HP LaserJet Pro 400 manual 155

7 6 5 4 3 2 1

tools 129

+3.3VA

R60

(ASIC-8p)

PLLENBL

3.3K,0.063W

1

2

(A505)

PFULLS

(A505)

POUTS

1

NF101

R10

(A505)

FSRPRSS

2

(ASIC-6p)

ASICCLK

430,0.1W

3

1

FB 2

21

2

C69

2

C74

(A503)

TNRRSPWM

4

100P,50V/NOTMNT

(A504)

RDSLED

5

1

1

100P,50V/NOTMNT

ITBLLED

6

(A504)

R49

RDSGAIN0

100,0.063W

7

(A504)

1

2

C8

RDSGAIN1

R48

100,0.063W

8

(A504)

1

2

0.1U,25V

R65

9

(A504)

RBLSGAIN0

1

2

10

+24VA

(A504)

RBLSGAIN1

R50

100,0.063W

11

1

2

R54

(A503)

RDOORS

100,0.063W

12

ITBTS

13

24K,0.1W

(A504)

MPTPS

14

(A504)

R46

OPTPKSL

15

(A505)

1

2

OPTPS

100,0.063W

16

(A505)

24ALIVE

17

R35

1

DEVHPS

18

C106 (A504)

3.3K,0.1W

2

(A504)

MPTPREGS

19

0.01U,50V

CSTPS

20

+3.3VA

(A504)

21

<< Function Check >>

R12

22

OPTPREGS

23

47K,0.063W

(A504)

2 R21 100,0.063W

DUPFANON

24

CP1

R1

(A505)

1

FCT

1

2

1

25

Check Pad

1K,0.063W

J2

IOTR

IOTT

1

Check Pin

LC-2-G-WHT/NOTMNT

<< IOT >>

TCK

2

(A504)

PREGS

+3.3VA

J 1

+3.3VA

JNT3

J110

2

3

+3.3VA

R30

10K,0.063W

IOTR

1

2

J110

1

DA2

DAN217U/NOTMNT

1

2

R32

1K,0.063W

(ASIC-11p)		(ASIC-12p)	(ASIC-13p)	(ASIC-14p)		(ASIC-15p)	(ASIC-16p)	(ASIC-17p)	(ASIC-18p)	(ASIC-19p)	(ASIC-20p)
ADB9	ADB8		ADB7	ADB6	ADB5	ADB4	ADB3		ADB2	ADB1	ADB0

		CP8	CP3	CP4	CP5	CP6	CP7
		1	1	1	1	1	1
100	99	98	97	96	95	94	93	92	91	90	89	88	87	86	85	84	83	82	81

CPU

IC1

26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45

100,0.063W

(A504)

100,0.063W

0,1A

0,1A

1

SUB2TH

MAINTH

SUBTH

TNR4

TNR3

TNR2

TNR1

ASICOFF

(A505)

R215

0.1U,25V

(A505)

(A505)

2

R59	REGIMAR64	C12
		(A506) (A505)	(A503)
RLD REGIMB				(A503) (A503) (A503)

C11

0.1U,25V

	2		1
	1
			N.C.
80	79	78	77

46 47 48 49

	(A503)
	CP12
76
50
ITBLS

+3.3VA

R4

+3.3VA

150,0.1W/NOTMNT

1

2

R3

C3

C13

F

22P,50V

1

2

3.3K,0.1W

1

2

0.1U,25V

1

2

X501

2

R26

1K,0.

IC7

1

2

1

2

1 CD

VDD 5

1

1K,0.063W

C4

C7 12

0.1U,25V

C10

12

C9

0.1U,25V

21

2 VSS

3 MR

VOUT 4

22P,50V

RESET IC

0.

NJU7704F29A-@-#ZZZB

75RESET

74

WAKEENG

(A503)

E

73

R69

CCRT

72

100,0.063W

VCTRLOFF

(A503)

2

1

(A505)

71

FSRD

(A505)

70

R271

33,0.063W

2

WR

(ASIC-21p)

69

R281

33,0.063W

(ASIC-22p)

68

R291

2

33,0.063W

ALE

(ASIC-23p)

67

R195 2

3.3K,01 .063W

ASICRST

(ASIC-26p)

66

PWRSWON

(A505)

65

R7 1

100,02

.063W

FEEDMA

(A504)

64

R199 1

100,02

.063W

FEEDMB

(A504)

63

RSCPR

(A504)

62

RDSCPR

(A504)

61

RSLED

(A504)

60

R8 1

100,02

.063W

FEEDMI0A

(A504)

59

R34

100,0.063W

FEEDMI1A

1

2

(A504)

58

R9

100,0

.063W

FEEDMI0B

1

2

(A504)

57

R221

2 100,0.063W

FEEDMI1B

D

(A504)

56

FDOORS

(A504)

55

R56

100,0.063W

ZEROX

(A505)

54

2

1

REGIMI0A

(A504)

1U,25V/NOTMNT

R25

63W0

53

R63

100,0.063W

REGIMI1A

(A504)

R62

2

1

52

100,0.063W

REGIMI0B

(A504)

R1982

1

REGIMI1B

51

100,0.063W

(A504)

2

			<< CPU >>	C
			1: CPU
	JNT2		2: ASIC
1	J	REGS	3: VIF, LSR, SCN, HVT,TG
			(A504)
2		P80	4: DRIVER PCA, SENSOR

Troubleshooting

CPU/ASIC diagrams Figure 2-10 CPU diagram

J110	3
		+3.3VA
	DA1
	DAN217U/NOTMNT
	1	2
J110	3		R31	IOTT
	4		12
			1K,0.063W
<< M-CPU Writer >>
J111	1	R17		MODE0
		1	2
		1K,0.063W
J111	2	R16		MODE2
		1	2
		1K,0.063W
J111	3	R18		P80
		1	2
		1K,0.063W
J111	4		R19	P81
		1	2
		1K,0.063W
J111	5		R14	TCK
			12
			1K,0.063W

EEPROM

	IC4		+3.3VA
				R530
1		VCC 8		2.7K,0.1W
	A0
2	A1	WP 7	2	C522
3	A2	SCL 6	1	0.1U,25V
4	GND	SDA 5
CHG	R1EX24004ASAS0A

<< TEST PRINT SW >>

SW1

B1 A1

D1 C1

KSHS636AT

+3.3VA

R531

2.7K,0.1W

+3.3VA

R304	10K,0.063W	R305
		P81
	2	1 TESTPRT
	10K,0.063W

	+3.3VA
	R6
(A504)	1	2
		47K,0.063W
	R11
	1	2
		47K,0.063W
R13
JNT1
J 1
2

WAKEVC (A504)

			5: FSR, LVT, DUP , OPT, ENV
MODE0				DEVSL
			6: FSR
MODE2
	+24A: always alive
	+24B: Shutdowned by interlock SW								B
					Stand-by	Sleep	OFF
		+3.3VA			ON	ON	ON
		+3.3VB			ON	OFF	OFF
								1: CPU
									A
								CD1-3

ENWW