Technical Manual
Table Of Contents
- Vocoder and Controller Boards Detailed Theory of Operation
- Introduction to This Section
- General
- Vocoder Board
- Controller Board
- Switching Regulator
- RX Signal Path
- TX Signal Path
- Controller Bootstrap and Asynchronous Buses
- Vocoder Bootstrap
- SPI Bus Interface
- Universal Connector and Option Selects
- Keypad and Display Module
- Controls and Control Top Flex
- Controller Memory Map
- Vocoder Memory Map
- MCU System Clock
- DSP System Clock
- Radio Power-Up/ Power-Down Sequence
- Notes
- Secure Modules
- Disassembly/Reassembly Procedures
- Troubleshooting Procedures
- Troubleshooting Charts
- Troubleshooting Waveforms
- Troubleshooting Diagrams
10-10
Chart 8. 01/84 SLIC Initialization Failure
Fail 01/84
SLIC Init Failure
Verify standard
bias per table
Table 3 pertaining
to SLIC.
No
Isolate and
repair problem.
Yes
Standard
bias OK?.
Verify Host/SLIC connections:
Use ohmmeter to electrically
verify following signal
connections to source IC:
Signal @ U702 Source
OE* U701
WE* U701
HD0-HD7 U701
4XECLK U701
HA0-HA4,
HA14_IN, HA15_IN,
HA16,HA17 U701
CSIO1* U701
CSPROG* U701
Synopsis
This failure indicates a failure
in verification of the data in the
SLIC parallel programming
registers Some basic failure
modes:
1) Missing supply or ground to
SLIC.
2) Open in parallel address bus,
data bus or associated select
lines between the host ยตC and
the SLIC.
3) 4xECLK missing to the SLIC.
4) SLIC is faulty.
Verify 4xECLK on SLIC;
nominal 1.8432MHz
square wave, 0-5V.
Connections
good?
Repair
connections.
MAEPF-26021-O
Yes
No
Signals
verfied?
No
Yes
Replace U702.
Replace U701.