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— 21 —

7)

NVRAM write error-code check: 99
The error which occurs during the normal operation mode, and t he mechanism mode when the error occurs can be checked.  The error
code can be reset, too.
Saving the data in EEPROM and reset can be performed by pressing the LIGHT button.
The two digit mechanism mode code is displayed: The first digit indicates the present mode and the second digit indicates the next
mode.

When the present mode and the next mode are the same, it indicates that an error occurs.
When the present mode and the next mode are different, it indicates that an error occurs during transition from the present mode to the
next mode.

7.

Error code table

*

When position of rotary encoder cannot be detected, an error code is created in such a way that 0 is added in the top of the present

position number, and is displayed.

Code

Contents

0

INITIAL CODE

1

×

 1_FWD

2

×

 3_FWD

3

×

 4_FWD

4

×

 25_FWD

5

REC

6

UNLOAD

7

EJECT

8

STOP

9

×

 1_REV

A

×

 3_REV

B

×

 4_REV

C

×

 25_REV

D

FF

E

REW

F

PAUSE (FWD-PAUSE)

Block

Control motor (Rotary encoder)

Mechanism deck

Drum

Capstan

Reel

EEPROM

Code

00

01* ~ 0F*

10

11

12

13

14

15

20

21

30

31

40

41

90

91

92

Contents

No error.

Position cannot be detected.

Loading cannot be completed.

Unloading cannot be completed.

Eject does not take place.

T-side end sensor is defective.

S-side end sensor is defective.

Dew condensation.

Drum motor does not rotate.

Drum servo does not lock in.

Capstan motor does not rotate.

Capstan speed does not lock in.

T-reel FG cannot be detected.

S-reel FG cannot be detected.

B group data saving resulted in NG.

C group data saving resulted in NG.

B and C group data saving resulted in NG.

Present position

STOP ~ FWD

EJECT

CASS-IN ~ UNLOAD

FWD

LOADING-L

UNLOAD

FF-REW ~ STOP

Error code

01

02

03

05

06

07

08

Present position

STOP

EJECT ~ CASS-IN

CASS-IN

FF-REW

FWD ~ REV

LOADING-H

REV

Error code

09

0A

0B

0C

0D

0E

0F

— 22 —

Mechanism adjustment parts layout diagram

– Mechanism –

– Main board –

Note:

Be sure to perform the tape pass adjustment when rotary drum is replaced.

Preparation: Oscilloscope

CH-1: AC 100 mV/DIV
CH-2: DC 2 V/DIV
TRIG: CH-2

1.

Connect an oscilloscope CH-1 to TP524 (RF) and CH-2  to TP525 (SWP).

2.

Insert a test tape TY-7915 and find the center of the tape.

3.

Establish the test mode.

4.

Select and set the test mode code 42.

5.

Decrease the SG1 guide (by rotating it clockwise), and remove a tape (Fig. 1).

6.

Move down the TG1 guide (by turning it clockwise), remove a tape (Fig. 2) and turn it counter-clockwise until the right side edge of the
RF waveform becomes square as shown (Fig. 3).

7.

Turn the SG1 guide counter-clockwise until the left side edge of the RF waveform becomes square as shown (Fig. 4).

Notice that the lower flange of the stationary guide does not contact with tape.
Confirm also that tape runs along with the upper flange of the SG1 and TG1 guides.

8.

Adjust the lower flange of the stationary guide.  Adjust height of the stationary guide until the lower flange contacts the tape during tape
run in the PLAY mode.  Tape must not show any curls.

9.

Perform the switching pulse adjustment. (Refer to 3-3. ELECTRICAL ADJUSTMENT) (Fig. 5) 1083±25µsec.

10. Select and set the test mode code 02.

11. Observe the RF waveform and confirm that the waveform increases and decreases its amplitude while maintaining it parallel waveform.

(Fig. 6)

12. Repeat the STOP, UNLOAD and FWD modes, and confirm that the RF waveform follows step 11. When the RF waveform loses

parallel shape, repeat steps 5 to 8.

13. Move down the SG1 guide (by turning it clockwise), and confirm that the RF waveform loses parallel shape, then return the SG1 guide

to original position.  When the original waveshape cannot be restored (Fig. 7), repeat steps 5 to 8.

