Inspecting The Outdoor Unit's Circuit Boards And Power Supply System; Inspecting The Communication Cables - Daikin GYEQ20AN Service Manual

SiAUY361411EA
1.34 Inspecting the Outdoor Unit's Circuit Boards and Power
Supply System
1. With the power breaker OFF, check for any burned or broken circuit boards.
2. Check each circuit board for any broken fuses.
3. If all circuit boards are OK, turn ON the power breaker and check the output voltage.
Power supply circuit board
Main circuit board
Sub circuit board
Main circuit board power supply
Ignition power supply
Sub circuit board power supply

1.35 Inspecting the Communication Cables

Check the connection and continuity of each communication cable.
Parts Inspection
Fuses on circuit boards
Part
Output voltage
Parts to inspect
F1 Power supply R-phase
F2 Power supply S-phase
F3 Power supply T-phase
F4 Ignition power supply
F5 200 V-based load
F101 Main circuit board power supply
F1 Communications with indoor units
F2 Clutch
FU1 200 V-based load
Measuring points
Between CN106-1 and -3
Power
Between CN106-2 and -3
supply
circuit
Between CN106-4 and -5
board
Between CN106-6 and -7
Power
supply
Between CN107-1 and -2
circuit
board
Between CN106-1 and -3
Power
Between CN106-2 and -3
supply
circuit
Between CN106-4 and -5
board
Between CN110-1 and -2
Main circuit board
5
6
CN7
13
14
F1
F2
1
2
Outdoor unit
Terminal block
Inspecting the Outdoor Unit
Purpose
250 V 15 A
250 V 15 A
250 V 15 A
250 V 15 A
250 V5 A
250 V 4 A
250 V 0.5 A
125 V 10 A
250 V 1 A
Measured value
16 V DC
12 V DC
5 V DC
5 V DC
14 V DC
16 V DC
12 V DC
5 V DC
200 V AC
indoor unit
Not used
023470-00E
Capacity
200