Kenwood KMD-300, KMD-300GD2 Service Manual

MD CHANGER

KMD-300/GD2

SERVICE MANUAL

© 2003-11 CREATED IN JAPAN B53-0110-00 (N) 0

Audi GENUINE

GENUINE PARTS No.

Hardware	4E0	035 121 41
Software	4E0	910 121 0001 300

Panel assy (A64-2691-12)

Audi md changer

How to Take the Panel Assembly Off

1) Take the sheet (A) off.		A
2) Remove screw (B).
		B
3) While pressing on the hook (C), take the panel		C
assembly off.
	C	C

B

C

BOTTOM

C

C

2

J1	(X14-6912-70)	(A/2)
G&H
GND	1
BU+12V	2
ID-X	3
ID-Y	4
DIAG	5
	6
	7
	8

IC3 6.5V IC2 5V DIG.

IC1 5V CONT.

	MECHA CONNECTOR									CN100
	30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10	9	8	7	6	5	4	3	2
										1
	S +6.5V
										MCLK(22.5792MHz)
									D.AUDIO(IEC60958)
	M-BU+5V
	D+5V
	A+5V
	BU+5V

(X25-9252-70)

IC30

BU. DET.

IC31

SW to

POW

Q41-43

DIAG

CIRCUIT

	PON	10
	LEV6V
	LEV16V
	SW to POW
IC32-34
POWER	STATUS
ON
	HOLD
LOGIC
	DIAG IN
	DIAG OUT
	PINX
	PINY

(X14- ) (B/2)
											D+5V
	LEDEJECT	LEDDISC1	LEDDISC2	LEDDISC3	LEDGUIDE	LEDLOAD	DISC1SW	DISC2SW	DISC3SW	EJECTSW	6
											LOADSW
											5
Q60-66
		LED DRIVER
											BU+5V

STATUS

IC1

3.3V

PON LEV6V SW to PWR LEV16V STATUS HOLD DIAGIN DIAGOUT PINX PINY

IC90
WDTIMER
	IC30
WDTN	RESET
H8S2626
u-COM

LED EJECT
LED DISC1
LED DISC2	DISC1SW	DISC2SW	DISC3SW	EJECTSW	LOADSW	CLEAR	ATTOPT
LED DISC3
LED GUIDE
LED LOAD

		IC70
	SW EJECT	KEY
	SW LOAD
		HOLD

IC150
DIR
		IC151
DATAIN LRCIN	CIN	CL LRCL
OS8104
MOST
TRANCEIVER

OPT ATT.

IC91

EEPROM

	J180
	MOST
	PIGTAIL
8	RX
7	STATUS
6	GND
5	BU+5V
4	ATT
3	D+5V
2	GND
1	TX

300/GD2-KMD DIAGRAM BLOCK

KMD-300/GD2

COMPONENTS DESCRIPTION

● DISPLAY UNIT (X14-6912-70)

Ref. No.	Application/Function	Operation /Condition/Compatibility
IC1	Stabilized power supply	Supplies Bu +5V to IC30, IC31, IC32, IC33, IC34, etc.
IC2	Stabilized power supply	Supplies D.+5V to X25 board
IC3	Stabilized power supply	Supplies +6.5V to mechanism X33
IC30	Reset IC	OUT=H when BU+5V is above 4.2V
IC31	1 pulse oscillation	Oscillates 1 pulse at rise of BU
IC32	NOT circuit	((~STATUS | | DIAG | | Sw to Pow) &&-LEV6) | | HOLD=H, then D.+5V ON
IC33	OR circuit	((~STATUS | | DIAG | | Sw to Pow) &&-LEV6) | | HOLD=H, then D.+5V ON
IC34	D flip-flop	Detects downward slope of J1 DIAG
Q1	Switch	Q1 base =L, then LEV16=12V
Q2	NOT circuit	Q2 base =H, then Q1 base =L
Q40	NOT circuit	J1 DIAG=L, then IC33 A3 input=H
Q41	NOT circuit	CN1 DIAGOUT=H, then J1 DIAG=L
Q42	Excess current protection	Limit Q41 emitter current
Q43	NOT circuit	J1 DIAG=L, then CN1 DIAGIN=H
Q60	Switch	CN2 LED1=H, then D60 lights up.
Q61	Switch	CN2 LED2=H, then D61 lights up.
Q62	Switch	CN2 LED3=H, then D62 lights up.
Q63	Switch	CN2 LED4=H, then D63 lights up.
Q64	Switch	CN2 LED5=H, then D64 lights up.
Q65	Switch	CN2 LED6=H, then D65 lights up.
Q66	Switch	CN2 LED6=H, then D66 lights up.

