Service Can Be Executed With The Ee Picture Displayed; Deck Operation Check - Mitsubishi HS-U748 Service Manual

SERVICE CAN BE EXECUTED WITH THE EE PICTURE DISPLAYED

1. Short-circuit the cathode side of D927 and the GND of the DECK ASSY using the jig shown in Fig. 2.
2. Remove the DECK ASSY.
3. Connect TP5X and TP5Y with a jumper
Note1: Short-circuit the test points before turning on the power.
Note2: Short-circuit the Shield Case and the cathode side of D927 using the jig shown in Fig. 2 before attaching the DECK ASSY.
PCB-MAIN (Component side)

DECK OPERATION CHECK

Check the DECK position and the operation of the Tape Running System, according to the following procedure.
1. Short-circuit TP5T and TP5Y shown in the Fig. 1.
2. Initialize the E PROM.
2
3. Check the operation of the Tape Running System by pressing the FF button, REW button on the PCB-MAIN.
FF button : For forward rotation of the CAPSTAN MOTOR
REW button : For reverse rotation of the CAPSTAN MOTOR
4. Check the DECK position by pressing the CH-UP button, CH-DOWN button on the PCB-MAIN.
CH-UP button
CH-DOWN button : DECK operation in the Unloading direction
Cathode side
of D927
TP5X
TP5T
TP5Y
Fig. 1
: DECK operation in the Loading direction
Jig (Part No. : 859C548O10)
- 37 -
3W 330Ω
Fig. 2