Sony SLV-E420CP, SLV-E420VC, SLV-E520CP, SLV-E520UX, SLV-E520VC Service Manual

SLV-E420CP/VC/E520CP/UX/VC

RMT-V206/V206A/V207/V207A

SERVICE MANUAL

AEP Model

SLV-E420CP/VC/E520CP/VC

UK Model

SLV-E520UX

		Photo : SLV-E520UX
		SPECIFICATIONS
System (SLV-E520UX)		General
Channel coverage		Power requirements
PAL (I) :		220 – 240 V AC, 50 Hz
UHF B21 - B69		Power consumption
RF output signal		17 W
UHF I21 - 69 CH		6W (standby)
Aerial out		Operating temperature
75-ohm asymmetrical aerial socket		5°C to 40°C
		Storage temperature
System (EXCEPT SLV-E520UX)		–20°C to 60°C
Channel coverage		Dimensions
PAL (B, G) :		Approx. 360 x 97 x 298 mm (w/h/d)
VHF E2 - E12		including projecting parts and controls
(comprese channel C)		Mass
(A - H only For	Italy)	Approx. 3.7 kg
UHF E21 - E69		Supplied accessories
CATV S01 - S03, S1 - S20
HYPER BAND S21 - S41		Remote commander (1)
Intermediate frequency		R6 (size AA) batteries (2)
F1 - 1 Video 38.9MHz		Aerial cable (1)
F2 - 1 Audio 33.4MHz		Mains lead (1)
RF output signal
UHF G22 - 69		Design and specifications are subject to change without notice.
Aerial out
75-ohm asymmetrical aerial socket
Inputs/outputs
òEURO-AV1
21-pin
Video input	: pin 20
Audio input	: pins 2 and 6
Video output	: pin 19
Audio output	: pins 1 and 3
JEURO-AV2 (2nd Scart)
21-pin
Video input	: pin 20
Audio input	: pins 2 and 6
Video output	: pin 19
Audio output	: pins 1 and 3
Front Line In (Except SLV-E420CP/VC)
VIDEO IN, Phono jack (1)
Input signal : 0.5 –1.5 Vp-p
75 ohms, unbalanced, sync negative		JVIDEO CASSETTE RECORDER
AUDIO IN, Phone jack (1)
(0 dBs = 0.755 Vrms)
Input level : –8 dBs

Input impedance : more than 47 kilohoms

MICROFILM

SAFETY CHECK-OUT

After correcting the original service problem, perform the following safety check before releasing the set to the customer :

1.Check the area of your repair for unsoldered or poorly-sol- dered connections. Check the entire board surface for solder splashes and bridges.

2.Check the interboard wiring to ensure that no wires are “pinched” or contact high-wattage resistors.

3.Look for unauthorized replacement parts, particularly transistors, that were installed during a previous repair. Point them out to the customer and recommend their replacement.

4.Look for parts which, though functioning, show obvious signs of deterioration. Point them out to the customer and recommend their replacement.

5.Check the B+ voltage to see it is at the values specified.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK !ON THE SCHEMATIC DIAGRAMS AND

IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

– 2 –

TABLE OF CONTENTS

Section	Title	Page	Section	Title	Page
______	____	____	______	____	____

1. GENERAL
Step 1 Setting up the remote commander .....................	1-1
Step 2 Connecting the VCR ..........................................	1-1
Step 3 Tuning the TV to your VCR ...............................	1-1
Step 4 Selecting a language ...........................................	1-2
Step 5 Tuning the VCR to TV Channels .......................	1-2
Step 6 Setting the Clock ................................................	1-2
Additional Tuning Instructions .....................................	1-3
Setting a Satellite Tuner ................................................	1-3
Playing a Tape ...............................................................	1-3
Recording TV Programmes ...........................................	1-4
Recording TV Programmes using Video Plus + ...........	1-4
Playing/Searching at Various Speeds ............................	1-5
Setting the Timer Manually ...........................................	1-5
Recording TV Programmes using the Quick Timer ......	1-6
Checking/Cancelling Timer Settings .............................	1-6
Searching using the index function ...............................	1-6
Editing with another VCR .............................................	1-7E
Adjusting the Picture .....................................................	1-7E
Visual index ...................................................................	1-7E

