack-IC is not being hel d by
glue. When the flat pack-IC is removed from the
CBA, handle it ge ntl y bec au se it may be damaged
if force is applied.

Soldering Iron

Hot Air Blower

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 sold er will
not adhere (iron wir e). When heating the pi ns , use
a fine tip soldering iron or a hot air desoldering
machine. (Fig. S-1-4)

Iron Wire

Soldering Iron

To Solid
Mounting Point

Fig. S-1-5

Sha
Pin

ine Tip
oldering Iron

Fig. S-1-4

CBA

Fine Tip
Soldering Iro

(3)B ottom of the flat pack- IC is fixed with g lue to the

CBA; when removing enti re flat pack-IC, fi rst apply
soldering iron to c en ter o f th e f lat pack-I C an d h eat
up. Then remove (glue will be melted). (Fig. S-1-6)

(4)R elease the fla t pack-IC from the CB A using twee -

zers. (Fig. S-1-6)

Tweezers

Flat Pack-IC

With Iron Wire:

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

Fig. S-1-6

pins of the flat pack-IC. Wh en you use solder flux
which is applied to all pins of the f lat 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 solde r
melts so as to lift the IC leads from the CBA contact
pads as shown in Fig. S-1-5

1-2-2 NOTE_1

2. Installation

P
i

d

(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 replac ement flat pack-IC more
easily.

(2)The “ I ” mark on the flat pack-IC indicates pin 1.

(See Fig. S-1-7.) Be sure this mar k matches the 1
on the PCB when position ing for installation. Then
presolder the four corne rs of th e fla t 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 :

in 1 of the Flat Pack-IC

s indicated by a " " mark.

Fig. S-1-7

Instructions for Handling
Semi-conductors

Electrostatic breakdown of the semi-conductors may
occur due to a po tential difference ca used by electr o­static charge during unpacking or repair work.

1. Ground for Human Body

Be sure to wear a gr oundin g band (1MΩ) that is prop­erly grounded to re move any static electricity th at may
be charged on the body.

2. Ground for Workbench

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

< Incorrect >

CBA

Presolder

Flat Pack-IC

Fig. S-1-8

CBA

< Correct >

Grounding Ban

1MΩ

CBA

1MΩ

Conductive Sheet or
Copper Plate

1-2-3 NOTE_1

FUNCTION INDICATOR SYMBOLS

Note:

The following symb ol s wil l appear on the indica tor panel to ind ic ate the c urre nt m ode or o per at ion of the VCR.
On-screen modes will also be momentarily displayed on the tv screen when you press the operation buttons.

Display panel

" H "= LED Light on, " L "= LED Light off

LED MODE INDICATOR ACTIVE

CASSETTE "IN"
CASSETTE "OUT"

CLOCK " 88:88 ON
POWER ON " PWR." ON
REC " REC " ON
REC PAUSE " REC " Blinks at 0.8Hz interval
T-REC,OTR

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

P-ON Power safety detection

" "
" "

" "

" "
" 1 "

" "
" 2 "

" "
" 3 "

" "
" 4 "

" "
" 5 "

ON
OFF

ON
(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

Blinks at 0.8Hz interval

S-INH condition All modes Blinks at 0.8Hz interval

1-3-1 HE470FIS

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 D eck Mechanis m Assembly and
press the PLAY button. The tape will be loaded into
the Deck Mechanism Ass embly. Make sure the power
is on, TP507 (SENSOR INHIBITION) to GND. This will
stop the function of Tape Start Sensor, Tape End Sen ­sor and Reel Sensors. (If these TPs are connected
before plugging in the unit, th e functi on of th e sens ors
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.

Q505

Q504

TP507

S-INH

Fig. 1

1-4-1 HE470PFS

1 2 3

4 5 6

7 8 9

P

0

P

P

STILL

STOP

MENU

REW FWD

PLAYSTATUS/EXIT CLEAR

VCR TV

REC STANDBY/ON

PROGVOL

INDEXMUTE SLOW SYSTEM

AUDIO

y

OPERATING CONTROLS AND FUNCTIONS

The remote control

Buttons for VCR feature only

VCR

To operate the VCR with the remote control.

CLEAR

(TIMER).

press repeatedly to start a One-Touch Recording.

