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JVC HR-XVC22UC Service Manual Page 24

Dvd player & video cassette recorder.
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5.3.4 EMG content description
Note:
EMG contents "E09" are for the model with Dynamic Drum (DD).
FDP
E01: Loading EMG
If the mechanism mode does not change to the next mode within 4 sec-
onds after the loading motor starts rotating in the loading direction, while
the mechanism is in the after-loading position (with the tape up against
the pole base), [E:01] is identified and the power is switched OFF.
However, if the tape loading is not completed within 4 seconds after
the loading motor starts rotating in the loading direction, the tape is
simply unloaded and ejected. No EMG data is recorded in this case.
When the mechanism mode cannot be changed to another mode
E02: Unloading EMG
even when the loading motor has rotated for more than 4 sec-
onds in the unloading direction, [E:02] is identified and the power
is turned off.
When the falling edje of the take-up reel pulse has not been gen-
E03: Take Up Reel
erated for more than 4 seconds in the capstan rotating mode,
Pulse EMG
[E:03] is identified, the pinch rollers are turned off and stopped,
and the power is turned off. In this case, however, the mecha-
nism should be in position after tape loading. Note that the reel
EMG is not detected during Slow/Frame advance operations.
When the drum FG pulse has not been input for more than 3 sec-
E04: Drum FG EMG
onds in the drum rotating mode, [E:04] is identified, the pinch roll-
ers are turned off and stopped, and the power is turned off.
If the cassette does not reach the eject position within about 0.7
E05: Cassette Eject
seconds after the cassette housing has started the cassette ejec-
EMG
tion operation, [E:05] is identified, the drive direction is reversed
to load the tape, the mode is switched to STOP mode with the
pinch roller OFF, and the power is switched OFF.
During the cassette insertion process, the drive direction is reversed
and the cassette is ejected if the tape is not up against the pole
base within about 3 seconds after the start of the cassette pulling-
in operation. If the cassette does not reach the eject position within
about 0.7 seconds after the drive mode reversal operation, [E:05]
is identified and the power is switched OFF immediately.
E06: Capstan FG
When the capstan FG pulse has not been generated for more
EMG
than 1 second in the capstan rotating mode, [E:06] is identified,
the pinch rollers are turned off and stopped, and the power is
turned off.However, the capstan EMG is not detected in SLOW/
STILL modes.
Note that, if the part number of the System Control IC begins with
"MN" or "M3", the capstan EMG is not detected even during the
FF/REW operation.
When short-circuiting of the SW power supply with GND has lasted
E07: SW Power
for 0.5 second or more, [E:07] is identified, all the motors are
Short-Circuit
stopped and the power is turned off.
EMG
When communication with a system computer of VHS side is not
E08: DVD EMG
carried out because of the defective DVD unit, or when the DVD
unit must be reset
When the DD FG pulse is not generated within 2.5 seconds, [E:09]
E09: DD FG EMG
is identified, the tilt motor is stopped and the power is turned off.
When the falling edge of the supply reel pulse has not been gen-
E0A: Supply Reel
erated for more than 10 seconds in the capstan rotating mode,
Pulse EMG
[E:0A] is identified and the cassette is ejected (but the power is
not turned off). In this case, however, the mechanism should be
in the position after tape loading (with the tape up against the pole
base). Also note that the reel EMG is not detected during Slow/
Frame advance operations.
Presupposing the presence of the control pulse output in the PLAY mode, when the value obtained by mixing the two V.FM output channels (without regard
EU1:
to the A.FM output) has remained below a certain threshold level for more than 10 seconds, [E:U1] is identified and recorded in the emergency history.
Head clog warning
During the period in which the head clog is detected, the FDP shows "U:01" and the OSD repeats the "3 seconds of warning display" and the "7 seconds of
history
noise picture display" alternately.
EMG code : "E:C1" or "E:U1" / FDP : "U:01" / OSD : "Try cleaning tape." or "Use cleaning cassette."
The head clog warning is reset when the above-mentioned threshold has been exceeded for more than 2 seconds or the mode is changed to another mode
than PLAY.
