Service Modes, Error Codes, and Fault Finding
EN 20 JL2.1E AA5.
Figure 5-3 “Off” to “Semi Stand-by” flowchart (part 1)
F_15710_152a.eps
200905
All I/O lines have a “high” default state:
- Assert the Viper reset.
- Sound-Enable and Reset-Audio should remain “high”.
- NVM power line is “high”, no NVM communication possible.
Off
Standby Supply starts running.
+5V2, 1V2Stb, 3V3Stb and +2V5D become present.
In case of PDP 3V3 Vpr to CPU PDP becomes present.
St-by µP resets
Initialise I/O pins of the st-by µP, start keyboard scanning, RC
detection, P50 decoding. Wake up reasons are “off”.
action holder: MIPS
autonomous action
action holder: St-by
Stand by or
Protection
Mains is applied
- Switch Sound-Enable & Reset-Audio “high”.
They are “low” in the standby mode if the
standby mode lasted longer than 2s.
The availability of the supplies is checked through “detect” signals (delivered by
dedicated detect-IC's) going to the st-by µP. These signals are available for
+12V, +8V6, +5V, +1V2 and +2V5. A “low” to “high” transition of the signals should
occur within a certain time after toggling the standby line. If an observer is
detected before the time-out elapses, of course, the process should continue in
order to minimize start up time.
Wait 50ms and then start polling the detect-
5V, detect-8V6 and detect-12V every 40ms.
Enable the DC/DC converter for +1.2V.
+1.2V error
Detect-1V2
received within
250ms?
No
Activate +5V supply detection algorithm.
Start polling the detect-1V2 every 40ms
+5V, Vtun, +8V6, +12VSW, +5V2S, Vsound
and +12/24V are switched “on”.
Switch Main Supply to “on” by switching “low” the
ON-MODE and the POD-MODE I/O lines.
If the protection state was left by short circuiting the
SDM pins, detection of a protection condition during
startup will stall the startup. Protection conditions in a
playing set will be ignored. The protection mode will
not be entered.
Detect-5V
received within
300 ms after POD-MODE
toggle?
No
Yes +5V error
SP
Switch “low” the NVM power reset line. Add a 2ms delay before
trying to address the NVM to allow correct NVM initialization.
+12V error
Detect-12V received within
2000 ms after POD-mode
toggle?
No
SP
Activate +12V supply
detection algorithm
Yes
+8V6 error
Detect-8V6 received
within 2000 ms after POD-mode toggle?
Startup shall not wait for this detection
and continue startup.
No
No need to wait for the 8V6 detection at this point.
activate +8V6 supply
detection algorithm
Yes
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