During normal or slow motion playback, press to adjust the
tracking.

next

forward the tape at high speed. During playback, press to fast
forward the tape while the picture stay on the screen. To store or
confirm entry in the menu.

the tape at high speed. During playback, press to rewind the
tape while the picture stay on the screen.To return the cursor in
the menu.

PLAY
STOP

VCR.

To delete last entry/Clear programmed recording

REC

INDEX

To record the TV channel selected at this moment or

STILL

To stop the tape and slow a still picture.

+

PROG P–PROG P

In combination with

To select the programme number.

:to search for previous or

0 /1

recording on the cassette.

SLOW

To view the picture in slow motion.

AUDIO
SYSTEM
MENU
FWD

REW

To change stereo sound and 2nd language.

Doesn’t work in these models.

To call up main menu of VCR.

When tape playback is stopped, press to fast

-

When tape playback is stoped, press to rewind

-

K

To play a tape, select an item in the menu of VCR.

B-

C- L

To stop the tape, select an item in the menu of

Buttons with TV feature

TV

To call up additional TV functions.

y

STANDBY/ON

To switch VCR or Philips TV on or off, interrupt menu

function.

STATUS/EXIT

To access or remove the VCR’s on-screen status display.
To exit on-screen menus. Or, to access or remove a status display or menu
of Philips TV.

0..9

Press to select channels at VCR or Philips TV.

MUTE

To eliminate the TV’s sound. Press again to restore the volume.

VOL 5

VCR

–

To adjust the TV’s volume.

+

VOL

Press before pressing a VCR-feature key.
You can use this remote control to operate some func­tions of Philips TVs. Press before pressing a TV-

TV

feature key.

1-5-1 HE470IB

F

ront of the device

B

RF OUT

AV2 (DECODER) AV1 (TV)

AERIAL

FWDPLAYREWSTOP/EJECTRECORDPROGRAMMESTANDBY/ON

STANDBY/ON

motion playback, press to adjust the tracking.

RECORD

When tape playback is stopped, press to fast forward the tape at hight speed. During

FWD

playback, press to fast forward the tape while the picture stay on the screen.

When tape playback is stoped, press to rewind the tape at hight speed. During playback,

REW

press to rewind the tape while the picture stay on the screen.

PLAY

To play a tape.

STOP/EJECT

To switch off or on, interrupt a function.

PROGRAMME-PROGRAMME+

To record the TV channel selected at this moments.

To stop the tape and eject the cassette.

To select the programme number. During normal or slow

ack of the set

AV2(DECODER)

AV1(TV)
AERIAL
RF OUT

To connect the TV set(programme number).
To connect the aerial cable.
To connect the TV set.

To connect a satellite receiver, decoder, video recorder,etc.

1-5-2 HE470IB

SIGNAL NAME ABBREVIATIONS

Signal Name Function

8POUT-1

8POUT-2
A-COM Audio Head Common

A-IN 1, 2 Audio Signal Input 1, 2
A-MODE Hi-Fi Tape Detection Signal

A-MUTE-H
A-OUT 1, 2 Audio Signal Output 1, 2
A-PB/REC
AE-H Audio Erase Head
AFC
AGC IF AGC Control Signal
AL+15V/+12V

AL+20.5V

AL+44V

AL+5V

AL+9V
AMPC CTL AMP Connected Terminal

AMPVcc AMPVcc
AMPVREF

OUT
AMPVREF
AMPVss AMPVss (GND)

AVcc
C-CONT Capstan Motor Control Signal
C-F/R

C-FG
C-POWER-

SW
C-ROTA

SCART 1 8Pin Output Control
Signal

SCART 2 8Pin Output Control
Signal

Audio Mute Control Signal
(Mute = “H”)

Normal Audio Play Back/Record
Signal

Automatic Frequency Control
Signal

Always +15V/+12V with AC Plug
Connected

Always +9V with AC Plug
Connected

Always +9V with AC Plug
Connected

Always +5V with AC Plug
Connected

Always +9V with AC Plug
Connected

V-Ref for CTL AMP

IN V-Ref for CTL AMP

A/D Converter Power Input/
Standard Voltage Input

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

Capstan Motor Rotation Detection
Pulse

Capstan Power Switching Pulse
Color Phase Rotary Changeover

SIgnal

Signal Name Function

C-SYNC Composite Synchronized Pulse
CLKSEL Clock Select (GND)

