http://servis-manual.com/6 ADJUSTMENTS (HANDSET)TOP PREVIOUS NEXTIf your unit have below symptoms, adjust each item using remedy column from the table.Unit condltion:1. Remove the antenna lead wire from P.C.Board ofhandset.2. Power Supply: DC 2.6V3. Volume: HIGH (When P.C. Borad of handset is in test mode, volume condition is medium.Press "LOUD" key once.)4. Speaker Load: 150ΩHow to set the test mode.CH25 Test ModeSymptom RemedyThe movement of Battery Low Indicator is wrong. Make confirmation in item (A)The base unit does not respond to a call from handset. Make adjustment in item (B)The base unit does not transmit or the transmit frequency is off. Make adjustment in item (C)The transmit frequency is off. Make confirmation in item (D)The transmit power output is low, and the operating distancebetween base unit and handset is less than normal. Make confirmation in item (E)The reception sensitivity of base unit is low with noise. Make adjustment in item (F)Does not link between base unit and handset. Make confirmation in item(G)The reception level is high or low. Make adjustment in item (H)The transmit level is high or low. Make adjustment in item (I)CH TX Frequency RX FrequencyCH25 49.970MHz 46.970MHz