● ELECTRIC UNIT (X25-9252-70)

Ref. No.	Application/Function	Operation /Condition/Compatibility
IC1	Stabilized power supply	Supplies 3.3V to IC30 and IC150.
IC30	-com	Controls various sections of the set.
IC70	D flip-flop	Detects rise of key input for LOAD/EJECT
IC71	NAND circuit	IC70 CLR=~ (IC90 RESET&&IC30 CLEAR)
IC90	RESET IC	D+5V is above 4.2V, then RESET=H.
IC91	EEPROM	Saves backup data.
IC150	DIR	Converts IEC60958 (SPDIF) signal to 3-line serial.
IC151	MOST transceiver	Signal processing IC for optical input/output
Q30	Switch	PF3=L, then AVREF ON.
Q70	NOT circuit	CN70 EJECT=H, then IC30 EJECT=L
Q71	NOT circuit	CN70 LOAD=H, then IC30 LOAD=L
Q180	NOT circuit	MOST ATT=H, then Q181 base=L
Q181	Switch	MOST ATT=H, then increase optical output.

3

KMD-300/GD2

MICROCOMPUTER’S TERMINAL DESCRIPTION

● MICROCOMPUTER : HD64F2626FA20I (X25 : IC30)

Pin No.	Pin Name	I/O	Application
1	ATT	O	MOST TX attenuate
2	MOST_INT	I	MOST data reception interrupt
3	BEEP	O	BEEP output
4	ERROR	I	MOST error signal
5	DIR_CS	O	DIR CS
6	VCC1
7	HTxD
8	VSS1
9	HRxD
10	MMUTE	I	Mechanism mute detection
11	SS1_SW	I	Stock1 Detection of disk/No disk SW
12	SS2_SW	I	Stock2 Detection of disk/No disk SW
13	SS3_SW	I	Stock3 Detection of disk/No disk SW
14	MS_SW	I	EJECT complete detection SW
15	VSS2
16	FS_SW	I	LOAD start detection SW
17	PVCC1
18	OS_SW	I	Wrong direction detection SW
19	NC
20	MSTOP	O	Mechanism control Wake Up
21	MRST	O	Mechanism control RESET
22	M0	O	M1, M2, M3 control output
23	M1	O	LO/EJ control output
24	M2	O	Mechanism roller attach control output
25	M3	O	Mechanism rising order control output
26	NC
27	NC
28	MSDA	I/O	Mechanism I2C data
29	MSCL	I/O	Mechanism I2C clock
30	DIR_ERR	I	DIR error
31	DIR_TX	O	DIR control output
32	DIR_RX	I	DIR control input
33	DIR_CLK	O	DIR clock
34	SDA	I/O	MOST I2C data
35	SCL	I/O	MOST I2C clock
36	LED1	O	MD1 eject SW LED
37	VSS3
38	LED2	O	MD2 eject SW LED
39	PVCC2
40	LED3	O	MD3 eject SW LED
41	LED4	O	Load SW LED
42	LED5	O	Eject SW LED
43	LED6	O	Insert slot LED
44	CLEAR	O	Hard key buffer clear
45	MOST_WRITE
46	NC
47	TXD	O	Flash writer data output
48	RXD	I	Flash writer data input
49	NC
50	OSC1

4

KMD-300/GD2

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No.	Pin Name	I/O	Application
51	OSC2
52	PVCC3
53	MD0
54	VSS4
55	MD1	I	-com mode switching
56	MD2	I	-com mode switching
57	PLLVSS
58	PLLCAP
59	PLLVCC
60	RES	I	-com resetting
61	NMI
62	STBY
63	VCC2
64	XTAL
65	VSS5
66	EXTAL
67	FEW	I	Flash write enable
68	NC
69	PON	O	Peripheral circuit power supply control
70	SA_SW	O	SA switch
71	HOLD_SW	O	SD switch
72	LPSCO	O	Vref control
73	WDT_OFF	O	Watch dog timer count output
74	DIAG_OUT	O	DIAG output
75	DIAG_IN	I	DIAG input
76	AVCC
77	Vref	I	Reference voltage input
78	MLPS	I	Mechanism location position detection
79	PS_SW	I	Play position detection of disk/No disk SW
80	LS_SW	I	Load complete SW
81	CS_SW	I	roller attach/detach SW
82	BU_DET	I	Power supply +B input
83	LEV16	I	Power supply voltage detection
84	NC
85	LEV_6	I	Power supply voltage <6V
86	DISK1	I	MD1 select SW
87	DISK2	I	MD2 select SW
88	DISK3	I	MD3 select SW
89	LOAD	I	LOAD SW
90	EJECT	I	Eject SW
91	SW_TO_PW	I	Power supply control
92	ID-X	I	Unit position detection
93	ID-Y	I	Unit position detection
94	AVSS
95	VSS6
96	WDTOVFA
97	PVCC4
98	NC
99	STATUS		MOST status
100	MOST_RST		MOST reset

