7521Plus / N N/B MAINTENANCE
8.1 NO POWER:
Symptom:
When the power button is pressed, nothing happens, no fan activity is heard and power indicatordicator isis notnot lightlight upup..
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| PU2 | 3 |
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| 8 |
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| PF501 |
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| SI4835DY |
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| 7 |
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| ADINP |
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| PL501 |
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| 2 |
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| 6 |
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| PD3 |
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| PJ501 |
| 120Z/100M | 6.5A/32VDC |
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| PR15 | 1 | S | 4 | D | 5 |
| PR9 |
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| PL3 | D/VMAIN | ||||
POWER IN |
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| G |
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| EC31QS04 |
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| PC2 |
| PC509 | PD501 |
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| 470K |
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| 4.7K |
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| 120Z/100M |
| POWER BUTTON | |
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| 0.1U |
| 0.1U |
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| PR14 |
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| SW2 | |
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| RLZ24D |
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| D |
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| PQ5 | G120K |
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| PD4 |
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| POWERBTN# | |||
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| PD1 |
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PWR_VDDIN |
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| EC10QS041M | 2N7002 | S | PR13 |
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| EC31QS04 |
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| R575 | |||
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| C588 | |||||
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| 1M |
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| LEARNING |
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| PD2 |
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| EC10QS041M |
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| U14 | |
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| D |
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| VDD5 |
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| ADEN#_P |
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| H8/3434F | |||||
F2 | 8 |
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| 6 | Q22 |
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| PR16 |
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| PQ12 |
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IN | 5VTAP |
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| G |
| S |
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| D | |||||||||
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| 2 | 1 |
| S |
| D |
| +S5V |
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| 226K |
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| 2N7002 | D |
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R199 | SENSE | OUT |
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7 | F/B | ERR- | 5 | X C247 |
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| G |
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| 38 | |
| 3 | SHUTDN | GND | 4 | R195 | G |
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| 3 |
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| S | G | S | 47 | ||||
VDD5_SW 0 |
| U32 |
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| 10U | 100K |
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| PQ6 |
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| BAT_V | ||
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FROM H8 |
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| Q23 | 3 | VDD5_SW# |
| 2 |
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| 1 | 2 | DTC144WK VDD5S_P |
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| RP7 | |||||||
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| 1 |
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| 3 | DTC144WK | 2 |
| D/VMAIN |
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| PR13 |
| PR7 |
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| 2 | 1 | 1 |
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| PR19 |
| 10K |
| 100K |
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| 1.25V | + |
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| BATT_ALARM |
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| 715K |
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| Q509 | |||||
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| - |
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| PR18 |
| PQ8 | PU2B |
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| 100K |
| PC18 |
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| PR23 |
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| 0.1U |
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| 33K |
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BATTERY IN
PJ4
PF3 | PL1 |
| J1 | J514 |
| 4 | PR21 | |
6.5A/32VDC | 120Z/100M |
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| BATT | 8 |
| 100K | |
6 | BATT | 1 | ||||||
| 7 | |||||||
| PL2 |
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| 6 | 2 |
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PC6 |
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| 5 | 3 |
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120Z/100M |
| PR2 |
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| PU9 |
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0.1U |
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| BAT_V |
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| 301K |
| BAT_V | ||||
| PC1 |
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| SI4435DY | ||||
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| 0.01U | PC5 | PR1 |
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| 0.1U |
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| 100K |
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| 50V |
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CHARGE B’D |
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105