SECAM or MESECAM Chroma

COLOR-IN

CTL (+)

CTL (-)
CTLAMPout To Monitor for CTL AMP Output

D-CONT Drum Motor Control Signal
D-FG
D-PG Drum Motor Pulse Generator

D-REC-H Delayed Record Signal
D-V- SYNC Dummy V-sync Output
DAVN-L VPS/PDC Data Receive = “L”
DRV-CLK LED Clock Driver IC Control Clock
DRV-DATA LED Clock Driver IC Control Data

DRV-STB
END-S Tape End Position Detect Signal

FE-H GND Ground for Full Erase He ad
FF/REW-L
FSC-IN

[4.43MHz ]
FTV-IN
H-A-COMP Head Amp Comparator Signal

H-A-SW Video Head Amp Switching Pulse
Hi-Fi-A (L) Hi-Fi Audio Head (L)
Hi-Fi-A (R) Hi-Fi Audio Head (R)
Hi-Fi-COM Hi-Fi Audio Head Common
HiFi-H-SW HiFi Audio Head Switching Pulse
HLF LPF Connected Terminal (Slicer)

2

C BUS- SCL I2C BUS Control Clock

I

2

I

C BUS- SDA I2C BUS Control Data

JK1-8P-OUT

Video Input Signal at Super
Impose

Playback/Record Control Signal
(+)

Playback/Record Control Signal (­)

Drum Motor Rotation Detection
Pulse

LED Clock Driver IC Chip Select
Signal

CTL Amp Gain Switching Signal
(FF/REW=”L”)

4.43MHz Clock Input
Comparator Input of Video Signal

for Follow TV

SCART 8Pin Output Control
Signal

1-6-1 HE470SNA

Signal Name Function

KEY-1 Key Scan Input Signal 1
KEY-2 Key Scan Input Signal 2

LD-SW

Deck Mode Position Detector

Signal
LINE MUTE Audio Mute Control Signal
LINK-IN Easy Link Data Input
LM-FWD/REV Loading Motor Control Signal
LP LP
MOD-A Modulator Audio Output Signal
N-A-PB Normal Audio Playback
N-A-REC Normal Audio Recording

IN Clock Input for letter size

OSC

OUT Clock Output for letter size

OSC
OSD-V-IN OSD Video Signal Input
OSD-V-OUT OSD Video Signal Output
OSDVcc OSDVcc
OSDVss OSDVss

P-DOWN-L

Power Voltage Down Detector

Signal
P-OFF-H Power Off at High
P-ON+15V +15V at Power-On Signal
P-ON+32V +32V at Power-On Signal
P-ON+44V +44V at Power-On Signal
P-ON+5V +5V at Power-On Signal

Signal Name Function

S-REEL

Supply Reel
Rotation Signal

SC2-IN Input Signal from Pin 8 of SCART2
ST-S

Tape Start Position Detector

Signal
T-REEL Take Up Reel Rotation Signal
TIMER+5V +5V at Timer

TRICK-H

Special Playback = “H” in SECAM

Mode
TU-AUDIO Tuner Audio Input Signal
TU-VIDEO Tuner Video Input Signal

V-ENV

Video Envelope Comparator

Signal
Vcc Vcc
VIDEO Video Signal
VIDEO-IN Video Signal Input
VIDEO-OUT Video Signal Output
V-IN 1, 2 Video Signal Input 1, 2
V-OUT 1, 2 Video Signal Output 1, 2
Vss Vss(GND)
X-IN Main Clock Input
X-OUT Main Clock Input
XC-IN Sub Clock
XC-OUT Sub Clock

P-ON+9V +9V at Power-On Signal
P-ON-H Power On Signal at High
P80/C P80/C Terminal

PG-DELAY

POW-SAF

Video Head Switching Pulse
Signal Adjusted Voltage

P-ON Power Detection Input
Signal

Recording Safety SW Detect (With

REC-SAF-SW

Record tab="L"/With out Record

tab="H")
REMOCON-IN Remote Control Sensor
RESET +5V +5V at System Reset Signal

RESET

System Reset

Signal (Reset=”L”)
RF-SW Video Head Switching Pulse
RGB-

THROUGH

SCART 2 RGB Through Control

Signal

1-6-2 HE470SNA

CABINET DISASSEMBLY INSTRUCTIONS

1. Disassembly Flowchart

This flowchart indicates the disassem bly 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] VCR Chassis Unit

[4] Jack CBA

[5] Deck Assembly

[6] Main CBA

[7] Cylinder Shield

2. Disassembly Method

REMOVAL

ID/

LOC.

