JVC GR-DVM90U Service Manual Download

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1. The CAPSTAN FG signal is not received by the syscon

CPU.
1) Disconnection in the middle of the signal line.
2) Failure of the CAPSTAN FG pulse generator (MR

element).

2. No capstan control voltage is supplied to the MDA.
3. No power is supplied to the CAPSTAN MDA.
4. The capstan cannot be started or capstan rotation is

stopped because tape transport load is too high.
1) Tape tension is extremely high. (Mechanical lock-

ing)

2) The tape is damaged or soiled with grease, etc.

(Tape tangling occurs, etc.)

1.9 EMERGENCY DISPLAY

Whenever some abnormal signal is input to the syscon CPU,
an error number (E01, as an example) is displayed on the
LCD monitor or (in the electronic view finder).
In every error status, such the message as shown below
alternately appear over and over.

•

In an emergency mode, all operations except turning on/
off the POWER switch are ineffectual.

@ @ @ @

E01

UNIT IN

SAFEGUARD MODE

E01

REMOVE AND

REATTACH BATTERY

Example (in case of the error number E01):

E01

LCD

display

Emergency

mode

Details

Possible cause

In the case the encoder position is not shifted
to the next point though the loading motor has
rotated in the loading direction for 4 seconds
or more. This error is defined as [E01].

1. The mechanism is locked during mode shift.
2. The mechanism is locked at the mechanism loading

end, because the encoder position is skipped during
mechanism mode shift.

3. No power is supplied to the loading MDA.

E02

UNLOADING

In the case the encoder position is not shifted
to the next point though the loading motor has
rotated in the unloading direction for 4 seconds
or more. This error is defined as [E02].

1. The mechanism is locked during mode shift.
2. The mechanism is locked at the mechanism loading

end, because the encoder position is skipped during
mechanism mode shift.

E03

TU & SUP REEL
FG

In the case no REEL FG is produced for 4 sec-
onds or more in the capstan rotation mode af-
ter loading was complete, the mechanism mode
is shifted to STOP with the pinch roller set off.
This error is defined as [E03].
However, no REEL EMG is detected in the
SLOW/STILL mode.

1. The idler gear does not engage with the reel disk well.
2. Though the idler gear and reel disk are engaged with

each other, the tape is not wound because of over-
load to the mechanism.

3. No FG pulse is output from the reel sensor.
4. No power is supplied to the reel sensor.
5. Tape transport operation takes place with a cassette

having no tape inside.

6. The tape slackens and no pulse is produced until the

slack is taken up and the tape comes into the normal
status.

E04

DRUM FG

In the case there is no DRUM FG input in the
drum rotation mode for 4 seconds or more. This
error is defined as [E04], and the mechanism
mode is shifted to STOP with the pinch roller
set off.

1. The drum cannot be started or drum rotation is stopped

because tape transport load is too high.
1) Tape tension is extremely high.
2) The tape is damaged or soiled with grease, etc.

2. The DRUM FG signal is not received by the syscon

CPU.
1) Disconnection in the middle of the signal line.
2) Failure of the DRUM FG pulse generator (hall ele-

ment).

3. No drum control voltage is supplied to the MDA.
4. No power is supplied to the DRUM MDA.

E05

–

E06

CAPSTAN FG

In the case no CAPSTAN FG is produced in
the capstan rotation mode for 2 seconds or
more. This error is defined as [E06], and the
mechanism mode is shifted to STOP with the
pinch roller set off.
However, no CAPSTAN EMG is detected in the
STILL/FF/REW mode.

(DVC_03)

Table 1-9-1