5

KMD-300/GD2

TEST MODE

1. TEST MODE

MDC possesses test mode functions for production purposes. There are three test modes: production line test mode, mechanism operation test mode, and shipping mode. As shown in Figure 1, it is possible by using the keys to shift to each of these modes.

		Automatic
		mechanism
		mode
Normal		Test mode
Operation
		for
Mode
		mechanism
		operation
e, w, q		Manual
Start		mechanism
		mode
q+e	q, w,
Test Mode	e	Production
selection		line
mode		Test Mode

q, q, q

Shipping

mode

1.1.2 How to exit the Test Mode selection mode

The following are ways to move out of the Test Mode selection mode. The operation after exiting the mode will be the same as after hardware resetting. The unit must be reset in the final stage of the Test Mode.

1.By resetting the system

2.By changing MOST Tx=On to MOST Tx=Off

3.By a momentary power outage

4.After entering this mode, when there is no effective key input for ten or more seconds

5.After entering this mode, when there is no ineffective key input

1.1.3 Initial condition after entering the Test Mode

The q, w, e, LOAD, and UNLOAD keys have LED’s (red and red only) installed.

Also, one LED (red and red only) is placed on each side of the disk insertion slot.

When the Test Mode selection mode is entered, all LED’s light up.

Figure 1 Test Mode conditioned flowchart

1.1. Test Mode selection mode

In this unit, there are but five keys: LOAD, UNLOAD, q (DISC SELECT LEFT KEY), w (DISC SELECT CENTER KEY), and e (DISC SELECT RIGHT KEY). After installation of the unit by the user, if direct switching to the Test Mode were enabled by combining these five keys, it is possible to shift accidentally into the Test Mode. This is because of the simplicity of the input method.

To avoid this problem, use Test Mode selection. This mode condition is achieved by enabling key input during the Test Mode. In other words, no direct switching to the Test Mode is done. This Test Mode selection mode prevents the user from entering the Test Mode inadvertently.

1.1.1 How to enter the Test Mode selection mode

With the MOST Tx Output (Light) on, by simultaneously depressing the q and e keys and by resetting or turning the power on, Test Mode selection mode is achieved.

Or with the MOST Tx Output (Light) off, by simultaneously depressing the q, e, and LOAD keys and resetting or turning the power on, the Test Mode selection mode is also achieved.

1.2. Shipping Mode

When transporting MD Changer units, their mechanisms are subject to vibrations and shocks. These could damage the MD Changer mechanisms (including the servo system and pickup). Therefore, before transporting the units, it is necessary to place the mechanisms in positions that are most vibration and shock resistant. The Shipping Mode causes the mechanism to shift into ideal, optimally robust shipping positions.

1.2.1 How to enter the Shipping Mode

In the Test Mode selection mode with no disk in the unit, the selection mode can be entered by pressing the q key three times.

1.2.2 How to exit the Shipping Mode

By resetting the system or by turning on the power, the Shipping Mode is released and the mechanism returns to its initial position.

Accordingly, after confirming that the mechanism has entered the Shipping Mode, the power should be turned off.

Table 1 MD Changer (Shipping Mode) Key description

Key Mode Description

#1 #1 #1 MD Changer Mechanism are put into shipping position.

6

KMD-300/GD2

TEST MODE

Table 2 Flow of MD Changer Conditions (Shipping Position)

	Disk	MD Changer Condition	Display
	Condition
	Out	Receiving signal to shift	#1 blinks with 500ms
		to shipping position	interval
		Shifting	#1 blinks with 500ms
			interval
		Shifting successfully	#1 lights up
		completed.
		Shifting unsuccessful	#1, #2, and #3 blink
			at 500ms intervals
	In	Ineffective (any one of the
		switches of the mechanism
		is on).