No.

PART

REMOVE/*UNHOOK/

Fig.

UNLOCK/RELEASE/

No.

UNPLUG/DESOLDER

Note

(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,

unlocked, 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.”

Reference Notes

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

1. Remove five Screws (S-2), two Screws (S-3) and
Screw (S-4). Then, slowly lift the VCR Chassis Unit
(Deck Assembly, Jack CBA and Main CBA) up.

2. When reassembling, solder wire jumpers as shown
in Fig. 5.

3. Before installing the Deck Assembly, be sure to
place the pin of LD-SW on Main CBA as sho wn in
Fig. 6. 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. 6.

[1] Top Case 1 7(S-1) -

Front

[2]

Assembly
VCR

[3]

Chassis
Unit

[4] Jack CBA 4 Desolder, (S-5) -

Deck

[5]

Assembly

[6] Main CBA 5 --- ------- -

Cylinder

[7]

Shield

↓

(1)

↓

(2)

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

3 5(S-2), 2(S-3), (S-4), 1

5,6 2(S-6), Desolder 2,3

52(S-7) -

↓

(3)

↓

(4)

↓

(5)

1-7-1 HE470DC

(S-1)

)

(S-5)

[4] Jack CBA

Desolder

[1] T op Case

(S-1)

(S-1

Fig. 1

(S-2)

[3]VCR
Chassis Unit

(S-2)

(S-3)

(S-2)

(S-4)

(S-3)

(S-2)

(L-2)

[2] Front
Assembly

(L-1)

(L-2)

Fig. 3

Fig. 2

Fig. 4

1-7-2 HE470DC

[7] Cylinder Shield

FE Head

Cylinder Assembly

(S-7)

Pin

[5] Deck Assembly

From

From
FE Head

Cylinder
Assembly

(S-6)

TOP VIEW

From
AC Head
Assembly

AC Head
Assembly

[6] Main CBA

(S-6)

From
Capstan Motor
Assembly

Lead with
blue stripe

[6] Main CBA

[5] Deck Assembly

Shaft

Hole

LD-SW

SW507
LD-SW

Cam Gear

Hole

Pin

[6] Main CBA

Fig. 6

Printing

Lead with
blue stripe

Lead connections of Deck Assembly and Main CBA

Lead with
blue stripe

Desolder
from bottom

side

Fig. 5

1-7-3 HE470DC

ELECTRICAL ADJUSTMENT INSTRUCTIONS

e

2

)

C
C

c

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

NOTE:

1.Electrical adjus tments are required after replacing
circuit components a nd certain mechanical parts.
It is important to do these a djustments 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 tracki ng co ntrol is set in
the center position: P ress eith er "L 5??" or "K" button
on the remote control unit first, then the "PLAY"
button (Front Panel only).

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 (FL6A)

Head Switching Position Adjustment

Purpose:

To determine the Head Switching point during
playback.

Symptom of Misadjustment:

May cause Head Switching noise or ver tical jitter
in the picture.

Test point Adj.Point Mode Input

J23(V-OUT)

TP502(RF-SW)

GND

Tape

FL6A Oscilloscope

Connections of Measurement Equipment

Main CBA

VR501

(Switching Point)

(MAIN CBA)

Measurement

Equipment

J23

GND

TP502

PLAY

(SP)

6.5H±1H

(412.7µs±60µs)

Oscilloscop

-----

Spec.

CH1 CH
Trig. (+

Figure 1

EXT. Syncronize Trigger Point

V-Syn

H1
H2

Reference Notes:
Playback the Alignment tape and adjust VR501 so that
the V-sync front edg e 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.

1.0H

Switching Pulse

6.5H

0.5H

1-8-1 U27PCEUEA

Adjustment Points and Test Points

Main CBA Top View

1

TUNER
BLOCK

J23
V-OUT

Hi-Fi
BLOCK

AUDIO
BLOCK

VIDEO
BLOCK

POWER
SUPPLY
BLOCK

SYSCON/TIMER

TP502
RF-SW

VR501
SW-P

SERVO BLOCK

TEST POINT INFORMATION

: Indicates a test point with a jumper wire across a hole in the PCB.

