HTX-212 Two-Meter Mobile Transceiver
(190-1125)                 Troubleshooting            Faxback Doc. # 19437

ERROR CODES

Your HTX-212 has the following three built-in error codes.

tF Err - appears if you try to transmit outside the allowed range (see
         "Extending the Transmit Frequency Range," Faxback Doc.#     ,
         Basic Operation.

PL Err - appears if the HTX-212's PLL (phase-locked loop) section
         malfunctions. If turning the HTX-212 off then back on does not
         correct this error, take it to your local Radio Shack store to
         arrange for service.

EEP Err - appears if the HTX-212's EEPROM checksum fails.  Try resetting
          the HTX-212 (see "Resetting the HTX-212," Faxback Doc.#     ,
          Basic Operation.

COMMON PROBLEMS AND SOLUTIONS

If your HTX-212 does not seem to be operating properly, check this section
for a possible solution.

┌───────────────────────┬─────────────────────────────────────────────────┐
│PROBLEM                │   POSSIBLE SOLUTIONS                            │ 
├───────────────────────┼─────────────────────────────────────────────────┤
│Signal strength meter  │   Be sure DTMF is not on the display.  If it is,│
│shows a signal and     │   press DTMF to turn off DTMF page.             │
│BUSY appears, but no   │                                                 │
│sound from speaker.    │   Be sure T-SQL is not on the display.  If it   │
│                       │   is, press T-SQL until neither T nor T-SQL     │
│                       │   appears.                                      │
│                       │                                                 │
│                       │   Be sure VOLUME and SQUELCH are properly       │
│                       │   adjusted.                                     │
│                       │                                                 │
│                       │   Be sure nothing is plugged into the EXT.      │
│                       │   SP jack.                                      │
├───────────────────────┼─────────────────────────────────────────────────┤
│No controls operate.   │   Be sure LOCK is not on the display.  If it is,│
│                       │   press F then LOCK to unlock the controls.     │
│                       │                                                 │
│                       │   Be sure LOCK on the microphone is set to its  │
│                       │   leftmost position.                            │ 
├───────────────────────┼─────────────────────────────────────────────────┤
│Other party cannot     │   Be sure the duplex offset is set correctly.   │
│hear your transmis-    │                                                 │
│sions.                 │   Set the output power to high by pressing      │
│                       │   LOW so HIGH appears on the display.           │
├───────────────────────┼─────────────────────────────────────────────────┤
│The display does not   │   Check the power connections.                  │
│light when you press   │                                                 │
│POWER.                 │   Check the fuse (see "Replacing the Fuse,"     │
│                       │   below.                                        │
└───────────────────────┴─────────────────────────────────────────────────┘

REPLACING THE FUSE

Your HTX-212 (and vehicle) are protected by a 15-amp fuse in the HTX-212's
positive (red) power wire.  If the HTX-212 does not turn on, even when
you are sure the power wire is properly connected to a 12V DC power source,
check the fuse and replace it, if necessary.

1.  Snap open the in-line fuse holder.

2.  Remove the fuse from the holder, and slide the fuse out of the end
    connectors.

3.  If the fuse's filament is no longer intact, replace the fuse with a
    15-amp 1 1/4 x 1/4-inch fuse (Cat. No. 270-1073).

    CAUTION:  Use only a fuse of the recommended size and type.  Using
              another type fuse, or defeating the fuse protection, could
              damage your vehicle or your HTX-212.  If the fuse frequently
              blows, there is a problem with the HTX-212 or its wiring. 
              Have that problem fixed as soon as possible.

4.  Replace the fuse in the holder and snap it closed.


(CS 2/22/96)