Motorola GP88s, Service Manual

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5-2 Test Mode
3.0 Test Mode
3.1 RF Test Mode
When the radio is operating in its normal environment, the radio’s microcontroller controls the RF
channel selection, transmitter key-up, and receiver muting. However, when the unit is on the bench
for testing, alignment or repair, it is removed from its normal environment. It cannot receive
commands from its system and, therefore, the internal microcontroller will not key the transmitter nor
unmute the receiver. This prevents the use of normal tune-up procedures. To solve this problem a
special routine, called TEST MODE or “air test,” has been incorporated in the radio.
To enter test mode:
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Turn the radio on.
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Within ten seconds after the self test is complete, press the side button 2, (SB2) five times in
succession.
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Upon entering test mode, the radio is on carrier squelch mode, 25 kHz channel spacing.
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Each additional press of SB2 will scroll through to the next channel spacing and a
corresponding set of tones will be sounded.
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Pressing SB1 will scroll through and access test environments as shown in Table 5-2.
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Pressing SB2 for 3 seconds will switch the radio to the Control Head Test mode where button
test is activated. Any button pressed will generate tone.
•
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Pressing SB2 for 3 seconds in the Control Head Test mode will cause the radio to return to
the RF Test mode.
NOTE channel number (01 - 14)
Table 5-2 Test Environments
No. of
Beeps
Description Function
1
GKC
Carrier Squelch RX: if carrier detected
TX: mic audio
1
BKC
Tone
Private-Line RX: unsquelch if carrier and tone (192.8Hz) detected
TX: mic audio + tone (192.8Hz)
2
BKC
Digital
Private-Line RX: unsquelch if carrier and digital code (131) detected
TX: mic audio + digital code (131)
3
BKC
Dual-Tone mul-
tiple frequency RX: unsquelch if carrier detected
TX: selected DTMF tone pair
5
BKC
Unsquelch
Open RX: constant unsquelch
TX: mic audio
11
BKC
CMP RX: if carrier detected
TX: mic audio
12
BKC
LLE RX: if carrier detected
TX: mic audio