Nokia 5510 - Page 14

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CMT Troubleshooting PAMS Technical Documentation
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Flash programming doesn’t work
If fault information from Prommer is:
a) MCU doesn’t boot
b) Serial dataline failure
c) Serial clock line failure
Connect R224 (towards N201)
(WDDISX) to GND.
No
Yes
C211 towards N201
(VBB) = 2.8 V
C518 towards C506
(VXO) = 2.8 V
when PWR switch is
pressed.
See section: (2)
See section: "Phone is dead"
No
R308 (PURX) = "1" (2.8V)
after 60ms
Yes
Check C220 (SLEEPCLK)
= 32KHz square wave
Check sleepclock
circuit:
B200, R214,...
Defective N201 CCONT
or overloaded PURX line
No
Yes
Check buffer: V502, R559,...
V502 coll. (RFC)
= 13MHz clock, 700mVpp typ.
Check G502
VCXO 26MHz
Yes
Yes
No
Defective N500
HAGAR
Ok
Defective D300
MAD2 or D301
Flash
Ok
Defective PCB
No
Yes
Check the following lines:
M-BUS: X202 pin 3 -> X201 pin 4 -> V204 pin 5
FBUS_RX: X202 pin 8 -> X201 pin 2 -> V204 pin 3
FBUS_TX: X202 pin 7 -> X201 pin 1 -> V204 pin 1
GND: X202 pin 4 -> X201 pin 3 -> GND
Check also pull-up and -down resistors:
R304, 302, 307
No