AEG VCR-4500, VCR-4505 Service manual

SERVICE MANUAL

Sec. 1: Main Section		Sec. 2: Deck Mechanism Section
I Specifications		I Standard Maintenance
I Preparation for Servicing		I Alignment for Mechanism
I Adjustment Procedures		I Disassembly/Assembly of Mechanism
I Schematic Diagrams		I Alignment Procedures of Mechanism
I CBA’s		I Deck Exploded Views
I Exploded views		I Deck Parts List
I Parts List

VIDEO CASSETTE RECORDER

VCR 4500

VCR 4505

PAL

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MAIN SECTION

VIDEO CASSETTE RECORDER

VCR 4500/VCR 4505

Sec. 1: Main Section

ISpecifications

IPreparation for Servicing

IAdjustment Procedures

ISchematic Diagrams

ICBA’s

IExploded Views

IParts List

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 Cabinet Disassembly Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5-1 Electrical Adjustment Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6-1 Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7-1 Function Indicator Symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7-7 Schematic Diagrams / CBA’s and Test Points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8-1 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9-1 Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10-1 IC Pin Function Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11-1 Lead Identifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12-1 Exploded Views. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13-1 Mechanical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14-1 Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15-1

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SPECIFICATIONS

Description	Unit	Minimum	Nominal	Maximum	Remark
1. Video
1-1. Video Output (PB)	Vp-p	0.8	1.0	1.2	FL6A
1-2. Video Output (R/P)	Vp-p	0.8	1.0	1.2
1-3. Video S/N Y (R/P)	dB	40	45		SP Mode,
					W/O Burst
1-4. Video Color S/N AM (R/P)	dB	37	41		SP Mode
1-5. Video Color S/N PM (R/P)	dB	30	36		SP Mode
1-6. Resolution (PB)	Line	230	245		SP Mode
2. Servo
2-1. Jitter Low	sec		0.07	0.12	SP Mode
2-2. Wow & Flutter	%		0.3	0.5	SP Mode
3. Normal Audio
3-1. Output (PB)	dBV	-9	-6	-3	SP Mode
3-2. Output (R/P)	dBV	-9	-6	-1.5	SP Mode
3-3. S/N (R/P)	dB	36	41		SP Mode
3-4. Distortion (R/P)	%		1.0	4.0	SP Mode
3-5. Freq. resp (R/P) at 200Hz	dB	-7	-4		SP Mode
(-20dB ref. 1kHz) at 6kHz	dB	-10	-4		SP Mode
4. Tuner
4-1. Video output	Vp-p	0.8	1.0	1.2	E-E Mode
4-2. Video S/N	dB	39	42		E-E Mode
4-3. Audio output	dB	-10	-6	-2	E-E Mode
4-4. Audio S/N	dB	40	46		E-E Mode
5. Hi-Fi Audio [ VCR 4500 ]
5-1. Output	dBV	-12	-8	-4	SP Mode
5-2. Dynamic Range	dB	70	85		SP Mode
5-3. Freq. resp (6dB B.W)	Hz		20 ~ 20K		SP 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

HG462SP

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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 producing 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.Be careful that foreign objects (screws, solder droplets, 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 connectors, first, disconnect the AC plug from the AC outlet.

1-2-1

U29PSFP

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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’)

≥ 3mm(d) 230 - 240 V ≥

6 mm(d’)

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.

Table 2: Leakage current ratings for selected areas

Chassis or Secondary Conductor
Primary Circuit Terminals
d'	d

Fig. 1

Exposed Accessible Part

	Z	AC Voltmeter
		(High Impedance)

BOne side of

Power Cord Plug Prongs

Fig. 2

	AC Line Voltage		Load Z	Leakage Current (i)	One side of power cord plug
					prongs (B) to:
			2kΩ RES.	i≤0.7mA AC Peak	RF or
			Connected in
				i≤2mA DC	Antenna terminals
			parallel
	230 - 240 V
			50kΩ RES.	i≤0.7mA AC Peak
			Connected in		A/V Input, Output
				i≤2mA DC
			parallel

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

1-2-2

U29PSFP

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STANDARD NOTES FOR SERVICING

Circuit Board Indications

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

Top View	Bottom View
Out	Input
	In

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

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.