TEST POINTS NOT USED IN ELECTRICAL ADJUSTMENTS

Test Point

TP301
TP502
TP501
TP507

Mechanical Alignment Procedures
Mechanical Alignment Procedures
Mechanical Alignment Procedures
Preparation for Servicing

Used in: Page No.

POWER
CTL
BLOCK

2-3-3, 2-3-4
2-3-3, 2-3-4

2-3-3
1-4-1

TP507
SENS-INH

TP301
C-PB

TP50

CTL

Audio In/Out,Video In/Out

Main CBA

Tuner Unit

Antenna In
Antenna Out

1-8-2 U27PCEUEA

Servo/System Control Block Diagram BLOCK DIAGRAMS

Q504

ST-S

SENSOR CBA

Q505

END-S

SENSOR CBA

(DECK ASSEMBLY)

AC HEAD ASSEMBLY

CONTROL
HEAD

CL287

5 5CTL(+)
6 6CTL(-)

CL504

" " = SMD

MAIN CBA

END-S

FROM
VIDEO
BLOCK

TU-VIDEO

V-IN1

NOTE FOR 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.)

SW507
LD-SW

Q503

T-REEL

P-ON+5V

AL+5V

PS503TP505

S-REEL

IC771

(COMPARATOR)

9
8

11
10

TIMER+5V

14

13

AL+5V

D502
S-LED

Q771,
Q772

RESET

P-ON+5V

AND

TEST POINT INFORMATION

RS501

REMOTE
SENSOR

Q501

4
5

: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.

2

IC501

(SERVO/SYSTEM CONTROL)

REMOCON-IN

14

LD-SW9

95

CTL(+)
CTL(-)

94
10

ST-S

4

END-S
T-REEL

80

S-REEL79

RESET

34

FTV-IN

64

KEY- 1

KEY- 2

DRV-DATA

DRV-STB
DRV-CLK

68
69
70

7

8

KEY
SWITCH

IC561

(FIP DRIVE)

DRV-DATA

28

DRV-STB

2

DRV-CLK

1

TP507

SENS-INH

KEY
SWITCH

S10

G1
G2
G3
G4

S1
S2

S7
S8
S9

23
22
21
20

13
14
16
17

FP562

LED CLOCK

7
8

TU701(TUNER UNIT)

SDA

3

SDA

12

SCL

5

SCL

11

IC503 (MEMORY)

CYLINDER ASSEMBLY CAPSTAN MOTOR

PG

DRUM
MOTOR

SENSOR

M

LOADING
MOTOR

M

CAPSTAN
MOTOR

M

VR501
SW-POINT

CL502

12 P-ON+15V
11

AL+12V(2)

10 GND

D-PG

9

D-CONT

8

LM-FWD/REV

7

GND

6

C-CONT

5

C-F/R

4

C-FG

3

P-ON+5V

2

AL+12V/+20.5V

1

AL+5V

FROM/TO
POWER
SUPPLY
BLOCK

AL+5V

SW506

REC-SAFETY

P-ON+15V
AL+12V

P-ON+5V
AL+12V/+20.5V

C-POW-SW
P-ON-H
P-DOWN-L

PG-DELAY

2

REC-SAF-SW

31

D-PG

90

D-CONT77
LM-FWD/REV

81

C-CONT

76

C-F/R

78

C-FG

87

C-POW-SW

66

P-ON-H

67

P-DOWN-L

86

A-MUTE-H

Hi-Fi-H-SW

A-MODE

LINE-MUTE

IIC-BUS SDA

IIC-BUS SCL

D-REC-H

RF-SW

C-ROTA

D-V SYNC

H-A-SW

H-A-COMP

V-ENV

C-SYNC

83

19
32
28

72
71
33
18
15
13
16

17

58

SDA

5

SCL

6

IIC-BUS SDA

IIC-BUS SCL

A-MUTE-H

IIC-BUS SDA

IIC-BUS SCL

Hi-Fi-H-SW

A-MODE

LINE-MUTE

IIC-BUS SDA

IIC-BUS SCL

D-REC-H

RF-SW

C-ROTA

D-V SYNC

H-A-SW

H-A-COMP

6

V-ENV

C-SYNC

TO
AUDIO BLOCK

FROM/TO
Hi-Fi AUDIO
BLOCK

FROM/TO
VIDEO BLOCK

1-9-1 1-9-2 HE470BLS

Video Block Diagram

V-OUT1

V-IN1

" " = SMD

SERVO/SYSTEM
CONTROL BLOCK

JACK CBA

JK101

Q101

19
20

BUFFER

MAIN CBA

TU701

TU-VIDEO

CL101

1

NOTE FOR 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.)

