Ericsson SH 888 Trouble-Shooting Instruction page 12

Also check the manufacturing week of the circuit board. At the boards manufac-
tured in 1998 week 20-22, l540 (class A, fig. 3.1) is to be replaced. At the boars
manufactured other dates, check the solderings at L540. As soon as the fault is
fixed, send the phone through the normal flow. If the phone starts and the above is
ok, it's probably ok or the fault is intermittent.
3.2 Visual check.
Make an outer visual check.
Make sure the battery screws are intact and tightened, that the isolating sleeve of the
positive battery screw is mounted, that the volume buttons aren't stuck and that the
system connector isn't damaged and dirty.
3.3 Current consumption with On/Off key
pressed.
Insert a dummy battery into the phone, start it up by pressing the On/Off key and
check the current consumption.
• If the phone doesn't consume any current when the On/Off key is pressed, pro-
ceed to section 3.4.5.
• If the phone consumes more than 200mA, remove the IRDA-module and the
golden metal sleeve and try to start the phone again.
* If the consumption is lower, the fault was in the IRDA-module or the
golden sleeve.
* If the consumption still is too high, proceed to section 3.4.3.
• If the phone consumes 1-200mA, starts (asks for SIM, seeks net, etc...) and
works as long as you keep the On/Off key pressed, proceed to section 3.4.4.
• If the phone doesn't start, try to program it in the flash programmer.
* If the phone doesn't start in the flash programmer, proceed to section 3.4.1.
* If the phone doesn't start after programming it or if it is troublesome in the
flash programmer, proceed to section 3.4.2.
* If the phone starts after programming it, then the problem is probably fixed.
To eliminate the risk for intermittent faults make sure the circuit board isn't
liquid damaged and that the solderings at D600 and D610 (fig. 3.1) are ok.
Also check the manufacturing date of the circuit board. L540 (class A, fig.
3.1) is to be replaced at all the circuit boards manufactured in 1998 weeks 20-
22. At the boards made in any other week just check the solderings of L540.
4/00021-2/FEA 209 544/3.D
SH888, S868, Standare Electrical Repair
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