Self Check And Inspections - Yamaha DG60-112 Service Manual

DG60-112

SELF CHECK AND INSPECTIONS

PREPARATIONS
1.
If no specific frequency is required, set the test frequency at 1 kHz.
2.
Before turning the [POWER] switch on, set the Idling Adjustment Volume (VR201, 1 k ohms) on the MAIN circuit
board at minimum.
3.
Before turning the [POWER] switch on, set all the knobs at the center position.
SELF CHECK MODE
SET-UP: While pressing the SW2 switch on the DM circuit board, turn the [POWER] switch on. The self check mode
program will be started.
0. LED Check
When the DG60-112 enters the self check mode, the LED check is started and the LEDs light automatically as the
check follows the circular sequence below, while pressing the SW2 switch.
all LEDs on all LEDs off
When the SW2 switch on the DM circuit board is released, the check will proceed to the next SW check after all
LEDs light-up and the LED check is finished.
1. SW Check
CHANNEL SELECT SWITCH (A/B)
If the channel select switch is turned on (selected B ch) when a plug is not inserted into the CH SELECT jack
(JK5), A ch LED will light.
CH SELECT (JK5)
When a plug is inserted into the CH SELECT jack (JK5), the channel select function will go out and the A ch
LED will light. Removing the plug will make the A ch LED go out.
REVERB (JK4)
When a plug is inserted into the REVERB jack (JK4), B ch LED will light. Removing the plug will make the B ch
LED go out.
SP MUTE (SW3)
When the SP MUTE switch (SW3) is pressed, both the A ch and B ch LEDs will go out.
When the SW2 switch on the DM circuit board is pressed, the check will proceed to the next Volume check after all
the LEDs light-up and the SW check is finished.
2. Volume Check
This volume check can be tested in the order below from 1 to 18.
1. A ch AMP SELECT
2. A ch GAIN
3. A ch MASTER
4. A ch TREBLE
5. A ch HIGH MID
6. A ch LOW MID
7. A ch BASS
8. A ch PRESENCE
9. A ch REVERB
10. B ch AMP SELECT
11. B ch GAIN
12. B ch MASTER
13. B ch TREBLE
14. B ch HIGH MID
15. B ch LOW MID
16. B ch BASS
17. B ch PRESENCE
18. B ch REVERB
12
A ch LED on B ch LED on
(CN3–1 pin)
(CN3–2 pin)
(CN3–3 pin)
(CN3–4 pin)
(CN3–5 pin)
(CN3–6 pin)
(CN3–7 pin)
(CN3–8 pin)
(CN3–9 pin)
(CN4–1 pin)
(CN4–2 pin)
(CN4–3 pin)
(CN4–4 pin)
(CN4–5 pin)
(CN4–6 pin)
(CN4–7 pin)
(CN4–8 pin)
(CN4–9 pin)
all LEDs off