V-IN1TO
TU-VIDEO

VIDEO

6

24

V-OUT1

V-IN1

3 3

CL151

1

Q351

BUFFER

WF1

J23

V-OUT

IC501 (OSD)

OSD

52

CHARACTER
MIX

IC301

(Y/C SIGNAL PROCESS)

48
50
52

56

61
63

PB/EE

TUNER

IN1

PB/EE

MUTE

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.

50

COLOR

-IN

TUNER

IN1

IN2

FRT

IN2

FRT

MUTE

55

BYPASS

FROM
SERVO/SYSTEM
CONTROL BLOCK

IIC-BUS SDA
IIC-BUS SCL

65

Y. DELAY

AGC

CHARA.
INS.

1/2

FBC

Y/C
MIX

PR

AGC VXO

DECORDER

LUMINANCE
SIGNAL
PROCESS

CCD 1H DELAY

CHROMINANCE
SIGNAL
PROCESS

69684643

SERIAL

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

7978

R

P

SP

EP

SP
HEAD
AMP

96
95
93
94

90

Y

+

C

R P R P

REC FM
AGC

EP
HEAD
AMP

D-REC-H

C-ROTA/RF-SW

D-V-SYNC

H-A-SW

H-A-COMP

V-ENV

C-SYNC

89
88
87

80

70
62
71
83
84
67

WF1

TP502

RF-SW

CL253

V(R)-1

V-COM

V(L)-1

V(L)-2

V-COM

V(R)-2

D-REC-H

RF-SW

C-ROTA

D-V-SYNC

H-A-SW

H-A-COMP

V-ENV

C-SYNC

(DECK ASSEMBLY)

CYLINDER ASSEMBLY

1
2
3
4
5
6

FROM/TO SERVO/SYSTEM
CONTROL BLOCK

VIDEO (R)-1
HEAD

VIDEO (L)-1
HEAD

VIDEO (L)-2
HEAD

VIDEO (R)-2
HEAD

V-OUT2

V-IN2

JK102

19
20

Q102

BUFFER

CL102

1

V-OUT2

V-IN2 3

3

CL152

1

58 59

2928

X301

4.433619MHz

21

TP301

C-PB

WF2

1-9-3 1-9-4 HE470BLV

Audio Block Diagram

" " = SMD

TO Hi-Fi
AUDIO BLOCK

NOTE FOR 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.)

N-A-PB
N-A-REC

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.

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

MAIN CBA

IC301

(AUDIO SIGNAL PROCESS) 1513 17

(DECK ASSEMBLY)

ACE HEAD ASSEMBLY

AUDIO
HEAD

AUDIO
ERASE
HEAD

FE HEAD

FULL
ERASE
HEAD

CL287
A-PB/REC 4
A-COM 3
AE-H 1
AE-H/FE-H 2

CL504
4 A-PB/REC
3 A-COM
1 AE-H
2 AE-H/FE-H

CL501
2 AE-H/FE-H
1 FE-H-GND

Q401

Q402

BIAS
OSC

Q405
(PB=ON)

+5V

Q406

Q403

5
6

1
2

SWITCHING
D-REC-OFF

+5V

PB-ON

EQ
AMP

SP/LP-ON

AUTO
BIAS

R

REC
AMP

IN1

ALC
DET

ALC

P

LINE
AMP

REC-ON

DECODER

MUTE

SERIAL

12

11

TUNER IN2

INV

98

7

3

100

ATT

AUDIO HD-SW
CONTROL

16

68 69

71

A-MUTE-H
IIC-BUS SDA
IIC-BUS SCL

TO SERVO/SYSTEM
CONTROL BLOCK

1-9-5 1-9-6 HE470BLA

Hi-Fi Audio Block Diagram

" " = SMD

NOTE FOR 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.)

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.