FFC Cable

Connector

CBA

Pb (Lead) Free Solder

When soldering, be sure to use the Pb free solder.

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 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 applying 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 tweezers. (Fig. S-1-6)

Caution:

1.The Flat Pack-IC shape may differ by models. Use an appropriate hot-air flat pack-IC desoldering machine, whose shape matches that of the Flat Pack-IC.

2.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)

* Be careful to avoid a short circuit.

1-3-1

NOTE_1

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3.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.

	Hot-air
	Flat Pack-IC
	Desoldering
CBA	Machine
Masking	Flat Pack-IC
Tape
Tweezers
	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)

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

Fine Tip

Soldering Iron

Fig. S-1-4

(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 tweezers. (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

(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 tweezers. (Fig. S-1-6)

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

1-3-2

NOTE_1

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CBA	Fine Tip
	Soldering Iron
	Flat Pack-IC
Tweezers
	Fig. S-1-6

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 “ I ” 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 presolder 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

Presolder

Flat Pack-IC

CBA

Fig. S-1-8

Instructions for Handling

Semi-conductors

Electrostatic breakdown of the semi-conductors 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 semi-conductors are to be placed. Because the static electricity charge on clothing will not escape through the body grounding band, be careful to avoid contacting semi-conductors with your clothing.

<Incorrect>
	CBA
<Correct>	Grounding Band
	1MΩ
	CBA
1MΩ

Conductive Sheet or

Copper Plate

1-3-3

NOTE_1

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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 TP507 (S-INH) to GND. 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.

Q505	Q504
	TP507
	S-INH
	Fig. 1

1-4-1

HG240PFS

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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]VCR Chassis Unit

[4]Jack CBA

[5]Deck Assembly

[6]Main CBA

[7]Cylinder Shield

[8]Jack Board [ VCR 4500 ]

2.Disassembly Method

				REMOVAL
	ID/
		PART		REMOVE/*UNHOOK/
	LOC		Fig.
	.No.			UNLOCK/RELEASE/	Note
			No.	UNPLUG/DESOLDER
	[1]	Top Case	D1	7(S-1)	-
	[2]	Front	D2	*3(L-1),*4(L-2)	-
		Assembly
		VCR Chassis	D3-1	5(S-2), (S-4)
	[3]			2(S-3) --- [ VCR 4505 ],	1
		Unit	D3-2	3(S-3) --- [ VCR 4500 ]
	[4]	Jack CBA	D4	Desolder, (S-5)	-
	[5]	Deck	D5	2(S-6), Desolder	2,3
		Assembly	D6
	[6]	Main CBA	D5	*(L-3) --- [ VCR 4500 ]	-
	[7]	Cylinder	D5	(S-7)	-
		Shield
	[8]	Jack Board	D5	----------	-
		[ VCR 4500 ]
	↓	↓	↓	↓	↓
	(1)	(2)	(3)	(4)	(5)

(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. D5.

3.Before installing the Deck Assembly, be sure to place the pin of LD-SW on Main CBA as shown in Fig. D6. Then, install the Deck Assembly while aligning the hole of Cam Gear with the pin of LDSW, the shaft of Cam Gear with the hole of LD-SW as shown in Fig. D6.

(S-1)

(S-1)

[1] Top Case

(S-1)

Fig. D1

1-5-1

HG462DC

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(L-2)		[ VCR 4500 ]
		(L-2)
			(S-2)
		(S-2)	(S-3)	(S-2)
		(S-3)
				(S-4)
		[3]VCR
		Chassis		(S-3)
		Unit
				(S-2)
[2] Front
Assembly
	(L-1)	Fig. D2
[ VCR 4505 ]
	(S-2)
(S-2)	(S-3)	(S-2)
[3] VCR		(S-4)
Chassis		(S-3)
Unit
		(S-2)
				Fig. D3-2

[4] Jack CBA

(S-5)