2. DISASSEMBLY
1-1. Removal of Cabinet, Mechanism Unit and Main
Board .....................................................................	2-1
Removing the Cabinet Parts ..................................	2-1
Removing the Mechanism Main Unit and the
CP-1 PWB Assembly .............................................	2-1
l-2. Temporarily Setting Up and Connecting
CP-1 PWB Assembly .............................................	2-3E
1-3. Installation of the Front Panel ................................	2-3E
3. DIAGRAMS
Circuit Boards Location ................................................	3-1
Overall wiring Diagram ................................................	3-3
Mechanism Connection Diagram ..................................	3-5
Video Circuit Diagram ..................................................	3-6
System Control & Servo Circuit Diagram ...................	3-9
Audio Circuit Diagram ..................................................	3-12
Terminal & Input/ Output Selector Circuit Diagram
(Except SLV-E520UX) ..................................................	3-13E

4.SCHEMATIC DIAGRAMS AND PRINTED WIRING BOARDS

CP-1 Board (PW-A) Power Supply Circuit Diagram ....	4-1
CP-1 Board (AD-A) Terminal &
Input/Output Selector ....................................................	4-3
CP-1 Board (VA-A) Video & Audio Circuit Diagram
(Except SLV-E520UX) ..................................................	4-5
CP-1 Board (VA-A) Video & Audio Circuit Diagram
(SLV-E520UX) ..............................................................	4-7
Video Circuit Waveforms ..............................................	4-9
VP-1 Board Video Pre-Amp circuit Diagram ...............	4-10
CP-1 Board (SV-A) Servo Circuit Diagram ..................	4-12
Servo Circuit Waveforms ..............................................	4-14
CP-1 Board (SY-A) System Control, Timer & Tuner
(Except SLV-E520UX) ..................................................	4-15
IC 301 System Control, Timer & Tuning Control MPU Pin
Functions Table .............................................................	4-16
CP-1 Board (SY-A) System Control, Timer & Tuner
(SLV-E520UX) ..............................................................	4-17
TM-1 Board Operation Key Circuit Diagram ...............	4-23
TM-2 Board Circuit Diagram ........................................	4-25
A7101 Display (FLD) Grid/Anode Assignment
Drawing & Table ...........................................................	4-26
TM-9 Board PDC/VPS (SLV-E520VC, SLV-E420VC &
SLV-E520UX) ...............................................................	4-27E