1.3. Production Line Test Mode

1.3.1 How to enter the production line Test Mode

In the Test Mode selection mode, with LED’s for the q, w, and e keys alight, it is possible to enter the production line Test Mode by consecutively pressing the q, w, and e keys. As these inputs are made, each LED on these keys lights up, enabling key input confirmation. Also, when the production line Test Mode is entered by effective key input, the LED’s that had remained unlit light up.

If incorrect keys were pressed or no effective key input were made for ten consecutive seconds, the Test Mode selection mode is released. In this case the Test Mode selection mode must be reentered to enable Test Mode entry.

1.3.2 How to enter the production line Test Mode

The following are ways to release the production line Test Mode selection mode. Ideally, the condition after exiting the Test Mode should be the same as after resetting the hardware by means of the program. This, however, cannot always be achieved at present.

Accordingly, it is necessary to reset the system in the final process of the Test Mode. (This excludes the case of setting the mechanism to transport position.)

1.By resetting the system

2.By changing MOST Tx=On to MOST Tx=Off

3.After entering the Test Mode, when an ineffective key was pressed

1.3.3 Initial condition in the production line Test Mode

In the Test Mode, there is no special initial setting. (This is other than the initial setting of normal units.) To indicate, however, that the Test Mode has been entered, all LED’s on the q, w, and e keys will light up.

1.3.4 Display (LED)

LED installation on the q, w, and e keys can be checked. With all disks removed, press any of the q, w, or e keys and lift your finger within one second. This causes the LED corresponding to the pressed key to go from “off” to “lighting up” to “blinking,” and to “off.”

When and if a disk or disks are present, the LED will light up according to the disk condition. (The condition according to normal operational specifications will follow.)

Inasmuch as the LED’s are also used for judging key input, no judgment results when there is a key-input problem. Accordingly, if no judgment were possible, a disk must be inserted into the desired position and appropriate key input made. Confirm that disk ejection is possible.

1.3.5 Keys

To ensure that the conductance of the q, w, e, LOAD, and UNLOAD keys is satisfactory, with all disks removed, press any of the q, w, e, LOAD, and UNLOAD keys and lift your finger within one second. Then confirm that the LED corresponding to the pressed key will proceed from “off” to “lighting up” to “blinking,” and to “off.”

Inasmuch as this is the same as evaluating the display (LED’s), if a problem exists with the LED, no evaluation can be conducted.

Accordingly, if no evaluation were possible, a disk must be placed into the desired position and appropriate key input made. Be sure that the disk can be ejected.

When and if the q, w, and e keys are depressed for more than one second, the Stock and Stock Position Confirmation Modes will be entered, as described below.

1.3.6 MD servo

After disk-loading, playing starts at Track No. 7.

The following key operations are begun by commands from the control unit and are conducted only when the source is the MD Changer.

Even when the playing track number is changed other than by the keys (commands) described below, the playing condition will persist.

1.3.7 Mechanism transport position

Refer to “1.2 Shipping Mode.”

To enter this mode, press the q key and hold it down one or more seconds.

7

KMD-300/GD2

TEST MODE

1.4 Test mode for MD Changer mechanism opera-

tion

1.4.1How to enter the Test Mode for MD Changer mechanism operation

After selecting the Test Mode selection mode, while the LED’s for the q, w, and e keys are lighting up, consecutively press the q, w, and e keys. The Test Mode for MD Changer mechanism operation can then be entered.

During key input, the LED corresponding to the key goes out, enabling key input confirmation.

After effective key input, when the Test Mode for the MD Changer mechanism operation is entered, all unlit LED’s will light up.

In case of an error in key input, or no effective key input were conducted for ten or more consecutive seconds, the Test Mode selection mode is released. It is then necessary to restart from the setting for the Test Mode selection mode.

Table 3 Test Mode input procedure for MD Changer mechanism operation

	Procedure		Key (result) /
		Status and Operation	LED (● light up)
	and result
			q	w	e
	1	In Test Mode selection mode	-	-	-
			●	●	●
	2	e key input	7	7	3
			●	●	K
	3	w key input	7	4	7
			●	K	K
	4	q key input	5	7	7
			K	K	K
	5	Test Mode for MD Changer	-	-	-
		mechanism operation
			●	●	●
	6	Elapse of ten seconds	7	7	7
			K	K	K
	7	Release of the Test Mode	-	-	-
		selection mode
			K	K	K

1.4.2Releasing the Test Mode for MD Changer mechanism operation

The following methods release the Test Mode for MD Changer mechanism operation. Ideally, the condition after exiting the Test Mode should be the same as after resetting the hardware by means of the program. This, however, cannot always be achieved at present Below are ways to release the production line Test Mode selection mode.

