CONFIDENTIAL
11 (22)
Customer Care Europe, Middle East & Africa NHL-4u/NHL4/NHL-4j Repairhints
SCCE Training Group 6610/7210/7250 Version 3.0
2003 Nokia Mobile Phones
Date 21/05/2003
© NMP 2003
Checked by:
SCCE Training Group
Approved by:
CC Europe, Middle East & Africa
Phone powers down
Pre-check:
Put a battery in the housing and try to turn on phone.
o If the phone is on and shuts down automatically, follow repair instructions:
“Phone powers down”
o If the battery is loose in housing, follow repair instructions:
“Phone powers down”
Phone powers down
Disassemble the phone and put the PWB into the MJS-38 repair jig. Set power supply for the jig to 4V DC and check
following voltages:
PWRONX = 3.8V DC at UEM side of S302. If there is no voltage; check R305, R306 and C310 for shorts or disconnections
and change faulty component; otherwise check voltage at C202 and L261.
If voltage is ok, probably UEM D200 is faulty and has to be changed.
The voltage decreases (0V) while pressing the S302 button. If not, check the resistance with ohm-meter between
ground side and UEM side of S302:
o button pressed = 0 Ohm
o button not pressed > 350k Ohm
If the resistance does not change when pressing the button, change S302.
Also for “phone powers down” it is risky it the phone looses contact to the battery for a couple of milliseconds; the
phone powers off. By placing the battery gasket (NMP Code 9460594) on the C-cover, the battery will be fixed more
tightly to the housing as shown in picture below *. The battery gasket must be installed to all NHL-4u/4/4j phones
brought to service.
To ensure good contact between battery (BLD-3) and phone, the battery pads on the battery must be cleaned with
isopropyl alcohol and a cotton bud each time the phone is brought to service.
For 6610 see SB-012.
For 7210 see SB-018.
For 7250 see SB-009.
Place for battery gasket
Note: Battery gaskets are delivered in sheets. Ordering one pieces means one sheet, which includes 72 pc of gaskets.
*) The phone in the picture is an NHL-4, but the place for the gasket in NHL-4j/4u is exactly the same as in NHL-4.
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