Keyboard Pa-4A88-C2 Circuit Diagram; Test Mode - Roland HP-335 Service Notes

HP-335
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KEYBOARD PA-4A88-C2 CIRCUIT DIAGRAM

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TEST MODE

Required items
MIDI cable (1.5m or longer Part No.23485229 1.5m)
Computer test cable for SOUND CANVAS SC-88 (Part No.17049906)
Microphone
Oscilloscope
1. To enter the test mode
Get into the FUNCTION MODE from pressing [Function] button after
turning the power On. (Each LED may brink.)
Then press [Function] button while holding down the [Track 2] and
[Play] buttons. 'JIG' is displayed and the piano shall automatically enter
into the TEST MODE.
Press [Function] button to get into stage 2.
* To exit the Test Mode, turn the power Off.
* To proceed on the next mode, press [Function] button. However,
there are some mode that will move to the next item automatically.
Please refer to the explanations written to the each mode.
NOTE : When there is a malfunction during the TEST MODE,
switch the power On again.
2. Display of DEVICE CHECK, ROM VERSION
* DEVICE CHECK
When enter into the TEST MODE, the DEVICE CHECK will be
executed automatically. If there is no malfunction, ROM VERSION is
displayed to the 7-SEG LED.
In the event of a malfunction, one of the following shall be displayed.
7-SEG LED Failed DEVICE
: Program ROM
: Working DRAM
: Wave ROM
: DSP RAM
Press [Function] to go on the TEST MODE.
* BUILD NUMBER
This numbers are displayed for factory purpose only, please
ignore when you execute test mode.
12
Nov. 1998