– 23 –

14. Move down the TG1 guide (by turning it clockwise), and

confirm that the RF waveform loses parallel shape, then return
the SG1 guide to original position.  When the original
waveshape cannot be restored (Fig. 8), repeat steps 5 to 8.

(note)

  Do not adjust the SG1 and TG1 guides at the same

time.They must be testified and adjusted
independently.)
Be sure to complete adjustment of either one of the
guides, then start adjustment on the other guide.

15. Confirm that the waveform during the FWD mode is obtained

in the following modes.
Confirm also that the waveform in the FF/REW mode conforms
to the waveform shown in Fig. 9.
FWD 

→ 

STOP 

→ 

FWD 

→ 

CUE 

→ 

FWD 

→ 

REV 

→ 

FWD

→ 

STOP 

→ 

FF 

→ 

FWD 

→ 

STOP 

→ 

REW 

→ 

FWD 

→ 

STOP

→ 

EJECT 

→ 

FWD

• Confirmation of torque

Preparation:

Remove the cassette lid from the holder.

[

×

 1 FWD mode]

1.

Establish a test mode.

2.

Select and set a test mode code 40.

3.

Insert a torque meter TW-7131.

4.

Establish the 

× 

1 FWD mode by pressing the VOLUME 

+

 key.

5.

Observe and confirm the torque meter reading.

FWD takeup torque: 5 to 9 g•cm
FWD back tension: 3 to 6.5 g•cm

[

× 

1 REV mode]

1.

Establish a test mode.

2.

Select and set a test mode code 40.

3.

Insert a torque meter TW-7131.

4.

Establish the 

× 

1 REV mode by pressing the VOLUME 

−

 key.

5.

Observe and confirm the torque meter reading.
REV takeup torque: 5.5 to 8.5 g•cm
REV back tension:

11.5 to 17 g•cm

• Confirmation of T-reel lock

1.

Enter the test mode.

2.

Set the test mode code to 32 using the MODE key.  Then press
the ENTER key.

3.

Find the tape of a 120-minute tape.  Insert the tape to the
machine.

4.

Press the STOP key.  Confirm that any number of either 0, 1, 2,
3 or 4 appears in the display window when the EJECT key is
pressed.
If a number of 5 or higher appears, replace the Limiter (F reel)
Assy (X-3373-741-1) and check the T-reel lock again.

• Confirmation of speed
[Capstan FG]
1.

Connect a frequency counter to TP508 (CFG).

2.

Establish a test mode.

3.

Select and set the test mode code 40.

4.

Insert a test tape TY-30B.

5.

Establish the 

× 

0.5 FWD then 

× 

1 FWD modes by pressing the

VOLUME 

+

 key and take reading of frequency counter

respectively.

[Drum FG]
1.

Connect a frequency counter to TP507 (DFG).

2.

Establish a test mode.

3.

Select and set the test mode code 40.

4.

Insert a test tape TY-30B.

5.

Establish the 

× 

0.5 FWD then 

× 

1 FWD modes by pressing the

VOLUME 

+

 key and take reading of frequency counter

respectively.

• Voltage check
1.

Establish a test mode.

2.

Select and set the test mode code 40.

3.

Measure DC voltage at the respective test points using VOM
and confirm that the DC voltages satisfy the specifications.

• Switching pulse (SWP) adjustment

Note:

Be sure to perform the tape pass adjustment when rotary

drum is replaced.
Preparation: Oscilloscope

Frequency band width:
100 MHz or more
CH-1: AC 100 mV/DIV
CH-2: AC 2 V/DIV
0.2 msec/DIV
TRIG:CH-2

– 24 –

Mode

Frequency

×

 0.5FWD

311Hz 

±

 5Hz

×

 1FWD

622Hz 

±

 5Hz

Mode

Frequency

×

 0.5FWD

400Hz 

±

 1Hz

×

 1FWD

800Hz 

±

 1Hz

Test point

Specifications

REG3.5V (TP602)

3.5V

−

 3.5V (TP605)

−

 3.5V

MIC L (TP101)

1.9V 

±

 0.3V

MIC R (TP201)

1.9V 

±

 0.3V