BK Radio GPH-CMD Service Manual

Maintenance GPH-CMD VHF Radio
Page 5-16 BK RADIO
5.6 TROUBLESHOOTING (cont.)
Transmitter Audio Modulation Is Too High -Transmit Analog or Digital Deviation
misadjusted
-VCO modulation circuit failing
Audio Output Power Does Not Meet
Specification
-Audio power amplifier failing
-FM demodulator IC failing
Radio Always Gives Low Battery Indication
("LOBATT" Message Displayed)
-Failing or shorted 8.2 volt regulator
Radio Will Not Function Properly At Band
Edges
-VCO tuning voltage (T1) misadjusted
-Shorted or open HI BAND signal to synthesizer
loop amplifier
Transmitter Frequency Out Of ±2.5 PPM
Specification
-XTAL frequency misadjusted
-Failing temperature compensation circuit on
Systems board
-Failing XTAL
Audio Opening Without Receiving The
Programmed Code Guard
-Monitor switch failing
-Monitor switch buffer (Q8 on Systems board)
failing
Insufficient Transmit Range -Improper or defective antenna
-Open antenna jack
-Failing antenna match circuit
ANI or DTMF Tones Not Being Transmitted -Radio not programmed for ANI or DTMF
Transmitted Digital Code Guard Will Not
Unsquelch Other Radios
-DCG not programmed or not set for proper
polarity
Will Not Enter Keyboard Programming
Mode
-Improper password being entered
-Open or shorted -PROGRAM signal

BK Radio GPH-CMD Specifications

General

Brand	BK Radio
Model	GPH-CMD
Category	Portable Radio
Language	English