Desolder

Fig. D4

Fig. D3-1

1-5-2

HG462DC

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	[7] Cylinder Shield
		Cylinder Assembly			Pin
FE Head
				(S-7)
				ACE Head		SW507
						LD-SW
				Assembly
					[6] Main CBA
[ VCR 4500 ]
[8] Jack Board				[5] Deck	[5] Deck Assembly
				Assembly
(L-3)						Cam Gear
					Shaft	Hole
					Hole
				[6] Main CBA	LD-SW	Pin
		(S-6)				[6] Main CBA
						Fig. D6
				(S-6)
	TOP VIEW			From
	From	From		Capstan Motor
				Assembly
From	Cylinder
		ACE Head
	Assembly
FE Head		Assembly
				Lead with
				blue stripe
			Printing
Lead with	Lead with		side
	blue stripe
white stripe
	Desolder
	from bottom
Lead connections of Deck Assembly and Main CBA
				Fig. D5
				1-5-3		HG462DC
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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 "L5??" 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 position during playback.

Symptom of Misadjustment:

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

	Test point	Adj.Point	Mode	Input
	J23(V-OUT)	VR501	PLAY
	TP502(RF-SW) (Switching Point)			-----
			(SP)
	GND	(MAIN CBA)
	Tape	Measurement	Spec.
		Equipment
	FL6A	Oscilloscope	6.5H±1H
			(412.7 s±63.5 s)
	Connections of Measurement Equipment
			Oscilloscope
	Main CBA	J23
		GND
		TP502
			CH1	CH2
				Trig. (+)
		Figure 1
	EXT. Syncronize Trigger Point
	CH1		0.5H
	1.0H
	CH2	6.5H+/-1H (412.7 s+/-63.5 s)		V-Sync
		Switching Pulse

Reference Notes:

Playback the Alignment tape and adjust VR501 so that the V-sync front edge of the CH1 video output waveform is at the 6.5H±1H(412.7 s±63.5 s) delayed position from the rising edge of the CH2 head switching pulse waveform.

1-6-1

HG240EA

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1-7-1

HG462BLS

Comparison Chart of

Models & Marks

IC501

Model

Mark

AL+5V

TP507

MAIN CBA

SW507

(SERVO/SYSTEM CONTROL)

VCR 4500

A

RS501

KEY

SENS-INH

LD-SW

KEY- 1

7

REMOTE

SWITCH

VCR 4505

B

D502

14

REMOCON-IN

S-LED

SENSOR

KEY

KEY- 2

8

AL+5V

9

LD-SW

SWITCH

Q504

95 CTL(+)

FP562

94

CTL(-)

IC561

LED DISPLAY

ST-S

A

(LED DISPLAY)

10 ST-S

4

END-S

DRV-DATA 68

28 DRV-DATA

D1 23

SENSOR CBA

80 T-REEL

79 S-REEL

DRV-STB

69

2

DRV-STB

D2 22

TP506

Q503

PS503

Q501

DRV-CLK 70

1

DRV-CLK

D3 21

END-S

T-REEL

S-REEL

TIMER+5V

RESET

34

RESET

D4 20

a

17

Q505

TP501

b

16

END-S

D561

STAND-BY

+5V

CTL

c

14

97 CTL AMP OUT

d

13

SENSOR CBA

e

12

D562

POWER

Q562

f

7

TU701(TUNER UNIT)

B

3

SDA

j

11

D563

CAS

Q563

23

POWER-LED

12

SDA

(DECK ASSEMBLY)

24 CAS-LED

5

SCL

25 TIMER-LED

11 SCL

CN504

D564

TIMER

Q564

26

REC-LED

IC503 (MEMORY)

2

CTL(+)

CONTROL

5

SDA

1

CTL(-)