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

A-IN1(R)
A-IN1(L)
A-OUT1(R)
A-OUT1(L)

A-IN2(R)
A-IN2(L)
A-OUT2(R)
A-OUT2(L)

JACK CBA

JK101

2
6
1
3

JK102

2
6
1
3

CL101

10

12

CL102

11

A-IN1(R)
A-IN1(L) 8

8
6

A-OUT1(R)
A-OUT1(L) 12

9

A-IN2(R)
A-IN2(L) 8

8
6

A-OUT2(R)
A-OUT2(L) 11

10

6

9

6

CL151

CL152

67
65

(Hi-Fi AUDIO SIGNAL PROCESS)

IC451

SW

SW

ALC

ALC

ALC

MAIN CBA

CN701 CN1

4

TU-AUDIO(R)
TU-AUDIO(L)

5

4
5

AFV CBA

IF SIGNAL
PROCESS

OUTPUT
SELECT

CN1

SIF

CN701

2

MUTE-ON

VCO MUTE

MUTE-ON

73
74

72

76
77
75

22

2

TU701

SIF

AUDIO

TO AUDIO BLOCK

N-A-REC
N-A-PB

52
56
54
50
60

10

78
80

62

70

61 71

47

R-CH
INSEL

2
6

L-CH

8
4

INSEL

+

48

14

15

ALC

R-CH
PNR

L-CH
PNR

P

R

R

P

SW
NOISE

LIM DEV

LIM DEV

SW
NOISE

DO
DET

R-CH
BPF

NOISE
DET

HOLD
PULSE

L-CH
BPF

COMP

VCO

LPF

MIX V/I

LPF

VCO

COMP

LIM

ENV
DET

LOGIC

LINE-MUTE

R

L

37
38

Q451

21
53

39

24

26

27

IIC-BUS SDA
IIC-BUS SCL

A-MODE

LINE-MUTE

Hi-Fi-H-SW

CL253

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

FROM/TO SYSTEM
CONTROL BLOCK

CYLINDER
ASSEMBLY

Hi-Fi
AUDIO
(R) HEAD

Hi-Fi
AUDIO

34 33

(L) HEAD

1-9-7 1-9-8

HE470BLH

Power Supply Block Diagram

AC001

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

HOT CIRCUIT. BE CAREFUL.

F001
T1.6A L 250V

L003

LINE
FILTER

D001 - D004

BRIDGE
RECTIFIER

CAUTION

FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,
REPLACE ONLY WITH THE SAME TYPE T1.6AL/250V FUSE.

T001

Q051

2

4

Q001

12

Q052

13

Q057

14

Q058

15

CAUTION !

Fixed voltage (or Auto voltage selectable ) 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.

MAIN CBA

P-ON+15V
P-ON+32V
P-ON-H

Q053

Q055

Q054

AL+12V/+20.5V
AL+9V
AL+12V
C-POW-SW
AL+5V
TIMER+5V
P-ON+5V
P-DOWN-L
P-OFF-H

HOT

Q003

Q002

7

6

IC001

ERROR
VOLTAGE DET

4

Q004
(SHUNT REGULATOR)

1

23

REG

16

11

17

18

Q059

Q056

COLD

HE470BLP1-9-9 1-9-10

(

e

SCHEMATIC DIAGRAMS / CBA'S AND TEST POINTS

1

Main 1/6 Schematic Diagram Parts Location Guide

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

(B)

Capacity

change rate

±10%

(F) +30 - 80% 20°C –25~+85°C

(SR)

(Y)

±15%

±22.5%

Capacitors and transistors are represented by the fol­lowing symbols.

< PCB Symbols >

(Top View) (Bottom View)

Bottom View)

Transistor or Digital Transistor

E C B

(Top View)

NPN Transistor

Standard

temperature

20°C -25~+85°C

20°C –25~+85°C
20°C –25~+85°C

+

Electrolytic Capacitor

Temperature

range

(Top View)

Notes:

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. 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.

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

4. How to read converged lines.

-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."

5. All resistance values are indicated in ohms

3

(K=10

, M=106).

6. Resistor wattages are 1/4W or 1/6W unless other­wise specified.

7. All capacitance values are indicated in µF

-6

(P=10

µF).

8. All voltages are DC voltages unless otherwise
specified.

9. Voltage indications for PLAY and REC modes on
the schematics are as shown below.

1

(Unit: Volt)

The same voltage for
both PLAY & REC modes.