1-24 (No.YD008)
CONTENT
1. The mechanism is locked in the middle of the mode transition during a tape loading operation.
2. The mechanism overruns during the tape loading operation because the SYSCON cannot recognize
3. Power is not supplied to the loading MDA. (M12V/Vcc/Vref/ICP are disconnected in the middle.)
1. The mechanism is locked in the middle of mode transition.
2. Without an eject signal being sent from the SYSCON, unloading is attempted (i.e. Ejection is attempted
3. Power is not supplied to the loading MDA. (M12V/Vcc/Vref/ICP are disconnected in the middle.)
1. The take-up reel pulse is not generated in the FWD transport modes (PLAY/FWD SEARCH/FF,
2. The supply reel pulse is not generated in the REV transport modes (REV SEARCH/REW, etc.)
3. Power(SW5V) is not supplied to the reel sensor on the tape winding side.
1. The drum could not start or the drum rotation has stopped due to too large a load on the tape,
2. The drum FG pulse did not reach the System controller CPU because;
3. The drum control voltage (DRUM CTL V) is not supplied to the MDA.
4. Power (M12V) is not supplied to the drum MDA.
1. The cassette cannot be ejected due to a failure in the drive mechanism of the housing.
2. When the housing load increases during ejection, the loading motor is stopped because of lack of
3. The sensor/switch for detecting the end of ejection are not functioning normally.
4. The loading motor drive voltage is lower than specified or power (M12V) is not supplied to the
5. When the user attempted to eject a cassette, a foreign object (or perhaps the user's hand) was
1. The capstan could not start or the capstan rotation has stopped due to too large a load on the tape,
2. The capstan FG pulse did not reach the System controller CPU because;
3. The capstan control voltage (CAPSTAN CTL V) is not supplied to the MDA.
4. Power (M12V, SW5V) are not supplied to the capstan MDA.
1. The SW 5 V power supply circuit is shorted with GND.
2. The SW 12 V power supply circuit is shorted with GND.
1. The DVD unit is defective.
2. Contact failure of the wires in the DVD unit or VHS side.
1. The FG sensor is defective. (The soldered parts have separated.)
2. The pull-up resistor at the FG sensor output is defective. (The soldered parts have separated.)
3. Contact failure or soldering failure of the pins of the connector (board-to-board) to the FG sensor.
4. The power (5V) to the sensor is not supplied. (Connection failure/soldering failure)
5. The FG pulse is not sent to the System Controller CPU.
6. The tilt motor is defective. (The soldered parts have separated.)
7. The drive power to the tilt motor is not supplied. (Connection failure/soldering failure)
8. The tilt motor drive MDA - IC is defective.
9. Auto-recovery of the DD tilting cannot take place due to overrun.
1. The supply reel pulse is not generated in the FWD transport mode (PLAY/FWD SEARCH/FF,
2. The take-up reel pulse is not generated in the REV transport mode (REV SEARCH/REW, etc.).
3. The power (SW 5V) to a reel sensor is not supplied.
CAUSE
the mechanism mode normally. This problem is due to a cause such as a rotary encoder failure.
while the tape is still inside the mechanism.) because the SYSCON cannot recognize the mechanism
mode normally. This is due to a cause such as a rotary encoder failure. (Mechanism position:
UPPER)
etc.) because;
1) The idler gear is not meshed with the take-up reel gear because the mechanism mal-functions for
some reason.
2) The idler gear is meshed with the take-up reel gear, but incapable of winding due to too large
mechanical load (abnormal tension);
3) The reel is rotating normally but an FG pulse is not generated due to the take-up reel sensor failure.
because;
1) The idler gear is not meshed with the supply reel gear because the mechanism mal-functions for
some reason.
2) The idler gear is meshed with the supply reel gear, but incapable of winding due to too large a
mechanical load (abnormal tension);
3) The reel rotates normally but the FG pulse is not generated due to a supply reel sensor failure.
because;
1) The tape tension is abnormally high;
2) The tape is damaged or a foreign object (grease, etc.) adheres to the tape.
1) The signal circuit is disconnected in the middle;
2) The FG pulse generator (hall device) of the drum is faulty.
headroom in its drive torque.
Housing load increasing factors: Temperature environment (low temperature, etc.), mechanism
wear or failure.
motor (MDA).
caught in the opening of the housing.
because;
1) The tape tension is abnormally high (mechanical lock);
2) The tape is damaged or a foreign object (grease, etc.) is adhered to the tape (occurrence of tape
entangling, etc.).
1) The signal circuit is disconnected in the middle;
2) The FG pulse generator (MR device) of the capstans is faulty.
etc.) because;
1) PLAY/FWD or SEARCH/FF is started while the tape in the inserted cassette is cut in the middle;
2) A mechanical factor caused tape slack inside and outside the supply reel side of the cassette shell.
In this case, the supply reel will not rotate until the tape slack is removed by the FWD transport,
so the pulse is not generated until then;
3) The reel is rotating normally but the FG pulse is not generated due to a supply reel sensor failure.
1) REV SEARCH/REW is started when the tape in the inserted cassette has been cut in the middle;
2) A mechanical factor caused tape slack inside and outside the take-up reel side of the cassette
shell. In this case, the take up will not rotate until the tape slack is removed by the REV transport,
so the pulse will not be generated until that time;
3) The reel is rotating normally but the FG pulse is not generated due to a take-up reel sensor failure.

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