Receiver Troubleshooting; General Instructions For Rx Troubleshooting; Path Of The Received Signal - Nokia RH-21 Series Troubleshooting Manual

RH-21
Troubleshooting
MIDI does not work
Check speaker B180 and the following components: N180, R100, R181, R182, R183,
R184, C183, C180, C184, C181, C182, C179, L180, and L181
• No sound: Try using a known good SALT speaker instead. If there is still
no sound, change the UEM (D200)
• Weak sound: Use the Audio test in Phoenix to set the SALT speaker
parameters (frequency, strength). If it does not affect the sound level,
change the SALT speaker.
Vibra does not work
Check spring connectors and C307 and C308.
• No vibration: Try using a known good vibra instead. If there is still no
vibration, change the UEM (D200)
• Weak vibration: Use the Vibra test in Phoenix to set the vibra's parame-
ters (frequency, duty cycle). If it does not affect the magnitude of the
vibration, change the vibra.
Keyboard does not work
Check that there is no dirt between the dome sheet and the PWB. If the keyboard still
does not operate normally, try to use the Keyboard test in Phoenix to see if the pressed
key is identified. If it is not identified, change the UPP (D400).

Receiver Troubleshooting

General Instructions for RX troubleshooting

Start the Phoenix software and use it to start the required RX mode of the mobile phone.
The troubleshooting flowchart is divided into three steps: (1) general checking, (2) local
checking, and (3) RX-chain checking. Always use an RF cable connected from an external
RF connector to the analyzer via (RF power) attenuator. This is important to protect the
analyzer against excessive RF power and to prevent leakage of undesired RF power into
the cellular frequencies.
1 Start the Phoenix software and select the TX mode under Testing (AMPS, DAMPS,
or TDMA1900).
2 It is useful to select the mid channel (383 for AMPS/DAMPS or 1000 for
TDMA1900) and the power level 2.
Note: Before changing ASICs or filters, all solderings and missing components must be checked visu-
ally. After any possible component changes, the phone must be tuned with the Phoenix autotune SW .

Path of the received signal

Block level description of the receiver:
Page 20
Nokia Corporation Confidential
CCS Technical Documentation
Issue 1 05/2003