5. ADJUSTMENTS
1. Maintaining and Checking the Mechanism ...............	5-1
l -1. Regular Checks and Maintenance Items ...............	5-1
1-1-1. Regular Checks ................................................	5-1
1-1-2. Cleaning ............................................................	5-1
1-2 Service Tools ...........................................................	5-2
1-2-1. Service Tools ...................................................	5-2
1-2-2. Using the Relay Cable (VHJ-0106) ..................	5-3
2. An Overview of the Mechanism ................................	5-3
2-1. Names of the Main Parts ........................................	5-3
2-1-1. Cassette Mechanism Assembly ........................	5-3
2-1-2. Top View ..........................................................	5-4
2-1-3. Under Side ........................................................	5-4
2-2. An Overview of the Mechanism Modes ................	5-5
2-2-1. Mechanism Mode Switching Table ..................	5-5
2-2-2. Movement Check List for the Main Parts of the
Mechanism ........................................................	5-6
2-2-3. How to Check the Mechanism
Mode Position ...................................................	5-6
2-2-4. Self-Diagnosis Display .....................................	5-6
3. Disassembling the Main Parts of the Mechanism .....	5-7
3-1. How to Make the Mechanism Move ......................	5-7
3-1-1. How to Operate the Loading Motor Using
A DC Voltage Supply .......................................	5-7
3-1-2. Operating the Loading Motor
by the Manual Method ......................................	5-7
3-1-3. Making the Mechanism Move
Using the Manual Method ................................	5-7
3-2. Mechanism Unit .....................................................	5-8
3-3. Cassette Drive Mechanism .....................................	5-8
3-3-1. Cassette Mechanism Assembly ........................	5-8
3-3-2. Cassette Drive Gear ..........................................	5-9
3-3-3. Door opener, Under Frame and Stand L ...........	5-9
3-3-4. Start Rack Gear and Front Rack Gear ..............	5-10
3-4. Cleaner Roller Assembly .......................................	5-10
3-5. Cylinder (DRUM) ..................................................	5-11
3-5-1. Upper Cylinder Assembly (UPPER DRUM) ...	5-11
3-5-2. Cylinder Motor (ROTOR and STATOR) ..........	5-12
3-5-3. Cylinder Assembly ...........................................	5-12
3-6. FE Head and ACE Head .........................................	5-13
3-6-1. Audio R/P Head Assembly (ACE HEAD) ........	5-13
3-6-2. Full Erase Head ................................................	5-13
3-7. Capstan Motor ........................................................	5-14
3-7-1. Capstan Motor ..................................................	5-14
3-7-2. Capstan Brake Assembly ..................................	5-14
3-8. Loading Motor Assembly and
Worm Gear Assembly ............................................	5-15
3-9. Pinch Roller Pressure Mechanism .........................	5-15
3-9-1. Pinch Roller Lever Assembly ...........................	5-15
3-9-2. Pinch Lift Cam and Pinch Cam Gear ...............	5-16
3-10. L Guide Lever Assembly and
Load Lever Assembly ..........................................	5-17
3-11. BT Lever Assembly .............................................	5-17
3-12. Reel Drive Mechanism .........................................	5-18
3-12-1. Reel belt, Reel Pulley, Friction Gear
Assembly and Clutch Change Lever ...............	5-18
3-12-2. Clutch Mounting Assembly ............................	5-18
3-12-3. S Soft Lever, Supply Reel Assembly
and S Reel Gear ..............................................	5-18
3-12-4. T Soft Brake Assembly, Take Up Reel
Assembly, T Reel Gear ...................................	5-19
3-13. Brakes ..................................................................	5-19
3-13-1. S Brake Assembly, T Brake
Assembly, T Brake ACT Slide ........................	5-19
3-13-2. Brake Control Lever and Brake ACT Lever
Assembly ........................................................	5-20

– 3 –

Section	Title	Page
______	____	____
3-13-3. S Brake ACT Slide and BT Spring Lever
Assembly ........................................................		5-20
3-14. Guides ..................................................................		5-21
3-14-1. Guide Roller Assembly ...................................		5-21
3-14-2. S and T Incline Mounting Assemblies ............		5-21
3-15. Wheel Gear 2, Main Cam and Mode Switch .......		5-22
3-16. Crescent Slide ......................................................		5-23
3-17. S Load Gear, T Load Gear, S Load Lever
Assembly and T Load Lever Assembly ...............		5-24
3-18. Tape Sensors, Reel Sensor and EP SW Lever ......		5-25
3-18-1. Tape Top Sensor and Tape End Sensor ...........		5-25
3-18-2. Reel Sensor .....................................................		5-25
3-18-3. EP Switch Lever .............................................		5-25
4. Mechanism Checks and Adjustments ........................		5-26
4-1. Reel Table Torque Check .......................................		5-26
4-2. Adjusting the BT Lever Assembly Position and
Checking the Back Tension Torque in Play Mode . 5-26
4-2-1. BT Lever Pole Position Adjustment .................		5-26
4-2-2. Checking the Back Tension Torque
Play Mode .........................................................		5-26
4-3. Tape Path Adjustment	............................................	5-27
4-3-1. Adjustment Procedure ......................................		5-27
4-3-2. Load Lever Assembly Height Adjustment ........		5-27
4-3-3. Guide Roller Height Adjustment ......................		5-28
4-3-4. Audio R/P Head (ACE HEAD) Height
Adjustment, Azimuth Adjustment and
Horizontal Position Adjustment ........................		5-29
4-3-5. Checking After Adjustment ..............................		5-30E