HEAD

6

SCL

D565

REC

Q565

B

AC HEAD ASSEMBLY

AUDIO-SW-1

29

AUDIO-SW-1

AUDIO-SW-2

AUDIO-SW-2

30

TO

AL+5V

IIC-BUS SDA

AUDIO BLOCK

VR501

IIC-BUS SCL

2

PG-DELAY

SW-POINT

A-MUTE-H

AL+5V

31 REC-SAF-SW

A-MUTE-H

83

CYLINDER ASSEMBLY

CAPSTAN MOTOR

IIC-BUS SDA

PG

CN502

SW506

A

IIC-BUS SCL

12 P-ON+15V

P-ON+15V

FROM/TO

SENSOR

Hi-Fi-H-SW

REC-SAFETY

11 AL+12V(2)

AL+12V

Hi-Fi-H-SW

19

Hi-Fi AUDIO

A-MODE

10 GND

A-MODE

32

BLOCK

LINE-MUTE

9

D-PFG

90 D-PFG

LINE-MUTE

28

DRUM

M

8

D-CONT

77 D-CONT

MOTOR

IIC-BUS SDA

7

LM-FWD/REV

81

LM-FWD/REV IIC-BUS SDA

72

IIC-BUS SCL

6

GND

IIC-BUS SCL

71

D-REC-H

5

C-CONT

76

C-CONT

D-REC-H

33

CAPSTAN

M

RF-SW

4

C-F/R

78

C-F/R

RF-SW

18

MOTOR

C-ROTA

3

C-FG

87

C-FG

C-ROTA

15

FROM/TO

M

D-V-SYNC

P-ON+5V

LOADING

2

P-ON+5V

D-V-SYNC

13

VIDEO BLOCK

MOTOR

1

AL+12V/+20.5V

AL+12V/+20.5V

A

H-A-SW 16

H-A-SW

H-A-COMP

H-A-COMP 17

FROM/TO

C-POW-SW

66

C-POW-SW

P-ON-H

V-ENV

POWER

67

P-ON-H

V-ENV

6

SUPPLY

P-DOWN-L

C-SYNC

P-DOWN-L

C-SYNC 58

BLOCK

86

DIAGRAMS BLOCK

Diagram Block Control Servo/System

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2-7-1

					REC-VIDEO SIGNAL	PB-VIDEO SIGNAL	MODE: SP/REC	Comparison Chart of
								Models & Marks
MAIN CBA								Model	Mark
		FROM	IIC-BUS SDA					VCR 4500	A
	IC501 (OSD)
		SERVO/SYSTEM	IIC-BUS SCL					VCR 4505	B
		CONTROL BLOCK

OSD

52

CHARACTER

50

MIX

IC301

Q351

BUFFER

(Y/C SIGNAL PROCESS)

65

43

46

68 69

78

79

SERIAL

(DECK ASSEMBLY)

Y. DELAY

DECORDER

CN253

CYLINDER ASSEMBLY

LUMINANCE

R

P

SP

96

V(R)-1

1

VIDEO (R)-1

SP

95

V-COM

2

HEAD

TU701(TUNER UNIT)

SIGNAL

HEAD

93

V(L)-2

3

PROCESS

EP

AMP

VIDEO (L)-1

VIDEO-IN

6

TUNER

94

V(L)-2

4

HEAD

VIDEO-OUT

24

48

BYPASS

AGC

V-COM

5

VIDEO (L)-2

IN1

50

V(R)-2

6

HEAD

IN2

52

VIDEO (R)-2

FRT

JK756

54

90

HEAD

FRONT

A

V-IN

56

IN2

CHARA.

EP

89

INS.

HEAD

FRT

Y

88

CCD 1H DELAY

AMP

WF1

A

PB/EE

REC FM

+

87

AGC

TP502

MUTE

1/2

C

RF-SW

TUNER

CHROMINANCE

IN1

D-REC-H

80

D-REC-H

SIGNAL

PB/EE

RF-SW

PROCESS

R

P R

P

C-ROTA

MUTE

70

C-ROTA/RF-SW

D-V-SYNC

D-V-SYNC

62

FROM/TO SERVO/SYSTEM

JACK CBA

FBC

Y/C

WF3

CONTROL BLOCK

MIX

A

H-A-SW

J23

H-A-SW 71

V-OUT

H-A-COMP

R

P

H-A-COMP 83

JK101 Q101 CN101

CN151

V-ENV

84

V-ENV

V-OUT1

19

BUFFER

1

V-OUT1

1

61

C-SYNC

AGC

VXO

C-SYNC

67

V-IN1

20

3

V-IN1

3

63

JK102 Q102 CN102

CN152

58

59

28

29

25

21

V-OUT2

19

BUFFER

1

V-OUT2

1

V-IN2

20

3

V-IN2

3

	X301	TP301
	4.433619MHz
		C-PB
		WF2

Diagram Block Video

HG462BLV

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3-7-1

HG462BLA

Comparison Chart of

Models & Marks

Model	Mark
VCR 4500	A
VCR 4505	B

PB-AUDIO SIGNAL

REC-AUDIO SIGNAL

Mode : SP/REC

MAIN CBA

N-A-PB

TO Hi-Fi

N-A-REC

AUDIO BLOCK

		IC301			13 15	17
		(AUDIO SIGNAL PROCESS)
					IN1
					TUNER	IN2
						ALC			12
						DET
					INV
		PB-ON
					R		LINE
	5	EQ				ALC		MUTE	11
			8	9	ATT		AMP
	6	AMP
					P

