HP LaserJet Pro 300 Service Manual - Page 141

7 6 Figure 2-11 ASIC diagram (A501) (A501) (A501) (A501) (A501) (A501) (A501) (A501) (A501) (A501) (A501) (A501) (A501) (A501) (A501) (A501) (A505) DUPSWBKCL R36 3.3K,0.063W 2 C86 0.1U,25V 0.1U,25V 0.1U,25V C118 12 12 12 ASICRST C111 33,0.063W 1 2 33,0.063W 1 2 33,0.063W 1 2 33,0.063W 1 2 33,0.063W 1 2 33,0.063W R91 R92 R93 R94 R95 R96 R97 R88 R89 R90 ADB9 ADB8 ADB7 ADB6 ADB5 ADB4 ADB3 ADB2 ADB1 ADB0 WR RD ALE 1 2 33,0.063W 1 2 33,0.063W 1 2 33,0.063W 1 2 33,0.063W 1 2 PLLENBL R123 2 1 20K,0.063W ASICCLK 12 C79 12 R127 2 1 0.01U,50V 75,0.063W C117 0.1U,25V 12 12 1 +3.3VB NF3 1 FB 2 OVDD HOVDD C87 0.1U,25V C110 0.1U,25V NF1 1 FB 2 OGND HOGND R239 2 NF4 1 FB 10K,0.063W R240 2 10K,0.063W NF2 1 FB 2 VSS 1 1 2 VDD 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 CP2 27 check 1 28 29 30 31 32 C85 0.1U,25V 33 34 (A505) DUPSWBKSL R74 2 1 35 DUPFANLK 3.3K,0.063W 36 (A505) 37 (A503) ICLBSNS 38 ICLRSNS 39 (A503) TR2S 40 (A503) TR1S 41 (A503) ENVHUM 42 (A505) ENVTEMP 43 (A505) RDSDR 44 (A504) RDSSRA 45 (A504) RSSRA 46 (A504) 47 C109 1U,10V 48 21 (A504) DRMMFG 49 (A504) DRMMDEC R129 100,0.063W 2 1 50 (A504) DRMMACC R128 2 100,0.063W 1 51 (A505) PSREM24V R79 2 390,0.063W 1 52 (A504) DEVMFG 53 (A504) DEVMDEC R211 2 1 100,0.063W 54 (A504) DEVMACC R125 2 1100,0.063W 55 (A504) MPTPKSL R139 2 31.3K,0.063W 56 (A504) FSRMREV R121 2 1100,0.063W 57 58 (A504) (A504) (A504) (A504) FSRMACC FSRMDEC FSRMFG MFANPWM R115 2 R116 2 R212 2 1100,0.063W 1 100,0.063W 1100,0.063W C83 0.1U,25V 59 60 61 62 63 1 check CP9 64 21 21 C76 0.1U,25V C77 0.1U,25V 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 12 12 IC2 C101 0.1U,25V C80 12 0.1U,25V 12 C75 0.1U,25V 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 99 98 97 CP11 1 check CP10 1 check R73 1 2 100,0.1W R82 2 1 100,0.063W R84 1 2 100,0.063W R76 1 2 100,0.063W R38 1 2 220,0.063W R86 1 2 220,0.063W R39 1 2 100,0.1W R83 1 2 100,0.063W 2 1 R78 100,0.063W R77 1 2 100,0.063W R75 1 2 100,0.063W R87 1 2 220,0.063W R85 1 2 220,0.063W R81 1 2 100,0.063W SCNACC SCNDEC TR2CLK TR2PWM TNRRSCLK HVOUTEN HVDALD HVDATA1 HVDACLK TGEN4 TGEN3 TGEN2 TGEN1 TGRD TGSD R106 1 R105 1 R104 1 R103 1 R102 1 R101 1 R100 1 R108 1 2 100,0.063W 2 100,0.063W 100,0.063W 2 12 00,0.063W 2100,0.063W 2100,0.063W 2 100,0.063W 2 100,0.063W LDCTRL41 LDCTRL40 LDCTRL30 LDCTRL31 LDCTRL20 LDCTRL21 LDCTRL11 LDCTRL10 BDI 12 12 (A503) (A503) (A503) (A503) (A503) (A503) (A503) (A503) (A503) (A503) (A503) (A503) (A503) (A503) (A503) (A503) (A503) (A503) (A503) (A503) (A503) (A503) (A503) (A503) 12 5 4 3 2 C81 0.1U,25V R71 C82 1 2 12.1K,0.1W 0.1U,25V R113 1 R20 R132 18K,0.1W R133 R47 1 R40 1 1 1 2 2 100,0.063W R112 1 2 100,0.063W 1 1 R164 11K,0.1W 1 C92 21 0.01U,50V 2 100,0.063W 3.3K,0.063W 2 2 3.3K,0.063W 2 3.3K,0.063W 2 VDO1O VDO1O VDO1 VDO1 VDO2 VDO2 VDO3 VDO3 VDO4 VDO4 LOOPS TOP BDO SCLK SCI SCO DEVSL CSTPKSL MFANLK MPTCLCH (A503) (A503) (A503) (A503) (A503) (A503) (A503) (A503) (A503) (A503) (A505) (A503) (A503) (A503) (A503) (A503) (A505) (A505) (A505) (A505) 2: ASIC A CD1-4 F E D C B ENWW Tools for troubleshooting 117