Hookswitch Problems; Sometimes Not Possible To Release "Incoming Call; No Voice Dial Possible - Nokia NPE-4 Service Manual

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Hookswitch problems

Sometimes not possible to release "incoming call"

No voice dial possible

When the headset HDC-9P is connected to the botton connector of NPE-4 and a call is coming in, often it is not possible to
release the call by pressing the hookswitch.
Often it is also not possible to initiate the voice call by pressing the hookswitch.
If one of the above mentioned problems occures, the changing of R175 can solve the problem.
Open the BB-shield and measure the resistor R175=100kΩ Ω Ω Ω .
If R175=100kΩ Ω Ω Ω , change the resistor to 15kΩ Ω Ω Ω . (See pictue below).
Note! Up to HW-ID 06.01 there is a 100kΩ Ω Ω Ω resistor. From HW-ID 06.02 the value has changed to 15kΩ Ω Ω Ω .
For more information also see SB 024
© NMP 2002
CONFIDENTIAL
NPE-4 6310/NPL-1 6310i
Date 15.08.2002
100kohm
15kohm
Checked by:
SCCE Training Group
18 (25)
Repairhints
Version 1.0 Approved
Approved by:
SCCE