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Maxon SP200/210 Radio SP200/210
TROUBLESHOOTING Issue 1.0
Page 6-2 03/01
6.2 Troubleshooting Chart
Symptoms Causes Remedy
Radio does not work 1. Battery is discharged
(below 6V =/-10%)
2. Fuse blown
3. 5V supply missing
1. Replace battery
2. Replace Fuse
3. Check IC5 (5V +/-0.2V)
Warning Tone and
radio does not work
1. PLL error
2. EEPROM failure
3. Low battery
1. Check TCXO/VCO/PLL IC
freqs programmed
2. Re-program
3. Replace, or charge, battery
Poor Rx sensitivity
(-10 to –60dBm)
1. Defective Antenna switch
2. Defective front-end
3. Defective mixer
4. IF IC
5. VCO output level
6. LO frequency
1. Check D5 & D6
2. Check front end
3. Check D9, T1 & T2
4. Check X1, CF1/CF2 & IC5
5. Check Rx VCO level >+1.2dBm
6. Retune TCXO
Defective Rx 1. VCO frequency change or drop
in level
2. Defective voltage source
1. Repair VCO
Defective IF IC (IC1)
2. Check IC1
PLL Error 1. Defective 12.8MHz TCXO
2. Voltage source for Rx VCO / Tx
VCO
3. Defective PLL
1. Replace TCXO
2. Check Rx VCO / Tx VCO
3. Replace IC2. Check DC/DC
converter
Low / No Tx power 1. Tx Amp 1. Check Q9, IC9 & power control
loop
No modulation 1. Audio ASIC 1. Check IC406
No programming 1. Defective programming lead
2. Check accessories connector.
Table 6-2 – Troubleshooting chart