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Diagnostic Software Descriptions and Troubleshooting
5.9
Test instructions SACD Mono Board
5.9.1
General
•
Impedance of measuring-equipment should be > 1M(.
•
Most tests have to be done by software commands.
Together with the software command you will find a Ref.#
nbr. This is the number of the diagnostic nucleus used for
this test. More detailed information can be found in the
description of the command mode interface.
•
Levels: Most measurements are digital measurements.
The high and low levels in this document got to have next
specification:
low
high
LOW
HIGH
•
All the supply signal_name with "STBY" are present during
standby
•
Because all clocks are derived from the SACD clock
(384FS_in) from the AV board, this board should always be
connected to the mono board.
•
The switching mode power supply (SMPS) output is
switched on/off by the STB_OUT signal from the mono
board to the AV board.
5.9.2
General Start-up Measurements
Supply Check:
Measure the voltages on the pins of the connector 1600 with a
multimeter.
pin
TP
Signal_name Voltage
1600-1
F604
+3V3
1600-2
F604
+3V3
1600-3
F631
+5V
1600-4
F614
+5Vstby
1600-5
F615
+6Vstby
1600-6
F623
GND
1600-7
F623
GND
1600-8
F623
GND
1600-9
F618
-8Vstby
1600-10 F634
STB_CONT
1600-11 F636
+12Vstby
1600-12 F623
GND
1600-13 F675
PWR_FAIL
Also check the following power supplies:
Testpoint F608: +3V3 (5%. (Check IC7605 in case of failure)
Testpoint F632: +3V3 (5%. (Check IC7622 in case of failure)
Testpoint F101: +9V (5%. (Check IC7109 in case of failure)
Check the supply currents to be sure that there are no major
failures on the board.
Measure the currents flowing toward the mono board using a
Tektronix AM503B current probe on the wires between the
switch mode power supply and the connector 1600.
pin
TP
Signal_name measured
1600-1
F605
+3V3
1600-2
F605
+3V3
1600-3
F631
+5V
1600-4
F614
+5Vstby
1600-5
F615
+6Vstby
1600-6
F623
GND
1600-7
F623
GND
1600-8
F623
GND
1600-9
F618
-8Vstby
1600-10 F634
STB_CONT
: < 0.3V (LVTTL)
: > 3.0V (LVTTL)
: < 0.4V (TTL)
: > 4.5V (TTL)
+3V3
+3V3
+5V (0V during standby)
+5V
+6V
+5V (0V during standby)
0V
0V
-5V
0V (+5V during standby)
+12V
0V
+2.1V (1.4V during
standby)
560 mA
510 mA
2 mA
< 1 mA
54 mA
SACD 900
pin
TP
Signal_name measured
1600-11 F636
+12Vstby
1600-12 F623
GND
1600-13 F675
PWR_FAIL
5.9.3
Reset Circuitry
Reset of Sti5505:
In power down mode STB_CONT is high; the clock is disabled
in order to reduce the power consumption. When STB_CONT
goes low, STB_CONTD goes high and enables the 27 MHz
clock.
Check that this clock is present and stable before the RESETn
is de-asserted. RESETn is a signal, which allows initialising the
main processor. We check also that when going from ON mode
to stand-by mode, the 27 MHz is held for a certain moment after
RESETn is asserted.
Reset of Servo:
The reset for the Servo circuit is given on Power On to the
MACE IC 7207 with POR via C2215, R3234 and D6200. The
reset signals STB_DALAS for DALAS and PORN for HD61are
generated by MACE IC.
When POR is not working (due to a hang-up situation), an extra
reset signal RSTN, coming from the Sti5505 will wake up the
Servo circuit.
5.9.4
Clock Check
The source clock comes from the AV board. The SACD CLK is
a master clock from which all the other clocks are derived. If
this one is not present the system cannot start and work.
The SACD power supply, the mono board and the AV board
should be connected together. On power up the clocks appear
on the board. All clocks to be measured have a 0.02%
tolerance.
Clockname
Test point Frequency / level
384Fs_in
F911
SACD_CLK
F903
27M_CLK
F503
PCMCLK_AV F640
MACE CLOCK F211
PM3394B
ch1: freq= 16.9MHz
ch1
1
CH1 1.00 V~
MTB20 0ns
384FS_IN
5.
EN 39
90 mA
16.9344 MHz / 3V3
16.9344 MHz / 5V
27MHz / 5V
12.288MHz / 3V3
8.46 MHz / 3V3
ch1+
CL 06532152_016.eps
051200
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