Avtech AVM317A User manual

AV TECH CORPORATION
AVM317A Maintenance Manual
V0.1
2014.05.15

Apparatus: Multimeter
A. Check if the power of the main board is abnormal.
Step1: Measure if the components of AM317AM, PQ1 S-pin and D-Pin, is 5V.
State: Yes, go to step 2.
No, change the component PQ1.
Step2: Measure the both ends of the component D2 of AM317AM is 5V.
State: Yes, go to step 3.
No, change the component D2. Please send it back to RMA if the voltage isn’t 5V
after changing.

Step3: Measure the component U12 Pin1 of AM317BM if the voltage is 5V.
State: Yes, go to step4.
No, change the component U12. Please send it back to RMA if the voltage isn’t 5V
after changing.
Step4: Measure the component U11 Pin7 of AM317AM if the voltage is 3.8V.
State: Yes, go to step5.
No, change the component U11. Please send it back to RMA if the voltage isn’t
3.8V after changing.

Step5: Measure the both ends of the component L2 of AM317AM if the voltage is 3.8V.
State: Yes, go to step6.
No, change the component L2. Please send it back to RMA if the voltage isn’t 3.8V
after changing.
Step6: Measure the component U20 Pin1 of AM317AM if the voltage is 1.8V.
State: Yes, go to step7.
No, change the component U20. Please sent it back to RMA if the voltage isn’t
1.8V after changing.

Step7: Measure the component IC1 Pin2 of AM317BM if the voltage is 3.3V.
State: Yes, go to step8.
No, change the component IC1. Please sent it back to RMA if the voltage isn’t
3.3V after changing.
Step8: Measure the component U13 Pin3 of AM317BM if the voltage is 1V.
State: Yes, go to step9.
No, change the component U13. Please send it back to RMA if the voltage isn’t 1V
after changing.

B. Video Loss
Step1: Measure the component U2 Pin5 of AM317BS if the voltage is 1.2.
State: Yes, go to step2.
No, change the component U2. Please sent it back to RMA if the voltage isn’t
1.2V after changing.
Step2: Measure the component U3 Pin5 of AM317BS if the voltage is 2.7V.
State: Yes, go to step3.
No, change the component U3. Please send it back to RMA if the voltage isn’t
2.7V after changing.
Step3: Measure the component U4 Pin5 of AM317BS if the voltage is 1.8V.
State: Yes, go to step3.
No, change the component U4. Please send it back to RMA if the voltage isn’t
1.8V after changing.

Part Number of the Components:
Main board
Location Part Number Part Name
PQ1 PQAM2321PSO2
3
PAM2321P-T1-PF(SOT23)
D2 PDSCD34HSC-0
0
PSCD34H(SMA)
U12 PUAT120CD-110 PAT120CD-2.9KDR(SOT23)
U11 PUAT1526P1220 PAT1526P11U(SOP8)
L2 PL2U2/3020-0S PCHOKE 2.2uH SMD(3020)<O173>
U20 PUS1131B18150 PS-1131B18UA-N4DTFG(SOT-89)
IC1 PUTJ3940S-5A0 PTJ3940S-3.3V(SOT223)
U13 PUG5725ADJ120 PG5725ADJT11U(SOT23-5)
Sensor board
Location Part Number Part Name
U2 PUAT5231120C0 PAT5231-1.2KE(SOT25) 1.2V
U3 PUAT5231270C0 PAT5231-2.7KER(SOT25) 2.7V
U4 PUS1131B18150 PS-1131B18UA-N4DTFG(SOT-89)