S2B Bus; Peripherals; Audio Clock Select; Slow Blanking - Marantz SA12 Service Manual

S2B bus

The S2B is the interface between the digital part and the front
end. This bus links the STi5505 and the MACE2. The S2B
echo command permits to check the communication
between those devices.
Ref.# Command Name Remark
601 S2b Echo

Peripherals

Audio clock select

This clock is derived from the SACD CLOCK by the mono
board system clocks. The audio PCM_CLK can take 3
values. The Sti5505 PIO's permit to select 3 different
frequencies depending on the application. Check those
frequencies on F566
Ref.# Command Frequency SEL_AC
Name
1400 Clock 11.2896
11.289 MHz MHz
1401 Clock 12.288
12.288 MHz MHz
1402 Clock 24.576
24.576 MHz MHz
PM3394B
ch1: freq= 11.4MHz
ch1
1
CH1 1.00 V~ MTB50.0ns
PCM clk 11,298MHz
PM3394B
ch1: freq= 12.3MHz
ch1
1
CH1 1.00 V~ MTB50.0ns
PCM clk 12.288MHz
Write and read back
SEL_AC
LK2 LK1
0 1
1 0
1 1
ch1+
CL 06532152_022.eps
051200
ch1+
CL 06532152_023.eps
051200
PM3394B
ch1: freq= 24.6MHz
ch1
1
CH1 1.00 V~
PCM clk 24.576MHz
Audio mute
Ref.# Command
Name
109 Mute ON
110 Mute OFF
Center on/Mono
Check whether we can switch between the mono mode and
the stereo mode. Measure the level on F633.
Ref.# Command Name
113 Centre-On-Stereo Pin On
114 Centre-On-Stereo Pin Off
I2C DAC
Check whether you can enable or disable the I2C switch.
When driving the I2C_DAC signal measure the
corresponding level at F001.
Ref.# Command Name
1301 I2C enable
1302 I2C disable

Slow blanking

An additional part of the video-path is the scart-switching or
slow blanking voltage.
This voltage can be 0V, 6V. Check at F620 the output voltage
with next commands:
Ref.# Command Name
1410 Scart Low
1411 Scart Medium
PCM Audio on I2S bus
For this test connect the A/V board and the front panel to the
monoboard. Don't forget to power up the front panel. The I2S
audio signals are measured in 3 different situations: no
audio, sine wave is played, pink noise is played.
No audio
Switch ON the power supplies and check these signals
Signal
SCLK_AV
LRCLK_AV
PCM_CLK_AV
PCMOUT_AV
27
MTB50.0ns ch1+
CL 06532152_024.eps
MUTE_AV at F625 Remark
+4.8V Audio Mute On
-8V Audio Mute Off
Center on Remark
3.3V
0V
level
H = 5V
L = 0V
Remark Level
No picture 0V ± 0.5V
16/9 format 6V ± 10%
Test type Level Frequency
point
F637 Clock LVTTL 2.82MHz
< 0.02%
F641 Clock LVTTL 44.1KHz
< 0.02%
F640 No signal LVTTL N/A
F638 No signal LVTTL N/A
051200
Mono
Stereo