6. ELECTRICAL ADJUSTMENTS

Circuit Boards Location ................................................	6-1
Self -Diagnosis Display .................................................	6-2
1. Self-Diagnosis Contents and Mechanism Mode
Display ......................................................................	6-2
2. Electrical Adjustment ................................................	6-4
2-1. Servo Circuit Adjustment .......................................	6-4
2-1-1. Test Equipment and Standards Required ..........	6-4
2-1-2. Location of Adjustment Points .........................	6-4
2-1-3. Switching Position Adjustment ........................	6-5
2-2. Video Circuit Relay Jig ..........................................	6-6
2-2-1. Test Equipment and Standards Required ..........	6-6
2-3. IF Circuit Adjustment ............................................	6-7E
2-3-1. Test Equipment and Standard Required ...........	6-7E
2-3-2. Location of Adjustment Point ...........................	6-7E
2-3-3. RF AGC Adjustment ........................................	6-7E
3. Test Points for Tape Path Adjustment .......................	6-7E

7. EXPLODED VIEWS

7-1.	Cabinet & Chassis Parts .........................................	7-1
7-2.	Mechanism Parts-1 .................................................	7-2
7-3.	Mechanism Parts-2 .................................................	7-3E

8. ELECTRICAL PARTS LIST .................................	8-1
Hardware List ................................................................	8-9E

– 4 –

SLV-E420CP/VC/E520CP/UX/VC

SECTION 1

GENERAL

This section is extracted from SLV-E520UX instruction manual.

1-1

1-2

1-3

1-4

1-5

1-6

1-7 E

SLV-E420CP/VC/E520CP/UX/VC

SECTION 2

DISASSEMBLY

1-1. REMOVAL OF CABINET, MECHANISM UNIT, AND MAIN BOARD

REMOVING THE CABINET PARTS (Fig. 1-1-1 )

1.Remove the cabinet and bottom cover by removing the four screws 1 and four screws 2 .

2.Pull out the shuttle knob by fingers together with the button assembly, and remove the front panel by removing the locks of the clamps (A) using a screwdriver. etc., and slightly rotating the bottom part in the direction of the arrow.

Notes: • Electrical adjustments for the this model can be performed with only the cabinet removed.

•When replacing the bottom cover, do not tighten the screws 2 too much. Excess tightness may

damage the screw taps on the chassis.

REMOVING THE MECHANISM MAIN UNIT AND THE CP-1 PWB ASSEMBLV (Fig.1-1-2 and 1-1-3)

After removing the cabinet parts, remove the mechanism unit and the CP-1 PWB assembly connected as follows.

1.First, remove the red screw 3 of the TB-1 PWB, spread out lock clamps (B) and (C) in the arrow direction slightly and remove TM-1 PWB and TM-2 PWB as shown in Fig. 1-1-2.

2.Remove the screw 4 at the back of the chassis.

3.Remove the red screw 5 in the chassis, remove the red screw 6, and remove the holder in this order.

4.Remove the two screws 7 and two screws 8 of the mechanism unit. The two screws 8 of the cassette tray can be removed easily by pushing the tray lock lever in the arrow direction to remove the lock as shown in the enlarge view A and by pushing the lid opener lever in the arrow direction to remove the lock as shown in the enlarge view B.

5.Lift up the whole mechanism unit and main board (CP-1 PWB assembly), and as shown in Fig. 1-1-3. push the two lock clamps (D) of the chassis i n the arrow direction so that they can be removed from the chassis.

