Service manual

2-6 June 21,2004

DECODER NP88 FLEX

Troubleshooting

If the pager failed the paging sensitivity check but passed the 10 dB rise measure-

ment, and th e receiver circuits have the required data output level, the fault is

probably in the decoder circuits.

The following table (Table 2-1) provides a quick, preliminary check of possible

problem areas. However, refer to the troubleshooting charts in the following

paragraphs and the diagnostic waveforms on the schematic diagram in the appro-

priate supplement for a complete guide to troubleshooting the decoder board.

Table 2-1. Preliminary Decoder Troubleshooting

Malfunction Probable Cause

Pager does not turn on 1. Battery voltage low or incorrect polarity

2. VCC voltage incorrect

No display or partially active display 1. Broken LCD

2. Damaged display contacts

No page/inactive data port 1. Receiver section

2. Receiver board socket