The system must always be reset after the final process in the Test Mode. When, however, desiring to enter the transport position, simply shut off the power after confirming that the mechanism will shift into the transport position. Remember that, when resetting after shifting into the transport position, the unit will return to the initial position.

1.By resetting the system

2.After setting this mode, no effective key input is made for ten seconds.

3.After entering the Test Mode, an ineffective key was pressed.

1.4.3 Initial condition of the Test Mode for MD Changer

mechanism operation

There is no special initial setting in the Test Mode. Nevertheless, to indicate that the Test Mode has been entered, all LED's installed on theq, w, and e keys will light up.

8

1

2

3

4

5

6

7

A			B				C		D		E
PC BOARD									KMD-300/GD2
(COMPONENT SIDE VIEW)								(FOIL SIDE VIEW)
	ELECTRIC UNIT X25-9252-70 (J74-1528-12)							ELECTRIC UNIT X25-9252-70 (J74-1528-12)

12 2

CN130

C185

8

1

L157

C181

J180

C182

R158 5

4R172

R180

L154

C165

1

L153

R155

EB

C166

3

C187

R181

Q181

IC152

11

1

L152

Q180

12

44

BE

CN1

C7

C167

R171

CP2

C8

C169

IC151

R168

R169

R170

C9

C168

2

1

C11

C10

22

34

CP1

C12

X150

C172

23

C173

R167

33

C13

R165

C14

R163

28

R154

C178

C160

R1

C15

1

C177

L156

L1

C170

R164

C174

L3

R153

C159

C1

C6

IC150

CP151

C2

14

R150

15 L151

L150

L155

G

I O

48C19

47

R151

IC1

CP150

C17

D91

5

4

C90

IC91

8

1

9

8

C93

C30

R91

IC90

R92

D34

C31

W90

16

1

R43

C94

R44

D30

D31

C38

C37

R35

R54

L30

R45

W31

C44

R47

R46

R41

R40

R38

R36

R34

R33

C46

C45

CP31

R48

51

50

26

25

C49

X30

IC30

C50

75

1 R62

R52

R51

76

CP34

100

R131

C53

R133

CP32

R57

R58

R59

R60

R61

C131

R135

11 1

R130

CP130

R132

1

14

BE

C133

D32

D33 Q30

IC70

R56

C54

R134

7

8

CP33

D72

L71

1

L72

L73

			C100
C102
		59	60
CP103	C125
	C123
CP101CP102	C121
	C119
	C117
	C115
CP100	C113
	R103
	C111
R102	L103	C105
R100
R101
		1	2
	L102	W100	CN100
L70
C82
CN70			14

C184

C189

C188

L183

C186

L182

C183

C180

C164

C163

R182

L181

L180

C161

R173

R156

R159

C162

R157

W152

R162

C171

W154

C175

C176

R166

D150

C3

W2

C5

C151

L2

C4

L160

C150

C157

D1

R2

L158

C153

C154

C18

C16

L159

C156

C95

R93

R90

R94

L100

C96

C91

D90

C101

L101

C92

C103

R30

R31

C126

C124

C41

C122

C120

C36

R37

R39

C43

C118

C116

C42

C39

R49

R42

C114

C40

C112

C35

C34

R50

C48

C109

C47

C110

C108

C32

C33

R53

C107

C106

R32

C55

C56

C52

R55

C104

							C51
		C84		C85
		C88
		C87
IC71	1		5
	3		4
C80	C81				Q70
C78	C79
C76	C77				D71
C74	C75
C73	C72				Q71
C70	C71

C139

C137

C135

C140

C132

C134

C138 R71 C136 C86 L130

C130

E B						D70
				R70
E B				C83

X25-9252-70						X25-9252-70
IC	Q	Address	IC	Q	Address
							IC	Q	Address
1		4B	151		3B
							71		6D
30		5B	152		2A
								70	6D
70		6A		30	5B
								71	6D
90		4B		180	3B
91		4B		181	2B
150		3A				Refer to the schematic diagram for the values of resistors and capacitors.

9