User Guide

6015/6015i/6016i/6019i (RH-55), 6012 (RM-20)

Troubleshooting - RF Nokia Customer Care

IMPORTANT: You must check for both conditions before replacing Alfred. If you have

no LO signal, refer to "UHF Synthesizer Troubleshooting" on page 50. If you have a

significant supply voltage drop on one of the supply pins, then replace Alfred.

Synthesizer Troubleshooting

Faulty synthesizers can cause both RX and TX failures during tuning, in addition to the

VCTCXO tuning. However, it is recommended first to check for the presence of various LO

signals and their proper levels. The 19.2MHz reference clock is needed for the phone to

power up. Therefore, if everything fails, check for the presence of 19.2MHz. The level of

19.2MHz is also important because the UPP is very sensitive and can still pick up a very

weak 19.2MHz clock, which can result in the phone constantly resetting. See "19.2 MHZ

VCTCXO Reference Clock" on page 44 for more information.

The following synthesizers are used in the phone:

• Dual-band UHF:

• 1009.62 MHz for channel 384 in Cell and AMPS with separate LMX2310

PLL IC

• 2088.1MHz for channel 600 in PCS with separate LMX2310 PLL IC

•TX UHF

• 3296.16 MHz ~ 3395.88 MHz for Cell and AMPS with PLL inside Jupiter IC

• 3700 MHz ~ 3819.9 MHz for PCS with PLL inside Jupiter IC

• RX VHF (256.2 MHz for Cell, AMPS, and PCS with PLL inside Batman IC

Incorrect PLL Frequencies

Following are possible causes for incorrect PLL frequencies:

• Incorrect power supplies to the PLL portion

• Control line to the VCO

• Loop filter or resonator components missing or incorrectly installed

• 19.2 MHz reference clock is missing or low

• Component failure (PLL IC, Batman, Jupiter, VCO, or VCTCXO)

Table 8: Alfred Conditions and Supply Currents

Condition: Local Mode, Set

RX Only in RF Main Mode

Supply Current

(From Power Supply)

Good phone 100mA

No UHF LO signal present 254mA

Pin 13 shorted 255mA