Sony D-5 - Service Mode (Service Program)

SERVICE MODE (service program)
As shown in Figure 1, the program on this set selects
either service program routine or normal routine after
power supply is connected and a RESET signal
enters. When it enters service program routine, the
microcomputer brings the necessary job from each
subroutine corresponding to the key input, and
executes that job. Operation check can be performed
efficiently using this mode. The operation method
of service mode is explained below.
| D-5/D-50 _D-5/D-50 |
POWER SUPPLY
CONNECTION
Bee ae eg Soa eee, POWER ON RESET
YES
SERVICE MODE
?
NO
OUTPUT PORTS
INITIALIZE
LCD OFF
CLOCK OSC STOP
SERVICE PROGRAM
EXECUTION
(See page 11)
BECAUSE OF
STANDBY MODE.
(CHECK IF ve)
BY IS RELEASED.
RAM CLEAR
Osc ON
TOP
PANEL OPEN?
S902 CHECK
(1c801 €4) )
NO
1S a KE
PRESSED?
$801, 909 CHECK
(1c801 68 )
SWITCH IS ON OR OFF
( CONFIRM IF POWER }
UNDER FRONT PANEL.
IS DEE KEY
PRESSED?
$906 CHECK
(1c801 69) )
MICROCOMPUTER
INITIAL SETTING
Figure 7. Program Flow Chart
MAIN
INTERRUPT
DETECTION
FLAG = 1?
[rer ronsane |
FLAG CLEAR
[er one]
Lara |
BY FOK, GFS
[ears cao |
ool
YES
YES
INTERRUPT
DETECTION
FLAG = 1?
CHECK INTERRUPT
DETECTION FLAG?
NO
DISPLAY DATA
TRANSMISSION
LCD BLANK
RELEASE