Marantz SR-66 - SERVICE TEST PROGRAM OF THE MICROPROCESSOR (continued); Microprocessor Pin Functions; CH. MODE Settings; STEP Settings for FM;AM Bands

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rPinNo.[ Symbol [Description SOC~C~S;~S;7;7;7;7;<;
8
Veo
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#5Vpowersuppy.
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EM7001___|
Chipenable
output
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ss
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and LM7001.
Not used |
Chip enable output for TC 9176.
18
SR-66(FR-751)/
|
Input
for
selecting
SR-66(FR-751)
or
FR-731
mode.
:
FR-731 ID According to each mode, data input is as follows.
19
21/22/25
Oo
T. TONE MUTE
A.Vss
NS1/NS2/NS3
SR-66(FR-751)
FR-731
Output for PRO-LOGIC test tone mute.
(At "H", it is active.)
Analog ground.
Control data output for selectings channel in the test tone mode.
Setting are as follows.
| TESTTONE(OFF) | H | A | A |
A: Previous states
23 CH. MODE Port for settings of PRO-LOGIC and 3-STEREO mode.
According to each mode, data output is as follows.
| MODE | _—— OUTPUT
3-STEREO High impedance
PRO-LOGIC
OTHERS
24 MAIN MUTE Output for main mute.{(At "H", it is active.)
26 CENTER MUTE | Output for center mute.(At "H", it is active.)
2/7 SURR. MUTE Output for surround mute.(At "H", it is active.)
28 STEP According to region, input for selecting the frequency band and the steps
of FM and AM.
Settings are as follows.
REGION | FREQUENCY BANDS | STEPS STEP
FM: 87.5 - 108 MHz 100 kHz
AMEND AM: 520 - 1710 kHz 10 kHz
FM: 87.5 - 108 MHz 50 kHz
Connected 0 Voo,
Reference Voltage.(Connected to +5V, Not VDD.)
Ground.
26