Sony PCS-G70N Service Manual page 57

No.21
EC1 (IC1101/CPU-382)
Check the power supply No
Is FB1201/CPU-382
+3.3 V (±10%)?
Yes
No
Check the power supply
Is FB1202/CPU-382
+1.2 V (±10%)?
Yes
No
Check the clock
Is pin 4 of IC502/CPU-382
25 MHz?
Yes
No
Are other SH bus devices
/CPU-382 OK?
Yes
Check the
IC1101/CPU-382,
or the peripheral circuit.
PCS-G70N/G70NP/G70NP2
PCS-G70S/G70SP
Check the
IC302/PS-686,
or the peripheral circuit.
Check the
IC2402/CPU-382,
or the peripheral circuit.
Check the IC501, IC502,
X501/CPU-382,
or the peripheral circuit.
Check the followings
. Bus buffers
(IC2209-IC2216/CPU-382),
or the peripheral circuit
. IC302, IC402/CPU-382,
or the peripheral circuit
No.22
EC2 (IC1102/CPU-382)
No
Check the power supply
Is FB1203/CPU-382
+3.3 V (±10%)?
Yes
No
Check the power supply
Is FB1204/CPU-382
+1.2 V (±10%)?
Yes
No
Check the clock
Is pin 6 of IC502/CPU-382
25 MHz?
Yes
No
Are other SH bus devices
/CPU-382 OK?
Yes
Check the
IC1102/CPU-382,
or the peripheral circuit.
Check the
IC302/PS-686,
or the peripheral circuit.
Check the
IC2402/CPU-382,
or the peripheral circuit.
Check the IC501, IC502,
X501/CPU-382,
or the peripheral circuit.
Check the followings
. Bus buffers
(IC2209-IC2216/CPU-382),
or the peripheral circuit
. IC302, IC402/CPU-382,
or the peripheral circuit
4-19 (E)