(DECK ASSEMBLY)		SP/LP-ON
	+5V	7

ACE HEAD ASSEMBLY
		CN504	Q401				REC-ON
AUDIO	3	A-PB/REC	Q402
HEAD	4	A-COM
			BIAS
AUDIO	6	AE-H
			OSC
ERASE	5	AE-H/FE-H
			1	AUTO			REC
HEAD					3	100
			2	BIAS			AMP
			Q406

					SERIAL
				AUDIO HD-SW	DECODER
	FE HEAD			CONTROL
		CN501	Q403	16	68 69 71
FULL				+5V
	2	FE-H
ERASE			Q405
	1 FE-H-GND
HEAD			(PB=ON)		A-MUTE-H
					IIC-BUS SDA	TO SERVO/SYSTEM
					IIC-BUS SCL	CONTROL BLOCK

) A ( Diagram Block Audio

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4-7-1

HG210BLA

Comparison Chart of

Models & Marks

Model

Mark

VCR 4500

A

VCR 4505

B

PB-AUDIO SIGNAL

REC-AUDIO SIGNAL

Mode : SP/REC

JACK CBA

TU701(TUNER UNIT)

MAIN CBA

JK101

AUDIO 2

TU-AUDIO 21

A-IN1

2

CN101

CN151

A-IN1

6

7

A-IN1(L)

7

A-OUT1

1

5

A-OUT1(R)

5

A-OUT1

3

JK102

IC151 (SWITCHING)

PB/EE

A-IN2

2

CN102

CN152

1

Q151

PB/EE

A-IN2

6

8

A-IN2(L)

8

5

BUFFER

3

PB/EE

A-OUT2

1

6

A-OUT2(R)

6

2

IN2

A-OUT2

3

4

TUNER

12

Q152

PB/EE

14

BUFFER

13

IN1

15

IN1

11

SW

10

AUDIO-SW-1

TO SERVO/SYSTEM

AUDIO-SW-2

CTL

9

CONTROL BLOCK

IC301 (AUDIO SIGNAL PROCESS)

13

TUNER

IN1

15

IN2

17

ALC

12

DET

INV

PB-ON

R

LINE

5

EQ

MUTE

11

8

9

ALC

AMP

6

AMP

ATT

P

(DECK ASSEMBLY)

SP/LP-ON

+5V

7

ACE HEAD ASSEMBLY

CN287

CN504

Q401

REC-ON

AUDIO

A-PB/REC

3

3

A-PB/REC

Q402

HEAD

A-COM

4

4

A-COM

BIAS

AUDIO

AE-H

6

6

AE-H

OSC

ERASE

AE-H/FE-H

5

5

AE-H/FE-H

1

AUTO

REC

HEAD

3

100

2

BIAS

AMP

Q406

SERIAL

AUDIO HD-SW

DECODER

FE HEAD

Q403

CONTROL

16

68 69

71

CN501

(SWITCHING)

FULL

+5V

A-MUTE-H

2

FE-H

ERASE

Q405

IIC-BUS SDA

TO SERVO/SYSTEM

1 FE-H-GND

HEAD

(PB=ON)

IIC-BUS SCL

CONTROL BLOCK

) B ( Diagram Block Audio

.www from Downloaded
.Manualslib	VCR 4500		A
	Comparison Chart of
	Models & Marks
com	Model		Mark
	VCR 4505		B
manuals
		JACK CBA
		JK101	CN101		CN151
search	A-IN1(R)	2	9	A-IN1(R)	9
	A-OUT1(L)	3	11	A-OUT1(L)	11
	A-IN1(L)	6	7	A-IN1(L)	7
engine	A-OUT1(R)	1	5	A-OUT1(R)	5
		JK102	CN102		CN152
	A-IN2(R)	2	9	A-IN2(R)	9
	A-IN2(L)	6	8	A-IN2(L)	8
	A-OUT2(R)	1	6	A-OUT2(R)	6
	A-OUT2(L)	3	11	A-OUT2(L)	11

