DOWNLOAD Sony SLV-E420CP / SLV-E420VC / SLV-E520CP / SLV-E520UX / SLV-E520VC Service Manual ↓ Size: 6.3 MB | Pages: 66 in PDF or view online for FREE

1) Play the alignment tape (NTSC:VHJ-0006, PAL:VHJ-00

09) and check that the envelope waveform is activated
immediately and that there are no fluctuations in the
envelope waveform or the audio output waveform.

2) Load a cassette tape (NTSC:T-120, PAL: E-180) and

use it to record and replay. Check that the envelope
waveform is activated immediately and that there are no
fluctuations in the envelope waveform or the audio
output waveform. (When recording on the tape, input
1kHz to the audio input terminal. Use a scratch-free
cassette tape (NTSC: T-120, PAL: E-180).) Check that
at the tracking centre, the front half down and back half
down are not more than 20% of the value at the point
where the envelope waveform amplitude is at its
maximum.

3) Check that the envelope waveform is activated immedi-

ately when you switch from PLAY to R-SEARCH or from
R-SEARCH to PLAY. Check that there is no slack in the
tape next to the pinch roller.

4) Check that the envelope waveform is activated immedi-

ately when you switch to PLAY from FF, REW, F-
SEARCH, R-SEARCH or STOP mode. Check that there
is no slack in the tape next to the pinch roller.

5) Check that the tape is not curling or riding up on the

upper or lower flanges of the tape guides in PLAY, FF,
REW, F-SEARCH or R-SEARCH modes.

6) Check that in PLAY mode. the tape runs as shown in

Fig. 4-3-7.

7) Load a tape (NTSC:T-160, PAL: E-240) and play it back.

carry out the checks described in steps 3) to 5) above.

No. 0 tape
guide

S tape guide

S guide
roller

Cylinder
(drum)

T guide roller

Audio R/P head assembly
(ACE head)

T tape guide

Loading guide
post

BT post

Full erase
head

Pinch roller

Capstan shaft

Fig. 4-3-7

CP-1 PWB Assembly

VP-1 PWB Assembly

3 in 1 Tuner
(Tuner / RF Conv.)

TM-1 PWB

TM-9 PWB

TM-2 PWB

This unit displays the diagnosis contents of abnormalities and the mechanism mode on its display panel in 2-digit numbers.
These display shows the outline of the problems. Use it as a reference when servicing the unit.

• When the STOP button on the remote control is pressed for about 10 seconds continuously, the self- diagnosis number

will be displayed on the reception channel display of the display panel and number indicating the failed mechanism mode
(changed mode when being shifted) on the tape counter “seconds” display for 10 seconds each.

• During self-diagnosis display, displays other than the diagnosis number/mechanism mode number will be turned off and

when displays end, the normal display will be returned automatically.

• Refer to “Self-Diagnosis Contents” for the self-diagnosis numbers and the “Mechanism Mode Display Contents” for the

mechanism mode numbers.

• When the “0” button on the remote control unit is pressed during display, and clearing the self-diagnosis display and

mechanism mode display.

Display panel

Self-Diagnosis number
(Reception channel display)

Mechanism mode number
(Tape counter “Seconds” display)

No.

Problem

Main Possible Cause

Mechanism Operations and
State After Occurrence

00 There is no abnormality in the mechanism.

The cylinder motor does not rotate.

• The cylinder motor is faulty.

Shifts to the STOP mode.

01

• The control of the cylinder motor is
   faulty.
• The tape winds around the cylinder.

The take-up reel does not rotate.

• The take-up reel is caught.

Shifts to the STOP mode.

02

• The reel belt is faulty.
• The take-up torque has decreased.

The capstan motor does not rotate.

• The capstan motor is faulty.

Shifts to the STOP mode.

03

• The control of the capstan motor is
   fauIty .

The tape cannot be loaded with the

• Error in the operations of the tape

Unloads, shifts to the INITIAL mode,

cassette inserted.

  loading mechanism.

and the power goes off.

(But unloading can be performed.)

• Foreign particles in the tape

04

   loading mechanism.
• The tape end sensor is faulty.
• The reel brake of the tape cassette
   has not been released.

Tape loading and unloading cannot

• The tape guide is caught.

The power is forcibly turned off with

05

be performed with the cassette

• The loading motor is faulty.

 the mechanism at its current position.

inserted.

• The control of the loading motor is
   faulty.

No.

Problem

Main Possible Cause

Mechanism Operations and
State After Occurrence

Front unloading cannot be performed • The cassette drive mechanism is

Front loads and shifts to the STOP or

when ejecting the cassette.

   faulty .

INITIAL mode.

(Front loading can be pertormed.)

• The front door is caught.

• When the power switch is turned on
  before eject operations: Shifts to the

06

  STOP mode.
• When the power switch is turned off
  before eject operations: Shifts to the
  INITIAL mode and the power goes
  off.

Front loading and front unloading

• The tape cassette is caught in the

The power is forcibly turned off with

cannot be performed when ejecting

  cassette drive mechanism.

the mechanism at its current position.

the cassette.

• The main cam and front rack gear of

07

  the front loading mechanism have
  not engaged properly.
• The gears of the front loading drive
  mechanism have not engaged
  properly.

The mechanism becomes 1(REVIEW)

• The mechanism mode switch

The power is forcibly turned off with

08

while moving from 2 (IDLER),

  contact is faulty.

the mechanism at its current position.

3 (STILL), 4 (BRAKE), and to
5 (STOP).

The mechanism becomes 7 (INITIAL)

• The mechanism mode switch

Carries out tape take-up operations,

09

while moving from 1 (REVIEW),

  contact is faulty.

shifts to the INITIAL mode,

2 (IDLER), 3(STILL), 4 (BRAKE),

and the power goes off.

and to 5 (STOP).

For details of mechanism operations corresponding to the mechanism positions of the self-diagnosis numbers 08
and 09 above, refer to the separate volume on the V95 I mechanism manual.
These manual reference numbers are shown in the cover.

Mode No.

Mechanism Mode

Mode No.

Mechanism Mode

Mode No.

Mechanism Mode

00

CASSETTE OUT

08

PLAY

16

VIDEO INSERT

01

STANDBY

19

REC

17

VIDEO INSERT – PAUSE

02

STOP

10

AUDIO DUBBING

18

AUDIO/VIDEO INSERT

03

STILL

11

X2 SPEED PLAY

19

REVERSE X2 SPEED PLAY

04

REC-PAUSE

12

CUE

05

AUDIO DUBBING – PAUSE

13

REVIEW

06

FRAME ADVANCE

14

FAST FORWARD

07

SLOW

15

REWIND

99

OTHERS