Kenwood MDX-F1 Service Manual page 10

MDX-F1
7-4-4 MD SECTION
1. Preparation for Adjustment(MD-2)
You have to carry out the following test mode items if replace MD mechanism, pickup, head and pc board.
1-1 Procedure
1. Short-circuit #4(vss) and #7(wp) of IC1402(EEPROM).
2. Set the unit to test mode and carry out the every adjustment in test mode.
3. Stop the test mode by pressing the STOP key for 3 secs
4. Remove the short circuit of IC1402. Carry out reset start.
Temperature
Repair(replace)
Standard Set
pickup
recording head
mechanism
pcb parts
MD microprocessor
MD LSI
RF iC
EEPROM
note: figures order of steps. - = no need.
* Result of EEPROM
OK_EEPROM
WR_EEPROM
NG_EEPROM
** Carry out the TEST-PLAY , TEST-REC and C1 error in test mode after AUTO_ADJ and AUTO_FAB.
1-2 Test disc
Type
1 High reflection disc
2 Low reflection disc
3
2. Test mode
Test mode setting method
1. Holding down the SET button and turn power on.
(State A )
2. Insert the playback disc 1 (high reflection disc) or recording disc 2 (low reflection disc).
(During disc loading : display LOADING)
Thus, the test mode state is set.
A MD
TEST
B AUT
YOBI
tsm e
C
TEST STOP state
Entering the specific mode
Whenever the MD REC
AUTO pre-adjustment
(AUT YOBI)
EEPROM setting
(EEPROM SET)
10
CIRCUIT DESCRIPTION
EEPROM set
Auto pre adj
value check
TEMP EEPROM_SET AUTO_YOBI AUTO_ADJ AUTO_FAB CANCEL TEST MODE TEST-PLAY TEST-REC
- 1
- -
- 1
1 2
- 1
- -
1 2
1 2
Write the data of setting values and AUTO-pre adjustment perfectly.
Write the data of setting values perfectly however not write AUTO pre-adjustment.
Carry out AUTO-pre adjustment and write data to EEPROM.
Not write the data of setting values.
Check the connection of MD microprocessor and EEPROM.
Test disc
TGYS1 (SONY)
Recording minidisc
Head Adjusting transparent
(State B is set.)
: TEST MODE
(When the
is restored. To restore B again, press the MD REC button.)
button is pressed, the mode is changed.
AUTO adjustment
(AUTO AJST)
MANUAL adjustment
(MNU AJST)
Auto adj Auto Fab adj *EEPROM data write
2 3 4
- - -
2 3 4
3 4 5
- - -
1 2 3
3 4 5
3 4 5
represents version of MD microcomputer.
(STOP) button is ressed in the A state, the indication C
AUT RESULT SUB
(AUT FAB) (RST YOBI)
MANUAL pre-adjustment
(MNU YOBI)
** Operation check
5 6
- -
5 6
6 7
2 3
4 5
6 7
6 7
RESULT
(RESULT)
7
1
7
8
4
6
8
8