TM
11-5835-243-34/EE641-AA-MMI-010/E154
MTT/TO
31S3-4-110-1
Section Ill. TROUBLESHOOTING
through A5. Use the circuit card schematic
3-7. Introduction
diagrams, signal interconnecting list, and in-
This section contains the direct support fault
terconnecting wiring diagrams, figures FO-2
isolation procedures required to identify and correct
through FO-11 for signal tracing. In addition,
a tape transport or magnetic tape cartridge
selected waveforms and timing information is
malfunction. Fault isolation by direct support
illustrated in figures 2-4 and 2-5. Table 3-3 lists
maintenance personnel is based on a series of
operating voltages for the power amplifier circuit
functional tests using the Magnetic Tape Transport
card assembly A9.
Test Set TS-4002/UYH-5 (hereafter called the
exerciser). Some of the tests also use the Magnetic
3-9. Tape Transport Test Setup
Tape Test Cartridge TW-433/UYH-5 (hereafter
a. Connect tape transport to exerciser shown in
called the skew tape cartridge), while others require
only a standard tape cartridge.
b. Install a standard tape cartridge in the tape
3-8. Fault Isolation
transport and lock in place. Be sure write protect
detent is not in PROT position.
Isolation to a replaceable component is ac-
c. Refer to TM 11-6625-3024-14 for exerciser
complished by using the troubleshooting charts
operating instructions. Set exerciser controls as
follows:
procedures located in paragraphs 3-9 through 3-19.
POWER ON/OFF
These tests are arranged in a logical order of func-
SYSTEM
On
tions and must be performed in the sequence in
Depress PROCESSOR
Verify STOP indi-
which they appear. If the tape transport or cartridge
RESET
cater is ON.
fails a test, stop testing immediately and refer to the
(located on connector
If not, depress
appropriate troubleshooting chart for the repair
panel)
RESET again.
procedure. When the repair has been accomplished,
SELECT 1
On
repeat the entire test to verify the repair. In some
POWER ON/OFF
On
cases it may be necessary to trace signals with an
TRANSPORT
oscilloscope or multimeter in order to isolate a fault.
An extender card is provided in the IL Accessories
Set for accessing the test points on circuit cards Al
3-2