5-7-1

JK758

A-IN(R)

FRONT

JK757

A-IN(L)

N-A-REC

TO AUDIO BLOCK N-A-PB

PB-AUDIO SIGNAL

REC-AUDIO SIGNAL

Mode : SP/REC

CN509

JK751

MAIN CBA

2

A-OUT1(L)

A-OUT

1

A-OUT1(R)

(L)

A-OUT

(R)

SUB JACK CBA

AFV CBA

TU701

CN701

CN1

CN1

CN701

(TUNER UNIT)

4

TU-AUDIO(R)

4

IF SIGNAL

2

SIF

2

22 SIF OUT

5

TU-AUDIO(L)

5

PROCESS

IC451 (Hi-Fi AUDIO SIGNAL PROCESS)

67

MUTE-ON

73

65

74

SW

OUTPUT

VCO

MUTE

72

2

AUDIO IN

SELECT

SW

76

ALC

ALC

ALC

MUTE-ON

77

75

62

70

SW

R-CH

IIC-BUS SDA

COMP

37

NOISE

BPF

LOGIC

IIC-BUS SCL

61

71

R-CH

38

Q451

PNR

P

NOISE

ENV

A-MODE

21

FROM/TO

DET

DET

LINE-MUTE

R

SERVO/SYSTEM

52

47

MUTE 53

CONTROL BLOCK

56

R-CH

48

LIM

DEV

VCO

54

INSEL

50

HOLD

39

Hi-Fi-H-SW

60

PULSE

LPF

2

MIX

V/I

6

10

L-CH

14

LPF

8

INSEL

(DECK ASSEMBLY)

4

15

LIM

DEV

VCO

		L-CH	R							CYLINDER
					DO					ASSEMBLY
		PNR
			P		DET
		ALC						CN253
	+									Hi-Fi
						R	24	Hi-Fi-A(R)	7
			SW		L-CH
				COMP		LIM	26	Hi-Fi-COM	8	AUDIO
78			NOISE		BPF					(R) HEAD
						L	27	Hi-Fi-A(L)	9
80
										Hi-Fi
										AUDIO
						34 33				(L) HEAD

) A ( Diagram Block Audio Fi-Hi

HG462BLH

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6-7-1

Comparison Chart of
Models & Marks		NOTE :
Model	Mark	The voltage for parts in hot circuit is measured using
VCR 4500	A	hot GND as a common terminal.
VCR 4505	B

HOT CIRCUIT. BE CAREFUL.

CAUTION

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

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

A

				T001		B
	F001	L003	D001 - D004
	T1.6A L 250V		BRIDGE		Q051	P-ON+15V
		LINE
	AC001			2	12	P-ON+44V
		FILTER	RECTIFIER
						P-ON-H
					Q052	AL+12V/+20.5V
						Q053
					13	AL+9V
						AL+12V
					Q057
						C-POW-SW
						AL+5V
				4	14	TIMER+5V
					Q058	P-ON+5V
						P-DOWN-L
						Q055
				Q001	15	AL-5V
						Q054
					16	Q059
				Q002	B
					11
				7	17	Q056
				6	18
					Q004
					SHUNT
				IC001	REGULATOR
				ERROR
	Q003			VOLTAGE DET
				4	1
	HOT			3	2
						COLD

Diagram Block Supply Power

HG462BLP

FUNCTION INDICATOR SYMBOLS

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

[ VCR 4500 ]