1

1

Cabinet

1

1

Clamps (A)

Main Unit

Front Panel

Bottom Cover

Button Assembly	2
	Shuttle Knob

22

2	Fig. 1-1-1

2-1

A	Terminal Board		7
			5
				Holder
				6
Tray Lock Lever		8	8
			4	7
				Lid Opener Lever
(B)
TM-2 PWB
		(C)
	(B)	(C)		B
3	(C)
		(C)	(C)
			(C)
TM-1 PWB			Chassis
			Cassette Tray
				Fig. 1-1-2

Mechanism Main Unit	VP-1 PWB Assembly

CP-1 PWB Assembly

TM-2 PWB

TM-1 PWB

Clamps (D)

Chassis

Fig. 1-1-3

2-2

1-2. TEMPORARILY SETTING UP AND CONNECTING CP-1 PWB ASSEMBLY

The following is an example of how to place and connect the main board without a jig, when repairing the CP-1 PWB assembly.

1.Place the mechanism unit and main board up side down as a whole on a flat surface with the foil side of the main board facing up.

CP-1 PWB Assembly (Foil side)

2.Operate the unit using the buttons on TM-1 PWB or the remote control.

Screws 9

Terminal Board

Mechanism Main Unit

TM-1 PWB

Cassette Compartment

TM-2 PWB

Fig. 1-1-4

1-3. INSTALLATION OF THE FRONT PANEL

When installing the front panel to the chassis after repaires and adjustments.

1.Pressing down the door opener lever of the mechanism main unit.

2.Set the cassette door to half-opened state as shown in Fig. 1-1-5, and install the front panel to the chassis.

Note: Opened cassette door position does not install the front panel to the chassis.

Jutted part of

Cassette Holder

Front Panel

Door Opener Lever

Cassette Door

(Position A)

Cassette Door
(Position B)	Fig. 1-1-5

2-3 E

SLV-E420CP/VC/E520CP/UX/VC

SECTION 3

DIAGRAMS

CIRCUIT BOARDS LOCATION

3 in 1 Tuner	VP-1 PWB Assembly
(Tuner / RF Conv.)

CP-1 PWB Assembly

TM-2 PWB

TM-1 PWB

TM-9 PWB

3-1

SLV-E420CP/VC/E520CP/UX/VC

SECTION 5

ADJUSTMENTS

1. MAINTAINING AND CHECKING THE MECHANISM

1-1. REGULAR CHECKS AND MAINTENANCE ITEMS

To obtain full function and maximum performance from the set, and to stop it getting dirty or scratched, we recommend that you carry out the following maintenance procedures and regular checks. The maintenance checks described in the following section should also be carried out without fail after carrying out any repairs to the set.

NOTE: OIL AND GREASE

•Always use the specified brands of oil and grease. If you use a grease with the wrong viscosity, for example, this can lead to all sorts of problems. Be careful to keep the oil and grease free of dust and foreign bodies.

•A “drop” of oil is the amount of oil remaining on the tip of a rod with a diameter of 1.5mm after it is dipped in oil to a depth of 1cm and then taken out.

1-1-1. REGULAR CHECKS									Clean	Check Oil
	Hours of use (H)
Part maintained		500 1000	1500	2000	2500	3000	3500	4000	4500	5000	Remarks
	Tape guide
	ACE head, full erase head										The life of parts varies
Tape path Cylinder (drum)
		( )	( )	( )	( )	( )	( )	( )	( )	( )	enormously, depending
system											on the environment in
											which the part is used.
	Cleaner roller assembly
	Pinch roller
	Reel table
Drive	Reel belt
system	Relay gear, Pulley shaft, Gear shaft
	Loading motor
	Back tension										Playback tension torque:
											30 to 50g/cm
Perform-	Brake system
ance											FWD: 600g/cm or over
checks	FWD, REW, PLAY torque,										REW: 600g/cm or over
											PLAY (SP mode):
	REV torque										80 to I 40g/cm
											REV: 120 to 220g/cm
1-1-2. CLEANING
1. Cylinder (Drum) (See Fig.1-1-1 )
Moisten a chamois with methyl alcohol and clean the video
head (including the Hi-Fi audio head) and the tape path
surface of the cylinder. Be sure to wipe horizontally in
relation to the video head. If you wipe vertically, or use											Cylinder
excessive force, you can damage the video head.
											(Drum)

