Protection Circuit Control - Pioneer VSX-AX10 Service Manual

VSX-49TX, VSX-47TX
The reception points on the line:
AM : 1008 kHz
FM : 89 MHz
∗ If this code is issued during auto scanning, it merely causes the
operation to stop. Issue the code again to resume auto scanning.
9. Video converter operation check (Press [7] key)
When this code is issued, All-through mode will be selected.
The video converter operation is deactivated.
The following assignment will be made for component connectors
1 to 3 and D4 connectors 1 and 2.
Component 1 : DVD/LD
Component 2 : TV/DVD
Component 3 : VCR2
D4-1 : SAT
D4-2 : VCR1/DVR
For checkers: Remote control codes other than A55F+A500 ([1]
key) through A509 ([0] key).
4. DSP Microcomputer Test Mode
232C Test Mode
Overview
This test is for checking the operations of the buffer IC in the 232C
block.
Signal supplied to pin 36 of the DSP microcomputer will be output
from pins 35 and 38.
To enter this mode
You may enter 232C test mode using an identification code for serial
transmission.
Identification code: 55h
5. Display Microcomputer Test Mode
1. Test Mode ON
With pin 17 of PD5686 (M38B5) set to 5 V, set pin 10 (RESET)
from 5 V to GND, then back to 5 V. Enter the Test Mode for checker.
2. How to check
Switch the mode using remote control code (k_afunc=A555) from
SR_IN and MR_IN.
1. FL/LED ALL ON
↓
2. FL/LED ALL OFF
↓
3. FLSW OFF
↓
4. FLSW ON
↓
5. MRSW OFF
↓
6. MRSW ON
↓
Returns to 1
142

7.1.2 Protection Circuit Control

Specifications
Microcomputer-related ports
TRANS_DET (pin 87)
Input port : To detect temperature rise at the transformer
Active: "L"
TEMP1 (pin 94)
Input port : To detect temperature rise at the heat sink
Active: "H"
FAN_DET (pin 21)
Input port : To detect forcible fan stop
Active: "H"
OL_DET (pin 73)
Input port : To detect overloading at the amplifier (Interrupt
port)
Active: "H"
DC_DET (pin 49)
Input port : For DC detection
Active: "H"
FAN_DRIVE (pin 86)
Output port : For fan on/off
H"= ON, "L"= OFF
AMUTE (pin 66)
Output port : For system muting on/off
H"= ON, "L"= OFF
EXP_DT2 (pin 58)/EXP_CLK2 (pin 59)/EXP_OE2 (pin 60)/
EXP_ST2 (pin 61)
Output ports : Data on the extension IC for relay control
(IC1103 of the AC PRIMARY assembly).
The protection relays mentioned below include
all the relays within the SP(B) assembly except
RY1001 and RY1002.
The following control processes are activated immediately before
the relay system is turned on upon power-on. The time is 4.8 seconds
after power-on. (Control of the relay system is enabled 5.2 seconds
after power-on.)
Only DC detection is enabled 2 seconds after power-on to activate
it before other protection functions.
(1) Fan control
Valid with European and other general-area models only.
1 Fan on/off
If the temperature at the heat sink rises, the TEMP1 port becomes
"H." Detecting "H," the microcomputer starts the fan. No indication
is made on the FL display.
2 Fan detection
If the fan is forcibly stopped, the FAN_DET port becomes "H."
Detecting "H," the microcomputer performs the following
operations:
1. System muting on
2. Protection relays off
The warning indication "FAN STOP" appears (flashing) on the FL
display.
If this status continues for more than 3 seconds, the power is turned
off (for Standby mode).