MODE							INDICATOR ACTIVE
POWER ON	" PWR."							ON
CASSETTE "IN"	"					"		ON
CASSETTE "OUT"	"					"		OFF
CLOCK	" 88:88 "							ON
REC	" REC "							ON
REC PAUSE	" REC "							Blinks at 0.8Hz interval
T-REC,OTR	"				"			ON
								(T-REC OFF,T-REC incomplete
								Blinks at 0.8Hz interval)
RF OUT	RF out channel number is displayed on the indicator panel.
S-INH condition	All modes							Blinks at 0.8Hz interval
All lighting mode	All characters							ON
When reel and capstan mechanism is not	“A R” is displayed on a TV screen. (Refer to Fig. 1.)
functioning correctly
When tape loading mechanism is not func-	“A T” is displayed on a TV screen. (Refer to Fig. 2.)
tioning correctly
When cassette loading mechanism is not	“A C” is displayed on a TV screen. (Refer to Fig. 3.)
functioning correctly
When the drum is not working properly	“A D” is displayed on a TV screen. (Refer to Fig. 4.)
P-ON Power safety detection	“A P” is displayed on a TV screen. (Refer to Fig. 5.)

1-7-7

HG462FIS

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[ VCR 4505 ]

FUNCTION

TAPE IN

TIMER

STANDBY

REC

		" H "= LED Light on, " L "= LED Light off
MODE		INDICATOR ACTIVE
STANDBY	Power on = " H "
	Power off = " L "
FUNCTION	VCR mode = " H "
	TV mode = " L "
TAPE IN	Cassette in = " H "
	Cassette out = " L "
TIMER	Timer stand by = " H "
	One touch recording = " H "
	Timer recording = " H "
	General mode = " L "
REC	REC mode = " H "
	REC pause		Blinks at 0.8Hz interval
	General mode = " L "
When reel and capstan mechanism is not	“A R” is displayed on a TV screen. (Refer to Fig. 1.)
functioning correctly
When tape loading mechanism is not func-	“A T” is displayed on a TV screen. (Refer to Fig. 2.)
tioning correctly
When cassette loading mechanism is not	“A C” is displayed on a TV screen. (Refer to Fig. 3.)
functioning correctly
When the drum is not working properly	“A D” is displayed on a TV screen. (Refer to Fig. 4.)
P-ON Power safety detection	“A P” is displayed on a TV screen. (Refer to Fig. 5.)

1-7-8

HG462FIS

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TV screen

Note:

OSD for mechanical error will be displayed for 5 sec. after the mechanical error occurs.

When reel and capstan mechanism is not functioning	When the drum is not working properly
correctly
A R	A D

Fig. 1	Fig. 4
When tape loading mechanism is not functioning cor-	P-ON Power safety detection
rectly
A T	A P

Fig. 2

Fig. 5

When cassette loading mechanism is not functioning correctly

A C

Fig. 3

1-7-9

HG462FIS

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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	Standard	Temperature
		change rate	temperature	range
	(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

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.All resistance values are indicated in ohms (K=103, M=106).

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

4.All capacitance values are indicated in F (P=10-6 F).

5.All voltages are DC voltages unless otherwise specified.

6.Electrical parts such as capacitors, connectors, diodes, IC’s, transistors, resistors, switches, and fuses are identified by four digits. The first two digits are not shown for each component. In each block of the diagram, there is a note such as shown below to indicate these abbreviated two digits.

Capacitors and transistors are represented by the following symbols.

CBA Symbols

(Top View) (Bottom View)

+

Electrolytic Capacitor

(Bottom View)

Transistor or Digital Transistor

E C B

	(Top View)	(Top View)
	NPN Transistor	PNP Transistor
	E C B	E C B
	(Top View)	(Top View)
	NPN Digital Transistor	PNP Digital
		Transistor
	E C B	E C B

Schematic Diagram Symbols

Digital Transistor

1-8-1

SCPA1

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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 TYPE FUSE.

2. CAUTION:

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. Mode: SP/REC

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

	Unit: Volts	1	2	3	PLAY mode
					REC mode
			5.0	5.0
				(2.5)

The same voltage for

both PLAY & REC modes Indicates that the voltage is not consistent here.

	6. How to read converged lines
	1-D3	3			1-B1
	Distinction Area		AREA D3
	Line Number	2		AREA B1
	(1 to 3 digits)
	Examples:
	1. "1-D3" means that line number "1" goes to area "D3".	1	1-D3
	2. "1-B1" means that line number "1" goes to area "B1".	A	B	C	D
	7. 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.

1-8-2

SCRK05

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