5.0

< Schematic Diagram Symbols >

PNP Transistor

3

AREA D3

2

1

2

3

5.0
(2.5)

Indicates that the voltage
is not consistent here.

Digital Transistor

AREA B1

1-D3

ABCD

PLAY mod
REC mode

1-B1

Ref No. Position Ref No. Position Ref No. Position

CAPACITORS
C501 B-1 CL504 A-3 R526 A-2
C502 B-1 R527 A-2
C506 C-1 D501 E-4 R528 B-1
C508 E-2 D502 A-1 R529 A-1
C510 E-2 D552 E-3 R530 E-1
C511 E-2 D553 E-2 R531 E-1
C512 E-2 R533 D-1
C513 E-2 IC501 C-3 R551 E-3
C514 E-2 IC503 A-4 R552 E-3
C515 E-2 R556 C-1
C516 E-2 L501 A-1 R557 C-1
C517 E-4 L851 D-3 R558 C-1
C518 E-4 R603 C-4

C519 B-4 Q501 E-2 R611 C-1
C520 A-3 Q502 A-2 R624 D-4
C521 A-2 Q503 D-1 R625 D-4

C522 A-2 Q551 E-3 R851 D-3
C523 A-2 Q552 D-3 R852 D-3
C524 A-2 R853 D-4
C526 A-2 R501 B-1
C527 B-2 R502 B-2 SW506 D-1
C529 A-2 R503 C-2
C530 B-2 R504 B-1 VR501 B-1
C531 B-1 R505 B-1

C532 A-3 R506 C-1 X501 D-2
C533 A-3 R509 D-1 X502 D-2

C535 E-1 R510 C-4
C564 A-2 E511 E-2 PS503 E-1

C851 E-3 R513 E-2 RS501 B-2
C852 E-3 R514 E-2
C853 D-3 R516 D-2 TP501 A-2
C854 E-3 R517 D-3 TP502 C-1
C855 D-3 R518 F-3
C856 D-4 R520 E-4

C859 D-4 R521 E-4
C862 D-3 R522 E-4

CONNECTORS
CL501 A-2 R524 B-4
CL502 F-4 R525 B-3

CONNECTORS

DIODES

ICS

COILS

TRANSISTORS

RESISTORS

R523 B-4

RESISTORS

SWITCHES

VARIABLE RESISTORS

CRYSTAL OSCILLATORS

MISCELLANEOUS

TEST POINTS

E C B

(Top View)

E C B

E C B

(Top View)

NPN Digital Transistor

E C B

PNP Digital
Transistor

1-10-1 SC_08

1-10-2

Main 1/6 Schematic Diagram

IC501 KEY VOLTAGE CHART

KEY 1 (72PIN) KEY 2 (73 PIN)

0.00 ~ 0.51V POWER STOP /E JECT

0.51 ~ 0.92V TV/VCR REW

0.92 ~ 1.27V ----------- PLAY

1.27 ~ 1.61V CH - FF

1.61 ~ 1.98V CH + PAUSE

1.98 ~ 2.39V S-I NH -----------

2.39 ~ 2.90V REC STOP/EJECT

2.90 ~ 3.60V ----------- -----------

3.60 ~ 4.30V ----------- -----------

4.30 ~ 5.00V KEY OFF KEY OFF

Pin No.
Voltage

Comparison Chart of
Models and Marks

MODEL MARK

VR540/02 A
VR540/07 B
VR540/16 C

“ “ = SMD

MODE: SP/REC

THE SAME VOLTAGE FOR

BOTH PLAY & REC MODES.

2

1

5.0

3

5.0

~

(2.5)

INDICATES THAT THE VOLTAGE

IS NOT CONSISTENT HERE.

PLAY MODE

REC MODE

1-10-3

1-10-4

HE470SCM1

Main 2/6 Schematic Diagram

Comparison Chart of
Models and Marks

MODEL MARK

VR540/02 A
VR540/07 B
VR540/16 C

“ “ = SMD

MODE: SP/REC

THE SAME VOLTAGE FOR

BOTH PLAY & REC MODES.

2

1

5.0

3

5.0

~

(2.5)

INDICATES THAT THE VOLTAGE

IS NOT CONSISTENT HERE.

PLAY MODE

REC MODE

1-10-5

1-10-6

HE470SCM2