Service Test Mode; Conditions For Operation; Requests For Host; Operation Flow - Pioneer AVH-P5200BT Service Manual

1

Service Test Mode

The service test mode is used to check functions in fault diagnosis by a serviceman in case of any defect found in the
DVD mecha.
A
This mode is enabled only when the test mode is activated. At this time, no normal operation is executed.
1. Outline
The service test mode is used to check functions in fault diagnosis by a serviceman in case of any defect found in the
DVD mecha. No general user goes into this mode.
The mode is implemented mainly to check the FE part. It is originally the test mode at the FE part implemented in the
PC communication, which is modified to allow implementation in the HOST communication.
The command for the test mode received in the HOST communication is interpreted by the application part, converted
to the PC communication command and transferred to the OS.
The OS transfers this command to the PC task as if it received the command in the PC communication.
The execution result is noticed to the application part by an e-mail instead of the PC communication.
B
The application part then transmits the result in the HOST communication to display OSD.

2. Conditions for operation

(1) This service test mode is enabled only when the test mode is activated. At this time, no normal operation is executed.
(2) No request from the host is received while the core executes the test mode command.
(3) The core start-up notice is not necessary in the test mode.

3. Requests for HOST

The service test mode requires two items: the item that displays the notice command in the FE test mode in HOST
and the item to display the mecha OSD with no change in the simplified FE test mode.
Displaying the test result only in the mecha OSD, the simplified FE test mode does not require the notice of the test
result to HOST.
C
Therefore, the simplified FE test mode needs to display the video output of the mecha on the monitor.
4. I/F specifications

5. Operation flow

Specification for the UART (HOST) communication
1) Key commands for the test mode
STATUS = 00h, TP = 11h, D0 = EEh, (Key commands for the test mode)
D1: Types of key commands exclusive for the test mode
Value of D1
D
01h
02h
03h
04h
05h
06h
07h
08h
D0h
E
F0h
* In CRG+/-, operation stops when the key is released. At that time, the DVD mecha should make the
key command request (TP = B1h) on a regular basis to prevent any omission of key release.
F
74
1
2
Purpose
Test mode command (1)
Test mode command (2)
Test mode command (3)
Test mode command (4)
Test mode command (5)
Test mode command (6)
Test mode command (7)
Test mode command (8)
Test mode command EJECT
Test mode command NULL
AVH-P5200BT/XNUC
2
3
3
4
4