2. Tape Path System / Reel Drive System

Clean the pinch roller, the capstan shaft, the tape guides, the FE head, the ACE head, the reel table, the pulley and the reel belt with a soft cloth, or chamois, moistened with methyl alcohol.

Tape path surface

Video head

Fig.1-1-1

5-1

1-2. SERVICE TOOLS

1-2-1. SERVICE TOOLS

NOTES ON ALIGNMENT TAPES

Select a PAL or NTSC alignment tape from the list below, according to the transmission system of the VCR you are repairing.

PAL: For models with 625 scanning lines and a field frequency of 50Hz NTSC: For models with 525 scanning lines and a field frequency of 60Hz

	No.	Tool		Tool No.			Remarks
				NTSC		PAL
	1	Alignment tape		VHJ-0005		VHJ-0008	SP colour bar 1kHz (normal)
	2	Alignment tape		VHJ-0006		VHJ-0009	SP monoscope 7kHz (normal)
	3	Alignment tape		VHJ-0007		––––––––	EP monoscope
	4	Alignment tape		––––––––		VHJ-0052	LP monoscope
	5	Eccentric screw driver		VHJ-0003			Used to adjust the tape path
	6	Nut box		VHJ-0048			Used to adjust the height of the
							lever load assembly
	7	Torque dial gauge		VHJ-0004			Used to measure reel winding
							torque
	8	Cassette torque meter		VHJ-0016			Used to measure back tension
							torque
	9	Load lever assembly height adjustment tool		VHJ-0102			Used to adjust the height of the
							load lever assembly
	10	Torque gauge screwdriver		VHJ-0014			Used to adjust the tightening torque
							of screws
	11	3 mm dia. bit for torque screwdriver		VHJ-0045			Used to replace the bit of the torque
							gauge screwdriver
	12	Video head removing tool		VHJ-0041			Used to remove the upper cylinder
	13	Oil		VHJ-0099
	14	Grease		VHJ-0100
	15	Grease		VHJ-0101
	16	Relay cables		VHJ-0106			Relay cables of mechanism and
							CP-1 PWB assembly
	VHJ-0005, VHJ-0006, VHJ-0007		VHJ-0003		VHJ-0048		VHJ-0004

No. 1, 2, 3, 4	No. 5	No. 6	No. 7
VHJ-0016	VHJ-0102	VHJ-0014	VHJ-0045

No. 8	No. 9	No. 10	No. 11
VHJ-0041	VHJ-0099	VHJ-0100, VHJ-0101	VHJ-0106

No. 12

No. 13

No. 14, 15

No. 16

Fig.1-2-1

5-2

1-2-2. Using the Relay Cable (VHJ-0106)

The mechanism can be repaired without using the relay cable (VHJ-0106). As shown in Fig. 1-3-1, the relay cable (VHJ-0106) is a tool used for relay between the CP-1 PWB assembly and mechanism unit.

When connecting it, take note of the pin number of the connector.

NOTE 1: Do not place the mechanism upright as shown in Fig. 1-3-1 when inserting/ejecting the cassette.

NOTE 2: For NTSC models, be sure to connect the VM-1 PWB assembly and CP-1 PWB assembly.

