MD-MT20/20C/20W
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52 EXPORT0 LDCNT1 Output Recording head raising-lowering control output 1 See the separate table *3.
53 EXPORT1 LDCNT2 Output Recording head raising-lowering control output 2 See the separate table *3.
54 EXPORT2 — Output Not used. (Open)
55 EXPORT3 EMPH1 Output Audio emphasis control output 1 See the separate table *2.
56 EXPORT4 DCNT Output Mechanism driver enable output 'H': Driver operation ON
57 EXPORT5 OPTCNT Output Optical digital input circuit control 'H': Circuit operation ON
58 EXPORT6 DAPON Output D/A converter operation control output 'H': Operation ON
59 EXPORT7 ADPON Output A/D converter operation control output 'H': Operation ON
System LSI expansion output port (6th generation: LR37811)
Pin No.
Function
Port Name
Terminal Name Input/Output
Remarks
H H Normal mode
H L No adjustment mode
L H Test mode
L L (Settings prohibited)
TEST1
Details
*1: List of TEST port settings
H H fs=32K: 'ON'
H L fs=48K: 'ON'
L H OFF
L L fs=44.1K: 'ON'
EMPH1 EMPH0
Details
*2: List of EMPH port settings
H H Brake
H L Drive UP
L H Drive DOWN
L L Output OFF
LDCNT1 LDCNT0
Details
*3: List of LDCNT port settings
TEST0
IC401 RH-iX0298AWZZ: System Microcomputer (IX0298AW) (3/3)
Charging control works as shown below.
Charging is performed in the following three modes.
Initial charging -> Main charging Supplementary charging -> Finish
The details are shown below.
The current value is measured by voltage on both ends of R250/R251.
CIRCUIT DESCRIPTION
Initial charging
The charging current is approx. 250 mA. The initial charging time varies depending on the battery condition. The charging time may
be more than five minutes, depending on the initial battery condition. If the battery voltage is below 2.0 V (or over 3.75 V) after two
minutes, the charging mode is cancelled. When the battery voltage is over 2.0 V and less than 3.75 V after five minutes, the main
charging mode is selected.
Main charging
The charging current is approx. 375 mA. The main charging time varies depending on the battery condition.
<Main charging stop mode>
When the full-charge check is performed, the output of pin 51 is pulled H and the voltage is measured at five minute intervals (eight
separate voltage measurements should be made to get a mean voltage value for consideration). The voltage value is read 500 msec
after the output of pin 51 (battery voltage detection gain select output) is pulled H.
The current reading is compared with the reading taken 30 minutes before and one of three judgements is given: Same, Higher or
Lower.
The voltage drop is detected, and the charging is stopped.
When battery voltage is over 2.8 V, a full-charge check will be performed (when it is below 2.8 V, the full-charge check will not be
conducted).
When the battery voltage is not over 2.8 V, the initial charging mode is not changed to the main charging mode.
It may be more than five minutes before the battery voltage exceeds 2.8 V.
(The initial charging time varies depending on the battery condition.)
Supplementary charging
The supplementary charging mode (charging current: 250 A) will be engaged using the following specifications, depending on the
main charging mode.
After the main charging is completed, the battery is charged for about two hours at a current of 250 mA, and then the charging mode
is cancelled.
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