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(*1) Refer to Clock adjustment after crystal replacement (P.19) .

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(*1) Check parts for misalignment, blow-out, or total loss.

Confirmation of the parts inside RF Signal Route (P.8) shield box is impossible and therefore unnecessary. 

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This chapter explains the measuring equipment, the JIG connection, and the PC setting method necessary for the measurement in 
 Troubleshooting Guide (P.10)

• Digital multi-meter (DMM): it must be able to measure voltage and current.
• Oscilloscope.
• Frequency counter: It must be precise enough to measure intervals of 1 Hz (precision; ±4 ppm)

Hewlett Packard, 53131A is recommended.
(If you are already using a frequency counter with your cell station or portable cell station, you do not need to replace it.) 

<Preparation>

• Serial JIG cable: PQZZ1CD300E*
• Maintenance software for PC (PSZZ3TD7896M) PC which

runs in DOS mode

*: If you have the JIG Cable for TCD500 series
(PQZZ1CD505E), change the following values of
resistance. Then you can use it as a JIG Cable for both
TCD300 and TCD500 series. (It is an upper compatible JIG
Cable.)

 Connect the AC adaptor.

 Connect the JIG Cable GND (black).

 Connect the JIG Cable RX (red) and TX (yellow).

*: COM port names may vary depending on what your PC calls it.

Resistor

Old value (k

) New value (k)

R2

22

3.3

R3

22

3.3

R4

22

4.7

R7

4.7

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