VM-1 (VP-1) PWB assembly

	Relay cable:
	VHJ-0106
CP-1 PWB assembly	Mechanism unit

Fig. 1-2-2

2. AN OVERVIEW OF THE MECHANISM

2-1. NAMES OF THE MAIN PARTS

2-1-1. CASSETTE MECHANISM ASSEMBLY

Stand L

	Release lever
Tray lock	Lid opener spring
spring

Pinion gear

Under frame

Lock gear Door opener

lever

Gear holder

Drive gear

Fig. 2-1-1

5-3

2-1-2. TOPVIEW

Cleaner roller assembly Capstan brake assembly

	Cleaner lever	Audio R/P head assembly
	Cylinder (Drum)	(ACE head)
		Capstan motor
	Cylinder mounting
	Guide roller assembly	Pinch roller lever assembly
		Pinch lift cam
	T incline mounting assembly	Pinch lift mounting
		Front rack gear
	Full erase head	Opener mounting
	S incline mounting assembly	Pinch cam gear
	Guide roller assembly	Start rack gear
		Load lever assembly
	Tape end sensor
		Tape top sensor

BT lever assembly

L guide act lever assembly

Tape sensor LED

BT spring

Band brake assembly

Supply reel assembly

T soft brake assembly

S soft lever

EP switch

Take-up reel assembly

	S brake	T brake act slide	T reel gear
EP sw lever

	assembly
	T brake assembly	Clutch mounting assembly
	S reel gear

Fig. 2-1-2

2-1-3. UNDERSIDE

		Cylinder earth
Reel belt	Capstan motor	assembly

Stator

Rotor

Harness mounting

T load gear

S load gear

Pinch cam gear

Crescent mounting

T load lever assembly

Mode switch (S8001)

					S load lever assembly
	Brake control lever				BT spring lever assembly
	Main cam
	Clutch change lever				MC-1 PWB assembly
	Crescent slide
			Brake act lever	Reel pulley
	Wheel gear 2	Wheel gear 1	assembly		S brake act slide
		Worm gear assembly			Friction gear assembly
			Loading motor assembly

Fig. 2-1-3

5-4

2-2. AN OVERVIEW OF THE MECHANISM MODES

2-2-1 . MECHANISM MODE SWITCHING TABLE

NOTE: The letters and figures enclosed in circles in the mechanism mode column are the codes on the crescent slide.

HEX	Mechanism mode		The principal mode-switching states of the mechanism
DATA
	EJECT E
6								CASSETTE OUT
	Distinguished by whether the
									(EJECT)
	EP switch is ON or OFF.
	Horizontal shift section.
	Vertical shift section.
2
				IN REW
	IN REW R		(SHORT REW)
0
7	INITIAL 7								INITIAL
								(POWER OFF)
0	Cleaner roller assembly: ON	When loading is carried out starting at
	S/T mounting incline assembly	the CASSETTE IN position
1
	pressure begins.

0S/T mounting incline assembly pressure ends.

1					REVIEW
	REVIEW 1
0
2	IDLER pos. 2
	(Pinch roller OFF)
0
3	STILL/SLOW 3					STILL/SLOW
0
5	PLAY/STOP 5	REC PAUSE	REC	STOP	P LAY	CUE

0
	BRAKE pos. 4
4
0
	FF/REW 6
6
		REW		FF

MODE SWITCH OUTPUT TABLE

HEX		SW DATA			SW DATA 2
DATA	1	X		Y	Z
0	5.0V	H		H	H	5V
1	5.0V	H		H	L	0V
2	2.5V	H		L	H	5V
3	2.5V	H		L	L	0V
4	3.4V	L		H	H	5V
5	3.4V	L		H	L	0V
6	2.0V	L		L	H	5V
7	2.0V	L		L	L	0V

APPEARANCE OF MODE SWITCH AND RELATIONSHIP BETWEEN MODE POSITIONS

FF/REW EJECT BRAKE

CASSETTE IN

IN REW PLAY/STOP

STILL/SLOW

INITIAL

IDLER

REVIEW

Fig. 2-2-1

5-5